CN203707757U - Overvoltage protection circuit and electronic equipment - Google Patents
Overvoltage protection circuit and electronic equipment Download PDFInfo
- Publication number
- CN203707757U CN203707757U CN201320849967.8U CN201320849967U CN203707757U CN 203707757 U CN203707757 U CN 203707757U CN 201320849967 U CN201320849967 U CN 201320849967U CN 203707757 U CN203707757 U CN 203707757U
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- divider resistance
- output module
- voltage
- power supply
- power input
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Abstract
The utility model discloses an overvoltage protection circuit and electronic equipment. The overvoltage protection circuit comprises a power supply input end, a power supply output end, a detection module and an output module, wherein one end of the detection module is connected with the power supply input end, and the other end is connected with the triggering end of the output module; the input end of the output module is connected with the power supply input end; the output end of the output module is connected with the power supply output end; the detection module is used for detecting the magnitude of the power voltage inputted from the power supply input end and triggering the output module to be off when the detected voltage value is larger than the preset voltage threshold; and the output module is used for outputting power inputted from the power supply input end and stops outputting the power inputted from the power supply input end when the detected module is triggered. Thus, the problems that the power supply system of the electronic equipment is damaged by high voltage during the charging or power supply process in the prior art can be solved, and the circuit structure is simple, and the cost is low.
Description
Technical field
The utility model relates to protective circuit technical field, particularly a kind of overvoltage crowbar and electronic equipment.
Background technology
Along with scientific and technological development, on market, various electronic equipments emerge in an endless stream, and the operation of electronic equipment be unable to do without electric energy, and every kind of electronic equipment has very large dependence to the voltage of power supply, power supply voltage can not arbitrarily change, therefore, general intelligent electronic device all can have and charging or the supplying adapter of its system works voltage matches.Owing to substantially fixing through the supply voltage of power supply adaptor conversion output, if because of carelessness the electronic equipment lower than the normal output supply voltage of this power supply adaptor is connected to power supply or charging with this power supply adaptor, will make the electric power system of this electronic equipment produce overvoltage, now, just may damage the power supply circuits of electronic equipment.And, if lost efficacy with the internal circuit of the supporting charging of this electronic equipment or supplying adapter, while causing output voltage excessive, also can damage the power supply circuits of electronic equipment.In addition, also have some overvoltage crowbars in prior art, but this class circuit is to control by chip, circuit is more complicated, cost is higher.
Foregoing is only understood the technical solution of the utility model for auxiliary, does not represent and admits that foregoing is prior art.
Utility model content
Main purpose of the present utility model, for providing a kind of circuit structure simple and lower-cost overvoltage crowbar, is intended to improve the fail safe of electronic equipment charging or power supply.
For achieving the above object, the utility model proposes a kind of overvoltage crowbar, this overvoltage crowbar comprises power input, power output end, detection module and output module, one end of described detection module is connected with described power input, and the other end is connected with the trigger end of described output module; The input of described output module is connected with described power input, and the output of described output module is connected with described power output end;
Wherein, described detection module, for detection of the supply voltage size from described power input input and in the time that the magnitude of voltage detecting is greater than predetermined voltage threshold, triggers described output module and turn-offs;
Described output module for exporting from the power supply of described power input input, and will stop output from the power supply of described power input input in the time being triggered by described detection module.
Preferably, described detection module comprises the first divider resistance, the second divider resistance, the 3rd current-limiting resistance, voltage-stabiliser tube and the first switching tube, one end of one end of described the first divider resistance, one end of described the second divider resistance and the 3rd current-limiting resistance interconnects between two, the other end of described the first divider resistance is connected with described power input, the other end of described the second divider resistance is connected with the negative electrode of described voltage-stabiliser tube, and the other end of described the 3rd current-limiting resistance is connected with the base stage of described the first switching tube; The plus earth of described voltage-stabiliser tube; The emitter of described the first switching tube is connected with described power input, and collector electrode is connected with the trigger end of described output module.
Preferably, described output module comprises second switch pipe, the 4th divider resistance, the 5th divider resistance and the 6th current-limiting resistance, one end of described the 4th divider resistance, the collector electrode of one end of described the 5th divider resistance, one end of the 6th current-limiting resistance and described the first switching tube interconnects between two, the other end of described the 4th divider resistance is connected with described power input, the other end ground connection of described the 5th divider resistance, the other end of described the 6th current-limiting resistance is connected with the grid of described second switch pipe; The source electrode of described second switch pipe is connected with described power input, and drain electrode is connected with described power output end.
Preferably, described output module also comprises the first electric capacity, and described the first Capacitance parallel connection is connected to the two ends of described the 4th divider resistance.
Preferably, described the first switching tube is triode.
Preferably, described second switch pipe is metal-oxide-semiconductor.
The utility model further provides a kind of electronic equipment, comprise overvoltage crowbar as above, this overvoltage crowbar comprises power input, power output end, detection module and output module, one end of described detection module is connected with described power input, and the other end is connected with the trigger end of described output module; The input of described output module is connected with described power input, and the output of described output module is connected with described power output end; Wherein, described detection module, for detection of the supply voltage size from described power input input and in the time that the magnitude of voltage detecting is greater than predetermined voltage threshold, triggers described output module and turn-offs; Described output module for exporting from the power supply of described power input input, and will stop output from the power supply of described power input input in the time being triggered by described detection module.
The overvoltage crowbar the utility model proposes and electronic equipment, to export from the power supply of described power input input by output module, and detect the supply voltage size of inputting from described power input and in the time that the magnitude of voltage detecting is greater than predetermined voltage threshold, trigger described output module and will stop output from the power supply of described power input input by detection module, thereby realize in the time that input supply voltage is excessive, cut off the power supply of electronic equipment, and realize the object of overvoltage protection, and it is simple that this circuit also has circuit structure, lower-cost advantage.
Brief description of the drawings
Fig. 1 is the circuit block diagram of the utility model overvoltage crowbar preferred embodiment;
Fig. 2 is the electrical block diagram of the utility model overvoltage crowbar preferred embodiment.
Realization, functional characteristics and the advantage of the utility model object, in connection with embodiment, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Shown in Fig. 1 and Fig. 2, Fig. 1 is the circuit block diagram of the utility model overvoltage crowbar preferred embodiment; Fig. 2 is the electrical block diagram of the utility model overvoltage crowbar preferred embodiment.
The utility model provides a kind of overvoltage crowbar, with reference to Fig. 1, in one embodiment, this overvoltage crowbar comprises power input Vin, power output end Vout, detection module 10 and output module 20, one end of described detection module 10 is connected with described power input Vin, and the other end is connected with the trigger end of described output module 20; The input of described output module 20 is connected with described power input Vin, and the output of described output module 20 is connected with described power output end Vout.
Particularly, described detection module 10, for detection of the supply voltage size from described power input Vin input and in the time that the magnitude of voltage detecting is greater than predetermined voltage threshold, triggers described output module 20 and turn-offs.This power input Vin is for being connected with power supply adaptor 30, and so that power supply is inputted, this power output end Vout is for being connected with the electric power system of electronic equipment 40.
Described output module 20 for exporting from the power supply of described power input Vin input, and will stop output from the power supply of described power input Vin input in the time being triggered by described detection module 10.
The utility model circuit will be exported from the power supply of described power input Vin input by output module 20; and detect the supply voltage size of inputting from described power input Vin and in the time that the magnitude of voltage detecting is greater than predetermined voltage threshold, trigger described output module 20 and will stop output from the power supply of described power input Vin input by detection module 10; thereby realize in the time that input supply voltage is excessive; cut off the power supply of electronic equipment 40; and realize the object of overvoltage protection; and it is simple that this circuit also has circuit structure, lower-cost advantage.
Further, with reference to Fig. 2, described detection module 10 comprises the first divider resistance R1, the second divider resistance R2, the 3rd current-limiting resistance R3, voltage-stabiliser tube ZD and the first switching tube Q1.Wherein, by the first divider resistance R1 and the second divider resistance R2, input power is carried out to dividing potential drop to realize conducting and the shutoff of controlling the first switching tube Q1, the size of this first divider resistance R1 and the second divider resistance R2 need to be selected according to the supply power voltage of electronic equipment 40.
Wherein, one end of one end of described the first divider resistance R1, one end of described the second divider resistance R2 and the 3rd current-limiting resistance R3 interconnects between two, the other end of described the first divider resistance R1 is connected with described power input Vin, the other end of described the second divider resistance R2 is connected with the negative electrode of described voltage-stabiliser tube ZD, and the other end of described the 3rd current-limiting resistance R3 is connected with the base stage of described the first switching tube Q1; The plus earth of described voltage-stabiliser tube ZD; The emitter of described the first switching tube Q1 is connected with described power input Vin, and collector electrode is connected with the trigger end of described output module 20.
Be understandable that, in order to facilitate circuit design and to reduce circuit cost, described the first switching tube Q1 is triode.In the present embodiment, be preferably the triode of positive-negative-positive.
Further, with reference to Fig. 1 and Fig. 2, described output module 20 comprises second switch pipe Q2, the 4th divider resistance R4, the 5th divider resistance R5 and the 6th current-limiting resistance R6.In the present embodiment, by the 4th divider resistance R4 and the 5th divider resistance R5 to input to second switch pipe Q2 grid voltage carry out dividing potential drop to drag down the grid voltage of second switch pipe Q2, make source voltage be greater than grid voltage, thereby make second switch pipe Q2 conducting, the size of this first divider resistance R1 and the second divider resistance R2 need to be selected according to the supply power voltage of electronic equipment 40.
Wherein, one end of described the 4th divider resistance R4, the collector electrode of one end of described the 5th divider resistance R5, one end of the 6th current-limiting resistance R6 and described the first switching tube Q1 interconnects between two, the other end of described the 4th divider resistance R4 is connected with described power input Vin, the other end ground connection of described the 5th divider resistance R5, the other end of described the 6th current-limiting resistance R6 is connected with the grid of described second switch pipe Q2; The source electrode of described second switch pipe Q2 is connected with described power input Vin, and drain electrode is connected with described power output end Vout.
Be understandable that, for improving control precision, described second switch pipe Q2 is metal-oxide-semiconductor.In the present embodiment, be preferably the metal-oxide-semiconductor of P raceway groove.
Further, with reference to Fig. 1 and Fig. 2, described output module 20 also comprises the first capacitor C 1, and described the first capacitor C 1 is connected in the two ends of described the 4th divider resistance R4 in parallel.This first capacitor C 1 is for carrying out voltage stabilizing and filtering to circuit.
With reference to Fig. 1 and Fig. 2, the operation principle of the utility model circuit is specific as follows:
Suppose that from the supply voltage of power input Vin input be V0, the supply power voltage of electronic equipment 40 is V1, and the voltage that network a is ordered is Va, and the first switching tube Q1 is triode, and second switch pipe Q2 is metal-oxide-semiconductor.
As Fig. 2, the Veb voltage of the first switching tube Q1: V
eb=V
0-V
b(1), wherein Veb is the saturation voltage drop of the first switching tube Q1, and Vb is the base voltage of the first switching tube Q1;
And, the voltage at R1 two ends: V
r1=V
0-V
a
According to dynatron performance, the electric current that flows through the 3rd current-limiting resistance R3 is very little with respect to the electric current that flows through the first divider resistance R1, so the voltage at the first divider resistance R1 two ends:
Wherein Vzd is the voltage of voltage-stabiliser tube ZD; Because the base current of the first switching tube Q1 is very little, we can think that the voltage at the 3rd current-limiting resistance R3 two ends is substantially the same,
That is: V
a=V
b(3)
From formula (1), formula (2) and formula (3):
1, work as V
ebwhen>=0.7V, had by (4) formula:
That is:
Now, the first switching tube Q1 conducting, the source voltage Vs of second switch pipe Q2 equals grid voltage Vg, second switch pipe Q2 turn-offs, that is: Vs=Vg=V0(6)
, the driving voltage Vgs=Vg-Vs=0V of second switch pipe Q2; Due to not conducting of second switch pipe Q2, can not supply with by second switch pipe Q2 the electric power system of electronic equipment 40 from the supply voltage of power input Vin input.
2,, in the time of Veb<0.7V, had by (4) formula:
Now, the first not conducting of switching tube Q1, the grid voltage of second switch pipe Q2:
So, the driving voltage of second switch pipe Q2:
And regulate the resistance of the 4th divider resistance R4 and the 5th divider resistance R5 and make V
gs≤ V
x<0V(V
xfor the conducting voltage of second switch pipe Q2) time, second switch pipe Q2 conducting, now V1=V0, can be regarded as the output of power supply adaptor 30 from power input Vin() supply voltage V0 electric power system power supply to electronic equipment 40 by second switch pipe Q2 of input.
In sum:
1) when the supply voltage from power input Vin input
Time, the supply voltage of this input is turn-offed by second switch pipe Q2, makes the electric power system of electronic equipment 40 disconnect power supply, thereby plays overvoltage protection effect;
2) when the supply voltage from power input Vin input
Time, second switch pipe Q2 conducting, the supply voltage of this input inputs to the electric power system of electronic equipment 40 to drain electrode through the source electrode of second switch pipe Q2, power.
Thus; the first divider resistance R1, the second divider resistance R2 and the voltage-stabiliser tube ZD of suitable size are set according to the voltage swing correspondence of the power supply of electronic equipment 40; just can be in the time that input voltage exceedes the supply power voltage of this electronic equipment 40; conducting the first switching tube Q1; and then second switch pipe Q2 is turn-offed; make the electric power system of electronic equipment 40 disconnect power supply, thereby realize overvoltage protection.
The utility model also proposes a kind of electronic equipment, and this electronic equipment comprises above-mentioned overvoltage crowbar, and the detailed structure of described overvoltage crowbar can, with reference to above-described embodiment, repeat no more herein.Owing to having used above-mentioned overvoltage crowbar in electronic equipment, therefore, the utility model electronic equipment has power source charges or power supply overvoltage protection ability.
The foregoing is only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model specification and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (7)
1. an overvoltage crowbar, is characterized in that, comprises power input, power output end, detection module and output module, and one end of described detection module is connected with described power input, and the other end is connected with the trigger end of described output module; The input of described output module is connected with described power input, and the output of described output module is connected with described power output end;
Wherein, described detection module, for detection of the supply voltage size from described power input input and in the time that the magnitude of voltage detecting is greater than predetermined voltage threshold, triggers described output module and turn-offs;
Described output module for exporting from the power supply of described power input input, and will stop output from the power supply of described power input input in the time being triggered by described detection module.
2. overvoltage crowbar according to claim 1, it is characterized in that, described detection module comprises the first divider resistance, the second divider resistance, the 3rd current-limiting resistance, voltage-stabiliser tube and the first switching tube, one end of one end of described the first divider resistance, one end of described the second divider resistance and the 3rd current-limiting resistance interconnects between two, the other end of described the first divider resistance is connected with described power input, the other end of described the second divider resistance is connected with the negative electrode of described voltage-stabiliser tube, and the other end of described the 3rd current-limiting resistance is connected with the base stage of described the first switching tube; The plus earth of described voltage-stabiliser tube; The emitter of described the first switching tube is connected with described power input, and collector electrode is connected with the trigger end of described output module.
3. overvoltage crowbar according to claim 2, it is characterized in that, described output module comprises second switch pipe, the 4th divider resistance, the 5th divider resistance and the 6th current-limiting resistance, one end of described the 4th divider resistance, one end of described the 5th divider resistance, one end of the 6th current-limiting resistance and the collector electrode of described the first switching tube interconnect between two, the other end of described the 4th divider resistance is connected with described power input, the other end ground connection of described the 5th divider resistance, the other end of described the 6th current-limiting resistance is connected with the grid of described second switch pipe; The source electrode of described second switch pipe is connected with described power input, and drain electrode is connected with described power output end.
4. overvoltage crowbar according to claim 3, is characterized in that, described output module also comprises the first electric capacity, and described the first Capacitance parallel connection is connected to the two ends of described the 4th divider resistance.
5. overvoltage crowbar according to claim 2, is characterized in that, described the first switching tube is triode.
6. overvoltage crowbar according to claim 3, is characterized in that, described second switch pipe is metal-oxide-semiconductor.
7. an electronic equipment, is characterized in that, comprises the overvoltage crowbar described in any one in claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320849967.8U CN203707757U (en) | 2013-12-20 | 2013-12-20 | Overvoltage protection circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320849967.8U CN203707757U (en) | 2013-12-20 | 2013-12-20 | Overvoltage protection circuit and electronic equipment |
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| Publication Number | Publication Date |
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| CN203707757U true CN203707757U (en) | 2014-07-09 |
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ID=51058139
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|---|---|---|---|
| CN201320849967.8U Expired - Fee Related CN203707757U (en) | 2013-12-20 | 2013-12-20 | Overvoltage protection circuit and electronic equipment |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104316952A (en) * | 2014-11-03 | 2015-01-28 | 绵阳市维博电子有限责任公司 | Whole body surface contamination monitor and over-voltage protection method thereof |
| CN104319992A (en) * | 2014-09-22 | 2015-01-28 | 矽力杰半导体技术(杭州)有限公司 | Differential circuit and integrated circuit using same |
| CN105262073A (en) * | 2015-10-27 | 2016-01-20 | 深圳市鑫华邦科技有限公司 | Television and flat PC integrated machine |
| CN106058798A (en) * | 2016-05-30 | 2016-10-26 | 安徽华米信息科技有限公司 | Voltage protection device, method and wearable device |
| CN106786466A (en) * | 2017-02-13 | 2017-05-31 | 深圳市沃特沃德股份有限公司 | A kind of power supply overvoltage protection circuit, power module and mobile terminal |
| CN106849017A (en) * | 2017-03-03 | 2017-06-13 | 广东欧珀移动通信有限公司 | Power circuit, power amplification system and over-voltage protection method |
| CN109032234A (en) * | 2018-10-08 | 2018-12-18 | 北方电子研究院安徽有限公司 | The constant-current source device of voltage limit thresholding |
| CN109104085A (en) * | 2018-10-08 | 2018-12-28 | 北方电子研究院安徽有限公司 | A kind of wide input voltage power supply unit |
| WO2021232444A1 (en) * | 2020-05-20 | 2021-11-25 | 南京盖乐普电子科技有限公司 | Charging protection circuit for juicer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104319992B (en) * | 2014-09-22 | 2017-06-16 | 矽力杰半导体技术(杭州)有限公司 | Differential circuit and apply its integrated circuit |
| CN104319992A (en) * | 2014-09-22 | 2015-01-28 | 矽力杰半导体技术(杭州)有限公司 | Differential circuit and integrated circuit using same |
| CN104316952A (en) * | 2014-11-03 | 2015-01-28 | 绵阳市维博电子有限责任公司 | Whole body surface contamination monitor and over-voltage protection method thereof |
| CN104316952B (en) * | 2014-11-03 | 2017-07-07 | 绵阳市维博电子有限责任公司 | A kind of whole body surface pollution monitor and its over-voltage protection method |
| CN105262073A (en) * | 2015-10-27 | 2016-01-20 | 深圳市鑫华邦科技有限公司 | Television and flat PC integrated machine |
| CN106058798A (en) * | 2016-05-30 | 2016-10-26 | 安徽华米信息科技有限公司 | Voltage protection device, method and wearable device |
| CN106058798B (en) * | 2016-05-30 | 2019-03-15 | 安徽华米信息科技有限公司 | Voltage protection, method and wearable device |
| CN106786466A (en) * | 2017-02-13 | 2017-05-31 | 深圳市沃特沃德股份有限公司 | A kind of power supply overvoltage protection circuit, power module and mobile terminal |
| CN106786466B (en) * | 2017-02-13 | 2019-04-05 | 深圳市沃特沃德股份有限公司 | A kind of power supply overvoltage protection circuit, power module and mobile terminal |
| CN106849017A (en) * | 2017-03-03 | 2017-06-13 | 广东欧珀移动通信有限公司 | Power circuit, power amplification system and over-voltage protection method |
| CN109032234A (en) * | 2018-10-08 | 2018-12-18 | 北方电子研究院安徽有限公司 | The constant-current source device of voltage limit thresholding |
| CN109104085A (en) * | 2018-10-08 | 2018-12-28 | 北方电子研究院安徽有限公司 | A kind of wide input voltage power supply unit |
| CN109104085B (en) * | 2018-10-08 | 2020-06-23 | 北方电子研究院安徽有限公司 | Wide input voltage power supply device |
| WO2021232444A1 (en) * | 2020-05-20 | 2021-11-25 | 南京盖乐普电子科技有限公司 | Charging protection circuit for juicer |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140709 Termination date: 20201220 |