CN114878015A - Temperature detection circuit and electron cigarette - Google Patents
Temperature detection circuit and electron cigarette Download PDFInfo
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- CN114878015A CN114878015A CN202210368308.6A CN202210368308A CN114878015A CN 114878015 A CN114878015 A CN 114878015A CN 202210368308 A CN202210368308 A CN 202210368308A CN 114878015 A CN114878015 A CN 114878015A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
- A24F47/00—Smokers' requisites not otherwise provided for
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- 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
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
- G05D23/303—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature using a sensing element having a resistance varying with temperature, e.g. thermistor
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- Automation & Control Theory (AREA)
- Control Of Temperature (AREA)
Abstract
The invention is suitable for the technical field of temperature detection, and provides a temperature detection circuit and an electronic cigarette, wherein the temperature detection circuit comprises a power supply input end, a control circuit, a switch circuit, a first resistance circuit, a second resistance circuit and a subtracter circuit, the power supply input end is connected with a working power supply, the control circuit outputs a pulse modulation signal, the switch circuit switches the switch state according to the pulse modulation signal, and the first resistance circuit is connected with the working power supply to generate heat when the switch circuit is conducted. The subtractor circuit collects the voltage difference between the first resistance circuit and the second resistance circuit when the switch circuit is switched off. The control circuit determines a heating temperature of the first resistive circuit based on the voltage difference. To solve the problem that the increase of the accuracy of temperature sampling leads to the increase of cost.
Description
Technical Field
The invention belongs to the technical field, and particularly relates to a temperature detection circuit and an electronic cigarette.
Background
The electronic cigarette product is gradually accepted by the society as a substitute for tobacco, and with the increase of the number of electronic cigarette products sold, the development of related enterprises, on one hand, the requirements of the market on the functions and the use experience of the electronic cigarette are continuously improved, on the other hand, the supervision department is also actively issuing a regulation policy to protect the safety of consumers, and the greater problem faced by the electronic cigarette product at the present stage is the temperature monitoring problem of the electronic cigarette in the use process. Too low temperature can lead to the atomizing insufficient for the tobacco tar of incomplete atomizing is inhaled, and too high temperature then produces harmful substance equally easily, even brings the potential safety hazard, consequently, is very important to the temperature detection and the control of electron cigarette product heater.
Temperature detection at the present stage is generally performed by using a thermistor or a method of sampling the thermistor, the precision of the scheme of the thermistor is very easy to be affected by factors such as assembly precision, collision and shaking during use, the method of sampling the resistor is to perform comparison and confirmation of the temperature by a table look-up method and the like by sampling a real-time resistance value, if an accurate resistance value sampling result is desired, more sampling resources are needed, the chip cost is greatly increased, and therefore the method is rarely adopted at the present stage.
Disclosure of Invention
In view of this, an embodiment of the present invention provides a temperature detection circuit to solve the problem that the cost is increased due to the improvement of the accuracy of temperature sampling.
A first aspect of an embodiment of the present invention provides a temperature detection circuit, including:
the power supply input end is connected with the power supply input end and is used for accessing a working power supply;
the control circuit is connected with the power supply input end and the control circuit and is used for outputting a pulse modulation signal;
the switching circuit is connected with the switching circuit and used for switching the switching state according to the pulse modulation signal;
the first resistance circuit is connected with the switching circuit and is used for switching on the working power supply to generate heat when the switching circuit is switched on;
a second resistance circuit having a resistance equal to the resistance of the first resistance circuit;
the subtractor circuit is connected with the first resistance circuit and the second resistance circuit and used for collecting the voltage difference between the first resistance circuit and the second resistance circuit when the switch circuit is disconnected;
the control circuit is further used for determining the heating temperature of the first resistance circuit according to the voltage difference.
Optionally, the control circuit has a power supply end, a switch control signal output end, a first control signal output end, a second control signal output end and a sampling end, the first end of the switch circuit is connected to the power supply input end and the power supply end of the control circuit respectively, the second end of the switch circuit is connected to the input end of the first resistor circuit and the first input end of the subtractor circuit respectively, and the controlled end of the switch circuit is connected to the switch control signal output end of the control circuit; the controlled end of the first resistance circuit is connected with the first control signal output end of the control circuit, and the output end of the first resistance circuit is grounded; the controlled end of the second resistance circuit is connected with the second control signal output end of the control circuit, and the output end of the second resistance circuit is grounded; and the second input end of the subtracter circuit is connected with the first output end of the second resistor circuit, and the output end of the subtracter circuit is connected with the sampling end of the control circuit.
Optionally, the first resistance circuit includes a heating resistor and a first current source, a first end of the heating resistor is connected to a first end of the first current source, the connection node is an input end of the first resistance circuit, and a second end of the heating resistor is an output end of the first resistance circuit; the second end of the first current source is the controlled end of the first resistance circuit.
Optionally, the heating resistor is an atomizing wire.
Optionally, the second resistance circuit includes an equivalent resistance and a second current source, a first end of the equivalent resistance is connected to a first end of the second current source, the connection node is a first output end of the second resistance circuit, and a second end of the equivalent resistance is an output end of the second resistance circuit; the second end of the second current source is the controlled end of the second resistance circuit.
Optionally, the output current of the first current source and the output current of the second current source are equal.
Optionally, the pulse modulated signal comprises a pulse width modulated signal or a pulse frequency modulated signal.
Optionally, the switch circuit includes a first switch tube, a first end of the first switch tube is a first end of the switch circuit, a second end of the first switch tube is a second end of the switch circuit, and a controlled end of the first switch tube is a controlled end of the switch circuit.
Optionally, the subtractor circuit includes a subtractor, a first resistor, a second resistor, a third resistor, and a fourth resistor, wherein a first end of the first resistor is a first input end of the subtractor circuit, and a second end of the first resistor, a first end of the fourth resistor, and the first input end of the subtractor are interconnected; the first end of the second resistor is a second input end of the subtracter circuit, and the second end of the second resistor, the first end of the third resistor and the second input end of the subtracter are interconnected; a second end of the fourth resistor is interconnected with an output end of the subtracter, and the connection node is the output end of the subtracter circuit; and the second end of the third resistor is grounded.
A second aspect of the embodiments of the present invention provides an electronic cigarette, which includes a battery and the temperature detection circuit, where the battery is connected to a power input end of the temperature detection circuit.
The invention has at least the following beneficial effects:
the heating temperature of the first resistance circuit is determined according to the voltage difference by adding a second resistance circuit which is equal to the resistance of the first resistance circuit for heating, converting the resistance value change caused by the temperature into the voltage difference between the first resistance circuit and the second resistance circuit through a subtracter circuit for sampling. Because at room temperature, the voltage difference between the first resistance circuit and the second resistance circuit is almost equal to zero, and the resistance value of the first resistance circuit is smaller along with the temperature variation when generating heat, namely the resistance value variation caused by the temperature difference between the room temperature and the normal work is far smaller than the resistance value, therefore, the resistance value which is smaller along with the temperature variation is converted into the voltage difference which is larger along with the temperature variation by adding the second resistance circuit and the subtracter circuit, thereby converting the resistance sampling into the voltage sampling under the condition of not increasing more cost, and comparing the resistance sampling with the real time when sampling, so as to realize the voltage difference sampling, thereby when solving the problem that the cost is increased due to the improvement of the accuracy of the temperature sampling in the prior art, the accuracy and the real time of the sampling data can be further improved.
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 embodiments or the prior art descriptions 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 based on these drawings without inventive exercise.
Fig. 1 is a block diagram of a temperature detection circuit according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a temperature detection circuit according to an embodiment of the present invention.
Fig. 3 is a schematic circuit diagram of a temperature detection circuit according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this invention and the above-described drawings are intended to cover non-exclusive inclusions. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
In one embodiment, referring to fig. 1, the present invention provides a temperature detection circuit, which includes a power input terminal 10, a control circuit 60, a switch circuit 20, a first resistor circuit 30, a second resistor circuit 40, and a subtractor circuit 50. The control circuit 60 is connected to the power input terminal 10, the switch circuit 20 is connected to the power input terminal 10 and the control circuit 60, the first resistor circuit 30 is connected to the switch circuit 20, and the subtractor circuit 50 is connected to the first resistor circuit 30 and the second resistor circuit 40.
The power input terminal 10 is connected to a working power supply, the control circuit 60 outputs a pulse modulation signal, the switching circuit 20 realizes regular switching according to the pulse modulation signal, and the first resistance circuit 30 generates heat when the switching circuit 20 is turned on. The subtractor circuit 50 collects a voltage difference between the first resistance circuit 30 and the second resistance circuit 40 when the switch circuit 20 is turned off; the control circuit 60 determines the heating temperature of the first resistance circuit 30 based on the voltage difference. The resistance of the second resistance circuit 40 is equal to the resistance of the first resistance circuit 30.
In the above embodiment, by adding the second resistance circuit 40 having the same resistance as that of the first resistance circuit 30 for heating, the resistance value change due to temperature is converted into the voltage difference between the first resistance circuit 30 and the second resistance circuit 40 by the subtractor circuit 50 to be sampled, and the heating temperature of the first resistance circuit 30 is determined based on the voltage difference. Because the voltage difference between the first resistor circuit 30 and the second resistor circuit 40 is almost equal to zero at room temperature, and the resistance value of the first resistor circuit 30 is smaller along with the temperature variation when generating heat, that is, the resistance value variation caused by the temperature difference between the room temperature and the normal operation is much smaller than the resistance value, therefore, the resistance value which is smaller along with the temperature variation is converted into the voltage difference which is larger along with the temperature variation by adding the second resistor circuit 40 and the subtracter circuit 50, so that the resistance sampling can be converted into the voltage sampling without increasing more cost, and the real-time comparison is realized during the sampling, so as to realize the voltage difference sampling, thereby further improving the accuracy and the real-time performance of the sampling data when solving the problem that the cost is increased due to the improvement of the accuracy of the temperature sampling in the prior art.
The two states of the operation of the temperature detection circuit are illustrated below, and the switch circuit 20, the first resistance circuit 30, and the second resistance circuit 40 are all controlled by the control circuit 60;
in the first case, the switch circuit 20 is turned on, the power input terminal 10 supplies power to the first resistance circuit 30, and the first resistance circuit 30 is normally heated, so that the heating produces a normal liquid atomization effect. While the second resistor circuit 40 is not operated.
In the second situation, the switch circuit 20 is not turned on, the power input terminal 10 stops supplying power to the first resistor circuit 30, and the first resistor circuit 30 and the second resistor circuit 40 both operate normally under the control of the control circuit 60, since the first resistor circuit 30 is heated to generate a resistance change, therefore, in the case where the initial resistance values are the same, a difference occurs between the resistance value of the first resistance circuit 30 and the resistance value of the second resistance circuit 40, and at this time, the difference in resistance values can be converted into a voltage difference for sampling by the first resistor circuit 30 and the second resistor circuit 40 at the input of the subtractor circuit 50, thereby converting smaller resistance value change into more obvious voltage difference change, improving the precision of sampling temperature, realizing the function which can be realized only by a high-cost chip by virtue of smaller circuit improvement, therefore, the problem that cost is increased due to the fact that the accuracy of temperature sampling is improved in the prior art is solved.
It should be noted that any connection relationship for implementing signal transmission between the above functional circuits may be used, and is not limited, in this embodiment, the following connection relationship is used to implement signal transmission between the above functional circuits, specifically, the control circuit 60 has a power supply end, a switch control signal output end, a first resistance circuit 30 control signal output end, a second resistance circuit 40 control signal output end, and a sampling end, a first end of the switch circuit 20 is connected to the power supply input end 10 and the power supply end of the control circuit 60, a second end of the switch circuit 20 is connected to the input end of the first resistance circuit 30 and the first input end of the subtractor circuit 50, respectively, and a controlled end of the switch circuit 20 is connected to the switch control signal output end of the control circuit 60; the controlled end of the first resistance circuit 30 is connected with the control signal output end of the first resistance circuit 30 of the control circuit 60, and the output end of the first resistance circuit 30 is grounded; the controlled end of the second resistance circuit 40 is connected with the control signal output end of the second resistance circuit 40 of the control circuit 60, and the output end of the second resistance circuit 40 is grounded; a second input terminal of the subtractor circuit 50 is connected to a first output terminal of the second resistor circuit 40, and an output terminal of the subtractor circuit 50 is connected to a sampling terminal of the control circuit 60.
Alternatively, the control circuit 60 may be implemented using a master control unit as shown in fig. 3.
Alternatively, as shown in fig. 2 and fig. 3, the first resistor circuit 30 includes a heating resistor Rload and a first current source SRC1, a first end of the heating resistor Rload is connected to a first end of a first current source SRC1, the connection node is an input end of the first resistor circuit 30, and a second end of the heating resistor Rload is an output end of the first resistor circuit 30; a second terminal of the first current source SRC1 is a controlled terminal of the first resistor circuit 30.
The first current source SRC1 provides a stable current source for the heating resistor Rload, and whether the first current source SRC1 operates is controlled by the control circuit 60 as a whole, so that the current source can be controlled to be connected to the first resistor circuit 30 to maintain its normal operation when the switch is turned off. During the regular switching of the switch circuit 20, at this time, the switch circuit 20 is turned off, and the first current source SRC1 is connected, so that the normal working state of the first resistor circuit 30 can be ensured, and the temperature does not change suddenly.
Based on the above embodiment, optionally, the heating resistor Rload is an atomizing wire. When the atomizing wire is immersed in liquid such as tobacco tar, the temperature of the heating wire can be ensured to be basically unchanged even if the liquid is not heated for a short time when the switch circuit 20 is switched off, and the control circuit 60 controls the first current source SRC1 to be switched on when the switch circuit 20 is switched off, so that the temperature can be further ensured to be stable. It should be noted that, in order to further improve the accuracy of the subsequent detection, the first current source SRC1 needs to maintain the normal operating temperature with reference to the heating wire at this time
Optionally, the second resistor circuit 40 includes an equivalent resistor Rbm and a second current source SRC2, a first end of the equivalent resistor Rbm is connected to a first end of the second current source SRC2, the connection node is a first output end of the second resistor circuit 40, and a second end of the equivalent resistor Rbm is an output end of the second resistor circuit 40; a second terminal of the second current source SRC2 is a controlled terminal of the second resistor circuit 40.
The second current source SRC2 provides a stable current source for the equivalent resistor Rbm, and whether the second current source SRC2 works or not is controlled by the control circuit 60, so that when the switch is turned off, the first current source SRC1 and the second current source SRC2 are controlled to provide working currents for the heating resistor Rload and the equivalent resistor Rbm, respectively. It should be noted that the equivalent resistor Rbm has the same resistance as the heating resistor Rload.
Alternatively, the current of the first current source SRC1 and the current of the second current source SRC2 are equal.
Optionally, the pulse modulated signal comprises a pulse width modulated signal and a pulse frequency modulated signal.
Optionally, the switch circuit 20 includes a first switch tube Q1, the first terminal of the first switch tube Q1 is the first terminal of the switch circuit 20, the second terminal of the first switch tube Q1 is the second terminal of the switch circuit 20, and the controlled terminal of the first switch tube Q1 is the controlled terminal of the switch circuit 20.
It should be noted that the first switch Q1 may be implemented by a power transistor.
Optionally, the subtractor circuit 50 includes a subtractor SUB, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4, a first end of the first resistor R1 is a first input end of the subtractor circuit 50, and a second end of the first resistor R1, a first end of the fourth resistor R4, and the first input end of the subtractor are interconnected; a first terminal of the second resistor R2 is a second input terminal of the subtractor circuit 50, and a second terminal of the second resistor R2, a first terminal of the third resistor R3 and a second input terminal of the subtractor are interconnected; a second terminal of the fourth resistor R4 is interconnected with the output terminal of the subtractor, and the connection node is the output terminal of the subtractor circuit 50; the second terminal of the third resistor R3 is connected to ground.
The working principle of the invention is explained below with reference to fig. 1, 2 and 3:
when the circuit is powered on and atomization work is not started, the circuit is not conducted, the battery supplies power to the main control unit, the main control unit controls the two current sources SRC1 and SRC2 to work, current flows through the atomizer and the reference resistor respectively, and voltage on the resistor is transmitted to the input end of the subtracter. As shown in fig. two, a classical subtractor circuit 50 is shown, where R1, R2, R3, R4 are set, the output Vout1 of the subtractor is V2-V1, the difference Vout1 is the difference between two resistances in a room temperature environment, and since the atomizer and the reference resistance have the same specification, the difference is extremely small, and this step can be omitted when the requirement for circuit accuracy is not high;
when the electronic cigarette circuit normally works, because the output needs to be controlled, the electronic cigarette product at the present stage usually adopts a PWM or PFM mode to control the output, that is, the output of the circuit is not in a long-pass state, when the first switching tube Q1 is turned on, the circuit normally works, the atomizing filament heats the tobacco tar to generate an atomizing effect, at this time, the current sources SRC1 and SRC2 do not work, the subtractor circuit 50 does not work, when the circuit turns off the first switching tube Q1 based on modulation, the current sources SRC1 and SRC2 and the subtractor circuit 50 start to work, because the PWM control in the circuit has a fast switching speed and the atomizing filament Rload soaks in the tobacco tar, when Q1 is turned off, the temperature on the atomizing filament Rload does not change obviously, that is equivalent to the temperature at the working time, at this time, the output Vout2 of the subtractor is the pressure difference when the heating resistance Rload at the working temperature and the equivalent resistance Rbm at the room temperature flow the same current, since the output current of the constant current source is known with certainty, the difference between the two is converted into the difference between the resistance values.
The resistance value of the heating wire is smaller along with the variation of the temperature, namely the resistance value variation caused by the temperature difference between the room temperature and the normal work is far smaller than the resistance value, so that the resistance value needing to be accurately measured can be converted into a difference value with smaller variation by adopting the design of the invention, and accurate sampling can be realized by using a smaller AD circuit.
The resistance value of the electronic cigarette heating wire can be accurately measured and converted into the temperature condition under the condition of using less analog-to-digital conversion resources, the circuit is simple in design structure, the influence of a heating wire comparison method on production consistency and falling/vibration during use is small, a large amount of chip resources can be saved compared with the existing sampling circuit, and meanwhile, the purpose of accurate sampling is achieved.
In order to more accurately detect the voltage difference, the resistance of the equivalent resistor Rbm is set to be equal to the resistance of the heating resistor Rload, and the current of the first current source SRC1 is set to be equal to the current of the second current source SRC 2.
In order to solve the above problem, the present invention further provides an electronic cigarette, which includes a battery and the temperature detection circuit, wherein the battery is connected to a power input terminal 10 of the temperature detection circuit.
It should be noted that, because the electronic cigarette of the present invention includes all embodiments of the temperature detection circuit, the electronic cigarette of the present invention has all the advantages of the temperature detection circuit, and details thereof are not repeated herein.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A temperature sensing circuit, comprising:
the power supply input end is used for connecting a working power supply;
the control circuit is connected with the power supply input end and used for outputting a pulse modulation signal;
the switch circuit is connected with the power supply input end and the control circuit and is used for switching the switch state according to the pulse modulation signal;
the first resistance circuit is connected with the switching circuit and used for switching on the working power supply to generate heat when the switching circuit is conducted;
a second resistance circuit having a resistance equal to the resistance of the first resistance circuit;
the subtractor circuit is connected with the first resistance circuit and the second resistance circuit and used for collecting the voltage difference between the first resistance circuit and the second resistance circuit when the switch circuit is disconnected;
the control circuit is further configured to determine a heating temperature of the first resistive circuit based on the voltage difference.
2. The temperature sensing circuit of claim 1, wherein the control circuit has a power supply terminal, a switch control signal output terminal, a first control signal output terminal, a second control signal output terminal, and a sampling terminal, a first terminal of the switch circuit is connected to the power supply input terminal and the power supply terminal of the control circuit, respectively, a second terminal of the switch circuit is connected to the input terminal of the first resistance circuit and the first input terminal of the subtractor circuit, respectively, and a controlled terminal of the switch circuit is connected to the switch control signal output terminal of the control circuit; the controlled end of the first resistance circuit is connected with the first control signal output end of the control circuit, and the output end of the first resistance circuit is grounded; the controlled end of the second resistance circuit is connected with the second control signal output end of the control circuit, and the output end of the second resistance circuit is grounded; and the second input end of the subtracter circuit is connected with the first output end of the second resistor circuit, and the output end of the subtracter circuit is connected with the sampling end of the control circuit.
3. The temperature sensing circuit of claim 1, wherein the first resistor circuit comprises a heating resistor and a first current source, a first terminal of the heating resistor is connected to a first terminal of the first current source, the connection node is an input terminal of the first resistor circuit, and a second terminal of the heating resistor is an output terminal of the first resistor circuit; the second end of the first current source is the controlled end of the first resistance circuit.
4. The temperature sensing circuit of claim 3, wherein the heating resistor is an atomized filament.
5. The temperature sensing circuit of claim 3, wherein the second resistor circuit comprises an equivalent resistor and a second current source, a first terminal of the equivalent resistor being connected to a first terminal of the second current source, the connection node being a first output terminal of the second resistor circuit, a second terminal of the equivalent resistor being an output terminal of the second resistor circuit; the second end of the second current source is the controlled end of the second resistance circuit.
6. The temperature sensing circuit of claim 5, wherein the output current of the first current source and the output current of the second current source are equal.
7. The temperature sensing circuit of claim 1, wherein the pulse modulated signal comprises a pulse width modulated signal or a pulse frequency modulated signal.
8. The temperature detection circuit of claim 1, wherein the switch circuit comprises a first switch tube, the first terminal of the first switch tube is the first terminal of the switch circuit, the second terminal of the first switch tube is the second terminal of the switch circuit, and the controlled terminal of the first switch tube is the controlled terminal of the switch circuit.
9. The temperature sensing circuit of claim 1, wherein the subtractor circuit comprises a subtractor, a first resistor, a second resistor, a third resistor, and a fourth resistor, a first terminal of the first resistor being a first input terminal of the subtractor circuit, a second terminal of the first resistor, a first terminal of the fourth resistor, and a first input terminal of the subtractor interconnected; the first end of the second resistor is a second input end of the subtracter circuit, and the second end of the second resistor, the first end of the third resistor and the second input end of the subtracter are interconnected; a second end of the fourth resistor is interconnected with an output end of the subtracter, and the connection node is the output end of the subtracter circuit; and the second end of the third resistor is grounded.
10. An electronic cigarette, characterized in that the electronic cigarette comprises a battery and the temperature detection circuit of claim 1, the battery being connected to a power input of the temperature detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210368308.6A CN114878015A (en) | 2022-04-08 | 2022-04-08 | Temperature detection circuit and electron cigarette |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210368308.6A CN114878015A (en) | 2022-04-08 | 2022-04-08 | Temperature detection circuit and electron cigarette |
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| Publication Number | Publication Date |
|---|---|
| CN114878015A true CN114878015A (en) | 2022-08-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210368308.6A Pending CN114878015A (en) | 2022-04-08 | 2022-04-08 | Temperature detection circuit and electron cigarette |
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| Country | Link |
|---|---|
| CN (1) | CN114878015A (en) |
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2022
- 2022-04-08 CN CN202210368308.6A patent/CN114878015A/en active Pending
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Effective date of registration: 20230425 Address after: Building 3, No.2528 Youyi Road, Guali Town, Xiaoshan District, Hangzhou City, Zhejiang Province, 311241 Applicant after: Hangzhou Shanger Semiconductor Co.,Ltd. Address before: B201, zero one square, Xi'an Software Park, 72 Keji 2nd Road, high tech Zone, Xi'an City, Shaanxi Province, 710000 Applicant before: Tuoer Microelectronics Co.,Ltd. |