CN101989856A - Reverse connection prevention current-limiting circuit with externally input optical coupler - Google Patents
Reverse connection prevention current-limiting circuit with externally input optical coupler Download PDFInfo
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- CN101989856A CN101989856A CN 201010250500 CN201010250500A CN101989856A CN 101989856 A CN101989856 A CN 101989856A CN 201010250500 CN201010250500 CN 201010250500 CN 201010250500 A CN201010250500 A CN 201010250500A CN 101989856 A CN101989856 A CN 101989856A
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- current
- optical coupler
- limiting circuit
- reverse connection
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Abstract
The invention discloses a reverse connection prevention current-limiting circuit with an externally input optical coupler, which comprises the optical coupler connected between an external circuit and a control system. A signal input end of the optical coupler is connected in series with a reverse connection prevention circuit and a current-limiting circuit. The input end of the optical coupler is connected in series with the reverse connection prevention circuit so as to prevent input stage breakdown of the optical coupler, which is caused by logic reverse connection and guarantee that the optical coupler is not damaged in case of a logic error; and the current-limiting circuit is also connected in series with the reverse connection prevention circuit so as to prevent large current caused by excessively high voltage from burning down a light-emitting diode of the optical coupler. The combination of the optical coupler, the reverse connection prevention circuit and the current-limiting circuit provides effective protection for a system interface.
Description
Technical field
The invention belongs to the circuit design technique field, relate 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 by this invention 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 present invention 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, and 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.
Beneficial effect of the present invention: 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 present invention 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
The present invention is further illustrated below in conjunction with accompanying drawing:
Fig. 1 is a schematic block circuit diagram of the present invention;
Fig. 2 is a circuit element connection diagram of the present invention.
Embodiment
As shown in Figure 1 and Figure 2, the present invention 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 circuit of the present invention connects, and protection scope of the present invention is not construed as limiting, and those skilled in the art can make various changes and distortion by schematic diagram shown in Fig. 1 according to the present invention; only otherwise break away from spirit of the present invention, all should belong to the defined scope of claims of the present invention.
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 |
|---|---|---|---|
| CN 201010250500 CN101989856A (en) | 2010-08-06 | 2010-08-06 | Reverse connection prevention current-limiting circuit with externally input optical coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010250500 CN101989856A (en) | 2010-08-06 | 2010-08-06 | Reverse connection prevention current-limiting circuit with externally input optical coupler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101989856A true CN101989856A (en) | 2011-03-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010250500 Pending CN101989856A (en) | 2010-08-06 | 2010-08-06 | Reverse connection prevention current-limiting circuit with externally input optical coupler |
Country Status (1)
| Country | Link |
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| CN (1) | CN101989856A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2543259Y (en) * | 2002-04-18 | 2003-04-02 | 深圳键桥通讯技术有限公司 | Output short-circuit intelligent protection |
| CN201294490Y (en) * | 2008-11-19 | 2009-08-19 | 成都飞机工业集团电子科技有限公司 | Device for collecting and processing photoelectric coupling signal |
| CN101520472A (en) * | 2009-04-09 | 2009-09-02 | 中国兵器工业集团第七○研究所 | Battery jar voltage insulation test circuit based on linear optical coupler |
| CN201797506U (en) * | 2010-08-06 | 2011-04-13 | 许晓华 | Anti-reverse limited current circuit for external input of optical coupler |
-
2010
- 2010-08-06 CN CN 201010250500 patent/CN101989856A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2543259Y (en) * | 2002-04-18 | 2003-04-02 | 深圳键桥通讯技术有限公司 | Output short-circuit intelligent protection |
| CN201294490Y (en) * | 2008-11-19 | 2009-08-19 | 成都飞机工业集团电子科技有限公司 | Device for collecting and processing photoelectric coupling signal |
| CN101520472A (en) * | 2009-04-09 | 2009-09-02 | 中国兵器工业集团第七○研究所 | Battery jar voltage insulation test circuit based on linear optical coupler |
| CN201797506U (en) * | 2010-08-06 | 2011-04-13 | 许晓华 | Anti-reverse limited current circuit for external input of optical coupler |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110323 |