CN107105785B - Switching circuit and method for changing equivalent resistance of atomizer heating wire and electronic cigarette - Google Patents

Switching circuit and method for changing equivalent resistance of atomizer heating wire and electronic cigarette Download PDF

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Publication number
CN107105785B
CN107105785B CN201580072946.1A CN201580072946A CN107105785B CN 107105785 B CN107105785 B CN 107105785B CN 201580072946 A CN201580072946 A CN 201580072946A CN 107105785 B CN107105785 B CN 107105785B
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China
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heating wire
atomizer
temperature
atomizer heating
equivalent resistance
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CN107105785A (en
Inventor
向智勇
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Jisheng Technology (Huizhou) Co.,Ltd.
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Kimree Technology Co Ltd
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    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/50—Control or monitoring
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/10—Devices using liquid inhalable precursors

Abstract

A switching circuit (100) and a method for changing equivalent resistance of an atomizer heating wire and an electronic cigarette solve the technical problem that the working temperature of the heating wire is too high because the temperature of the atomizing heating wire cannot be measured and controlled by the electronic cigarette in the prior art. The switching circuit (100) comprises: a temperature detection circuit (10) and a changeover switch circuit (20). A temperature detection circuit (10) detects and acquires a temperature value of the heater (30), and generates a control signal for controlling the changeover switch circuit (20) based on the temperature value. When the heating wire (30) is over-heated, the switching circuit (20) changes the equivalent resistance of the heating wire (30) so as to reduce the power supply current of the battery rod (1) to the heating wire (30), or the battery rod (1) intermittently supplies power to the heating wire (30) so as to cool the heating wire (30). When the temperature of the heating wire (30) returns to normal, the change-over switch circuit (20) returns to the equivalent resistance of the heating wire (30), so that the battery pole (1) supplies power for the heating wire (30) to heat normally. The temperature of the heating wire is monitored when the heating wire is heated, so that the temperature of the heating wire is within a preset temperature range and cannot be too high.

Description

Switching circuit and method for changing equivalent resistance of atomizer heating wire and electronic cigarette
Technical Field
The invention relates to the technical field of electronic cigarettes, in particular to a switching circuit and a switching method for changing equivalent resistance of an atomizer heating wire and an electronic cigarette.
Background
The electronic cigarette is a common simulated cigarette electronic product and is mainly used for quitting smoking and replacing cigarettes; the electronic cigarette mainly comprises a battery rod and an atomizer; when the smoking action of a smoker is detected, the battery rod supplies power to the atomizer, so that the atomizer is in an open state; after the atomizer was opened, the atomizer heater generated heat, and the tobacco tar is heated the evaporation atomizing, forms the aerial fog of simulation flue gas to let the user have a kind of sensation similar to inhaling true cigarette when inhaling the electron cigarette.
At present, most of electronic cigarette atomizers consist of heating wires, conducting wires, copper wires and other parts; when the heating wire generates heat, the temperature of the heating wire cannot be measured and controlled, when the temperature of the heating wire is continuously increased and overhigh in the using process, the heating wire can output peculiar smell to influence the smoking taste of a user, and when the temperature of tobacco tar is high to a certain degree, harmful substances can be generated to harm the health of a smoker; in addition, under the condition that the atomizer tobacco tar has been exhausted, the user continues to smoke, can lead to the heater to continue to generate heat and the appearance condition of the piece of cotton.
That is to say, there is the unable detection of electron cigarette and control atomizer heater temperature among the prior art, and leads to the heater to appear the too high technical problem of temperature in the course of the work.
Technical problem
Aiming at the technical problem that the temperature of a heating wire of an atomizer cannot be detected and controlled by an electronic cigarette in the prior art, so that the temperature of the heating wire is overhigh in the working process, the invention provides the switching circuit and the switching method for changing the equivalent resistance of the heating wire of the atomizer and the electronic cigarette, and the technical effect of monitoring and controlling the temperature of the heating wire when the heating wire of the atomizer is heated is realized, so that the temperature of the heating wire is not overhigh.
Solution to the problem
Technical solution
In a first aspect, an embodiment of the present invention provides a switching circuit for changing an equivalent resistance of an atomizer heater, which is applied to temperature control of an atomizer heater of an electronic cigarette, and the switching circuit includes: the temperature detection circuit is arranged in an atomizer of the electronic cigarette, and the change-over switch circuit is connected with the temperature detection circuit and the atomizer heating wire;
the temperature detection circuit is used for detecting and acquiring a temperature value of the atomizer heating wire and generating a control signal for controlling the change-over switch circuit based on the temperature value;
the switching circuit is used for receiving the control signal; when the atomizer heating wire is over-temperature, the change-over switch circuit changes the equivalent resistance of the atomizer heating wire so as to reduce the power supply current of a battery rod of the electronic cigarette to the atomizer heating wire, or the battery rod intermittently supplies power to the atomizer heating wire, so as to realize the cooling of the over-temperature atomizer heating wire;
when the atomizer heater temperature returns to normal, the change-over switch circuit recovers the equivalent resistance of the atomizer heater makes the battery pole do the atomizer heater is normally powered and heated, thereby control the heating temperature of the atomizer heater is in the preset temperature range.
Optionally, the temperature detection circuit detects the temperature through a thermistor or a thermocouple.
Optionally, the switch circuit includes:
the first switch piece is connected with the atomizer heating wire and the temperature detection circuit;
the temperature detection circuit controls the first switch piece to be in an off state or an on state through the control signal; the change-over switch circuit changes the equivalent resistance of the atomizer heating wire based on different working states of the first switch piece.
Optionally, the first switch part is connected in parallel with the atomizer heating wire; when the atomizer heater was overtemperature, temperature detection circuit passed through control signal control first switch spare is in the on-state, the atomizer heater is by the short circuit, the equivalent resistance of atomizer heater becomes zero, the electron cigarette starts short-circuit protection function, the battery pole gives atomizer heater supply current reduces to zero to the realization is to the cooling of overtemperature prote atomizer heater.
Optionally, the switch circuit includes:
the adjusting resistor is connected with the atomizer heating wire;
the second switch part is connected with the atomizer heating wire, the adjusting resistor and the temperature detection circuit;
the temperature detection circuit controls the second switch piece to be in an off state or an on state through the control signal; the change-over switch circuit controls and adjusts the connection mode of the adjusting resistor and the atomizer heating wire based on different working states of the second switch piece so as to change the equivalent resistance of the atomizer heating wire.
Optionally, the atomizer heating wire is respectively connected in parallel with the adjusting resistor and the second switching element, and the adjusting resistor and the second switching element are connected in series;
when the atomizer heater was overtemperature, temperature detection circuit passed through control signal control second switch spare is in the on-state, the equivalent resistance of atomizer heater becomes the atomizer heater with the total resistance after adjusting resistance connects in parallel when total resistance after connecting in parallel is less than preset resistance, the electron cigarette starts overcurrent protection function, in order to reduce the battery pole gives the supply current of atomizer heater, or makes the battery pole is intermittent to do the atomizer heater supplies power, in order to realize the cooling to the overtemperature atomizer heater.
Optionally, the atomizer heating wire is respectively connected in series with the adjusting resistor and the second switching element, and the adjusting resistor and the second switching element are connected in parallel;
when the atomizer heater was overtemperature, temperature detection circuit passed through control signal control second switch spare is in the off-state, the equivalent resistance of atomizer heater becomes the atomizer heater with total resistance after adjusting resistance establishes ties, in order to reduce the battery pole of electron cigarette gives the supply current of atomizer heater to the realization is to the cooling of overtemperature atomizer heater.
In a second aspect, an embodiment of the present invention further provides a method for changing an equivalent resistance of a heater of an atomizer, which is applied to the switching circuit for changing the equivalent resistance of the heater of the electronic cigarette atomizer in the first aspect; the method comprises the following steps:
s1, detecting and acquiring a temperature value of a heating wire of the electronic cigarette atomizer;
s2, when the atomizer heating wire is over-temperature, changing the equivalent resistance of the atomizer heating wire to reduce the power supply current of the battery rod of the electronic cigarette to the atomizer heating wire, or enabling the battery rod to intermittently supply power to the atomizer heating wire to realize the cooling of the over-temperature atomizer heating wire;
s3, when the temperature of the atomizer heating wire returns to normal, the equivalent resistance of the atomizer heating wire is restored, so that the battery rod is used for normally supplying power and heating the atomizer heating wire, and the heating temperature of the atomizer heating wire is controlled to be within a preset temperature range.
In a third aspect, an embodiment of the present invention further provides an electronic cigarette, where the electronic cigarette includes: a battery stem and an atomizer; the atomizer is internally provided with a temperature detection circuit and a change-over switch circuit connected with the temperature detection circuit and the atomizer heating wire;
the temperature detection circuit is used for detecting and acquiring a temperature value of the atomizer heating wire and generating a control signal for controlling the change-over switch circuit based on the temperature value;
the switching circuit is used for receiving the control signal; when the atomizer heating wire is over-temperature, the equivalent resistance of the atomizer heating wire is changed by the change-over switch circuit so as to reduce the power supply current of the battery rod to the atomizer heating wire, or the battery rod intermittently supplies power to the atomizer heating wire so as to realize the cooling of the over-temperature atomizer heating wire;
when the atomizer heater temperature returns to normal, the change-over switch circuit recovers the equivalent resistance of the atomizer heater makes the battery pole do the atomizer heater is normally powered and heated, thereby control the heating temperature of the atomizer heater is in the preset temperature range.
Optionally, the temperature detection circuit detects the temperature through a thermistor or a thermocouple.
Optionally, the temperature detection circuit detects the temperature through a thermistor, and the temperature detection circuit includes:
the thermistor and the divider resistor are connected in parallel with the atomizer heating wire, the thermistor and the divider resistor are connected in series, and the series superposed voltage of the thermistor and the divider resistor is constant;
the thermistor is used for detecting and acquiring the temperature value of the atomizer heating wire, the resistance value of the thermistor is in direct proportion or in inverse proportion to the temperature value of the atomizer heating wire, and the voltage at two ends of the thermistor is in direct proportion to the resistance value of the thermistor;
the voltage division of the thermistor is used for controlling the change-over switch circuit to change the equivalent resistance of the atomizer heating wire, so that the heating temperature of the atomizer heating wire is within a preset temperature range.
Optionally, the switch circuit includes:
the first switch piece is connected with the atomizer heating wire and the temperature detection circuit;
the temperature detection circuit controls the first switch piece to be in an off state or an on state through the control signal; the change-over switch circuit changes the equivalent resistance of the atomizer heating wire based on different working states of the first switch piece.
Optionally, the first switch part is connected in parallel with the atomizer heating wire; when the atomizer heater was overtemperature, temperature detection circuit passed through control signal control first switch spare is in the on-state, the atomizer heater is by the short circuit, the equivalent resistance of atomizer heater becomes zero, the electron cigarette starts short-circuit protection function, the battery pole gives atomizer heater supply current reduces to zero to the realization is to the cooling of overtemperature prote atomizer heater.
Optionally, the switch circuit includes:
the adjusting resistor is connected with the atomizer heating wire;
the second switch part is connected with the atomizer heating wire, the adjusting resistor and the temperature detection circuit;
the temperature detection circuit controls the second switch piece to be in an off state or an on state through the control signal; the change-over switch circuit controls and adjusts the connection mode of the adjusting resistor and the atomizer heating wire based on different working states of the second switch piece so as to change the equivalent resistance of the atomizer heating wire.
Optionally, the atomizer heating wire is respectively connected in parallel with the adjusting resistor and the second switching element, and the adjusting resistor and the second switching element are connected in series;
when the atomizer heater was overtemperature, temperature detection circuit passed through control signal control second switch spare is in the on-state, the equivalent resistance of atomizer heater becomes the atomizer heater with total resistance after adjusting resistance connects in parallel works as when total resistance after parallelly connected is less than and presets resistance, the electron cigarette starts overcurrent protection function, in order to reduce the battery pole gives the supply current of atomizer heater, or makes the battery pole is interrupted does the atomizer heater supplies power, in order to realize the cooling to the overtemperature atomizer heater.
Optionally, the atomizer heating wire is respectively connected in series with the adjusting resistor and the second switching element, and the adjusting resistor and the second switching element are connected in parallel;
when the atomizer heater is overtemperature, the temperature detection circuit controls the second switch part to be in a disconnected state through the control signal, the equivalent resistance of the atomizer heater becomes the atomizer heater and the total resistance after the adjusting resistance is connected in series, so that the supply current of the atomizer heater is supplied to the battery pole, and the overtemperature atomizer heater is cooled.
Advantageous effects of the invention
Advantageous effects
Because in the scheme of the invention, the switching circuit for changing the equivalent resistance of the heating wire of the electronic cigarette atomizer comprises: the temperature detection circuit is arranged in an atomizer of the electronic cigarette, and the change-over switch circuit is connected with the temperature detection circuit and the atomizer heating wire; the temperature detection circuit is used for detecting and acquiring a temperature value of the atomizer heating wire and generating a control signal for controlling the change-over switch circuit based on the temperature value; the switching circuit is used for receiving the control signal; when the atomizer heating wire is over-temperature, the change-over switch circuit changes the equivalent resistance of the atomizer heating wire so as to reduce the power supply current of a battery rod of the electronic cigarette to the atomizer heating wire, or the battery rod intermittently supplies power to the atomizer heating wire, so as to realize the cooling of the over-temperature atomizer heating wire; when the temperature of the atomizer heating wire returns to normal, the equivalent resistance of the atomizer heating wire is restored by the switching circuit, so that the battery rod supplies power for the atomizer heating wire to heat normally, and the heating temperature of the atomizer heating wire is controlled to be within a preset temperature range; the problem of among the prior art electron cigarette can't detect and control atomizer heater temperature effectively, and lead to the heater high-temperature technical problem to appear in the course of the work, the temperature to the heater when the atomizer heater heating has been realized monitoring control, so that its temperature keeps in suitable temperature range, the smog taste that the tobacco tar atomizing produced is good in this temperature range, and can not produce toxic material, and can not take place to burn cotton phenomenon when the tobacco tar exhausts, user experience degree has been improved.
Brief description of the drawings
Drawings
In order to more clearly illustrate the embodiments of the present invention 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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a block diagram of a switching circuit for changing an equivalent resistance of a heater of an atomizer according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first temperature detection circuit controlling a switch circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a temperature detection circuit for controlling the temperature of an atomizer heater according to an embodiment of the present invention when a first switch is connected in parallel with the atomizer heater;
fig. 4 is a schematic structural diagram of a second temperature detection circuit controlling a switch circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a temperature detection circuit for controlling the temperature of an atomizer heater according to an embodiment of the present invention when a second switch is connected in parallel with the atomizer heater;
fig. 6 is a schematic structural diagram of a third temperature detection circuit controlling a switch circuit according to an embodiment of the present invention;
fig. 7 is a schematic circuit diagram of a temperature detection circuit for performing temperature control on an atomizer heater when a second switch is connected in series with the atomizer heater according to an embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating a first mounting position relationship between a thermistor and an atomizer heater according to an embodiment of the present invention;
FIG. 9 is a diagram illustrating a second mounting position relationship between a thermistor and an atomizer heater according to an embodiment of the present invention;
FIG. 10 is a schematic diagram illustrating a mounting position relationship between a thermocouple component and an atomizer heater according to an embodiment of the present invention;
FIG. 11 is a flowchart of a method for changing an equivalent resistance of a heater of an atomizer according to an embodiment of the present invention;
fig. 12 is a block diagram of an electronic cigarette according to an embodiment of the present invention.
Examples of the invention
Modes for carrying out the invention
The embodiment of the invention provides the switching circuit for changing the equivalent resistance of the atomizer heating wire, solves the technical problem that the temperature of the heating wire is too high in the working process because the electronic cigarette cannot detect and control the temperature of the atomizer heating wire in the prior art, and achieves the technical effect that the temperature of the heating wire is monitored and controlled when the atomizer heating wire is heated so as to be within a proper temperature range and not to be too high.
In order to solve the technical problems, the embodiment of the invention has the following general idea:
the embodiment of the invention provides a switching circuit for changing equivalent resistance of an atomizer heating wire, which is applied to temperature control of the heating wire of an electronic cigarette atomizer, and comprises: the temperature detection circuit is arranged in an atomizer of the electronic cigarette, and the change-over switch circuit is connected with the temperature detection circuit and the atomizer heating wire; the temperature detection circuit is used for detecting and acquiring a temperature value of the atomizer heating wire and generating a control signal for controlling the change-over switch circuit based on the temperature value; the switching circuit is used for receiving the control signal; when the atomizer heating wire is over-temperature, the change-over switch circuit changes the equivalent resistance of the atomizer heating wire so as to reduce the power supply current of a battery rod of the electronic cigarette to the atomizer heating wire, or the battery rod intermittently supplies power to the atomizer heating wire, so as to realize the cooling of the over-temperature atomizer heating wire; when the atomizer heater temperature returns to normal, the change-over switch circuit recovers the equivalent resistance of the atomizer heater makes the battery pole do the atomizer heater is normally powered and heated, thereby control the heating temperature of the atomizer heater is in the preset temperature range.
It can be seen that, in the embodiment of the present invention, a temperature value of an atomizer heating wire is detected and obtained through a temperature detection circuit, and a change-over switch circuit is controlled based on the temperature value to change an equivalent resistance of the heating wire, so as to reduce a supply current of a battery rod to the heating wire when the atomizer heating wire is over-temperature, or enable the battery rod to intermittently supply power to the atomizer heating wire, thereby achieving cooling of the over-temperature atomizer heating wire, and relatively, when the temperature of the atomizer heating wire is restored to normal, the change-over switch circuit restores the equivalent resistance of the atomizer heating wire, so as to enable the battery rod to normally supply power to the heating wire for heating, thereby controlling the heating temperature of the heating wire to be within a preset temperature range; the problem of among the prior art electron cigarette can't detect and control atomizer heater temperature effectively, and lead to the heater high-temperature technical problem to appear in the course of the work, the temperature to the heater when the atomizer heater heating has been realized monitoring control, so that its temperature keeps in suitable temperature range, the smog taste that the tobacco tar atomizing produced is good in this temperature range, and can not produce toxic material, and can not take place to burn cotton phenomenon when the tobacco tar exhausts, user experience degree has been improved.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present application, and are not limited to the technical solutions of the present application, and the technical features of the embodiments and examples of the present invention may be combined with each other without conflict.
Example one
Referring to fig. 1, an embodiment of the present invention provides a switching circuit 100 for changing an equivalent resistance of an atomizer heater, which is applied to temperature control of an electronic cigarette atomizer heater 30, and the switching circuit 100 includes: the electronic cigarette comprises a temperature detection circuit 10 arranged in an atomizer of the electronic cigarette, and a change-over switch circuit 20 connected with the temperature detection circuit 10 and an atomizer heating wire 30;
the temperature detection circuit 10 is used for detecting and acquiring a temperature value of the atomizer heating wire 30 and generating a control signal for controlling the change-over switch circuit 20 based on the temperature value; specifically, the temperature detection circuit 10 detects the temperature by a thermistor or a thermocouple;
a switch circuit 20 for receiving the control signal; when the atomizer heating wire 30 is over-temperature, the switch circuit 20 is switched to change the equivalent resistance of the atomizer heating wire 30 so as to reduce the power supply current of the battery rod of the electronic cigarette to the atomizer heating wire 30, or the battery rod intermittently supplies power to the atomizer heating wire 30, so as to realize the cooling of the over-temperature atomizer heating wire 30;
when the temperature of the atomizer heating wire 30 returns to normal, the equivalent resistance of the atomizer heating wire 30 is restored by the change-over switch circuit 20, so that the battery rod supplies power and heats the atomizer heating wire 30 normally, and the heating temperature of the atomizer heating wire 30 is controlled to be within a preset temperature range.
In a specific implementation, the switch circuit 20 includes: a switch member connected in series or in parallel with the atomizer heating wire 30; the temperature detection circuit 10 controls the switch element to be in a disconnected state or a connected state through the control signal, so that the equivalent resistance of the atomizer heating wire 30 is changed by the change-over switch circuit 20 based on different working states of the switch element, and the current flowing through the atomizer heating wire 30 is reduced when the temperature of the atomizer heating wire 30 is too high, so that the atomizer heating wire 30 is cooled. The following describes the present solution in detail based on different connection relationships between the switch member and the atomizer heating wire 30:
the first scheme is as follows: the switch is connected with the atomizer heating wire 30 in parallel
1) The equivalent resistance of the atomizer heater 30 is changed by short-circuiting the atomizer heater 30.
Referring to fig. 2, the switch circuit 20 includes: a first switching part 201 connected with the atomizer heating wire 30 and the temperature detection circuit 10; the temperature detection circuit 10 controls the first switch 201 to be in an off state or an on state through the control signal; the change-over switch circuit 20 changes the equivalent resistance of the atomizer heater 30 based on different operating states of the first switching element 201. Specifically, when the operating state of the first switching element 201 is the on state, the equivalent resistance of the atomizer heating wire 30 is reduced, and when the operating state of the first switching element 201 is the off state, the equivalent resistance of the atomizer heating wire 30 is restored (i.e., the initial resistance of the atomizer heating wire 30 is restored); wherein the reduction in the equivalent resistance of the atomizer heater 30 is relative to the initial resistance of the atomizer heater 30.
Still referring to fig. 2, the first switch 201 is connected in parallel with the atomizer heater 30; when atomizer heater 30 overtemperature, temperature detection circuitry 10 passes through control signal controls first switch spare 201 and is in the on-state, and atomizer heater 30 is by the short circuit, and atomizer heater 30's equivalent resistance becomes zero, the electron cigarette starts the short-circuit protection function, the battery pole reduces for atomizer heater 30 supply current for zero to the realization is to the cooling of overtemperature atomizer heater 30.
Referring to fig. 3, a schematic circuit diagram of the temperature detection circuit 10 performing temperature control on the atomizer heater when the first switch 201 is connected in parallel with the atomizer heater 30 is shown. In fig. 3, R1 is an atomizer heating wire 30, both ends of which are respectively connected with the positive and negative electrodes (B +, B-) of the battery; q1 is a first switching element 201 connected in parallel with R1; d1 is a stabilivolt, where 3.0V can be set; r6 is a protection resistor of D1, which can avoid the overlarge current of D1; r14 is PTC thermistor, and the resistance increases when the temperature rises; r7 is a resistor, and forms a voltage division circuit together with R14, and the divided voltage value Vc is used for controlling the on-off of Q1; and the C1 is a charging capacitor and is used for maintaining the stability of the voltage at two ends of the voltage dividing circuits of the voltage regulator tubes D1 and R7-R14 when the battery supplies power to a pulse modulation (PWM) signal. The Q1 is a field effect transistor, the grid of the Q1 is connected with the connecting line of the resistor R7 and the thermistor R14, and the Q1 is used for acquiring a voltage division signal Vc of the thermistor; one end of D1 is connected with battery cathode B-, the other end of D1 is connected with battery anode B + through R6, R7 is connected with R14 in series, and R7, R14 and C1 are all connected with D1 in parallel.
The temperature detection circuit 10 is composed of D1, R6, R7, R14 and C1, when the atomizer heater 30 (i.e., R1) is at a normal temperature, the divided voltage value Vc of R14 and R7 does not reach the conduction threshold of Q1, and the atomizer heater 30 works normally; when the temperature of the R1 rises to a set value, the resistance value of the R14 also increases, so that the value of Vc reaches the conduction threshold value of Q1, Q1 is conducted, so that the R1 is short-circuited, that is, the equivalent resistance of the atomizer heating wire 30 sharply decreases, which causes the current measured by the battery rod to increase greatly, the battery rod enters a short-circuit protection state, and the battery rod disconnects the power supply circuit of the atomizer heating wire 30, so that the temperature of the atomizer heating wire 30 is controlled. Wherein, when the tobacco juice in the atomizer is not exhausted, the set value is: atomizing the tobacco tar to generate the highest temperature value of smoke with better mouthfeel; when the smoke liquid in the atomizer is exhausted, the set value is slightly lower than the ignition temperature of the oil cotton in the electronic cigarette.
2) The equivalent resistance of the atomizer heater 30 is changed by connecting the atomizer heater 30 in parallel with the resistance.
Referring to fig. 4, the switch circuit 20 includes: an adjusting resistor 202 connected to the atomizer heater 30; a second switching element 203 connected to the atomizer heater 30, the adjusting resistor 202, and the temperature detection circuit 10; the temperature detection circuit 10 controls the second switch 203 to be in an off state or an on state through the control signal; the change-over switch circuit 20 controls and adjusts the connection mode between the adjusting resistor 202 and the atomizer heating wire 30 based on different working states of the second switch member 203, so as to change the equivalent resistance of the atomizer heating wire 30. Specifically, when the operating state of the second switching element 203 is the on state, the equivalent resistance of the atomizer heating wire 30 is reduced, and when the operating state of the second switching element 203 is the off state, the equivalent resistance of the atomizer heating wire 30 is restored (i.e., the initial resistance of the atomizer heating wire 30 is restored); wherein the reduction in the equivalent resistance of the atomizer heater 30 is relative to the initial resistance of the atomizer heater 30.
Still referring to fig. 4, the atomizer heater 30 is connected in parallel with the regulating resistor 202 and the second switching element 203, respectively, and the regulating resistor 202 is connected in series with the second switching element 203; when atomizer heater 30 overtemperature, temperature detection circuitry 10 passes through control signal control second switch 203 is in the on-state, and atomizer heater 30's equivalent resistance becomes the total resistance after atomizer heater 30 and adjusting resistor 202 are parallelly connected total resistance after parallelly connected is less than when predetermineeing resistance, the electron cigarette starts overcurrent protection function, in order to reduce the supply current of atomizer heater 30 is given to the battery pole, or makes the battery pole is interrupted for atomizer heater 30 power supply, in order to realize the cooling to overtemperature atomizer heater 30.
Referring to fig. 5, a schematic circuit diagram of the temperature detection circuit 10 performing temperature control on the atomizer heater when the second switch 203 is connected in parallel with the atomizer heater 30 is shown. In fig. 5, R4 is the atomizer heating wire 30, and its two ends are connected to the positive and negative electrodes (B +, B-) of the battery respectively; q3 is a second switch 203 connected in parallel with R4; d2 is a voltage regulator tube; r9 is a protection resistor of D2, which can avoid the overlarge current of D2; r16 is PTC thermistor, and the resistance increases when the temperature rises; r13 is a resistor, and forms a voltage division circuit together with R16, and the divided voltage value Vc is used for controlling the on-off of Q3; and the C3 is a charging capacitor and is used for maintaining the stability of the voltage at two ends of the voltage dividing circuits of the voltage regulator tubes D2 and R13-R16 when the battery supplies power to a pulse modulation (PWM) signal. One end of D2 is connected with battery cathode B-, the other end of D2 is connected with battery anode B + through R9, R13 is connected with R16 in series, and R13, R16 and C3 are all connected with D2 in parallel. It can be seen that the circuit configuration of fig. 5 is substantially the same as that of fig. 3, except that the branch in which Q3 is located is connected in series with resistor R12 (i.e., adjusting resistor 202).
The temperature detection circuit 10 is composed of D2, R9, R13, R16 and C3, when the atomizer heater 30 (i.e., R4) is at a normal temperature, the divided voltage value Vc of R16 and R13 does not reach the conduction threshold of Q3, and the atomizer heater 30 works normally; when the temperature of the R4 rises to a set value, the resistance value of the R16 is also increased, so that the value of Vc reaches the conduction threshold value of Q3, the Q3 is conducted, the R12 and the R4 are connected in parallel, when the resistance value of the R12 is small, the equivalent resistance of the atomizer heating wire 30 is greatly reduced, the current detected by the battery rod is greatly increased, the battery rod enters an overcurrent protection state, the battery rod disconnects the power supply circuit of the atomizer heating wire 30, and the temperature of the atomizer heating wire 30 is controlled. Wherein, when the tobacco juice in the atomizer is not exhausted, the set value is: atomizing the tobacco tar to generate the highest temperature value of smoke with better mouthfeel; when the smoke liquid in the atomizer is exhausted, the set value is slightly lower than the ignition temperature of the oil cotton in the electronic cigarette.
Scheme II: the switch member is connected in series with the atomizer heating wire 30
By connecting the atomizer heater 30 in series with a resistor, the equivalent resistance of the atomizer heater 30 is changed:
referring to fig. 6, the switch circuit 20 includes: an adjusting resistor 202 connected to the atomizer heater 30; a second switching element 203 connected to the atomizer heater 30, the adjusting resistor 202, and the temperature detection circuit 10; the temperature detection circuit 10 controls the second switch 203 to be in an off state or an on state through the control signal; the change-over switch circuit 20 controls and adjusts the connection mode between the adjusting resistor 202 and the atomizer heating wire 30 based on different working states of the second switch member 203, so as to change the equivalent resistance of the atomizer heating wire 30. Specifically, when the operating state of the second switching element 203 is the off state, the equivalent resistance of the atomizer heating wire 30 is increased, and when the operating state of the second switching element 203 is the on state, the equivalent resistance of the atomizer heating wire 30 is restored (i.e., the initial resistance of the atomizer heating wire 30 is restored); wherein the increase in the equivalent resistance of the atomizer heater 30 is relative to the initial resistance of the atomizer heater 30.
Still referring to fig. 6, the atomizer heater 30 is connected in series with the regulating resistor 202 and the second switching element 203, respectively, and the regulating resistor 202 is connected in parallel with the second switching element 203; when atomizer heater 30 overtemperature, temperature detection circuitry 10 passes through control signal control second switch 203 is in the off-state, and atomizer heater 30's equivalent resistance becomes the total resistance after atomizer heater 30 and adjusting resistance 202 establish ties, in order to reduce the supply current of atomizer heater 30 is given to the battery pole of electron cigarette to the realization is to overtemperature atomizer heater 30's cooling.
Referring to fig. 7, a schematic circuit diagram of the temperature detection circuit 10 performing temperature control on the atomizer heater when the second switch 203 is connected in series with the atomizer heater 30 is shown. In fig. 7, R2 is the atomizer heating wire 30, and its two ends are connected to the positive and negative electrodes (B +, B-) of the battery respectively; q2 is the second switching piece 203; d3 is a voltage regulator tube; r8 is a protection resistor of D3, which can avoid the overlarge current of D3; r15 is NTC type thermistor, and the resistance decreases when the temperature increases; r11 is a resistor, and forms a voltage division circuit together with R15, and the divided voltage value Vc is used for controlling the on-off of Q2; and the C2 is a charging capacitor and is used for maintaining the voltage across the voltage-dividing circuits of the voltage-stabilizing tube D3 and the voltage across the voltage-dividing circuits of the R11-R15 to be stable when the battery supplies power for pulse modulation (PWM) signals. One end of D3 is connected with battery cathode B-, the other end of D3 is connected with battery anode B + through R8, R11 is connected with R15 in series, and R11, R15 and C2 are all connected with D3 in parallel. It can be seen that the circuit configuration of fig. 7 is substantially the same as that of fig. 5 and 3, except that Q2 is connected in series with the atomizer heater 30 (i.e., R2), and the branch in which R2 is located is connected in series with the resistor R10 (i.e., the regulating resistor 202).
The temperature detection circuit 10 is composed of D3, R8, R11, R15 and C2, when the atomizer heater 30 (i.e., R2) is at a normal temperature value (i.e., the temperature of R2 is lower than a set value), the voltage division value Vc of R11 and R15 is higher than the conduction threshold value of Q2, Q2 is conducted, and the atomizer heater 30 works normally; when the temperature of R2 rises to a set value, Vc is lower than the on threshold of Q2, Q2 is cut off, so that R10 is connected into the current path of the atomizer and is connected with R2 in series; and because the battery pole is relatively stable for atomizer power supply voltage (namely the voltage between B + and B-), when the equivalent resistance of atomizer heater 30 increases, the current in the current path of atomizer heater 30 reduces, and atomizer heater 30 begins to cool down to be protected.
In the specific implementation process, the installation position relationship between the temperature detection component (i.e. thermistor or thermocouple) used by the temperature detection circuit 10 and the atomizer heating wire 30 is shown in fig. 8-10. In fig. 8, the temperature detecting component is a thermistor 81, and the atomizer heating wire 30 is wound around the thermistor 81; in fig. 9, the temperature detecting component is a thermistor 82, and the thermistor 82 is disposed at a position close to the periphery of the atomizer heating wire 30; in fig. 10, the temperature detection component is a thermocouple component 83, and one end of the atomizer heating wire 30 passes through the thermocouple component 83. Through the arrangement of the three atomizer heating wires 30 and the temperature detection components, the temperature detection of the atomizer heating wires 30 by the temperature detection circuit 10 can be realized.
In summary, in the embodiment of the present invention, a temperature detection circuit detects and obtains a temperature value of an atomizer heater, and a change-over switch circuit is controlled based on the temperature value to change an equivalent resistance of the heater, so as to reduce a supply current of a battery rod to the heater when the atomizer heater is over-heated, or to intermittently supply power to the atomizer heater by the battery rod, thereby cooling the over-heated atomizer heater, and correspondingly, when the temperature of the atomizer heater is recovered to be normal, the change-over switch circuit recovers the equivalent resistance of the atomizer heater, so that the battery rod normally supplies power to and heats the heater, thereby controlling the heating temperature of the heater to be within a preset temperature range; realized carrying out monitor control to the temperature of heater when the atomizer heater heating to make its temperature keep in suitable temperature range, the smog taste that the tobacco tar atomizing produced is good, and can not produce the toxic substance in this temperature range, and can not take place to burn cotton phenomenon when the tobacco tar exhausts, improved user and used the experience degree.
Example two
Based on the same inventive concept, please refer to fig. 11, an embodiment of the present invention further provides a method for changing an equivalent resistance of a heater of an atomizer, which is applied to a switching circuit for changing an equivalent resistance of a heater of an electronic cigarette atomizer according to the first embodiment, and the method includes the steps of:
s1, detecting and acquiring a temperature value of a heating wire of the electronic cigarette atomizer;
s2, when the atomizer heating wire is over-temperature, changing the equivalent resistance of the atomizer heating wire to reduce the power supply current of the battery rod of the electronic cigarette to the atomizer heating wire, or enabling the battery rod to intermittently supply power to the atomizer heating wire to realize the cooling of the over-temperature atomizer heating wire;
s3, when the temperature of the atomizer heating wire returns to normal, the equivalent resistance of the atomizer heating wire is restored, so that the battery rod is used for normally supplying power and heating the atomizer heating wire, and the heating temperature of the atomizer heating wire is controlled to be within a preset temperature range.
According to the above description, the method for changing the equivalent resistance of the atomizer heating wire is applied to the apparatus for changing the equivalent resistance of the atomizer heating wire, so the implementation process of the method and the implementation principle of one or more embodiments of the apparatus are explained, and are not repeated herein.
EXAMPLE III
Based on the same inventive concept, please refer to fig. 12, an embodiment of the present invention further provides an electronic cigarette, including: a battery rod 1 and an atomizer 2; the atomizer 2 is provided with a temperature detection circuit 10 and a change-over switch circuit 20 connected with the temperature detection circuit 10 and an atomizer heating wire 30;
the temperature detection circuit 10 is used for detecting and acquiring a temperature value of the atomizer heating wire 30 and generating a control signal for controlling the change-over switch circuit 20 based on the temperature value; specifically, the temperature detection circuit 10 detects the temperature by a thermistor or a thermocouple;
a switch circuit 20 for receiving the control signal; when the atomizer heating wire 30 is over-temperature, the change-over switch circuit 20 changes the equivalent resistance of the atomizer heating wire 30 to reduce the power supply current of the battery rod 1 to the atomizer heating wire 30, or the battery rod 1 intermittently supplies power to the atomizer heating wire 30 to realize the cooling of the over-temperature atomizer heating wire 30;
when the temperature of the atomizer heating wire 30 returns to normal, the change-over switch circuit 20 returns to the equivalent resistance of the atomizer heating wire 30, so that the battery rod 1 supplies power and heats the atomizer heating wire 30 normally, and the heating temperature of the atomizer heating wire 30 is controlled to be within the preset temperature range.
In a specific implementation process, the temperature detection circuit 10 detects the temperature through a thermistor, and the temperature detection circuit 10 includes: the atomizer heating wire 30 is connected with a thermistor 101 and a voltage dividing resistor 102 in parallel, the thermistor 101 and the voltage dividing resistor 102 are connected in series, and the series superposed voltage of the thermistor 101 and the voltage dividing resistor 102 is constant; the thermistor 101 is used for detecting and acquiring a temperature value of the atomizer heating wire 30, the resistance value of the thermistor 101 is in direct proportion or in inverse proportion to the temperature value of the atomizer heating wire 30, and the voltage at two ends of the thermistor 101 is in direct proportion to the resistance value thereof; specifically, referring to fig. 3, R1 is the atomizer heater 30, R14 is the thermistor 101, and R7 is the voltage dividing resistor 102, wherein R14 and R7 are connected in series; voltage-stabilizing tubes D1 are connected in parallel at two ends of a voltage-dividing branch consisting of R14 and R7, so that the voltage at two ends of the voltage-dividing branch is constant; fig. 5 and 7 also adopt such a circuit design principle. The thermistors used in fig. 3 and 5 are R14 and R16, respectively, and are PTC type thermistors, i.e., the resistance of the thermistor increases and the voltage across the thermistor increases when the temperature rises, and the NTC type thermistors used in fig. 7, i.e., the resistance of the thermistor decreases and the voltage across the thermistor decreases when the temperature rises; the voltage division of the thermistor 101 is used for controlling the change-over switch circuit 20 to change the equivalent resistance of the atomizer heating wire 30, so that the heating temperature of the atomizer heating wire 30 is within a preset temperature range.
In a specific implementation, the switch circuit 20 includes: a switch member connected in series or in parallel with the atomizer heating wire 30; the temperature detection circuit 10 controls the switch element to be in a disconnected state or a connected state through the control signal, so that the equivalent resistance of the atomizer heating wire 30 is changed by the change-over switch circuit 20 based on different working states of the switch element, and the current flowing through the atomizer heating wire 30 is reduced when the temperature of the atomizer heating wire 30 is too high, so that the atomizer heating wire 30 is cooled. The following describes the present solution in detail based on different connection relationships between the switch member and the atomizer heating wire 30:
the first scheme is as follows: the switch is connected with the atomizer heating wire 30 in parallel
1) The equivalent resistance of the atomizer heater 30 is changed by short-circuiting the atomizer heater 30.
Referring to fig. 2, the switch circuit 20 includes: a first switching part 201 connected with the atomizer heating wire 30 and the temperature detection circuit 10; the temperature detection circuit 10 controls the first switch 201 to be in an off state or an on state through the control signal; the change-over switch circuit 20 changes the equivalent resistance of the atomizer heater 30 based on different operating states of the first switching element 201.
Further, still referring to fig. 2, the first switch 201 is connected in parallel with the atomizer heater 30; when atomizer heater 30 overtemperature, temperature detection circuitry 10 passes through control signal controls first switch spare 201 and is in the on-state, and atomizer heater 30 is by the short circuit, and atomizer heater 30's equivalent resistance becomes zero, the electron cigarette starts the short-circuit protection function, and battery pole 1 reduces for atomizer heater 30 supply current to zero to the realization is to the cooling of overtemperature atomizer heater 30.
2) The equivalent resistance of the atomizer heater 30 is changed by connecting the atomizer heater 30 in parallel with the resistance.
Referring to fig. 4, the switch circuit 20 includes: an adjusting resistor 202 connected to the atomizer heater 30; a second switching element 203 connected to the atomizer heater 30, the adjusting resistor 202, and the temperature detection circuit 10; the temperature detection circuit 10 controls the second switch 203 to be in an off state or an on state through the control signal; the change-over switch circuit 20 controls and adjusts the connection mode between the adjusting resistor 202 and the atomizer heating wire 30 based on different working states of the second switch member 203, so as to change the equivalent resistance of the atomizer heating wire 30.
Further, still referring to fig. 4, the atomizer heating wire 30 is connected in parallel with the regulating resistor 202 and the second switching element 203 respectively, and the regulating resistor 202 is connected in series with the second switching element 203; when atomizer heater 30 overtemperature, temperature detection circuitry 10 passes through control signal control second switch 203 is in the on-state, and atomizer heater 30's equivalent resistance becomes the total resistance after atomizer heater 30 and adjusting resistor 202 are parallelly connected, works as when total resistance after parallelly connected is less than when predetermineeing resistance, the electron cigarette starts overcurrent protection function to reduce battery pole 1 and give atomizer heater 30's supply current, or make battery pole 1 intermittent for atomizer heater 30 power supply, in order to realize the cooling to overtemperature atomizer heater 30.
Scheme II: the switch member is connected in series with the atomizer heating wire 30
By connecting the atomizer heater 30 in series with a resistor, the equivalent resistance of the atomizer heater 30 is changed:
referring to fig. 6, the atomizer heating wire 30 is respectively connected in series with the regulating resistor 202 and the second switching element 203, and the regulating resistor 202 is connected in parallel with the second switching element 203; when atomizer heater 30 overtemperature, temperature detection circuitry 10 passes through control signal control second switch 203 is in the off-state, and the equivalent resistance of atomizer heater 30 becomes the total resistance after atomizer heater 30 and adjusting resistance 202 establish ties to reduce battery pole 1 and give atomizer heater 30's supply current, and realize the cooling to overtemperature atomizer heater 30.
According to the above description, the electronic cigarette includes the switching circuit for changing the equivalent resistance of the atomizer heating wire, so that the implementation of the electronic cigarette is the same as or similar to one or more embodiments of the switching circuit for changing the equivalent resistance of the atomizer heating wire, and thus, the details are not repeated here.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (4)

1. A method for changing equivalent resistance of a heating wire of an atomizer is applied to a switching circuit for changing equivalent resistance of the heating wire of the electronic cigarette atomizer, and is characterized by comprising the following steps:
s1, detecting and acquiring a temperature value of a heating wire of the electronic cigarette atomizer through a thermistor or a thermocouple;
s2, when the atomizer heating wire is over-temperature, changing the equivalent resistance of the atomizer heating wire to reduce the power supply current of the battery rod of the electronic cigarette to the atomizer heating wire, or enabling the battery rod to intermittently supply power to the atomizer heating wire to realize the cooling of the over-temperature atomizer heating wire;
when the equivalent resistance of the atomizer heating wire becomes zero, the electronic cigarette starts a short-circuit protection function, and the current supplied by the battery rod to the atomizer heating wire is reduced to zero;
when the equivalent resistance of the atomizer heating wire is smaller than a preset resistance, the electronic cigarette starts an overcurrent protection function to reduce the power supply current of the battery rod to the atomizer heating wire or enable the battery rod to intermittently supply power to the atomizer heating wire;
s3, when the temperature of the atomizer heating wire returns to normal, the equivalent resistance of the atomizer heating wire is restored, so that the battery rod is used for normally supplying power and heating the atomizer heating wire, and the heating temperature of the atomizer heating wire is controlled to be within a preset temperature range.
2. A switching circuit for changing equivalent resistance of an atomizer heating wire, applied to the method for changing equivalent resistance of an electronic cigarette atomizer heating wire according to claim 1, the switching circuit controlling temperature of the electronic cigarette atomizer heating wire, characterized in that the switching circuit comprises: the electronic cigarette comprises a temperature detection circuit (10) arranged in an atomizer of the electronic cigarette, and a change-over switch circuit (20) connected with the temperature detection circuit (10) and an atomizer heating wire;
the temperature detection circuit (10) is used for detecting and acquiring a temperature value of the atomizer heating wire and generating a control signal for controlling the change-over switch circuit (20) based on the temperature value;
the switch circuit (20) is used for receiving the control signal; when the atomizer heating wire is over-temperature, the change-over switch circuit (20) changes the equivalent resistance of the atomizer heating wire so as to reduce the power supply current of a battery rod of the electronic cigarette to the atomizer heating wire, or the battery rod intermittently supplies power to the atomizer heating wire so as to realize the cooling of the over-temperature atomizer heating wire;
when the temperature of the atomizer heating wire returns to normal, the change-over switch circuit (20) returns to the equivalent resistance of the atomizer heating wire, so that the battery rod supplies power for the atomizer heating wire to heat normally, and the heating temperature of the atomizer heating wire is controlled to be within a preset temperature range;
the temperature detection circuit (10) detects the temperature through a thermistor or a thermocouple;
the changeover switch circuit (20) includes: a first switch member (201) connected to the atomizer heating wire and the temperature detection circuit (10); the temperature detection circuit (10) controls the first switch part (201) to be in an off state or an on state through the control signal; the change-over switch circuit (20) changes the equivalent resistance of the atomizer heating wire based on different working states of the first switching piece (201); the first switching piece (201) is connected with the atomizer heating wire in parallel; when the atomizer heating wire is over-temperature, the temperature detection circuit (10) controls the first switch part (201) to be in a conducting state through the control signal, the atomizer heating wire is short-circuited, the equivalent resistance of the atomizer heating wire becomes zero, the electronic cigarette starts a short-circuit protection function, and the supply current of the battery rod to the atomizer heating wire is reduced to zero; or the like, or, alternatively,
the changeover switch circuit (20) includes: an adjusting resistor (202) connected with the atomizer heating wire; a second switching element (203) connected to the atomizer heater, the adjusting resistor (202) and the temperature detection circuit (10); the temperature detection circuit (10) controls the second switch (203) to be in an off state or an on state through the control signal; the change-over switch circuit (20) controls and adjusts the connection mode of the adjusting resistor (202) and the atomizer heating wire based on different working states of the second switch part (203) so as to change the equivalent resistance of the atomizer heating wire; the atomizer heating wire is respectively connected with the adjusting resistor (202) and the second switching piece (203) in parallel, and the adjusting resistor (202) and the second switching piece (203) are connected in series; when the atomizer heating wire is over-temperature, the temperature detection circuit (10) controls the second switch part (203) to be in a conducting state through the control signal, the equivalent resistance of the atomizer heating wire is changed into the total resistance after the atomizer heating wire and the adjusting resistor (202) are connected in parallel, and when the total resistance after the parallel connection is smaller than a preset resistance, the electronic cigarette starts an overcurrent protection function to reduce the power supply current of the battery rod to the atomizer heating wire or enable the battery rod to supply power to the atomizer heating wire intermittently; or the like, or, alternatively,
the changeover switch circuit (20) includes: an adjusting resistor (202) connected with the atomizer heating wire; a second switching element (203) connected to the atomizer heater, the adjusting resistor (202) and the temperature detection circuit (10); the temperature detection circuit (10) controls the second switch (203) to be in an off state or an on state through the control signal; the change-over switch circuit (20) controls and adjusts the connection mode of the adjusting resistor (202) and the atomizer heating wire based on different working states of the second switch part (203) so as to change the equivalent resistance of the atomizer heating wire; the atomizer heating wire is respectively connected with the adjusting resistor (202) and the second switching piece (203) in series, and the adjusting resistor (202) and the second switching piece (203) are connected in parallel; when the atomizer heater is overtemperature, temperature detection circuit (10) passes through control signal control second switch spare (203) are in the off-state, the equivalent resistance of atomizer heater becomes the atomizer heater with total resistance after adjusting resistance (202) establish ties, in order to reduce the battery pole of electron cigarette gives the supply current of atomizer heater to the realization is to the cooling of overtemperature atomizer heater.
3. An electronic cigarette, comprising: a battery stem and an atomizer; and a switching circuit as claimed in claim 2.
4. The electronic cigarette according to claim 3, characterized in that the temperature detection circuit (10) comprises:
the atomizer heating wire is connected with a thermistor (101) and a voltage dividing resistor (102) in parallel, the thermistor (101) and the voltage dividing resistor (102) are connected in series, and the series superposed voltage of the thermistor (101) and the voltage dividing resistor (102) is constant;
the thermistor (101) is used for detecting and acquiring a temperature value of the atomizer heating wire, the resistance value of the thermistor (101) is in direct proportion or in inverse proportion to the temperature value of the atomizer heating wire, and the voltage at two ends of the thermistor (101) is in direct proportion to the resistance value;
the voltage division of the thermistor (101) is used for controlling the change-over switch circuit (20) to change the equivalent resistance of the atomizer heating wire, so that the heating temperature of the atomizer heating wire is in a preset temperature range.
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