CN101697410A - Short-circuit protection circuit adopted in battery charger circuit - Google Patents
Short-circuit protection circuit adopted in battery charger circuit Download PDFInfo
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- CN101697410A CN101697410A CN200910207888A CN200910207888A CN101697410A CN 101697410 A CN101697410 A CN 101697410A CN 200910207888 A CN200910207888 A CN 200910207888A CN 200910207888 A CN200910207888 A CN 200910207888A CN 101697410 A CN101697410 A CN 101697410A
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Abstract
The invention discloses a short-circuit protection circuit adopted in a battery charger circuit, which comprises a voltage comparison unit, a detection unit and a linear adjustment unit, wherein the detection unit is connected to an anode of a battery and outputs the voltage of the anode to the voltage comparison unit; the voltage comparison unit outputs a control signal to the linear adjustment unit; the linear adjustment unit is connected to a charging circuit and controls the connection/disconnection of the charging circuit; the detection unit adopts a PNP triode Q3; a base of the triode Q3 is connected to the anode of the battery; an emitter of the triode Q3 is connected to a charging anode circuit through a resistor R4; a resistor R7 is connected between the emitter and the base of the triode Q3; a collector of the triode Q3 is connected to a co-directional input end of the voltage comparison unit; and the collector of the triode Q3 is connected to a charging anode circuit through a resistor R11. The circuit has the advantages of simple structure, low production cost, strong practicability and compatibility, and no impact on power consumption of a charger.
Description
Technical field
The present invention discloses a kind of short-circuit protection circuit, the short-circuit protection circuit that adopts in particularly a kind of battery charger circuit.
Background technology
Along with the application of consumer electronics product in people's life is more and more, the application of lithium battery also increases thereupon, simultaneously, has just brought the charging problem of lithium battery.Because the enhancing of market competition; the requirement of having to reduces for the design cost aspect of product; also want simultaneously to realize the circuit most basic function; as constant current, constant voltage, commentaries on classics lamp, short-circuit protection etc.; in the charger that uses at present; some manufacturer has cancelled last a kind of function (short-circuit protection) in order to save the medicine cost, does product like this and can seem very dangerous.But, the charger that has short-circuit protection function at present all is to have additional short-circuit protection circuit in charging circuit, the most frequently used have following three kinds of schemes: 1, use one three operational amplifier IC, please referring to accompanying drawing 1, in this programme with an operational amplifier U1-3 as detecting unit, the input in the same way of amplifier U1-3 is connected on the anode, reverse input end is connected on the anodal loop of charging, when battery plus-negative plate is short-circuited, the input terminal voltage in the same way of amplifier U1-3 is dragged down, less than reverse input end voltage, and amplifier U1-3 output low level, make amplifier U1-2 reverse input end voltage less than input terminal voltage in the same way, amplifier U1-2 output high level ends triode Q2, and triode Q2 ends triode Q1, and the anodal loop of charging disconnects, stop charging, reach protection; 2, please referring to accompanying drawing 2, utilize an independent short-circuit protection chip to do the short circuit identification protecting, operating principle is identical with first scheme; 3, please referring to accompanying drawing 3, the third scheme is to adopt the DC-DC privacy protection chip that has short-circuit protection function.Though above-mentioned three kinds of schemes can realize short-circuit protection, increase circuit cost that all can be in various degree, and, complex circuit designs, self power consumption is many.
Summary of the invention
Higher at the short-circuit protection circuit cost in the above-mentioned charging circuit of mentioning of the prior art; shortcomings such as self power consumption is many; the invention provides a kind of new short-circuit protection circuit; it utilizes the conducting voltage (UBE) of triode whether to detect short circuit; thereby be used for the action of control amplifier U1-2; realize short-circuit protection, it is simple in structure, and cost is low.
The technical scheme that the present invention solves its technical problem employing is: the short-circuit protection circuit that adopts in a kind of battery charger circuit; comprise voltage comparison unit; detecting unit and linear adjustment unit; detecting unit is connected anode and cathode voltage is exported to voltage comparison unit; voltage comparison unit output control signal is on linear adjustment unit; linear adjustment unit is connected on the charge circuit; the break-make of control charge circuit; detecting unit adopts positive-negative-positive triode Q3; the base stage of triode Q3 is connected on the anode; the emitter of triode Q3 is connected on the anodal loop of charging by resistance R 4; be connected with resistance R 7 between the emitter of triode Q3 and the base stage; the collector electrode of triode Q3 is connected on the input in the same way of voltage comparison unit, and the collector electrode of triode Q3 is connected on the charging negative loop by resistance R 11.
The technical scheme that the present invention solves its technical problem employing further comprises:
Described voltage comparison unit adopts amplifier, charge and be connected in series with resistance R 3 and resistance R 10 between anodal loop and the negative loop, the collector electrode of triode Q3 is connected on the input in the same way of amplifier, the reverse input end of amplifier is connected on the common port of resistance R 3 and resistance R 10, and the output of amplifier is connected on the linear adjustment unit control end.
Described linear adjustment unit adopts positive-negative-positive triode Q2, the base stage of triode Q2 is connected with the output of comparison amplifier, the emitter of triode Q2 is connected on the anodal loop of charging, the collector electrode of triode Q2 is connected by current-limiting resistance R5 on the base stage of triode Q1, and the emitter and collector of triode Q1 is connected on the anodal loop of charging.
The invention has the beneficial effects as follows: circuit structure of the present invention is simple, and production cost is low, and practicality and compatible strong, can be used with most of circuit, can be used as the detection signal input end and the output of interlock circuit.The present invention can not influence the power consumption of charger self in use.
The present invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is scheme one circuit theory diagrams commonly used in the prior art.
Fig. 2 is scheme two circuit theory diagrams commonly used in the prior art.
Fig. 3 is a scheme three-circuit schematic diagram commonly used in the prior art.
Fig. 4 is circuit theory diagrams of the present invention.
Embodiment
Present embodiment is the preferred embodiment for the present invention, and other all its principles are identical with present embodiment or approximate with basic structure, all within protection range of the present invention.
The present invention mainly comprises voltage comparison unit, detecting unit and three parts of linear adjustment unit, please referring to accompanying drawing 4, voltage comparison unit in the present embodiment mainly adopts amplifier U1A, charge and be connected in series with resistance R 3 and resistance R 10 between anodal loop and the charging negative loop, the common port of resistance R 3 and resistance R 10 is connected with the reverse input end of amplifier U1A, be connected in series with resistance R 17 with resistance R 10, the input in the same way of amplifier U1A is connected with the output of detecting unit, and the output of amplifier U1A is connected with the input of linear adjustment unit.In the present embodiment, detecting unit mainly adopts triode Q3, triode Q3 adopts the positive-negative-positive triode, the base stage of triode Q3 directly is connected on the anode, the emitter of triode Q3 is connected on the anodal loop of charging by resistance R 4, be connected with resistance R 7 between the emitter of triode Q3 and the base stage, the collector electrode of triode Q3 directly is connected with the input in the same way of amplifier U1A, and is connected with resistance R 11 between the collector electrode of triode Q3 and the charging negative loop.Remainder is linear adjustment unit in the circuit, be connected in series with resistance R 1 and resistance R 8 between the output of amplifier U1A and the anodal loop of charging, be connected with the base stage of triode Q2 on resistance R 1 and resistance R 8 common ports, in the present embodiment, triode Q2 adopts the positive-negative-positive triode, the emitter of triode Q2 is connected with the anodal loop of charging, the collector electrode of triode Q2 is connected with the base stage of triode Q1 by resistance R 5, in the present embodiment, triode Q1 adopts NPN type triode, the collector and emitter of triode Q1 is connected on the anodal loop of charging, the break-make in the anodal loop of control charging.
The present invention mainly utilizes the conducting voltage of triode, i.e. UBE, generally silicone tube UBE ≈ 0.6-0.7V; Germanium tube UBE ≈ 0.2-0.3V.Among the present invention, under the normal operation, the UBE of triode Q3 is because of the dividing potential drop of resistance R 4 with resistance R 7, UBE is far smaller than 0.6V, not conducting of triode Q3, and amplifier U1A output low level makes triode Q2 conducting, triode Q2 makes triode Q1 conducting, the charge circuit closure, and battery charges normal; As charger output B+, during the B-short circuit, be equivalent to the base earth of triode Q3; at this moment, UBE 〉=0.6V, triode Q3 conducting; with amplifier U1A in the same way input be pulled to high level, voltage is greater than reverse input end voltage, amplifier U1A exports high level; make triode Q2 end; triode Q2 launches very low level, makes triode Q1 end, and the anodal loop of charging disconnects; stop charging, thereby reach protective effect.
Circuit structure of the present invention is simple, and production cost is low, and practicality and compatible strong, can be used with most of circuit, can be used as the detection signal input end and the output of interlock circuit.The present invention can not influence the power consumption of charger self in use.
Claims (3)
1. the short-circuit protection circuit that adopts in the battery charger circuit; comprise voltage comparison unit; detecting unit and linear adjustment unit; detecting unit is connected anode and cathode voltage is exported to voltage comparison unit; voltage comparison unit output control signal is on linear adjustment unit; linear adjustment unit is connected on the charge circuit; the break-make of control charge circuit; it is characterized in that: described detecting unit adopts positive-negative-positive triode Q3; the base stage of triode Q3 is connected on the anode; the emitter of triode Q3 is connected on the anodal loop of charging by resistance R 4; be connected with resistance R 7 between the emitter of triode Q3 and the base stage; the collector electrode of triode Q3 is connected on the input in the same way of voltage comparison unit, and the collector electrode of triode Q3 is connected on the charging negative loop by resistance R 11.
2. the short-circuit protection circuit that adopts in the battery charger circuit according to claim 1; it is characterized in that: described voltage comparison unit adopts amplifier; charge and be connected in series with resistance R 3 and resistance R 10 between anodal loop and the negative loop; the collector electrode of triode Q3 is connected on the input in the same way of amplifier; the reverse input end of amplifier is connected on the common port of resistance R 3 and resistance R 10, and the output of amplifier is connected on the linear adjustment unit control end.
3. the short-circuit protection circuit that adopts in the battery charger circuit according to claim 1; it is characterized in that: described linear adjustment unit adopts positive-negative-positive triode Q2; the base stage of triode Q2 is connected with the output of comparison amplifier; the emitter of triode Q2 is connected on the anodal loop of charging; the collector electrode of triode Q2 is connected by current-limiting resistance R5 on the base stage of triode Q1, and the emitter and collector of triode Q1 is connected on the anodal loop of charging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102078885A CN101697410B (en) | 2009-10-23 | 2009-10-23 | Short-circuit protection circuit adopted in battery charger circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102078885A CN101697410B (en) | 2009-10-23 | 2009-10-23 | Short-circuit protection circuit adopted in battery charger circuit |
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| Publication Number | Publication Date |
|---|---|
| CN101697410A true CN101697410A (en) | 2010-04-21 |
| CN101697410B CN101697410B (en) | 2011-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009102078885A Active CN101697410B (en) | 2009-10-23 | 2009-10-23 | Short-circuit protection circuit adopted in battery charger circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105811376A (en) * | 2014-12-31 | 2016-07-27 | 徐承金 | Short circuit protection and control system of electronic circuit |
| CN106026300A (en) * | 2016-07-26 | 2016-10-12 | 深圳市极客宝贝智能科技有限公司 | Control circuit with compatibility of battery charging protection, channel switching and linear power supply management |
| CN107688133A (en) * | 2017-10-26 | 2018-02-13 | 绵阳高新区探索科技有限责任公司 | Control box has access to electricity short-circuit detecting circuit on charging gun cable |
| CN110892275A (en) * | 2018-09-30 | 2020-03-17 | Oppo广东移动通信有限公司 | System and method for testing charging device |
-
2009
- 2009-10-23 CN CN2009102078885A patent/CN101697410B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105811376A (en) * | 2014-12-31 | 2016-07-27 | 徐承金 | Short circuit protection and control system of electronic circuit |
| CN106026300A (en) * | 2016-07-26 | 2016-10-12 | 深圳市极客宝贝智能科技有限公司 | Control circuit with compatibility of battery charging protection, channel switching and linear power supply management |
| CN107688133A (en) * | 2017-10-26 | 2018-02-13 | 绵阳高新区探索科技有限责任公司 | Control box has access to electricity short-circuit detecting circuit on charging gun cable |
| CN110892275A (en) * | 2018-09-30 | 2020-03-17 | Oppo广东移动通信有限公司 | System and method for testing charging device |
| CN110892275B (en) * | 2018-09-30 | 2022-04-01 | Oppo广东移动通信有限公司 | System and method for testing charging device |
| US11368032B2 (en) | 2018-09-30 | 2022-06-21 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Test system and test method for charging device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101697410B (en) | 2011-12-21 |
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Effective date of registration: 20190905 Address after: 518000 No. 6-6 Yanshan Avenue 101, Yanchuan Community, Yanluo Street, Baoan District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Xinwangda Intelligent Hardware Co., Ltd. Address before: 518000. C building, Shiyan rice field and Fukang industrial area, Shenzhen, Guangdong, Baoan District Patentee before: Sunwoda Electronics Co., Ltd. |
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Address after: 518000 No.101 and 6 / F, No.4 factory building, no.6-6 Yanshan Avenue, Yanluo street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: Shenzhen xinzhiwang Electronic Co., Ltd Address before: 518000 No. 6-6 Yanshan Avenue 101, Yanchuan Community, Yanluo Street, Baoan District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Xinwangda Intelligent Hardware Co.,Ltd. |
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