CN202917939U - Short circuit protection circuit - Google Patents

Short circuit protection circuit Download PDF

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Publication number
CN202917939U
CN202917939U CN 201220328869 CN201220328869U CN202917939U CN 202917939 U CN202917939 U CN 202917939U CN 201220328869 CN201220328869 CN 201220328869 CN 201220328869 U CN201220328869 U CN 201220328869U CN 202917939 U CN202917939 U CN 202917939U
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CN
China
Prior art keywords
triode
circuit
resistance
vin
power input
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CN 201220328869
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Chinese (zh)
Inventor
朱志红
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHENZHEN GOLD POWER TECHNOLOGY Co Ltd
Original Assignee
SHENZHEN GOLD POWER TECHNOLOGY Co Ltd
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Priority to CN 201220328869 priority Critical patent/CN202917939U/en
Application granted granted Critical
Publication of CN202917939U publication Critical patent/CN202917939U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model provides a short circuit protection circuit which is arranged at a load power input end. The short circuit protection circuit comprises a relay and a control circuit, wherein the relay is arranged on a positive electrode connection line of power input and controls the connection between the positive electrode of a power input end and the positive electrode of the load power input end, and the control circuit controls the relay to be disconnected when short circuit occurs at a load end and controls the relay to be closed when the load end recovers. In the short circuit protection circuit of the utility model, under the control of the control circuit, the relay is opened to protect a maintenance circuit when short circuit occurs at the load end, and when a load recovers, the control circuit controls the relay to be closed, and a power supply continues to supply power to the load so as to realize automatic recovery and protection.

Description

A kind of short-circuit protection circuit
Technical field
The utility model relates to short circuit protection field, particularly a kind of short-circuit protection circuit.
Background technology
Short-circuit protection refers to the abnormal conditions (such as short circuit) of some device in can the monitoring circuit, during abnormal, cuts off circuit and also sends warning, prevents from endangering further expansion.Typical short-circuit protection is exactly fuse, and during short circuit, electric current is very large, blown fuse, and just the electricity went off for circuit.
At present; short-circuit protection device such as fuse are through being normally placed on the power supply; as the anodal Vout+ that is arranged on power supply output holds; as the negative pole Vout-of the anodal Vout+ of power supply output and power supply output during owing to specific reasons short circuit not; because electric current strengthens suddenly; can be with blown fuse; having cut off power supply all protects the circuit of power supply itself and back electricity consumption; but this circuit that utilizes blown fuse that power supply is protected needs again to change fuse and just can work on after load end recovers, the usage comparison trouble.
The utility model content
The purpose of this utility model is to provide a kind of circuit that power output end is carried out short-circuit protection; this circuit is when power source loads brings out existing short circuit; cut off the electricity supply circuit and power supply itself are protected; when load restoration; can automatically recover the power supply powering load again, power supply be protected the deficiency of being brought to overcome present use fuse.
The utility model is that the technical scheme that its technical purpose of realization adopts is: a kind of short-circuit protection circuit, be arranged on the load power source input, comprise the described power input of control on the anodal line that is arranged on power supply input anodal with the load power source input anode between the switch that whether is connected, when the load end short circuit, control described switch and disconnect, control the control circuit of described switch closure when load end recovers;
Described switch is relay, and the moving point of described relay and contact connect respectively the anodal and load power source input anode of described power input, the described control circuit of control termination of described relay;
Described control circuit comprises triode Q1, triode Q2, resistance R 1, resistance R 2, resistance R 3;
Described resistance R 3 and resistance R 2 series windings form bleeder circuit, and the described power input of another termination of resistance R 3 is anodal, another termination power input negative pole of resistance R 2;
Described triode Q1 is NPN type triode; The emitter of triode Q1 links to each other with the power input negative pole, the base stage connecting resistance R3 of triode Q1 and the tie point of resistance R 2, and it is anodal that the collector electrode of triode Q1 connects described power input by described relay;
Described triode Q2 is the positive-negative-positive triode; The emitter of triode Q2 links to each other with the base stage of described triode Q1, and the collector electrode of triode Q2 links to each other with the power input negative pole, and the base stage of triode Q2 connects the load power source input anode by resistance R 1.
Further, in the above-mentioned short-circuit protection circuit: also comprise inductance L 1, described inductance L 1 is arranged between the moving point of described power input positive pole and described relay.
Further, in the above-mentioned short-circuit protection circuit: also comprise diode D1, the anode of described diode D1 links to each other with the collector electrode of described triode Q1, and the negative electrode of diode D1 connects the power input positive pole.
In the short-circuit protection circuit of the present utility model; control by control circuit; when the load end short circuit; relay disconnects; described power input front stage circuits is protected, and when load restoration, the control circuit control relay is closed; power supply continues as load supplying, has realized automatic protection and recovery.
Below with reference to drawings and Examples, the utility model is described in detail.
Description of drawings
Fig. 1 is the utility model circuit theory diagrams.
Embodiment
Embodiment 1; as shown in Figure 1; this circuit is one and is arranged on the short-circuit control circuit on the wire between power output end Vin+, Vin+ and load power source input Vout+, the Vout-; when load power source input Vout+, Vout-short circuit; power output end Vin+ and load power source input Vout+ are disconnected; with protection power source and load; as load power source input Vout+, when the Vout-short circuit is resumed; power output end Vin+ is connected with load power source input Vout+, recovers power supply and powers to the load.This control circuit comprises that mainly is arranged on the K switch 1 on the line between power output end Vin+ and the load power source input Vout+, this K switch 1 is exactly a relay R ELAY1 in fact, the moving point of relay R ELAY1 and contact connect respectively the anodal Vin+ of power input and load power source input anode Vout+, the control end connection control circuit of relay R ELAY1; Control circuit comprises triode Q1, triode Q2, resistance R 1, resistance R 2, resistance R 3; Triode Q1 is NPN type triode; The emitter of triode Q1 links to each other with power input negative pole Vin-, and the base stage of triode Q1 tells two
Anodal Vin+ links to each other by resistance R 3 and described power input, and the collector electrode of triode Q1 meets the anodal Vin+ of described power input by described relay R ELAY1; Triode Q2 is the positive-negative-positive triode; The emitter of triode Q2 links to each other with the base stage of described triode Q1, and the collector electrode of triode Q2 links to each other with power input negative pole Vin-, and the base stage of triode Q2 meets load power source input anode Vout+ by resistance R 1.In addition, also comprise inductance L 1, this inductance L 1 is arranged between the moving point of the anodal Vin+ of power input and relay R ELAY1.Also comprise a diode D1, the anode of this diode D1 links to each other with the collector electrode of described triode Q1, and the negative electrode of diode D1 meets the anodal Vin+ of power input.
The concrete use circuit of present embodiment as shown in Figure 1, Vin+ is by inductance L 1, the K switch 1 on the relay R of the flowing through ELAY1 arrives the Vout+ end; Vin-is connected with Vout-is straight-through, and is middle without any device; Resistance R 3 forms potential-divider network control triode Q1 with R2, by the coil of triode Q1 control relay RELAY1 with control switch K1 folding; Triode Q2 control triode Q1.
The specific works process prescription: power input Vin+ forms potential-divider network through resistance R 3 with resistance R 2 and obtains voltage Vb, when the driving threshold values of Vb greater than triode Q1, triode Q1 conducting, K switch 1 closure on the triode Q1 turn-on relay RELAY1, it is the power input Vout+ of load that power input Vin+ arrives output through K1, at this moment, output arrival output is that the power input voltage Vout+ of load equals power input voltage Vin+, triode Q2 cut-off.When short circuit (being that Vout+ and Vout-are shorted together) appears in power end, triode Q2 conducting, this moment Vb=0V, triode Q1 cut-off, the K switch 1 on the relay R ELAY1 disconnects, input terminal voltage can be not influenced because of the output short circuit.Before the output short circuit is not removed, always conducting of triode Q2, triode Q1 cut-off, the K switch 1 on the relay R ELAY1 is in off-state.Remove when the output short circuit, triode Q2 ends, triode Q1 conducting, and K switch 1 closure on the relay R ELAY1, output end voltage equals input terminal voltage; Inductance L 1 prevents that the output transcient short circuit time is on the impact of input.

Claims (3)

1. short-circuit protection circuit, be arranged on the load power source input, it is characterized in that: comprise the switch (K1) that whether is connected between the described power input of control anodal (Vin+) and the load power source input anode (Vout+) on the anodal line that is arranged on power supply input, when the load end short circuit, control described switch (K1) and disconnect, control the closed control circuit of described switch (K1) when load end recovers;
Described switch (K1) is relay (RELAY1), the moving point of described relay and contact connect respectively described power input anodal (Vin+) and load power source input anode (Vout+), the described control circuit of control termination of described relay (RELAY1);
Described control circuit comprises triode Q1, triode Q2, resistance R 1, resistance R 2, resistance R 3;
Described resistance R 3 and resistance R 2 series windings form bleeder circuit, the described power input of another termination of resistance R 3 anodal (Vin+), another termination power input negative pole (Vin-) of resistance R 2;
Described triode Q1 is NPN type triode; The emitter of triode Q1 links to each other with power input negative pole (Vin-), the base stage connecting resistance R3 of triode Q1 and the tie point of resistance R 2, and the collector electrode of triode Q1 connects described power input anodal (Vin+) by described relay (RELAY1);
Described triode Q2 is the positive-negative-positive triode; The emitter of triode Q2 links to each other with the base stage of described triode Q1, and the collector electrode of triode Q2 links to each other with power input negative pole (Vin-), and the base stage of triode Q2 connects load power source input anode (Vout+) by resistance R 1.
2. short-circuit protection circuit according to claim 1 is characterized in that: also comprise inductance L 1, described inductance L 1 is arranged between the moving point of described power input anodal (Vin+) and described relay (RELAY1).
3. short-circuit protection circuit according to claim 1 and 2, it is characterized in that: also comprise diode D1, the anode of described diode D1 links to each other with the collector electrode of described triode Q1, and the negative electrode of diode D1 connects power input positive pole (Vin+).
CN 201220328869 2012-07-09 2012-07-09 Short circuit protection circuit Expired - Lifetime CN202917939U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220328869 CN202917939U (en) 2012-07-09 2012-07-09 Short circuit protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220328869 CN202917939U (en) 2012-07-09 2012-07-09 Short circuit protection circuit

Publications (1)

Publication Number Publication Date
CN202917939U true CN202917939U (en) 2013-05-01

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Application Number Title Priority Date Filing Date
CN 201220328869 Expired - Lifetime CN202917939U (en) 2012-07-09 2012-07-09 Short circuit protection circuit

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CN (1) CN202917939U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104485644A (en) * 2014-11-26 2015-04-01 四川天启智源科技有限公司 Intelligent building energy management system
CN104485647B (en) * 2014-12-23 2018-03-30 青岛歌尔声学科技有限公司 A kind of short-circuit protection circuit and electric supply installation
CN109088391A (en) * 2018-09-18 2018-12-25 Tcl-罗格朗国际电工(惠州)有限公司 Short-circuit protection circuit and nonstandard POE charger

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104485644A (en) * 2014-11-26 2015-04-01 四川天启智源科技有限公司 Intelligent building energy management system
CN104485647B (en) * 2014-12-23 2018-03-30 青岛歌尔声学科技有限公司 A kind of short-circuit protection circuit and electric supply installation
CN109088391A (en) * 2018-09-18 2018-12-25 Tcl-罗格朗国际电工(惠州)有限公司 Short-circuit protection circuit and nonstandard POE charger
CN109088391B (en) * 2018-09-18 2023-10-17 罗格朗智能电气(惠州)有限公司 Short-circuit protection circuit and nonstandard POE power supply

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C14 Grant of patent or utility model
GR01 Patent grant
CP02 Change in the address of a patent holder

Address after: 518000 Floors 1-3 and 1-5 of Block A, Block B2, Jinweiyuan Industrial Plant, Longshan District, Pingshan New District, Shenzhen City, Guangdong Province

Patentee after: SHENZHEN GOLD POWER TECHNOLOGY Co.,Ltd.

Address before: 518000 First, Second and Fifth Floors of B2 Workshop of Fengyeyuan Industrial Plant, Liuxian Second Road, Baocheng 68 District, Baoan District, Shenzhen City, Guangdong Province

Patentee before: SHENZHEN GOLD POWER TECHNOLOGY Co.,Ltd.

CP02 Change in the address of a patent holder
CX01 Expiry of patent term

Granted publication date: 20130501

CX01 Expiry of patent term