CN203166461U - Control device used for overcurrent or short-circuit protection of electronic cigarette - Google Patents
Control device used for overcurrent or short-circuit protection of electronic cigarette Download PDFInfo
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- CN203166461U CN203166461U CN 201320099590 CN201320099590U CN203166461U CN 203166461 U CN203166461 U CN 203166461U CN 201320099590 CN201320099590 CN 201320099590 CN 201320099590 U CN201320099590 U CN 201320099590U CN 203166461 U CN203166461 U CN 203166461U
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- field effect
- effect transistor
- comparator
- control module
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- 239000003571 electronic cigarette Substances 0.000 title abstract description 4
- 230000005669 field effect Effects 0.000 claims abstract description 82
- 238000010438 heat treatment Methods 0.000 claims abstract description 49
- 239000004065 semiconductor Substances 0.000 claims description 18
- 235000019504 cigarettes Nutrition 0.000 claims description 16
- 230000000052 comparative effect Effects 0.000 claims description 16
- 241000208125 Nicotiana Species 0.000 claims description 6
- 235000002637 Nicotiana tabacum Nutrition 0.000 claims description 6
- 235000011389 fruit/vegetable juice Nutrition 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 230000000391 smoking effect Effects 0.000 description 16
- 238000010586 diagram Methods 0.000 description 11
- 230000002950 deficient Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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Abstract
The utility model discloses a control device used for overcurrent or short-circuit protection of an electronic cigarette. The device comprises an input module, a power module, a heating element, an on-off control module, a comparator, and a field-effect tube. Practical working voltage generated when working current flows through an internal resistance is detected by the field-effect tube in real time. Through the comparator, voltage and practical work voltage values are compared and referred, and comparison results are output to the on-off control module. When practical working voltage is lower than reference voltage, the on-off control module outputs high level, the on-off control module makes the field-effect tube keep at conducting state, so that the heating component continues to heat. When the comparator determines that practical working voltage is larger than the reference voltage, the on-off control module outputs low level to the field-effect tube to control the field-effect tube to switch off, so that the heating component is switched off, thereby protecting the electronic cigarette. The control device is simple in structure and low in cost.
Description
Technical field
The utility model relates to the electric heating product scope, relates in particular to a kind of for the overcurrent of electronics cigarette or the control device of short-circuit protection.
Background technology
The electronics cigarette is that a kind of utilization is heated the generation atomizing to tobacco juice, a kind of substitute of cigarette is provided to the smoker, more and more be subjected to smoking consumer's welcome, the electronics tobacco bale is drawn together unit such as battery, control circuit and atomizer and is formed, some electronic cigarette uses the electron gas flow sensor to start heating element, one air-breathingly will make battery control circuit work, and manually induction need the user by next button, smoking then.Electronics cigarette heating element is because contact tobacco juice, humidity, thereby partial short-circuit or dead short circuit situation take place easily, causes internal control circuit overcurrent or short circuit current can occur, as untimely cut-out, can cause internal circuit to burn or fire etc.
At present; in the electronics smoke product of some machinery controls or microprocessor controls; some product does not have overcurrent or short-circuit protection; though some electronics cigarette has overcurrent or short-circuit protection; generally be to use current sensor (for example resistance, current transformer) to detect and have or not overcurrent or short circuit; use the electronics smoke product of current sensor (for example resistance or current transformer), its circuit relative complex, cost increases.
So there is defective in prior art, need to improve.
The utility model content
The technical problems to be solved in the utility model is that at the overcurrent that exists in the prior art or short circuit current complexity, the defective that cost is high provides the conducting internal resistance that utilizes field effect transistor in a kind of electronics cigarette to detect the control device of overcurrent or short-circuit protection.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of overcurrent or short-circuit protection control device for the electronics cigarette; comprise input module; power module and heating element; described heating element heats for the tobacco juice to the electronics cigarette and produces atomizing, it is characterized in that, also comprises switch control module; comparator; field effect transistor, described switch control module link to each other with described input module, described comparator, described field effect transistor and described power module respectively
Described field effect transistor is used for the real work voltage that real-time testing electric current flows through described field effect transistor internal resistance, and described real work voltage is sent to described comparator;
Described comparator exports described comparative result to described switch control module for the reference voltage and the described real work voltage that relatively preset;
Described switch control module is used for controlling described field effect transistor disconnection or making described field effect transistor keep conducting state according to described comparative result;
Described power module is used to described switch control module that power supply is provided and is the power supply of described heating element by described field effect transistor.
Described device, wherein, described comparative result is high level or the low level of described comparator output, when described real work voltage less than described reference voltage, described switch control module output high level, described switch control module is used for making described field effect transistor to keep conducting state, make described heating element continue heating, when described comparator judges that described virtual voltage is greater than described reference voltage, described switch control module output low level to described field effect transistor is controlled described field effect transistor and is disconnected, and makes described heating element outage.
Described device, wherein, described comparator is digital comparator or analog comparator.
Described device, wherein, described reference voltage is the voltage that the overcurrent preset produces in described field effect transistor internal resistance.
Described device wherein, is characterized in that, described switch control module is microcontroller or semiconductor switch.
Described device, wherein, described analog comparator output connects the detection input of described microcontroller, the output of described microcontroller is connected to the grid of described field effect transistor, the source class of described field effect transistor connects the negative pole of described power module, and the drain electrode of described field effect transistor connects input and the described heating element of described comparator respectively.
Described device, wherein, described comparator is built in the described microcontroller.
The utility model discloses control device and the control method of a kind of overcurrent for the electronics cigarette or short-circuit protection, have following beneficial effect: this device utilizes the real-time testing electric current of field effect transistor to flow through the real work voltage that its internal resistance produces; By comparator comparison reference voltage and real work voltage; the output comparative result is to switch control module; when overcurrent or short circuit take place when; disconnection by switch control module control field effect transistor; cut-out detects overcurrent or short-circuit signal to the heating of heating element by the conducting internal resistance that utilizes field effect transistor, and overcurrent or short-circuit protection do not need extra current detecting device; its circuit is simple relatively, and cost is lower.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the circuit block diagram of the control device of the utility model overcurrent or short-circuit protection;
Fig. 2 is the electrical block diagram of the control device embodiment one of the utility model overcurrent or short-circuit protection;
Fig. 3 is the electrical block diagram of the control device embodiment two of the utility model overcurrent or short-circuit protection;
Fig. 4 is the electrical block diagram of the control device embodiment three of the utility model overcurrent or short-circuit protection;
Fig. 5 is the electrical block diagram of the control device embodiment four of the utility model overcurrent or short-circuit protection.
Embodiment
Utilize current sensor (for example resistance, current transformer) to detect to have or not overcurrent or the existing circuit complexity of short-circuit protection, problem that cost is high in the prior art in order to solve, the utility model provides a kind of and utilizes field effect transistor conducting internal resistance to detect overcurrent or short-circuit protection, the core of this utility model is to flow through the real work voltage that its internal resistance produces by the real-time testing electric current of field effect transistor; Come the size of comparison reference voltage and real work voltage by comparator; the output comparative result is to switch control module; when real work voltage during less than described reference voltage; switch control module output high level; switch control module makes field effect transistor keep conducting state; make heating element continue heating; when comparator judges that real work voltage is greater than reference voltage; switch control module output low level to field effect transistor is controlled its disconnection; and then make the heating element outage, reached the effect of protection electronics cigarette.
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
Fig. 1 is the circuit block diagram of the utility model control device, the utility model be utilize in the product be used for control output field effect transistor (MOSFET) when conducting self internal resistance as the current detecting device, identify overcurrent or short circuit with comparator or analog to digital converter (ADC), and close the protection that field effect transistor is carried out circuit, mainly comprise input module 100, switch control module 200, power module 300, field effect transistor 400, heating element 500 and comparator 600, wherein, input module 100 is connected with switch control module 200, input module 100 comprises smoking transducer or button, and smoking sensor sensing user's air-flow starts heating element 500 or user for switch control module 200 1 induced signals and manually sends the signal that needs smoking by button and make heating element 500 heating, smoking then; Switch control module 200 respectively with power module 300, field effect transistor 400 is connected with comparator 600, power module 300 is used to switch control module 200 that power supply is provided, and be that heating element 500 is powered by field effect transistor 400, heating element is used for tobacco juice to the electronics cigarette and heats and produce atomizing, field effect transistor 400 respectively with switch control module 200, power module 300, heating element 500 and comparator 600 connect, be used for the real work voltage that real-time testing electric current flows through field effect transistor 400 internal resistances, and real work voltage is sent to comparator 600; Comparator 600 exports comparative result to switch control module 200 for the reference voltage that relatively presets and the real work voltage of acquisition; Switch control module 200 is used for according to comparative result control field effect transistor 400 disconnections of above-mentioned comparator 600 or makes field effect transistor 400 keep conducting states; Further, described comparative result is high level or the low level of comparator 600 outputs, when real work voltage during less than default reference voltage, switch control module 200 output high level, and then switch control module 200 makes field effect transistor 400 keep conducting state, make heating element 500 continue heating, when comparator 600 is judged virtual voltage greater than reference voltage, switch control module 200 output low levels are to the disconnection of field effect transistor 400 and then control field effect transistor 400, make heating element 500 outages, guaranteed the safety of circuit.
Fig. 2 is the electrical block diagram of the control device embodiment 1 of the utility model overcurrent or short-circuit protection; switch control module is microcontroller 200 among the figure; this microcontroller can be selected single-chip microcomputer for use; CPU or logic control device; microcontroller 200 in the present embodiment includes 5 pins; wherein pin 1 is signal input part; pin 1 links to each other with smoking transducer or button in the input module 100; give pin 1 one signals that are used for starting heating element 500 by smoking transducer or button; pin 2 and pin 5 are power input; for microcontroller 200 provides power supply, pin 3 is output V
GS, being a control of field effect transistor 400 outputs voltage, pin 4 is input V
I, for the comparative result of input comparator 600; Comparator 600 comprises a reference voltage end 2, this reference voltage is a preset value, the voltage that produces in field effect transistor 400 internal resistances by default overcurrent: also have a signal input part 1 and an output 3, the output 3 of comparator 600 links to each other with the pin 4 of microcontroller 200; Field effect transistor 400 comprises gate terminal (G end), source class end (S end) and drain electrode end (D end), the pin 3 of the grid termination microcontroller 200 of field effect transistor 400, the source class end of field effect transistor 400 is battery 300 with power module 300(present embodiment) negative terminal link to each other, the drain electrode end of field effect transistor 400 connects input 1 end of comparator and the negative terminal of heating element 500 respectively, comparator model among this embodiment is LM393 preferably, field effect transistor 400 models are AO3400 or DTS2300 preferably, certainly in the practical application and be limited to above-mentioned selected model.
Fig. 3 is the electrical block diagram of the control device embodiment 2 of the utility model overcurrent or short-circuit protection; this circuit comprises: smoking transducer or button 100(are equivalent to the input module among Fig. 1); semiconductor switch 200; battery 300(is equivalent to the power module 300 among Fig. 1); field effect transistor 400; heating element 500 and comparator 600; wherein in this diagram; except the semiconductor switch 200 that microcontroller among Fig. 2 is replaced with among Fig. 3; the remainder circuit connecting relation is all identical with Fig. 2; only semiconductor switch 200 is connected herein and be described; wherein the signal input part of semiconductor switch 200 (1 end) connects the signal output part of smoking transducer or button; 2 ends of semiconductor switch 200 connect the signal output part 3 of comparator 600; 3 ends of semiconductor switch 200 connect the gate terminal (G end) of field effect transistor 400; it is identical that the annexation of other parts and Fig. 2 describe, so omit.Semiconductor switch 200 receives the instruction of the startup heating element 500 that users send by smoking transducer or button in this enforcement, be that smoking sensor sensing user's air-flow starts heating element 500 or user for semiconductor switch 200 1 induced signals manually to send the signal that needs smoking by button and make heating element 500 heating, smoking then; Its operation principle is with top identical, flows through the real work voltage of field effect transistor 400 internal resistances by real-time testing electric current, and real work voltage is sent to comparator 600; Comparator 600 is for the reference voltage that relatively presets and the real work voltage of acquisition, export comparative result to semiconductor switch 200, semiconductor switch 200 for comparative result control field effect transistor 400 disconnections according to above-mentioned comparator 600, make heating element 500 outages, guaranteed the safety of circuit, perhaps make field effect transistor 400 keep conducting state, make heating element 500 continue heating.
Fig. 4 and Fig. 5 are the control device embodiment 3 of the utility model overcurrent or short-circuit protection and the electrical block diagram of embodiment 4; in this diagram; comparator 600 utilizes analog to digital converter ADC to sample for the internal comparator (as Fig. 4) of microcontroller 200 or microcontroller 200; whether the electric current that field effect transistor 400 is flow through in detection has overcurrent or short circuit; when overcurrent or short circuit generation; microcontroller 200 will cut out field effect transistor 400 does not allow it continue conducting, so just can protect product not damaged by overcurrent or short circuit.
Concrete, to switch control module (microcontroller or semiconductor switch), microcontroller or semiconductor switch disconnect or the maintenance conducting according to comparative result control field effect transistor by comparator output comparative result.If real work voltage is less than the reference voltage that presets, the comparator output low level is to microcontroller or semiconductor switch, microcontroller or semiconductor switch output high level, and then make field effect transistor keep conducting state, if real work voltage is greater than the reference voltage that presets, comparator output high level, microcontroller or semiconductor switch output low level to field effect transistor, control field effect transistor disconnects.
Further process comprises:
1, presses electronics cigarette button or smoking sensor sensing user smoking, give microcontroller one start signal;
2, microcontroller is exported a cut-in voltage (V to the fet gate end
GS), work as V
GSGreater than V
TT(V
TTThreshold voltage for field effect transistor), the field effect transistor conducting, electric current is battery by power module 300() the positive pole D that flows through heating element and flow through field effect transistor holds S to hold battery negative terminal;
3, heating element work is heated condition;
4, the Ui of microcontroller or comparator end detects field effect transistor D terminal voltage, and this voltage is to flow through the value that heating element and field effect transistor electric current I multiply by the field effect transistor internal resistance (the voltage V of ordering to S when the G point by electric current
GSWhen remaining unchanged, this internal resistance value R
oBe a fixed value, Ui=I*R
o);
5, comparator reference voltage input end U
REF,One reference voltage is set, U
REF=I
Overcurrent* R
o
6, work as Ui〉U
REFThe time, I is described〉I
Overcurrent,Comparator or microcontroller action are exported to field effect transistor G terminal voltage, V
GS＜V
TT, field effect transistor is turn-offed, the heating element outage;
In sum; since the field effect transistor (MOSFET) that the utility model is used for control output when conducting self internal resistance as the current detecting device; identify overcurrent or short circuit with comparator or analog to digital converter (ADC); and close field effect transistor; and then heating element is cut off the power supply; the utility model circuit is simple, cost is low, has realized effectively the overcurrent of electronics cigarette or the protection of short circuit.
Therefore, the utility model is not limited to disclosed specific embodiment, and should comprise the whole execution modes that fall in the utility model claim scope.
Claims (9)
1. overcurrent or short-circuit protection control device that is used for the electronics cigarette, comprise input module, power module and heating element, described heating element is used for tobacco juice to the electronics cigarette and heats and produce atomizing, it is characterized in that, also comprise switch control module, comparator and field effect transistor, described switch control module links to each other with described input module, described comparator, described field effect transistor and described power module respectively;
Described field effect transistor is used for the real work voltage that real-time testing electric current flows through described field effect transistor internal resistance, and described real work voltage is sent to described comparator;
Described comparator exports described comparative result to described switch control module for the reference voltage and the described real work voltage that relatively preset;
Described switch control module is used for controlling described field effect transistor disconnection or making described field effect transistor keep conducting state according to described comparative result;
Described power module is used to described switch control module that power supply is provided and is the power supply of described heating element by described field effect transistor.
2. overcurrent according to claim 1 or short-circuit protection control device; it is characterized in that; the described comparative result of described comparator output is high level or low level; described switch control module judgement is worked as described real work voltage less than described reference voltage; described switch control module is exported described high level; described switch control module is used for making described field effect transistor to keep conducting state; make described heating element continue heating; when described comparator judges that described real work voltage is greater than described reference voltage; described switch control module is exported described low level to described field effect transistor; and control described field effect transistor disconnection, make described heating element outage.
3. overcurrent according to claim 1 or short-circuit protection control device is characterized in that, described reference voltage is the voltage that the overcurrent preset produces in described field effect transistor internal resistance.
4. according to the arbitrary described overcurrent of claim 1-3 or short-circuit protection control device, it is characterized in that described switch control module is microcontroller or semiconductor switch.
5. overcurrent according to claim 4 or short-circuit protection control device; it is characterized in that; described comparator output terminal connects the detection input of described microcontroller; the output of described microcontroller is connected to the grid of described field effect transistor; the source class of described field effect transistor connects the negative pole of described power module, and the drain electrode of described field effect transistor connects input and the described heating element of described comparator respectively.
6. overcurrent according to claim 5 or short-circuit protection control device is characterized in that, described comparator is built in the described microcontroller.
7. overcurrent according to claim 6 or short-circuit protection control device is characterized in that, described microcontroller is single-chip microcomputer or CPU.
8. overcurrent according to claim 7 or short-circuit protection control device is characterized in that, described semiconductor switch model is LM393.
9. overcurrent according to claim 8 or short-circuit protection control device is characterized in that, described field effect transistor model is AO3400 or DTS2300.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320099590 CN203166461U (en) | 2013-03-05 | 2013-03-05 | Control device used for overcurrent or short-circuit protection of electronic cigarette |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320099590 CN203166461U (en) | 2013-03-05 | 2013-03-05 | Control device used for overcurrent or short-circuit protection of electronic cigarette |
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| CN203166461U true CN203166461U (en) | 2013-08-28 |
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| CN104037719A (en) * | 2013-03-05 | 2014-09-10 | 向智勇 | Control device and control method for over-current/short-circuit protection of electronic cigarettes |
| WO2014134781A1 (en) * | 2013-03-05 | 2014-09-12 | Xiang Zhiyong | Control device and method for overcurrent or short-circuit protection of electronic cigarette |
| CN104656486A (en) * | 2013-11-18 | 2015-05-27 | 鸿富锦精密工业（深圳）有限公司 | Energy-saving voltage detection circuit |
| GB2528711A (en) * | 2014-07-29 | 2016-02-03 | Nicoventures Holdings Ltd | E-cigarette and re-charging pack |
| GB2528712A (en) * | 2014-07-29 | 2016-02-03 | Nicoventures Holdings Ltd | E-cigarette and re-charging pack |
| GB2529629A (en) * | 2014-08-26 | 2016-03-02 | Nicoventures Holdings Ltd | Electronic aerosol provision system |
| CN106163305A (en) * | 2014-01-27 | 2016-11-23 | Sis资源有限公司 | Electrical steam tells the wire communication in cigarette device |
| CN107404940A (en) * | 2015-04-21 | 2017-11-28 | 惠州市吉瑞科技有限公司深圳分公司 | Atomizer control circuit, electronic cigarette and its atomizer of a kind of electronic cigarette |
| CN107505856A (en) * | 2014-06-19 | 2017-12-22 | 卓尔悦欧洲控股有限公司 | The control method and device of the electronic cigarette of multi-output mode |
| CN110350494A (en) * | 2019-06-28 | 2019-10-18 | 深圳市明信测试设备有限公司 | A kind of direct current protecting method of adjustable protective range |
| CN112087958A (en) * | 2018-05-30 | 2020-12-15 | 菲利普莫里斯生产公司 | Method for detecting heater condition in aerosol-generating system |
| US10874141B2 (en) | 2013-08-20 | 2020-12-29 | VMR Products, LLC | Vaporizer |
| US10986875B2 (en) | 2018-06-25 | 2021-04-27 | Juul Labs, Inc. | Vaporizer device heater control |
| GB2589026A (en) * | 2014-08-26 | 2021-05-19 | Nicoventures Trading Ltd | Electronic aerosol provision system |
| CN113331493A (en) * | 2021-05-08 | 2021-09-03 | 铂德（深圳）科技有限公司 | Short-circuit protection circuit and electron cigarette |
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| CN104037719A (en) * | 2013-03-05 | 2014-09-10 | 向智勇 | Control device and control method for over-current/short-circuit protection of electronic cigarettes |
| WO2014134781A1 (en) * | 2013-03-05 | 2014-09-12 | Xiang Zhiyong | Control device and method for overcurrent or short-circuit protection of electronic cigarette |
| US10874141B2 (en) | 2013-08-20 | 2020-12-29 | VMR Products, LLC | Vaporizer |
| CN104656486A (en) * | 2013-11-18 | 2015-05-27 | 鸿富锦精密工业（深圳）有限公司 | Energy-saving voltage detection circuit |
| CN106163305A (en) * | 2014-01-27 | 2016-11-23 | Sis资源有限公司 | Electrical steam tells the wire communication in cigarette device |
| US10888122B2 (en) | 2014-01-27 | 2021-01-12 | Altria Client Services Llc | Wire communication in an e-vaping device |
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| CN107505856A (en) * | 2014-06-19 | 2017-12-22 | 卓尔悦欧洲控股有限公司 | The control method and device of the electronic cigarette of multi-output mode |
| US10536013B2 (en) | 2014-07-29 | 2020-01-14 | Nicoventures Holdings Limited | E-cigarette and re-charging pack |
| US10873196B2 (en) | 2014-07-29 | 2020-12-22 | Nicoventures Holdings Limited | E-cigarette and re-charging pack |
| GB2528711B (en) * | 2014-07-29 | 2019-02-20 | Nicoventures Holdings Ltd | E-cigarette and re-charging pack |
| US10218193B2 (en) | 2014-07-29 | 2019-02-26 | Nicoventures Holdings Limited | E-cigarette and re-charging pack |
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| AU2015308301B2 (en) * | 2014-08-26 | 2018-03-29 | Nicoventures Trading Limited | Electronic aerosol provision system |
| GB2529629A (en) * | 2014-08-26 | 2016-03-02 | Nicoventures Holdings Ltd | Electronic aerosol provision system |
| GB2529629B (en) * | 2014-08-26 | 2021-05-12 | Nicoventures Trading Ltd | Electronic aerosol provision system |
| GB2589026A (en) * | 2014-08-26 | 2021-05-19 | Nicoventures Trading Ltd | Electronic aerosol provision system |
| GB2589026B (en) * | 2014-08-26 | 2021-08-18 | Nicoventures Trading Ltd | Electronic aerosol provision system |
| US11833294B2 (en) | 2014-08-26 | 2023-12-05 | Nicoventures Trading Limited | Electronic aerosol provision system |
| US11413410B2 (en) | 2014-08-26 | 2022-08-16 | Nicoventures Trading Limited | Electronic aerosol provision system |
| CN107404940A (en) * | 2015-04-21 | 2017-11-28 | 惠州市吉瑞科技有限公司深圳分公司 | Atomizer control circuit, electronic cigarette and its atomizer of a kind of electronic cigarette |
| CN112087958A (en) * | 2018-05-30 | 2020-12-15 | 菲利普莫里斯生产公司 | Method for detecting heater condition in aerosol-generating system |
| US11864596B2 (en) | 2018-05-30 | 2024-01-09 | Philip Morris Products S.A. | Methods for detecting heater conditions in an aerosol-generating system |
| US12127600B2 (en) | 2018-05-30 | 2024-10-29 | Philip Morris Products S.A. | Electrically operated aerosol-generating system and methods for detecting heater conditions in the system |
| US11716789B2 (en) | 2018-06-25 | 2023-08-01 | Juul Labs, Inc. | Vaporizer device heater control |
| US10986875B2 (en) | 2018-06-25 | 2021-04-27 | Juul Labs, Inc. | Vaporizer device heater control |
| CN110350494A (en) * | 2019-06-28 | 2019-10-18 | 深圳市明信测试设备有限公司 | A kind of direct current protecting method of adjustable protective range |
| CN113331493A (en) * | 2021-05-08 | 2021-09-03 | 铂德（深圳）科技有限公司 | Short-circuit protection circuit and electron cigarette |
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