CN203632643U - Photoelectric isolation input and output circuit - Google Patents
Photoelectric isolation input and output circuit Download PDFInfo
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- CN203632643U CN203632643U CN201420006798.6U CN201420006798U CN203632643U CN 203632643 U CN203632643 U CN 203632643U CN 201420006798 U CN201420006798 U CN 201420006798U CN 203632643 U CN203632643 U CN 203632643U
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Abstract
The utility model relates to a photoelectric isolation input and output circuit. The photoelectric isolation input and output circuit is aimed to solve the problems of complex circuit and high cost of an existing input and output isolation circuit. The photoelectric isolation input and output circuit comprises a first photoelectric coupling isolator, a second photoelectric coupling isolator, a first resistor, a second resistor, a first diode, a second diode, a third diode, a fourth diode, a capacitor, a light emitting diode and a buffer gate integrated circuit. A power supply positive electrode of a control device I/O interface is connected with the collector electrode output end of the second photoelectric coupling isolator. A positive electrode of an external DC24V power supply is connected with the collector electrode output end of the first photoelectric coupling isolator. The I/O end of the control device I/O interface is connected with the input end of the buffer gate integrated circuit. An I/O end of a controlled object is connected with the input end of the second photoelectric coupling isolator. The photoelectric isolation input and output circuit is suitable for a photoelectric isolation input and output device.
Description
Technical field
The utility model relates to photoelectricity Isolation input output device.
Background technology
For the electronic control system of modern times various industrial circles application, all will be connected by control object.Namely carry out the I/O transmission of signal with control object.In order to meet anti-interference requirement, need to adopt necessary buffer circuit simultaneously.There is circuit complexity, problem that cost is high in current input and output buffer circuit.
Utility model content
The purpose of this utility model is to have circuit complexity, problem that cost is high in order to solve existing input and output buffer circuit, and a kind of photoelectricity Isolation input output circuit is provided.
A kind of photoelectricity Isolation input output circuit, it comprises photoelectric coupling isolator No. one, No. two photoelectric coupling isolators, a resistance, No. two resistance, a diode, No. two diodes, No. three diodes, No. four diodes, electric capacity, light-emitting diode and buffered gate integrated circuit, the positive source of control appliance I/O interface is communicated with the collector output of No. two photoelectric coupling isolators, the positive pole of outside DC24V power supply is communicated with the collector output of a photoelectric coupling isolator, the I/O end while of control appliance I/O interface and the input of buffered gate integrated circuit, the negative electrode of No. four diodes is communicated with, the output of buffered gate integrated circuit is communicated with an input of a photoelectric coupling isolator, another input of a photoelectric coupling isolator is communicated with one end of a resistance, the other end of a resistance is communicated with the circuit ground of control appliance I/O interface, the anode of No. four diodes is communicated with the emitter output of No. two photoelectric coupling isolators, by the I/O of control object end while one end with electric capacity, the negative electrode of No. three diodes, an input of No. two photoelectric coupling isolators is communicated with, another input while of No. two photoelectric coupling isolators and the anode of No. three diodes, the anode of light-emitting diode, the emitter output of a photoelectric coupling isolator is communicated with, and the negative electrode of light-emitting diode is communicated with one end of No. two resistance, the other end while of No. two resistance and the other end of electric capacity, by the circuit of control object be communicated with.
The utility model is by the photoelectric coupling isolator using photoelectric coupling isolator as output signal, and a resistance closes the current-limiting resistance of diode in isolator as output photoelectric lotus root; Photoelectric coupling isolator using No. two photoelectric coupling isolators as input signal, No. two resistance are as the current-limiting resistance of inputting diode in photoelectric coupling isolator, thereby realize control system and by the two-way I/O interface circuit of the photoelectric-isolated between control object, reached the photoelectricity isolation of I/O transmission.
The utlity model has the feature that circuit is simple, reliability is high, anti-interference is high, cost is low.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model, and Fig. 2 is that signal of the present utility model moves towards schematic diagram, and in figure, dotted line is the current trend of input signal, and solid line is the current trend of output signal.
Embodiment
Embodiment one: present embodiment is described in conjunction with Fig. 1 and Fig. 2, a kind of photoelectricity Isolation input output circuit described in present embodiment, it comprises photoelectric coupling isolator GD1 No. one, No. two photoelectric coupling isolator GD2, a resistance R 1, No. two resistance R 2, a diode V1, No. two diode V2, No. three diode V3, No. four diode V4, capacitor C, light-emitting diode H1 and buffered gate integrated circuit (IC), the positive source of control appliance I/O interface is communicated with the collector output of No. two photoelectric coupling isolator GD2, the positive pole of outside DC24V power supply is communicated with the collector output of a photoelectric coupling isolator GD1, the I/O end while of control appliance I/O interface and the input of buffered gate integrated circuit (IC), the negative electrode of No. four diode V4 is communicated with, the output of buffered gate integrated circuit (IC) is communicated with an input of a photoelectric coupling isolator GD1, another input of a photoelectric coupling isolator GD1 is communicated with one end of a resistance R 1, the other end of a resistance R 1 is communicated with the circuit ground of control appliance I/O interface, the anode of No. four diode V4 is communicated with the emitter output of No. two photoelectric coupling isolator GD2, by the I/O of control object end while one end with capacitor C, the negative electrode of No. three diode V3, an input of No. two photoelectric coupling isolator GD2 is communicated with, another input while of No. two photoelectric coupling isolator GD2 and the anode of No. three diode V3, the anode of light-emitting diode H1, the emitter output of a photoelectric coupling isolator GD1 is communicated with, the negative electrode of light-emitting diode H1 is communicated with one end of No. two resistance R 2, the other end while of No. two resistance R 2 and the other end of capacitor C, by the circuit of control object be communicated with.
The utility model is by the photoelectric coupling isolator using photoelectric coupling isolator GD1 as output signal, and a resistance R 1 is closed the current-limiting resistance of diode in isolator as output photoelectric lotus root, current limit in 7mA left and right; Photoelectric coupling isolator using No. two photoelectric coupling isolator GD2 as input signal, No. two resistance R 2 are as the current-limiting resistance of diode in input photoelectric coupling isolators, current limit in 7mA left and right.Thereby realize control system and by the two-way I/O interface circuit of the photoelectric-isolated between control object, reached the photoelectricity isolation of I/O transmission.
Light-emitting diode H1 is output or inputs shared indication light diode.
A diode V1 and No. two diode V2 are pressure drop diode, the DC24V voltage of input is reduced to 22.5V and close isolator GD1 for output photoelectric lotus root, guarantee when I/O interface is during as input the reliable conducting of diode in input photoelectric coupling isolator GD2.No. three diode V3 are output diode, and 22V voltage is sent to output, play simultaneously the 24V of input is played to buffer action.
The input voltage DC24V of interface circuit, output voltage 22V, interface maximum load current 50mA (depending on photoelectricity lotus root GD1 output current).Interface circuit input isolation Side controls voltage DC12V.
Certainly make electric current by photodiode in a photoelectric coupling isolator GD1 at 7mA by the value of adjusting resistance R1, also can meet is other needs of controlling voltage, as 5V etc.Make it have better applicability.
Embodiment two: present embodiment is described in conjunction with Fig. 2, present embodiment is the further restriction to a kind of photoelectricity Isolation input output circuit described in embodiment one, and a photoelectric coupling isolator GD1 and No. two photoelectric coupling isolator GD2 all adopt TLP521-4.
Claims (2)
1. a photoelectricity Isolation input output circuit, it is characterized in that, it comprises a photoelectric coupling isolator (GD1), No. two photoelectric coupling isolators (GD2), a resistance (R1), No. two resistance (R2), a diode (V1), No. two diodes (V2), No. three diodes (V3), No. four diodes (V4), electric capacity (C), light-emitting diode (H1) and buffered gate integrated circuit (IC), the positive source of control appliance I/O interface is communicated with the collector output of No. two photoelectric coupling isolators (GD2), the positive pole of outside DC24V power supply is communicated with the collector output of a photoelectric coupling isolator (GD1), the I/O end while of control appliance I/O interface and the input of buffered gate integrated circuit (IC), the negative electrode of No. four diodes (V4) is communicated with, the output of buffered gate integrated circuit (IC) is communicated with an input of a photoelectric coupling isolator (GD1), another input of a photoelectric coupling isolator (GD1) is communicated with one end of a resistance (R1), the other end of a resistance (R1) is communicated with the circuit ground of control appliance I/O interface, the anode of No. four diodes (V4) is communicated with the emitter output of No. two photoelectric coupling isolators (GD2), by the I/O of control object end while one end with electric capacity (C), the negative electrode of No. three diodes (V3), an input of No. two photoelectric coupling isolators (GD2) is communicated with, another input while of No. two photoelectric coupling isolators (GD2) and the anode of No. three diodes (V3), the anode of light-emitting diode (H1), the emitter output of a photoelectric coupling isolator (GD1) is communicated with, the negative electrode of light-emitting diode (H1) is communicated with one end of No. two resistance (R2), the other end while of No. two resistance (R2) and the other end of electric capacity (C), by the circuit of control object be communicated with.
2. a kind of photoelectricity Isolation input output circuit according to claim 1, is characterized in that, a photoelectric coupling isolator (GD1) and No. two photoelectric coupling isolators (GD2) all adopt TLP521-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420006798.6U CN203632643U (en) | 2014-01-03 | 2014-01-03 | Photoelectric isolation input and output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420006798.6U CN203632643U (en) | 2014-01-03 | 2014-01-03 | Photoelectric isolation input and output circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203632643U true CN203632643U (en) | 2014-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420006798.6U Expired - Fee Related CN203632643U (en) | 2014-01-03 | 2014-01-03 | Photoelectric isolation input and output circuit |
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| CN (1) | CN203632643U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301397A (en) * | 2015-11-03 | 2016-02-03 | 中国南方电网有限责任公司超高压输电公司南宁局 | Simulation breaker with fault simulation function and simulation method |
-
2014
- 2014-01-03 CN CN201420006798.6U patent/CN203632643U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301397A (en) * | 2015-11-03 | 2016-02-03 | 中国南方电网有限责任公司超高压输电公司南宁局 | Simulation breaker with fault simulation function and simulation method |
| CN105301397B (en) * | 2015-11-03 | 2018-05-11 | 中国南方电网有限责任公司超高压输电公司南宁局 | A kind of mimic-disconnecting switch and its analogy method of tape jam analog functuion |
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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 |
Granted publication date: 20140604 Termination date: 20150103 |
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| EXPY | Termination of patent right or utility model |