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CN-121983465-A - Control circuit, detection circuit, adhesion detection method and circuit topology structure of relay

CN121983465ACN 121983465 ACN121983465 ACN 121983465ACN-121983465-A

Abstract

The embodiment of the disclosure provides a control circuit, a detection circuit, an adhesion detection method and a circuit topology structure of a relay. The detection circuit comprises a sixth resistor, a seventh resistor, a detection module and an output end, wherein the two ends of the sixth resistor are respectively coupled with a third node and a second reference ground, the two ends of the seventh resistor are respectively coupled with a fourth power supply end and a fourth node, the fourth node is used for being coupled with a normally-closed contact, the detection module is configured to enable the fifth node to be conducted with the third reference ground under the control of a first control signal of the fourth node under the condition that a common contact is coupled with the normally-open contact, the output end outputs a first detection signal, and the output end is also configured to enable the fifth node to be disconnected with the third reference ground under the control of a second control signal of the fourth node under the condition that the common contact is coupled with the normally-closed contact, and the second detection signal is different from the first detection signal. By the detection circuit, whether the relay is adhered or not can be detected.

Inventors

  • ZHANG ZHONG
  • LI SHAOJIAN
  • YU YANG
  • XU JIAXIN
  • YANG ZHENQIANG

Assignees

  • 珠海格力电器股份有限公司

Dates

Publication Date
20260505
Application Date
20251226

Claims (17)

  1. 1. A control circuit for a relay, the relay comprising a coil, a common contact for coupling with a third power supply terminal, a normally closed contact for coupling with a load, and a normally open contact, the control circuit comprising: The charging and discharging module is provided with a first end and a second end, the first end of the charging and discharging module is coupled with a first node, the first node is coupled with a first power end, and the second end of the charging and discharging module is used for being coupled with one end of a coil of the relay; the first driving module is respectively coupled with a driving control end, the first node and a second node, the second node is coupled with a first reference ground, and the second node is also coupled with the other end of the coil of the relay; Under the condition that the drive control end provides a turn-off signal, the first drive module is controlled by the turn-off signal to disconnect the first node from the second node, the coil is powered off, the common contact is coupled with the normally closed contact, and the first power end charges the charge-discharge module; Under the condition that the driving control end provides a pulse width modulation signal, the first driving module is configured to enable the first node and the second node to be circularly switched in a connection state and a disconnection state under the control of the pulse width modulation signal, so that the common contact is coupled with the normally open contact; In a state that the first node is conducted with the second node, the charge-discharge module discharges electricity through the first node, the second node and the coil; and in a state that the first node is disconnected from the second node, the first power supply terminal charges the charge and discharge module.
  2. 2. The control circuit of claim 1, wherein the charge-discharge module comprises a first capacitor having a first pole coupled to the first node and a second pole coupled to one end of a coil of the relay.
  3. 3. The control circuit of claim 1, wherein the first drive module comprises a first switching device having a control electrode coupled to the drive control terminal, the first and second electrodes of the first switching device being coupled to the first and second nodes, respectively.
  4. 4. The control circuit of claim 3, wherein the first switching device comprises a first triode or a first MOS transistor; The base electrode of the first triode is coupled with the driving control end, the collector electrode of the first triode is coupled with the first node, and the emitter electrode of the first triode is coupled with the second node; The grid electrode of the first MOS tube is coupled with the driving control end, one of the source electrode and the drain electrode of the first MOS tube is coupled with the first node, and the other is coupled with the second node.
  5. 5. The control circuit according to claim 1, further comprising a first diode and/or a second diode, wherein a positive electrode of the first diode is coupled to the second terminal of the charge-discharge module, a negative electrode of the first diode is coupled to the second node, a positive electrode of the second diode is coupled to the second terminal of the charge-discharge module, and a negative electrode of the second diode is coupled to the second node.
  6. 6. The control circuit of any one of claims 1-5, further comprising a second resistor, a third resistor, a fourth resistor, and a fifth resistor; the first end of the second resistor is coupled with the first power end, the second end of the second resistor is coupled with the first end of the third resistor, and the second end of the third resistor is coupled with the first node; The first end of the fourth resistor is coupled with the first power supply end, the second end of the fourth resistor is coupled with the first end of the fifth resistor, and the second end of the fifth resistor is coupled with the first node; a second end of the second resistor is coupled to a second end of the fourth resistor.
  7. 7. A detection circuit of a relay is characterized in that, The relay comprises a coil, a common contact, a normally closed contact and a normally open contact, wherein the common contact is coupled with a third node, the third node is used for being coupled with a third power supply end, and the normally open contact is used for being coupled with a load; the detection circuit includes: a sixth resistor and a seventh resistor, wherein two ends of the sixth resistor are respectively coupled with the third node and the second reference ground, two ends of the seventh resistor are respectively coupled with a fourth power supply end and a fourth node, and the fourth node is used for being coupled with the normally-closed contact; the detection module is respectively coupled with the fourth node, a fifth node and a third reference ground, the fifth node is coupled with the second power supply end, and the fifth node is also coupled with the output end; the detection module is configured to enable the fifth node to be conducted with the third reference ground under the control of a first control signal of the fourth node under the condition that the common contact is coupled with the normally open contact, and the output end outputs a first detection signal; the detection module is further configured to disconnect the fifth node from the third reference ground under control of a second control signal of the fourth node in case the common contact is coupled with the normally closed contact, the output terminal outputting a second detection signal, the second detection signal being different from the first detection signal.
  8. 8. The detection circuit of claim 7, wherein the detection module comprises a voltage regulator and a second switching device, the positive electrode of the voltage regulator being coupled to the fourth node, the control electrode of the second switching device being coupled to the negative electrode of the voltage regulator, the first and second electrodes of the second switching device being coupled to the fifth node and the third reference ground, respectively; The voltage stabilizing tube is configured to be turned on when the fourth node provides the first control signal and turned off when the fourth node provides the second control signal; the second switching device is configured to cause the fifth node to be turned on with the third reference ground when the regulator tube is turned on, and to cause the fifth node to be turned off with the third reference ground when the regulator tube is turned off.
  9. 9. The detection circuit of claim 8, wherein the second switching device comprises a second triode or a second MOS transistor; the base electrode of the second triode is coupled with the negative electrode of the voltage stabilizing tube, the collector electrode of the second triode is coupled with the fifth node, and the emitter electrode of the second triode is coupled with the third reference ground; the grid electrode of the second MOS tube is coupled with the negative electrode of the voltage stabilizing tube, one of the source electrode and the drain electrode of the second MOS tube is coupled with the fifth node, and the other is coupled with the third reference ground.
  10. 10. The detection circuit of claim 7, further comprising at least one of: a ninth resistor is arranged between the fifth node and the second power supply end; a tenth resistor is arranged between the fifth node and the output end; A second capacitor is arranged between the output end and the third reference ground; A third diode is arranged between the fourth node and the normally-closed contact, the positive electrode of the third diode is coupled with the fourth node, and the negative electrode of the third diode is coupled with the normally-closed contact; A fourth diode is arranged between the fourth node and the detection module, the positive electrode of the fourth diode is coupled with the fourth node, and the negative electrode of the fourth diode is coupled with the detection module.
  11. 11. The detection circuit of claim 7, wherein the fourth power supply terminal is configured to provide an ac voltage signal.
  12. 12. The detection circuit of claim 7, wherein the detection circuit comprises a logic circuit, The third power supply terminal is configured to provide a preset voltage under the instruction of coupling the common contact and the normally open contact; The third power supply terminal is further configured to be placed in a floating state upon an instruction that the common contact is reset to be coupled to the normally-closed contact.
  13. 13. The detection circuit of claim 7, wherein the third node and the third power supply terminal are provided with a sixth diode, an anode of the sixth diode is coupled to the third power supply terminal, and a cathode of the sixth diode is coupled to the third node.
  14. 14. The detection circuit according to any one of claims 7-13, wherein both ends of the coil are coupled to a drive control terminal through a preset control circuit; under the control of the preset control circuit, the coil is powered off under the condition that the drive control end provides a turn-off signal, and the common contact is coupled with the normally closed contact; And under the control of the preset control circuit, the coil is electrified under the condition that the drive control terminal provides an opening signal, and the common contact is coupled with the normally open contact.
  15. 15. The detection circuit of claim 14, wherein the preset control circuit comprises the control circuit of any one of claims 1-6.
  16. 16. A method for detecting adhesion of a relay, applied to the detection circuit of any one of claims 14 to 15, the method comprising: Providing an opening signal to the drive control end, receiving a detection signal output by an output end of the detection circuit, judging that the common contact is successfully switched if the output end outputs a first detection signal, judging that the relay is adhered if the output end outputs a second detection signal, and controlling the common contact to be coupled with the normally open contact by the opening signal; And providing a turn-off signal to the drive control end, receiving a detection signal output by the output end of the detection circuit, judging that the common contact is successfully switched if the output end outputs a second detection signal, judging that the relay is adhered if the output end outputs a first detection signal, and controlling the common contact to be coupled with the normally closed contact by the turn-off signal.
  17. 17. A circuit topology of a relay, comprising the control circuit of any one of claims 1-6, and further comprising the detection circuit of any one of claims 7-13.

Description

Control circuit, detection circuit, adhesion detection method and circuit topology structure of relay Technical Field The disclosure relates to the technical field of relay control and detection, in particular to a control circuit, a detection circuit, an adhesion detection method and a circuit topology structure of a relay. Background In industrial automation and power control systems, relays are used as key switching elements in a wide variety of control circuits. Conventional relay control circuits generally control the actuation and release of a relay only by a control signal, and lack a real-time detection mechanism for the actual working state (e.g., on, off, adhesion) of the relay. When the relay has adhesion fault, the system can not identify and take protective measures in time, which may cause malfunction of equipment, abnormal load operation and even cause safety accidents. In addition, the existing relay control circuit lacks enough fault tolerant design, which easily causes the system to be in an unsafe state and affects the stability and the safety of the whole system. Disclosure of Invention The embodiment of the disclosure provides a control circuit, a detection circuit, an adhesion detection method and a circuit topology structure of a relay, which are used for solving or relieving one or more technical problems in the prior art. As a first aspect of the disclosed embodiments, the disclosed embodiments provide a control circuit of a relay including a coil, a common contact for coupling with a third power supply terminal, a normally closed contact for coupling with a load, and a normally open contact, the control circuit comprising: The charging and discharging module is provided with a first end and a second end, the first end of the charging and discharging module is coupled with a first node, the first node is coupled with a first power end, and the second end of the charging and discharging module is used for being coupled with one end of a coil of the relay; The first driving module is respectively coupled with the driving control end, a first node and a second node, the second node is coupled with a first reference ground, and the second node is also coupled with the other end of the coil of the relay; Under the condition that the drive control end provides a turn-off signal, the first drive module enables the first node to be disconnected from the second node under the control of the turn-off signal, the coil is powered off, the common contact is coupled with the normally closed contact, and the first power end charges the charge and discharge module; under the condition that a driving control end provides a pulse width modulation signal, the first driving module is configured to enable the first node and the second node to be circularly switched in a connection state and a disconnection state under the control of the pulse width modulation signal, so that the common contact is coupled with the normally open contact; the charging and discharging module discharges electricity through the first node, the second node and the coil in a state that the first node is conducted with the second node, and the first power supply terminal charges the charging and discharging module in a state that the first node is disconnected with the second node. In some embodiments, the charge-discharge module includes a first capacitor having a first pole coupled to the first node and a second pole coupled to one end of the coil of the relay. In some embodiments, the first driving module includes a first switching device having a control electrode coupled to the driving control terminal, and a first electrode and a second electrode coupled to the first node and the second node, respectively. In some embodiments, the first switching device comprises a first triode or a first MOS transistor; The base electrode of the first triode is coupled with the driving control end, the collector electrode of the first triode is coupled with the first node, and the emitter electrode of the first triode is coupled with the second node; The grid electrode of the first MOS tube is coupled with the drive control end, one of the source electrode and the drain electrode of the first MOS tube is coupled with the first node, and the other is coupled with the second node. In some embodiments, the battery pack further comprises a first diode and/or a second diode, wherein the positive electrode of the first diode is coupled with the second end of the charge-discharge module, the negative electrode of the first diode is coupled with the second node, the positive electrode of the second diode is coupled with the second end of the charge-discharge module, and the negative electrode of the second diode is coupled with the second node. In some embodiments, the circuit further comprises a second resistor, a third resistor, a fourth resistor, and a fifth resistor; The first end of the second resistor is coupled with the first power end, th