CN203350664U - Output control circuit - Google Patents
Output control circuit Download PDFInfo
- Publication number
- CN203350664U CN203350664U CN 201320418565 CN201320418565U CN203350664U CN 203350664 U CN203350664 U CN 203350664U CN 201320418565 CN201320418565 CN 201320418565 CN 201320418565 U CN201320418565 U CN 201320418565U CN 203350664 U CN203350664 U CN 203350664U
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- China
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- microcontroller
- output
- photoelectrical coupler
- relay
- control circuit
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Abstract
Disclosed is an output control circuit. One of two output interfaces of a microcontroller is connected to a cathode of a light-emitting diode of a photoelectric coupler. The other output interface of the microcontroller is connected to the anode of the light-emitting diode of the photoelectric coupler via a current limiting resistor. The photoelectric coupler and a high-power triode are connected together. The high-power triode is connected to an output relay for driving an external circuit. The highly reliable output control circuit provided by the utility model changes the control method of the microcontroller through the photoelectric coupler now widely used to achieve the purpose of improving reliability. The output control circuit is used in microcontroller-based automatic control equipment and can improve the reliability by four times compared with a conventional circuit.
Description
Technical field
The utility model relates to a kind of high reliability output control circuit, belongs to the automatic control technology field, especially for the output interface of microcontroller.
Background technology
In the automatic control system based on microcontroller implementation, usually use level " height ", " low " of a certain output interface of microcontroller to control switching on and off of external circuit.In use for improving carrying load ability and antijamming capability, general with photoelectrical coupler and power amplification circuit driving relay, contactor or noncontacting switch control external circuit, as high power motor, on-load switch etc., to realize the computer control in the fields such as commercial production, change distribution.Because " height ", " low " of output interface level has microcontroller to carry out corresponding instruction, realize, and binary coded representation is all used in instruction, fully as broad as long from formal and general data.The rear program " race flies " if microcontroller is interfered and mistake is carried out some data and combination thereof as instruction, just likely produce wrong switch.Although adopt photoelectrical coupler can isolate most of the interference, guarantee the reliability of system works, only utilize photoelectrical coupler can not avoid the misoperation produced because of interference fully.And the consequence that misoperation causes under some specific occasions is very serious, therefore must adopt an effective measure and further improve the reliability of system works, reduce the probability that causes misoperation because of interference.
Summary of the invention
For overcoming the deficiency of available circuit working method, goal of the invention of the present utility model is to provide a kind of output control circuit of high reliability, by now widely used photoelectrical coupler, change the control method of microcontroller, realize improving the purpose of its reliability.
For achieving the above object, the technical solution of the utility model is: one of two output interfaces of microcontroller are connected with the light emitting diode negative pole of photoelectrical coupler, and another output interface of microcontroller is connected with the light emitting diode of photoelectrical coupler is anodal through current-limiting resistor; Photoelectrical coupler is connected with large power triode; Large power triode is connected with the output relay for driving external circuit.
Described microcontroller is single-chip microcomputer or Programmadle logic device or SOC chip.
Described relay is mechanical relay or solid-state relay.
Described current-limiting resistor is general resistor.
Described photoelectrical coupler is any photoelectrical coupler chip, and the triode of photoelectrical coupler drives outside large power triode.
Outside large power triode is connected with relay, and relay is for driving external circuit.
Two output interfaces of microcontroller are connected with " just ", " bearing " utmost point of photoelectrical coupler light emitting diode respectively, it is core of the present utility model, only have in these two output interfaces and be output as high level with anodal connection of photoelectrical coupler light emitting diode, and the light emitting diode that is connected photoelectrical coupler while being output as low level with photoelectrical coupler light emitting diode negative pole is just understood conducting, the power amplification circuit be connected with photoelectrical coupler produces output, makes relay, contactor adhesive.Because the high and low arrangement of two output interface level has 4 kinds of combinations---" high ", " just ", " low high ", " low ", only have a kind of combination wherein just to meet above-mentioned condition, make power amplification circuit produce output, therefore for traditional circuit only has a kind of output combination, the utility model circuit because disturbs and the possibility that produces misoperation is only 1/4th of traditional circuit under the same conditions, and reliability rises to four times of former traditional circuit.
The accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Fig. 1 is circuit structure block schematic of the present utility model.
Fig. 2 is circuit diagram of the present utility model.
Embodiment
In Fig. 1, one of two output pins of microcontroller 1 are connected with current-limiting resistor 2, another output pin is connected with the light emitting diode negative pole of photoelectrical coupler 3, the other end of current-limiting resistor 2 is connected with photoelectrical coupler 3 light emitting diodes are anodal, photoelectrical coupler 3 is connected with large power triode 4, and output relay 5 is connected with large power triode 4.
Two output interfaces of microcontroller 1 are connected with " negative pole " with " positive pole " of photoelectrical coupler 3 light emitting diodes respectively, and the triode of photoelectrical coupler 3 drives large power triode 4 again, and large power triode 4 drives relay 5.For guaranteeing photoelectrical coupler 3 and microcontroller 1 output interface normal operation, between the light emitting diode of the output interface of microcontroller 1 and photoelectrical coupler 3, be connected with current-limiting resistor 2.At work, if need to make external circuit connects, microcontroller 1 should be carried out the output interface output high level that instruction makes respectively and the light emitting diode of photoelectrical coupler 3 positive pole is connected, and makes the output interface output low level be connected with the light emitting diode negative pole of photoelectrical coupler 3; When the needs external circuit disconnects, microcontroller 1 should be carried out instruction and make respectively and the anodal output interface output low level be connected of the light emitting diode of photoelectrical coupler 3, and makes the output interface output high level be connected with the light emitting diode negative pole of photoelectrical coupler 3.Whether the triode of photoelectrical coupler 3 controls large power triode 4 according to the conducting of its light emitting diode, and the further action of pilot relay 5, contactor etc., completes the control function.
In Fig. 2, it is the STC89C51 single-chip microcomputer that microcontroller 1 adopts model, this is a kind of single-chip microcomputer of 8 bit strip switching value input/output interfaces, effectively simplied system structure, reduce costs, can adopt any microcontroller or microprocessor in concrete enforcement, the P1.0 of microcontroller 1 is connected with current-limiting resistor 2, and the other end of current-limiting resistor 2 is connected with the positive pole of photoelectrical coupler 2 light emitting diodes, and the P1.1 of microcontroller 1 is connected with the negative pole of photoelectrical coupler 3 light emitting diodes; Photoelectrical coupler 3 adopts TP521, also can use other model, and the kind of current-limiting resistor 2 and resistance can be selected according to concrete element, and its major function is the output pin that the restriction super-high-current flows through microcontroller, impaired to avoid it.The emitter of photoelectrical coupler 3 triodes is connected with the base stage of large power triode 4, the collector of photoelectrical coupler 3 triodes is connected with the collector of large power triode 4, large power triode 4 adopts 9013 here, also can use other model, its major function is to carry out power amplification, to drive relay 5, coil one end of relay 5 is connected with the collector of large power triode 4, the other end of relay 5 coils is connected with positive source, relay 5 can adopt dimension as required, also can use solid-state relay, the output contact of relay 5 is for controlling external circuit.Make relay 5 closings of contact as need during work, need microcontroller 1 to carry out instruction P1.0 is exported to high level, make the P1.1 output low level of microcontroller 1 simultaneously.When needs disconnect relay 5 contacts, it is a low level that microcontroller 1 execution instruction makes P1.0, and P1.1 is high level.
Claims (3)
1. an output control circuit, it is characterized in that: one of (1) two output interface of microcontroller is connected with the light emitting diode negative pole of photoelectrical coupler (3), and another output interface of microcontroller (1) is connected with the light emitting diode of photoelectrical coupler (3) is anodal through current-limiting resistor (2); Photoelectrical coupler (3) is connected with large power triode (4); Large power triode (4) is connected with the relay (5) for driving external circuit.
2. output control circuit according to claim 1, it is characterized in that: described microcontroller (1) is single-chip microcomputer or Programmadle logic device or SOC chip.
3. output control circuit according to claim 1, it is characterized in that: described relay (5) is mechanical relay or solid-state relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320418565 CN203350664U (en) | 2013-07-15 | 2013-07-15 | Output control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320418565 CN203350664U (en) | 2013-07-15 | 2013-07-15 | Output control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203350664U true CN203350664U (en) | 2013-12-18 |
Family
ID=49750541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320418565 Expired - Fee Related CN203350664U (en) | 2013-07-15 | 2013-07-15 | Output control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203350664U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111681910A (en) * | 2019-03-11 | 2020-09-18 | Ls产电株式会社 | Coil driving device of electromagnetic contactor |
-
2013
- 2013-07-15 CN CN 201320418565 patent/CN203350664U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111681910A (en) * | 2019-03-11 | 2020-09-18 | Ls产电株式会社 | Coil driving device of electromagnetic contactor |
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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: 20131218 Termination date: 20170715 |