CN101826724B - Anti-reverse connection circuit of direct current power supply - Google Patents
Anti-reverse connection circuit of direct current power supply Download PDFInfo
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- CN101826724B CN101826724B CN 201010121102 CN201010121102A CN101826724B CN 101826724 B CN101826724 B CN 101826724B CN 201010121102 CN201010121102 CN 201010121102 CN 201010121102 A CN201010121102 A CN 201010121102A CN 101826724 B CN101826724 B CN 101826724B
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- direct current
- current power
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- triode
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Abstract
The invention provides an anti-reverse connection circuit of a direct current power supply, belonging to the field of electronic circuits. The anti-reverse connection circuit comprises a direct current power supply polarity detection branch circuit, a triode and a switch element, wherein the direct current power supply polarity detection branch circuit is connected between the positive input end and the negative input end of the direct current power supply and is used for detecting whether the direct current power supply is normally connected or reversely connected or not; the base of the triode is connected with the direct current power supply polarity detection branch circuit and the emitter of the triode is connected with the positive input end of the direct current power supply; and the switch element is connected with a load in series and is directly connected between the positive input end and the negative input end of the direct current power supply, and the control end of the switch element is connected with the collector of the triode. Since the switch element which causes no voltage drop is arranged in a path formed by the direct current power supply and the load, and the turning-on or the turning-off of the switch element is controlled according to the normal connection or the reverse connection of the direct current power supply, the invention has the advantages that when the direct current power supply is reversely connected, the electronic components are protected against damages and the overall power consumption of the anti-reverse connection circuit of the direct current power supply is reduced.
Description
Technical field
The invention belongs to electronic circuit field, relate in particular to a kind of anti-reverse connection circuit of direct current power supply.
Background technology
It all is directly to adopt a diode to be serially connected in to prevent in the circuit owing to DC power supply " positive pole " and " negative pole " are damaged electronic devices and components by reversal connection that a lot of circuit are arranged now, as shown in Figure 1, although this anti-reverse technology circuit structure is simple, but the situation for large electric current, loss on the diode D1 is too large, increases the power consumption of whole circuit.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of anti-reverse connection circuit of direct current power supply, is intended to solve the large problem of existing anti-reverse connection circuit of direct current power supply power consumption.
The embodiment of the invention is achieved in that a kind of anti-reverse connection circuit of direct current power supply, comprising:
DC power supply polarity detection branch, it is connected between the positive and negative input of DC power supply, for detection of DC power supply for just connecing or reversal connection;
Triode, its base stage is connected with described DC power supply polarity detection branch, and emitter is connected with described DC power supply positive input terminal;
Switch element, its be connected between the positive and negative input of DC power supply after load is connected in series, its control end is connected with the collector electrode of described triode simultaneously;
Described DC power supply polarity detection branch is detecting DC power supply when just connecing, by controlling described triode conducting so that described switch element is closed; Described DC power supply polarity detection branch is when detecting DC power supply and be reversal connection, and described triode turn-offs so that described switch element is opened by controlling;
Described switch element is a relay, the switch of described relay be connected between the positive and negative input of DC power supply after load is connected in series, the coil of described relay is connected between the negative input end of the collector electrode of described triode and DC power supply;
Described triode is a positive-negative-positive triode; Described DC power supply polarity detection branch comprises:
Be serially connected in successively the first resistance and the second resistance between the positive and negative input of DC power supply;
The base stage of described positive-negative-positive triode is connected to the node between described the first resistance and described the second resistance, and collector electrode then is connected to the coil of relay K 1;
Node between the collector electrode of described positive-negative-positive triode and the described relay coil also is connected to the negative input end of DC power supply by the 3rd resistance.
In the embodiment of the invention; by the path in DC power supply and load formation one switch element without the pressure drop generation is set; and just connecing or turning on and off of this switch element controlled in reversal connection according to DC power supply, thereby reduce the overall power of anti-reverse connection circuit of direct current power supply when can protect electronic devices and components when the DC power supply reversal connection, not to be damaged.
Description of drawings
Fig. 1 is the structure chart of the anti-reverse connection circuit of direct current power supply that provides of prior art;
Fig. 2 is the structure principle chart of the anti-reverse connection circuit of direct current power supply that provides of the embodiment of the invention;
Fig. 3 is a kind of concrete implementation structure figure of anti-reverse connection circuit of direct current power supply shown in Figure 2.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
In the embodiment of the invention, path in DC power supply and load formation arranges a switch element, just connecing for detection of DC power supply or the DC power supply polarity detection branch of reversal connection in DC power supply two ends parallel connection one simultaneously, coming the closed of control switch element according to the testing result of this detection branch or open by a triode.
Fig. 2 shows the structural principle of the anti-reverse connection circuit of direct current power supply that the embodiment of the invention provides, and for convenience of description, only shows the part relevant with the present embodiment.
With reference to Fig. 2, anti-reverse connection circuit of direct current power supply comprises switch element 1, DC power supply polarity detection branch 2, triode Q1, wherein, DC power supply positive input terminal DC+, switch element 1, load RL, DC power supply negative input end DC-are connected in series the formation path successively, DC power supply polarity detection branch 2 is connected between the positive and negative input of DC power supply, for detection of DC power supply for just connecing or reversal connection.DC power supply polarity detection branch 2 is connected with the base stage of triode Q1, and triode Q1 can select the positive-negative-positive triode to realize, its emitter is connected with the DC power supply positive input terminal.The control end of switch element 1 is connected with the collector electrode of triode Q1.DC power supply polarity detection branch 2 is detecting DC power supply when just connecing, and, when detecting DC power supply and be reversal connection, turn-offs so that switch element 1 is opened by control triode Q1 so that switch element 1 closure by control triode Q1 conducting.
Only just control switch element 1 connection when DC power supply just is being connected between the positive and negative input of above-mentioned anti-reverse connection circuit of direct current power supply; thereby can protect electronic devices and components when the DC power supply reversal connection, not to be damaged; simultaneously because switch element 1 does not have pressure drop substantially when connecting; just substantially do not have power consumption yet, thereby can reduce the overall power of reverse-connection preventing circuit.
Fig. 3 shows a kind of concrete implementation structure of the above-mentioned anti-reverse connection circuit of direct current power supply that the embodiment of the invention provides, wherein switch element 1 adopts a relay K 1 to realize, the switch of relay K 1 be connected between the positive and negative input of DC power supply after load is connected in series, the coil of relay K 1 is connected between the negative input end of DC power supply polarity detection branch 2 and DC power supply.
Correspondingly, DC power supply polarity detection branch 2 comprises the first resistance R 1 and the second resistance R 2 that is serially connected in successively between the positive and negative input of DC power supply, the emitter of positive-negative-positive triode Q1 is connected with the DC power supply positive input terminal, base stage is connected to the node between the first resistance R 1 and the second resistance R 2, and collector electrode then is connected to the coil of relay K 1.When the positive and negative input of DC power supply is rectified when connecting DC power supply, electric current flows through the first resistance R 1, the second resistance R 2, so that produce a negative pressure between the base stage of positive-negative-positive triode Q1 and the emitter, positive-negative-positive triode Q1 conducting, electric current flows through the coil of relay K 1, so that the switch closure of relay K 1, thereby the circuit between DC power supply and the load RL is connected.When the positive and negative input `reversed polarity direct current of DC power supply power supply, not conducting of positive-negative-positive triode Q1, the coil no current of relay K 1 passes through, the switch open of relay K 1, thereby the service interruption between DC power supply and the load RL.
Further, node between the collector electrode of positive-negative-positive triode and the described relay coil also is connected to the negative input end of DC power supply by the 3rd resistance R 3, the 3rd resistance R 3 can be closed the remaining energy of absorbing coil of having no progeny at the switch of relay K 1, avoid the coil of relay K 1 to burn out, affect the useful life of relay K 1.
In the embodiment of the invention; by the path in DC power supply and load formation one switch element without the pressure drop generation is set; and just connecing or turning on and off of this switch element controlled in reversal connection according to DC power supply, thereby reduce the overall power of anti-reverse connection circuit of direct current power supply when can protect electronic devices and components when the DC power supply reversal connection, not to be damaged.Wherein, switch element can adopt relay to realize, in order to close the dump energy of the absorbing coil of having no progeny at relay switch, relay coil can also be set be connected to the DC power supply negative input end by a resistance simultaneously.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1. an anti-reverse connection circuit of direct current power supply is characterized in that, comprising:
DC power supply polarity detection branch, it is connected between the positive and negative input of DC power supply, for detection of DC power supply for just connecing or reversal connection;
Triode, its base stage is connected with described DC power supply polarity detection branch, and emitter is connected with described DC power supply positive input terminal;
Switch element, its be connected between the positive and negative input of DC power supply after load is connected in series, its control end is connected with the collector electrode of described triode simultaneously;
Described DC power supply polarity detection branch is detecting DC power supply when just connecing, by controlling described triode conducting so that described switch element is closed; Described DC power supply polarity detection branch is when detecting DC power supply and be reversal connection, and described triode turn-offs so that described switch element is opened by controlling;
Described switch element is a relay, the switch of described relay be connected between the positive and negative input of DC power supply after load is connected in series, the coil of described relay is connected between the negative input end of the collector electrode of described triode and DC power supply;
Described triode is a positive-negative-positive triode; Described DC power supply polarity detection branch comprises:
Be serially connected in successively the first resistance and the second resistance between the positive and negative input of DC power supply;
The base stage of described positive-negative-positive triode is connected to the node between described the first resistance and described the second resistance, and collector electrode then is connected to the coil of relay K 1;
Node between the collector electrode of described positive-negative-positive triode and the described relay coil also is connected to the negative input end of DC power supply by the 3rd resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010121102 CN101826724B (en) | 2010-03-09 | 2010-03-09 | Anti-reverse connection circuit of direct current power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010121102 CN101826724B (en) | 2010-03-09 | 2010-03-09 | Anti-reverse connection circuit of direct current power supply |
Publications (2)
| Publication Number | Publication Date |
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| CN101826724A CN101826724A (en) | 2010-09-08 |
| CN101826724B true CN101826724B (en) | 2013-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010121102 Expired - Fee Related CN101826724B (en) | 2010-03-09 | 2010-03-09 | Anti-reverse connection circuit of direct current power supply |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447391A (en) * | 2010-10-11 | 2012-05-09 | 深圳市金威源科技股份有限公司 | Voltage anode and cathode switching circuit |
| CN102487195B (en) * | 2010-12-03 | 2014-07-16 | 上海博泰悦臻电子设备制造有限公司 | Reversed polarity protection circuit of power supply |
| CN102570840A (en) * | 2010-12-13 | 2012-07-11 | 深圳市金威源科技股份有限公司 | Voltage anode and cathode polarity switching circuit |
| CN102664394B (en) * | 2012-04-25 | 2017-02-08 | 贺川 | Direct current polarity detection and protection circuit module |
| CN103457255B (en) * | 2012-05-31 | 2018-01-23 | 海洋王（东莞）照明科技有限公司 | A kind of circuit for preventing reverse connection of power supply and light fixture |
| CN103683264B (en) * | 2012-08-30 | 2017-10-13 | 深圳市海洋王照明工程有限公司 | A kind of anti-reverse connection circuit of direct current power supply and light fixture |
| CN102970011A (en) * | 2012-11-13 | 2013-03-13 | 海能达通信股份有限公司 | Load device, power line and reverse connection preventing device |
| CN103116108B (en) * | 2013-02-20 | 2015-01-07 | 山东电力集团公司烟台供电公司 | Intelligent detector for direct-current power supply system of transformer substation |
| CN104617773A (en) * | 2013-11-04 | 2015-05-13 | 深圳市海洋王照明工程有限公司 | Positive-negative automatic conversion circuit and power output module |
| CN104795972B (en) * | 2015-05-15 | 2017-04-12 | 泓芯泰业科技(北京)有限公司 | Input current measurement and control circuit |
| CN109991889A (en) * | 2017-12-29 | 2019-07-09 | 深圳光启尖端技术有限责任公司 | The control device and walking robot of walking robot |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101222147A (en) * | 2007-01-14 | 2008-07-16 | 曹先国 | Electric voltage reverse-connection protection circuit |
| CN201312124Y (en) * | 2008-12-09 | 2009-09-16 | 黄敬党 | Protection circuit for preventing accumulator charging and reversal connection |
-
2010
- 2010-03-09 CN CN 201010121102 patent/CN101826724B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101222147A (en) * | 2007-01-14 | 2008-07-16 | 曹先国 | Electric voltage reverse-connection protection circuit |
| CN201312124Y (en) * | 2008-12-09 | 2009-09-16 | 黄敬党 | Protection circuit for preventing accumulator charging and reversal connection |
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| CN101826724A (en) | 2010-09-08 |
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Granted publication date: 20131023 Termination date: 20190309 |