CN201570846U - Bi-feedback DC power short-circuit protection circuit - Google Patents
Bi-feedback DC power short-circuit protection circuit Download PDFInfo
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- CN201570846U CN201570846U CN2009201827618U CN200920182761U CN201570846U CN 201570846 U CN201570846 U CN 201570846U CN 2009201827618 U CN2009201827618 U CN 2009201827618U CN 200920182761 U CN200920182761 U CN 200920182761U CN 201570846 U CN201570846 U CN 201570846U
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Abstract
A bi-feedback DC power short-circuit protection circuit comprises a current feedback circuit, a load feedback circuit, a switch control circuit and an electronic switching device; wherein, the current feedback circuit is connected between the power input ground end and the power output ground end, the load feedback circuit is connected between the power output anode end and the power output ground end, the output ends of the current feedback circuit and the load feedback circuit are all connected with the input end of the switch control circuit, the output end of the switch control circuit is connected with the input end of the electronic switching device, and the electronic switching device is connected between the power input anode end and the power output anode end. The bi-feedback DC power short-circuit protection circuit has the advantages that: as the current feedback and load feedback are adopted, the load feedback circuit can judge whether the load short circuit fault is fixed after the output power voltage is cut off, and the load feedback circuit automatically recovers after the fault is fixed, the impact current caused by the delay auto-recovery is avoided, and the power supply and loads are protected more effectively and reliably.
Description
[technical field]
The utility model is about a kind of power supply short-circuit protective circuit, especially has self-healing short-circuit protection circuit.
[background technology]
In power circuit,, introduced short-circuit protection circuit for overload or the short circuit that prevents load causes the excessive damage that causes load and power supply of loop current.At present, the way that the short-circuit protection of direct voltage source is taked has multiple, commonly adopts the output of electronic switching device control power supply.As accompanying drawing 1, in case when overload or short circuit took place in load, because loop current sharply rises, current feedback circuit produced control signal, turn-offs immediately through switch control delay circuit control electronic switch, cuts off output voltage.After time-delay, the unlocking electronic switch is realized from recovering again.If short trouble is not removed, then produce protection immediately again.Whether the method adopts the mode of only judging output current, in case after the protection, the loop just no longer includes electric current, can't differentiate load faulty and remove, and can only be recovered to connect by delay circuit time-delay back.But under the situation that the load short circuits fault is not removed, just can produce very big impulse current, make current feedback circuit produce protection control again in the moment of recovering to connect.Such impulse current all can produce adverse influence to power supply itself and load.
[utility model content]
Technical problem to be solved in the utility model is to provide a kind of and can avoids fault not remove and recover to produce two feedback DC power supply short-circuit protection circuits of impulse current certainly.
The utility model solves the problems of the technologies described above by the following technical programs: a kind of two feedback DC power supply short-circuit protection circuits; comprise current feedback circuit; ON-OFF control circuit; and electronic switching device; wherein current feedback circuit is connected between power supply input ground and the power supply output ground; the output of current feedback circuit is connected to the input of ON-OFF control circuit; the output of ON-OFF control circuit is connected to the input of electronic switching device; electronic switching device is connected between power supply input positive terminal and the power supply output cathode end; this pair feedback DC power supply short-circuit protection circuit also comprises the load feedback circuit; described load feedback circuit is connected between power supply output cathode end and the power supply output ground, and the output of described load feedback circuit is connected to the input of ON-OFF control circuit.
Described current feedback circuit is made up of transistor Q2, diode D1 and resistance R 1, first end of resistance R 1 links to each other with power supply input ground, second end links to each other with power supply output ground, the anode of diode D1 is connected to second end of resistance R 1, the negative electrode of diode D1 is connected to the base stage of transistor Q2, the emitter of transistor Q2 links to each other with first end of resistance R 1, and the collector electrode of transistor Q2 is connected to ON-OFF control circuit.
Described load feedback circuit is by diode D2, D3, D4, resistance R 4, R5, transistor Q3, Q4, voltage stabilizing didoe DZ3 constitutes, wherein the negative electrode of diode D2 links to each other with power supply output cathode end, its anode links to each other with the base stage of transistor Q4, the anode of diode D3 links to each other with the emitter of transistor Q4, negative electrode links to each other with the anode of diode D4, the negative electrode of diode D4 links to each other with power supply output ground, resistance R 4 one ends link to each other with power supply input positive terminal, the other end links to each other with the base stage of transistor Q4, resistance R 5 one ends link to each other with power supply input positive terminal, the other end links to each other with the collector electrode of transistor Q4 and the negative electrode of voltage stabilizing didoe DZ3, the anode of voltage stabilizing didoe DZ3 links to each other with the base stage of transistor Q3, the emitter of transistor Q3 connects power supply output ground, and collector electrode connects ON-OFF control circuit.
Described ON-OFF control circuit is made of transistor Q1, resistance R 2, R3, voltage stabilizing didoe DZ2, one end of resistance R 3 is connected with power supply input positive terminal, the other end is connected with the base stage of transistor Q1, the negative electrode of voltage stabilizing didoe DZ2 connects the base stage of transistor Q1, anode links to each other with an end of resistance R 2, the other end of resistance R 2 links to each other with the output of current feedback circuit with the load feedback circuit, the emitter of transistor Q1 is connected to power supply input positive terminal, and the collector electrode of transistor Q1 links to each other with the input of electronic switching device.
Described electronic switching device is made of voltage stabilizing didoe DZ1, transistor QV, resistance R 6, the anode of voltage stabilizing didoe DZ1 links to each other with an end of the output of ON-OFF control circuit and resistance R 6, negative electrode links to each other with the base stage of transistor QV, another termination power input ground of resistance R 6, transistor QV emitter connects power supply input positive terminal, and collector electrode connects power supply output cathode end.
Described transistor QV adopts the positive-negative-positive high-power darlington transistors.
The advantage of the two feedback of the utility model DC power supply short-circuit protection circuit is: adopt current feedback and load feedback, can realize overcurrent protection fast and effectively.Whether can differentiate the load short circuits fault and remove cutting off output supply voltage back loading feedback circuit, pending fault, can be more effective, reliable protection power supply and load from recovering if removing the back and realizing having avoided time-delay from the impulse current that recovers to cause.
[description of drawings]
The utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the circuit block diagram of the two feedback of prior art DC power supply short-circuit protection circuit.
Fig. 2 is the circuit block diagram of the two feedback of the utility model DC power supply short-circuit protection circuit.
Fig. 3 is the schematic diagram of the two feedback of the utility model DC power supply short-circuit protection circuit.
[embodiment]
As shown in Figure 2, the two feedback of the utility model DC power supply short-circuit protection circuit comprises current feedback circuit 1, load feedback circuit 2, ON-OFF control circuit 3, electronic switching device 4.Wherein current feedback circuit 1 is connected between power supply input ground and the power supply output ground, load feedback circuit 2 is connected between power supply output cathode end and the power supply output ground, the output of the output of current feedback circuit 1 and load feedback circuit 2 is connected to the input of ON-OFF control circuit 3 simultaneously, the output of ON-OFF control circuit 3 is connected to the input of electronic switching device 4, and electronic switching device 4 is connected between power supply input positive terminal and the power supply output cathode end.
The utility model adopts current feedback and load feedback, realizes dual-feedback short circuit protection.DC power supply is in normal operation by current feedback circuit 1 monitoring loop electric current constantly, in case produce load short circuits, because loop current sharply raises, current feedback circuit 1 just produces protects control signal, and the output of cutting off the electricity supply will no longer include electric current in the loop.Judge by load feedback circuit 2 whether short trouble is removed this moment.After having only short trouble to remove, load feedback circuit 2 can send and control signal to ON-OFF control circuit 3, is realized from recovering by ON-OFF control circuit 3 control electronic switching devices 4, has avoided fault not remove and the impulse current that recovers certainly to produce.
As a specific embodiment, the circuit theory diagrams of the two feedback of the utility model DC power supply short-circuit protection circuit as shown in Figure 3.
Described current feedback circuit 1 is made up of transistor Q2, diode D1 and resistance R 1, and resistance R 1 is connected in the electric power loop, and first end links to each other with power supply input ground, and second end links to each other with power supply output ground.The anode of diode D1 is connected to second end of resistance R 1, the negative electrode of diode D1 is connected to the base stage of transistor Q2, the emitter of transistor Q2 links to each other with first end of resistance R 1, thereby transistor Q2, diode D1 and resistance R 1 constitute the conducting threshold voltage, and the collector electrode of transistor Q2 is connected to ON-OFF control circuit 3.When load short circuits, loop current increases, and makes the generation of resistance R 1 two ends link to each other to hold from power supply with exporting and points to the voltage rising that power supply links to each other with importing and holds.Cause the base stage of diode D1 and transistor Q2 and the PN joint conducting of emitter, move the collector electrode of transistor Q2 to low level, end, cut off output through ON-OFF control circuit 3 control electronic switching devices 4.
When output electronic switching device 4 produces after protection, no longer include electric current on the electric power loop, whether current feedback circuit 1 is the output protection control signal no longer, differentiate the load short circuits fault by load feedback circuit 2 this moment and remove.Described load feedback circuit 2 is made of diode D2, D3, D4, resistance R 4, R5, transistor Q3, Q4, voltage stabilizing didoe DZ3.Wherein the negative electrode of diode D2 links to each other with power supply output cathode end, and its anode links to each other with the base stage of transistor Q4.The anode of diode D3 links to each other with the emitter of transistor Q4, and negative electrode links to each other with the anode of diode D4, and the negative electrode of diode D4 links to each other with power supply output ground.Resistance R 4 one ends link to each other with power supply input positive terminal, the other end links to each other with the base stage of transistor Q4, Q4 provides bias voltage for transistor, resistance R 5 one ends link to each other with power supply input positive terminal, the other end links to each other with the collector electrode of transistor Q4 and the negative electrode of voltage stabilizing didoe DZ3, the anode of voltage stabilizing didoe DZ3 links to each other with the base stage of transistor Q3, and the emitter of transistor Q3 connects power supply output ground, and collector electrode connects ON-OFF control circuit 3.When output short-circuit, D2 drags down the base voltage of Q4, because the emitter of Q4 serial connection D3, D4; cause Q4 to end, input supply voltage provides biasing for the Q3 base stage by R5, DZ3, makes the Q3 conducting; end through ON-OFF control circuit control electronic switch, keep guard mode.When the output short-circuit fault was removed, D2 ended, and caused the Q4 conducting, and the Q4 collector electrode drags down the DZ3 cathode voltage, and DZ3 is ended, thereby Q3 ends, and the release guard state is realized from recovering.
Described ON-OFF control circuit 3 is made of transistor Q1, resistance R 2, R3, voltage stabilizing didoe DZ2, and an end of resistance R 3 and power supply input positive terminal is connected, and the other end is connected with the base stage of transistor Q1, as the pull-up resistor of the base stage of transistor Q1.The negative electrode of voltage stabilizing didoe DZ2 connects the base stage of transistor Q1, and anode links to each other with an end of resistance R 2, and Q1 provides biasing for transistor.The other end of resistance R 2 links to each other with the output of current feedback circuit 1 with load feedback circuit 2, and conduction is by the protection control signal of current feedback circuit 1 and 2 outputs of load feedback circuit.The emitter of transistor Q1 is connected to power supply input positive terminal, and the collector electrode of transistor Q1 links to each other with the input of electronic switching device 4, and the output control signal is controlled the conducting of electronic switching device 4 and ended.
Described electronic switching device 4 is made of voltage stabilizing didoe DZ1, transistor QV, resistance R 6.Wherein transistor QV adopts the positive-negative-positive high-power darlington transistors, the conducting of control output with end.Voltage stabilizing didoe DZ1 conducts control signal, and its anode links to each other with the output of ON-OFF control circuit 3 and an end of resistance R 6, and negative electrode links to each other with the base stage of transistor QV, another termination power input ground of resistance R 6.Transistor QV emitter connects power supply input positive terminal, and collector electrode connects power supply output cathode end.When the unprotect signal; resistance R 6 and voltage stabilizing didoe DZ1 provide biasing for transistor QV; transistor QV conducting; output supply voltage; when ON-OFF control circuit 3 is sent the control signal of high level; because voltage stabilizing didoe DZ1 raises the base-on voltage of transistor QV, causes transistor QV to end, thereby cut off output voltage.
Claims (6)
1. one kind pair is fed back the DC power supply short-circuit protection circuit; comprise current feedback circuit; ON-OFF control circuit; and electronic switching device; wherein current feedback circuit is connected between power supply input ground and the power supply output ground; the output of current feedback circuit is connected to the input of ON-OFF control circuit; the output of ON-OFF control circuit is connected to the input of electronic switching device; electronic switching device is connected between power supply input positive terminal and the power supply output cathode end; it is characterized in that: also comprise the load feedback circuit; described load feedback circuit is connected between power supply output cathode end and the power supply output ground, and the output of described load feedback circuit is connected to the input of ON-OFF control circuit.
2. two feedback DC power supply short-circuit protection circuit as claimed in claim 1; it is characterized in that: described current feedback circuit is made up of transistor Q2, diode D1 and resistance R 1; first end of resistance R 1 links to each other with power supply input ground; second end links to each other with power supply output ground; the anode of diode D1 is connected to second end of resistance R 1; the negative electrode of diode D1 is connected to the base stage of transistor Q2; the emitter of transistor Q2 links to each other with first end of resistance R 1, and the collector electrode of transistor Q2 is connected to ON-OFF control circuit.
3. two feedback DC power supply short-circuit protection circuit as claimed in claim 1; it is characterized in that: described load feedback circuit is by diode D2; D3; D4; resistance R 4; R5; transistor Q3; Q4; voltage stabilizing didoe DZ3 constitutes; wherein the negative electrode of diode D2 links to each other with power supply output cathode end; its anode links to each other with the base stage of transistor Q4; the anode of diode D3 links to each other with the emitter of transistor Q4; negative electrode links to each other with the anode of diode D4; the negative electrode of diode D4 links to each other with power supply output ground; resistance R 4 one ends link to each other with power supply input positive terminal; the other end links to each other with the base stage of transistor Q4; resistance R 5 one ends link to each other with power supply input positive terminal; the other end links to each other with the collector electrode of transistor Q4 and the negative electrode of voltage stabilizing didoe DZ3; the anode of voltage stabilizing didoe DZ3 links to each other with the base stage of transistor Q3; the emitter of transistor Q3 connects power supply output ground, and collector electrode connects ON-OFF control circuit.
4. two feedback DC power supply short-circuit protection circuit as claimed in claim 1; it is characterized in that: described ON-OFF control circuit is by transistor Q1; resistance R 2; R3; voltage stabilizing didoe DZ2 constitutes; one end of resistance R 3 is connected with power supply input positive terminal; the other end is connected with the base stage of transistor Q1; the negative electrode of voltage stabilizing didoe DZ2 connects the base stage of transistor Q1; anode links to each other with an end of resistance R 2; the other end of resistance R 2 links to each other with the output of current feedback circuit with the load feedback circuit; the emitter of transistor Q1 is connected to power supply input positive terminal, and the collector electrode of transistor Q1 links to each other with the input of electronic switching device.
5. two feedback DC power supply short-circuit protection circuit as claimed in claim 1; it is characterized in that: described electronic switching device is made of voltage stabilizing didoe DZ1, transistor QV, resistance R 6; the anode of voltage stabilizing didoe DZ1 links to each other with an end of the output of ON-OFF control circuit and resistance R 6; negative electrode links to each other with the base stage of transistor QV; another termination power input ground of resistance R 6; transistor QV emitter connects power supply input positive terminal, and collector electrode connects power supply output cathode end.
6. two feedback DC power supply short-circuit protection circuit as claimed in claim 5, it is characterized in that: described transistor QV adopts the positive-negative-positive high-power darlington transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201827618U CN201570846U (en) | 2009-09-03 | 2009-09-03 | Bi-feedback DC power short-circuit protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201827618U CN201570846U (en) | 2009-09-03 | 2009-09-03 | Bi-feedback DC power short-circuit protection circuit |
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| CN201570846U true CN201570846U (en) | 2010-09-01 |
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| CN2009201827618U Expired - Fee Related CN201570846U (en) | 2009-09-03 | 2009-09-03 | Bi-feedback DC power short-circuit protection circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102629751A (en) * | 2012-04-26 | 2012-08-08 | 深圳市汉拓数码有限公司 | Over-current protection circuit |
| CN102723692A (en) * | 2012-01-05 | 2012-10-10 | 海信科龙电器股份有限公司 | Overcurrent protection circuit with feedback |
| CN103716022A (en) * | 2012-09-29 | 2014-04-09 | 英飞凌科技股份有限公司 | Electronic circuit with an electronic switch and a monitoring circuit |
| CN103825243A (en) * | 2014-02-26 | 2014-05-28 | 安徽合力股份有限公司 | Circuit overload protector for industrial vehicle |
| CN104184102A (en) * | 2013-05-27 | 2014-12-03 | 海洋王（东莞）照明科技有限公司 | Intrinsic safety energy-limiting circuit and illuminating apparatus |
| CN104518477A (en) * | 2013-09-29 | 2015-04-15 | 凹凸电子（武汉）有限公司 | Circuit protection device, circuit protection method and circuit protection equipment |
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2009
- 2009-09-03 CN CN2009201827618U patent/CN201570846U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723692A (en) * | 2012-01-05 | 2012-10-10 | 海信科龙电器股份有限公司 | Overcurrent protection circuit with feedback |
| CN102629751A (en) * | 2012-04-26 | 2012-08-08 | 深圳市汉拓数码有限公司 | Over-current protection circuit |
| CN102629751B (en) * | 2012-04-26 | 2015-05-13 | 深圳市汉拓数码有限公司 | Over-current protection circuit |
| CN103716022A (en) * | 2012-09-29 | 2014-04-09 | 英飞凌科技股份有限公司 | Electronic circuit with an electronic switch and a monitoring circuit |
| US10074967B2 (en) | 2012-09-29 | 2018-09-11 | Infineon Technologies Ag | Method of operating an electronic circuit with an electronic switch |
| US10727661B2 (en) | 2012-09-29 | 2020-07-28 | Infineon Technologies Ag | Method of operating an electronic circuit with an electronic switch |
| CN104184102A (en) * | 2013-05-27 | 2014-12-03 | 海洋王（东莞）照明科技有限公司 | Intrinsic safety energy-limiting circuit and illuminating apparatus |
| CN104518477A (en) * | 2013-09-29 | 2015-04-15 | 凹凸电子（武汉）有限公司 | Circuit protection device, circuit protection method and circuit protection equipment |
| CN103825243A (en) * | 2014-02-26 | 2014-05-28 | 安徽合力股份有限公司 | Circuit overload protector for industrial vehicle |
| CN103825243B (en) * | 2014-02-26 | 2017-02-15 | 安徽合力股份有限公司 | Circuit overload protector for industrial vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Fuzhou Rui Sheng Jibao Engineering Technology Co. Ltd. is responsible for the patent Document name: Notification that Application Deemed not to be Proposed |
|
| C56 | Change in the name or address of the patentee |
Owner name: FUJIAN RAZENS ELECTRIC POWER TECHNOLOGY CO., LTD. Free format text: FORMER NAME: FUZHOU RUISHENG JIBAO ENGINEERING TECHNOLOGY CO., LTD. |
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| CP03 | Change of name, title or address |
Address after: 350000, No. 14, building E, zone 3-4, Fuzhou Software Park, 89 software Avenue, Gulou District, Fujian, Fuzhou Patentee after: Fujian Razens Electric Power Technology Co., Ltd. Address before: 350000, No. 43, building C, zone 4, Fuzhou Software Park, 89 software Avenue, Gulou District, Fujian, Fuzhou Patentee before: Fuzhou Ruisheng Jibao Engineering Technology Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100901 Termination date: 20140903 |
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| EXPY | Termination of patent right or utility model |