CN209860582U - Power protection circuit, electron cigarette, power protection device - Google Patents
Power protection circuit, electron cigarette, power protection device Download PDFInfo
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- CN209860582U CN209860582U CN201920379937.2U CN201920379937U CN209860582U CN 209860582 U CN209860582 U CN 209860582U CN 201920379937 U CN201920379937 U CN 201920379937U CN 209860582 U CN209860582 U CN 209860582U
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Abstract
The utility model discloses a power protection circuit, electron cigarette, power protection device belongs to power protection technical field. The power protection circuit includes: at least a set of N channel MOS pipe and direct current negative feedback resistance, every N channel MOS pipe of group includes first N channel MOS pipe and second N channel MOS pipe, wherein: the drain electrode of the first N-channel MOS tube is electrically connected with the cathode of the battery component, the source electrode of the first N-channel MOS tube is electrically connected with the source electrode of the second N-channel MOS tube, and the grid electrode of the first N-channel MOS tube is electrically connected with one control pin of the controller; the grid electrode of the second N-channel MOS tube is electrically connected with the grid electrode of the first N-channel MOS tube, the drain electrode of the second N-channel MOS tube is grounded through a direct current negative feedback resistor, and two ends of the direct current negative feedback resistor are respectively connected with a voltage detection pin of the controller; the controller is used for controlling each group of N-channel MOS tubes to be switched off when the battery assembly is detected to be abnormal; the effect of improving the use safety of the electronic equipment is achieved.
Description
Technical Field
The utility model relates to a power protection technical field, in particular to power protection circuit, electron cigarette, power protection device.
Background
The electronic cigarette is used as a substitute of a tobacco product, and is more and more popular in the market due to the characteristics of portability in use, large smoke amount and the like to a certain extent.
The electronic cigarette generally monitors whether an abnormal state, such as over-charging of a battery, over-discharging of the battery, over-current of the battery, low voltage of the battery, etc., occurs in a charging circuit or an output circuit of the electronic cigarette through a charging chip. If the charging chip breaks down in the charging process, the charging chip cannot provide safety guarantee for the circuit of the electronic cigarette, and potential safety hazards exist in the use of the electronic cigarette.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that there is the potential safety hazard in the use of electronic equipment among the correlation technique, the embodiment of the utility model provides a power protection circuit, electron cigarette, power protection device. The technical scheme is as follows:
in a first aspect, a power protection circuit is provided, which includes: at least a set of N channel MOS pipe and direct current negative feedback resistance, every group the N channel MOS pipe includes first N channel MOS pipe and second N channel MOS pipe, wherein:
in each group of the N-channel MOS tubes, the drain electrode of the first N-channel MOS tube is electrically connected with the cathode of the battery component, the source electrode of the first N-channel MOS tube is electrically connected with the source electrode of the second N-channel MOS tube, and the grid electrode of the first N-channel MOS tube is electrically connected with one control pin of the controller;
in each group of the N-channel MOS tubes, the grid electrode of the second N-channel MOS tube is electrically connected with the grid electrode of the first N-channel MOS tube, and the drain electrode of the second N-channel MOS tube is grounded through a direct current negative feedback resistor;
two ends of the direct current negative feedback resistor are respectively connected with a voltage detection pin of the controller;
the controller is used for controlling the first N-channel MOS tube and the second N-channel MOS tube to be switched off through the control pin when the battery pack is detected to be abnormal.
Optionally, the power protection circuit further includes a power protection switch, wherein:
the first path end of the power protection switch is connected with the charging circuit and/or the output circuit, the second path end of the power protection switch is connected with the anode of the battery pack, and the control end of the power protection switch is electrically connected with one control pin of the controller.
Optionally, the positive electrode and the negative electrode of the battery assembly are respectively connected with a voltage detection pin of the controller;
the controller is further used for determining whether the battery assembly is abnormal or not according to the voltage difference of the anode and the cathode of the battery assembly; and when the battery assembly is abnormal, controlling the first N-channel MOS tube and the second N-channel MOS tube to be switched off, or controlling the power protection switch to be switched off.
Optionally, the battery module includes a plurality of batteries connected in series in sequence, and two ends of each battery are respectively connected to a voltage detection pin of the controller;
the controller is further used for determining whether the batteries are reversely connected according to the voltage value of each battery; and when any battery is reversely connected, the first N-channel MOS tube and the second N-channel MOS tube are controlled to be switched off, or the power supply protection switch is controlled to be switched off.
Optionally, the power protection circuit further includes a charging protection circuit, wherein:
a power receiving end of a charging chip in the charging circuit is electrically connected with the charging interface;
the charging protection circuit is connected with a power supply receiving end of the charging chip and is connected with the charging chip in parallel;
the charging protection circuit is used for prohibiting surge pulse from being input into the charging chip in the charging process.
Optionally, the charging protection circuit includes: a transient suppression diode, wherein: one end of the transient suppression diode is connected with the charging interface and the power receiving end of the charging chip respectively, and the other end of the transient suppression diode is grounded.
Optionally, the charging interface is connected to the controller through a data protection circuit, and the data protection circuit is configured to ensure integrity of data transmitted to the controller through the charging interface.
In a second aspect, there is provided an electronic cigarette, including the power protection circuit according to the first aspect or any optional implementation manner of the first aspect, and an output circuit, an atomizer, a battery pack, and a controller, wherein:
the positive electrode of the battery assembly is connected with the atomizer through the output circuit;
the controller is used for controlling the output circuit to be conducted when receiving the cigarette lighting signal, so that the battery pack provides electric energy for the atomizer through the output circuit.
In a third aspect, there is provided a power protection device, the device including a memory, a controller, and the power protection circuit according to the first aspect or any optional implementation manner of the first aspect, wherein:
at least one program instruction is stored in the memory;
the controller is used for loading and executing the at least one program instruction so as to determine the current of the battery assembly according to the voltage difference between the two ends of the direct current negative feedback resistor; and when the overcurrent discharge or short circuit of the battery assembly is determined according to the current of the battery assembly, the first N-channel MOS tube and the second N-channel MOS tube are controlled to be turned off through the control pin.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is:
by providing a power protection circuit, the power protection circuit includes: first N channel MOS pipe, second N channel MOS pipe and direct current negative feedback resistance, wherein: the drain electrode of the first N-channel MOS tube is electrically connected with the cathode of the battery component, the source electrode of the first N-channel MOS tube is electrically connected with the source electrode of the second N-channel MOS tube, and the grid electrode of the first N-channel MOS tube is electrically connected with one control pin of the controller; the grid electrode of the second N-channel MOS tube is electrically connected with the grid electrode of the first N-channel MOS tube, the drain electrode of the second N-channel MOS tube is grounded through a direct current negative feedback resistor, and two ends of the direct current negative feedback resistor are respectively connected with a voltage detection pin of the controller; the controller is used for controlling the first N-channel MOS tube and the second N-channel MOS tube to be switched off through the control pin when the battery assembly is detected to be abnormal; the problem of potential safety hazard in charging of the electronic equipment when a charging chip in the electronic equipment breaks down in the related art is solved; the effect of improving the use safety of the electronic equipment is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic circuit diagram illustrating a power protection circuit according to an exemplary embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an electronic device according to an exemplary embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a charging protection circuit according to an exemplary embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. The "electronic device" referred to herein may include an electronic cigarette, a smart phone, a tablet computer, a smart television, an electronic book reader, an MP3 player (Moving Picture Experts Group Audio layer iii, mpeg Audio layer 3), an MP4 player (Moving Picture Experts Group Audio layer IV, mpeg Audio layer 4), a laptop portable computer, a desktop computer, and the like.
Fig. 1 is a schematic circuit connection diagram of a power protection circuit according to an exemplary embodiment of the present invention, and as shown in fig. 1, the power protection circuit includes: a first N-channel MOS transistor Q1, a second N-channel MOS transistor Q3 and a DC negative feedback resistor RSWherein:
the drain 13 of the first N-channel MOS transistor Q1 is electrically connected to the negative electrode of the battery assembly, the source 12 of the first N-channel MOS transistor is electrically connected to the source 32 of the second N-channel MOS transistor Q3, and the gate 11 of the first N-channel MOS transistor Q1 is electrically connected to one control pin 41 of the controller U1;
the grid 31 of the second N-channel MOS tube Q3 is electrically connected with the grid 11 of the first N-channel MOS tube Q1, and the drain 33 of the second N-channel MOS tube Q3 passes through the direct current negative feedback resistor RSGround, DC negative feedback resistor RSAre respectively connected with a voltage detection pin of the controller U1;
and the controller U1 is used for controlling the first N-channel MOS tube Q1 and the second N-channel MOS tube Q3 to be turned off through the control pin when the battery assembly is detected to be abnormal. The specific implementation can be as follows: a controller U1 for controlling the negative feedback resistance R according to DCSDetermining the current of the battery pack; and when the overcurrent discharge or short circuit of the battery assembly is determined according to the current of the battery assembly, the first N-channel MOS tube Q1 and the second N-channel MOS tube Q3 are controlled to be turned off through the control pins.
For example, as shown in FIG. 1, a DC degeneration resistor RSOne end of which is connected with a voltage detection pin 42 of the controller U1, and a direct current negative feedback resistor RSIs connected with the voltage detection pin 43 of the controller U1, the controller U1 determines the voltage difference between the voltage detected by the voltage detection pin 42 and the voltage detected by the voltage detection pin 43; calculating the voltage difference and DC negative feedback resistor RSThe ratio of the resistance values of the battery cells is obtained as the battery pack current.
Optionally, the negative electrode of the battery assembly and the direct current negative feedback resistor R are used in the embodimentSA group of N-channel MOS transistors (composed of a first N-channel MOS transistor Q1 and a second N-channel MOS transistor Q3) are disposed therebetween for illustration. In practical implementation, the negative electrode of the battery pack and the direct current negative feedback resistor RSA plurality of groups of N-channel MOS transistors are arranged between the power protection circuit and the power protection circuit, each group of N-channel MOS transistors is composed of a first N-channel MOS transistor Q1 and a second N-channel MOS transistor Q3, and the access mode of each group of N-channel MOS transistors in the power protection circuit can refer to the access mode of the group of N-channel MOS transistors in the power protection circuit, which is not described in detail herein. A plurality of groups of N-channel MOS tubes are arranged between the cathode of the battery component and the direct current negative feedback resistor RS and are connected in parallel to realize shunting, so that the N-channel MOS tubes in the power supply protection circuit are prevented from being damaged when the battery current is too high.
Optionally, the controller U1 is configured to control the first N-channel MOS transistor Q1 and the second N-channel MOS transistor Q3 to turn off when the battery pack current reaches the first threshold. For example, when the battery pack current determined by the controller U1 is higher than the first threshold value during the overcurrent discharge of the battery pack, the controller U1 outputs a low level through the control pin 41 to turn off the first N-channel MOS transistor Q1 and the second N-channel MOS transistor Q3, thereby disconnecting the battery circuit and preventing the battery pack from outputting electric energy to the outside. The first threshold is usually set by a developer, for example, the developer may determine the first threshold according to a minimum value of the battery current when the battery assembly is discharged by overcurrent.
Optionally, the controller U1 is configured to control the first N-channel MOS transistor Q1 and the second N-channel MOS transistor Q3 to turn off when the battery pack current reaches the second threshold. For example, when the current of the battery pack determined by the controller U1 is higher than the second threshold when the circuit is short-circuited, the controller U1 outputs a low level through the control pin 41 to turn off the first N-channel MOS transistor Q1 and the second N-channel MOS transistor Q3, thereby disconnecting the battery circuit and preventing the battery pack from outputting electric energy to the outside. The second threshold is usually set by a developer, for example, the developer may determine the second threshold according to the minimum value of the current of the battery pack when the short circuit occurs, and the first threshold is smaller than the second threshold.
Alternatively, the type of battery in the battery pack may be a lithium battery, an alkaline dry battery, a nickel-metal hydride battery, a lead-acid battery, an iron-nickel battery, a metal oxide battery, a zinc-silver battery, a zinc-nickel battery, a hydrogen-oxygen fuel cell, a solar cell, or the like, which can provide electric power, and may be a rechargeable or non-rechargeable battery.
To sum up, the embodiment of the present invention provides a power protection circuit, which controls the connection between the negative electrode of the battery assembly and the ground terminal to be disconnected when detecting the abnormality of the battery assembly, so as to protect the battery assembly and the related circuits; the problem of potential safety hazard in charging of the electronic equipment when a charging chip in the electronic equipment breaks down in the related art is solved; the effect of improving the use safety of the electronic equipment is achieved.
Optionally, the positive electrode and the negative electrode of the battery pack are respectively connected to a voltage detection pin of the controller U1. For example, as shown in fig. 1, the positive terminal of the battery pack is connected to the voltage detection pin 44 of the controller U1, and the negative terminal of the battery pack is connected to the voltage detection pin 45 of the controller U1.
The controller U1 is further used for determining whether the battery assembly is abnormal according to the voltage difference of the positive electrode and the negative electrode of the battery assembly; and when the battery pack is abnormal, controlling the first N-channel MOS tube Q1 and the second N-channel MOS tube Q3 to be turned off, or controlling the power protection switch Q2 to be turned off. The power protection switch Q2 may be an MOS transistor, and specifically, a P-channel MOS transistor may be used, and the type of the power protection switch Q2 is not specifically limited in this embodiment.
As shown in fig. 1, the first path terminal 23 of the power protection switch Q2 is connected to a charging circuit (not shown) and/or an output circuit (not shown), the second path terminal 22 of the power protection switch Q2 is connected to the positive electrode of the battery pack, and the control terminal 21 of the power protection switch Q2 is electrically connected to a control pin 46 of the controller U1. For example, when the power protection circuit is applied to an electronic cigarette, the first path terminal 23 of the power protection switch Q2 is connected to an atomizer in the electronic cigarette through an output circuit; the output circuit adjusts the battery voltage provided by the battery assembly to a predetermined voltage under the control of the controller U1, and then outputs the predetermined voltage to the atomizer, so that the atomizer performs atomization operation under the driving of the predetermined voltage. When the power protection switch Q2 employs a P-channel MOS transistor, the control terminal 21 is a gate of the P-channel MOS transistor, the first path terminal 23 is a drain of the P-channel MOS transistor, and the second path terminal 22 is a source of the P-channel MOS transistor.
Specifically, referring to fig. 1, the controller U1 may determine a voltage difference between the voltage detected by the voltage detection pin 44 and the voltage detected by the voltage detection pin 45 to obtain a battery voltage; and determining whether the battery assembly is abnormal according to the voltage of the battery. The abnormality of the battery pack includes at least one of overcharge, overdischarge, and low battery level.
Optionally, the controller U1 determines that the battery pack is overcharged when the battery voltage is higher than the third threshold, and controls the first N-channel MOS transistor Q1 and the second N-channel MOS transistor Q3 to turn off, so that the charging circuit stops charging the battery pack. The third threshold is usually set by a developer, for example, the developer may determine the third threshold according to the minimum voltage when the battery assembly is overcharged.
Optionally, when the battery voltage is lower than the fourth threshold, the controller U1 determines that the power of the battery assembly is too low, and controls the first N-channel MOS transistor Q1 and the second N-channel MOS transistor Q3 to turn off, so that the charging circuit cannot charge the battery assembly. Accidents such as explosion of the battery assembly caused by the fact that the battery assembly is damaged and cannot store electricity due to too low electric quantity of the battery assembly and electric energy is converted into heat energy through charging are avoided. Wherein the fourth threshold is typically set by a developer.
Optionally, the controller U1 determines that the battery pack is overdischarged when the battery voltage is lower than the fifth threshold, and controls the power protection switch Q2 to turn off, so that the battery pack stops outputting power outwards (e.g., the output circuit). The fifth threshold is larger than the fourth threshold, and the fifth threshold is usually set by a developer, for example, the developer may determine the fifth threshold according to the maximum value of the over-discharge of the battery assembly.
In one example, the battery assembly includes a plurality of batteries connected in series, and both ends of each battery are respectively connected with one voltage detection pin of the controller U1; the controller U1 is also used for determining whether the batteries are reversely connected according to the voltage value of each battery; and when any battery is reversely connected, the first N-channel MOS tube Q1 and the second N-channel MOS tube Q3 are controlled to be turned off, or the power protection switch Q2 is controlled to be turned off.
For example, as shown in fig. 1, the battery pack shown in fig. 1 includes two batteries connected in series, which are divided into a first battery BAT1 and a second battery BAT 2. The negative electrode of the first battery BAT1 is connected with the voltage detection pin 45 of the controller U1, the positive electrode of the first battery BAT1 is connected with the voltage detection pin 47 of the controller U1, and the positive electrode of the first battery BAT1 is connected with the negative electrode of the second battery BAT 2; the positive electrode of the second battery BAT2 is connected to the voltage detection pin 44 of the controller U1. The controller U1 determines the voltage difference between the voltage detected by the voltage detection pin 44 and the voltage detected by the voltage detection pin 47 to obtain the voltage of the second battery BAT 2; the controller U1 determines the voltage difference between the voltage detected by the voltage detection pin 47 and the voltage detected by the voltage detection pin 45 to obtain the voltage of the first battery BAT 1. If it is determined that the voltage of the second battery BAT2 is less than O, it indicates that the second battery BAT2 is reversely connected; if it is determined that the voltage of the first battery BAT1 is less than 0, it indicates that the first battery BAT1 is reversely connected.
Optionally, the utility model also provides an electronic equipment, this electronic equipment includes any one above embodiment power protection circuit. Optionally, referring to fig. 2, the electronic device may further include at least one of an output circuit, a charging protection circuit, a data protection circuit, a controller, a temperature detection device, a display device, and an input device. The charging interface may be a Universal Serial Bus (USB) interface.
The battery assembly is connected with a load through an output circuit, and the output circuit is also electrically connected with the controller; and, after the battery voltage is adjusted to a predetermined voltage under the control of the controller, the predetermined voltage is output to the load. In this embodiment, an electronic device is taken as an electronic cigarette, and a load of the electronic cigarette is taken as an atomizer for illustration, and when receiving a cigarette lighting signal, a controller controls an output circuit to be turned on, so that a battery assembly provides electric energy to the atomizer through the output circuit; the atomizer is driven by a preset voltage to perform atomization work, such as atomizing the cigarette liquid into smoke for an electronic cigarette user to suck.
Optionally, the temperature detection device is used for detecting the temperature of the battery assembly and is connected with the controller, so that the controller can obtain the temperature of the battery assembly; the controller is used for adopting cooling measures such as shutdown and the like to avoid the temperature of the battery pack from being too high when the temperature of the battery pack reaches a preset temperature threshold value. For example, the Temperature detecting device may be a Negative Temperature Coefficient (NTC) thermistor attached to the surface of the battery pack.
Optionally, the display device is connected to the controller, and the display device may be an LED display screen, a capacitive screen, a resistive screen, or the like, which is not specifically limited in this embodiment. The electronic device can display the electric quantity information of the electronic device, whether the battery assembly is abnormal or not and the like by using the display device.
Optionally, the input device is connected to the controller, and the input device may include a keyboard, a single key (e.g., a cigarette lighter key), and the like, and the input device is not particularly limited in this embodiment. When the electronic device is an electronic cigarette, the input device of the electronic device may further include a sensor component, and the sensor component is disposed in an air passage communicated with a mouth of the electronic cigarette; when a user draws through a mouthpiece of the electronic cigarette, the sensor assembly may detect changes in airflow within the airway, such as changes in air pressure, changes in airflow rate, etc., as the sensor assembly is disposed in the airway in communication with the mouthpiece; the electron cigarette is confirming the electron cigarette user according to sensor assembly's detection information and is smoking, then control battery pack to supply power in order to carry out atomizing work to the atomizer.
Optionally, the power protection circuit is connected to the charging interface through a charging circuit, the charging circuit adjusts the voltage and the current provided by the external power supply connected to the charging interface, and the adjusted voltage and current are provided to the battery pack to charge the battery pack.
Optionally, a charging protection circuit is further disposed between the charging circuit and the charging interface to protect the charging circuit during charging.
Optionally, when the charging interface is a USB interface, the controller is further connected to the charging interface through a data protection circuit; when the external device is connected with the charging interface, the external device and the controller can perform data transmission, and the data protection circuit is used for determining the integrity of the data transmitted by the USB.
In one example, the charging circuit 300 includes a charging chip U2, the charging circuit 300 including: charging chip U2 and charging interface J2, wherein: the power receiving end 320 of the charging chip U2 is electrically connected with the charging interface J2; the charging protection circuit 410 is connected with the power receiving terminal 320 of the charging chip U2, and is connected in parallel with the charging chip U2; the charge protection circuit 410 is used to inhibit the surge pulse from being input to the charging chip U2 during the charging process.
In practical implementation, the power receiving terminal 320 is electrically connected to the voltage bus terminal VBUS of the charging interface J2.
When the external power supply connected to the charging interface J2 generates a surge pulse due to voltage fluctuation, overvoltage, interference or static electricity, the charging protection circuit 410 can timely prevent the surge pulse from being input to the charging circuit 300, thereby not only preventing the circuit in the charging circuit 300 from being burned out, but also preventing other circuits in the electronic device from being damaged.
Optionally, referring to fig. 3, the charge protection circuit 410 may specifically include: a transient suppression diode D3, wherein: one end of the transient suppression diode D3 is connected to the charging interface J2 and the power receiving terminal 320 of the charging chip U2, respectively, and the other end of the transient suppression diode D3 is grounded.
In practical implementation, the cathode of the transient suppression diode D3 is connected to the voltage bus terminal VBUS of the charging interface J2 and the power receiving terminal 320 of the charging chip U2, and the anode of the transient suppression diode D3 is grounded.
In the charging process of the external power supply, if the instantaneous voltage exceeds the normal working voltage of the charging circuit 300, the two poles of the transient suppression diode D3 are subjected to reverse transient high-energy impact, the transient suppression diode D3 can generate avalanche, the high impedance between the two poles of the transient suppression diode D3 is changed into low impedance at the speed of 10 minus 12 th power second, and the surge power of thousands of watts is absorbed, so that the instantaneous current is led out through the transient suppression diode D3, and the instantaneous current is prevented from being input into the charging chip U2 in the charging circuit 300. Also, the voltage across the transient suppression diode D3 may be clamped at an off-voltage before the power supply voltage returns to a normal value, so that the voltage of the charging chip U2 in the charging circuit 300 can maintain the off-voltage at all times. When the transient surge pulse is over, the transient suppressor D3 automatically restores the high-impedance state, and the entire charging circuit 300 restores the normal voltage.
In practical applications, the specification of the transient suppression diode D3 may be selected according to the actual situation of the charging circuit 300 of the electronic device. Specifically, it should be ensured that the clamping voltage of the transient suppression diode D3 is not greater than the maximum allowable safe voltage of the charging circuit 300 when selecting; the maximum reverse operating voltage of the transient suppression diode D3 is not lower than the maximum operating voltage of the charging circuit 300; the rated maximum pulse power of the transient suppression diode D3 is greater than the maximum transient surge power present in the charging circuit 300. In practical implementation, the transient suppression diode D3 may be a transient suppression diode with an operating voltage of 6V.
Optionally, as shown in fig. 3, the charging chip U2 includes at least one of a charging current setting terminal 340, a lighting time setting terminal 350, and a soft start timing terminal 360, wherein:
optionally, a temperature control port (NTC) 330 of the charging chip U2 is connected to one end of the first resistor R2 and one end of the second resistor R3, the other end of the first resistor R2 may be connected to a voltage bus terminal VBUS of the charging interface J2, and the other end of the second resistor R3 is grounded.
Optionally, the charging chip U2 includes at least one of a charging Current setting terminal (ISET) 340, a bright time setting terminal (IBF) 350, and a Soft-Start timing terminal (Soft-Start Timer, SS)360, where:
the charging current setting end 340 of the charging chip U2 is grounded through the third resistor R5, and the magnitude of the charging current output by the power output end 310 of the charging circuit 300 can be adjusted by adjusting the resistance value of the third resistor R5;
the lighting time setting terminal 350 of the charging chip U2 is grounded through a fourth resistor R4; the soft start timing terminal 360 of the charging chip U2 is grounded through the filter capacitor C7.
Optionally, the ground terminal GND of the charging chip U2 is grounded, and the enable terminal of the charging chip U2 is groundedActive low, charge enable terminal of chip U2And (4) grounding.
Optionally, the charging state indication port (Open-Drain Charge Status Indicator,) The connection is connected with the system power supply end MCU _ VDD through a fifth resistor R7.
Alternatively, the charging chip U2 may be an MP2602 chip.
An embodiment of the utility model provides a power protection device still, the device includes: memory, controller and power protection circuit, wherein:
at least one program instruction is stored in the memory;
the controller is used for loading and executing the at least one program instruction so as to determine the current of the battery assembly according to the voltage difference between the two ends of the direct current negative feedback resistor; and when the overcurrent discharge or short circuit of the battery assembly is determined according to the current of the battery assembly, the first N-channel MOS tube and the second N-channel MOS tube are controlled to be turned off through the control pin.
Optionally, the controller is further configured to: acquiring voltage difference of a positive electrode and a negative electrode of the battery assembly to obtain a voltage value of the battery assembly; if the battery assembly is determined to be overcharged or the electric quantity is too low according to the voltage value, the first N-channel MOS tube and the second N-channel MOS tube are controlled to be turned off; and/or controlling the power protection switch to be turned off if it is determined that the battery assembly is over-discharged according to the voltage value.
Optionally, the controller is further configured to: when the electric quantity of the battery assembly is determined to be too low, the prompt message for prompting the battery assembly to be taken out of the electronic equipment is displayed, so that the user of the electronic equipment can take the battery assembly out of the electronic equipment according to the prompt message, and the electronic equipment is prevented from being damaged due to accidents such as explosion and the like caused in the charging process of the low-electric-quantity battery assembly.
The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying a number of the indicated technical features. Thus, a defined feature of "first", "second", may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (9)
1. A power protection circuit, comprising: at least one group of N-channel MOS tube and DC negative feedback resistor (R)S) Each set of the N-channel MOS transistors includes a first N-channel MOS transistor (Q1) and a second N-channel MOS transistor (Q3), wherein:
in each group of N-channel MOS tubes, the drain electrode (13) of the first N-channel MOS tube (Q1) is electrically connected with the negative electrode of the battery assembly, the source electrode (12) of the first N-channel MOS tube is electrically connected with the source electrode (32) of the second N-channel MOS tube (Q3), and the grid electrode (11) of the first N-channel MOS tube (Q1) is electrically connected with one control pin of a controller (U1);
in each group of N-channel MOS tubes, the grid electrode (31) of the second N-channel MOS tube (Q3) is electrically connected with the grid electrode (11) of the first N-channel MOS tube (Q1), and the second N-channel MOS tube(Q3) has its drain electrode (33) connected to a negative feedback resistor (R) via a DC resistorS) Grounding;
the DC degeneration resistor (R)S) Are respectively connected with a voltage detection pin of the controller (U1);
the controller (U1) is used for controlling the first N-channel MOS tube (Q1) and the second N-channel MOS tube (Q3) to be turned off through the control pin when the battery pack is detected to be abnormal.
2. The power protection circuit of claim 1, further comprising a power protection switch (Q2), wherein:
the first path end (23) of the power protection switch (Q2) is connected with a charging circuit (300) and/or an output circuit, the second path end (22) of the power protection switch (Q2) is connected with the anode of the battery pack, and the control end (21) of the power protection switch (Q2) is electrically connected with one control pin of the controller (U1).
3. The power protection circuit of claim 2, wherein the positive and negative poles of the battery pack are respectively connected to a voltage detection pin of the controller (U1);
the controller (U1) is further used for determining whether the battery pack is abnormal according to the voltage difference of the positive electrode and the negative electrode of the battery pack; and when the battery pack is abnormal, the first N-channel MOS tube (Q1) and the second N-channel MOS tube (Q3) are controlled to be turned off, or the power protection switch (Q2) is controlled to be turned off.
4. The power protection circuit according to claim 2, wherein the battery pack comprises a plurality of batteries connected in series in sequence, and two ends of each battery are respectively connected with a voltage detection pin of the controller (U1);
the controller (U1) is also used for determining whether the batteries are reversely connected according to the voltage value of each battery; and when any one of the batteries is reversely connected, the first N-channel MOS tube (Q1) and the second N-channel MOS tube (Q3) are controlled to be turned off, or the power protection switch (Q2) is controlled to be turned off.
5. The power protection circuit of claim 1, further comprising a charge protection circuit (410), wherein:
the power supply receiving end (320) of a charging chip (U2) in the charging circuit (300) is electrically connected with a charging interface (J2);
the charging protection circuit (410) is connected with a power supply receiving end (320) of the charging chip (U2) and is connected with the charging chip (U2) in parallel;
the charging protection circuit (410) is used for inhibiting the input of surge pulse to the charging chip (U2) during the charging process.
6. The power supply protection circuit according to claim 5, wherein the charge protection circuit (410) comprises: a transient suppression diode (D3), wherein: one end of the transient suppression diode (D3) is respectively connected with the charging interface (J2) and the power receiving end (320) of the charging chip (U2), and the other end of the transient suppression diode (D3) is grounded.
7. Power protection circuit according to claim 5, characterized in that said charging interface (J2) is connected to said controller (U1) by a data protection circuit for ensuring the integrity of the data transmitted to said controller (U1) through said charging interface (J2).
8. An electronic cigarette, comprising the power protection circuit of any one of claims 1 to 7, and an output circuit, an atomizer, a battery pack, and a controller, wherein:
the positive electrode of the battery assembly is connected with the atomizer through the output circuit;
the controller is further used for controlling the output circuit to be conducted when the cigarette lighting signal is received, so that the battery pack provides electric energy for the atomizer through the output circuit.
9. A power protection arrangement, characterized in that the arrangement comprises a memory, a controller (U1) and a power protection circuit according to any one of claims 1 to 7, wherein:
at least one program instruction is stored in the memory;
the controller (U1) is used for loading and executing the at least one program instruction so as to be according to the direct current negative feedback resistance (R)S) Determining the current of the battery pack; and controlling the first N-channel MOS tube (Q1) and the second N-channel MOS tube (Q3) to be turned off through the control pin when the battery assembly is determined to be in over-current discharge or short circuit according to the battery assembly current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920379937.2U CN209860582U (en) | 2019-03-22 | 2019-03-22 | Power protection circuit, electron cigarette, power protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920379937.2U CN209860582U (en) | 2019-03-22 | 2019-03-22 | Power protection circuit, electron cigarette, power protection device |
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| Publication Number | Publication Date |
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| CN209860582U true CN209860582U (en) | 2019-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920379937.2U Active CN209860582U (en) | 2019-03-22 | 2019-03-22 | Power protection circuit, electron cigarette, power protection device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6905134B1 (en) * | 2020-09-07 | 2021-07-21 | 日本たばこ産業株式会社 | Power supply unit of aerosol generator |
| US11399573B2 (en) | 2020-09-07 | 2022-08-02 | Japan Tobacco Inc. | Power supply unit for aerosol generation device |
| US11503862B2 (en) | 2020-09-07 | 2022-11-22 | Japan Tobacco Inc. | Power supply unit for aerosol generation device with switch unit on data line |
-
2019
- 2019-03-22 CN CN201920379937.2U patent/CN209860582U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6905134B1 (en) * | 2020-09-07 | 2021-07-21 | 日本たばこ産業株式会社 | Power supply unit of aerosol generator |
| JP2022044472A (en) * | 2020-09-07 | 2022-03-17 | 日本たばこ産業株式会社 | Power source unit of aerosol generating device |
| US11399573B2 (en) | 2020-09-07 | 2022-08-02 | Japan Tobacco Inc. | Power supply unit for aerosol generation device |
| US11503862B2 (en) | 2020-09-07 | 2022-11-22 | Japan Tobacco Inc. | Power supply unit for aerosol generation device with switch unit on data line |
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