CN208092205U - A kind of closed-loop detection circuit for detecting relay output state - Google Patents
A kind of closed-loop detection circuit for detecting relay output state Download PDFInfo
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- CN208092205U CN208092205U CN201820674471.4U CN201820674471U CN208092205U CN 208092205 U CN208092205 U CN 208092205U CN 201820674471 U CN201820674471 U CN 201820674471U CN 208092205 U CN208092205 U CN 208092205U
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Abstract
The utility model discloses a kind of closed-loop detection circuits for detecting relay output state, including relay drive circuit, relay drive circuit is connect with relay, relay is connect with output relay state level circuit, outside need ON-OFF control circuit is accessed in one group of contact of double-pole single-throw (D.P.S.T.) relay, another group of contact portion output relay state level circuit of double-pole single-throw (D.P.S.T.) relay, output relay state level circuit are connect with optical coupling isolation circuit.The utility model has the characteristics that simple in structure, low cost, safe and real time monitoring.
Description
Technical field
The utility model is related to detection circuit technology, a kind of specifically closed loop for detecting relay output state
Detection circuit.
Background technology
In modern electronic technology field, relay is very wide as a kind of isolated switch control device utilization
It is general.With also more and more extensive in the field of industrial automatic control.
With the complication of controller function and the diversification of application scenarios, to the stability and anti-interference ability of controller
It is required that also higher and higher.The case where inevitably will appear out of control or accidentally control in relay-operated controller uses, traditional relay
Device controller does not have feedback detectability, can not detect output state, prevents the state of output abnormality from being made in time
Only.Especially in the utilization of Industry Control, the presence of such case has huge security risk.
Utility model content
The purpose of the utility model is to overcome the shortcomings of the prior art and to provide it is a kind of it is simple in structure, make
Valence is cheap, the safe and real time monitoring closed-loop detection circuit for detecting relay output state.
In order to achieve the above object, the utility model uses following technical scheme：One kind is for detecting relay output shape
The closed-loop detection circuit of state, including relay drive circuit, relay drive circuit are connect with relay, relay with output after
Electrical appliance state level circuit connects, and outside need ON-OFF control circuit, double-pole single-throw (D.P.S.T.) are accessed in one group of contact of double-pole single-throw (D.P.S.T.) relay
Another group of contact portion output relay state level circuit of relay, output relay state level circuit and light-coupled isolation electricity
Road connects.
The relay drive circuit includes triode Q1, triode Q1 collectors and relay coil cathode and diode
D2 anodes connect；Triode Q1 base stages are connect with resistance R3, resistance R4 respectively；Triode Q1 emitters respectively with resistance R4 and ground
Connection；Diode D2 cathode are connect with relay coil anode and relay power JQVCC；The resistance R3 other ends and relay control
Signal connection processed.
The output relay state level circuit includes resistance R2, and the one end resistance R2 is connect with relay power JQVCC,
Resistance R2 other end connection detection circuit.
The optical coupling isolation circuit includes photoelectrical coupler U1,1 foot and diode D1 cathode and the electricity of photoelectrical coupler U1
Hold the connection of the one end C1；2 feet of photoelectrical coupler U1 are connect with diode D1 anodes, the capacitance C1 other ends and ground；Photoelectrical coupler
6 feet of U1 are connected to digital power anode VDD by resistance R1；The 6 feet connection relay status signal of photoelectrical coupler U1 is defeated
Go out；4 feet of photoelectrical coupler U1 are grounded.
The utility model compared with the existing technology, has the following advantages and effect：
1, the utility model includes relay drive circuit, and relay drive circuit is connect with relay, relay with it is defeated
Go out the connection of relay status level circuit, outside need ON-OFF control circuit, double-pole are accessed in one group of contact of double-pole single-throw (D.P.S.T.) relay
Singly throw another group of contact portion output relay state level circuit of relay, output relay state level circuit and optocoupler every
It is connected from circuit, has the characteristics that simple in structure, low cost, safe and real time monitoring.
2, the optical coupling isolation circuit in the utility model includes photoelectrical coupler U1,1 foot of photoelectrical coupler U1 and two poles
Pipe D1 cathode are connected with the one end capacitance C1；2 feet of photoelectrical coupler U1 connect with diode D1 anodes, the capacitance C1 other ends and ground
It connects；6 feet of photoelectrical coupler U1 are connected to digital power anode VDD by resistance R1；6 feet of photoelectrical coupler U1 connect relay
Device status signal exports；4 feet of photoelectrical coupler U1 are grounded；Due to the design using optical coupling isolation circuit so that the controller
Circuit is isolated with relay drive circuit, is efficiently solved and is interfered with controller by relay drive circuit introducing, improves
The job stability of controller.Since circuit uses double-pole single-throw (D.P.S.T.) relay, optocoupler circuit is made to be returned with external switch
Road is isolated, and reduces the complexity of circuit design, improves the reliability of system.
3, the utility model circuit is simple, at low cost, fast response time, reliable working performance.It only needs to detect when use
The low and high level level of relay status signal, you can judge the working condition of relay.
Description of the drawings
Fig. 1 is a kind of circuit diagram for detecting the closed-loop detection circuit of relay output state.
Specific implementation mode
For ease of it will be appreciated by those skilled in the art that making with reference to the accompanying drawings and embodiments to the utility model further detailed
It describes in detail bright.
Embodiment 1：
As shown in Figure 1, a kind of closed-loop detection circuit for detecting relay output state, including relay driving electricity
Road, relay drive circuit are connect with relay, and relay is connect with output relay state level circuit, double-pole single-throw (D.P.S.T.) relay
Outside need ON-OFF control circuit, another group of contact portion output relay state of double-pole single-throw (D.P.S.T.) relay are accessed in one group of contact of device
Level circuit, output relay state level circuit are connect with optical coupling isolation circuit.
Relay drive circuit in the present embodiment includes triode Q1, triode Q1 collectors and relay coil cathode
It is connected with diode D2 anodes；Triode Q1 base stages are connect with resistance R3, resistance R4 respectively；Triode Q1 emitters respectively with electricity
It hinders R4 and ground connects；Diode D2 cathode are connect with relay coil anode and relay power JQVCC；The resistance R3 other ends with
Relay control signal connects.
Output relay state level circuit in the present embodiment includes resistance R2, the one end resistance R2 and relay power
JQVCC connections, resistance R2 other end connection detection circuit.
Optical coupling isolation circuit in the present embodiment includes photoelectrical coupler U1,1 foot and the diode D1 of photoelectrical coupler U1
Cathode is connected with the one end capacitance C1；2 feet of photoelectrical coupler U1 are connect with diode D1 anodes, the capacitance C1 other ends and ground；Light
6 feet of electric coupler U1 are connected to digital power anode VDD by resistance R1；6 feet of photoelectrical coupler U1 connect relay shape
State signal exports；4 feet of photoelectrical coupler U1 are grounded.
In actual use, in relay control signal line input high level, relay contact is attracted the present embodiment, input
When low level, relay contact disconnects.Relay status signal is exported by relay status signal wire, it is only necessary to detect relay
The low and high level of device status signal lines output can determine whether the current state of relay：High level disconnects for relay, low level
It is attracted for relay.Circuit is simple, easy to implement, and stable and reliable for performance.
When relay contact is attracted, relay power JQVCC voltages access optical coupling isolation circuit, in optical coupling isolation circuit
The conducting of portion switching tube, relay status signal wire export low level, on the contrary then export high level.Due to using optical coupling isolation circuit
Design so that the controller circuitry is isolated with relay drive circuit, is efficiently solved and is drawn by relay drive circuit
Enter to interfere with controller, improves the job stability of controller.Since circuit uses double-pole single-throw (D.P.S.T.) relay, make photoelectric coupling
Device circuit is isolated with external switch circuit, reduces the complexity of circuit design, improves the reliability of system.
Above-mentioned specific implementation mode is the preferred embodiment of the utility model, can not be defined to the utility model,
Other any changes made without departing from the technical solution of the utility model or other equivalent substitute modes, are included in
Within the scope of protection of the utility model.
Claims (4)
1. a kind of closed-loop detection circuit for detecting relay output state, it is characterised in that：Including relay drive circuit,
Relay drive circuit is connect with relay, and relay is connect with output relay state level circuit, double-pole single-throw (D.P.S.T.) relay
Outside need ON-OFF control circuit, another group of contact portion output relay state electricity of double-pole single-throw (D.P.S.T.) relay are accessed in one group of contact
Ordinary telegram road, output relay state level circuit are connect with optical coupling isolation circuit.
2. the closed-loop detection circuit according to claim 1 for detecting relay output state, it is characterised in that：It is described
Relay drive circuit includes triode Q1, and triode Q1 collectors are connect with relay coil cathode and diode D2 anodes；
Triode Q1 base stages are connect with resistance R3, resistance R4 respectively；Triode Q1 emitters respectively with resistance R4 and connect；Diode
D2 cathode are connect with relay coil anode and relay power JQVCC；The resistance R3 other ends are connect with relay control signal.
3. the closed-loop detection circuit according to claim 2 for detecting relay output state, it is characterised in that：It is described
Output relay state level circuit includes resistance R2, and the one end resistance R2 is connect with relay power JQVCC, the resistance R2 other ends
Connection detection circuit.
4. the closed-loop detection circuit according to claim 3 for detecting relay output state, it is characterised in that：It is described
Optical coupling isolation circuit includes photoelectrical coupler U1, and 1 foot of photoelectrical coupler U1 is connect with diode D1 cathode and the one end capacitance C1；
2 feet of photoelectrical coupler U1 are connect with diode D1 anodes, the capacitance C1 other ends and ground；6 feet of photoelectrical coupler U1 pass through electricity
Resistance R1 is connected to digital power anode VDD；The 6 feet connection relay status signal output of photoelectrical coupler U1；Photoelectrical coupler
4 feet of U1 are grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820674471.4U CN208092205U (en) | 2018-05-08 | 2018-05-08 | A kind of closed-loop detection circuit for detecting relay output state |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820674471.4U CN208092205U (en) | 2018-05-08 | 2018-05-08 | A kind of closed-loop detection circuit for detecting relay output state |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208092205U true CN208092205U (en) | 2018-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820674471.4U Active CN208092205U (en) | 2018-05-08 | 2018-05-08 | A kind of closed-loop detection circuit for detecting relay output state |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111398806A (en) * | 2020-05-06 | 2020-07-10 | 桂林航天电子有限公司 | Initial state detection circuit of solid state relay contact |
| CN111953264A (en) * | 2020-08-12 | 2020-11-17 | 深圳市海浦蒙特科技有限公司 | Synchronous motor control circuit |
-
2018
- 2018-05-08 CN CN201820674471.4U patent/CN208092205U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111398806A (en) * | 2020-05-06 | 2020-07-10 | 桂林航天电子有限公司 | Initial state detection circuit of solid state relay contact |
| CN111953264A (en) * | 2020-08-12 | 2020-11-17 | 深圳市海浦蒙特科技有限公司 | Synchronous motor control circuit |
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