CN203826955U - Reverse-connection prevention circuit of DC power supply - Google Patents
Reverse-connection prevention circuit of DC power supply Download PDFInfo
- Publication number
- CN203826955U CN203826955U CN201420194407.8U CN201420194407U CN203826955U CN 203826955 U CN203826955 U CN 203826955U CN 201420194407 U CN201420194407 U CN 201420194407U CN 203826955 U CN203826955 U CN 203826955U
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- CN
- China
- Prior art keywords
- power supply
- photoelectrical coupler
- reverse
- photoelectric coupler
- resistor
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a reverse-connection prevention circuit of a DC power supply. The reverse-connection prevention circuit comprises a first photoelectric coupler G1, a second photoelectric coupler G2, a first resistor R1 and a second resistor R2; one end of the first resistor R1 is connected with an anode of a light-emitting device of the first photoelectric coupler G1, the other end of the first resistor R1 is connected with a collecting electrode of a light-receiving device of the first photoelectric coupler G1 and a cathode of a light-emitting device of the second photoelectric coupler G2, and the other end of the first resistor R1 is vacant to be connected with the DC power supply; one end of the second resistor R2 is connected with an anode of the light-emitting device of the second photoelectric coupler G2, the other end of the second resistor R2 is connected with a collecting electrode of a light-receiving device of the second photoelectric coupler G2 and a cathode of the light-emitting device of the first photoelectric coupler G1, and the other end of the second resistor R2 is vacant to be connected with the DC power supply; and an emitting electrode of the light-receiving device of the first photoelectric coupler G1 and an emitting electrode of the light-receiving device of the second photoelectric coupler G2 are connected to output the DC power supply. The reverse-connection prevention circuit can prevent power receiving equipment from damage caused by a reverse connection of the DC power supply, and the circuit structure is simple.
Description
Technical field
The utility model belongs to electronic circuit field, relates in particular to a kind of anti-reverse connection circuit of direct current power supply.
Background technology
DC power supply has dividing of both positive and negative polarity; therefore when utilizing DC power supply to power receiving equipment or circuit supply; want the both positive and negative polarity of caution area independent power source; otherwise may cause the damage of power receiving equipment or circuit; therefore; the utility model, for protection power receiving equipment, prevents that DC power supply from connecing anti-significant.
Summary of the invention
The purpose of this utility model is to prevent that the reversal connection of DC power supply both positive and negative polarity from causing the damage of power receiving equipment or circuit.
The utility model adopts following technical scheme:
An anti-reverse connection circuit of direct current power supply, comprises the first photoelectrical coupler G1, the second photoelectrical coupler G2, the first resistance R 1 and the second resistance R 2; One end of the first resistance R 1 is connected with the positive pole of the luminescent device of the first photoelectrical coupler G1, the other end is connected with the collector electrode of the optical receiving set part of the first photoelectrical coupler G1 and the negative pole of the luminescent device of the second photoelectrical coupler G2 and is vacant, for connecting DC power supply; One end of the second resistance R 2 is connected with the positive pole of the luminescent device of the second photoelectrical coupler G2, the other end is connected with the collector electrode of the optical receiving set part of the second photoelectrical coupler G2 and the negative pole of the luminescent device of the first photoelectrical coupler G1 and is vacant, for connecting DC power supply; The emitter of the optical receiving set part of the emitter of the optical receiving set part of the first photoelectrical coupler G1 and the second photoelectrical coupler G2 is connected to form DC power output end, output DC power supply.
Described DC power supply voltage will be lower than 24V.
The beneficial effects of the utility model:
1, use components and parts few, do not affect former DC power supply, can not bring supply voltage to reduce.
2, there is the features such as simple in structure, good practical effect.
Accompanying drawing explanation
Fig. 1 is the principle schematic of a kind of embodiment of the utility model;
Fig. 2 is the circuit theory diagrams of a kind of embodiment of the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.
Photoelectrical coupler of the present utility model can adopt TLP521-1, TLP521-2 or TLP521-4, and the first resistance R 1 equates with the resistance of the second resistance R 2.
As shown in Figure 1, a kind of embodiment of the present utility model comprises DC power supply access module, anti-reverse connection circuit of direct current power supply and DC power supply output module, the output of DC power supply access module is connected with the input of anti-reverse connection circuit of direct current power supply based on photoelectrical coupler, and the output of the anti-reverse connection circuit of direct current power supply based on photoelectrical coupler is connected with the input of DC power supply output module.
As shown in Figure 2, described anti-reverse connection circuit of direct current power supply, comprises the first photoelectrical coupler G1, the second photoelectrical coupler G2, the first resistance R 1 and the second resistance R 2; One end of the first resistance R 1 is connected with the positive pole 4 of the luminescent device of the first photoelectrical coupler G1, the other end is connected with the collector electrode 7 of the optical receiving set part of the first photoelectrical coupler G1 and the negative pole 9 of the luminescent device of the second photoelectrical coupler G2 and forms the first vacant end 1, for connecting DC power supply; One end of the second resistance R 2 is connected with the positive pole 8 of the luminescent device of the second photoelectrical coupler G2, the other end is connected with the collector electrode 11 of the optical receiving set part of the second photoelectrical coupler G2 and the negative pole 5 of the luminescent device of the first photoelectrical coupler G1 and forms the second vacant end 2, for connecting DC power supply; The emitter 10 of the optical receiving set part of the emitter 6 of the optical receiving set part of the first photoelectrical coupler G1 and the second photoelectrical coupler G2 is connected to form DC power output end 3, output DC power supply.
As shown in Figure 2, according to the electric characteristic of photoelectrical coupler, when DC power anode end is connected with the first vacant end 1 of reverse-connection preventing circuit, negative pole end is connected with the second vacant end 2 of reverse-connection preventing circuit, the equal conducting of pin 4,5,6,7 of the first photoelectrical coupler G1, the second photoelectrical coupler G2 is in cut-off state, and the output of DC power output end 3 is anodal DC power supply; Otherwise, when DC power cathode end is connected with the first vacant end 1 of reverse-connection preventing circuit, when positive terminal is connected with the second vacant end 2 of reverse-connection preventing circuit, the first photoelectrical coupler G1 is in cut-off state, the equal conducting of pin 8,9,10,11 of the second photoelectrical coupler G2, the output of DC power output end 3 is still anodal DC power supply.Therefore access howsoever, can guarantee output cathode DC power supply by the utility model circuit, thereby plays the anti-minus effect that connects.
The utility model is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (2)
1. an anti-reverse connection circuit of direct current power supply, is characterized in that: comprise the first photoelectrical coupler G1, the second photoelectrical coupler G2, the first resistance R 1 and the second resistance R 2; One end of the first resistance R 1 is connected with the positive pole of the luminescent device of the first photoelectrical coupler G1, the other end is connected with the collector electrode of the optical receiving set part of the first photoelectrical coupler G1 and the negative pole of the luminescent device of the second photoelectrical coupler G2 and is vacant, for connecting DC power supply; One end of the second resistance R 2 is connected with the positive pole of the luminescent device of the second photoelectrical coupler G2, the other end is connected with the collector electrode of the optical receiving set part of the second photoelectrical coupler G2 and the negative pole of the luminescent device of the first photoelectrical coupler G1 and is vacant, for connecting DC power supply; The emitter of the optical receiving set part of the emitter of the optical receiving set part of the first photoelectrical coupler G1 and the second photoelectrical coupler G2 is connected to form DC power output end, output DC power supply.
2. a kind of anti-reverse connection circuit of direct current power supply according to claim 1, is characterized in that: DC power supply voltage will be lower than 24V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420194407.8U CN203826955U (en) | 2014-04-22 | 2014-04-22 | Reverse-connection prevention circuit of DC power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420194407.8U CN203826955U (en) | 2014-04-22 | 2014-04-22 | Reverse-connection prevention circuit of DC power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203826955U true CN203826955U (en) | 2014-09-10 |
Family
ID=51482418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420194407.8U Expired - Fee Related CN203826955U (en) | 2014-04-22 | 2014-04-22 | Reverse-connection prevention circuit of DC power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203826955U (en) |
-
2014
- 2014-04-22 CN CN201420194407.8U patent/CN203826955U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140910 Termination date: 20210422 |