CN105186485B - A kind of misconnection protection circuit - Google Patents
A kind of misconnection protection circuit Download PDFInfo
- Publication number
- CN105186485B CN105186485B CN201510466908.6A CN201510466908A CN105186485B CN 105186485 B CN105186485 B CN 105186485B CN 201510466908 A CN201510466908 A CN 201510466908A CN 105186485 B CN105186485 B CN 105186485B
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- Prior art keywords
- relay
- misconnection
- power supply
- voltage
- input
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- 230000001681 protective effect Effects 0.000 claims abstract description 27
- 230000005611 electricity Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Abstract
The present invention relates to a kind of misconnection to protect circuit, including at least two misconnection protective loops；Each misconnection protective loop includes a controlling brancher and a power supply branch；The controlling brancher includes resistance and relay；The voltage class of the relay is adapted with the grade of input voltage；Energization input is connected after the series connection of the coil of the resistance and relay；The power supply branch includes normally opened contact corresponding with each relay respectively, is connected between energization input and power supply output end after each normally opened contact series connection.The state of corresponding normally opened contact is controlled by relay; only when the input terminal of each misconnection protective loop correctly connects corresponding voltage; all relays could be worked normally; each corresponding multigroup normally opened contact of relay is closed, and the energization input of misconnection protection circuit just can connect to power supply output end.The problem of misconnection can be effectively prevented, improves the safety of power supply.
Description
Technical field
The invention belongs to circuit protection fields, and in particular to a kind of misconnection protection circuit.
Background technology
There are many accurate devices inside instrument and meter, Medical Devices, automotive electronics etc., various voltages is needed, such as 5V and 12V
Deng.However, supply voltage is all polarized, if upon supply voltage is reversed, if input circuit itself is without protection electricity
Road will burn out some components, or even electrolytic capacitor is caused to explode.In addition, supply voltage also has the limitation of voltage range, i.e.,
Keep input polarity connection right, if having accessed higher supply voltage, load and some components can equally be caused to burn.
Protection circuit in the prior art, as shown in Figure 1, reversely accessing negative sense power supply including zener diode ZD1, ZD1
Circuit, anode is by the base stage of resistance R2 connecting triodes Q1, and the collector of Q1 passes through resistance R1, relay K1 accesses negative sense
Current supply circuit；Two auxiliary switches of relay K1 are respectively connected to positive current supply circuit and negative sense current supply circuit.When input terminates
When entering normal, i.e. A is terminated into forward voltage, and B is terminated into negative voltage, and relay K1 operating voltages are negative, are not worked.Work as input
When terminal voltage reversely accesses, i.e. A is terminated into negative voltage, and B is terminated into forward voltage, and relay K1 accesses as forward voltage,
Zener diode also accesses forward voltage, reverse breakdown, and triode Q1 base stages obtain the circuit of ZD1, Q1 conductings, relay K1 bands
Electricity is attracted, the action of two auxiliary switch, the negative voltage at power supply A ends by the one of switches of relay K1 be introduced by
The cathode at electric end, the positive voltage at the ends power supply B are introduced into the anode of receiving end also by relay K1 another switch therein.From
And receiving end is made to obtain correct voltage always.
Although protection circuit in the prior art can be effectively prevented electric voltage reverse-connection by voltage positive and negative anodes polarity switching
The problem of, but misconnection cannot be prevented.For example, if 5V supply voltage mistakes are connected into 12V voltages, load and one will result in
Burning for a little components, causes serious loss.
Invention content
The object of the present invention is to provide a kind of misconnection to protect circuit, cannot prevent to solve protection circuit in the prior art
Only the problem of misconnection.
To achieve the above object, the solution of the present invention includes：
A kind of misconnection protection circuit, including at least two misconnection protective loops；Each misconnection protective loop includes one
Controlling brancher and a power supply branch；The controlling brancher includes resistance and relay；The voltage class of the relay with it is defeated
The grade for entering voltage is adapted；Energization input is connected after the series connection of the coil of the resistance and relay；The power supply branch
Including normally opened contact corresponding with each relay respectively, it is connected to energization input after each normally opened contact series connection and powers defeated
Between outlet.
The coil both ends of the relay are connected in inverse parallel zener diode.
The misconnection protective loop further includes counnter attack diode, the coil of counnter attack diode series resistance and relay,
One end of anode connects energization input, and one end of cathode is connected in series with resistance.
The beneficial effects of the invention are as follows：The state of corresponding normally opened contact is controlled by relay, only when each misconnection
When the input terminal of protective loop correctly connects corresponding voltage, all relays could be worked normally, each relay pair
The multigroup normally opened contact answered all is closed, and the energization input of misconnection protection circuit just can connect to power supply output end.It can be effective
Ground prevents the problem of misconnection, improves the safety of power supply.
Description of the drawings
Fig. 1 is protection circuit diagram in 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.
Specific implementation mode
Embodiment 1
As shown in Fig. 2, the misconnection protection circuit of the embodiment of the present invention 1 includes being arranged in energization input U1, U1- and power supply
Misconnection protective loop 1 between output end U1+, U1-；Setting is in energization input U2, U2- and power supply output end and U2+, U2-
Between misconnection protective loop 2.Energization input connects power supply, power supply output end connection load.
It includes a controlling brancher 1 that misconnection, which protects branch 1,：Positive input U1A by counnter attack diode D1, resistance R1,
The coil of relay J1 connects negative input U1B, the coil of zener diode Z1 reverse parallel connection relays J1；An and confession
Electric branch 1：Positive input U1A connects positive output end U1+ by concatenated switch J1A with J2A.
It includes a controlling brancher 2 that misconnection, which protects branch 2,：Positive input U2A by counnter attack diode D2, resistance R2,
The coil of relay J2 connects negative input U2B, the coil of zener diode Z2 reverse parallel connection relays J2；An and confession
Electric branch 2：Positive input U2A connects positive output end U2+ by concatenated switch J1B with J2B.
Above-mentioned switch J1A and J1B is the normally opened contact of relay J1；Switch J2A and J2B are that the normally opened of relay J2 touches
Point.
Wherein, the breakdown voltage U of zener diode Z1Z1Equal to the normal working voltage of relay J1, relay J1 is ensured
Operating voltage be not more than its rated voltage；Play the role of fly-wheel diode simultaneously, relay J1 coils when preventing power down
Harm caused by the higher inverse electromotive force of both ends production.The resistance value of current-limiting resistance R1In formula, U1
For the voltage of U1 input terminals, UD1For the conduction voltage drop of counnter attack diode D1, IJ1For the running current of relay J1.Voltage stabilizing
The breakdown voltage U of diode Z2Z2Equal to the normal working voltage of relay J1, ensure that the operating voltage of relay J2 is not more than
Its rated voltage；Play the role of fly-wheel diode simultaneously, the production of relay J2 coils both ends is higher reversed when preventing power down
Harm caused by electromotive force.The resistance value of current-limiting resistance R2In formula, U2For the voltage of U2 input terminals,
UD2For the conduction voltage drop of counnter attack diode D2, IJ2For the running current of relay J2.By choosing high-line input voltage etc.
The operating voltage of grade circuit repeat circuit is more than the rated voltage compared with low input grade circuit, can make high-line input voltage
Relay in the grade circuit cisco unity malfunction when inputting low voltage grade.
For convenience of description, it is assumed that U1 input terminals fix access low voltage grade, such as 5V, U2 input terminal fix access compared with
Voltage levels, such as 12V.Then the operating voltage of relay J2 is more than the rated voltage of relay J2.
When normal access, i.e., when U1 input terminals access 5V voltages, U2 input terminals access 12V voltages, relay J1, relay
Device J2 is all in normal working voltage, and all work conducting, and normally opened contact J1A, J1B and J2A, J2B are closed, and input terminal bio-occlusion is defeated
Outlet is powered.
When U1 input terminals access 12V voltages, U2 input terminals access 5V voltages, relay J1 live line works are normally opened to touch
Point J1A and J1B is closed；Relay J2 is not up to operating voltage, therefore relay J2 does not work, and normally opened contact J2A and J2B are
It is off so that the power supply positive input of misconnection protective loop 1 and misconnection protective loop 2 can not all be connected by electricity just
To input terminal, voltage class misconnection defencive function is played.
When U1 input terminals or U2 input terminal polarity power polarity incorrect link, relay J1 or relay J2 can not works
Make, two groups of normally opened contacts of relay J1 or relay J2 are off, and power supply positive input can not be connected by electricity just
To input terminal, protection to error-polarity connection function is played.
In conclusion only when U1 input terminals correctly connect 5V voltages and U2 input terminals correctly connect 12V voltages, relay
Device J1 and relay J2 could be worked normally, and two groups of normally opened contacts of relay J1 and relay J2 are all closed, misconnection protection
The energization input of circuit 1 and misconnection protective loop 2 just can connect to power supply output end.
In the above-described embodiments, the both ends the relay J1 are connected in inverse parallel zener diode Z1, the relay J2
Both ends reverse parallel connection access zener diode Z2.As other embodiment, one in the relay J1 and relay J2
Or two access zener diodes not in parallel.
In the above-described embodiments, the misconnection protective loop 1 by the counnter attack diode D1, the resistance R1 that are connected in series with and after
The coil of electric appliance J1 connects U1 output ends；The misconnection protective loop 2 by the counnter attack diode D2, the resistance R2 that are connected in series with and
The coil of relay J2 connects U2 output ends.As other embodiment, the misconnection protective loop 1 and misconnection protective loop 2
One or two counnter attack diode of not connecting.
Embodiment 2
As shown in figure 3, the misconnection protection circuit includes n group input voltages, then misconnection protection circuit includes corresponding mistake
It connects protective loop 1 and arrives misconnection protective loop n.Each misconnection protective loop all has identical structure, the work of each relay
Voltage is all adapted with input voltage grade.For example, misconnection protective loop n includes a controlling brancher n：Positive input UnA
Negative input UnB, zener diode Zn reverse parallel connections are connected by the coil of counnter attack diode Dn, resistance Rn, relay Jn
The coil of relay Jn；An and power supply branch n：Positive input UnA connects forward direction with JnA by concatenated switch JnA
Output end Un+.Only when the input terminal of each misconnection protective loop correctly connects corresponding voltage, relay J1, relay
Device J2 relays Jn could be worked normally, relay J1, relay J2 relays Jn
Corresponding n groups normally opened contact is all closed, misconnection protective loop 1,2 misconnection protective loop n of misconnection protective loop
Energization input just can connect to power supply output end.
Claims (3)
1. a kind of misconnection protects circuit, it is characterised in that：Including at least two misconnection protective loops；Every misconnection protective loop is equal
Including a controlling brancher and a power supply branch；The controlling brancher includes resistance and relay coil；The relay line
The voltage class of circle is adapted with the grade of input voltage；Energization input is connected after the resistance and relay coil series connection
Anode and the cathode of energization input between；The power supply branch includes normally opened contact corresponding with each relay coil, with
The anode of energization input and the anode of power supply output end are connected to after the corresponding each normally opened contact series connection of each relay coil
Between.
2. misconnection according to claim 1 protects circuit, it is characterised in that：Relay coil both ends reverse parallel connection connects
Connect zener diode.
3. misconnection according to claim 1 protects circuit, it is characterised in that：The misconnection protective loop further includes counnter attack two
One end of pole pipe, counnter attack diode series resistance and relay coil, anode connects energization input, one end series connection of cathode
Connect 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 CN105186485A (en) | 2015-12-23 |
| CN105186485B true CN105186485B (en) | 2018-11-09 |
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Family Applications (1)
| 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 |
Country Status (1)
| Country | Link |
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| CN (1) | CN105186485B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (2)
| 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 |
| 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 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004229414A (en) * | 2003-01-23 | 2004-08-12 | Matsushita Electric Ind Co Ltd | Power supply protective device |
| CN100470993C (en) * | 2007-03-16 | 2009-03-18 | 四川长虹电器股份有限公司 | Circuit system for preventing connector from fault connection |
| CN103532188B (en) * | 2013-09-30 | 2015-04-29 | 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 |
-
2015
- 2015-07-31 CN CN201510466908.6A patent/CN105186485B/en not_active Expired - Fee Related
Patent Citations (2)
| 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 |
| 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 |
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| Publication number | Publication date |
|---|---|
| CN105186485A (en) | 2015-12-23 |
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Granted publication date: 20181109 Termination date: 20190731 |