CN105186485A - Misconnection protective circuit - Google Patents
Misconnection protective circuit Download PDFInfo
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- CN105186485A CN105186485A CN201510466908.6A CN201510466908A CN105186485A CN 105186485 A CN105186485 A CN 105186485A CN 201510466908 A CN201510466908 A CN 201510466908A CN 105186485 A CN105186485 A CN 105186485A
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- relay
- misconnection
- power supply
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Abstract
The present invention relates to a misconnection protective circuit. The misconnection protective circuit comprises at least two misconnection protective loops. Each protective loop consists of a control branch and a power supply branch. The control branch includes resistors and relays, the voltage classes of the relays fit for the classes of the input voltage, and the coils of the resistors and the relays are connected in series and then connected with a power supply input end. The power supply branch includes normally open contacts with respect to each relay, and each normally open contact is connected in series and then connected between the power supply input end and the power supply output end. States of corresponding normally open contacts are controlled by the relays, only when the input ends of each misconnection protective loop are all correctly connected with corresponding voltages, all the relays may normally work, and when multi-group normally open contacts with respect to each relay are closed, the power supply input end of the misconnection protective circuit may be connected with the power supply output end. According to the invention, the problem of misconnection may be effectively avoided, and the safety of supplying power is improved.
Description
Technical field
The invention belongs to circuit protection field, be specifically related to a kind of misconnection protective circuit.
Background technology
There is a lot of accurate device the inside such as instrument and meter, Medical Devices, automotive electronics, need various voltage, as 5V and 12V etc.But supply power voltage all has polarity, if once supply power voltage connects instead, if input circuit itself does not have protective circuit, some components and parts will be burnt out, even cause electrochemical capacitor to explode.In addition, supply power voltage also has the restriction of voltage range, even if input polarity connection is right, if accessed higher supply power voltage, can cause burning of load and some components and parts equally.
Protective circuit of the prior art, as shown in Figure 1, comprise voltage stabilizing didoe ZD1, ZD1 oppositely accesses negative sense current supply circuit, and its anode is by the base stage of resistance R2 connecting triode Q1, and the collector electrode of Q1 accesses negative sense current supply circuit by resistance R1, relay K 1; Two auxiliary switches of relay K 1 access forward current supply circuit and negative sense current supply circuit respectively.When input access is normal, namely A termination enters forward voltage, and B termination enters negative voltage, and relay K 1 operating voltage is negative, does not work.When input terminal voltage oppositely accesses, namely A termination enters negative voltage, B termination enters forward voltage, relay K 1 access as forward voltage, voltage stabilizing didoe also accesses forward voltage, reverse breakdown, triode Q1 base stage obtains the circuit of ZD1, Q1 conducting, the charged adhesive of relay K 1, two auxiliary switch action, is incorporated into the negative voltage of power supply A end the negative pole of receiving end by one of them switch of relay K 1, the positive voltage of power supply B end is also incorporated into the positive pole of receiving end by relay K 1 another switch wherein.Thus make receiving end obtain correct voltage all the time.
Although protective circuit of the prior art can switch by voltage both positive and negative polarity polarity the problem effectively preventing electric voltage reverse-connection, misconnection can not be prevented.Such as, if 5V supply power voltage mistake is connected into 12V voltage, burning of load and some components and parts will be caused, cause serious loss.
Summary of the invention
The object of this invention is to provide a kind of misconnection protective circuit, the problem of misconnection can not be prevented in order to solve protective circuit of the prior art.
For achieving the above object, the solution of the present invention comprises:
A kind of misconnection protective circuit, comprises at least two misconnection protective loop; Each misconnection protective loop includes a controlling brancher and a power supply branch road; Described controlling brancher comprises resistance and relay; The electric pressure of described relay and the grade of input voltage suitable; Described resistance is connected energization input with after the coils connected in series of relay; Described power supply branch road comprises the normally opened contact corresponding with each relay respectively, is connected between energization input and power supply output after described each normally opened contact series connection.
The coil two ends of described relay are connected in antiparallel voltage stabilizing didoe.
Described misconnection protective loop also comprises counnter attack diode, the coil of counnter attack diode series resistance and relay, and one end of its anode connects energization input, and one end of negative electrode is connected in series resistance.
The invention has the beneficial effects as follows: by the state of normally opened contact corresponding to Control; during the voltage only having the equal exact connect ion of input when each misconnection protective loop corresponding; all relays could all normally work; many groups normally opened contact that each relay is corresponding is closed, and the energization input of misconnection protective circuit just can be connected to power supply output.Effectively can prevent the problem of misconnection, improve the fail safe of power supply.
Accompanying drawing explanation
Fig. 1 is protective circuit figure of the prior art;
Fig. 2 is the circuit diagram of the embodiment of the present invention 1;
Fig. 3 is the circuit diagram of the embodiment of the present invention 2.
Embodiment
Embodiment 1
As shown in Figure 2, the misconnection protective circuit of the embodiment of the present invention 1 comprises and is arranged on energization input U1, U1-and the misconnection protective loop 1 between power supply output U1+, U1-; Be arranged on energization input U2, U2-and power supply output and the misconnection protective loop 2 between U2+, U2-.Energization input connects power supply, and power supply output connects load.
Misconnection protection branch road 1 comprises a controlling brancher 1: positive input U1A connects negative input U1B, the coil of voltage stabilizing didoe Z1 reverse parallel connection relay J 1 by the coil of counnter attack diode D1, resistance R1, relay J 1; And a power supply branch road 1: positive input U1A is connected forward output U1+ by switch J1A with J2A of series connection.
Misconnection protection branch road 2 comprises a controlling brancher 2: positive input U2A connects negative input U2B, the coil of voltage stabilizing didoe Z2 reverse parallel connection relay J 2 by the coil of counnter attack diode D2, resistance R2, relay J 2; And a power supply branch road 2: positive input U2A is connected forward output U2+ by switch J2B with J2B of series connection.
Above-mentioned switch J1A and J1B is the normally opened contact of relay J 1; Switch J2A and J2B is the normally opened contact of relay J 2.
Wherein, the puncture voltage U of voltage stabilizing didoe Z1
z1equal the normal working voltage of relay J 1, ensure that the operating voltage of relay J 1 can not be greater than its rated voltage; Play the effect of fly-wheel diode, the harm that the higher inverse electromotive force that when preventing power down, are produced from relay J 1 coil two ends causes simultaneously.The resistance of current-limiting resistance R1
in formula, U
1for the voltage of U1 input, U
d1for the conduction voltage drop of counnter attack diode D1, I
j1for the running current of relay J 1.The puncture voltage U of voltage stabilizing didoe Z2
z2equal the normal working voltage of relay J 1, ensure that the operating voltage of relay J 2 can not be greater than its rated voltage; Play the effect of fly-wheel diode, the harm that the higher inverse electromotive force that when preventing power down, are produced from relay J 2 coil two ends causes simultaneously.The resistance of current-limiting resistance R2
in formula, U
2for the voltage of U2 input, U
d2for the conduction voltage drop of counnter attack diode D2, I
j2for the running current of relay J 2.Being greater than the rated voltage compared with low input grade loop by the operating voltage choosing high-line input voltage grade loop repeat circuit, the relay cisco unity malfunction when inputting low voltage grade in high-line input voltage grade loop can being made.
For convenience of describing, such as, assuming that U1 input fixing access low voltage grade, 5V, U2 input fixing access high voltage grade, such as 12V.Then the operating voltage of relay J 2 is greater than the rated voltage of relay J 2.
When normally accessing, namely, when U1 input access 5V voltage, U2 input access 12V voltage, relay J 1, relay J 2 are all in normal working voltage, and all work conducting, normally opened contact J1A, J1B and J2A, J2B close, and input bio-occlusion output is powered.
When U1 input access 12V voltage, U2 input access 5V voltage, relay J 1 is with some work, and its normally opened contact J1A and J1B closes; Relay J 2 does not reach operating voltage; therefore relay J 2 does not work; its normally opened contact J2A and J2B is in off-state, makes misconnection protective loop 1 all cannot be connected powered positive input with the power supply positive input of misconnection protective loop 2, plays electric pressure misconnection defencive function.
When U1 input or U2 input polarity power polarity incorrect link; relay J 1 or relay J 2 cannot work; two groups of normally opened contacts of relay J 1 or relay J 2 are in off-state, and power supply positive input cannot connect powered positive input, plays protection to error-polarity connection function.
In sum; only have when U1 input exact connect ion 5V voltage and U2 input exact connect ion 12V voltage time; relay J 1 and relay J 2 could all normally work; two groups of normally opened contacts of relay J 1 and relay J 2 are all closed, and the energization input of misconnection protective loop 1 and misconnection protective loop 2 just can be connected to power supply output.
In the above-described embodiments, described relay J 1 two ends are connected in antiparallel voltage stabilizing didoe Z1, described relay J 2 two ends reverse parallel connection access voltage stabilizing didoe Z2.As other execution modes, one or two access voltage stabilizing didoe not in parallel in described relay J 1 and relay J 2.
In the above-described embodiments, described misconnection protective loop 1 is connected U1 output by counnter attack diode D1, the resistance R1 be connected in series with the coil of relay J 1; Described misconnection protective loop 2 is connected U2 output by counnter attack diode D2, the resistance R2 be connected in series with the coil of relay J 2.As other execution modes, one or two counnter attack diode of not connecting of described misconnection protective loop 1 and misconnection protective loop 2.
Embodiment 2
As shown in Figure 3, described misconnection protective circuit comprises n group input voltage, then misconnection protective circuit road comprises corresponding misconnection protective loop 1 to misconnection protective loop n.Each misconnection protective loop all has identical structure, and the operating voltage of each relay is all suitable with input voltage grade.Such as, misconnection protective loop n comprises a controlling brancher n: positive input UnA and connects negative input UnB, the coil of voltage stabilizing didoe Zn reverse parallel connection relay J n by the coil of counnter attack diode Dn, resistance Rn, relay J n; And one power supply branch road n: positive input UnA is connected forward output Un+ by switch JnA with JnA of series connection.During the voltage only having the equal exact connect ion of input when each misconnection protective loop corresponding; relay J 1, relay J 2 relay J n could all normally work; the n group normally opened contact that relay J 1, relay J 2 relay J n are corresponding is all closed, and the energization input of misconnection protective loop 1, misconnection protective loop 2 misconnection protective loop n just can be connected to power supply output.
Claims (3)
1. a misconnection protective circuit, is characterized in that: comprise at least two misconnection protective loop; Every bar misconnection protective loop includes a controlling brancher and a power supply branch road; Described controlling brancher comprises resistance and relay; The electric pressure of described relay and the grade of input voltage suitable; Described resistance is connected energization input with after the coils connected in series of relay; Described power supply branch road comprises the normally opened contact corresponding with each relay respectively, is connected between energization input and power supply output after described each normally opened contact series connection.
2. misconnection protective circuit according to claim 1, is characterized in that: the coil two ends of described relay are connected in antiparallel voltage stabilizing didoe.
3. misconnection protective circuit according to claim 1; it is characterized in that: described misconnection protective loop also comprises counnter attack diode; the coil of counnter attack diode series resistance and relay, one end of its anode connects energization input, and one end of negative electrode is connected in series resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510466908.6A CN105186485B (en) | 2015-07-31 | 2015-07-31 | A kind of misconnection protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510466908.6A CN105186485B (en) | 2015-07-31 | 2015-07-31 | A kind of misconnection protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105186485A true CN105186485A (en) | 2015-12-23 |
| CN105186485B CN105186485B (en) | 2018-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510466908.6A Expired - Fee Related CN105186485B (en) | 2015-07-31 | 2015-07-31 | A kind of misconnection protection circuit |
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| CN (1) | CN105186485B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896516A (en) * | 2016-06-12 | 2016-08-24 | 许继集团有限公司 | Misconnection protection circuit for two paths of different input voltage grades |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4159503A (en) * | 1976-11-08 | 1979-06-26 | Ross Frederick W | Electric branch-line combiner with grounding |
| JP2004229414A (en) * | 2003-01-23 | 2004-08-12 | Matsushita Electric Ind Co Ltd | Power supply protective device |
| CN101030702A (en) * | 2007-03-16 | 2007-09-05 | 四川长虹电器股份有限公司 | Circuit system for preventing connector from fault connection |
| CN103532188A (en) * | 2013-09-30 | 2014-01-22 | 南京特能电子有限公司 | Electric vehicle storage battery charging process monitoring device |
| CN204068214U (en) * | 2014-06-25 | 2014-12-31 | 重庆市星海电子有限公司 | Storage battery connecting line polarity intelligent identification protecting device |
| CN104333319A (en) * | 2014-11-10 | 2015-02-04 | 许继电气股份有限公司 | Input reverse connection protection circuit for photovoltaic grid-connected inverter |
-
2015
- 2015-07-31 CN CN201510466908.6A patent/CN105186485B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4159503A (en) * | 1976-11-08 | 1979-06-26 | Ross Frederick W | Electric branch-line combiner with grounding |
| JP2004229414A (en) * | 2003-01-23 | 2004-08-12 | Matsushita Electric Ind Co Ltd | Power supply protective device |
| CN101030702A (en) * | 2007-03-16 | 2007-09-05 | 四川长虹电器股份有限公司 | Circuit system for preventing connector from fault connection |
| CN103532188A (en) * | 2013-09-30 | 2014-01-22 | 南京特能电子有限公司 | Electric vehicle storage battery charging process monitoring device |
| CN204068214U (en) * | 2014-06-25 | 2014-12-31 | 重庆市星海电子有限公司 | Storage battery connecting line polarity intelligent identification protecting device |
| CN104333319A (en) * | 2014-11-10 | 2015-02-04 | 许继电气股份有限公司 | Input reverse connection protection circuit for photovoltaic grid-connected inverter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896516A (en) * | 2016-06-12 | 2016-08-24 | 许继集团有限公司 | Misconnection protection circuit for two paths of different input voltage grades |
| CN105896516B (en) * | 2016-06-12 | 2018-11-09 | 许继集团有限公司 | A kind of misconnection protection circuit of two-way difference input voltage grade |
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| Publication number | Publication date |
|---|---|
| CN105186485B (en) | 2018-11-09 |
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Granted publication date: 20181109 Termination date: 20190731 |