CN204190352U - Automatically controlled output short circuit protection circuit - Google Patents
Automatically controlled output short circuit protection circuit Download PDFInfo
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- CN204190352U CN204190352U CN201420723904.2U CN201420723904U CN204190352U CN 204190352 U CN204190352 U CN 204190352U CN 201420723904 U CN201420723904 U CN 201420723904U CN 204190352 U CN204190352 U CN 204190352U
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Abstract
The utility model relates to a kind of automatically controlled output short circuit protection circuit.The utility model is in prior art, to LED, fan, the driving of the peripheral hardwares such as motor needs transistor drive circuit, and this drive circuit easily occurs that when short circuit triode punctures, the problem of hardware can be damaged in production and assembly process and malfunction, one is provided to comprise control module input, power input, output, drive circuit, protective circuit and current-limiting circuit, described control module input is connected with protective circuit, protective circuit respectively with drive circuit, current-limiting circuit and output connect, drive circuit is connected with current input terminal and current-limiting circuit respectively.Resistance current limliting project plan comparison is adopted with tradition; only need to adopt low-power resistance; automatically output is closed after short circuit; no matter be that short circuit repeatedly or long-time short circuit can protective circuits; there is not heating problem; realization is simple, low cost, reaction speed are fast, greatly improves reliability and the fail safe of electric-controlled plate.Be applicable to road protective circuit.
Description
Technical field
The utility model relates to electronic circuit field, particularly short-circuit protection circuit.
Background technology
Along with refrigerator and the development of air-conditioning technical and the raising day by day of living standards of the people, refrigerator and air-conditioning have spread in daily life, electric control refrigerator in the market all detects the temperature of each apotheca by MCU, and realizes the functions such as fresh-keeping and defrosting according to the temperature of user's setting and the peripheral hardware such as internal control rule control air door, electromagnetically operated valve, heater, compressor, LED, fan; Air-conditioning can receive by MCU the information that remote controller sends, testing environment temperature, and controls the peripheral hardwares such as compressor, cross valve, wind deflector and realize heating and the function such as direct-cooled.Transistor drive circuit is needed to the driving of the peripheral hardwares such as LED, fan, motor, and this drive circuit easily occurs that when short circuit triode punctures, and can damage hardware in production and assembly process and malfunction, affects the reliability of complete machine.
Utility model content
Technical problem to be solved in the utility model, is just to provide a kind of automatically controlled output short circuit protection circuit, realizes short-circuit protection to reach, and current-limiting resistance also can use low-power resistance simultaneously, avoids short circuit repeatedly and long-time short circuit to cause the effect of hardware damage.
The utility model solve the technical problem; the technical scheme adopted is; comprise control module input, power input, output, drive circuit, protective circuit and current-limiting circuit; described control module input is connected with protective circuit; protective circuit is connected with drive circuit, current-limiting circuit and output respectively, and drive circuit is connected with current input terminal and current-limiting circuit respectively.
Further; described protective circuit comprises resistance five and diode one; described control module input is connected with one end of resistance five, and the other end of resistance five is connected with the positive pole of drive circuit and diode one respectively, and the negative pole of diode one is connected with current-limiting circuit and output respectively.
Further, described drive circuit comprises resistance one, resistance two, resistance three, resistance four, triode two and triode one, one end of described resistance three is connected with the other end of resistance five, the other end of resistance three is connected with one end of resistance four and the base stage of triode two respectively, the other end of resistance four and the grounded emitter of triode two, the collector electrode of triode two is connected with one end of resistance two, the other end of resistance two is connected with one end of resistance one and the base stage of triode one respectively, the emitter of triode one and the other end of resistance one are connected with power input respectively, the collector electrode of triode one is connected with current-limiting circuit.
Further, described current-limiting circuit is resistance six, and one end of described resistance six is connected with the collector electrode of triode one, and the other end of resistance six is connected with the negative pole of output and diode one respectively.
Further, described resistance six is current-limiting resistance.
The beneficial effects of the utility model are, can short-circuit protection be realized by means of only increase resistance and a diode, when output earth short circuit, triode driving voltage be carried out clamper, thus realizing triode shutoff, protection triode also avoids current-limiting resistance heating to damage;
Resistance current limliting project plan comparison is adopted with tradition; only need to adopt low-power resistance; automatically output is closed after short circuit; no matter be that short circuit repeatedly or long-time short circuit can protective circuits; there is not heating problem; have and realize simple, that low cost, reaction speed are fast advantage, greatly improve reliability and the fail safe of electric-controlled plate.
Accompanying drawing explanation
Fig. 1 is the structure chart of the automatically controlled output short circuit protection circuit of the utility model;
Fig. 2 is the circuit diagram of the automatically controlled output short circuit protection circuit embodiment of the utility model;
Wherein, R1 is resistance one, R2 is resistance two, R3 is resistance three, R4 is resistance four, R5 is resistance five, R6 is resistance six, D1 is diode one, Q1 is triode one, Q2 is triode two.
Embodiment
The technical solution of the utility model is described in detail below in conjunction with drawings and Examples:
The utility model is in prior art, to LED, fan, the driving of the peripheral hardwares such as motor needs transistor drive circuit, and this drive circuit easily occurs that when short circuit triode punctures, hardware can be damaged in production and assembly process and malfunction, affect the problem of the reliability of complete machine, a kind of automatically controlled output short circuit protection circuit is provided, as shown in Figure 1, comprise control module input, power input, output, drive circuit, protective circuit and current-limiting circuit, described control module input is connected with protective circuit, protective circuit respectively with drive circuit, current-limiting circuit and output connect, drive circuit is connected with current input terminal and current-limiting circuit respectively.Can realize short-circuit protection by means of only increase resistance and a diode, when output earth short circuit, triode driving voltage be carried out clamper, thus realize triode shutoff, protection triode also avoids current-limiting resistance heating to damage; Resistance current limliting project plan comparison is adopted with tradition; only need to adopt low-power resistance; automatically output is closed after short circuit; no matter be that short circuit repeatedly or long-time short circuit can protective circuits; there is not heating problem; have and realize simple, that low cost, reaction speed are fast advantage, greatly improve reliability and the fail safe of electric-controlled plate.
Embodiment
The automatically controlled output short circuit protection circuit of this example, as shown in Figure 2, comprise control module input, power input, output, resistance one R1, resistance two R2, resistance three R3, resistance four R4, resistance five R5, resistance six R6, triode one Q1, triode two Q2 and diode one D1, described control module input is connected with one end of resistance five R5, the other end of resistance five R5 is connected with one end of resistance three R3 and the positive pole of diode one D1 respectively, the other end of resistance three R3 is connected with one end of resistance four R4 and the base stage of triode two Q2 respectively, the other end of resistance four R4 and the grounded emitter of triode two Q2, the collector electrode of triode two Q2 is connected with one end of resistance two R2, the other end of resistance two R2 is connected with one end of resistance one R1 and the base stage of triode one Q1 respectively, the emitter of triode one Q1 and the other end of resistance one R1 are connected with power input respectively, the collector electrode of triode one Q1 is connected with one end of resistance six R6, the other end of resistance six R6 is connected with the negative pole of output and diode D1 mono-respectively.
Resistance one R1, resistance two R2, resistance three R3, resistance four R4 and triode two Q2 form the drive circuit of triode one Q1; Resistance six R6 is current-limiting resistance, composition current-limiting circuit; Resistance five R5 and diode one D1 forms protective circuit, and when short circuit, the electric current of diode one D1 is flow through in resistance five R5 restriction.
When normally exporting, single-chip microcomputer sends high level, triode two Q2 conducting is driven by resistance three R3, resistance four R4, resistance five R5 dividing potential drop, now the Vbe of triode two Q2 is 0.7V, after triode two Q2 conducting, resistance one R1 and resistance two R2 forms loop over the ground, now the Vbe of triode one Q1 is-0.7V, triode one Q1 conducting, now 12V outputs to output by resistance six R6 current-limiting resistance, resistance six R6 will select according to output current size, makes the pressure drop on resistance six R6 less, avoids affecting output voltage.
When output earth short circuit, electric current increases instantaneously, needs the time because triode two Q2 turns off, and resistance six R6 can play the effect of Limited Current in the short time.
After short circuit, MCU is driven through resistance five R5 and diode D1 forms loop over the ground, and resistance three R3 and resistance four R4 voltage are clamped at 0.7V, and by the Vbe voltage of resistance three R3 and resistance four R4 dividing potential drop triode two Q2 lower than 0.7V, triode two Q2 turns off.Because triode two Q2 turns off; 12V is disconnected by resistance one R1 and resistance two R2 loop over the ground; the Vbe voltage of triode one Q1 is 0V; triode one Q1 turns off; output turns off thus realizes the effect of short-circuit protection; now do not have electric current to flow through current-limiting resistance six R6, if short trouble does not remove triode one, Q1 will be in off state always.
Claims (5)
1. automatically controlled output short circuit protection circuit; it is characterized in that; comprise control module input, power input, output, drive circuit, protective circuit and current-limiting circuit; described control module input is connected with protective circuit; protective circuit is connected with drive circuit, current-limiting circuit and output respectively, and drive circuit is connected with current input terminal and current-limiting circuit respectively.
2. automatically controlled output short circuit protection circuit according to claim 1; it is characterized in that; described protective circuit comprises resistance five and diode one; described control module input is connected with one end of resistance five; the other end of resistance five is connected with the positive pole of drive circuit and diode one respectively, and the negative pole of diode one is connected with current-limiting circuit and output respectively.
3. automatically controlled output short circuit protection circuit according to claim 2, it is characterized in that, described drive circuit comprises resistance one, resistance two, resistance three, resistance four, triode two and triode one, one end of described resistance three is connected with the other end of resistance five, the other end of resistance three is connected with one end of resistance four and the base stage of triode two respectively, the other end of resistance four and the grounded emitter of triode two, the collector electrode of triode two is connected with one end of resistance two, the other end of resistance two is connected with one end of resistance one and the base stage of triode one respectively, the emitter of triode one and the other end of resistance one are connected with power input respectively, the collector electrode of triode one is connected with current-limiting circuit.
4. automatically controlled output short circuit protection circuit according to claim 3; it is characterized in that; described current-limiting circuit is resistance six, and one end of described resistance six is connected with the collector electrode of triode one, and the other end of resistance six is connected with the negative pole of output and diode one respectively.
5. automatically controlled output short circuit protection circuit according to claim 4, is characterized in that, described resistance six is current-limiting resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420723904.2U CN204190352U (en) | 2014-11-26 | 2014-11-26 | Automatically controlled output short circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420723904.2U CN204190352U (en) | 2014-11-26 | 2014-11-26 | Automatically controlled output short circuit protection circuit |
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| Publication Number | Publication Date |
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| CN204190352U true CN204190352U (en) | 2015-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420723904.2U Active CN204190352U (en) | 2014-11-26 | 2014-11-26 | Automatically controlled output short circuit protection circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787659A (en) * | 2017-01-05 | 2017-05-31 | 科蒂斯技术（苏州）有限公司 | The short-circuit protection circuit that a kind of use P MOS are exported as high-side driver |
| CN107181248A (en) * | 2017-05-31 | 2017-09-19 | 南京懂玫驱动技术有限公司 | A kind of protection circuit of electric vehicle instrument |
| CN110098648A (en) * | 2019-04-24 | 2019-08-06 | 青岛海洋科学与技术国家实验室发展中心 | Energy management system for Oceanic View sounding buoy |
-
2014
- 2014-11-26 CN CN201420723904.2U patent/CN204190352U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787659A (en) * | 2017-01-05 | 2017-05-31 | 科蒂斯技术（苏州）有限公司 | The short-circuit protection circuit that a kind of use P MOS are exported as high-side driver |
| CN107181248A (en) * | 2017-05-31 | 2017-09-19 | 南京懂玫驱动技术有限公司 | A kind of protection circuit of electric vehicle instrument |
| CN107181248B (en) * | 2017-05-31 | 2019-09-20 | 南京懂玫驱动技术有限公司 | A kind of protection circuit of electric vehicle instrument |
| CN110098648A (en) * | 2019-04-24 | 2019-08-06 | 青岛海洋科学与技术国家实验室发展中心 | Energy management system for Oceanic View sounding buoy |
| CN110098648B (en) * | 2019-04-24 | 2023-07-07 | 青岛海洋科技中心 | Energy management system for ocean observation detection buoy |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220210 Address after: 621000, No. 35 Mian Xing Dong Road, hi tech Zone, Sichuan, Mianyang Patentee after: SICHUAN CHANGHONG PRECISION ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 628017 Sichuan Changhong Xinrui Technology Co., Ltd., wangjiaying urban industrial park, Guangyuan Economic Development Zone, Sichuan Province Patentee before: SICHUAN CHANGHONG-SINEW TECHNOLOGY Co.,Ltd. |