CN207218244U - A kind of direct current reverse-connection preventing circuit - Google Patents
A kind of direct current reverse-connection preventing circuit Download PDFInfo
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- CN207218244U CN207218244U CN201721129531.6U CN201721129531U CN207218244U CN 207218244 U CN207218244 U CN 207218244U CN 201721129531 U CN201721129531 U CN 201721129531U CN 207218244 U CN207218244 U CN 207218244U
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Abstract
A kind of direct current reverse-connection preventing circuit, including relay and anti-reverse diode, including relay and anti-reverse diode, the anti-reverse diode cathode connection power supply negative input end, negative pole connect the coil of the relay, the other end connection power supply positive input terminal of the relay coil, the contact portion power supply negative output terminal or positive output end of the relay, contact are normally-closed contact.This practicality is newly by setting anti-reverse diode, relay, when power positive cathode is reversed, power source for relay control positive pole or power cathode open circuit, realizes the protection to load and power supply, avoids because of infringement of the reverse power connection to late-class circuit and power supply.Have the advantages that electricity piece cost is low, simple in construction, low in energy consumption.And possesses reversal connection indicator function.
Description
Technical field
A kind of circuit is the utility model is related to, more particularly to a kind of direct current reverse-connection preventing circuit.
Background technology
In the development process of all electronic equipment or product, power supply is essential part, and is made
With frequency highest composition, especially in exploitation and test phase, frequently break-make power supply is essential process.Frequently
During connecting power supply and removing power supply, the situation of power line reversal connection inevitably occurs, that is, misses power line just
Negative pole is reversed, if circuit does not have enough safeguard measures, will burn late-class circuit or power supply, or power supply and rear class occur
Circuit burns simultaneously, causes device and waste of time, extends the development time, improves development cost, sometimes can even cause
Potential safety hazard.
The existing frequently-used method for preventing reverse power connection mainly has following several：1st, counnter attack connector；This method is most
Minimum also the most frequently used method of simple cost, but be usually to be used as finished product to use, because being difficult to after the occlusion of this connector
Separate, be inconvenient for needing the exploitation place of frequent fractionation；2nd, the reversal connection diode of power inlet；This method is
Through conventional method in exploitation, but this protection circuit power consumption is larger, without obvious warning device, easily burns power supply；
3rd, protective tube；Although can largely protection circuit, change trouble, simultaneously for Sensitive Apparatus, protection
DeGrain；4th, self-protection circuit；This circuit is typically designed in power end, and anti-short-circuit state is cut off the electricity supply output, typically
It is the self-protection circuit for doing circuit.
Utility model content
Main purpose of the present utility model is to solve the larger technical problem of reverse-connection preventing circuit power consumption, there is provided a kind of direct current
Reverse-connection preventing circuit.
To achieve the above object, the technical solution of the utility model is：
A kind of direct current reverse-connection preventing circuit, including relay and anti-reverse diode, including relay and anti-reverse diode,
The anti-reverse diode cathode connection power supply negative input end, negative pole connect the coil of the relay, the relay coil
The other end connection power supply positive input terminal, the contact portion power supply negative output terminal or positive output end of the relay, contact is normal
Closed contact.
Further, the common of the relay is connected with power supply negative input end, normally-closed contact connects power supply negative output
End, normally opened contact sky connect.
Further, the common of the relay is connected with power supply positive input terminal, normally-closed contact connects power supply positive output
End, normally opened contact sky connect.
Further, the anti-reverse diode is light emitting diode.
Further, in positive pole one current-limiting resistance of series connection of anti-reverse diode.
To sum up content, a kind of direct current reverse-connection preventing circuit described in the utility model, by setting anti-reverse diode, relay
Device, when power positive cathode is reversed, power source for relay control positive pole or power cathode open circuit, realize the guarantor to load and power supply
Shield, is avoided because of infringement of the reverse power connection to late-class circuit and power supply.With that electricity piece cost is low, simple in construction, power consumption is low etc. is excellent
Point.And possesses reversal connection indicator function.
Brief description of the drawings
Fig. 1 is the circuit diagram of the utility model embodiment one；
Fig. 2 is the circuit diagram of the utility model embodiment two.
Embodiment
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings：
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.
Embodiment one
As shown in figure 1, a kind of direct current reverse-connection preventing circuit described in the utility model, mainly includes relay K, anti-reverse two
Pole pipe D, current-limiting resistance R.
Wherein, relay K is electric current relay, includes coil and contact, for controlling the negative or positive electrode of power supply to lead
Switching road.Anti-reverse diode D, it has unilateral conduction, to protection circuit.Current-limiting resistance R is used for differential pressure drop stream.
In the present embodiment, anti-reverse diode D connects with relay K coil, anti-reverse diode D and relay K
Coil series connection after be arranged between power supply positive input terminal and negative input end.Anti-reverse diode D positive pole connection power supply is born defeated
Enter end, anti-reverse diode D negative pole contact relay K coil, the other end connection power supply positive input terminal of relay K coils.
Relay K common is connected with power supply negative input end, normally-closed contact connection power supply negative output terminal, normally opened contact
Sky connects.
When the connection of DC supply input both positive and negative polarity is correct, due to anti-reverse diode D presence, therefore relay K
Coil no power, relay K normally-closed contacts connection power supply negative input end and negative output terminal, power supply normal power supply.In normal work
When, reverse-connection preventing circuit does not produce power consumption.
When DC supply input both positive and negative polarity is reversed, electric current flows through current-limiting resistance R, anti-reverse diode D, relay K
Coil, make relay K coil electricity, relay K normally-closed contact disconnects, and power supply is served counnter attack from normal power supply
Connect effect.
Anti-reverse diode D positive pole series limiting resistor R, current-limiting resistance R both ends connect power supply negative input end respectively
With anti-reverse diode D positive pole.The electric current for flowing through anti-reverse diode D can be effectively reduced by current-limiting resistance R, plays protection
The effect of circuit.
Anti-reverse diode D uses light emitting diode, when DC supply input both positive and negative polarity is reversed, LEDs ON
It is luminous so that reverse-connection preventing circuit possesses reversal connection prompt facility.
Embodiment two
As shown in Fig. 2 in the present embodiment, anti-reverse diode D connects with relay K coil, anti-reverse diode D
It is arranged on after being connected with relay K coil between power supply positive input terminal and negative input end.Anti-reverse diode D positive pole connection
Power supply negative input end, anti-reverse diode D negative pole contact relay K coil, the other end connection power supply of relay K coils is just
Input.
Relay K common is connected with power supply positive input terminal, normally-closed contact connection power supply positive output end, normally opened contact
Sky connects.
When the connection of DC supply input both positive and negative polarity is correct, due to anti-reverse diode D presence, therefore relay K
Coil no power, relay K normally-closed contacts connection power supply positive input terminal and positive output end, power supply normal power supply.In normal work
When, reverse-connection preventing circuit does not produce power consumption.
When DC supply input both positive and negative polarity is reversed, electric current flows through current-limiting resistance R, anti-reverse diode D, relay K
Coil, make relay K coil electricity, relay K normally-closed contact disconnects, and power supply is served counnter attack from normal power supply
Connect effect.
Embodiment three
Reverse-connection preventing circuit in the present embodiment includes anti-reverse diode D, and its positive pole connects power input, and its negative pole connects negative
Carry, relay K is attempted by anti-reverse diode D.Relay K is electromagnetic relay.
Anti-reverse diode D is in parallel with relay K after being connected with thermistor, anti-reverse diode D negative pole and temperature-sensitive
One end of resistance is connected, another terminating load of thermistor, the positive pole phase of relay K movable contact and anti-reverse diode D
Even, relay K stationary contact is connected with thermistor.Relay K coil contact relay control terminal, the control terminal is by 12V electricity
Voltage-controlled system, if circuit is working properly, 12V voltages can be produced at relay K coil both ends by delay after start, then relay
Device K movable contact closure, electric current flow through from relay K；If input is reversed, no current in circuit, relay K coil
Both ends no-voltage, relay K movable contact will not close.Thermistor is in the anti-current surge of booting moment.
When the connection of DC supply input both positive and negative polarity is correct, electric current is successively through anti-reverse diode D, thermistor, load
Input negative pole is flowed back to, then relay K is closed, and electric current flows back to input negative pole through relay K, load.In normal work, counnter attack
Connect circuit not consumed energy.
When DC supply input both positive and negative polarity is reversed, due to anti-reverse diode D presence, electricity will not be produced in circuit
Stream, load will not also start, and reach the effect of protection circuit.
As described above, the plan content with reference to given by accompanying drawing, can derive similar technical scheme.In every case it is not de-
From the content of technical solutions of the utility model, above example is made according to the technical essence of the utility model any simple
Modification, equivalent variations and modification, in the range of still falling within technical solutions of the utility model.
Claims (5)
- A kind of 1. direct current reverse-connection preventing circuit, it is characterised in that：Including relay and anti-reverse diode, including relay and counnter attack Connect diode, the anti-reverse diode cathode connection power supply negative input end, negative pole connect the coil of the relay, it is described after The other end connection power supply positive input terminal of electric apparatus coil, the contact portion power supply negative output terminal or positive output end of the relay, Contact is normally-closed contact.
- A kind of 2. direct current reverse-connection preventing circuit according to claim 1, it is characterised in that：The common of the relay with The connection of power supply negative input end, normally-closed contact connection power supply negative output terminal, normally opened contact sky connect.
- A kind of 3. direct current reverse-connection preventing circuit according to claim 1, it is characterised in that：The common of the relay with The connection of power supply positive input terminal, normally-closed contact connection power supply positive output end, normally opened contact sky connect.
- A kind of 4. direct current reverse-connection preventing circuit according to claim 1, it is characterised in that：The anti-reverse diode is luminous Diode.
- A kind of 5. direct current reverse-connection preventing circuit according to claim 1, it is characterised in that：In the positive pole string of anti-reverse diode Join a current-limiting resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721129531.6U CN207218244U (en) | 2017-09-05 | 2017-09-05 | A kind of direct current reverse-connection preventing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721129531.6U CN207218244U (en) | 2017-09-05 | 2017-09-05 | A kind of direct current reverse-connection preventing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207218244U true CN207218244U (en) | 2018-04-10 |
Family
ID=61827080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721129531.6U Active CN207218244U (en) | 2017-09-05 | 2017-09-05 | A kind of direct current reverse-connection preventing circuit |
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| Country | Link |
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| CN (1) | CN207218244U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109301897A (en) * | 2018-10-18 | 2019-02-01 | 中国北方车辆研究所 | The anti-external power supply error-polarity connection of panzer simultaneously realizes the circuit controllably exported |
| CN110829405A (en) * | 2018-08-14 | 2020-02-21 | 维谛技术有限公司 | Reverse connection prevention protection circuit and communication power supply equipment |
| CN112881937A (en) * | 2021-01-27 | 2021-06-01 | 阳光电源股份有限公司 | Safety detection device and method for direct-current power supply system |
-
2017
- 2017-09-05 CN CN201721129531.6U patent/CN207218244U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110829405A (en) * | 2018-08-14 | 2020-02-21 | 维谛技术有限公司 | Reverse connection prevention protection circuit and communication power supply equipment |
| CN109301897A (en) * | 2018-10-18 | 2019-02-01 | 中国北方车辆研究所 | The anti-external power supply error-polarity connection of panzer simultaneously realizes the circuit controllably exported |
| CN109301897B (en) * | 2018-10-18 | 2022-04-26 | 中国北方车辆研究所 | Circuit for preventing polarity reversal connection of external power supply and realizing controllable output of armored vehicle |
| CN112881937A (en) * | 2021-01-27 | 2021-06-01 | 阳光电源股份有限公司 | Safety detection device and method for direct-current power supply system |
| CN112881937B (en) * | 2021-01-27 | 2022-07-12 | 阳光电源股份有限公司 | Safety detection device and method for direct-current power supply system |
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