CN211788827U - Relay misoperation prevention device - Google Patents
Relay misoperation prevention device Download PDFInfo
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- CN211788827U CN211788827U CN202020818512.XU CN202020818512U CN211788827U CN 211788827 U CN211788827 U CN 211788827U CN 202020818512 U CN202020818512 U CN 202020818512U CN 211788827 U CN211788827 U CN 211788827U
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Abstract
The utility model relates to a relay prevents mistake and moves device, including first power control circuit, second power control circuit and relay action circuit, whether export through first automatically controlled switch control relay drive power supply among the first power control circuit, whether export through second automatically controlled switch control relay control power supply among the second power control circuit, relay action circuit includes the third opto-coupler, the relay control power supply is connected to the input of the illuminator of third opto-coupler, the output of illuminator is used for the input relay control signal, relay drive power supply is connected to the input of photic ware, the control coil of relay is connected to the output of photic ware. When the relay does not need to be operated, the control relay driving power supply and the control power supply are not output any more, even if signal interference exists, the relay can not act due to the fact that the control power supply and the driving power supply in the relay action circuit are not powered, and the problem of relay misoperation caused by electromagnetic interference can be effectively solved.
Description
Technical Field
The utility model relates to a relay mistake proofing moves device.
Background
For relays, such as low voltage motor protectors and medium and high voltage relay protection devices, the most important requirement is not to allow the relay to malfunction. If the misoperation occurs, the production is stopped, waste products, raw materials, electric power and manpower generated by start-up are lost, the continuity of the production process is seriously affected, and unnecessary loss is caused. Normally, the relay control coil is powered by a driving power supply VDD (generally, dc 24V), and the actuation or release of the relay is controlled by an I/O port line of the embedded system, and the working power supply of the embedded system is a control power supply VCC (generally, dc 3.3V), i.e., the actuation or release of the relay is controlled by the control power supply VCC. VCC and VDD are isolated power supplies that are not supplied ground. The relay malfunction is caused by electromagnetic interference to a great extent, and the electromagnetic interference can produce great influence to the signal with lower voltage, for example, great influence is caused to a working power supply VCC or a relay control signal, especially under the condition that the electromagnetic environment is comparatively severe, and then the relay malfunction is caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a relay maloperation prevention device for solve the problem that leads to the relay maloperation because of electromagnetic interference.
In order to solve the problem, the utility model adopts the following technical scheme:
a relay misoperation prevention device comprises a first power supply control circuit, a second power supply control circuit and a relay action circuit;
the first power supply control circuit comprises a first electric control switch, the control end of the first electric control switch is used for inputting a first power supply control signal, the input end of the first electric control switch is connected with a relay driving power supply, and the output end of the first electric control switch is a driving power supply output end;
the second power supply control circuit comprises a second electric control switch, the control end of the second electric control switch is used for inputting a second power supply control signal, the input end of the second electric control switch is connected with the relay control power supply, and the output end of the second electric control switch is a control power supply output end;
the relay action circuit comprises a third optical coupler, the input end of a light emitter of the third optical coupler is connected with the control power supply output end, the output end of the light emitter of the third optical coupler is used for inputting a relay control signal, the input end of a light receiver of the third optical coupler is connected with the drive power supply output end, the output end of the light receiver of the third optical coupler is connected with one end of a control coil of the relay, and the other end of the control coil of the relay is grounded.
Preferably, first automatically controlled switch is first opto-coupler, the input of the illuminator of first opto-coupler is used for connecting a power supply, the output of the illuminator of first opto-coupler does the control end of first automatically controlled switch, the input of the photic ware of first opto-coupler does the input of first automatically controlled switch, the output of the photic ware of first opto-coupler does the output of first automatically controlled switch.
Preferably, the second electric control switch is a second optical coupler, an input end of a light emitter of the second optical coupler is used for being connected with the power supply, an output end of the light emitter of the second optical coupler is a control end of the second electric control switch, an input end of a light receiver of the second optical coupler is an input end of the second electric control switch, and an output end of the light receiver of the second optical coupler is an output end of the second electric control switch.
Preferably, the power supply is the relay control power supply.
Preferably, the first power control circuit further includes a first filter capacitor, the output end of the driving power is connected to one end of the first filter capacitor, and the other end of the first filter capacitor is grounded.
Preferably, the second power control circuit further includes a second filter capacitor, the output end of the control power is connected to one end of the second filter capacitor, and the other end of the second filter capacitor is grounded.
Preferably, the relay action circuit further includes a freewheeling diode, an anode of the freewheeling diode is grounded, and a cathode of the freewheeling diode is connected to an output terminal of the light receiver of the third optical coupler.
The utility model has the advantages that: the control power output among the relay action circuit is not the lug connection relay control power, but connect relay control power through first automatically controlled switch, make not relay control power export for relay action circuit all the time, only need control first automatically controlled switch when operating the relay and switch on, the control power of relay just gives relay action circuit through first automatically controlled switch, and in the same way, the drive power output among the relay action circuit is not lug connection relay drive power, but connects relay drive power through second automatically controlled switch, make only just control second automatically controlled switch and switch on when needing to operate the relay, relay drive power just gives relay action circuit through second automatically controlled switch. Therefore, the relay control power supply is connected with the control power supply output end through the first electric control switch, the relay drive power supply is connected with the drive power supply output end through the second electric control switch, when the relay is not required to be operated, even if the output end of the light emitter of the third optical coupler is output by corresponding control signals due to signal interference, the relay can not act because the control power supply and the drive power supply in the relay action circuit are not powered, and therefore the problem that the electromagnetic interference interferes the control signals to cause relay misoperation can be effectively solved.
Drawings
Fig. 1 is a circuit diagram of a first power supply control circuit;
FIG. 2 is a circuit diagram of a second power control circuit;
fig. 3 is a circuit diagram of a relay operating circuit.
Detailed Description
The embodiment provides a relay misoperation prevention device which comprises a first power supply control circuit, a second power supply control circuit and a relay action circuit.
The first power control circuit comprises a first electric control switch, a control end of the first electric control switch is used for inputting a first power control signal, namely a power control signal RELAY _ DO1, an input end of the first electric control switch is connected with a RELAY driving power supply VDD, and an output end of the first electric control switch is a driving power supply output end. In this embodiment, the relay driving power VDD is dc +24V, and then the output end of the driving power is used to output + 24V. The power supply control signal RELAY _ DO1 is used for controlling the on or off of the first electronic control switch, so as to realize whether the RELAY driving power supply VDD outputs +24V to the driving power supply output end. The first electric control switch is not unique in implementation mode, and may be a switch tube or an optical coupler. As shown in fig. 1, the first optical coupler is an optical coupler U1A, an input end of a light emitter of the optical coupler U1A is used for connecting a power supply (in this embodiment, the power supply is a relay control power VCC, and as other embodiments, the power supply may also be other specially-arranged power supplies), and further, an input end of the light emitter of the optical coupler U1A is connected to the relay control power VCC through a resistor R10. The output end of the light emitter of the optical coupler U1A is used for inputting a power control signal relax _ DO1, that is, the output end of the light emitter of the optical coupler U1A is the control end of the first electrically controlled switch. The input end of the light receiver of the optical coupler U1A is the input end of the first electric control switch in the above, and is connected with the relay driving power supply VDD, and the output end of the light receiver of the optical coupler U1A is the output end of the first electric control switch in the above, namely the output end of the driving power supply (namely +24V _ R), and is used for outputting + 24V. Further, in order to improve the power stability, the first power control circuit further includes a first filtering capacitor, i.e., a capacitor C01, an output terminal of the light receiver of the optocoupler U1A is connected to one end of the capacitor C01, and the other end of the capacitor C01 is grounded (i.e., +24V _ G). In this embodiment, the electrical parameter of the resistor 10 is 1.2K Ω, the model of the optocoupler U1A is panasonic AQW214, and the electrical parameter of the capacitor C01 is 220 uF/50V.
The second power supply control circuit comprises a second electric control switch, a control end of the second electric control switch is used for inputting a second power supply control signal, namely a power supply control signal RELAY _ DO2, an input end of the second electric control switch is connected with a RELAY control power supply VCC, and an output end of the second electric control switch is a control power supply output end. In this embodiment, the relay control power VCC is dc +3.3V, and then, the control power output terminal is used to output + 3.3V. The power supply control signal RELAY _ DO2 is used for controlling the on/off of the second electric control switch, so that whether the RELAY controls the power supply VCC to output +3.3V to the control power supply output end is realized. The second electric control switch is not unique in implementation mode, and may be a switch tube or an optical coupler. As shown in fig. 2, the second optical coupler is an optical coupler U1B, an input end of a light emitter of the optical coupler U1B is connected to the relay control power VCC, and further, an input end of a light emitter of the optical coupler U1B is connected to the relay control power VCC through a resistor R11. The output of the illuminator of opto-coupler U1B is the control end of the second electric control switch in the aforesaid, and the input of the photic ware of opto-coupler U1B is the input of the second electric control switch in the aforesaid, connects relay control power VCC, and the output of the photic ware of opto-coupler U1B is the output of the second electric control switch in the aforesaid, promptly for control power output end (promptly + 3.3V) for output + 3.3V. Further, in order to improve the power stability, the second power control circuit further includes a second filter capacitor, that is, a capacitor C02, an output end of the light receiver of the optocoupler U1B is connected to one end of the capacitor C02, and the other end of the capacitor C02 is grounded. In this embodiment, the electrical parameter of the resistor 11 is 1.2K Ω, the model of the optocoupler U1B is panasonic AQW214, and the electrical parameter of the capacitor C02 is 100 uF/16V.
As shown in fig. 3, the relay action circuit includes a third optical coupler (i.e., an optical coupler OP 4), an input terminal of the light emitter of the optical coupler OP4 is connected to the control power output terminal (i.e., + 3.3V), and further, an input terminal of the light emitter of the optical coupler OP4 is connected to the control power output terminal through a resistor R6. The output end of the light emitter of the optical coupler OP4 is used for inputting a RELAY control signal, namely, a RELAY control signal RELAY _ DO 3. The input end of the light receiver of the optical coupler OP4 is connected with the output end of the driving power supply (namely +24V _ R), the output end of the light receiver of the optical coupler OP4 is connected with one end of the control coil of the relay K1, and the other end of the control coil of the relay K1 is grounded (namely +24V _ G). And the contact switch of the relay K1 is arranged on the relevant circuit according to actual needs. Further, in order to accelerate the attenuation rate of the current in the control coil of the relay K1, the relay action circuit further includes a freewheeling diode D1, the anode of the freewheeling diode D1 is grounded, and the cathode of the freewheeling diode D1 is connected to the output end of the light receiver of the optical coupler OP 4. In this embodiment, an electrical parameter of the resistor R6 is 270R, a model of the optocoupler OP4 is TLP127, a model of the relay K1 is DSP2a-DC24V, and a model of the freewheeling diode D1 is 1N 4007.
When the RELAY K1 needs to be controlled, firstly, a control power VCC and a driving power VDD of the RELAY K1 are preset, namely, RELAY control signals RELAY _ DO1 and RELAY _ DO2 are output through a control I/O port line (the two RELAY control signals are low level signals at this moment), light emitters of the optocoupler U1A and the optocoupler U1B are controlled to emit light, light receivers of the optocoupler U1A and the optocoupler U1B are conducted due to the fact that the light signals are received, the driving power +24V _ R and the control power +3.3V of the RELAY are powered, and then the driving power +24V _ R and the control power +3.3V of the RELAY in the RELAY action circuit are powered. Then, the operation I/O port line of the RELAY is operated to output a RELAY control signal RELAY _ DO3 (the output RELAY control signal RELAY _ DO3 is a low level signal), so that the light emitter of the optical coupler OP4 emits light, the light receiver of the optical coupler OP4 is turned on due to receiving the light signal, the control coil of the RELAY K1 is electrified, and the contact switch is closed.
When the pull-in time of the contact switch of the RELAY K1 is up, the I/O port line is controlled to output RELAY control signals RELAY _ DO1 and RELAY _ DO2 (at the moment, the two RELAY control signals are high level signals), the light receivers of the control optocoupler U1A and the optocoupler U1B are turned off because the light signals are not received any more, the driving power supply +24V _ R and the control power supply +3.3V are powered off, and further the driving power supply +24V _ R and the control power supply +3.3V of the RELAY in the RELAY action circuit are powered off. Therefore, when the RELAY K1 is not required to be operated, the driving power supply +24V _ R and the control power supply +3.3V of the RELAY in the RELAY action circuit are powered off, if electromagnetic interference causes a RELAY control signal RELAY _ DO3 output by an operation I/O port line of the RELAY to have corresponding control signal output, namely low level output, a light receiver of the optical coupler OP4 is conducted, but because the driving power supply +24V _ R and the control power supply +3.3V of the RELAY in the RELAY action circuit are powered off, a control coil of the RELAY K1 cannot be powered on, and further a contact switch of the RELAY cannot be operated by mistake.
It should be understood that the RELAY control signals RELAY _ DO1, RELAY _ DO2, and RELAY _ DO3 may all be output by the embedded system, i.e., by the corresponding controller, and the output sequence between these three signals may be: 1. the three signals are output simultaneously, 2, the RELAY control signals RELAY _ DO1 and RELAY _ DO2 are output firstly, so that a driving power supply +24V _ R and a control power supply +3.3V of the RELAY in the RELAY action circuit are powered on, and the RELAY control signal RELAY _ DO3 is output after a certain time interval. As another embodiment, the RELAY control signals RELAY _ DO1, RELAY _ DO2, and RELAY _ DO3 may also be manually input, for example, the three RELAY control signals are implemented by three control buttons (the control buttons can output a high level signal or a low level signal), and the worker firstly inputs the RELAY control signals RELAY _ DO1 and RELAY _ DO2 by operating two of the control buttons, and then inputs the RELAY control signal RELAY _ DO3 by operating the third control button after a certain time (for example, 2 s) has elapsed. It should be understood that the present application protects the hardware circuit structure of the relay malfunction prevention apparatus, and is not in the output mode and the output sequence of the three relay control signals, and the output mode and the output sequence are only the operation mode in the subsequent practical application of the relay malfunction prevention apparatus, and the output mode and the output sequence do not affect the implementation of the hardware structure of the relay malfunction prevention apparatus.
The above embodiments are only for describing the technical solution of the present invention in a specific embodiment, and any equivalent replacement and modification or partial replacement of the present invention without departing from the spirit and scope of the present invention should be covered by the claims of the present invention.
Claims (7)
1. The relay misoperation preventing device is characterized by comprising a first power supply control circuit, a second power supply control circuit and a relay action circuit;
the first power supply control circuit comprises a first electric control switch, the control end of the first electric control switch is used for inputting a first power supply control signal, the input end of the first electric control switch is connected with a relay driving power supply, and the output end of the first electric control switch is a driving power supply output end;
the second power supply control circuit comprises a second electric control switch, the control end of the second electric control switch is used for inputting a second power supply control signal, the input end of the second electric control switch is connected with the relay control power supply, and the output end of the second electric control switch is a control power supply output end;
the relay action circuit comprises a third optical coupler, the input end of a light emitter of the third optical coupler is connected with the control power supply output end, the output end of the light emitter of the third optical coupler is used for inputting a relay control signal, the input end of a light receiver of the third optical coupler is connected with the drive power supply output end, the output end of the light receiver of the third optical coupler is connected with one end of a control coil of the relay, and the other end of the control coil of the relay is grounded.
2. The relay malfunction prevention device according to claim 1, wherein the first electrical control switch is a first optical coupler, an input end of a light emitter of the first optical coupler is used for connecting a power supply, an output end of the light emitter of the first optical coupler is a control end of the first electrical control switch, an input end of a light receiver of the first optical coupler is an input end of the first electrical control switch, and an output end of the light receiver of the first optical coupler is an output end of the first electrical control switch.
3. The relay malfunction prevention device according to claim 2, wherein the second electrical control switch is a second optical coupler, an input end of a light emitter of the second optical coupler is used for connecting the power supply, an output end of the light emitter of the second optical coupler is a control end of the second electrical control switch, an input end of a light receiver of the second optical coupler is an input end of the second electrical control switch, and an output end of the light receiver of the second optical coupler is an output end of the second electrical control switch.
4. The relay malfunction prevention apparatus according to claim 3, wherein the power supply source is the relay control power source.
5. The relay malfunction prevention apparatus according to claim 1, wherein the first power control circuit further includes a first filter capacitor, the output terminal of the driving power is connected to one end of the first filter capacitor, and the other end of the first filter capacitor is grounded.
6. The relay malfunction prevention device according to claim 1, wherein the second power supply control circuit further comprises a second filter capacitor, the control power supply output terminal is connected to one end of the second filter capacitor, and the other end of the second filter capacitor is grounded.
7. The relay malfunction prevention device according to claim 1, wherein the relay operation circuit further includes a freewheeling diode, an anode of the freewheeling diode is grounded, and a cathode of the freewheeling diode is connected to an output terminal of the light receiver of the third optical coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020818512.XU CN211788827U (en) | 2020-05-18 | 2020-05-18 | Relay misoperation prevention device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020818512.XU CN211788827U (en) | 2020-05-18 | 2020-05-18 | Relay misoperation prevention device |
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| Publication Number | Publication Date |
|---|---|
| CN211788827U true CN211788827U (en) | 2020-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020818512.XU Active CN211788827U (en) | 2020-05-18 | 2020-05-18 | Relay misoperation prevention device |
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|---|---|
| CN (1) | CN211788827U (en) |
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- 2020-05-18 CN CN202020818512.XU patent/CN211788827U/en active Active
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