CN114631651A

CN114631651A - Battery protection circuit, battery pack and electron cigarette

Info

Publication number: CN114631651A
Application number: CN202210334868.XA
Authority: CN
Inventors: 宋朋亮; 宋利军
Original assignee: Xi'an Wenxian Semiconductor Technology Co ltd
Current assignee: Xi'an Wenxian Semiconductor Technology Co ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2022-06-17

Abstract

The application provides a be applied to battery protection circuit of electron cigarette, including battery protection module and second switch unit, battery protection module still includes second grade and crosses and inhale protection unit and load detection unit, second grade cross inhale protection unit respectively with load detection unit logic control unit electricity is connected, load detection unit is used for obtaining first detection voltage, first detection voltage is arranged in the main loop that discharges at second switch unit place and corresponds, works as second grade crosses and inhales the protection unit basis first detection voltage judges when the electric current in the main loop that discharges is greater than first current threshold value, logic control unit begins timing, works as logic control unit timing length of time is greater than or equal to the second and predetermines the length of time, logic control unit control the second switch unit keeps the disconnection. The application also provides a battery pack and an electronic cigarette.

Description

Battery protection circuit, battery pack and electron cigarette

Technical Field

The application relates to the technical field of electronic cigarettes, in particular to a battery protection circuit, a battery pack and an electronic cigarette.

Background

The existing electronic cigarette comprises a battery and an atomization component. Referring to fig. 1, the atomizing assembly is electrically connected to a battery, the battery is used for providing electric energy to the atomizing assembly, the atomizing assembly generally includes a system control module, an atomizing core, a first switch unit 910, an airflow sensor 940, and the like, the system control module is correspondingly electrically connected to the battery through a battery terminal BAT1 and a ground terminal GND1, the atomizing core includes a heater 950, the heater 950 is electrically connected to the battery through the first switch unit 910, the first switch unit 910 and the airflow sensor 940 are respectively electrically connected to the system control module, the heater 950 is used for heating the tobacco tar to generate smoke through atomization, and the airflow sensor 940 is used for detecting whether airflow flows, for example, airflow flows in an electronic cigarette when a user smokes.

When the system control module detects that airflow flows through the airflow sensor 940, the system control module controls the first switch unit 910 to be opened and conducted, so that a loop formed by the heating wire 950 and the battery is conducted, the heating wire 950 generates heat to heat tobacco tar to generate smoke, the smoke is conveyed into the mouth of a user through a suction nozzle of the electronic cigarette, a smoking effect is achieved, when the system control module detects that the user stops smoking through the airflow sensor 940, the system control module controls the first switch unit 910 to be disconnected and cut off, the heating wire 950 is disconnected from the loop formed by the battery, and the heating wire 950 stops heating.

When the time length of a single smoking of a user is long (over-smoking), for example, over 15s and 20s, the airflow sensor 940 is always triggered during smoking, or the airflow sensor 940 is triggered by mistake for a long time during logistics transportation (over-smoking), so that the operating time of the first switch unit 910 is too long, the temperature of the first switch unit 910 is too high, the maximum operating temperature of the device may be exceeded, for example, 150 ℃, the life or reliability of the first switch unit 910 is reduced, the first switch unit 910 is seriously damaged by short circuit, and the damage or temperature increase of the first switch unit 910 causes a chain reaction, for example, damage to a system control module around the first switch unit 910.

In order to solve the problem of long-time operation of the first switch unit 910, a current solution is that the system control module controls the trigger time of the airflow sensor 940, and when the trigger time of the airflow sensor 940 exceeds a preset time, for example, the preset time is 5s or 10s, the system control module forcibly controls the first switch unit 910 to stop operating even if the airflow sensor 940 detects that airflow is triggered, which is beneficial to protecting the first switch unit 910 and its peripheral circuits. There is also a system control module scheme in the prior art, and the system control module scheme has an over-temperature protection function inside.

Disclosure of Invention

However, the inventors of the present application have found through long-term studies that: the over-suction protection mechanism may be damaged and fail with a certain probability, or there may be situations other than the over-suction mechanism: for example, the air flow detection is repeatedly and mistakenly triggered at short intervals, and the triggering time length of the air flow sensor each time is shorter than the internal preset time length; or the first switch unit always works due to the abnormity of the system control module; or the first switching unit breaks the short circuit. The original mode of controlling the inhalation duration by triggering the air flow sensor is disabled. The first switch unit is caused to work for a long time, or the first switch unit stops working for a short time, heat is not dissipated in time, the temperature rise of the first switch unit is too high, the temperature inside the whole electronic cigarette is increased, the first switch unit is deteriorated and damaged, and a peripheral circuit of the first switch unit is also deteriorated and damaged, so that the electronic cigarette is seriously damaged; moreover, the temperature rise inside the electronic cigarette continuously rises, which may cause the electronic cigarette to catch fire, causing a safety problem. Moreover, even if some schemes of the system control module have an over-temperature protection function, the temperature detection of the over-temperature protection cannot fully reflect the working temperature of the first switching tube unit, that is, the maximum working temperature of the first switching tube unit already exceeds the maximum working junction temperature of the device itself, but the temperature protection function has not yet been detected. This also leads to a reduction in the lifetime or reliability of the first switching unit. Meanwhile, if the output power of the electronic cigarette is high, the discharging current of the battery is in the ampere level, for example, 5A, at the moment, the battery works for a long time through the first switch, and because the battery has internal resistance, the temperature rise of the battery is too high due to long-time high-current discharging, and the temperature rise exceeds the safe discharging temperature range of the battery, so that the safety problem is caused.

The technical problem to be solved by the embodiments of the present application is to provide a battery protection circuit, a battery pack and an electronic cigarette. The first switching unit can be prevented from operating for a long time.

In order to solve the above technical problem, a first aspect of the embodiments of the present application provides a battery protection circuit applied to an electronic cigarette, including a battery protection module and a second switch unit, where the battery protection module includes a power supply end, a second ground end, an over-discharge voltage protection unit, a discharge over-current protection unit, a first reference voltage generation unit, and a logic control unit, where the power supply end and the second ground end are correspondingly electrically connected to two ends of a battery, the logic control unit is respectively electrically connected to the over-discharge voltage protection unit and the discharge over-current protection unit, a control end of the second switch unit is electrically connected to the logic control unit, a first end of the second switch unit is electrically connected to the battery, and a second end of the second switch unit is electrically connected to an atomization component;

the battery protection module further comprises a secondary over-suction protection unit and a load detection unit, the secondary over-suction protection unit is respectively electrically connected with the load detection unit and the logic control unit, the load detection unit is used for obtaining a first detection voltage, the first detection voltage is used for corresponding to the current in the main discharge loop where the second switch unit is located, when the secondary over-suction protection unit judges that the current in the main discharge loop is larger than a first current threshold value according to the first detection voltage, the logic control unit starts timing, and when the timing duration of the logic control unit is larger than or equal to a second preset duration, the logic control unit controls the second switch unit to be kept disconnected.

Optionally, the load detection unit includes a system end, the system end is electrically connected to the second end of the second switch unit, the first detection voltage is determined according to the voltage of the system end, when the secondary overvoltage protection unit determines that the first detection voltage is greater than a first reference voltage, the logic control unit starts timing, and when the timing duration of the logic control unit is greater than or equal to a second preset duration, the logic control unit controls the second switch unit to keep off; wherein the first reference voltage is used to characterize the first current threshold.

Optionally, the first detection voltage is a voltage of the system end, or the first detection voltage is a difference between a voltage of the power supply end of the power supply and a voltage of the system end.

Optionally, the first detection voltage is a voltage drop of the second switch unit, when the secondary over-suction protection unit determines that the first detection voltage is greater than a first reference voltage, the logic control unit starts timing, and when a timing duration of the logic control unit is greater than or equal to a second preset duration, the logic control unit controls the second switch unit to keep being disconnected; wherein the first reference voltage is used to characterize the first current threshold.

Optionally, the load detection unit includes a current detection end, the current detection end is configured to be electrically connected to at least one end of a first detection resistor, the second switch unit is configured to be connected in series to the battery and the first detection resistor to form part of the main discharge circuit, the first detection voltage is determined according to a voltage of the current detection end, when the secondary over-absorption protection unit determines that the first detection voltage is greater than a first reference voltage, the logic control unit starts timing, and when a timing duration of the logic control unit is greater than or equal to a second preset duration, the logic control unit controls the second switch unit to keep off; wherein the first reference voltage is used to characterize the first current threshold.

Optionally, the second ground terminal is configured to be electrically connected to a first terminal of the first detection resistor, the current detection terminal is configured to be electrically connected to a second terminal of the first detection resistor, and the first detection voltage is a voltage of the current detection terminal; alternatively, the first and second electrodes may be,

the power supply end is used for being electrically connected with a first end of the first detection resistor, the current detection end is used for being electrically connected with a second end of the first detection resistor, and the first detection voltage is the difference value of the voltage of the power supply end and the voltage of the current detection end; alternatively, the first and second electrodes may be,

the battery protection module comprises a system end, the system end is electrically connected with the second end of the second switch unit, the system end is also used for being electrically connected with the first end of a first detection resistor, the current detection end is used for being electrically connected with the second end of the first detection resistor, and the first detection voltage is the difference value between the voltage of the system end and the voltage of the current detection end or the difference value between the voltage of the current detection end and the voltage of the system end; alternatively, the first and second electrodes may be,

the number of the current detection ends is two, the two current detection ends are correspondingly and electrically connected with two ends of the first detection resistor, and the first detection voltage is the difference value of the voltages of the two current detection ends.

Optionally, the first detection voltage is a voltage drop of the first detection resistor.

Optionally, the secondary over-suction protection unit includes an over-suction comparison unit, one input end of the over-suction comparison unit is connected to a first detection voltage, the other input end of the over-suction comparison unit is connected to a preset first reference voltage, and an output end of the over-suction comparison unit is electrically connected to the logic control unit; wherein the first reference voltage is used to characterize the first current threshold.

Optionally, the logic control unit includes a battery logic unit and an overdriving logic unit, wherein the battery logic unit is electrically connected to the control terminals of the overdischarge voltage protection unit, the discharge overcurrent protection unit and the second switch unit, the overdriving logic unit is electrically connected to the secondary overdriving protection unit, and the overdriving logic unit is electrically connected to the battery logic unit or the overdischarge voltage protection unit.

Optionally, when the timing of the over-suction logic unit is greater than or equal to a second preset duration, the over-suction logic unit outputs a sleep signal to the battery logic unit or outputs an over-discharge signal to the over-discharge voltage protection unit, the battery logic unit controls the battery protection circuit to enter a sleep mode, and the second switch unit is kept off in the sleep mode.

Optionally, at least a part of the cells of the battery protection module stop consuming power in the sleep mode or all the cells of the battery protection module stop consuming power in the sleep mode.

Optionally, the logic control unit includes a battery logic unit and an over-absorption logic unit, wherein the battery logic unit is electrically connected to the over-discharge voltage protection unit and the discharge over-current protection unit, the over-absorption logic unit is electrically connected to the secondary over-absorption protection unit, and both the over-absorption logic unit and the battery logic unit are electrically connected to a control terminal of the second switch unit to control whether the second switch unit is disconnected.

Optionally, the logic control unit still includes logic gate circuit, an input of logic gate circuit with battery logic unit electricity is connected, another input of logic gate circuit with cross and inhale logic unit electricity and be connected, the output of logic gate circuit with the control end electricity of second switch unit is connected, works as logic gate circuit receives arbitrary shutoff during the signal of second switch unit the logic gate circuit control the disconnection of second switch unit, works as battery logic unit with cross and inhale logic unit and all export when switching on the signal of second switch unit the logic gate circuit control the second switch unit switches on.

Optionally, the logic control unit includes an overdriving logic unit, the overdriving logic unit includes a second timing unit and a second duration control unit, an input end of the second timing unit is electrically connected to the secondary overdriving protection unit, an output end of the second timing unit is electrically connected to the second duration control unit, the second duration control unit is electrically connected to a control end of the second switch unit, the second timing unit starts timing when the secondary overdriving protection unit determines, according to the first detection voltage, that the current in the discharge main circuit is greater than a first current threshold, the second timing unit stops timing when the secondary overdriving protection unit determines, according to the first detection voltage, that the current in the discharge main circuit is less than the first current threshold, and the second timing unit stops timing when the second duration control unit determines that the timing duration of the second timing unit is greater than or equal to a second preset duration, the second time length control unit outputs a secondary over-suction protection signal to control the second switch unit to be disconnected; alternatively, the first and second electrodes may be,

the logic control unit comprises a battery logic unit and an over-suction logic unit, and the battery logic unit is respectively and electrically connected with the over-discharge voltage protection unit, the discharge over-current protection unit and the control end of the second switch unit; the over-suction logic unit comprises a second timing unit and a second time length control unit, the input end of the second timing unit is electrically connected with the secondary over-suction protection unit, the output end of the second timing unit is electrically connected with the second time length control unit, and the output end of the second time length control unit is electrically connected with the battery logic unit or the over-discharge voltage protection unit; when the secondary over-suction protection unit judges that the current in the discharge main loop is larger than a first current threshold value according to the first detection voltage, the second timing unit starts timing, when the secondary over-suction protection unit judges that the current in the discharge main loop is smaller than the first current threshold value according to the first detection voltage, the second timing unit stops timing, when the second duration control unit judges that the timing duration of the second timing unit is larger than or equal to a second preset duration, the second duration control unit outputs a sleep signal to the battery logic unit or outputs an over-discharge signal to the over-discharge voltage protection unit, the battery logic unit controls the battery protection circuit to enter a sleep mode, and the second switch unit is kept disconnected in the sleep mode.

Optionally, the second timing unit includes a first reference frequency generation unit and a second timing subunit; the second timing subunit is electrically connected with the secondary over-suction protection unit, the second duration control unit and the first reference frequency generation unit respectively, starts timing when the secondary over-suction protection unit judges that the current in the main discharge loop is greater than a first current threshold value according to the first detection voltage, and stops timing when the secondary over-suction protection unit judges that the current in the main discharge loop is smaller than the first current threshold value according to the first detection voltage; alternatively, the first and second liquid crystal display panels may be,

the second timing unit comprises a second reference frequency generation unit and a second timing subunit; the second reference frequency generation unit is electrically connected with the secondary over-suction protection unit, the second timing subunit is electrically connected with the second duration control unit and the second reference frequency generation unit respectively, when the secondary over-suction protection unit judges that the current in the main discharge loop is larger than a first current threshold value according to the first detection voltage, the second reference frequency generation unit starts to work, and when the secondary over-suction protection unit judges that the current in the main discharge loop is smaller than the first current threshold value according to the first detection voltage, the second reference frequency generation unit stops working.

Optionally, the logic control unit includes an overdriving logic unit, the overdriving logic unit includes a second timing unit, a second duration control unit, a third timing unit and a third duration control unit, an input end of the second timing unit and an input end of the third timing unit are respectively electrically connected to the secondary overdriving protection unit, the second timing unit is electrically connected to the second duration control unit, the third timing unit is electrically connected to the third duration control unit, the third duration control unit is electrically connected to the second timing unit, the second duration control unit is electrically connected to a control terminal of the second switch unit, and the second timing unit starts to time when the secondary overdriving protection unit determines that the current in the discharge main loop is greater than the first current threshold according to the first detection voltage, when the secondary over-suction protection unit judges that the current in the main discharge loop is smaller than a first current threshold value according to the first detection voltage, the third timing unit starts timing, when the secondary over-suction protection unit judges that the current in the main discharge loop is larger than a first current threshold value according to the first detection voltage, the third timing unit stops timing, when the third time length control unit judges that the timing time length of the third timing unit is greater than or equal to a third preset time length, a reset signal is output to the second timing unit so that the second timing unit stops timing and the timing time length is set to zero, when the second time length control unit judges that the timing time length of the second timing unit is greater than or equal to a second preset time length, the second time length control unit outputs a secondary over-suction protection signal to control the second switch unit to be disconnected; alternatively, the first and second electrodes may be,

the logic control unit comprises a battery logic unit and an over-suction logic unit, and the battery logic unit is respectively and electrically connected with the over-discharge voltage protection unit, the discharge over-current protection unit and the control end of the second switch unit; the over-suction logic unit comprises a second timing unit, a second time length control unit, a third timing unit and a third time length control unit, wherein the input end of the second timing unit and the input end of the third timing unit are respectively and electrically connected with the secondary over-suction protection unit, the second timing unit is electrically connected with the second time length control unit, the third timing unit is electrically connected with the third time length control unit, the third time length control unit is electrically connected with the second timing unit, and the second time length control unit is electrically connected with the battery logic unit or the over-discharge voltage protection unit; when the secondary over-suction protection unit judges that the current in the main discharge loop is larger than a first current threshold value according to the first detection voltage, the second timing unit starts timing, when the secondary over-suction protection unit judges that the current in the main discharge loop is smaller than the first current threshold value according to the first detection voltage, the third timing unit stops timing, when the secondary over-suction protection unit judges that the current in the main discharge loop is larger than the first current threshold value according to the first detection voltage, the third timing unit stops timing, when the third duration control unit judges that the timing duration of the third timing unit is larger than or equal to a third preset duration, a reset signal is output to the second timing unit to stop timing the second timing unit and set the timing duration to zero, and when the second duration control unit judges that the timing duration of the second timing unit is larger than or equal to the second preset duration, the second time length control unit outputs a sleep signal to the battery logic unit or outputs an over-discharge signal to the over-discharge voltage protection unit, the battery logic unit controls the battery protection circuit to enter a sleep mode, and the second switch unit is kept disconnected in the sleep mode.

Optionally, the second timing unit includes a first reference frequency generation unit and a second timing subunit, and the third timing unit includes a third timing subunit; the second timing subunit is respectively and electrically connected with the secondary over-suction protection unit, the second duration control unit and the first reference frequency generation unit, the third timing subunit is respectively and electrically connected with the secondary over-suction protection unit, the third duration control unit and the first reference frequency generation unit, the second timing subunit starts timing when the secondary over-suction protection unit judges that the current in the main discharge loop is greater than a first current threshold value according to the first detection voltage, the third timing subunit starts timing when the secondary over-suction protection unit judges that the current in the main discharge loop is less than the first current threshold value according to the first detection voltage, and the third timing subunit stops timing when the secondary over-suction protection unit judges that the current in the main discharge loop is greater than the first current threshold value according to the first detection voltage, when the third time length control unit judges that the timing time length of the third timing subunit is greater than or equal to a third preset time length, a reset signal is output to the second timing subunit so that the second timing unit stops timing and the timing time length is set to zero; alternatively, the first and second liquid crystal display panels may be,

the second timing unit comprises a second reference frequency generation unit and a second timing subunit, and the third timing unit comprises a third timing subunit; wherein, the second reference frequency generating unit is electrically connected with the secondary over-suction protection unit, the second timing subunit is respectively electrically connected with the second time length control unit and the second reference frequency generating unit, the third timing subunit is respectively electrically connected with the secondary over-suction protection unit, the third time length control unit and the second reference frequency generating unit, the third time length control unit is respectively electrically connected with the second timing subunit and the second reference frequency generating unit, when the secondary over-suction protection unit judges that the current in the main discharging loop is larger than the first current threshold value according to the first detection voltage, the second reference frequency generating unit starts to work, the second timing subunit starts to time, when the secondary over-suction protection unit judges that the current in the main discharging loop is smaller than the first current threshold value according to the first detection voltage, the third timing subunit starts to time, when the secondary over-suction protection unit judges that the current in the main discharge loop is larger than a first current threshold value according to the first detection voltage, the third timing subunit stops timing, and when the third duration control unit judges that the timing duration of the third timing subunit is larger than or equal to a third preset duration, a reset signal is output to the second timing subunit and the second reference frequency generation unit so as to set the timing duration of the second timing unit to zero and enable the second reference frequency generation unit to stop working; alternatively, the first and second electrodes may be,

the third preset time period is less than one tenth of the second preset time period.

Optionally, the battery protection module and the second switch unit are located on the same chip, the power supply end is a power supply pin, the second ground end is a second ground pin, the battery protection module further includes a system pin, the system pin is electrically connected to the second end of the second switch unit, and the second end of the second switch unit is used for being electrically connected to the atomization assembly via the system pin; alternatively, the first and second electrodes may be,

the battery protection module is located first chip, first switch unit is located outside first chip, the power supply end is power supply pin, the second earthing terminal is second ground connection pin, the battery protection module includes the system pin, the system pin with the second of second switch unit holds the electricity and connects, the battery protection module still includes second on-off control pin, the second on-off control pin with the control end electricity of second switch unit is connected.

Optionally, the second switch unit includes an NMOS transistor or a PMOS transistor; alternatively, the first and second electrodes may be,

the second switch unit comprises a charging switch unit and a discharging switch unit, the charging switch unit and the discharging switch unit are connected in series, a control end of the charging switch unit and a control end of the discharging switch unit are respectively and electrically connected with the logic control unit, and when the timing duration of the logic control unit is greater than or equal to a second preset duration, the logic control unit controls the discharging switch unit to be kept disconnected; alternatively, the first and second electrodes may be,

the second switch unit comprises a switch tube and a substrate control circuit, the control end of the switch tube is electrically connected with the logic control unit, the substrate control circuit is electrically connected with the switch tube and the logic control unit respectively, the substrate control circuit is used for controlling different bias states of the substrate of the switch tube, and when the timing duration of the logic control unit is greater than or equal to a second preset duration, the logic control unit controls the switch tube to be kept disconnected and controls the substrate of the switch tube to be biased to a charging state.

Optionally, the battery protection module further includes a charging detection unit and a system end, the charging detection unit is electrically connected to the logic control unit and the system end, the system end is electrically connected to the second end of the second switch unit, and when the charging detection unit detects a charging signal, the second switch unit is turned on.

Optionally, the second preset time period is adjustable.

Optionally, the logic control unit includes an overdriving logic unit, the overdriving logic unit includes a first reference frequency generating unit or a second reference frequency generating unit, wherein the first reference frequency generating unit or the second reference frequency generating unit includes a frequency comparator, a frequency switching unit, a first current source, and a frequency capacitor end, wherein a first end of the first current source is electrically connected to the power supply end, a second end of the first current source is respectively electrically connected to the first end of the frequency switching unit, an input end of the frequency comparator, and the frequency capacitor end, another input end of the frequency comparator is connected to a preset first frequency reference voltage, an output end of the frequency comparator is electrically connected to the control end of the frequency switching unit, a second end of the frequency switching unit is electrically connected to the second ground end, and the frequency capacitor end is used for electrically connecting to the frequency capacitor, the second preset time is used for being in a proportional relation with the capacitance value of the frequency capacitor; alternatively, the first and second electrodes may be,

the logic control unit comprises an over-suction logic unit, and the over-suction logic unit comprises a first reference frequency generation unit or a second reference frequency generation unit; the first reference frequency generation unit or the second reference frequency generation unit comprises a frequency comparator, a frequency operational amplifier, a frequency switch unit, a first current source, a second current source, a frequency capacitor and a frequency resistance end, wherein the first current source comprises a first frequency MOS (metal oxide semiconductor) transistor, and the second current source comprises a second frequency MOS transistor; the source electrode of the first frequency MOS tube and the source electrode of the second frequency MOS tube are electrically connected with a power supply end, the grid electrode of the first frequency MOS tube and the grid electrode of the second frequency MOS tube are electrically connected and are commonly connected with the output end of the frequency operational amplifier, one input end of the frequency operational amplifier is connected with a preset second frequency reference voltage, the other input end of the frequency operational amplifier is electrically connected with the drain electrode of the second frequency MOS tube, the drain electrode of the second frequency MOS tube is also electrically connected with a frequency resistance end, the drain electrode of the first frequency MOS tube is respectively electrically connected with the first end of the frequency switch unit, one input end of the frequency comparator and the first end of the frequency capacitor, the other input end of the frequency comparator is connected with a preset first frequency reference voltage, the output end of the frequency comparator is electrically connected with the control end of the frequency switch unit, the second end of the frequency switch unit, The second end of the frequency capacitor is electrically connected with the second grounding end, the frequency resistor end is used for electrically connecting the frequency resistor, and the second preset time length is used for being in a proportional relation with the resistance value of the frequency resistor.

A second aspect of the embodiments of the present application provides a battery pack applied to an electronic cigarette, including:

a battery;

in the battery protection circuit, the power supply end and the second ground end of the battery protection circuit are correspondingly and electrically connected with two ends of the battery.

Optionally, the battery assembly further includes a first detection resistor, the battery, the second switch unit and the first detection resistor are connected in series to form part of the main discharge loop, a first end of the second switch unit is electrically connected with a second end of the first detection resistor, a first end of the first detection resistor is electrically connected with a negative electrode of the battery, the load detection unit comprises a current detection end, the current detection end is electrically connected with the second end of the first detection resistor, the first detection voltage is the voltage of the current detection end, when the secondary over-suction protection unit judges that the first detection voltage is greater than a first reference voltage, the logic control unit starts timing, when the timing duration of the logic control unit is greater than or equal to a second preset duration, the logic control unit controls the second switch unit to be kept disconnected; wherein the first reference voltage is used to characterize the first current threshold; alternatively, the first and second electrodes may be,

the battery assembly further comprises a first detection resistor, the battery, the second switch unit and the first detection resistor are connected in series to form part of the main discharge loop, a first end of the second switch unit is electrically connected with a second end of the first detection resistor, a first end of the first detection resistor is electrically connected with a positive electrode of the battery, the current detection unit comprises a current detection end which is electrically connected with the second end of the first detection resistor, the first detection voltage is the difference value of the voltage of the power supply end of the power supply and the voltage of the current detection end, when the secondary over-suction protection unit judges that the first detection voltage is greater than a first reference voltage, the logic control unit starts timing, when the timing duration of the logic control unit is greater than or equal to a second preset duration, the logic control unit controls the second switch unit to be kept disconnected; wherein the first reference voltage is used to characterize the first current threshold.

The third aspect of the embodiment of the present application provides an electronic cigarette, including an atomizing component, where the atomizing component includes a system control circuit and a heating element, the system control circuit includes a first switch unit and a system control module, a control end of the first switch unit is electrically connected with the system control module, and the first switch unit is connected in series with the heating element to form a heating branch;

the battery protection circuit or the battery assembly is further included, and the second end of the second switch unit is electrically connected with the atomization assembly.

Optionally, the battery, the second switch unit, the heating branch circuit and the system control module are connected to form the main discharging loop, the heating branch circuit and the system control module are connected in parallel to form a parallel circuit, and the battery, the second switch unit and the parallel circuit are connected in series.

Optionally, the system control module includes an airflow detecting end and a system control unit, the airflow detecting end is used to be electrically connected to the airflow detecting element, the airflow detecting end is electrically connected to the system control unit, the system control unit includes a first timing unit, when the system control unit detects airflow flowing through the airflow detecting element, the first timing unit starts timing, and the system control unit drives the first switch unit to operate, when the system control unit does not detect airflow flowing through the airflow detecting element, the first timing unit stops timing and sets zero, and the system control unit stops driving the first switch unit to stop operating, when the timing duration of the first timing unit is greater than or equal to a first preset duration, the system control unit stops driving the first switch unit to stop operating, and the first preset time length is less than the second preset time length.

Optionally, the ratio of the second preset time length to the first preset time length ranges from 1.1:1 to 2: 1; alternatively, the first and second electrodes may be,

the first preset time length and the second preset time length are both adjustable.

Optionally, the system control module drives the first switch unit to operate in a PWM mode or a PFM mode, or drives the first switch unit to operate in a normally on conduction mode.

This application embodiment is worked as through the setting logic control unit timing length of time is more than or equal to the second and predetermines the length of time, logic control unit control the second switch unit keeps the disconnection, after the disconnection of second switch unit, the main loop disconnection of discharging, even first switch unit still opens to switch on the battery and also can not give the power supply of system control circuit, thereby heating element can not reheat, first switch unit and peripheral temperature can not rise again, can prevent that first switch unit or system control module etc. from damaging because of high temperature, arouse the electron cigarette and damage the aggravation, especially can not take place the conflagration. In addition, in the embodiment, by using the second switch unit in the battery protection circuit, no new switch unit needs to be additionally arranged, the battery protection module can realize the secondary over-suction protection function only by simple modification, the periphery of the battery protection circuit and the periphery of the system control circuit can be almost unchanged, and no additional cost needs to be added or the added cost is very low; moreover, the secondary over-smoking protection scheme can be compatible with the existing electronic cigarette, and the application range is wide. Moreover, the battery protection circuit of the present embodiment has a certain distance with the first switch unit and the system control module, and are relatively independent from each other, even if the first switch unit and the system control module are damaged, the battery protection circuit is limited by the influence of the first switch unit and the system control module, and the battery protection circuit of the present embodiment has a secondary over-suction protection function with high reliability and high safety.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a circuit block diagram of a prior art atomizing assembly;

figure 2 is a block diagram of the electronic cigarette according to the first embodiment of the present application;

fig. 3a is a circuit block diagram of a battery protection circuit of the first embodiment;

fig. 3b is a schematic connection diagram of the secondary overdriving protection unit, the logic control unit and the second switch unit in the first embodiment;

FIG. 3c is a schematic diagram of the connection of the secondary over-suction protection unit and the over-suction logic unit in the first embodiment;

FIG. 3d is a schematic diagram of the connection of a secondary over-absorbing protection unit and an over-absorbing logic unit in another embodiment of the present application;

FIG. 3e is a circuit block diagram of the first reference frequency generating unit or the second reference frequency generating unit according to an embodiment of the present application;

FIG. 3f is a block diagram of a first reference frequency generating unit or a second reference frequency generating unit according to another embodiment of the present application;

figure 4 is a block diagram of the electronic cigarette according to another embodiment of the present application;

figure 5 is a block diagram of the electronic cigarette according to a second embodiment of the present application;

figure 6 is a block diagram of circuitry of an electronic cigarette according to another embodiment of the present application;

FIG. 7 is a schematic connection diagram of a secondary over-suction protection unit, a logic control unit and a second switch unit in a third embodiment of the present application;

FIG. 8 is a schematic diagram of the connection between the two-stage over-suction protection unit and the over-suction logic unit in the fourth embodiment of the present application;

FIG. 9 is a schematic diagram of the connection of a secondary over-suction protection unit and an over-suction logic unit in another embodiment of the present application;

figure 10a is a block diagram of the electronic cigarette according to the fifth embodiment of the present application;

figure 10b is a block diagram of the electronic cigarette according to another embodiment of the present application;

figure 10c is a block diagram of the electronic cigarette according to yet another embodiment of the present application;

figure 10d is a circuit block diagram of an electronic cigarette according to yet another embodiment of the present application;

figure 10e is a circuit block diagram of an electronic cigarette according to yet another embodiment of the present application;

figure 10f is a circuit block diagram of an electronic cigarette according to yet another embodiment of the present application;

figure 11 is a block diagram of the electronic cigarette according to a sixth embodiment of the present application;

fig. 12a is a circuit block diagram of a battery protection circuit of the sixth embodiment;

FIG. 12b is a schematic connection diagram of the secondary over-suction protection unit, the logic control unit and the second switch unit in the sixth embodiment;

FIG. 12c is a schematic diagram of the connection of the secondary over-suck protection unit and the over-suck logic unit in the sixth embodiment;

figure 13 is a block diagram of circuitry of an electronic cigarette according to another embodiment of the present application;

figure 14 is a circuit block diagram of an electronic cigarette according to a seventh embodiment of the present application;

figure 15 is a block diagram of circuitry of an electronic cigarette according to another embodiment of the present application;

figure 16a is a block diagram of an electronic cigarette according to an eighth embodiment of the present application;

figure 16b is a block diagram of the electronic cigarette according to another embodiment of the present application;

figure 16c is a block diagram of the electronic cigarette according to yet another embodiment of the present application;

figure 16d is a circuit block diagram of an electronic cigarette according to yet another embodiment of the present application;

figure 17 is a circuit block diagram of an electronic cigarette according to a ninth embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "comprising" and "having," and any variations thereof, as appearing in the specification, claims and drawings of this application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to the listed steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order. The electrical connection of the present application includes direct electrical connection and indirect electrical connection, and the indirect electrical connection means that other electronic components, pins, and the like may also exist between two electrically connected components. The terminal XX referred to in this application may or may not be an actual terminal, for example, only one end of a component or one end of a wire. Three cases are mentioned and/or included in the present application, for example, a and/or B, including A, B, A and B.

Referring to fig. 2, the present application provides an electronic cigarette, which includes a battery assembly 100 and an atomizing assembly 200. The battery assembly 100 includes a battery 110 (bare cell) and a battery protection circuit 120, the battery 110 and the battery protection circuit 120 being generally wrapped together to supply power to the outside; the atomization assembly 200 is electrically connected with the battery assembly 100, the battery assembly 100 is used for supplying power to the atomization assembly 200, the atomization assembly 200 generally comprises a system control circuit, an atomization core, an airflow detection element 240 and the like, the system control circuit is electrically connected with the battery assembly 100, the atomization core comprises a heating element 250, the heating element 250 and the airflow detection element 240 are respectively electrically connected with the system control circuit, the heating element 250 is used for heating the tobacco tar to atomize and generate smoke, and the airflow detection element 240 is used for detecting whether airflow flows in the electronic cigarette.

In an embodiment of the present invention, the battery 110 is a rechargeable battery 110 such as a lithium battery 110, and may also be a non-rechargeable battery 110, and the capacity of the battery 110 is generally 100mAh to 2000mAh, such as 100mAh, 200mAh, 300mAh, 400mAh, 500mAh, 600mAh, 700mAh, 800mAh, 900mAh, 1000mAh, 1100mAh, 1200mAh, 1300mAh, 1400mAh, 1500mAh, 1600mAh, 1700mAh, 1800mAh, 1900mAh, 2000mAh, and the like, and preferably 300mAh to 800 mAh. The number of the batteries 110 is generally one, or may be a plurality of batteries, and when the number of the batteries 110 is a plurality, the plurality of batteries 110 may be connected in parallel or in series or in a mixture of series and parallel, and the electronic cigarette may be set according to actual needs.

In this application, the battery protection circuit 120 includes a battery protection module 130, the battery protection module 130 is electrically connected to the battery 110, a first resistor R1 and a first capacitor C1 are further disposed between the battery 110 and the battery protection module 130, and the first resistor R1 and the first capacitor C1 are used for voltage stabilization filtering. In addition, in other embodiments of the present application, the first resistor R1 and the first capacitor C1 may not be provided between the battery 110 and the battery protection module 130, or only one of them may be provided, and other circuits or electronic components may be provided.

In the present application, the battery protection module 130 is used to protect the battery 110 and prevent permanent damage to the battery 110 itself in the case of overdischarge, discharge overcurrent, and the like of the battery 110. Referring to fig. 3a, in the present application, the battery protection module 130 includes a power supply terminal VDD, a second ground terminal GND2, an over-discharge voltage protection unit 131, a discharge over-current protection unit 134, a system terminal VM, a first reference voltage generation unit 138, a logic control unit 150, and the like, wherein the power supply terminal VDD and the second ground terminal GND2 are correspondingly electrically connected to the positive and negative electrodes of the battery 110, so that the battery 110 can supply power to the battery protection module 130. The system side VM is used to monitor the real-time current flowing through the atomizing assembly 200, although the system side VM may have other functions.

In the present application, the first reference voltage generating unit 138 provides the overdischarge voltage protection unit 131, the discharge overcurrent protection unit 134, and the like with reference voltages to determine whether the battery 110 is in an overdischarge voltage state, an overdischarge state, or the like.

The over-discharge voltage protection unit 131 is used for protecting the battery 110 when detecting that the voltage of the battery 110 is lower than the reference voltage provided by the first reference voltage generation unit 138 during the discharging process of the battery 110, for example, controlling the battery 110 to perform only the minimum discharging, and generally stopping the power supply to the atomization assembly 200, so as to prevent the battery 110 from being permanently damaged due to over-discharging of the battery 110.

The discharge overcurrent protection unit 134 is used for protecting the battery 110 when detecting that the discharge current is too large in the discharge process of the battery 110, for example, the battery 110 stops discharging, and the like, so as to prevent the battery 110 from being permanently damaged or having safety problems due to the too large discharge current.

The logic control unit 150 is used to control the operating state and control logic of each module of the battery protection circuit 120, control whether the battery 110 is discharged outwards, and control whether the battery 110 is charged.

In an embodiment of the present application, the electronic cigarette has a charging function, and the battery protection module 130 may further include an overcharge voltage protection unit 132 and a charge overcurrent protection unit 133. The overcharge voltage protection unit 132 is configured to protect the battery 110 when the voltage of the battery 110 is detected to be higher than the reference voltage provided by the first reference voltage generation unit 138 during the charging process of the battery 110, so as to prevent the battery 110 from being charged again after being fully charged, and prevent the battery 110 from being damaged. The charging overcurrent protection unit 133 is used to protect the battery 110 when detecting that the charging current is too large during the charging process of the battery 110, for example, to stop charging the battery 110, so as to prevent the charging current from being too large and causing permanent damage or safety problems to the battery 110. In addition, in another embodiment of the present application, the electronic cigarette may not have a charging function, and a charging protection is not required. In addition, in the present embodiment, the battery protection module 130 further includes a short-circuit protection unit 135, a temperature protection unit 136, and a reference frequency generation unit 137.

In the present application, the battery protection circuit 120 further includes a second switch unit 140, and the connection manner of the second switch unit 140 and the battery protection module 130 is generally as follows, but it is within the scope of the present application that a person skilled in the art can make simple modifications to the circuit described below as needed.

1. Referring to fig. 2, the battery protection module 130 includes a second switch control terminal CO/DO, the second switch control terminal CO/DO is electrically connected to the logic control unit 150, the control terminal of the second switch unit 140 is electrically connected to the second switch control terminal CO/DO, that is, the second switch unit 140 is located outside the battery protection module 130, the first terminal of the second switch unit 140 is electrically connected to the negative electrode of the battery 110 (the second switch unit 140 is disposed below), the negative electrode of the battery 110 is grounded, and the second terminal of the second switch unit 140 is electrically connected to the system control circuit and the system terminal VM, respectively. In this embodiment, the logic control unit 150 controls the second switch unit 140 to turn on or off through the second switch control terminal CO/DO, so that when the logic control unit 150 controls the second switch unit 140 to turn on, the battery 110 can supply power to the atomizing assembly 200 through the second switch unit 140, the atomizing assembly 200 is in a normal working mode, and the electronic cigarette can work normally; when the logic control unit 150 controls the second switch unit 140 to be turned off, the battery 110 stops supplying power to the atomizing assembly 200, the system control circuit is not supplied with power, and further cannot supply power to the airflow detecting element 240, the heating element 250 and the like, the system control circuit, the airflow detecting element 240, the heating element 250 and the like do not consume power, and the electronic cigarette cannot normally work and is in a dormant state. In an embodiment of the present application, the battery protection module 130 may be implemented on a first chip, which is a battery protection chip at this time, that is, the second switch unit 140 is not located on the first chip (the second switch unit 140 may be located on another chip, or may not be located on a chip, and the first switch unit 210 is external), at this time, the power supply terminal VDD is a power supply pin, the second ground terminal GND2 is a second ground pin, the system terminal VM is a system pin, and the second switch control terminal CO/DO is a second switch control pin. Of course, in other embodiments of the present application, the battery protection module 130 may not be fabricated on a chip, and may be designed according to the needs of a user. When the battery protection module 130 is disposed on one chip and the second switch unit 140 is disposed on another chip, the two chips may be packaged together or not.

2. Referring to fig. 4, the second switch unit 140 is disposed in the battery protection module 130 (the second switch unit 140 is disposed, and at this time, the second switch unit 140 and the battery protection module 130 are located on the same chip), and at this time, the control terminal of the second switch unit 140 is electrically connected to the logic control unit 150, the first terminal of the second switch unit 140 is electrically connected to the second ground GND2, the second ground GND2 is electrically connected to the negative electrode of the battery 110 (the second switch unit 140 is disposed below), the second terminal of the second switch unit 140 is electrically connected to the system terminal VM of the battery protection module 130, and the system terminal VM is electrically connected to the system control circuit. In this embodiment, the logic control unit 150 controls the second switch unit 140 to be turned on or turned off, so that when the logic control unit 150 controls the second switch unit 140 to be turned on, the battery 110 can supply power to the system control circuit through the second switch unit 140 at this time, the system control circuit is in the normal operating mode, and when the logic control unit 150 controls the second switch unit 140 to be turned off, the battery 110 stops supplying power to the system control circuit, and the electronic cigarette is in the sleep mode at this time. In an embodiment of the present invention, the battery protection module 130 and the second switch unit 140 are fabricated on a same chip, and the chip is a battery protection chip, and at this time, the power supply terminal VDD is a power supply pin, the second ground terminal GND2 is a second ground pin, and the system terminal VM is a system pin. Of course, in other embodiments of the present application, the battery protection module 130 may not be fabricated on a chip, and may be designed according to the needs of a user.

3. Referring to fig. 5, the battery protection module 130 includes a second switch control terminal CO/DO electrically connected to the logic control unit 150, a control terminal of the second switch unit 140 is electrically connected to the second switch control terminal CO/DO, that is, the second switch unit 140 is located outside the battery protection module 130, a first terminal of the second switch unit 140 is electrically connected to a positive electrode of the battery 110 (the second switch unit 140 is disposed above), and a second terminal of the second switch unit 140 is electrically connected to the system control circuit and the system terminal VM respectively. In this embodiment, the logic control unit 150 controls the second switch unit 140 to turn on or turn off through the second switch control terminal CO/DO, so that when the logic control unit 150 controls the second switch unit 140 to turn on or turn off, the battery 110 can supply power to the system control circuit through the second switch unit 140, the system control circuit is in a normal operation mode, and when the logic control unit 150 controls the second switch unit 140 to turn off, the battery 110 stops supplying power to the system control circuit. In an embodiment of the present application, the battery protection module 130 may be implemented on a first chip, which is a battery protection chip at this time, that is, the first switch unit 210 is not located on the first chip (the first switch unit 210 may be located on another chip, or may not be located on a chip, and the second switch unit 140 is external), at this time, the power supply terminal VDD is a power supply pin, the second ground terminal GND2 is a second ground pin, the system terminal VM is a system pin, and the second switch control terminal CO/DO is a second switch control pin. Of course, in other embodiments of the present application, the battery protection module 130 may not be fabricated on a chip, and may be designed according to the needs of a user.

4. Referring to fig. 6, the second switch unit 140 is embedded in the battery protection module 130 (the second switch unit 140 is embedded, and at this time, the second switch unit 140 and the battery protection module 130 are on the same chip), at this time, the control terminal of the second switch unit 140 is electrically connected to the logic control unit 150, the first terminal of the second switch unit 140 is electrically connected to the power supply terminal VDD, the power supply terminal VDD is electrically connected to the positive electrode of the battery 110 (the second switch unit 140 is embedded), the second terminal of the second switch unit 140 is electrically connected to the system terminal VM, and the system terminal VM is electrically connected to the system control circuit. In this embodiment, the logic control unit 150 controls the second switch unit 140 to turn on or off, so that when the logic control unit 150 controls the second switch unit 140 to turn on, the battery 110 can supply power to the system control circuit through the second switch unit 140 at this time, the system control circuit is in a normal operation mode, and when the logic control unit 150 controls the second switch unit 140 to turn off, the battery 110 stops supplying power to the system control circuit. In an embodiment of the present invention, the battery protection module 130 and the second switch unit 140 are formed on a same chip, and the chip is a battery protection chip, and at this time, the power supply terminal VDD is a power supply pin, the second ground terminal GND2 is a second ground pin, and the system terminal VM is a system pin. Of course, in other embodiments of the present application, the battery protection module 130 may not be fabricated on a chip, and may be designed according to the needs of a user.

In the above 4 connection manners, referring to fig. 3a, the second switch unit 140 includes a charging switch unit 142 and a discharging switch unit 141 (generally, the first switch unit 210 is externally disposed, but may be internally disposed), wherein the charging switch unit 142 and the discharging switch unit 141 are MOS or other suitable field effect transistors, such as NMOS, PMOS, etc., and the charging switch unit 142 and the discharging switch unit 141 are electrically connected to the logic control unit 150, for example, in fig. 2 and 4, the second switch control terminal CO/DO of the battery protection module 130 includes a charging switch control terminal CO and a discharging switch control terminal DO, the charging switch control terminal CO is electrically connected to the control terminal of the charging switch unit 142, the discharging switch control terminal DO is electrically connected to the control terminal of the discharging switch unit 141, the charging switch control terminal CO and the discharging switch control terminal DO are electrically connected to the logic control unit 150, the logic control unit 150 controls the charging switch unit 142 and the discharging switch unit 141 respectively, and when the discharging is required to be controlled to stop, the logic control unit 150 controls the discharging switch unit 141 to be turned off or off through the discharging switch control terminal DO, and the general charging switch unit 142 is turned on at this time, so that the battery 110 can be charged. In addition, in other embodiments of the present application, the second switch unit 140 may further include a switch tube and a substrate control circuit (generally, the switch tube is used for the first switch unit 210 to be built-in, but may also be external), the switch tube is a MOS or other field effect transistor, for example, NMOS or PMOS, a control end of the switch tube is electrically connected to the logic control unit 150 through the second switch control end CO/DO, the substrate control circuit is electrically connected to the logic control unit 150, the substrate control circuit is used for implementing correct bias of the substrate of the switch tube, for example, the substrate of the switch tube is in different bias states when the battery 110 is discharged and the battery 110 is charged, for example, when it is necessary to control to stop discharging, the logic control unit 150 controls the switch tube to be turned off through the second switch control end CO/DO, and simultaneously controls the substrate bias of the switch tube to be in a charging state through the substrate control circuit, at this time, the battery can be charged, that is, the charging circuit is on, and the discharging main circuit is off. However, the present application is not limited thereto, and in other embodiments of the present application, the second switching unit 140 may also be implemented in other forms, for example, only includes one switching tube, and the switching tube controls the discharge.

In one embodiment of the present application, the atomizing core of the atomizing assembly 200 generally includes two types: ceramic atomizing core and cotton atomizing core. The ceramic atomization core comprises a ceramic seat and a heating element 250, the heating element 250 is installed on the ceramic seat or in the ceramic seat, the ceramic seat is communicated with the tobacco tar bin to supplement the tobacco tar in the tobacco tar bin to the ceramic seat, and when the heating element 250 heats, the ceramic seat is conducted with heat, so that the tobacco tar atomization is realized by heating the tobacco tar. The cotton atomizing core includes oil guide cotton, heating element 250, and oil guide cotton is located heating element 250, and oil guide cotton and tobacco tar storehouse intercommunication are on supplementing the oil guide cotton with the tobacco tar in the tobacco tar storehouse, and when heating element 250 heated, oil guide cotton that is located heating element 250 was heated, and the tobacco tar that oil guide cotton absorbed is heated and is realized the tobacco tar atomizing. The heating element 250 is generally a heating wire or a heating wire, and the material of the heating wire or the heating wire is, for example, iron-chromium-aluminum, stainless steel, nickel-chromium alloy, pure nickel, pure titanium, or the like. The present application is not limited to the two atomizing cores described above, but other conventional atomizing cores may also be used by those skilled in the art.

Referring to fig. 2, in an embodiment of the present application, the system control circuit includes a system control module 272 and a first switch unit 210, and the system control module 272 includes a battery terminal BAT1, a first ground terminal GND1, an atomization terminal AT, an airflow detection terminal EN, and a system control unit 220. The battery terminal BAT1 and the first ground terminal GND1 are electrically connected to the battery assembly 100, respectively; the atomization end AT is electrically connected with the heating element 250; the airflow detecting terminal EN is electrically connected to the airflow detecting element 240, and the airflow detecting element 240 is, for example, an airflow sensor, such as a capacitive microphone, a switch microphone, or the like. In the present embodiment, the system control unit 220 is electrically connected to the battery terminal BAT1, the first ground terminal GND1, the control terminal of the first switch unit 210, and the atomization terminal AT, respectively.

In the present application, the first switching unit 210 and the heating element 250 are connected in series to form a heating branch, and the battery 110, the second switching unit 140, the heating branch and the system control module 272 are electrically connected to form a discharging main loop, wherein the battery 110 and the second switching unit 140 are connected in series, the heating branch and the system control module 272 are connected in parallel to form a parallel circuit, and the parallel circuit is connected in series with the battery 110 and the second switching unit 140 to form a discharging main loop.

In the present application, the first switch unit 210 and the system control module 272 are generally arranged in the following four ways, but those skilled in the art can also simply modify the circuit described below as needed, and this is within the scope of the present application.

1. Referring to fig. 2 and 11, the first switch unit 210 and the system control module 272 are located on the same chip (the first switch unit 210 is built in), which may be referred to as an atomization control chip, a first end of the first switch unit 210 is electrically connected to the battery terminal BAT1 (the first switch unit 210 is built on), a second end of the first switch unit 210 is electrically connected to the atomization terminal AT, the atomization terminal AT is electrically connected to one end of the heating element 250, the other end of the heating element 250 is electrically connected to the first ground GND1, and a control end of the first switch unit 210 is electrically connected to the system control unit 220. In this embodiment, the system control unit 220 controls the first switch unit 210 to turn on or off, so that when the system control unit 220 controls the first switch unit 210 to turn on, the heating branch is turned on and the heating element 250 generates heat, and when the system control unit 220 controls the first switch unit 210 to turn off, the heating branch is turned off and the heating element 250 stops generating heat. When the system control module 272 is located on the chip, the battery terminal BAT1 is a battery pin, the first ground terminal GND1 is a first ground pin, the atomization terminal AT is an atomization pin, and the airflow detection terminal EN is an airflow detection pin.

2. Referring to fig. 13, the first switch unit 210 and the system control module 272 are not located on the same chip (the first switch unit 210 is external), a first end of the first switch unit 210 is electrically connected to the battery terminal BAT1 (the first switch unit 210 is disposed on the top), a second end of the first switch unit 210 is electrically connected to the atomization terminal AT, the atomization terminal AT is electrically connected to one end of the heating element 250, the other end of the heating element 250 is electrically connected to the first ground terminal GND1, and a control terminal of the first switch unit 210 is electrically connected to the system control unit 220 through the first switch control terminal GT (pin). In the present embodiment, the system control unit 220 controls the first switch unit 210 to be turned on or off, so that the heat generating element 250 generates heat when the system control unit 220 controls the first switch unit 210 to be turned on, and the heat generating element 250 stops generating heat when the system control unit 220 controls the first switch unit 210 to be turned off. In this embodiment, the first switch unit 210 is located on one chip, the system control module 272 is located on another chip, and the two chips may be packaged together or not. In addition, in other embodiments of the present application, the system control module 272 may not be provided with the fogging end AT (pin), and the second end of the first switch unit 210 is electrically connected to one end of the heating element 250.

3. Referring to fig. 14, the first switch unit 210 and the system control module 272 are located on the same chip (the first switch unit 210 is built in), a first end of the first switch unit 210 is electrically connected to a first ground GND1 (the first switch unit 210 is placed below), a second end of the first switch unit 210 is electrically connected to an atomization end AT, the atomization end AT is used for electrically connecting to one end of the heating element 250, the other end of the heating element 250 is electrically connected to a battery terminal BAT1, and a control end of the first switch unit 210 is electrically connected to the system control unit 220. In the present embodiment, the system control unit 220 controls the first switch unit 210 to be turned on or off, so that the heat generating element 250 generates heat when the system control unit 220 controls the first switch unit 210 to be turned on, and the heat generating element 250 stops generating heat when the system control unit 220 controls the first switch unit 210 to be turned off.

4. Referring to fig. 15, the first switch unit 210 and the system control module 272 are not located on the same chip (the first switch unit 210 is external), a first end of the first switch unit 210 is electrically connected to a first ground GND1 (the first switch unit 210 is disposed below), a second end of the first switch unit 210 is electrically connected to an atomization end AT, the atomization end AT is electrically connected to one end of the heating element 250, the other end of the heating element 250 is electrically connected to a battery terminal BAT1, and a control end of the first switch unit 210 is electrically connected to the system control unit 220 through a first switch control terminal GT (pin). In the present embodiment, the system control unit 220 controls the first switch unit 210 to be turned on or off, so that the heat generating element 250 generates heat when the system control unit 220 controls the first switch unit 210 to be turned on, and the heat generating element 250 stops generating heat when the system control unit 220 controls the first switch unit 210 to be turned off. In this embodiment, the first switch unit 210 is located on one chip, the system control module 272 is located on another chip, and the two chips may be packaged together or not. In addition, in other embodiments of the present application, the system control module 272 may not be provided with the fogging end AT (pin), and the second end of the first switch unit 210 is electrically connected to one end of the heating element 250.

In the present application, the first switch unit 210 includes an NMOS transistor or a PMOS transistor, and the first switch unit 210 is exemplified as a PMOS transistor in the present embodiment. When the system control unit 220 detects that no airflow flows (for example, the user does not smoke) through the airflow detecting element 240, the system control unit 220 stops driving the first switching unit 210 to stop working, at this time, the first switching unit 210 is turned off, the heating branch is turned off, and the heating element 250 does not heat. When the system control unit 220 detects that airflow flows (for example, a user smokes) through the airflow detecting element 240, the system control unit 220 drives the first switch unit 210 to operate, so that the heating element 250 continuously heats or intermittently heats to heat the tobacco tar to generate smoke, and the smoke is delivered to the mouth of the user through the suction nozzle, thereby achieving a smoking effect.

The conventional system control unit 220 generally drives the heat generating unit to heat, but is not limited to the following three driving methods, and may be other conventional driving methods.

1. The system control unit 220 drives the heating element 250 to work through a PWM (pulse width modulation) mode, specifically, drives the first switch unit 210 to work in a PWM mode, where the PWM mode is a mode in which the frequency (period) is not changed, and the on-time and the off-time of the first switch unit 210 are adjustable, and in this way, the first switch unit 210 is turned on during the on-time in one period, and the first switch unit 210 is turned off during the off-time. The driving method can realize constant power and constant voltage output of the electronic cigarette, when the electronic cigarette does not work (for example, when the electronic cigarette does not smoke), the system control unit 220 stops driving the first switch unit 210, the first switch unit 210 is kept normally off, and the first switch unit 210 does not work at this time.

2. The system control unit 220 drives the heating element 250 to work in a PFM (pulse frequency modulation) mode, specifically, drives the first switch unit 210 to work in a PFM mode, where the PFM mode is a mode in which the frequency (period) can be adjusted, and the on-time or off-time of the first switch unit 210 is unchanged, such that the first switch unit 210 is turned on at the on-time in one period, and the first switch unit 210 is turned off at the off-time. The driving method can realize constant power and constant voltage output of the electronic cigarette, when the electronic cigarette does not work (for example, when the electronic cigarette does not smoke), the system control unit 220 stops driving the first switch unit 210, the first switch unit 210 is kept normally off, and the first switch unit 210 does not work at this time.

3. The system control unit 220 drives the first switch unit 210 to operate in a normally on/off manner, specifically, when it is detected that a user smokes, the airflow detection element 240 is always triggered during a smoking time period, and the first switch unit 210 is always on/off during the triggered time period, so that the first switch unit 210 is not turned off/off. When the electronic cigarette does not work (for example, when the electronic cigarette does not smoke), the system control unit 220 stops driving the first switch unit 210 at this time, the first switch unit 210 is turned off, and at this time, the first switch unit 210 does not work.

In the present application, a person skilled in the art may further add an indicating element, a motor, and the like as needed, where the indicating element is, for example, an LED lamp, a display screen, and the like, and the indicating element, the motor, and the like are electrically connected to the system control module 272, respectively. In addition, when the electronic cigarette has a charging function, the system control module 272 is electrically connected to the charging interface 260 through the charging terminal VCC at this time, the system control module 272 includes a charging unit 230, the charging unit 230 is electrically connected to the system control unit 220, the battery terminal BAT1 and the charging interface 260, respectively, and the charging unit 230 is configured to control a charging process and configured to provide a charging voltage and a charging current according with a charging curve of the battery 110.

When the user smokes a cigarette for a long time (over-smoking), for example, over 15s and 20s, the airflow detection element is triggered during smoking, or the electronic cigarette is in logistics transportation, the airflow detection element is triggered by mistake for a long time (over-smoking); the first switch unit 210 may operate for a long time, which may cause the temperature of the first switch unit 210 to rise too high, and may exceed the maximum operating temperature of the device, for example, 150 ℃, which may cause the lifetime or reliability of the first switch unit 210 to decrease, which may cause short-circuit damage to the first switch unit 210, or temperature rise, which may cause a chain reaction, for example, damage to the system control module 272 around the first switch unit 210.

In order to solve the above problem, in the present application, the system control unit 220 includes an airflow detecting unit, a first timing unit, and a switch control unit, when the airflow detecting unit detects that the airflow flows greatly through the airflow detecting element, for example, the airflow detecting unit detects whether the airflow flows little or much in a manner of detecting the conduction of the microphone switch, the change of the microphone capacitance, the change of the frequency of the microphone capacitance, and the like, and the airflow detecting unit determines whether the airflow flows or the flow of the flow, the flow of the smoke, the flow of the flow. When the airflow detecting unit detects that the airflow flows less or no airflow flows through the airflow detecting element, the first timing unit stops timing, and meanwhile, the switch control unit stops driving the first switch unit 210, and the first switch unit 210 keeps off. When the airflow detecting unit detects that the airflow holding time is long through the airflow detecting element, and when the time length counted by the first timing unit is greater than or equal to the first preset time length, the system control unit 220 also forcibly stops driving the first switching unit 210, and the first switching unit 210 is kept off, so that the temperature of the first switching unit 210 can be prevented from being too high. In the present application, the first preset time period ranges from 4s to 15s, for example, 4s, 5s, 6s, 7s, 8s, 9s, 10s, 11s, 12s, 13s, 14s, 15s, and the like.

In the present application, in order to make up for the above protection deficiency, and prevent the problems caused by the first switch unit 210 working for a long time, or the first switch unit 210 stopping working for a short time, and the heat is not dissipated and works again, for example, the temperature rise of the first switch unit 210 is too high, and then the temperature rise inside the electronic cigarette is increased, when the temperature continues to increase, the first switch unit 210, the system control module 272, and the like may deteriorate and damage, and when the temperature continues to increase, the electronic cigarette may catch fire in a serious situation, and a safety problem is caused, and the following description of specific embodiments is provided to solve at least some of the above problems.

First embodiment

Generally speaking, when the electronic cigarette is in a normal state, the second switch unit 140 is in an on state, and the second switch unit 140 is turned on to realize normal discharge of the battery 110, at this time, the positive electrode of the battery 110, the system control circuit, the second switch unit 140, and the negative electrode of the battery 110 form a discharge main loop. When the first switch unit 210 is turned off, the battery 110 supplies power to the system control module 272, the airflow detecting element 240, and the like, and the battery 110 does not supply power to the heating element 250, at this time, the current of the main discharging loop formed by the battery 110, the second switch unit 140, the system control module 272, and the like is very small, generally in the microampere level, for example, several hundred microamperes, and the current of the main discharging loop is smaller than the first current threshold; when the first switch unit 210 is turned on, the battery 110 needs to supply power to the heating element 250, and at this time, the current on the heating branch is relatively large, generally in the ampere level, such as 0.5A, 1A, 2A, and the like, so that the current in the main discharge loop formed by the battery 110, the second switch unit 140, the first switch unit 210, the heating element 250, the system control module 272 is also relatively large, the current in the main discharge loop is greater than the first current threshold, the resistance of the second switch unit 140 is generally determined, and is generally in the milliohm level, such as several tens of milliohms, and the voltage drop of the second switch unit 140 is the product of the resistance of the second switch unit 140 and the flowing current. In this embodiment, when the first switch unit 210 is turned off, the voltage drop of the second switch unit 140 is generally in the microvolt level, and when the second switch unit 140 is turned on, the voltage drop of the second switch unit 140 is generally in the millivolt level, so that whether the first switch unit 210 is turned on or not can be determined by detecting the difference of the voltage drops across the second switch unit 140.

Specifically, when the second switch unit 140 is placed downward, the first end of the second switch unit 140 is electrically connected to the negative electrode of the battery 110, and the voltage at the second end of the second switch unit 140 is the voltage drop of the second switch unit 140 because the negative electrode of the battery 110 is grounded. When the second switch unit 140 is placed on top, and the first terminal of the second switch unit 140 is electrically connected to the positive terminal of the battery 110, the voltage drop of the second switch unit 140 is the voltage of the battery 110 minus the voltage of the system terminal VM, and the voltage of the battery 110 is approximately equal to the voltage of the power supply terminal VDD.

Referring to fig. 2 and fig. 3a, in the present embodiment, the second switch unit 140 is externally disposed and the second switch unit 140 is disposed below. The battery protection module 130 of this embodiment includes a load detection unit, which is configured to obtain a first detection voltage, where the first detection voltage is configured to correspond to a current in a discharge main loop where the second switch unit 140 is located, for example, the first detection voltage and the current in the discharge main loop are in a linear relationship, and can be represented by the following equation:

U=kI+b；

where U denotes a first detection voltage, I denotes a current flowing through the second switching unit 140 in the discharge main circuit, k is a constant different from 0, k may be positive or negative, b is a constant, and in this embodiment, k is positive and b is 0.

In the present embodiment, the first detection voltage is used to have a linear relationship with the voltage drop of the second switching unit 140. The load detection unit includes a system end VM, the system end VM is electrically connected to the second end of the second switch unit 140, at this time, the voltage drop of the second switch unit 140 is equal to the voltage of the system end VM minus the voltage of the second ground end GND2, since the second ground end GND2 is electrically connected to the negative electrode of the battery and is electrically grounded, the first end of the second switch unit 140 is electrically connected to the negative electrode of the battery, the voltage drop of the second switch unit 140 is the voltage of the system end VM, the voltage of the system end VM can be used for determining the first detection voltage, in this embodiment, the voltage of the system end VM is the first detection voltage, that is, the first detection voltage is the voltage drop of the second switch unit 140, and at this time, the ratio of the first detection voltage to the voltage drop of the second switch unit 140 is 1: 1. Of course, in other embodiments, the voltage drop of the second switch unit 140 may also be converted to obtain the first detection voltage, and the ratio may not be 1:1 at this time, and is set according to the user requirement. In addition, in other embodiments of the present application, referring to fig. 4, the second switch unit 140 is disposed inside and the second switch unit 140 is disposed below, at this time, the system terminal VM is electrically connected to the second terminal of the second switch unit 140, the second switch unit 140 is electrically connected to the system control circuit through the system terminal VM, and the voltage of the system terminal VM can also be used to determine the first detection voltage, for example, the voltage of the system terminal VM is the first detection voltage. The system side VM of the embodiment is an originally existing terminal of the battery protection circuit 120, which is beneficial to reducing the cost and does not need to modify the whole circuit module of the electronic cigarette.

Referring to fig. 3b and fig. 3c, the battery protection module 130 further includes a secondary over-absorption protection unit 160, the secondary over-absorption protection unit 160 is electrically connected to the load detection unit and the logic control unit 150, respectively, and in this embodiment, the secondary over-absorption protection unit 160 is electrically connected to the system VM. In this embodiment, the secondary overdriving protection unit 160 includes an overdriving comparison unit 161, and the overdriving comparison unit 161 is, for example, a voltage comparator. One input end of the overdriving comparison unit 161 is electrically connected to the system end VM for accessing the first detection voltage, the other input end of the overdriving comparison unit 161 is electrically connected to the first reference voltage generation unit 138, the first reference voltage generation unit 138 generates the first reference voltage Vref1 and inputs the first reference voltage Vref1 to the overdriving comparison unit 161, and the first reference voltage Vref1 is used for representing the first current threshold, that is, when the current in the main discharging loop is the first current threshold, the voltage of the system end VM is the first reference voltage Vref1 at this time. In the present embodiment, when the first switch unit 210 is turned on, the current in the discharging main loop is greater than the first current threshold, and the voltage of the system side VM is greater than the first reference voltage Vref 1; when the first switch unit 210 is turned off, the current in the discharge main loop is smaller than the first current threshold, the voltage of the system terminal VM is smaller than the first reference voltage Vref1, and the k value in the above equation is positive, that is, the first current threshold is larger than the current flowing through the second switch unit 140 when the first switch unit 210 is turned off, and the first current threshold is smaller than the current flowing through the second switch unit 140 when the first switch unit 210 is turned on, so that the first reference voltage Vref1 is larger than the product of the current flowing through the second switch unit 140 when the first switch unit 210 is turned off and the resistance of the second switch unit 140, and the first reference voltage Vref1 is smaller than the product of the current flowing through the second switch unit 140 and the resistance of the second switch unit 140 when the first switch unit 210 is turned on, and is preferably near the middle value. In the present embodiment, the range of the first reference voltage Vref1 is between several tens of microvolts and several tens of millivolts, for example, 100uV, 200uV, 300uV, 400uV, 500uV, 600uV, 700uV, 800uV, 900uV, 1mV, 5mV, 10mV, 20mV, 30mV, 40mV, 50mV, etc., and those skilled in the art can set the range according to actual needs. In the present embodiment, as those skilled in the art can easily understand, the first current threshold is not actually existed, the first reference voltage Vref1 is actually existed, and it can be detected that the first reference voltage Vref1 is used to characterize the first current threshold.

Referring to fig. 3b, in the present embodiment, the logic control unit 150 includes an over-absorbing logic unit 152 and a battery logic unit 151, wherein the battery logic unit 151 is electrically connected to the over-discharging voltage protection unit 131, the discharging over-current protection unit 134, the over-charging voltage protection unit 132, the charging current protection unit 133, and the like, the battery logic unit 151 is further electrically connected to the control terminal of the second switch unit 140, the battery logic unit 151 can control the second switch unit 140 to be turned on or off, and the battery logic unit 151 is a circuit unit of the conventional battery protection circuit 120. In this embodiment, the overdraw logic unit 152 is electrically connected to the secondary overdraw protection unit 160, specifically, to an output terminal of the overdraw comparison unit 161, and the overdraw logic unit 152 is further electrically connected to a control terminal of the second switch unit 140.

Referring to fig. 3c, in the present embodiment, the overdraw logic unit 152 includes a second timing unit 171 and a second duration control unit 172, an input end of the second timing unit 171 is electrically connected to an output end of the overdraw comparison unit 161, an output end of the second timing unit 171 is electrically connected to the second duration control unit 172, and an output end of the second duration control unit 172 is electrically connected to a control end of the second switch unit 140. In addition, in order to maintain the signal at the output end of the second duration control unit 172, the overdraw logic unit 152 may further include a trigger, one end of the trigger is electrically connected to the output end of the second duration control unit 172, and the other end of the trigger is electrically connected to the control end of the second switch unit 140, but the trigger may not be provided.

In this embodiment, when an airflow flows, the airflow detecting element 240 is triggered, the first switching unit 210 is turned on, the current in the discharge main circuit is large, the voltage drop across the second switching unit 140 is large, the voltage of the system terminal VM is large, the suck-through comparing unit 161 determines that the voltage of the system terminal VM is larger than the first reference voltage Vref1, the suck-through comparing unit 161 outputs a first level signal at this time, the second timing unit 171 starts timing (edge triggering or level triggering), when no airflow flows (or is at the low level of the PWM signal and the low level of the PFM signal), the first switching unit 210 is turned off and off, the current in the discharge main circuit is small, the voltage drop across the second switching unit 140 is small, the voltage of the system terminal VM is small, the suck-through comparing unit 161 determines that the voltage of the system terminal VM is lower than the first reference voltage Vref1, the suck-through comparing unit 161 outputs a second level signal, the second timing unit 171 stops timing (edge-triggered or level-triggered) and sets the timing duration to zero, so that the second timing unit 171 can directly obtain the heating duration of the heating element 250 in real time and output the heating duration to the second duration control unit 172. In this embodiment, the first level signal is, for example, a high level or a low level, the second level signal corresponds to, for example, a low level or a high level, the edge trigger is, for example, a rising edge trigger or a falling edge trigger, and the level trigger is, for example, a high level trigger or a low level trigger.

When the first switch unit 210 is damaged or the system control module 272 is partially damaged or has other problems, one of possible failure situations is that the first switch unit 210 is continuously turned on and is not turned off, the current in the discharge main circuit is large, the voltage of the system terminal VM is large and is larger than the first reference voltage Vref1, at this time, the second timing unit 171 keeps timing all the time and does not stop timing and set zero, the second timing unit 171 outputs the timing duration to the second duration control unit 172 in real time, when the second duration control unit 172 knows that the duration of the first switch unit 210 being turned on is larger than or equal to the second preset duration, the second duration control unit 172 outputs the secondary over-suction protection signal to control the second switch unit 140 to keep off, when the second switch unit 140 being turned off, the discharge main circuit being turned off, even though the first switch unit 210 is still turned on, the battery 110 will not supply power to the system control circuit, therefore, the heating element 250 is not reheated, the temperature of the first switch unit 210 and the surrounding temperature thereof is not increased, and the first switch unit 210 or the system control module 272 can be prevented from being damaged due to high temperature, so that the damage of the electronic cigarette is prevented from being aggravated, and particularly, a fire disaster cannot occur. Moreover, the present embodiment utilizes the existing system side VM of the battery protection module 130, and the battery protection module 130 only needs to modify the internal circuit a little, so that the cost is low. In this embodiment, the secondary over-suction protection signal is, for example, a turn-off signal, or a signal obtained by processing the turn-off signal, and the second switch unit 140 can be controlled to be turned off.

Referring to fig. 2, after the second switch unit 140 is turned off, the main discharging circuit is turned off, and then the voltage of the system terminal VM is the voltage of the battery 110, the overdriving comparison unit 161 continuously outputs the first level signal, so that the second timing unit 171 keeps timing, and the second duration control unit 172 continuously outputs the second level overdriving protection signal to control the second switch unit 140 to keep turning off. In addition, in other embodiments of the present application, when the second duration control unit 172 learns that the duration that the first switching unit 210 is turned on is greater than or equal to the second preset duration, the second duration control unit 172 outputs the secondary overdriving protection signal to turn off the second switching unit 140, and meanwhile, the second duration control unit 172 locks and outputs the secondary overdriving protection signal to the second switching unit 140, and controls to set the timing duration of the second timing unit 171 to zero. In this embodiment, the secondary overdriving protection signal may be a signal for turning off the second switch unit 140, or may be a signal for triggering a circuit behind the second duration control unit 172 to generate a signal for turning off the second switch unit 140.

When a user removes a fault of the first switch unit 210 or the system control module 272 through maintenance, at this time, the voltage of the system VM may be pulled down to enable the overdriving comparison unit 161 to output a second level signal, so that the second timing unit 171 stops timing, the second timing unit 171 resets and clears and outputs to the second duration control unit 172, the second duration control unit 172 outputs a conducting signal to the second switch unit 140, and the second switch unit 140 is turned on to be activated again. In this embodiment, the system side VM may be pulled down to a low level by connecting a charger. In addition, in other embodiments of the present application, the second duration control unit 172 may further output the conducting signal in a manner of a combination key, a physical switch, and the like, so that the second switch unit 140 is turned on again to realize reactivation, and a person skilled in the art may set the reactivation according to actual conditions.

In order to prevent the primary over-smoking protection of the electronic cigarette from being triggered and directly triggering the secondary over-smoking protection to cause using troubles for users, for example, the electronic cigarette needs to be activated to normally work after the secondary over-smoking protection, in this embodiment, the second preset duration is longer than the first preset duration, so that the battery protection circuit 120 can be prevented from being protected when the system control module 272 is not protected, and the normal use of the users is affected, that is, the secondary over-smoking protection can be triggered only when the primary over-smoking protection in the system control module 272 is invalid and damaged. In this embodiment, the second preset time period is, for example, 10% longer than the first preset time period, for example, the second preset time period is 5s, 6s, 7s, 8s, 9s, 10s, 11s, 12s, 13s, 14s, 15s, 16s, 17s, 18s, 19s, 20s, and preferably, the ratio of the second preset time period to the first preset time period ranges from 1.1 to 2, and setting the upper limit of the ratio can prevent the second-level over-smoking protection from being damaged and aggravated due to the delay of the second-level over-smoking protection, thereby reducing the effect of the second-level over-smoking protection.

Referring to fig. 3c, in the present embodiment, the second timing unit 171 includes a first reference frequency generating unit 174 and a second timing subunit 173, the first reference frequency generating unit 174 is electrically connected to the second timing subunit 173, one end of the second timing subunit 173 is electrically connected to the output end of the over-suction comparing unit 161, and the other end of the second timing subunit 173 is electrically connected to the second duration control unit 172. In an embodiment of the present application, the second timing subunit 173 counts the number of cycles of the first reference frequency generation unit 174, and the product of the count and the frequency cycle is the duration. In another embodiment of the present application, the second timing subunit 173 may also represent the time duration by counting the obtained number of cycles, or represent the time duration in other conventional manners. In this embodiment, the second timing subunit 173 starts timing by one type of edge trigger or one type of level trigger, and stops timing by another type of edge trigger or another type of level trigger and sets the timing duration to zero. The edge trigger is, for example, a rising edge trigger or a falling edge trigger, and the level trigger is, for example, a high level trigger or a low level trigger. In this embodiment, the first reference frequency generating unit 174 may be shared with other units in the system control module 272, which may save costs. The first reference frequency generating unit 174 is, for example, an oscillator or the like.

In this embodiment, whether the electronic cigarette is operated or not, the first reference frequency generating unit 174 of the second timing unit 171 always needs to be operated, which results in higher energy consumption, and in order to save energy consumption, in other embodiments of the present application, referring to fig. 3d, the second timing unit 171 includes a second reference frequency generating unit 178 and a second timing subunit 173, the second reference frequency generating unit 178 is located between the second timing subunit 173 and the over-suck comparing unit 161, specifically, an input end of the second reference frequency generating unit 178 is electrically connected to an output end of the over-suck comparing unit 161, an output end of the second reference frequency generating unit 178 is electrically connected to the second timing subunit 173, the second reference frequency generating unit 178 generates a frequency signal by triggering of one edge or one level, and correspondingly stops generating the frequency signal by triggering of another edge or another level, and thus power consumption can be reduced. Specifically, the secondary overdriving protection unit 160 determines whether the voltage of the system VM is greater than the first reference voltage Vref1, when the voltage of the system VM changes from being lower than the first reference voltage Vref1 to being higher than the first reference voltage Vref1, the output level signal of the overdriving comparison unit 161 changes, the second reference frequency generation unit 178 triggers to generate a frequency signal when receiving an edge signal or a changed level signal, the second timing subunit 173 starts to time according to the received frequency signal and outputs the timed real-time duration to the second duration control unit 172; when the voltage of the system terminal VM changes from being higher than the first reference voltage Vref1 to being lower than the first reference voltage Vref1, the output level signal of the overdraw comparison unit 161 changes again, the second reference frequency generation unit 178 stops generating the frequency signal when receiving another edge signal or another level signal after the change, and the second timing unit 171 stops timing and resets the timing duration to 0. The relationship between the second duration control unit 172 and the second switch unit 140 is the same as that shown in fig. 3b, and is not described herein again. In this embodiment, the second timing subunit 173 and the second duration control unit 172 may be combined into one circuit module, or may be separately implemented.

In this embodiment, the second preset time period is adjustable, and specific adjustable manners include, but are not limited to, the following three, and those skilled in the art may design other conventional time period adjustable circuits according to practical considerations. In other embodiments of the present application, the second preset duration may not be adjustable.

1. Referring to fig. 3e, the first reference frequency generating unit 174 or the second reference frequency generating unit 178 includes a frequency comparator 331, a frequency switching unit PK1, a first current source 310, and a frequency capacitance terminal (pin) PC. The first end of the first current source 310 is electrically connected to the power supply terminal VDD, the second end of the first current source 310 is electrically connected to the first end of the frequency switch unit PK1, an input end of the frequency comparator 331, and the frequency capacitor terminal PC, the other input end of the frequency comparator 331 is connected to a predetermined first frequency reference voltage, the output end of the frequency comparator 331 is electrically connected to the control terminal of the frequency switch unit PK1, the second end of the frequency switch unit PK1 is electrically connected to the second ground terminal, the frequency capacitor terminal PC is electrically connected to one end of the frequency capacitor C2, and the other end of the frequency capacitor C2 is grounded. The operation principle of fig. 3e for generating the frequency or period is conventional in the art and will not be described herein. The frequency period of the first reference frequency generating unit 174 or the second reference frequency generating unit 178 is in a linear relationship with the capacitance value of the capacitor, and the period is also in a linear relationship with the second preset time period, so that the second preset time period is in a proportional relationship with the capacitance value of the frequency capacitor, and the parameter value of the first reference frequency generating unit 174 or the second reference frequency generating unit 178 is determined after the chip is manufactured, so that the second preset time period can be changed by changing the capacitance value of the frequency capacitor C2. Here, frequency capacitor C2 is external, does not lie in the battery protection chip promptly, and frequency capacitor end PC just can obtain different second and predetermine duration through the frequency capacitor C2 of electric connection different electric capacities, realizes that second predetermines duration adjustable. In addition, in other embodiments, the first reference frequency generating unit 174 or the second reference frequency generating unit 178 further includes a first frequency capacitor C2, the second frequency capacitor C2 may be externally connected to the frequency capacitor PC, at this time, the first frequency capacitor C2 and the second frequency capacitor C2 are arranged in parallel, when the frequency capacitor PC is suspended, the second preset time duration is determined by the built-in first frequency capacitor C2, when the frequency capacitor PC is externally connected to the second frequency capacitor C2 with different capacitance values, at this time, the second preset time duration is determined by the first frequency capacitor C2 and the second frequency capacitor C2 together, and the second preset time duration is adjustable.

2. Referring to fig. 3f, the first reference frequency generating unit 174 or the second reference frequency generating unit 178 includes a frequency comparator 331, a frequency operational amplifier 332, a frequency switching unit PK1, a first current source 310, a second current source 320, a frequency capacitor C2 and a frequency resistor terminal (pin) PR, wherein the first current source 310 includes a first frequency MOS transistor PM1, and the second current source 320 includes a second frequency MOS transistor PM 2. Wherein, the source of the first frequency MOS transistor PM1 and the source of the second frequency MOS transistor PM2 are both electrically connected to the power supply terminal VDD, the gate of the first frequency MOS transistor PM1 and the gate of the second frequency MOS transistor PM2 are electrically connected to the output terminal of the frequency operational amplifier 332, one input terminal of the frequency operational amplifier 332 is connected to a preset second frequency reference voltage, the other input terminal of the frequency operational amplifier 332 is electrically connected to the drain of the second frequency MOS transistor PM2, the drain of the second frequency MOS transistor PM2 is also electrically connected to the frequency resistance terminal PR, the drain of the first frequency MOS transistor PM1 is respectively electrically connected to the first terminal of the frequency switch unit PK1, one input terminal of the frequency comparator 331 and the first terminal of the frequency capacitor C2, the other input terminal of the frequency comparator 331 is connected to a preset first frequency reference voltage, the output terminal of the frequency comparator 331 is electrically connected to the control terminal of the frequency switch unit PK1, the second terminal of the frequency switch unit PK1 is grounded, the second terminal of the frequency capacitor C2 is grounded, the frequency resistor PR is electrically connected to the first terminal of the frequency resistor R2, and the second terminal of the frequency resistor R2 is grounded. The operation principle of fig. 3f for generating frequency is conventional in the art and will not be described herein. In this embodiment, the frequency generated by the first reference frequency generating unit 174 or the second reference frequency generating unit 178 is linearly related to the current flowing through the capacitor, the period is the reciprocal of the frequency, and the period is linearly related to the second preset time period, so that the second preset time period is proportional to the resistance value of the frequency resistor, and the parameter of the first reference frequency generating unit 174 or the second reference frequency generating unit 178 is determined after the chip is manufactured, so that the current flowing through the capacitor is determined by the frequency resistor R2, so that the second preset time period can be changed by changing the resistance value of the frequency resistor R2. Here, the frequency resistor R2 is external, and the frequency resistor PR can obtain different second preset durations by connecting the frequency resistors R2 with different resistance values, so that the second preset duration is adjustable. Here, the first current source 310 and the second current source 320 constitute a mirror current source, a proportional current source, or the like. In addition, the first reference frequency generating unit 174 or the second reference frequency generating unit 178 further includes a first frequency resistor R2, which may be externally connected to a second frequency resistor R2 through a frequency resistor PR, at this time, the first frequency resistor R2 and the second frequency resistor R2 are arranged in parallel, when the frequency resistor PR is suspended, the second preset time duration is determined by the first frequency resistor R2, when the frequency resistor PR is externally connected to a second frequency resistor R2 with different resistance values, at this time, the second preset time duration is determined by the first frequency resistor R2 and the second frequency resistor R2 together, and the second preset time duration is adjustable.

3. The magnitude of the current output to the frequency capacitor C2 can also be adjusted by a microcontroller or by a built-in multi-path current source with different current values, so as to adjust the second preset time duration.

In this embodiment, it is adjustable to predetermine time through setting up the second to when the electron cigarette of different first predetermine time uses the battery protection circuit of this application, only need adjust the second and predetermine time, just can satisfy the second more easily and predetermine time long be greater than the first predetermined long demand of time, need not additionally design new battery protection circuit, the compatibility is stronger. Moreover, different users, different brands, different manufacturers and the like have different requirements on the second preset time, and the second preset time is designed to be adjustable, so that the requirements of different users, different brands and different manufacturers can be met, and the time competitiveness of the battery protection circuit is improved.

In addition, in the embodiment, please refer to fig. 3b continuously, the logic control unit 150 further includes a logic gate circuit 153, one input end of the logic gate circuit 153 is electrically connected to the battery logic unit 151, the other input end of the logic gate circuit 153 is electrically connected to the overdriving logic unit 152, specifically, the output end of the second duration control unit 172, and the output end of the logic gate circuit 153 is electrically connected to the control end of the second switch unit 140, in this embodiment, the logic gate circuit 153 includes an and gate. In addition, in other embodiments of the present application, the logic gate circuit 153 may also be a combination of an and gate and a not gate, or a combination of an or gate and a not gate, and an and gate, or a combination of an or gate and a not gate to implement the desired control signal, the not gate may be located in front of or behind the and gate, or the gate, and the number of the not gate, the and gate, or the gate may be one or more, and those skilled in the art may set the logic gate circuit according to actual needs. In the embodiment, the logic gate circuit 153 is additionally arranged, so that the original battery logic unit 151 does not need to be modified, and the design difficulty is greatly reduced. In the embodiment, the logic gate circuit 153 controls the second switch unit 140 to be turned off when the logic gate circuit 153 receives any one of the signals for turning off the second switch unit 140, and the logic gate circuit 153 controls the second switch unit 140 to be turned on when the battery logic unit 151 and the overdraw logic unit 152 both output the signal for turning on the second switch unit 140. Under normal conditions, the battery logic unit 151 and the overdriving logic unit 152 both output signals to turn on the second switch unit 140.

Second embodiment

Referring to fig. 5, fig. 5 is a circuit block diagram of an electronic cigarette according to a second embodiment of the present application, which is similar to the first embodiment, so that the undescribed portion of the present embodiment can refer to the first embodiment, and the main difference between the present embodiment and the first embodiment is that the second switch unit 140 is disposed on the top.

Referring to fig. 5, in the present embodiment, the second switch unit 140 is externally disposed and the second switch unit 140 is externally disposed. Referring to fig. 5 and fig. 3a in combination, in the present embodiment, the battery protection module 130 includes a load detection unit, the load detection unit is configured to obtain a first detection voltage, the first detection voltage is configured to correspond to a current in a main discharge loop where the first switch unit 210 is located, for example, the first detection voltage and the current in the main discharge loop are in a linear relationship, which can be represented by the following formula:

U=kI+b；

where U represents the first detection voltage, I represents the current flowing through the second switching unit 140 in the discharge main circuit, k is a constant different from 0, k may be positive or negative, b is a constant, and k is negative in this embodiment, and b is the voltage of the battery 110.

In the present embodiment, the first detection voltage is used to have a linear relationship with the voltage drop of the second switching unit 140. The load detection unit includes a system end VM, the system end VM is electrically connected to the second end of the second switch unit 140, at this time, the voltage drop of the second switch unit 140 is the current flowing through the second switch unit 140 multiplied by the resistance of the second switch unit 140, and is also the voltage of the battery 110 minus the voltage of the system end VM, the voltage of the battery 110 is almost equal to the voltage of the power supply end VDD, so that the voltage of the system end VM subtracted from the voltage of the power supply end VDD is the voltage drop of the second switch unit, the voltage drop of the second switch unit 140 is in a linear relationship with the current in the main discharge loop, and the voltage drop of the second switch unit 140 can be used to determine a first detection voltage, in this embodiment, the first detection voltage is the voltage drop of the second switch unit 140, and is the voltage of the power supply end VDD minus the voltage of the system end VM. Of course, in other embodiments, the voltage drop of the second switch unit 140 may be converted to obtain the first detection voltage. In addition, in another embodiment of the present application, please refer to fig. 6, the second switch unit 140 is disposed inside and the second switch unit 140 is disposed on top, at this time, the system side VM is electrically connected to the second side of the second switch unit 140, and the second switch unit 140 is electrically connected to the system control circuit through the system side VM. The system side VM of the embodiment is an originally existing terminal of the battery protection circuit 120, which is beneficial to reducing the cost and does not need to modify the whole circuit module of the electronic cigarette.

Referring to fig. 5, fig. 3b and fig. 3c, in the present embodiment, the battery protection module 130 further includes a secondary over-suction protection unit 160, and the secondary over-suction protection unit 160 is electrically connected to the load detection unit and the logic control unit 150, respectively. In this embodiment, the secondary overdriving protection unit 160 includes an overdriving comparison unit 161, and the overdriving comparison unit 161 is, for example, a voltage comparator. One input end of the overdriving comparison unit 161 is configured to access a first detection voltage, the other input end of the overdriving comparison unit 161 is electrically connected to the first reference voltage generation unit 138, the first reference voltage generation unit 138 generates a first reference voltage Vref1 and inputs the first reference voltage Vref1 to the overdriving comparison unit 161, and the first reference voltage Vref1 is configured to represent a first current threshold, that is, when the current in the main discharge loop is the first current threshold, the voltage drop of the second switch unit is the first reference voltage Vref 1. In the embodiment, when the first switch unit 210 is turned on, and the current in the discharging main loop is greater than the first current threshold, the voltage drop of the second switch unit 140 is relatively large and is greater than the first reference voltage Vref 1; when the first switch unit 210 is turned off, and the current in the discharge main loop is smaller than the first current threshold, the voltage drop of the second switch unit 140 is smaller and smaller than the first reference voltage Vref 1. In the present embodiment, the first current threshold is greater than the current flowing through the second switch unit 140 when the first switch unit 210 is turned off, and the first current threshold is less than the current flowing through the second switch unit 140 when the first switch unit 210 is turned on, so that the first reference voltage Vref1 is greater than the voltage drop of the second switch unit 140 when the first switch unit 210 is turned off, and the first reference voltage Vref1 is less than the voltage drop of the second switch unit 140 when the first switch unit 210 is turned on, preferably around a middle value. In the present embodiment, the range of the first reference voltage Vref1 is such a range between several tens of microvolts to several tens of millivolts. Moreover, in the present embodiment, whether the first switching unit 210 is turned on or not is determined by determining the voltage drop of the second switching unit 140, so that the influence caused by the voltage variation of the battery 110 can be removed. In addition, in other embodiments of the present application, the first detection voltage may also be determined by the voltage of the system terminal VM.

Referring to fig. 3b, in the present embodiment, the logic control unit 150 includes an over-suction logic unit 152 and a battery logic unit 151, and for detailed description, reference is made to the first embodiment, which is not repeated herein.

Referring to fig. 5, after the second switch unit 140 is turned off, the main discharging loop is turned off, and then the system terminal VM is grounded, so that the first detection voltage is the battery voltage, that is, the voltage drop of the second switch unit 140 is greater than the first reference voltage Vref1, the overdriving comparison unit 161 continuously outputs the first level signal, so that the second timing unit 171 keeps timing, and the second duration control unit 172 continuously outputs the second level overdriving protection signal to control the second switch unit 140 to keep turning off. In addition, in other embodiments of the present application, when the second duration control unit 172 learns that the duration that the first switching unit 210 is turned on is greater than or equal to the second preset duration, the second duration control unit 172 outputs the secondary overdriving protection signal to turn off the second switching unit 140, and meanwhile, the second duration control unit 172 locks and outputs the secondary overdriving protection signal to the second switching unit 140, and controls to set the timing duration of the second timing unit 171 to zero. In this embodiment, the secondary overdriving protection signal may be a signal for turning off the second switch unit 140, or may be a signal for triggering a circuit behind the second duration control unit 172 to generate a signal for turning off the second switch unit 140.

When a user gets rid of the failure of the first switch unit 210 or the system control module 272 through maintenance, the voltage of the system VM may be pulled up at this time, so that the first detection voltage is smaller than the first reference voltage Vref1, the overdriving comparison unit 161 outputs the second level signal, so that the second timing unit 171 stops timing, the second timing unit 171 resets and clears and outputs to the second duration control unit 172, the second duration control unit 172 outputs the conducting signal to the second switch unit 140, and the second switch unit 140 is turned on to realize reactivation. In this embodiment, the system side VM may be pulled high to a high level by connecting a charger. In addition, in other embodiments of the present application, the second duration control unit 172 may further output the conducting signal in a manner of a combination key, a physical switch, and the like, so that the second switch unit 140 is turned on again to realize reactivation, and a person skilled in the art may set the reactivation according to actual conditions.

Referring to fig. 3c, in the present embodiment, the second timing unit 171 includes the first reference frequency generating unit 174 and the second timing subunit 173, or includes the second reference frequency generating unit 178 and the second timing subunit 173, which are described in the first embodiment and are not described herein again.

In this embodiment, the second preset duration is adjustable, and for a specific adjustable manner, please refer to the first embodiment, which is not described herein again.

Third embodiment

Referring to fig. 7, fig. 7 is a partial circuit block diagram of a battery protection circuit 120 according to a third embodiment of the present application, which is similar to the first and second embodiments, so that the undescribed portions of the present embodiment can refer to the first and second embodiments, and the main difference between the present embodiment and the first and second embodiments is a logic control unit 150.

Referring to fig. 7, in the present embodiment, the logic control unit 150 includes an overdriving logic unit 152 and a battery logic unit 151. The battery logic unit 151 is electrically connected to the over-discharge voltage protection unit 131, the discharge over-current protection unit 134, the over-charge voltage protection unit 132, the charge over-current protection unit 133, and the like, that is, the battery logic unit 151 is the existing logic control unit 150 with the sleep mode, the battery logic unit 151 is also electrically connected to the control terminal of the second switch unit 140, and the battery logic unit 151 can control the second switch unit 140 to be turned on or off. In the present embodiment, the overdraw logic unit 152 is electrically connected to the secondary overdraw protection unit 160, specifically, to the output terminal of the overdraw comparison unit 161. In this embodiment, the output terminal of the overdriving logic unit 152 is electrically connected to the battery logic unit 151 or the overdischarging voltage protection unit 131, and the battery logic unit 151 is electrically connected to the control terminal of the second switch unit 140.

Referring to fig. 7, fig. 3c, and fig. 3d in combination, in the present embodiment, the overdriving logic unit 152 includes a second timing unit 171 and a second duration control unit 172, an input end of the second timing unit 171 is electrically connected to an output end of the overdriving comparison unit 161, an output end of the second timing unit 171 is electrically connected to the second duration control unit 172, and an output end of the second duration control unit 172 is electrically connected to the battery logic unit 151 or the overdischarging voltage protection unit 131.

In this embodiment, when the second duration control unit 172 learns that the duration of the first switching unit 210 being turned on is greater than or equal to the second preset duration, the second duration control unit 172 outputs a sleep signal to the battery logic unit 151 or outputs an overdischarge signal to the overdischarge voltage protection unit 131, the overdischarge voltage protection unit 131 outputs the sleep signal to the battery logic unit 151 after receiving the overdischarge signal, and the battery logic unit 151 controls the battery protection circuit 120 to enter a sleep mode and controls the second timing unit 171 to reset to zero. The second switching unit 140 remains off in the sleep mode to stop the battery 110 from supplying power to the atomizing assembly 200. Preferably, in the embodiment, at least a portion of the battery protection module 130 consumes no power (no leakage current is considered) in the sleep mode, for example, at least one of the overcharge voltage protection unit 132, the overdischarge voltage protection unit 131, the discharge overcurrent protection unit 134, the logic control unit 150, and the first reference voltage generation unit 138 consumes no power. Preferably, the entire battery protection module 130 does not consume power in the sleep mode (no leakage current is considered, and the sleep mode is not automatically exited). How the battery logic unit 151 enters the sleep mode after receiving the sleep signal is a conventional technique in the art, and is not described herein again. In this way, the battery protection module 130 includes a charging detection unit 139, the charging detection unit 139 is electrically connected to the system VM and the logic control unit 150, respectively, when the electronic cigarette is connected to the charger through the charging interface 260 for charging, the voltage of the system VM is pulled down (the second switch unit 140 is down) or pulled up (the second switch unit 140 is up), the charging detection unit 139 detects the charging signal, the battery protection circuit 120 may exit from the sleep mode, and the second switch unit 140 is turned back on.

Fourth embodiment

In the first to third embodiments, when the system control unit 220 drives the first switch unit 210 to operate through the PWM mode or the PFM mode, the PWM mode and the PFM mode include the on-time and the off-time in one cycle, the first switch unit 210 is turned on at the on-time and turned off at the off-time, and because only one second timing unit 171 is provided, the second timing unit 171 may have a problem (reset and clear at the off-time) when the first switch unit 210 is timed to operate, at this time, the two-stage over-suction protection mechanisms of the above three embodiments are no longer applicable, for example, when the one-stage over-suction protection fails or is damaged, and the system control unit 220 always drives the first switch unit 210 to operate due to long-time airflow flow, and effective two-stage protection for the electronic cigarette cannot be achieved. In order to thoroughly solve this problem, the present application provides a fourth embodiment, and parts not described in the present application may be referred to the first to third embodiments.

In the present embodiment, the first switching unit 210 may be driven by a PWM method or a PFM method. Referring to fig. 8, in the present embodiment, the overdriving logic unit 152 includes a second timing unit 171, a second duration control unit 172, a third timing unit 175 and a third duration control unit 176. An input end of the second timing unit 171 and an input end of the third timing unit 175 are electrically connected to an output end of the overdriving comparison unit 161, an output end of the second timing unit 171 is electrically connected to the second duration control unit 172, an output end of the second duration control unit 172 is electrically connected to a control end of the second switch unit 140, or is electrically connected to the battery logic unit 151, or is electrically connected to the overdischarging voltage protection unit 131, an output end of the third timing unit 175 is electrically connected to the third duration control unit 176, and an output end of the third duration control unit 176 is electrically connected to the second timing unit 171. In this embodiment, the second timing unit 171 triggers or clocks by a first type of edge, the third timing unit 175 triggers or clocks by a second type of edge or a second type of level, the third timing unit 175 stops clocking by a first type of edge or a first type of level, and the third duration control unit 176 controls whether the second timing unit 171 stops clocking.

Specifically, in the present embodiment, when an air flow flows, the air flow detecting element 240 is triggered, and the system control unit 220 drives the first switching unit 210 to operate through a PWM signal or a PFM signal, where the PWM signal and the PFM signal include an on time and an off time in one cycle. When the second switch unit 140 is turned on, the second stage overdriving protection unit 160 determines that the first detection voltage is greater than the first reference voltage Vref1 (taking the second switch unit 140 as an example), the overdriving comparison unit 161 outputs a first level signal, the second timing unit 171 starts timing, the second timing unit 171 outputs a timing duration to the second duration control unit 172, when the second stage overdriving protection unit 160 determines that the first detection voltage is lower than the first reference voltage Vref1, the overdriving comparison unit 161 outputs a second level signal, the third timing unit 175 starts timing, the third timing unit 175 outputs a timing duration to the third duration control unit 176, and when the on time of the next cycle is reached, the third timing unit 175 receives the first level signal output by the second stage overdriving protection unit 160 and triggers to stop timing, that is, the third timing unit 175 is used to time the duration of the turn-off time or the duration of the non-operation of the first switching unit 210. When the third duration control unit 176 receives a duration that the third timing unit 175 times is greater than or equal to a third preset duration, which indicates that the first switching unit 210 is in a non-operating state, that is, the received signal is not a PWM signal or a PFM signal, the third duration control unit 176 outputs a reset signal to the second timing unit 171, the second timing unit 171 stops timing and resets the timing duration to zero, when the third duration control unit 176 receives a duration that the third timing unit 175 times is less than the third preset duration, which indicates that the first switching unit 210 is driven by the PWM signal or the PFM signal, and only when the duration is in an off time, the third duration control unit 176 does not output the reset signal to the second timing unit 171, and the second timing unit 171 performs cumulative timing. When the second duration control unit 172 learns that the duration timed by the second timing unit 171 is greater than or equal to the second preset duration, the second duration control unit 172 outputs a secondary over-suction protection signal to control the second switch unit 140 to keep off, and after the second switch unit 140 is turned off, the main discharge loop is turned off, so that even if the first switch unit 210 is still turned on, the battery 110 will not supply power to the system control circuit, and therefore the heating element 250 will not be heated, and the temperature of the first switch unit 210 and the surrounding temperature thereof will not rise any more, which can prevent the first switch unit 210 or the system control module 272 from being damaged at high temperature to cause damage and aggravation of the electronic cigarette, especially, fire hazard will not occur. Moreover, the present embodiment utilizes the existing system side VM of the battery protection module 130, and the battery protection module 130 only needs to modify the internal circuit a little, so that the cost is low.

When the second switch unit 140 is turned off and stopped, the voltage of the system terminal VM is the voltage of the battery 110, and the first detection voltage is also the voltage of the battery 110, the overdriving comparison unit 161 continuously outputs the first level signal, so that the time length timed by the third timing unit 175 is 0, the time length timed by the third time length control unit 176 receiving the third timing unit 175 is always smaller than the third preset time length, so that the third time length control unit 176 does not output the reset signal to the second timing unit 171, the second timing unit 171 is always counting up, and the second time length control unit 172 continuously outputs the second overdriving protection signal to control the second switch unit 140 to be turned off. In addition, in other embodiments of the present application, when the second duration control unit 172 learns that the duration timed by the second timing unit 171 is greater than or equal to the second preset duration, the second duration control unit 172 outputs a sleep signal to the battery logic unit 151 or outputs an overdischarge signal to the overdischarge voltage protection unit 131, and the battery protection circuit 120 enters the sleep mode. In addition, in other embodiments of the present application, when the second switch unit 140 is disposed on top, it can be referred to the second embodiment and modified correspondingly at this time.

In this embodiment, after the user gets rid of the fault of the first switch unit 210 or the system control module 272 through maintenance, at this time, the voltage of the system terminal VM may be pulled down to make the overdriving comparison unit 161 output the second level signal, when the third duration control unit 176 receives the time duration counted by the third timing unit 175 is greater than or equal to the third preset time duration, the third duration control unit 176 outputs the reset signal to the second timing unit 171, the second timing unit 171 resets the time duration to zero and outputs the time duration to the second duration control unit 172, the second duration control unit 172 outputs the conducting signal to the second switch unit 140, and the second switch unit 140 is turned back on to realize reactivation. In this embodiment, the system side VM may be pulled down to a low level by connecting a charger. In addition, in other embodiments of the present application, the second duration control unit 172 may further output the conducting signal in a manner of a combination key, a physical switch, and the like, so that the second switch unit 140 is turned on again to realize reactivation, and a person skilled in the art may set the reactivation according to actual conditions.

In this embodiment, the third preset time period is greater than the maximum period of the PWM signal and the PFM signal, and the third preset time period is, for example, greater than or equal to 60ms, such as 60ms, 70ms, 80ms, 90ms, 100ms, 110ms, 120ms, 130ms, 140ms, 150ms, and the like. The present embodiment can solve various problems caused by the damage of the first switching unit 210 and the system control module 272.

The present embodiment can be applied to various ways (including but not limited to the above three ways) of driving the first switch unit 210 by the system control module 272. Specifically, when the system control unit 220 drives the heating element 250 to perform heating in the third driving manner (see the previous description of the present embodiment for the first driving manner and the second driving manner), the third timing unit 175 does not start timing, the timing period is always 0, the third period control unit 176 does not output the reset signal to the second timing unit 171 (the third period control unit 176 outputs the reset signal only when the first driving unit does not operate), the second timing unit 171 keeps counting time accumulatively, when the second duration control unit 172 learns that the duration clocked by the second timing unit 171 is greater than or equal to the second preset duration, the second duration control unit 172 outputs a secondary overdriving protection signal to turn off the second switching unit 140, or outputs a sleep signal to the battery logic unit 151 or outputs an overdischarge signal to the overdischarge voltage protection unit 131.

In this embodiment, when the airflow detection is repeatedly and falsely triggered, as long as the interval time is less than the third preset time, the second timing unit can always time, and when the timing time of the second timing unit is greater than or equal to the second preset time, the secondary over-suction protection can be triggered, so that the problem that the temperature of the first switch unit is continuously increased due to the fact that heat is not timely dissipated and smoking is performed again can be solved.

Referring to fig. 8, in the present embodiment, the second timing unit 171 includes a first reference frequency generating unit 174 and a second timing subunit 173, the third timing unit 175 includes a third timing subunit 177, and the second timing unit 171 and the third timing unit 175 share the first reference frequency generating unit 174, so that the cost can be reduced. The second timing subunit 173 and the third timing subunit 177 are electrically connected to the output end of the second-stage over-absorption protection unit 160, and in this embodiment, are electrically connected to the output end of the over-absorption comparison unit 161, the second timing subunit 173 is further electrically connected to the second duration control unit 172 and the first reference frequency generation unit 174, the third timing subunit 177 is further electrically connected to the third duration control unit 176 and the first reference frequency generation unit 174, and the third duration control unit 176 is electrically connected to the second timing subunit 173. In this embodiment, the first reference frequency generating unit 174 is always operated, when the first switching unit 210 is turned on, the second timing subunit 173 is triggered to receive the frequency signal output by the first reference frequency generating unit 174, the frequency signal is, for example, a pulse signal, a sawtooth wave signal, a triangular wave signal, etc., the second timing subunit 173 starts timing, when the first switching unit 210 is turned off, the third timing subunit 177 is triggered to receive the frequency signal output by the first reference frequency generating unit 174, the third timing subunit 177 starts timing, when the first switching unit 210 is turned on again, the third timing subunit 177 stops receiving the frequency signal output by the first reference frequency generating unit 174, the third timing subunit 177 stops timing and resets for zero, when the third duration control unit 176 receives the third timing subunit 177 for a duration greater than or equal to a third preset duration, the third duration control unit 176 outputs a reset signal to the second timing subunit 173, and the second timing subunit 173 resets to zero; when the third duration control unit 176 receives that the duration counted by the third timing subunit 177 is less than the third preset duration, the third timing subunit 177 does not output the reset signal. In other embodiments of the present application, the second timing unit 171 and the third timing unit 175 may not share the first reference frequency generating unit 174, and may each have one first reference frequency generating unit 174. In this embodiment, the second timing subunit 173 and the second duration control unit 172 may be combined into a circuit module, or may be separately implemented, and the third timing subunit 177 and the third duration control unit 176 may be combined into a circuit module, or may be separately implemented; the second timing subunit 173, the second duration control unit 172, the third timing subunit 177 and the third duration control unit 176 may also be combined in one circuit module.

In this embodiment, whether the electronic cigarette is operated or not, the first reference frequency generating unit 174 is operated all the time, so that the energy consumption is high, and in order to save the energy consumption, in other embodiments of the present application, please refer to fig. 9, the second timing unit 171 includes a second reference frequency generating unit 178 and a second timing subunit 173, the third timing unit 175 includes a third timing subunit 177, and the second timing unit 171 and the third timing unit 175 share one second reference frequency generating unit 178, so that the cost can be reduced. The second reference frequency generating unit 178 and the third timing subunit 177 are electrically connected to the output end of the second-stage over-absorption protection unit 160, and are electrically connected to the output end of the over-absorption comparison unit 161, the second timing subunit 173 and the third timing subunit 177 are electrically connected to the second reference frequency generating unit 178, the second timing subunit 173 is electrically connected to the second duration control unit 172, the third timing subunit 177 is electrically connected to the third duration control unit 176, and the third duration control unit 176 is electrically connected to the second reference frequency generating unit 178 and the second timing subunit 173. In this embodiment, the second reference frequency generating unit 178 operates when the first switching unit 210 operates, and does not operate after a delay for a period of time when the first switching unit 210 does not operate, and no frequency signal is generated, so that the power consumption can be reduced. In this embodiment, when the first switch unit 210 is turned on, the second reference frequency generating unit 178 is triggered to output a frequency signal, the second timing subunit 173 receives the frequency signal and starts timing, when the first switch unit 210 is turned off and turned off, the third timing subunit 177 is triggered to receive the frequency signal output by the second reference frequency generating unit 178, the third timing subunit 177 starts timing, when the first switch unit 210 is turned on again, the third timing subunit 177 stops receiving the frequency signal output by the second reference frequency generating unit 178, the third timing subunit 177 stops timing and resets to zero, when the third duration control unit 176 receives a duration that the third timing subunit 177 times is greater than or equal to a third preset duration, which indicates that the electronic cigarette is not operating, the third duration control unit 176 outputs a reset signal to the second timing subunit 173 and the second reference frequency generating unit 178, the second reference frequency generation unit 178 does not work any more, the second reference frequency generation unit 178 stops generating the frequency signal, and at the same time, the second timing subunit 173 is reset to zero; when the third duration control unit 176 receives that the duration counted by the third timing subunit 177 is less than the third preset duration, the third timing subunit 177 does not output the reset signal. In addition, in other embodiments of the present application, the third time duration control unit 176 may also be electrically connected to the second reference frequency generation unit 178 and not electrically connected to the second timing subunit 173, at this time, when the third time duration control unit 176 receives a time duration that is greater than or equal to a third preset time duration and is measured by the third timing subunit 177, it indicates that the electronic cigarette is not in operation, the third time duration control unit 176 outputs a reset signal to the second reference frequency generation unit 178, the second reference frequency generation unit 178 is not in operation, the second reference frequency generation unit 178 stops generating the frequency signal, the second timing subunit 173 does not receive the frequency signal, and the second timing subunit 173 automatically resets to zero. In other embodiments of the present application, the second timing unit 171 and the third timing unit 175 may not share the second reference frequency generation unit 178, and may each have one second reference frequency generation unit 178. In this embodiment, the second timing subunit 173 and the second duration control unit 172 may be combined into a circuit module, or may be separately implemented, and the third timing subunit 177 and the third duration control unit 176 may be combined into a circuit module, or may be separately implemented; the second timing subunit 173, the second duration control unit 172, the third timing subunit 177 and the third duration control unit 176 may also be combined in one circuit module.

In the first to fourth embodiments, the following problems can be at least partially solved by implementing the secondary over-smoking protection of the electronic cigarette by the battery protection circuit 120: the first switch unit 210 works for a long time, or the first switch unit 210 stops working for a short time, and the heat is not dissipated in time, so that the temperature rise of the first switch unit 210 is too high, the temperature inside the whole electronic cigarette is increased, the first switch unit 210 is deteriorated and damaged, and the peripheral circuit of the first switch unit 210 is also deteriorated and damaged, so that the electronic cigarette is seriously damaged. Moreover, by using the original second switch unit 140 of the battery protection circuit 120, an additional switch unit is not required to be added, so that the cost can be reduced; moreover, the existing system side VM of the battery protection circuit 120 is shared, the battery protection module 130 does not need to additionally add a terminal, the modification of the battery protection circuit 120 is less, and the cost and the design modification difficulty can be reduced.

Fifth embodiment

Referring to fig. 10a, fig. 10a is a circuit block diagram of an electronic cigarette according to a fifth embodiment of the present application, and this embodiment is similar to the first embodiment, so that the undescribed portions of this embodiment may refer to the first embodiment, and the main difference between this embodiment and the first embodiment is that a first detection resistor 191 is provided.

Referring to fig. 10a, in the present embodiment, the battery assembly 100 further includes a first detection resistor 191, the first detection resistor 191 is connected in series with the second switch unit 140 and the battery 110, and the first detection resistor 191 is located in the discharge main loop. In the present embodiment, a first terminal of the first detection resistor 191 is electrically connected to the negative electrode of the battery 110, that is, to the second ground terminal GND2, and a second terminal of the first detection resistor 191 is electrically connected to a first terminal of the second switching unit 140 or the system control circuit. In addition, in another embodiment of the present application, referring to fig. 10b, a first end of the first detection resistor 191 is electrically connected to the positive electrode of the battery 110, that is, electrically connected to the power supply terminal VDD, and a second end of the first detection resistor 191 is electrically connected to a first end of the second switch unit 140 or the system control circuit. In addition, in other embodiments of the present application, please refer to fig. 10c (the second switch unit 140 is disposed below) or fig. 10d (the second switch unit 140 is disposed above), a first end of the first detection resistor 191 is electrically connected to a second end of the second switch unit 140, that is, electrically connected to the system end VM, and a second end of the first detection resistor 191 is electrically connected to the system control circuit. In another embodiment of the present application, referring to fig. 10e, the second switch unit 140 is disposed and built-in, a first end of the first detection resistor 191 is electrically connected to the negative electrode of the battery 110, and a second end of the first detection resistor 191 is electrically connected to a first end of the second switch unit 140. In the present embodiment, the resistance of the first detecting resistor 191 is generally in the milli-ohm range, such as 1 milli-100 milli-ohm.

In this embodiment, when the first end of the first detection resistor 191 is electrically connected to the negative electrode of the battery 110, the voltage at the second end of the first detection resistor 191 is the voltage drop of the first detection resistor 191; when the first end of the first detection resistor 191 is electrically connected to the positive electrode of the battery 110, the voltage drop of the first detection resistor 191 is the voltage of the battery 110 minus the voltage of the second end of the first detection resistor 191; when the first end of the first detection resistor 191 is electrically connected to the second end of the second switch unit 140, the voltage drop of the first detection resistor 191 is obtained by subtracting the voltage of the system terminal VM from the voltage of the second end of the first detection resistor 191, or by subtracting the voltage of the second end of the first detection resistor 191 from the voltage of the system terminal VM.

In this embodiment, the battery protection module 130 includes a load detection unit, the load detection unit is configured to obtain a first detection voltage, the first detection voltage is configured to correspond to a current in a discharge main loop where the second switch unit 140 and the first detection resistor 191 are located, and the first detection voltage is capable of representing the current in the discharge main loop, for example, the first detection voltage and the current in the discharge main loop are in a linear relationship and may be represented by the following formula:

U=kI+b；

where U denotes a first detection voltage, I denotes a current flowing through the second switching unit 140 in the discharge main circuit, k is a constant different from 0, k may be positive or negative, and b is a constant.

In this embodiment, in the present embodiment, the first detection voltage is used to have a linear relationship with the voltage drop of the first detection resistor 191, for example, the first detection voltage is the voltage drop of the first detection resistor 191, and the ratio of the first detection voltage to the voltage drop of the first detection resistor 191 is 1: 1. Of course, in other embodiments, the voltage drop of the first detection resistor 191 may be converted to obtain the first detection voltage, and the ratio may not be 1:1, and may be set according to the user requirement.

In this embodiment, the load detection unit includes one current detection terminal CS, the current detection terminal CS is electrically connected to the second terminal of the first detection resistor 191, a voltage drop of the first detection resistor 191 is in a direct proportion relation with a current in the discharge main circuit, in this embodiment, the first detection voltage is a voltage drop of the first detection resistor 191, and in fig. 10a, the voltage drop of the first detection resistor 191 is a voltage of the current detection terminal CS. In addition, in other embodiments of the present application, the voltage of the current detection terminal CS may be used to determine the first detection voltage.

In this embodiment, how to perform the secondary over-suction protection after obtaining the first detection voltage may refer to the first to fourth embodiments, which are not described herein again.

In addition, in another embodiment of the present application, referring to fig. 10f, the number of the current detection terminals CS is not limited to one, and the number of the current detection terminals CS may also be two, which are respectively a first current detection terminal CS1 and a second current detection terminal CS2, wherein a first terminal of the first detection resistor 191 is electrically connected to the positive electrode of the battery 110, a first terminal of the first detection resistor 191 may further have other electronic components, a second terminal of the first detection resistor 191 is electrically connected to the system control circuit, the first current detection terminal CS1 is electrically connected to a first terminal of the first detection resistor 191, the second current detection terminal CS2 is electrically connected to a second terminal of the first detection resistor 191, a voltage drop of the first detection resistor 191 is a product of a current flowing through the discharge main circuit and a resistance of the first detection resistor 191, and the first detection voltage may be a voltage drop of the first detection resistor 191, i.e., equal to the voltage at the first current sensing terminal CS1 minus the voltage at the second current sensing terminal CS 2.

In addition, in other embodiments of the present application, the first detection resistor 191 may also be connected in series at other suitable positions of the discharge main loop, and those skilled in the art may set the first detection resistor according to actual needs.

Sixth embodiment

The first to fifth embodiments respectively detect the current flowing in the main discharging loop and convert the current into the first detection voltage, and determine whether the heating element 250 operates by comparing the first detection voltage with the first reference voltage Vref1, where the present embodiment detects the voltage drop of the second switch unit 140 and the voltage drop of the first detection resistor 191, and the present embodiment determines whether the first switch unit 210 is turned on or off by detecting whether the heating branch is turned on or not. For parts not described in this embodiment, refer to the first to fifth embodiments.

Referring to fig. 11, in the present embodiment, the first switch unit 210 is disposed on the top and the first switch unit 210 is disposed in the inside, in the present embodiment, a first end of the first switch unit 210 is electrically connected to the battery terminal BAT1, the battery terminal BAT1 is electrically connected to the positive electrode of the battery 110, or is electrically connected to the positive electrode of the battery 110 via the second switch unit 140, a second end of the first switch unit 210 is electrically connected to the atomization terminal AT, the atomization terminal AT is electrically connected to one end of the heating element 250, the other end of the heating element 250 is connected to the first ground GND1, the first ground GND1 is electrically connected to the negative electrode of the battery 110 via the second switch unit 140, or is electrically connected to the negative electrode of the battery 110, and the atomization terminal AT is a connection point (hereinafter referred to as an atomization connection point) between the first switch unit 210 and the heating element 250. In addition, in other embodiments of the present application, please refer to fig. 13, the first switch unit 210 is disposed on the upper portion and the first switch unit 210 is disposed on the outer portion, AT this time, the atomizing terminal AT may be disposed, or the atomizing terminal AT may not be disposed, and those skilled in the art may set the atomizing terminal AT as needed.

In this embodiment, when the first switch unit 210 is turned on, the voltage AT the connection point (atomization connection point) between the first switch unit 210 and the heating element 250 is the voltage of the battery terminal BAT1 minus the voltage drop of the first switch unit 210, the voltage AT the battery terminal BAT1 is the voltage of the battery 110 or the voltage of the system terminal VM, the voltage drops of the first switch unit 210 and the second switch unit 140 are generally in the millivolt level, the voltage AT the atomization connection point is generally greater than 3.2V, and the voltage AT the atomization terminal AT is greater; when the first switch unit 210 is turned off, the voltage AT the connection point between the first switch unit 210 and the heating element 250 is the voltage of the first ground GND1, the voltage of the first ground GND1 is 0 or the voltage of the system terminal VM, which is generally 0 or microvolt, the voltage AT the atomization connection point is generally less than 0.5V, and the voltage AT the atomization terminal AT is smaller. Therefore, whether the heating branch is turned on or off can be determined by determining the voltage at the connection point of the first switching unit 210 and the heating element 250, and further, whether the heating element 250 is heating is determined by determining whether the first switching unit 210 is turned on or off. In this embodiment, the voltages at the atomization connection point when the first switch is turned on and off are greatly different.

In this embodiment, the battery protection module 130 includes a branch detection unit, and the branch detection unit is configured to obtain a second detection voltage, where the second detection voltage is used to represent whether the heating branch is turned on. In this embodiment, the branch detection unit includes a heating detection terminal GX, the heating detection terminal GX is added to the battery protection module 130, the heating detection terminal GX and a connection point (atomization connection point) of the first switch unit 210 and the heating element 250 are electrically connected, in this embodiment, the heating detection terminal GX is electrically connected to the atomization terminal AT, and a voltage of the heating detection terminal GX is used to determine the second detection voltage. In this embodiment, the voltage of the heat generation detecting terminal GX is the second detecting voltage, but in other embodiments, the voltage of the heat generation detecting terminal GX may be converted to obtain the second detecting voltage. In this embodiment, the battery protection module 130 can determine whether the heating branch is turned on by detecting the voltage of the atomization connection point through the heating detection terminal GX, and further determine whether the heating element 250 is heating.

Referring to fig. 12a, 12b, and 12c, in the present embodiment, the battery protection module 130 further includes a secondary over-suction protection unit 160, and the secondary over-suction protection unit 160 is electrically connected to the heat generation detection terminal GX and the logic control unit 150, respectively. In this embodiment, the secondary overdriving protection unit 160 includes an overdriving comparison unit 161, and the overdriving comparison unit 161 is, for example, a voltage comparator. One input terminal of the overdriving comparison unit 161 is electrically connected to the heat generation detection terminal GX, the other input terminal of the overdriving comparison unit 161 is electrically connected to the first reference voltage generation unit 138, the first reference voltage generation unit 138 generates the third reference voltage Vref3 and inputs the third reference voltage to the overdriving comparison unit 161, in this embodiment, the third reference voltage Vref3 is generally between 0.5V and 3.2V, such as 0.5V, 1V, 1.5V, 2V, 2.5V, 3V, 3.2V, etc. In this embodiment, when the first switch unit 210 is turned off, the heat-generating branch is turned off, and the voltage of the heat-generating detection terminal GX is equal to the voltage of the first ground terminal GND1 and is less than the third reference voltage Vref3, that is, the second detection voltage is less than the third reference voltage Vref3, and the over-suction comparing unit 161 outputs a second level signal; when the first switch unit 210 is turned on, the heat-generating branch is turned on, and at this time, the voltage of the heat-generating detection terminal GX is close to the voltage of the battery terminal BAT1 (other elements, such as a detection resistor and the like, may be added between the battery terminal BAT1 and the heat-generating detection terminal GX except for the first switch unit 210), and is greater than the third reference voltage Vref3, that is, the second detection voltage is greater than the third reference voltage Vref3, and the over-absorption comparison unit 161 outputs the first level signal. In this embodiment, the first level signal is at a high level or a low level, and the second level signal is at a low level or a high level.

Referring to fig. 12b, in the present embodiment, the logic control unit 150 includes an over-absorbing logic unit 152 and a battery logic unit 151, wherein the battery logic unit 151 is electrically connected to the over-discharging voltage protection unit 131, the discharging over-current protection unit 134, the over-charging voltage protection unit 132, the charging over-current protection unit 133, and the like, the battery logic unit 151 is further electrically connected to a control terminal of the second switch unit 140, and the battery logic unit 151 can control the second switch unit 140 to be turned on or off. In this embodiment, the overdriving logic unit 152 is electrically connected to the secondary overdriving protection unit 160, specifically, to the output terminal of the overdriving comparison unit 161, and the overdriving logic unit 152 is electrically connected to the battery logic unit 151 or the overdischarging voltage protection unit 131. In addition, in other embodiments of the present application, referring to fig. 3b, an input end of the secondary over-suction protection unit 160 is electrically connected to the heating detection end GX, an output end of the secondary over-suction protection unit 160 is electrically connected to the over-suction logic unit 152, and the over-suction logic unit 152 is electrically connected to a control end of the second switch unit 140 to control the second switch unit 140 to be turned on or off.

Referring to fig. 12b and 12c, in the present embodiment, the overdriving logic unit 152 includes a second timing unit 171, a second duration control unit 172, a third timing unit 175 and a third duration control unit 176, and the connection relationship and the function of the second timing unit 171, the second duration control unit 172, the third timing unit 175 and the third duration control unit 176 refer to the foregoing embodiments and are not described herein again. In addition, in other embodiments of the present application, please refer to fig. 3c and fig. 3d, the third timing unit 175 and the third duration control unit 176 may not be included (please refer to the first to third embodiments). The working principle and function of the second-level overdriving protection unit 160 and the overdriving logic unit 152 in this embodiment can be referred to the previous embodiments, and are not described herein again.

In this embodiment, when the second duration control unit 172 knows that the duration timed by the second timing unit 171 is greater than or equal to the second preset duration, the second duration control unit 172 outputs a sleep signal to the battery logic unit 151, or outputs an overdischarge signal to the overdischarge voltage protection unit 131, the overdischarge voltage protection unit 131 outputs a sleep signal to the battery logic unit 151, and the battery logic unit 151 controls the battery protection circuit 120 to enter a sleep mode, and simultaneously controls the second timing unit 171 to reset to zero. The second switching unit 140 remains off in the sleep mode to stop the battery 110 from supplying power to the atomizing assembly 200. Preferably, at least some of the cells of the battery protection module 130 consume no power in the sleep mode (regardless of leakage current). Preferably, the entire battery protection module 130 does not consume power in the sleep mode (no leakage current is considered). In addition, in other embodiments of the present application, when the second duration control unit 172 learns that the duration timed by the second timing unit 171 is greater than or equal to the second preset duration, the second duration control unit 172 outputs a secondary over-suction protection signal to control the second switch unit 140 to keep turning off, which may specifically refer to the foregoing embodiments and is not described herein again.

In this embodiment, the second timing unit 171 includes a first reference frequency generating unit 174 and a second timing subunit 173, and the third timing unit 175 includes a third timing subunit 177, or the second timing unit 171 includes a second reference frequency generating unit 178 and a second timing subunit 173, and the third timing unit 175 includes a third timing subunit 177, which are described in detail in the previous embodiments and are not described herein again.

In this embodiment, the second preset time period is adjustable, and for a specific adjustable manner, please refer to the previous embodiment, which is not described herein again.

Seventh embodiment

Referring to fig. 14, fig. 14 is a circuit block diagram of an electronic cigarette according to a seventh embodiment of the present application, which is similar to the sixth embodiment, so that the undescribed portion of the present embodiment can refer to the sixth embodiment, and the main difference between the present embodiment and the sixth embodiment is that the first switch unit 210 is disposed below.

Referring to fig. 14, in the present embodiment, the first switch unit 210 is disposed below and the first switch unit 210 is disposed inside, in the present embodiment, a first end of the first switch unit 210 is electrically connected to a first ground GND1, the first ground GND1 is electrically connected to a negative electrode of the battery 110 or a negative electrode of the battery 110 via the second switch unit 140, a second end of the first switch unit 210 is electrically connected to an atomization end AT, the atomization end AT is electrically connected to one end of the heating element 250, the other end of the heating element 250 is electrically connected to a battery end BAT1, the battery end BAT1 is electrically connected to a positive electrode of the battery 110 or is electrically connected to a positive electrode of the battery 110 via the second switch unit 140, and the atomization end AT is a connection point (hereinafter referred to as an atomization connection point) between the first switch unit 210 and the heating element 250. In addition, in other embodiments of the present application, please refer to fig. 15, the first switch unit 210 is disposed below and the first switch unit 210 is disposed outside, and AT this time, the atomization end AT may be disposed, or may not be disposed, and those skilled in the art perform the setting according to the needs.

In this embodiment, when the first switch unit 210 is turned on, the voltage of the connection point (atomization connection point) between the first switch unit 210 and the heating element 250 is close to the voltage of the first ground GND1, specifically, the voltage of the first ground GND1 is added to the voltage drop of the first switch unit 210, the voltage of the first ground GND1 is the voltage of the system terminal VM or 0, and the voltage drop of the first switch unit 210 and the voltage drop of the second switch unit 140 are both generally in the millivolt level, so that the voltage of the atomization end AT is in the millivolt level, the voltage of the atomization connection point is generally less than 0.5V, and the voltage of the atomization end AT is smaller; when the first switch unit 210 is turned off, the voltage AT the connection point between the first switch unit 210 and the heating element 250 is the voltage of the battery terminal BAT1, the voltage of the battery terminal BAT1 is the voltage of the system terminal VM or the voltage of the positive electrode of the battery 110, the voltage drop of the second switch unit 140 is generally in the microvolt level, the voltage AT the atomization connection point is generally greater than 3.2V, and the voltage AT the atomization end AT is relatively large. Therefore, whether the heating branch is turned on or off can be determined by determining the voltage at the connection point of the first switching unit 210 and the heating element 250, and further, whether the heating element 250 is heating or not is determined by determining whether the first switching unit 210 is turned on or off. In this embodiment, the voltages at the atomization connection point when the first switch is turned on and off are very different.

In this embodiment, the battery protection module 130 includes a branch detection unit, and the branch detection unit is configured to obtain a second detection voltage, where the second detection voltage is used to represent whether the heating branch is turned on. In this embodiment, the branch detection unit includes a heating detection terminal GX, the heating detection terminal GX is added to the battery protection module 130, the heating detection terminal GX and a connection point (atomization connection point) of the first switch unit 210 and the heating element 250 are electrically connected, in this embodiment, the heating detection terminal GX is electrically connected to the atomization terminal AT, and a voltage of the heating detection terminal GX is used to determine the second detection voltage. In this embodiment, the voltage of the heat generation detecting terminal GX is the second detecting voltage, but in other embodiments, the voltage of the heat generation detecting terminal GX may be converted to obtain the second detecting voltage. In this embodiment, the battery protection module 130 can determine whether the heating branch is turned on by detecting the voltage at the atomization connection point through the heating detection terminal GX, and further determine whether the heating element 250 is heating.

Referring to fig. 12a, 12b, and 12c, in the present embodiment, the battery protection module 130 further includes a secondary over-suction protection unit 160, and the secondary over-suction protection unit 160 is electrically connected to the heat generation detection terminal GX and the logic control unit 150, respectively. In this embodiment, the secondary overdraw protection unit 160 includes an overdraw comparison unit 161, and the overdraw comparison unit 161 is, for example, a voltage comparator. One input terminal of the overdriving comparison unit 161 is electrically connected to the heat generation detection terminal GX, the other input terminal of the overdriving comparison unit 161 is electrically connected to the first reference voltage generation unit 138, the first reference voltage generation unit 138 generates a fourth reference voltage Vref4 and inputs the fourth reference voltage to the overdriving comparison unit 161, and in this embodiment, the fourth reference voltage Vref4 is generally between 0.5V and 3.2V, such as 0.5V, 1V, 1.5V, 2V, 2.5V, 3V, 3.2V, etc. In this embodiment, when the first switch unit 210 is turned off, the heat-generating branch is turned off, and at this time, the voltage of the heat-generating detection terminal GX is equal to the voltage of the battery terminal BAT1 and is greater than the fourth reference voltage Vref4, that is, the second detection voltage is greater than the fourth reference voltage Vref4, and the over-suction comparison unit 161 outputs a second level signal; when the first switch unit 210 is turned on, the heat-generating branch is turned on, and at this time, the voltage of the heat-generating detection terminal GX is close to the voltage of the first ground GND1 (other elements, such as a detection resistor, may be added between the first ground GND1 and the heat-generating detection terminal GX besides the first switch unit 210), and is less than the fourth reference voltage Vref4, that is, the second detection voltage is less than the fourth reference voltage Vref4, and the over-absorption comparison unit 161 outputs the first level signal. In this embodiment, the first level signal is at a high level or a low level, and the second level signal is at a low level or a high level.

Referring to fig. 12b and 12c, in the present embodiment, the overdriving logic unit 152 includes a second timing unit 171, a second duration control unit 172, a third timing unit 175 and a third duration control unit 176, and the connection relationship and the function of the second timing unit 171, the second duration control unit 172, the third timing unit 175 and the third duration control unit 176 refer to the foregoing embodiments and are not described herein again. In addition, in other embodiments of the present application, please refer to fig. 3c and fig. 3d, the third timing unit 175 and the third duration control unit 176 may not be included (please refer to the first to third embodiments). The working principle of the second-level over-suction protection unit 160 and the over-suction logic unit 152 in this embodiment can be referred to the previous embodiments, and will not be described herein again.

In this embodiment, when the second duration control unit 172 knows that the duration timed by the second timing unit 171 is greater than or equal to the second preset duration, the second duration control unit 172 outputs a sleep signal to the battery logic unit 151, or outputs an overdischarge signal to the overdischarge voltage protection unit 131, the overdischarge voltage protection unit 131 outputs a sleep signal to the battery logic unit 151, and the battery logic unit 151 controls the battery protection circuit 120 to enter a sleep mode, and simultaneously controls the second timing unit 171 to reset to zero. The second switching unit 140 remains off in the sleep mode to stop the battery 110 from supplying power to the atomizing assembly 200. Preferably, in the present embodiment, at least a portion of the cells of the battery protection module 130 consume no power in the sleep mode (no consideration of leakage current). Preferably, the entire battery protection module 130 does not consume power in the sleep mode (no leakage current is considered). In addition, in other embodiments of the present application, when the second duration control unit 172 learns that the duration timed by the second timing unit 171 is greater than or equal to the second preset duration, the second duration control unit 172 outputs a secondary over-suction protection signal to control the second switch unit 140 to keep turning off, which may specifically refer to the foregoing embodiments and is not described herein again.

In this embodiment, the second preset duration is adjustable, and for a specific adjustable manner, please refer to the previous embodiment, which is not described herein again.

Eighth embodiment

Fig. 16a is a circuit block diagram of an electronic cigarette according to an eighth embodiment of the present application, and this embodiment is similar to the sixth embodiment, so that the parts not described in this embodiment can refer to the sixth embodiment, and the main difference between this embodiment and the sixth embodiment is that whether the first switch unit 210 is turned on or not is not determined by the voltage of the atomization end AT.

Referring to fig. 16a, in the present embodiment, the atomizing assembly 200 further includes a second detecting resistor 271, the first switch unit 210 and the heating element 250 are connected in series to form a heating branch, and the resistance of the second detecting resistor 271 is generally in the milliohm range, for example, 1 milliohm to 100 milliohm.

In the present embodiment, the first switch unit 210 is disposed on the top and the first switch unit 210 is disposed inside. In the present embodiment, the first terminal of the first switch unit 210 is electrically connected to the battery terminal BAT1, the battery terminal BAT1 is electrically connected to the positive electrode of the battery 110, or is electrically connected to the positive electrode of the battery 110 via the second switch unit 140, the second terminal of the first switch unit 210 is electrically connected to the atomization terminal AT, the atomization terminal AT is electrically connected to one terminal of the heating element 250, the other terminal of the heating element 250 is connected to one terminal of the second detection resistor 271, the other terminal of the second detection resistor 271 is connected to the first ground terminal GND1, and the first ground terminal GND1 is electrically connected to the negative electrode of the battery 110 via the second switch unit 140, or is electrically connected to the negative electrode of the battery 110. In addition, in other embodiments of the present application, the positions of the second detection resistor 271 and the heating element 250 may be exchanged.

Referring to fig. 16a, in this embodiment, the battery protection module 130 further includes a branch detection unit and a secondary over-suction protection unit 160, the branch detection unit is electrically connected to the heating branch, the branch detection unit is configured to obtain a second detection voltage, and the second detection voltage is used to indicate whether the heating branch is turned on. In this embodiment, the second detection voltage is one value when the heating branch is turned on, and the second detection voltage is another different value when the heating branch is turned off. In this embodiment, the secondary overdriving protection unit 160 is electrically connected to the branch detection unit and the logic control unit 150, respectively.

In this embodiment, the branch detection unit includes a heating detection terminal GX, the heating detection terminal GX is added to the battery protection module 130, the heating detection terminal GX is electrically connected to a connection portion of the second detection resistor 271 and the heating element 250, and a voltage of the heating detection terminal GX is used to determine the second detection voltage. In this embodiment, the voltage of the heat generation detecting terminal GX is the second detecting voltage, but in other embodiments, the voltage of the heat generation detecting terminal GX may be converted to obtain the second detecting voltage. In the present embodiment, the heat generation detecting terminal GX is electrically connected to one input terminal of the overdriving comparing unit 161 of the unit of the secondary overdriving protection, the other input terminal of the overdriving comparing unit 161 is electrically connected to the first reference voltage generating unit 138, and the first reference voltage generating unit 138 is configured to generate the third reference voltage Vref 3.

In this embodiment, when an airflow flows, the airflow detecting element 240 is triggered, the first switch unit 210 is turned on, and at this time, the current on the heat generating branch is large and is in an ampere level, for example, 0.5A, 1A, 2A, and the like, the voltage of the heat generating detecting terminal GX is the sum of the voltage of the first ground terminal GND1 and the voltage drop of the second detecting resistor 271, and the voltage drop of the second switch unit 140 and the voltage drop of the second detecting resistor 271 are generally in a millivolt level; when no airflow flows or the switch-off time is set, the first switch unit 210 is turned off, no current flows through the heat branch, the voltage of the heat detection terminal GX is equal to the voltage of the first ground terminal GND1, and the voltage drop of the second switch unit 140 is typically in the microvolt level. In the embodiment, the third reference voltage Vref3 is greater than the voltage of the first ground GND1 when the first switch unit 210 is turned off, and is less than the voltage of the first ground GND1 plus the voltage drop of the second detection resistor 271 when the first switch unit 210 is turned on. Therefore, whether the first switch unit 210 is turned on or not can be known by determining the voltage of the heat generation detecting terminal GX.

In this embodiment, how to trigger the secondary over-suction protection after the over-suction comparing unit 161 obtains the voltage of the heat-generating detecting terminal GX and the third reference voltage Vref3 may refer to the foregoing embodiments, and details thereof are not repeated herein.

In addition, the position of the second detecting resistor 271 is not limited to that shown in fig. 16a, and in another embodiment of the present application, please refer to fig. 16b, the first switch unit 210 is disposed on top, and the first switch unit 210 is disposed on the outside. In this embodiment, one end of the second detection resistor 271 is electrically connected to the battery terminal BAT1, the battery terminal BAT1 is electrically connected to the positive electrode of the battery 110, or is electrically connected to the positive electrode of the battery 110 via the second switch unit 140, the other end of the second detection resistor 271 is electrically connected to the first end of the first switch unit 210, the second end of the first switch unit 210 is electrically connected to the atomization terminal AT, the atomization terminal AT is electrically connected to one end of the heating element 250, the other end of the heating element 250 is electrically connected to the first ground GND1, and the first ground GND1 is electrically connected to the negative electrode of the battery 110 via the second switch unit 140, or is electrically connected to the negative electrode of the battery 110. In the present embodiment, the heat generation detection terminal GX is electrically connected to a connection point of the first switch unit 210 and the second detection resistor 271, and a voltage of the heat generation detection terminal GX is used to determine the second detection voltage, for example, the voltage of the heat generation detection terminal GX is the second detection voltage. When the first switch unit 210 is turned on, the current on the heat-generating branch is greater at the ampere level, for example, 0.5A, 1A, 2A, etc., the voltage of the heat-generating detection terminal GX is the voltage of the battery terminal BAT1 minus the voltage drop of the second detection resistor 271, and the voltage drop of the second switch unit 140 and the voltage drop of the second detection resistor 271 are generally at the millivolt level; when the first switch unit 210 is turned off, no current flows through the heat-generating branch, the voltage of the heat-generating detection terminal GX is equal to the voltage of the battery terminal BAT1, and the voltage drop of the second switch unit 140 is generally in the microvolt level. In this embodiment, one input terminal of the overdriving comparison unit 161 is electrically connected to the heat generation detection terminal GX, and the other input terminal is connected to the fourth reference voltage Vref 4. In this embodiment, the fourth reference voltage Vref4 is smaller than the voltage of the battery terminal BAT1 when the first switch unit 210 is turned off, and is larger than the voltage drop of the battery terminal BAT1 minus the voltage drop of the second detection resistor 271 when the first switch unit 210 is turned on. Therefore, whether the first switch unit 210 is turned on or not can be known by determining whether the voltage of the heating detection terminal GX is greater than the fourth reference voltage Vref4, and further whether the heating branch is turned on or not can be known. In addition, in other embodiments of the present application, the positions of the second detection resistor 271 and the first switch unit 210 may be exchanged. The on-resistance of the first switching unit 210 is generally in the milliohm range.

In addition, the position of the second detecting resistor 271 is not limited to that shown in fig. 16a, and in another embodiment of the present application, please refer to fig. 16c, the first switch unit 210 is disposed downward and the first switch unit 210 is disposed inward. In this embodiment, one end of the second detection resistor 271 is electrically connected to the battery terminal BAT1, the battery terminal BAT1 is electrically connected to the positive electrode of the battery 110, or is electrically connected to the positive electrode of the battery 110 via the second switch unit 140, the other end of the second detection resistor 271 is electrically connected to one end of the heating element 250, the other end of the heating element 250 is connected to the atomization terminal AT, the atomization terminal AT is electrically connected to one end of the first switch unit 210, the other end of the first switch unit 210 is electrically connected to the first ground GND1, and the first ground GND1 is electrically connected to the negative electrode of the battery 110 via the second switch unit 140, or is electrically connected to the negative electrode of the battery 110. In the present embodiment, the heat generation detecting terminal GX is electrically connected to the connection between the heat generating element 250 and the second detecting resistor 271, and the voltage of the heat generation detecting terminal GX is used to determine the second detecting voltage, for example, the voltage of the heat generation detecting terminal GX is the second detecting voltage. In this embodiment, when the first switch unit 210 is turned on, the current on the heating branch is at an ampere level, the voltage of the heating detection terminal GX is obtained by subtracting the voltage drop of the second detection resistor 271 from the voltage of the battery terminal BAT1, and the voltage drop of the second switch unit 140 and the voltage drop of the second detection resistor 271 are generally at a millivolt level; when the first switch unit 210 is turned off, no current flows through the heat-generating branch, the voltage of the heat-generating detection terminal GX is equal to the voltage of the battery terminal BAT1, and the voltage drop of the second switch unit 140 is generally in the microvolt level. In this embodiment, one input terminal of the overdriving comparison unit 161 is electrically connected to the heat generation detection terminal GX, and the other input terminal is connected to the fourth reference voltage Vref 4. In this embodiment, the fourth reference voltage Vref4 is smaller than the voltage of the battery terminal BAT1 when the first switch unit 210 is turned off, and is larger than the voltage of the battery terminal BAT1 minus the voltage drop of the second detection resistor 271 when the first switch unit 210 is turned on. Accordingly, whether the first switching unit 210 is turned on can be known by determining whether the voltage of the heat generation detecting terminal GX is greater than the fourth reference voltage Vref 4. In addition, in other embodiments of the present application, the positions of the second detection resistor 271 and the heating element 250 may be exchanged.

In addition, the position of the second detecting resistor 271 is not limited to that shown in fig. 16a, and in another embodiment of the present application, please refer to fig. 16d, the first switch unit 210 is disposed downward and the first switch unit 210 is disposed outward. In the present embodiment, one end of the heating element 250 is electrically connected to the battery terminal BAT1, the battery terminal BAT1 is electrically connected to the positive electrode of the battery 110, or is electrically connected to the positive electrode of the battery 110 via the second switch unit 140, the other end of the heating element 250 is connected to the atomization terminal AT, the atomization terminal AT is electrically connected to one end of the first switch unit 210, the other end of the first switch unit 210 is electrically connected to one end of the second detection resistor 271, the other end of the second detection resistor 271 is electrically connected to the first ground GND1, and the first ground GND1 is electrically connected to the negative electrode of the battery 110 via the second switch unit 140, or is electrically connected to the negative electrode of the battery 110. In the present embodiment, the heat generation detection terminal GX is electrically connected to a connection point of the first switch unit 210 and the second detection resistor 271, and a voltage of the heat generation detection terminal GX is used to determine the second detection voltage, for example, the voltage of the heat generation detection terminal GX is the second detection voltage. In this embodiment, when the first switch unit 210 is turned on, the current on the heat-generating branch is at an ampere level, the voltage of the heat-generating detection terminal GX is the sum of the voltage of the first ground terminal GND1 and the voltage drop of the second detection resistor 271, and the voltage drop of the second switch unit 140 and the voltage drop of the second detection resistor 271 are generally at a millivolt level; when the first switch unit 210 is turned off, no current flows through the heat branch, and the voltage of the heat detection terminal GX is equal to the voltage of the first ground GND1, and the voltage drop of the second switch unit 140 is typically in microvolts. In this embodiment, one input terminal of the overdriving comparison unit 161 is electrically connected to the heat generation detection terminal GX, and the other input terminal is connected to the third reference voltage Vref 3. Thus, the third reference voltage Vref3 is less than the voltage of the first ground GND1 plus the voltage drop of the second sensing resistor 271 when the first switch unit 210 is turned on, and greater than the voltage of the first ground GND1 when the first switch unit 210 is turned off. Accordingly, whether the first switching unit 210 is turned on can be known by determining whether the voltage of the heat generation detecting terminal GX is greater than the third reference voltage Vref 3. In addition, in other embodiments of the present application, the positions of the second detection resistor 271 and the first switch unit 210 may be exchanged.

In addition, in other embodiments of the present application, the second detection resistor 271 may also be connected in series to other suitable positions of the heat generating branch, and those skilled in the art may set the second detection resistor according to actual needs.

Ninth embodiment

Referring to fig. 17, fig. 17 is a circuit block diagram of an electronic cigarette according to a ninth embodiment of the present application, and this embodiment is similar to the sixth embodiment, so that the undescribed parts of this embodiment can refer to the sixth embodiment, and the main difference between this embodiment and the sixth embodiment is that the heating detection terminal GX is electrically connected to the control terminal of the first switch unit 210.

Generally, when the first switch unit 210 is PMOS (the present embodiment takes PMOS transistor as an example for illustration), the control terminal of the first switch unit 210 is driven by a lower voltage to turn on, such as the voltage of the first ground GND1, and the control terminal of the first switch unit 210 is driven by a higher voltage to turn off, such as the voltage of the battery terminal BAT 1. When the first switch unit 210 is an NMOS, the control terminal of the first switch unit 210 is driven by a higher voltage to turn on, such as the voltage of the battery terminal BAT1, and the control terminal of the first switch unit 210 is driven by a lower voltage to turn off, such as the voltage of the battery terminal BAT 1. Thus, a voltage at which the first switching unit 210 is generally driven to be turned on or turned off is determined.

Referring to fig. 17, in the present embodiment, the battery protection module 130 includes a branch detection unit, where the branch detection unit is configured to obtain a second detection voltage, and the second detection voltage is used to represent whether the heating branch is turned on. In this embodiment, the branch detecting unit includes a heating detecting terminal GX, the heating detecting terminal GX is electrically connected to the control terminal of the first switching unit 210, and a voltage of the heating detecting terminal GX is used to determine the second detecting voltage. In this embodiment, the voltage of the heat generation detecting terminal GX is the second detecting voltage, but in other embodiments, the voltage of the heat generation detecting terminal GX may be converted to obtain the second detecting voltage. In this embodiment, the voltage of the control terminal of the first switch unit 210 can be directly obtained through the heating detection terminal GX, so as to determine whether the first switch unit 210 is turned on or not and whether the heating branch is turned on or not. In the embodiment, the system control module 272 includes a first switch control terminal GT (pin) regardless of whether the first switch unit 210 is built-in or external, the first switch control terminal GT is electrically connected to the control terminal of the first switch unit 210, and the heat generation detection terminal GX is electrically connected to the first switch control terminal GT.

Referring to fig. 12a, fig. 12b, fig. 12c and fig. 17, in the present embodiment, the battery protection module 130 further includes a secondary over-suction protection unit 160, and the secondary over-suction protection unit 160 is electrically connected to the heat generation detection terminal GX and the logic control unit 150, respectively. In this embodiment, the secondary overdriving protection unit 160 includes an overdriving comparison unit 161, and the overdriving comparison unit 161 is, for example, a voltage comparator. One input end of the overdriving comparison unit 161 is electrically connected to the heat generation detection end GX, the other input end of the overdriving comparison unit 161 is electrically connected to the first reference voltage generation unit 138, the first reference voltage generation unit 138 generates the fourth reference voltage Vref4 and inputs the fourth reference voltage to the overdriving comparison unit 161, in this embodiment, the fourth reference voltage Vref4 is generally between 0.5V and 2V, and may be set according to actual needs, such as 0.5V, 1V, 1.5V, 2V, and the like. In this embodiment, when the first switch unit 210 is turned off, the heat generating branch is turned off, and the voltage of the heat generating detection terminal GX is greater than the fourth reference voltage Vref4, the overdriving comparison unit 161 outputs the second level signal, when the first switch unit 210 is turned on, the heat generating branch is turned on, and the voltage of the heat generating detection terminal GX is less than the fourth reference voltage Vref4, and the overdriving comparison unit 161 outputs the first level signal. In this embodiment, the first level signal is at a high level or a low level, and the second level signal is at a low level or a high level. In addition, in other embodiments of the present application, when the first switch unit 210 is an NMOS transistor, another input terminal of the overdriving comparison unit 161 is connected to the third reference voltage Vref3, the third reference voltage Vref3 is generally between 0.5V and 2V, but may also be set according to actual requirements, for example, 0.5V, 1V, 1.5V, 2V, and the like, at this time, when the first switch unit 210 is turned off and turned off, the heat-generating branch is turned off, at this time, the voltage of the heat-generating detection terminal GX is smaller than the third reference voltage Vref3, the overdriving comparison unit 161 outputs the second level signal, when the first switch unit 210 is turned on, the heat-generating branch is turned on, at this time, the voltage of the heat-generating detection terminal GX is greater than the third reference voltage Vref3, and the overdriving comparison unit 161 outputs the first level signal.

Referring to fig. 12b and 12c, in the present embodiment, the overdriving logic unit 152 includes a second timing unit 171, a second duration control unit 172, a third timing unit 175 and a third duration control unit 176, and the connection relationship and the function of the second timing unit 171, the second duration control unit 172, the third timing unit 175 and the third duration control unit 176 refer to the foregoing embodiments and are not described herein again. In addition, in other embodiments of the present application, please refer to fig. 3c and 3d, the third timing unit 175 and the third duration control unit 176 may not be included. The working principle and function of the second-level overdriving protection unit 160 and the overdriving logic unit 152 in this embodiment can be referred to the previous embodiments, and are not described herein again.

In this embodiment, when the second duration control unit 172 knows that the duration timed by the second timing unit 171 is greater than or equal to the second preset duration, the second duration control unit 172 outputs a sleep signal to the battery logic unit 151, or outputs an overdischarge signal to the overdischarge voltage protection unit 131, the overdischarge voltage protection unit 131 outputs a sleep signal to the battery logic unit 151, and the battery logic unit 151 controls the battery protection circuit 120 to enter a sleep mode, and simultaneously controls the second timing unit 171 to reset to zero. The second switching unit 140 remains off in the sleep mode to stop the battery 110 from supplying power to the atomizing assembly 200. Preferably, at least a portion of the cells of the battery protection module 130 consume no power (regardless of leakage current) during the sleep mode. Preferably, the entire battery protection module 130 does not consume power in the sleep mode (no leakage current is considered). In addition, in other embodiments of the present application, when the second duration control unit 172 learns that the duration timed by the second timing unit 171 is greater than or equal to the second preset duration, the second duration control unit 172 outputs a secondary over-suction protection signal to control the second switch unit 140 to keep turning off, which may specifically refer to the foregoing embodiments and is not described herein again.

It should be understood that reference to "a plurality" herein means two or more. Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present application and should not be taken as limiting the scope of the present application, so that the present application will be covered by the appended claims.

Claims

1. A battery protection circuit applied to an electronic cigarette is characterized by comprising a battery protection module and a second switch unit, wherein the battery protection module comprises a power supply end, a second grounding end, an over-discharge voltage protection unit, a discharge over-current protection unit, a first reference voltage generation unit and a logic control unit, the power supply end and the second grounding end are correspondingly and electrically connected with two ends of a battery, the logic control unit is respectively and electrically connected with the over-discharge voltage protection unit and the discharge over-current protection unit, a control end of the second switch unit is electrically connected with the logic control unit, a first end of the second switch unit is electrically connected with the battery, and a second end of the second switch unit is electrically connected with an atomization assembly;

2. The battery protection circuit according to claim 1, wherein the load detection unit includes a system terminal, the system terminal is electrically connected to the second terminal of the second switch unit, the first detection voltage is determined according to a voltage of the system terminal, when the secondary over-absorption protection unit determines that the first detection voltage is greater than a first reference voltage, the logic control unit starts timing, and when a timing duration of the logic control unit is greater than or equal to a second preset duration, the logic control unit controls the second switch unit to keep off; wherein the first reference voltage is used to characterize the first current threshold.

3. The battery protection circuit according to claim 2, wherein the first detection voltage is a voltage of the system terminal, or the first detection voltage is a difference between a voltage of the power supply terminal and a voltage of the system terminal.

4. The battery protection circuit according to claim 1, wherein the first detection voltage is a voltage drop of the second switching unit, when the secondary over-voltage protection unit determines that the first detection voltage is greater than a first reference voltage, the logic control unit starts timing, and when a timing duration of the logic control unit is greater than or equal to a second preset duration, the logic control unit controls the second switching unit to keep off; wherein the first reference voltage is used to characterize the first current threshold.

5. The battery protection circuit according to claim 1, wherein the load detection unit comprises a current detection terminal, the current detection terminal is configured to be electrically connected to at least one terminal of a first detection resistor, the second switch unit is configured to be connected in series with the battery and the first detection resistor to form part of the main discharge loop, the first detection voltage is determined according to a voltage of the current detection terminal, when the secondary overvoltage protection unit determines that the first detection voltage is greater than a first reference voltage, the logic control unit starts timing, and when a timing duration of the logic control unit is greater than or equal to a second preset duration, the logic control unit controls the second switch unit to be kept off; wherein the first reference voltage is used to characterize the first current threshold.

6. The battery protection circuit of claim 5, wherein the second ground terminal is configured to be electrically connected to a first terminal of the first detection resistor, the current detection terminal is configured to be electrically connected to a second terminal of the first detection resistor, and the first detection voltage is a voltage of the current detection terminal; alternatively, the first and second electrodes may be,

7. The battery protection circuit of claim 5, wherein the first detection voltage is a voltage drop across the first detection resistor.

8. The battery protection circuit according to any one of claims 1-7, wherein the secondary over-absorption protection unit comprises an over-absorption comparison unit, one input end of the over-absorption comparison unit is connected to a first detection voltage, the other input end of the over-absorption comparison unit is connected to a preset first reference voltage, and the output end of the over-absorption comparison unit is electrically connected to the logic control unit; wherein the first reference voltage is used to characterize the first current threshold.

9. The battery protection circuit according to any one of claims 1 to 7, wherein the logic control unit comprises a battery logic unit and an over-suction logic unit, wherein the battery logic unit is electrically connected to the over-discharge voltage protection unit, the discharge over-current protection unit and a control end of the second switch unit, the over-suction logic unit is electrically connected to the secondary over-suction protection unit, and the over-suction logic unit is electrically connected to the battery logic unit or the over-discharge voltage protection unit.

10. The battery protection circuit of claim 9, wherein when the overdriving logic unit timing is greater than or equal to a second preset duration, the overdriving logic unit outputs a sleep signal to the battery logic unit or outputs an over-discharge signal to the over-discharge voltage protection unit, and the battery logic unit controls the battery protection circuit to enter a sleep mode in which the second switch unit is kept off.

11. The battery protection circuit of claim 10, wherein at least some of the cells of the battery protection module stop consuming power in the sleep mode or all of the cells of the battery protection module stop consuming power in the sleep mode.

12. The battery protection circuit according to any one of claims 1 to 7, wherein the logic control unit comprises a battery logic unit and an overdriving logic unit, wherein the battery logic unit is electrically connected to the over-discharge voltage protection unit and the discharge over-current protection unit, respectively, the overdriving logic unit is electrically connected to the secondary overdriving protection unit, and the overdriving logic unit and the battery logic unit are both electrically connected to the control terminal of the second switch unit to control whether the second switch unit is turned off.

13. The battery protection circuit according to claim 12, wherein the logic control unit further comprises a logic gate circuit, one input end of the logic gate circuit is electrically connected to the battery logic unit, the other input end of the logic gate circuit is electrically connected to the overdraw logic unit, and an output end of the logic gate circuit is electrically connected to the control end of the second switch unit, and when the logic gate circuit receives any one of the signals for turning off the second switch unit, the logic gate circuit controls the second switch unit to be turned off, and when the battery logic unit and the overdraw logic unit both output the signal for turning on the second switch unit, the logic gate circuit controls the second switch unit to be turned on.

14. The battery protection circuit according to any one of claims 1-7, wherein the logic control unit comprises an overdriving logic unit, the overdriving logic unit comprises a second timing unit and a second duration control unit, an input end of the second timing unit is electrically connected to the secondary overdriving protection unit, an output end of the second timing unit is electrically connected to the second duration control unit, the second duration control unit is electrically connected to a control end of the second switch unit, the second timing unit starts timing when the secondary overdriving protection unit determines that the current in the main discharging loop is greater than the first current threshold according to the first detection voltage, the second timing unit stops timing when the secondary overdriving protection unit determines that the current in the main discharging loop is less than the first current threshold according to the first detection voltage, when the second time length control unit judges that the timing time length of the second timing unit is greater than or equal to a second preset time length, the second time length control unit outputs a secondary over-suction protection signal to control the second switch unit to be kept disconnected; alternatively, the first and second electrodes may be,

15. The battery protection circuit of claim 14, wherein the second timing unit comprises a first reference frequency generation unit and a second timing subunit; the second timing subunit is electrically connected with the secondary over-suction protection unit, the second duration control unit and the first reference frequency generation unit respectively, starts timing when the secondary over-suction protection unit judges that the current in the main discharge loop is greater than a first current threshold value according to the first detection voltage, and stops timing when the secondary over-suction protection unit judges that the current in the main discharge loop is smaller than the first current threshold value according to the first detection voltage; alternatively, the first and second electrodes may be,

16. The battery protection circuit according to any one of claims 1-7, wherein the logic control unit comprises an overdriving logic unit, the overdriving logic unit comprises a second timing unit, a second duration control unit, a third timing unit and a third duration control unit, an input end of the second timing unit and an input end of the third timing unit are respectively electrically connected to the secondary overdriving protection unit, the second timing unit is electrically connected to the second duration control unit, the third timing unit is electrically connected to the third duration control unit, the third duration control unit is electrically connected to the second timing unit, the second duration control unit is electrically connected to a control terminal of the second switch unit, and the second timing unit starts to time when the secondary overdriving protection unit determines that the current in the main discharging loop is greater than the first current threshold according to the first detection voltage, when the secondary over-suction protection unit judges that the current in the main discharge loop is smaller than a first current threshold value according to the first detection voltage, the third timing unit starts timing, when the secondary over-suction protection unit judges that the current in the main discharge loop is larger than a first current threshold value according to the first detection voltage, the third timing unit stops timing, when the third time length control unit judges that the timing time length of the third timing unit is greater than or equal to a third preset time length, a reset signal is output to the second timing unit so that the second timing unit stops timing and the timing time length is set to zero, when the second time length control unit judges that the timing time length of the second timing unit is greater than or equal to a second preset time length, the second time length control unit outputs a secondary over-suction protection signal to control the second switch unit to be disconnected; alternatively, the first and second electrodes may be,

17. The battery protection circuit of claim 16, wherein the second timing unit comprises a first reference frequency generation unit and a second timing subunit, and the third timing unit comprises a third timing subunit; the second timing subunit is respectively electrically connected with the secondary over-suction protection unit, the second duration control unit and the first reference frequency generation unit, the third timing subunit is respectively electrically connected with the secondary over-suction protection unit, the third duration control unit and the first reference frequency generation unit, the third duration control unit is electrically connected with the second timing subunit, the second timing subunit starts timing when the secondary over-suction protection unit judges that the current in the main discharge loop is greater than the first current threshold according to the first detection voltage, the third timing subunit starts timing when the secondary over-suction protection unit judges that the current in the main discharge loop is less than the first current threshold according to the first detection voltage, and the third timing subunit stops timing when the secondary over-suction protection unit judges that the current in the main discharge loop is greater than the first current threshold according to the first detection voltage, when the third time length control unit judges that the timing time length of the third timing subunit is greater than or equal to a third preset time length, a reset signal is output to the second timing subunit so that the second timing unit stops timing and the timing time length is set to zero; alternatively, the first and second electrodes may be,

18. The battery protection circuit according to any one of claims 1 to 7, wherein the battery protection module and the second switch unit are located on the same chip, the power supply terminal is a power supply pin, the second ground terminal is a second ground pin, the battery protection module further includes a system pin, the system pin is electrically connected to the second terminal of the second switch unit, and the second terminal of the second switch unit is used for being electrically connected to the atomizing assembly via the system pin; alternatively, the first and second electrodes may be,

the battery protection module is located on the first chip, the first switch unit is located outside the first chip, the power supply end is a power supply pin, the second grounding end is a second grounding pin, the battery protection module further comprises a second switch control pin, and the second switch control pin is electrically connected with the control end of the second switch unit.

19. The battery protection circuit according to any one of claims 1-7, wherein the second switching unit comprises an NMOS transistor or a PMOS transistor; alternatively, the first and second electrodes may be,

20. The battery protection circuit according to any one of claims 1 to 7, wherein the battery protection module further comprises a charging detection unit and a system terminal, the charging detection unit is electrically connected to the logic control unit and the system terminal, respectively, the system terminal is electrically connected to the second terminal of the second switch unit, and the second switch unit is turned on when the charging detection unit detects a charging signal.

21. The battery protection circuit of any of claims 1-7, wherein the second predetermined duration is adjustable.

22. The battery protection circuit according to claim 21, wherein the logic control unit comprises an over-absorption logic unit, the over-absorption logic unit comprises a first reference frequency generation unit or a second reference frequency generation unit, wherein the first reference frequency generation unit or the second reference frequency generation unit comprises a frequency comparator, a frequency switch unit, a first current source and a frequency capacitor, a first end of the first current source is electrically connected to the power supply terminal, a second end of the first current source is electrically connected to the first end of the frequency switch unit, an input end of the frequency comparator and the frequency capacitor, respectively, another input end of the frequency comparator is connected to a preset first frequency reference voltage, an output end of the frequency comparator is electrically connected to the control terminal of the frequency switch unit, and a second end of the frequency switch unit is electrically connected to the second ground terminal, the frequency capacitor end is used for being electrically connected with the frequency capacitor, and the second preset time is used for being in a proportional relation with the capacitance value of the frequency capacitor; alternatively, the first and second electrodes may be,

the logic control unit comprises an over-suction logic unit, and the over-suction logic unit comprises a first reference frequency generation unit or a second reference frequency generation unit; the first reference frequency generation unit or the second reference frequency generation unit comprises a frequency comparator, a frequency operational amplifier, a frequency switch unit, a first current source, a second current source, a frequency capacitor and a frequency resistance end, wherein the first current source comprises a first frequency MOS (metal oxide semiconductor) tube, and the second current source comprises a second frequency MOS tube; the source electrode of the first frequency MOS tube and the source electrode of the second frequency MOS tube are electrically connected with a power supply end, the grid electrode of the first frequency MOS tube and the grid electrode of the second frequency MOS tube are electrically connected and are commonly connected with the output end of the frequency operational amplifier, one input end of the frequency operational amplifier is connected with a preset second frequency reference voltage, the other input end of the frequency operational amplifier is electrically connected with the drain electrode of the second frequency MOS tube, the drain electrode of the second frequency MOS tube is also electrically connected with a frequency resistance end, the drain electrode of the first frequency MOS tube is respectively electrically connected with the first end of the frequency switch unit, one input end of the frequency comparator and the first end of the frequency capacitor, the other input end of the frequency comparator is connected with a preset first frequency reference voltage, the output end of the frequency comparator is electrically connected with the control end of the frequency switch unit, the second end of the frequency switch unit, The second end of the frequency capacitor is electrically connected with the second grounding end, the frequency resistor end is used for electrically connecting the frequency resistor, and the second preset time length is used for being in a proportional relation with the resistance value of the frequency resistor.

23. A battery pack for an electronic cigarette, comprising:

a battery;

the battery protection circuit of any one of claims 1-22, wherein the power supply terminal and the second ground terminal of the battery protection circuit are electrically connected to two terminals of the battery.

24. The battery assembly of claim 23, further comprising a first sense resistor, the battery, the second switch unit and the first detection resistor are connected in series to form part of the main discharge loop, a first end of the second switch unit is electrically connected with a second end of the first detection resistor, a first end of the first detection resistor is electrically connected with a negative electrode of the battery, the current detection unit comprises a current detection end which is electrically connected with the second end of the first detection resistor, the first detection voltage is the voltage of the current detection end, when the secondary over-suction protection unit judges that the first detection voltage is greater than a first reference voltage, the logic control unit starts timing, when the timing duration of the logic control unit is greater than or equal to a second preset duration, the logic control unit controls the second switch unit to be kept disconnected; wherein the first reference voltage is used to characterize the first current threshold; alternatively, the first and second liquid crystal display panels may be,

25. An electronic cigarette is characterized by comprising an atomization assembly, wherein the atomization assembly comprises a system control circuit and a heating element, the system control circuit comprises a first switch unit and a system control module, the control end of the first switch unit is electrically connected with the system control module, and the first switch unit is connected with the heating element in series to form a heating branch;

further comprising a battery protection circuit according to any one of claims 1 to 22 or a battery assembly according to claim 23 or 24, the second end of the second switch unit being electrically connected to the atomizing assembly.

26. The electronic cigarette of claim 25, wherein the battery, the second switch unit, the heating branch circuit, and the system control module are connected to form the main discharge loop, the heating branch circuit and the system control module are connected in parallel to form a parallel circuit, and the battery, the second switch unit, and the parallel circuit are connected in series.

27. The electronic cigarette of claim 25, wherein the system control module comprises an airflow detecting end and a system control unit, the airflow detecting end is electrically connected to the airflow detecting element, the airflow detecting end is electrically connected to the system control unit, the system control unit comprises a first timing unit, the first timing unit starts timing when the system control unit detects airflow flowing through the airflow detecting element, the system control unit drives a first switch unit to operate, the first timing unit stops timing and sets zero when the system control unit does not detect airflow flowing through the airflow detecting element, the system control unit stops driving the first switch unit to stop operating when the timing duration of the first timing unit is greater than or equal to a first preset duration, and the first preset time length is less than the second preset time length.

28. The electronic cigarette of claim 27, wherein the ratio of the second predetermined time period to the first predetermined time period is in a range of 1.1:1 to 2: 1; alternatively, the first and second electrodes may be,

29. The electronic cigarette according to any one of claims 25-28, wherein the system control module drives the first switch unit to operate in a PWM mode or a PFM mode, or drives the first switch unit to operate in a normally on conduction mode.