CN201797506U - Anti-reverse limited current circuit for external input of optical coupler - Google Patents
Anti-reverse limited current circuit for external input of optical coupler Download PDFInfo
- Publication number
- CN201797506U CN201797506U CN2010202881133U CN201020288113U CN201797506U CN 201797506 U CN201797506 U CN 201797506U CN 2010202881133 U CN2010202881133 U CN 2010202881133U CN 201020288113 U CN201020288113 U CN 201020288113U CN 201797506 U CN201797506 U CN 201797506U
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- Prior art keywords
- optical coupler
- circuit
- optocoupler
- reverse
- limited current
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Abstract
The utility model discloses an anti-reverse limited current circuit for the external input of an optical coupler. The anti-reverse limited current circuit comprises an optical coupler connected between an external circuit and a control system; and the signal input end of the optical coupler is connected with an anti-reverse circuit and a limited current circuit in series. Through the structure that the input end of the optical coupler is connected with the anti-reverse circuit, the input polarity of the optical coupler is prevented from being broken by being connected with the reversed polarity of an external device, and the optical coupler is ensured not to be damaged when a logical mistake happens. On the basis of the anti-reverse circuit, the input end of the optical coupler is also connected with the limited current circuit in series, the light emitting diode of the optical coupler is prevented from being burnt out due to the large current caused by the overhigh voltage, and the combination of the optical coupler, the anti-reverse circuit and the limited current circuit provides effective protection for system interfaces.
Description
Technical field
The utility model belongs to the circuit design technique field, relates in particular to the outside input of a kind of optocoupler counnter attack current-limiting circuit.
Background technology
In high voltage system, electric machine control system, the normal stronger optocoupler of antijamming capability that adopts carries out Signal Separation, pure and the safety of the power supply of assurance system, yet under many circumstances, the user also needs differential input signal or universal high-low level to trigger logic, but, be easy to burn out the input logic interface because terminal block mistake or control system fault will cause situations such as overtension or level be reverse to take place.Therefore, be necessary for said system a kind of safe and effective safeguard measure is provided.
Summary of the invention
Problem to be solved in the utility model just provides the outside input of a kind of optocoupler counnter attack current-limiting circuit, has simple in structure, wiring flexible characteristic, can provide effective protection for system interface, improves the stability of a system.
For solving the problems of the technologies described above, the utility model adopts following technical scheme: the outside input of a kind of optocoupler counnter attack current-limiting circuit, comprise the optocoupler that is connected between external circuit and control system, it is characterized in that: be in series with anti-circnit NOT on the signal input part of described optocoupler.
Further, described anti-circnit NOT is made of the counnter attack diode.
Further, also be in series with current-limiting circuit on the signal input part of described optocoupler.
Further, described current-limiting circuit is the resistor network that is made of several current-limiting resistances.
The beneficial effects of the utility model: optocoupler is to be an a kind of electric light one power conversion device of the media transmission signal of telecommunication with light, form by light emitting source and light-receiving device two parts, the pin of light emitting source is input, the pin of light-receiving device is an output, light emitting source is generally light-emitting diode, light-receiving device is generally photodiode or phototriode, the utility model is core with the optocoupler, by the anti-circnit NOT of its input series connection, prevent that the optocoupler input stage that the logic reversal connection causes from puncturing, and guarantees that optocoupler is not damaged when logic error; The current-limiting circuit of connecting again on the counnter attack circuit base prevents that big electric current that overtension causes from burning out the light-emitting diode of optocoupler, and optocoupler, anti-circnit NOT, current-limiting circuit three's the system interface that is combined into provides effective protection.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further described:
Fig. 1 is a schematic block circuit diagram of the present utility model;
Fig. 2 is the utility model circuit element connection diagram.
Embodiment
As shown in Figure 1 and Figure 2, the utility model is the outside input of an a kind of optocoupler counnter attack current-limiting circuit, comprises the optocoupler 3 that is connected between external circuit 1 and control system, is in series with anti-circnit NOT 2, anti-circnit NOT 4 on the signal input part of described optocoupler 3; Anti-circnit NOT 2 is made of the counnter attack diode, and anti-circnit NOT 4 is the resistor networks that are made of several current-limiting resistances.Should consider its withstand voltage ceiling voltage for occurring in the control system when counnter attack diode is chosen, its electric current is not less than the maximum current of optocoupler 3 light-emitting diodes; And the input current of current-limiting resistance maximum can be appearred in logic level the time is limited in the maximum current that optocoupler 3 inputs can be born.As shown in Figure 2; R1 is that current-limiting resistance, D1 are the counnter attack diode; D2 is the light-emitting diode of optocoupler 3; it is light emitting source; circuit diagram shown in Figure 2 is a kind of embodiment that the utility model circuit connects, and protection range of the present utility model is not construed as limiting, and those skilled in the art can make various changes and distortion according to schematic diagram shown in the utility model Fig. 1; only otherwise break away from spirit of the present utility model, all should belong to the defined scope of the utility model claims.
Claims (4)
1. the outside input of an optocoupler counnter attack current-limiting circuit comprises the optocoupler (3) that is connected between external circuit (1) and control system, it is characterized in that: be in series with anti-circnit NOT (2) on the signal input part of described optocoupler (3).
2. the outside input of a kind of optocoupler according to claim 1 counnter attack current-limiting circuit, it is characterized in that: described anti-circnit NOT (2) is made of the counnter attack diode.
3. the outside input of a kind of optocoupler according to claim 1 and 2 counnter attack current-limiting circuit is characterized in that: also be in series with current-limiting circuit (4) on the signal input part of described optocoupler (3).
4. the outside input of a kind of optocoupler according to claim 3 counnter attack current-limiting circuit, it is characterized in that: described current-limiting circuit (4) is the resistor network that is made of several current-limiting resistances.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202881133U CN201797506U (en) | 2010-08-06 | 2010-08-06 | Anti-reverse limited current circuit for external input of optical coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202881133U CN201797506U (en) | 2010-08-06 | 2010-08-06 | Anti-reverse limited current circuit for external input of optical coupler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201797506U true CN201797506U (en) | 2011-04-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202881133U Expired - Fee Related CN201797506U (en) | 2010-08-06 | 2010-08-06 | Anti-reverse limited current circuit for external input of optical coupler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201797506U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101989856A (en) * | 2010-08-06 | 2011-03-23 | 许晓华 | Reverse connection prevention current-limiting circuit with externally input optical coupler |
| CN103063972A (en) * | 2012-12-20 | 2013-04-24 | 江苏宏宝电子有限公司 | Photovoltaic grid-connected inverter direct current reverse-connection prevention detection system |
-
2010
- 2010-08-06 CN CN2010202881133U patent/CN201797506U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101989856A (en) * | 2010-08-06 | 2011-03-23 | 许晓华 | Reverse connection prevention current-limiting circuit with externally input optical coupler |
| CN103063972A (en) * | 2012-12-20 | 2013-04-24 | 江苏宏宝电子有限公司 | Photovoltaic grid-connected inverter direct current reverse-connection prevention detection system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ZHEJIANG LINIX MOTOR CO., LTD. Free format text: FORMER OWNER: XU XIAOHUA Effective date: 20121228 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 322100 JINHUA, ZHEJIANG PROVINCE TO: 322118 JINHUA, ZHEJIANG PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20121228 Address after: 196 No. 322118 Zhejiang city of Dongyang province Hengdian Electronic Industrial Park Industrial Avenue Patentee after: Zhejiang Linix Motor Co., Ltd. Address before: 196 No. 322100 Zhejiang city of Dongyang province Hengdian Electronic Industrial Park Industrial Avenue Patentee before: Xu Xiaohua |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110413 Termination date: 20140806 |
|
| EXPY | Termination of patent right or utility model |