CN202930934U - Protective circuit - Google Patents
Protective circuit Download PDFInfo
- Publication number
- CN202930934U CN202930934U CN 201220514856 CN201220514856U CN202930934U CN 202930934 U CN202930934 U CN 202930934U CN 201220514856 CN201220514856 CN 201220514856 CN 201220514856 U CN201220514856 U CN 201220514856U CN 202930934 U CN202930934 U CN 202930934U
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- protective circuit
- power
- line
- diode
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Abstract
The utility model discloses a protective circuit, comprising an input end, a first protective circuit and a second protective circuit. The input end comprises a first power line, a second power line, a first signal line and a second signal line, wherein the first and second power lines are connected with the first protective circuit, and the first protective circuit includes a first power output end and a second power output end; and the first and second signal lines are connected with the second protective circuit, the second protective circuit comprises an optical coupler, and the optical coupler includes a first signal output end and second power output end. The protective circuit comprises not only the first protective circuit connected with the first and second power lines, but also the second protective circuit connected with the first and second signal lines, wherein the second protective circuit comprises the optical coupler, the two power lines and the two signal lines can be connected in any manner and are not damaged, and different misconnection and reverse connection states can be effectively handled; and the protective circuit of the utility model is more comprehensive and reasonable in protection and possesses versatility.
Description
Technical field
The application relates to protection circuit.
Background technology
Protection circuit in prior art includes only anti-reverse measure usually, aspect the mistake proofing wiring, has generally done some the most basic protection with piezo-resistance, resettable fuse etc., can play certain protective effect, completely anti-misconnection.Aspect processing control signals, use two power lines and two holding wires very general.Switch device with on-off signal because wiring workload at the scene is many, the situation of wrong line unavoidably can occur, has received on a power line as one of two power lines, and another root power line has been received on holding wire.The electric current and voltage of protection also only is confined to selected piezo-resistance and resettable fuse, and the time of protection is short, in case overlong time is just probably burnt piezo-resistance or resettable fuse.
Summary of the invention
The technical problem that the application will solve is for the deficiencies in the prior art, and a kind of protection circuit is provided.
The technical problem that the application will solve is solved by the following technical programs:
A kind of protection circuit; comprise input, the first protective circuit, the second protective circuit; described input comprises the first power line, second source line, first signal line and secondary signal line; described the first power line be connected the second source line and be connected with described the first protective circuit; described the first protective circuit has the first power output end and second source output; described first signal line be connected the secondary signal line and be connected with described the second protective circuit; described the second protective circuit comprises optocoupler, and described optocoupler has first signal output and secondary signal output.
Described first signal line is connected with described the first power output end, and the anode of described optocoupler is connected with described secondary signal line, and the negative electrode of described optocoupler is connected with described second source output.
Described the second protective circuit also comprises the first resistance, and described first signal line is connected with described the first power output end by described the first resistance.
Described the second protective circuit also comprises the second resistance, and the negative electrode of described optocoupler is connected with described second source output by described the second resistance.
Described the first protective circuit comprises electric bridge.
Described electric bridge comprises the first diode, the second diode, the 3rd diode and the 4th diode, described the first diode is arranged between described the first power line and described the first power output end, described the second diode is arranged between described second source line and described the first power output end, described the 3rd diode is arranged between described the first power line and described second source output, and described the 4th diode is arranged between described second source line and described second source output.
Owing to having adopted above technical scheme, the beneficial effect that the application possesses is:
in the application's embodiment, owing to not only comprising the first protective circuit that is connected with the second source line with the first power line, also comprise the second protective circuit that is connected with the secondary signal line with the first signal line, the second protective circuit comprises optocoupler, two power lines and two holding wire wiring in any way, all can not damage, and be not subjected to time restriction, not affected by signal mode, as false wiring, system's cisco unity malfunction, and after correct wiring, normal operation recovers again in system, can successfully manage the situation of various misconnection and reverse power connection, the application's protection is reasonable more comprehensively, has versatility.
Description of drawings
Fig. 1 is the circuit diagram of a kind of embodiment of the application's protection circuit.
Embodiment
By reference to the accompanying drawings the application is described in further detail below by embodiment.
as shown in Figure 1, the application's protection circuit, its a kind of execution mode, comprise input, the first protective circuit and the second protective circuit, input comprises two power lines and two holding wires, be respectively the first power line POWER1, second source line POWER2, first signal line SINGLE1 and secondary signal line SINGLE2, the first power line POWER1 is connected with the first protective circuit with second source line POWER2, the first protective circuit has the first power output end P+ and second source output P-, first signal line SINGLE1 is connected with the second protective circuit with secondary signal line SINGLE2, the second protective circuit comprises optocoupler U1, optocoupler has first signal output S+ and secondary signal output S-.
In one embodiment, first signal line SINGLE1 is connected with the first power output end P+, and the anode of optocoupler U1 is connected with secondary signal line SINGLE2, and the negative electrode of optocoupler U1 is connected with second source output P-.
In one embodiment, the second protective circuit comprises that also the first resistance R 1, the first resistance R 1 is current-limiting resistance.First signal line SINGLE1 is connected with the first power output end P+ by the first resistance, and namely the first resistance R 1 one ends are connected with first signal line SINGLE1, and the other end is connected with the first power output end P+.The second protective circuit comprises that also the second resistance R 2, the second resistance R 2 are also current-limiting resistance.The negative electrode of optocoupler U1 is connected with the second source output by the second resistance R 2, and namely the second resistance R 2 one ends are connected with the negative electrode of optocoupler U 1, and the other end is connected with second source output P-.
In one embodiment, the first protective circuit comprises electric bridge.Electric bridge comprises four diodes, is respectively the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4.The first diode D1 is arranged between the first power line POWER1 and the first power output end P+, the second diode D2 is arranged between second source line POWER2 and the first power output end P+, the 3rd diode D3 is arranged between the first power line POWER1 and second source output P-, and the 4th diode D4 is arranged between described second source line POWER2 and second source output P-.
In this circuit, the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4 form electric bridge, and power supply is polarity not.First power output end P+ and the second source output P-of power supply after electric bridge can connect power-switching circuit again, accomplishes the isolation of plate level, is simultaneously optocoupler U1 power supply.Relay signal offers the post-processed circuit after optocoupler U1 isolation.the first resistance R 1 and the second resistance R 2 are the current limliting power resistor, enough current signals are provided when guaranteeing normal operation, during misconnection, two kinds of misconnection paths appear at most, one is that the first power line POWER1 or second source line POWER2 connect positive source, first signal line SINGLE1 connects power cathode, this moment, electric current was got back to power cathode through the first diode D1 or the second diode D2 to the first resistance R 1, another kind of misconnection path is that power cathode is connected with the first power line POWER1 or second source line POWER2, secondary signal line SINGLE2 is connected with positive source, this moment, electric current was got back to negative pole to the 3rd diode D3 or the 4th diode D4 through optocoupler U1 again to the second resistance R 2, set the resistance of current limliting the first resistance R 1 and the first resistance R 2, can avoid circuit to damage.
Above content is the further description of the application being done in conjunction with concrete execution mode, can not assert that the application's concrete enforcement is confined to these explanations.For the application person of an ordinary skill in the technical field, under the prerequisite that does not break away from the application's design, can also make some simple deduction or replace.
Claims (6)
1. protection circuit, it is characterized in that, comprise input, the first protective circuit, the second protective circuit, described input comprises the first power line, the second source line, first signal line and secondary signal line, described the first power line be connected the second source line and be connected with described the first protective circuit, described the first protective circuit has the first power output end and second source output, described first signal line be connected the secondary signal line and be connected with described the second protective circuit, described the second protective circuit comprises optocoupler, described optocoupler has first signal output and secondary signal output.
2. protection circuit as claimed in claim 1, is characterized in that, described first signal line is connected with described the first power output end, and the anode of described optocoupler is connected with described secondary signal line, and the negative electrode of described optocoupler is connected with described second source output.
3. protection circuit as claimed in claim 2, is characterized in that, described the second protective circuit also comprises the first resistance, and described first signal line is connected with described the first power output end by described the first resistance.
4. protection circuit as claimed in claim 3, is characterized in that, described the second protective circuit also comprises the second resistance, and the negative electrode of described optocoupler is connected with described second source output by described the second resistance.
5. protection circuit as described in any one in claim 2 to 4, is characterized in that, described the first protective circuit comprises electric bridge.
6. protection circuit as claimed in claim 5, it is characterized in that, described electric bridge comprises the first diode, the second diode, the 3rd diode and the 4th diode, described the first diode is arranged between described the first power line and described the first power output end, described the second diode is arranged between described second source line and described the first power output end, described the 3rd diode is arranged between described the first power line and described second source output, and described the 4th diode is arranged between described second source line and described second source output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220514856 CN202930934U (en) | 2012-09-29 | 2012-09-29 | Protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220514856 CN202930934U (en) | 2012-09-29 | 2012-09-29 | Protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202930934U true CN202930934U (en) | 2013-05-08 |
Family
ID=48220844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220514856 Expired - Fee Related CN202930934U (en) | 2012-09-29 | 2012-09-29 | Protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202930934U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104659603A (en) * | 2014-06-26 | 2015-05-27 | 柳州市够旺贸易有限公司 | Socket |
| CN105305400A (en) * | 2015-11-13 | 2016-02-03 | 成都秦川科技发展有限公司 | Reverse connection protection circuit of power supply of power utilization equipment |
-
2012
- 2012-09-29 CN CN 201220514856 patent/CN202930934U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104659603A (en) * | 2014-06-26 | 2015-05-27 | 柳州市够旺贸易有限公司 | Socket |
| CN105305400A (en) * | 2015-11-13 | 2016-02-03 | 成都秦川科技发展有限公司 | Reverse connection protection circuit of power supply of power utilization equipment |
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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: 20130508 Termination date: 20170929 |