CN219105102U - Relay fault detection circuit - Google Patents
Relay fault detection circuit Download PDFInfo
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- CN219105102U CN219105102U CN202222809534.1U CN202222809534U CN219105102U CN 219105102 U CN219105102 U CN 219105102U CN 202222809534 U CN202222809534 U CN 202222809534U CN 219105102 U CN219105102 U CN 219105102U
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- relay
- fault detection
- detection unit
- state
- optocoupler
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The utility model relates to a fault detection technology of a relay, and discloses a relay fault detection circuit, which comprises a main control unit; the relay contact state detection unit is used for detecting the state of the relay contact and sending a state signal of the relay contact to the relay fault detection unit; the relay coil state detection unit is used for detecting the state of the relay coil and sending a relay coil state signal to the relay fault detection unit; the relay coil control unit is used for controlling the state of the relay and sending a control signal to the relay fault detection unit; the relay fault detection unit generates a fault detection signal and sends the fault detection signal to the main control unit, and the main control unit determines the fault state of the relay according to the received signal. The relay fault detection circuit designed by the utility model can detect the coil of the relay and the contact of the relay, and has simple design circuit and strong practicability.
Description
Technical Field
The utility model relates to a relay fault detection technology, in particular to a relay fault detection circuit.
Background
The relay is widely applied to various electronic products and mainly plays a role of a switch. In addition, if the environmental pollution level is higher in the use of the relay, the relay is likely to have faults such as adhesion, infirm attraction and the like, and auxiliary contacts are only arranged on the switch such as a large contactor and a circuit breaker in the current market for detecting the switch state. The relay on the circuit board is generally free of fault detection, so that the system cannot be identified after the relay is in fault, the whole system is in fault, and the safe operation of the system is seriously influenced.
In the prior art, CN200910041360.5 only can detect the on and off states of the relay, but cannot detect the coil state and the contacts of the relay at the same time.
Disclosure of Invention
Aiming at the problem that the detection circuit can only detect the on-off state of the relay in the prior art, the coil state and the contact of the relay cannot be detected at the same time, the utility model provides a relay fault detection circuit.
In order to solve the technical problems, the utility model is solved by the following technical scheme:
a relay fault detection circuit comprises a main control unit; the relay control device further comprises a relay coil state detection unit, a relay contact state detection unit, a relay coil control unit and a relay fault detection unit;
the relay contact state detection unit is used for detecting the state of the relay contact and sending a state signal of the relay contact to the relay fault detection unit;
the relay coil state detection unit is used for detecting the state of the relay coil and sending a relay coil state signal to the relay fault detection unit;
the relay coil control unit is used for controlling the state of the relay and sending a control signal to the relay fault detection unit; the relay fault detection unit generates a fault detection signal and sends the fault detection signal to the main control unit, and the main control unit determines the fault state of the relay according to the received signal.
Preferably, the relay contact state detection unit comprises an optical coupler U4, and the input end of the primary side in the optical coupler U4 is connected with a pull-up resistor R3; the other end of the pull-up resistor R3 is connected with an input voltage VCC2; the output end of the primary side in the optical coupler U4 is connected with a primary side D3; the negative electrode of the primary side D3 is connected with the grounding end GND 2; the input end of the secondary side in the optical coupler U4 is connected with a pull-up resistor R4; the other end of the pull-up resistor R4 is connected with an input voltage VCC1; the output end of the secondary side in the optical coupler U4 is connected with the grounding end GND1; the output voltage of the optocoupler U4 is Vout2.
Preferably, the relay coil state detection unit includes an optocoupler U3; the primary side input end of the optocoupler U3 is connected with a current-limiting resistor R2, the other end of the resistor R2 is connected with the input voltage VCC of the relay, and the primary side output end of the optocoupler U3 is connected with the relay coil control unit; the secondary side input end of the optocoupler U3 is connected with a current-limiting resistor R1, the other end of the resistor R1 is connected with an input voltage VCC1, and the primary side output end of the optocoupler U3 is connected with a grounding end GND1; the output voltage of the optocoupler U3 is Vout1.
Preferably, the relay coil control unit includes a power device Q1; the collector of the power device Q1 is connected with the relay coil state detection unit and the relay; the emitter of the power device Q1 is connected with the ground end GND; the base electrode of the power device Q1 is connected with a current limiting resistor R5; the other end of the resistor R5 is connected with a relay fault detection unit.
Preferably, the power device Q1 includes a transistor, an IGBT, or a MOSFET.
Preferably, one side of the relay coil is connected with a freewheel diode D1 in parallel; the anode of the diode D1 is connected with the collector of the power device Q1; the cathode of the diode D1 is connected to the input voltage VCC 1.
The utility model has the remarkable technical effects due to the adoption of the technical scheme:
the utility model designs a relay fault detection circuit and a relay fault detection scheme, which mainly detects a Q1 control signal, a relay coil state signal and a relay contact state signal, and judges whether the relay has faults or not through the three signals. The relay fault detection device can detect the coil fault state and the contact fault state of the relay at the same time, and is simple in design circuit and high in practicability.
Drawings
FIG. 1 is a circuit diagram of the present utility model;
FIG. 2 is a circuit diagram of embodiment 2 of the present utility model;
FIG. 3 is a flow chart of the detection of the present utility model;
Detailed Description
The present utility model will be described in further detail with reference to the accompanying drawings and examples.
Example 1
A relay fault detection circuit comprises a main control unit; the relay control device further comprises a relay coil state detection unit, a relay contact state detection unit, a relay coil control unit and a relay fault detection unit;
the relay contact state detection unit is used for detecting the state of the relay contact and sending a state signal of the relay contact to the relay fault detection unit;
the relay coil state detection unit is used for detecting the state of the relay coil and sending a relay coil state signal to the relay fault detection unit;
the relay coil control unit is used for controlling the state of the relay and sending a control signal to the relay fault detection unit; the relay fault detection unit generates a fault detection signal and sends the fault detection signal to the main control unit, and the main control unit determines the fault state of the relay according to the received signal.
The relay contact state detection unit comprises an optocoupler U4, and the input end of the primary side in the optocoupler U4 is connected with a pull-up resistor R3; the other end of the pull-up resistor R3 is connected with an input voltage VCC2; the output end of the primary side in the optical coupler U4 is connected with a primary side D3; the negative electrode of the primary side D3 is connected with the grounding end GND 2; the input end of the secondary side in the optical coupler U4 is connected with a pull-up resistor R4; the other end of the pull-up resistor R4 is connected with an input voltage VCC1; the output end of the secondary side in the optical coupler U4 is connected with the grounding end GND1; the output voltage of the optocoupler U4 is Vout2.
The relay coil state detection unit comprises an optocoupler U3; the primary side input end of the optocoupler U3 is connected with a current-limiting resistor R2, the other end of the resistor R2 is connected with the input voltage VCC of the relay, and the primary side output end of the optocoupler U3 is connected with the relay coil control unit; the secondary side input end of the optocoupler U3 is connected with a current-limiting resistor R1, the other end of the resistor R1 is connected with an input voltage VCC1, and the primary side output end of the optocoupler U3 is connected with a grounding end GND1; the output voltage of the optocoupler U3 is Vout1.
The relay coil control unit comprises a triode Q1; the collector of the triode Q1 is connected with the relay coil state detection unit and the relay; the emitter of the triode Q1 is connected with the ground end GND; the base electrode of the triode Q1 is connected with a current limiting resistor R5; the other end of the resistor R5 is connected with a relay fault detection unit.
One side of the relay coil is connected with a freewheel diode D1 in parallel; the positive electrode of the diode D1 is connected with the collector electrode of the triode Q1; the cathode of the diode D1 is connected to the input voltage VCC 1.
Example 2
On the basis of embodiment 1, the power device of this embodiment is an IGBT, unlike embodiment 1.
Example 3
On the basis of embodiment 1, the power device of this embodiment is a MOSFET, which is different from embodiments 1 and 2
Example 4
Based on the above embodiment, as can be seen from fig. 3, the relay coil control unit mainly controls the relay RLY1 coil to be powered on, when the main control IC sends out high level, the main control IC controls the Q1 to be turned on through R5, the loop VCC-RLY1-Q1-GND is turned on, the coil is powered on, and the relay is closed;
detecting whether a coil is electrified, when a power device Q1 is turned on, conducting a loop VCC-resistor R2-optocoupler U3-power device Q1-GND, conducting the primary side of the optocoupler, outputting a low level by Vout1, changing the low level into a high level by an inverter U1, and inputting the high level to U2;
and detecting whether the contact is attracted or not, and when the contact is not attracted, the loop VCC2-R3-U4-D3-GND2 is conducted, and Vout2 outputs a low level. On the contrary, when the contact is attracted, the loop VCC 2-resistor R3-diode D2-relay RLY1-GND2 is conducted, U4 is not electrified, and Vout2 is high level;
the relay fault detection unit U2 is a three-input AND gate, and judges whether the relay has a fault or not according to the signal states of the three relay coil state detection units and the relay contact state detection unit according to the Q1 control signal; when the relay is in fault, the relay is turned on by high level, the level input to the AND gate is high level, and the AND gate outputs the high level to the main control IC; when the relay is faulty, the relay is turned on by transmitting a high level, and the level input to the AND gate has at least one low level, and the AND gate outputs the low level to the control IC, and the control IC judges that the relay is in a faulty state at the moment.
Claims (6)
1. A relay fault detection circuit comprises a main control unit; the relay control device is characterized by further comprising a relay coil state detection unit, a relay contact state detection unit, a relay coil control unit and a relay fault detection unit;
the relay contact state detection unit is used for detecting the state of the relay contact and sending a state signal of the relay contact to the relay fault detection unit;
the relay coil state detection unit is used for detecting the state of the relay coil and sending a relay coil state signal to the relay fault detection unit;
the relay coil control unit is used for controlling the state of the relay and sending a control signal to the relay fault detection unit; the relay fault detection unit generates a fault detection signal and sends the fault detection signal to the main control unit, and the main control unit determines the fault state of the relay according to the received signal.
2. The relay fault detection circuit according to claim 1, wherein the relay contact state detection unit comprises an optocoupler U4, and an input end of a primary side in the optocoupler U4 is connected with a pull-up resistor R3; the other end of the pull-up resistor R3 is connected with an input voltage VCC2; the output end of the primary side in the optical coupler U4 is connected with a primary side D3; the negative electrode of the primary side D3 is connected with the grounding end GND 2; the input end of the secondary side in the optical coupler U4 is connected with a pull-up resistor R4; the other end of the pull-up resistor R4 is connected with an input voltage VCC1; the output end of the secondary side in the optical coupler U4 is connected with the grounding end GND1; the output voltage of the optocoupler U4 is Vout2.
3. The relay failure detection circuit according to claim 1, wherein the relay coil state detection unit includes an optocoupler U3; the primary side input end of the optocoupler U3 is connected with a current-limiting resistor R2, the other end of the resistor R2 is connected with the input voltage VCC of the relay, and the primary side output end of the optocoupler U3 is connected with the relay coil control unit; the secondary side input end of the optocoupler U3 is connected with a current-limiting resistor R1, the other end of the resistor R1 is connected with an input voltage VCC1, and the primary side output end of the optocoupler U3 is connected with a grounding end GND1; the output voltage of the optocoupler U3 is Vout1.
4. A relay fault detection circuit according to claim 1, wherein the relay coil control unit comprises a power device Q1; the collector of the power device Q1 is connected with the relay coil state detection unit and the relay; the emitter of the power device Q1 is connected with the ground end GND; the base electrode of the power device Q1 is connected with a current limiting resistor R5; the other end of the resistor R5 is connected with a relay fault detection unit.
5. A relay fault detection circuit according to claim 4, wherein the power device Q1 comprises a transistor, IGBT or MOSFET.
6. The relay fault detection circuit according to claim 1, wherein a freewheel diode D1 is connected in parallel to one side of the relay coil; the anode of the diode D1 is connected with the collector of the power device Q1; the cathode of the diode D1 is connected to the input voltage VCC 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222809534.1U CN219105102U (en) | 2022-10-24 | 2022-10-24 | Relay fault detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222809534.1U CN219105102U (en) | 2022-10-24 | 2022-10-24 | Relay fault detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219105102U true CN219105102U (en) | 2023-05-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222809534.1U Active CN219105102U (en) | 2022-10-24 | 2022-10-24 | Relay fault detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219105102U (en) |
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2022
- 2022-10-24 CN CN202222809534.1U patent/CN219105102U/en active Active
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