CN104241024A - Relay control circuit - Google Patents
Relay control circuit Download PDFInfo
- Publication number
- CN104241024A CN104241024A CN201310229696.0A CN201310229696A CN104241024A CN 104241024 A CN104241024 A CN 104241024A CN 201310229696 A CN201310229696 A CN 201310229696A CN 104241024 A CN104241024 A CN 104241024A
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- CN
- China
- Prior art keywords
- optocoupler
- relay circuit
- control circuit
- triode
- relay
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
A relay control circuit comprises an electric signal isolation control circuit and a triode driving relay circuit connected with the electric signal isolation control circuit; the isolation control circuit comprises an optocoupler, a pull-up resistor and a single-chip microcomputer control signal input end, one pin of the input end of the optocoupler is connected with a power source through the pull-up resistor, and the other pin of the input end of the optocoupler is connected to the single-chip microcomputer control signal input end; the output end of the optocoupler is connected with the PNP type triode driving relay circuit in parallel. The relay control circuit has the advantages that because the input and the output of the optocoupler are isolated, electric signals are transmitted in one direction, and the optocoupler has good electric insulating capacity and good anti-interference capacity.
Description
Technical field
The invention belongs to field of power electronics, especially relate to a kind of control relay circuit.
Background technology
Relay is a kind of electric control device, usually be applied in the control circuit of automation, it is actually the one " automatic switch " going to control big current running with small area analysis, when input variable (as voltage, electric current, temperature etc.) reaches setting, relay makes controlled output circuit be turned on or off.At present, the control relay circuit generally applied is for driving relay circuit by single-chip microcomputer one pin connecting triode, in monitoring technique field, because the integration degree of circuit and equipment is very high, very high common-mode voltage is there is between each node, produce very large interference, just need to eliminate this electromagnetic interference, equipment is normally worked.
Summary of the invention
It is simple that the problem to be solved in the present invention is to provide a kind of structure, and cost is low, and antijamming capability is strong, the control relay circuit that transmission rate is fast.
For solving the problems of the technologies described above, a kind of control relay circuit of the present invention, comprises electric signal isolation control circuit and connected triode drives relay circuit; Isolation control circuit comprises optocoupler, pull-up resistor and Single-chip Controlling signal input part, and input one pin of optocoupler connects power supply by pull-up resistor, another pin access Single-chip Controlling signal input part; The output triode in parallel of optocoupler drives relay circuit.
Preferably, described triode drives relay circuit to be that PNP type triode drives relay circuit.
The advantage that the present invention has and good effect are: owing to isolating mutually between optocoupler input and output, electric signal transmission has the features such as one-way, so optocoupler has good electrical isolation capabilities and antijamming capability.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present invention.
Embodiment
As shown in Figure 1, a kind of control relay circuit of the present invention, comprises optocoupler U10, resistance R18 and triode and drives relay circuit, the input pin 1 of optocoupler U10 connects power supply by current-limiting resistance R18, pin 2 order sheet machine control signal input, pin 3 ground connection, the output triode in parallel of optocoupler U10 drives relay circuit, triode drives relay circuit to comprise PNP type triode Q1, resistance R24, resistance R12, sustained diode 15 and relay K 1, the emitter of triode Q1 connects 5V power supply, resistance R24 is provided with between emitter and base stage, base stage connects the pin 4 of optocoupler U10 by resistance R12, relay K 1 is connected between collector electrode and ground as collector load, sustained diode 15 and relay K 1 coils from parallel connection of coils, the model of optocoupler U10 is PC817 DIP4, and the model of relay K 1 is HRS4H/DC-5V.
The course of work of this example: by conducting and the isolation of Single-chip Controlling optocoupler U10, when during isolation, triode drives relay circuit to be input as 0V, triode Q1 is saturated, thus makes relay K 1 coil have suitable electric current to flow through, relay K 1 adhesive; On the contrary, during optocoupler U10 conducting, be input as positive voltage+V, triode Q1 ends, and relay K 1 discharges; When input voltage becomes 0V from+V, triode Q1 becomes cut-off from saturated, the electric current flowing through relay K 1 coil will reduce rapidly, at this moment coil can produce c, e two interpolar being added in Q1 after very high self induction electromotive force superposes with supply voltage, sustained diode 15, can by the forward conduction voltage of the self induction electromotive force clamper of coil in it, make triode can not be breakdown.
Above one embodiment of the present of invention have been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the present patent application scope change and improve, and all should still belong within patent covering scope of the present invention.
Claims (2)
1. a control relay circuit, comprises triode and drives relay circuit, it is characterized in that: described triode drives relay circuit front end to be connected with electric signal isolation control circuit; Electric signal isolation control circuit comprises optocoupler, pull-up resistor and Single-chip Controlling signal input part, input one pin of optocoupler connects power supply by pull-up resistor, another pin access Single-chip Controlling signal input part, the output triode in parallel of optocoupler drives relay circuit.
2. a kind of control relay circuit according to claim 1, is characterized in that: described triode drives relay circuit to be that PNP type triode drives relay circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310229696.0A CN104241024A (en) | 2013-06-08 | 2013-06-08 | Relay control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310229696.0A CN104241024A (en) | 2013-06-08 | 2013-06-08 | Relay control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104241024A true CN104241024A (en) | 2014-12-24 |
Family
ID=52228907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310229696.0A Pending CN104241024A (en) | 2013-06-08 | 2013-06-08 | Relay control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104241024A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104698291A (en) * | 2015-02-03 | 2015-06-10 | 杭州海兴电力科技股份有限公司 | Detection circuit and detection method for three-phase four-wire system defective zero line function |
| CN105656466A (en) * | 2015-12-30 | 2016-06-08 | 苏州博众精工科技有限公司 | Control circuit based on switching action of triode |
| CN106653482A (en) * | 2016-11-03 | 2017-05-10 | 江苏英索纳智能科技有限公司 | Self-tuning relay anti-adhesion circuit and control method thereof |
| CN107730742A (en) * | 2017-09-07 | 2018-02-23 | 潍坊学院 | One kind water saving Intelligent management control system |
| CN111198522A (en) * | 2019-11-28 | 2020-05-26 | 广州民航职业技术学院 | Interface circuit including multiple output types and control method thereof |
-
2013
- 2013-06-08 CN CN201310229696.0A patent/CN104241024A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104698291A (en) * | 2015-02-03 | 2015-06-10 | 杭州海兴电力科技股份有限公司 | Detection circuit and detection method for three-phase four-wire system defective zero line function |
| CN104698291B (en) * | 2015-02-03 | 2018-09-25 | 杭州海兴电力科技股份有限公司 | Three-phase four-wire system lacks zero curve Function detection circuit and detection method |
| CN105656466A (en) * | 2015-12-30 | 2016-06-08 | 苏州博众精工科技有限公司 | Control circuit based on switching action of triode |
| CN106653482A (en) * | 2016-11-03 | 2017-05-10 | 江苏英索纳智能科技有限公司 | Self-tuning relay anti-adhesion circuit and control method thereof |
| CN106653482B (en) * | 2016-11-03 | 2019-02-26 | 江苏英索纳智能科技有限公司 | Self-correcting relay anti-adhesion circuit and its control method |
| CN107730742A (en) * | 2017-09-07 | 2018-02-23 | 潍坊学院 | One kind water saving Intelligent management control system |
| CN107730742B (en) * | 2017-09-07 | 2020-09-08 | 潍坊学院 | Water-saving intelligent management control system |
| CN111198522A (en) * | 2019-11-28 | 2020-05-26 | 广州民航职业技术学院 | Interface circuit including multiple output types and control method thereof |
| CN111198522B (en) * | 2019-11-28 | 2022-03-29 | 广州民航职业技术学院 | Interface circuit including multiple output types and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141224 |