CN112114251A - Relay switch state monitoring circuit and control method and air conditioner - Google Patents
Relay switch state monitoring circuit and control method and air conditioner Download PDFInfo
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- CN112114251A CN112114251A CN202011099476.7A CN202011099476A CN112114251A CN 112114251 A CN112114251 A CN 112114251A CN 202011099476 A CN202011099476 A CN 202011099476A CN 112114251 A CN112114251 A CN 112114251A
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- monitoring circuit
- state monitoring
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000002955 isolation Methods 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- General Engineering & Computer Science (AREA)
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- General Physics & Mathematics (AREA)
- Keying Circuit Devices (AREA)
Abstract
The invention discloses a relay on-off state monitoring circuit, a control method and an air conditioner, wherein the relay on-off state monitoring circuit comprises a direct current power supply DC, a relay K and a load which are sequentially connected in series, a monitoring module is connected between the relay K and the load in series, the monitoring module monitors the relay K and feeds an on-off state signal back to a controller, and the controller judges whether the relay K is normally switched on or off and controls the on-off state of the relay K; the invention can detect whether the relay has mechanical failure in time, and can try to recover the normal work of the relay when the relay has mechanical failure; the reliability of the equipment is greatly improved, and the device has the advantages of reliable operation, simple structure and low cost.
Description
Technical Field
The invention relates to electrical equipment, in particular to a relay switch state monitoring circuit, a control method and an air conditioner.
Background
The relay has a certain mechanical service life, and when the relay has a mechanical fault, the circuit abnormity caused by the relay fault cannot be detected in time. Therefore, the state of the relay is monitored very necessarily, so that circuit abnormity caused by mechanical damage of the relay can be solved in time, and the stability and reliability of hardware circuit work are improved.
The existing relay detection circuit has the defects of complex circuit and high cost, so how to design a relay switch state monitoring circuit, a control method and an air conditioner is a technical problem to be solved urgently in the industry.
Disclosure of Invention
In order to overcome the defects of complex circuit and high cost in the prior art, the invention provides a relay switch state monitoring circuit, a control method and an air conditioner.
The technical scheme includes that the relay switch state monitoring circuit comprises a direct-current power supply DC, a relay K and a load which are sequentially connected in series, a monitoring module is connected between the relay K and the load in series, the monitoring module monitors the relay K and feeds a switch state signal back to a controller, and the controller judges whether the relay K is normally switched and controls the on-off of the relay K.
The monitoring module comprises a monitoring resistor R1 and an isolation feedback module connected in parallel with the monitoring resistor R1; one end of the monitoring resistor R1 is connected with the relay K, and the other end is grounded; the isolation feedback module feeds back a switch state signal to the controller.
The isolation feedback module comprises an optical coupler U, wherein the anode of the input side of the optical coupler U is connected with the relay K through a second resistor R2, the cathode of the input side of the optical coupler U is grounded with the emitter of the output side of the optical coupler U, the collector of the output side of the optical coupler U is connected with a control power supply Vcc through a fourth resistor R4, and the collector is also connected with a signal acquisition point A to feed back a level signal representing a switch state signal to the controller.
And a coil of the relay K is connected between the control power supply Vcc and a terminal B in series, the coil of the relay K is connected with a freewheeling diode D2 in parallel, and the terminal B is connected with the controller.
The coil of the relay K is connected with a third resistor R3 in parallel.
The control power Vcc is connected to the anode of the first diode D1, and the cathode of the first diode D1 is connected to the anode of the DC power DC.
The voltage of the direct current power supply DC is higher than the control power supply Vcc.
The invention also designs a control method of the relay switch state monitoring circuit, wherein the monitoring circuit adopts the relay switch state monitoring circuit and comprises the following control steps: and electrifying the controller, monitoring a switch state signal of the relay K, judging whether the switch of the relay K is normal or not, and controlling the on-off of the relay K.
The control method specifically comprises the following steps:
step 1, monitoring the voltage of a signal acquisition point A and a terminal B, comparing the monitored voltage with prestored parameters in a controller, and further judging whether a relay K is in fault; if no fault exists, the monitoring is finished, and if the fault exists, the step 2 is carried out;
step 2, sending a reset pulse to a K coil of the relay;
step 3, monitoring the voltage of the signal acquisition point A and the voltage of the terminal B, comparing the monitored voltage with prestored parameters in the controller, and further judging whether the relay K is in fault; if no fault exists, turning to the step 4, and if the fault exists, turning to the step 5;
step 4, recording the failure times of the relay K, and finishing monitoring;
step 5, feeding back a fault signal of the relay K, and turning to step 6;
and 6, finishing monitoring and waiting for next power-on.
The prestored parameters are truth tables reflecting the corresponding relation between the voltage of the signal acquisition point A and the voltage of the terminal B and the fault of the relay K.
The invention also designs an air conditioner which adopts the relay switch state monitoring circuit.
The invention also designs an air conditioner which adopts the control method of the relay switch state monitoring circuit.
The technical scheme provided by the invention has the beneficial effects that:
the invention can detect whether the relay has mechanical failure in time, and can try to recover the normal work of the relay when the relay has mechanical failure; the reliability of the equipment is greatly improved, and the device has the advantages of reliable operation, simple structure and low cost.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a circuit diagram of a preferred embodiment;
FIG. 2 is a control flow diagram of the preferred embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention discloses a relay switch state monitoring circuit which comprises a direct-current power supply DC, a relay K and a load which are sequentially connected in series, wherein a monitoring module is connected between the relay K and the load in series, the monitoring module monitors the relay K and feeds a switch state signal back to a controller, and the controller judges whether the relay K is normally switched and controls the on-off of the relay K. The invention can solve the following technical problems: when the controller does not send a control instruction, the load controlled by the relay (normally open) works. The controller has no effective control over the relay.
Referring to the circuit diagram of the preferred embodiment shown in fig. 1, the monitoring module includes a monitoring resistor R1 and an isolated feedback module connected in parallel therewith; one end of the monitoring resistor R1 is connected with the relay K, and the other end of the monitoring resistor R1 is grounded (the monitoring resistor R1 is simultaneously used as a pull-down resistor of the optocoupler U); the isolation feedback module feeds back a switch state signal to the controller. The isolation feedback module comprises an optocoupler U, wherein an anode on an input side of the optocoupler U is connected with the relay K through a second resistor R2, a cathode on the input side of the optocoupler U is grounded with an emitter on an output side of the optocoupler U, a collector on an output side of the optocoupler U is connected with a control power supply Vcc through a fourth resistor R4 (a monitoring resistor R1 and a second resistor R2 are current-limiting resistors, and a fourth resistor R4 is a pull-up resistor), and the collector is also connected with a signal acquisition point A to feed back a level signal representing a switching state signal to the controller. And a coil of the relay K is connected between the control power supply Vcc and a terminal B in series, the coil of the relay K is connected with a freewheeling diode D2 in parallel, and the terminal B is connected with the controller. The coil of the relay K is connected with a third resistor R3 in parallel, and the third resistor R3 is a current-limiting resistor. The control power Vcc is connected to the anode of the first diode D1, and the cathode of the first diode D1 is connected to the anode of the DC power DC. The voltage of the direct current power supply DC is higher than the control power supply Vcc. It should be noted that, in the determination of the preferred embodiment, the DC power supply DC is turned off, and the power supply Vcc needs to be controlled to supply power to the optocoupler. Vcc is always present and the first diode D1 is added only to serve as isolation of the two sources when the load is running.
The working principle of the present invention will be described in detail below with reference to fig. 1 (DI is the relay switch state feedback interface and DO is the relay control interface):
when the circuit works, the point B is a low potential, the relay K is closed, the D1 is in a cut-off state, the load power supply DC and the control power supply Vcc are isolated, and the DC supplies power to the load. At this time point a remains low. When the load stops running, the B sends out high potential, the relay is disconnected, at the moment, the R1 pulls the upper end of the optical coupler input into low potential, the U stops working, and the point A is pulled up to high potential by the R4. That is, when the load is operating, the potential at point a is kept low, and when the load is not operating, the potential at point a is kept high.
When the relay is damaged mechanically, the judgment is divided into two conditions:
(1) after the coil of the relay K is electrified, namely DO is a low potential, the contact of the relay K cannot be closed, the point A still keeps a high potential, the logic is judged, the point B is a low potential, the point A is a high potential, and the abnormal condition that the relay K cannot be closed is judged.
(2) After the coil of the relay K is powered off, namely DO is high potential, the contact of the relay K cannot be disconnected, the point A still keeps low potential at the moment, the judgment logic is that the point B is high potential and the point A is low potential, and the abnormity that the relay K cannot be disconnected is judged at the moment.
The invention also discloses a control method of the relay switch state monitoring circuit, the monitoring circuit adopts the relay switch state monitoring circuit and comprises the following control steps: and electrifying the controller, monitoring a switch state signal of the relay K, judging whether the switch of the relay K is normal or not, and controlling the on-off of the relay K.
Referring to the control flow chart of the preferred embodiment shown in fig. 2, the control method specifically includes the following steps:
step 1, monitoring the voltage of a signal acquisition point A and a terminal B, comparing the monitored voltage with prestored parameters in a controller, and further judging whether a relay K is in fault; if no fault exists, the monitoring is finished, and if the fault exists, the step 2 is carried out;
step 2, sending a reset pulse to a K coil of the relay;
step 3, monitoring the voltage of the signal acquisition point A and the voltage of the terminal B, comparing the monitored voltage with prestored parameters in the controller, and further judging whether the relay K is in fault; if no fault exists, turning to the step 4, and if the fault exists, turning to the step 5;
step 4, recording the failure times of the relay K, and finishing monitoring;
step 5, feeding back a fault signal of the relay K, and turning to step 6;
and 6, finishing monitoring and waiting for next power-on.
In a preferred embodiment, the pre-stored parameters are a truth table representing the correspondence between the voltage of the signal acquisition point a and the terminal B and whether the relay K has a fault. The truth table may take the form:
the controller can check the truth table to quickly judge whether the relay K has mechanical faults or not. It should be noted that the truth table may be data stored in a memory unit of the controller, or may be a circuit constructed by logic components.
For a normally closed relay, the truth table judgment logic is opposite.
After judging that the relay K has a mechanical fault, in order to judge whether the relay K is completely damaged or is blocked due to respective times, the controller sends a recovery pulse to the relay K (point B). The recovery pulse is composed of a pulse string with a certain period, and aims to enable the relay to be repeatedly switched on and off, see whether the fault can be eliminated, if the fault can be eliminated, the fault indicates that the on and off of the relay is abnormal only occasionally, and the controller records the event times. If the failure can not be eliminated, the irreversible damage of the relay is generated, the controller feeds back the fault information of the relay, and the damage of the relay is prompted, and the relay needs to be replaced.
The invention also discloses an air conditioner, which adopts the relay switch state monitoring circuit.
The invention also discloses an air conditioner, and the air conditioner adopts the control method of the relay switch state monitoring circuit.
The foregoing examples are illustrative only and are not intended to be limiting. Any equivalent modifications or variations without departing from the spirit and scope of the present application should be included in the claims of the present application.
Claims (12)
1. The utility model provides a relay on-off state monitoring circuit, is including direct current power supply DC, relay K, the load that establishes ties in proper order, its characterized in that, concatenate monitoring module between relay K and the load, monitoring module monitoring relay K feeds back switch state signal to the controller, the controller judges whether relay K switch is normal, and control relay K's break-make.
2. The relay switch state monitoring circuit of claim 1, wherein the monitoring module comprises a monitoring resistor R1 and an isolated feedback module connected in parallel therewith; one end of the monitoring resistor R1 is connected with the relay K, and the other end is grounded; the isolation feedback module feeds back a switch state signal to the controller.
3. The relay switch state monitoring circuit according to claim 2, wherein the isolation feedback module comprises an optocoupler U, an anode at an input side of the optocoupler U is connected with the relay K through a second resistor R2, a cathode at the input side of the optocoupler U is connected with an emitter at an output side of the optocoupler U, the cathode at the input side of the optocoupler U is connected with the emitter at the output side of the optocoupler U, a collector at the output side of the optocoupler U is connected with a control power supply Vcc through a fourth resistor R4, and the collector is further connected with a signal acquisition point A.
4. The relay switch state monitoring circuit of claim 3, wherein the coil of the relay K is connected in series between the control power supply Vcc and a terminal B, the coil of the relay K is connected in parallel with a freewheeling diode D2, and the terminal B is connected to the controller.
5. The relay switch state monitoring circuit of claim 4, wherein the relay K coil is connected in parallel with a third resistor R3.
6. The relay switch state monitoring circuit according to any one of claims 1 to 5, wherein the control power source Vcc is connected to an anode of a first diode D1, and a cathode of a first diode D1 is connected to an anode of the DC power source DC.
7. The relay switch state monitoring circuit according to claim 6, wherein the voltage of the direct current power supply DC is higher than the control power supply Vcc.
8. A relay switch state monitoring circuit control method, characterized in that the monitoring circuit adopts the relay switch state monitoring circuit of any one of claims 1 to 7, and comprises the following control steps: and electrifying the controller, monitoring a switch state signal of the relay K, judging whether the switch of the relay K is normal or not, and controlling the on-off of the relay K.
9. The relay switch state monitoring circuit control method according to claim 8, wherein the control method specifically comprises the steps of:
step 1, monitoring the voltage of a signal acquisition point A and a terminal B, comparing the monitored voltage with prestored parameters in a controller, and further judging whether a relay K is in fault; if no fault exists, the monitoring is finished, and if the fault exists, the step 2 is carried out;
step 2, sending a reset pulse to a K coil of the relay;
step 3, monitoring the voltage of the signal acquisition point A and the voltage of the terminal B, comparing the monitored voltage with prestored parameters in the controller, and further judging whether the relay K is in fault; if no fault exists, turning to the step 4, and if the fault exists, turning to the step 5;
step 4, recording the failure times of the relay K, and finishing monitoring;
step 5, feeding back a fault signal of the relay K, and turning to step 6;
and 6, finishing monitoring and waiting for next power-on.
10. The method for controlling the relay switch state monitoring circuit according to claim 9, wherein the prestored parameters are truth tables representing the correspondence between the voltage of the signal acquisition point a and the terminal B and whether the relay K has a fault.
11. An air conditioner characterized in that the air conditioner employs the relay switch state monitoring circuit according to any one of claims 1 to 7.
12. An air conditioner characterized in that the air conditioner employs the relay switch state monitoring circuit control method according to any one of claims 8 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011099476.7A CN112114251A (en) | 2020-10-14 | 2020-10-14 | Relay switch state monitoring circuit and control method and air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011099476.7A CN112114251A (en) | 2020-10-14 | 2020-10-14 | Relay switch state monitoring circuit and control method and air conditioner |
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| CN112114251A true CN112114251A (en) | 2020-12-22 |
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| CN202011099476.7A Pending CN112114251A (en) | 2020-10-14 | 2020-10-14 | Relay switch state monitoring circuit and control method and air conditioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113534003A (en) * | 2021-06-23 | 2021-10-22 | 北京航天新立科技有限公司 | Distributor testing method |
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2020
- 2020-10-14 CN CN202011099476.7A patent/CN112114251A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113534003A (en) * | 2021-06-23 | 2021-10-22 | 北京航天新立科技有限公司 | Distributor testing method |
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