Relay control detection protection circuit and electronic equipment

Abstract

The utility model relates to the technical field of equipment detection, and provides a relay control detection protection circuit and electronic equipment, the device comprises a main relay unit, an auxiliary relay unit, a load unit, a detection unit and a control unit, the load unit, the main relay unit and the auxiliary relay unit are connected to form an electric power path; the detection unit is connected to the power path; the main relay unit, the auxiliary relay unit and the detection unit are all connected with the control unit; the detection unit is used for detecting a zero-crossing signal; and the control unit is used for disconnecting the auxiliary relay unit after receiving the zero-crossing signal detected by the detection unit when the auxiliary relay unit is switched on and the main relay unit is switched off. According to the invention, through detection of the zero-crossing signal, when the main relay unit which enables the load to work or stop working cannot be disconnected or has a fault, the auxiliary relay unit with a protection function can be used for disconnecting and ending the work of the load and protecting the load from being damaged, so that the safety of equipment is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment detection, in particular to a relay control detection protection circuit and electronic equipment. Background Art

[0002] Current electric heating appliances, such as rice cookers, electric pressure cookers, slow cookers, grills, steamers and other electronic products, generally use MCU to drive the relay to open and close, so as to achieve heating of the heating element. However, after the control relay is turned off, the relay may remain in the normally closed state, and the heating element will continue to heat, posing a safety hazard. In addition, if the relay body fails and is not controlled by the peripheral circuit, it will also cause the heating element to continue to heat the product, overheating, melting or catching fire, thus causing a safety accident. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a relay control detection protection circuit, which can detect the zero-crossing signal and, when the main relay unit that makes the load work or stop working cannot be disconnected or fails, can rely on the auxiliary relay unit with protection function to disconnect, end the load work, protect the load from damage, and thus protect the safety of the equipment.

[0004] According to the first aspect of the present utility model, the relay control detection protection circuit includes a main relay unit, an auxiliary relay unit, a load unit, a detection unit and a control unit, wherein:

[0005] The load unit, the main relay unit and the auxiliary relay unit are connected to form a power path; the detection unit is connected to the power path;

[0006] The main relay unit, the auxiliary relay unit, and the detection unit are all connected to the control unit;

[0007] The detection unit is used to detect the zero-crossing signal generated by the action of the power path and send it to the control unit;

[0008] The control unit is used for disconnecting the auxiliary relay unit after receiving the zero-crossing signal when the auxiliary relay unit is turned on and the control unit sends a disconnection instruction to the main relay unit.

[0009] According to the relay control detection protection circuit of the embodiment of the utility model, it is possible.

[0010] According to an embodiment of the utility model, the detection unit includes a first transistor, a first capacitor, a first diode, a first resistor, a second resistor, a second transistor and a second capacitor, wherein:

[0011] The base of the first transistor is connected to the auxiliary relay, the emitter of the first transistor is connected to AC-N, and the collector of the first transistor is connected to one end of the first resistor; the anode of the first diode is connected to the base of the first transistor, and the cathode of the first diode is connected to the emitter of the first transistor; one end of the first capacitor is connected to the base of the first transistor, and the other end of the first capacitor is connected to the emitter of the first transistor;

[0012] The other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to GND, the base of the second transistor is connected to the other end of the first resistor and one end of the second resistor, the other end of the second resistor is connected to the emitter of the second transistor and one end of the second capacitor, the collector of the second transistor is connected to the control unit, and the other end of the second capacitor is connected to the control unit.

[0013] According to an embodiment of the present utility model, the detection unit further includes a third resistor. Accordingly, one end of the third resistor is connected to the base of the first transistor, and the other end of the third resistor is connected to the auxiliary relay.

[0014] According to an embodiment of the utility model, the control unit is further configured to disconnect the auxiliary relay unit after determining that the detection unit has not detected a zero-crossing signal when the auxiliary relay unit is turned on and the main relay unit is turned on.

[0015] According to an embodiment of the present utility model, the main relay unit includes a main relay and a first drive module, the main relay is connected to the load unit, and the first drive module is connected to the main relay and the control unit respectively.

[0016] According to an embodiment of the utility model, the auxiliary relay unit includes an auxiliary relay and a second drive module, the auxiliary relay is connected to the load unit, and the second drive module is connected to the auxiliary relay and the control unit respectively.

[0017] According to one embodiment of the utility model, the protection circuit further includes an alarm unit, wherein:

[0018] The alarm unit is connected to the control unit and is used to receive the alarm signal sent by the control unit to perform an alarm action;

[0019] Correspondingly, the control unit is further used to send an alarm signal to the alarm unit after disconnecting the auxiliary relay unit.

[0020] According to one embodiment of the utility model, the protection circuit further includes a sending unit, wherein:

[0021] The sending unit is connected to the control unit and is used to receive the notification signal sent by the control unit to perform a notification action;

[0022] Correspondingly, the control unit is further used to send a notification signal to the sending unit after disconnecting the auxiliary relay unit.

[0023] According to an embodiment of the present invention, the load is a heating element configured in an electronic device.

[0024] An electronic device according to an embodiment of the second aspect of the utility model includes the above-mentioned relay control detection protection circuit.

[0025] The above one or more technical solutions in the embodiments of the utility model have at least one of the following technical effects:

[0026] Furthermore, by turning on the main and auxiliary relays, and the two transistors, the detection unit MCU can sense the zero-crossing signal in time, so as to facilitate the on-off control of the auxiliary relay in time.

[0027] Furthermore, an alarm can be sounded in time to alert the staff.

[0028] Furthermore, the situation can be promptly reported to the staff.

[0029] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 The structure diagram of the load fault detection device provided by the embodiment of the utility model is Figure 1 ;

[0032] Figure 2 The structure diagram of the load fault detection device provided by the embodiment of the utility model is Figure 2 . DETAILED DESCRIPTION

[0033] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0034] Current electric heating appliances, such as rice cookers, electric pressure cookers, slow cookers, grills, steamers and other electronic products, generally use MCU to drive the relay to open and close, so as to achieve heating of the heating element. However, after the control relay is turned off, the relay may remain in the normally closed state, and the heating element will continue to heat, posing a safety hazard. In addition, if the relay body fails and is not controlled by the peripheral circuit, it will also cause the heating element to continue to heat the product, overheating, melting or catching fire, thus causing a safety accident.

[0035] Therefore, the utility model needs to quickly detect that the relay has failed in a short time, so as to achieve a quick response and shut down the load.

[0036] thus, Figure 1 The schematic diagram of the structure of a relay control detection protection circuit provided by the utility model is illustrated. Figure 1 The relay control detection protection circuit includes a main relay unit 11, an auxiliary relay unit 12, a load unit 13, a detection unit 14 and a control unit 15, wherein:

[0037] The load unit, the main relay unit and the auxiliary relay unit are connected to form a power path; the detection unit is connected to the power path;

[0038] The main relay unit, the auxiliary relay unit, and the detection unit are all connected to the control unit;

[0039] The detection unit is used to detect the zero-crossing signal generated by the action of the power path and send it to the control unit;

[0040] The control unit is used to disconnect the auxiliary relay unit after receiving a zero-crossing signal when the auxiliary relay unit is turned on and the control unit sends a disconnection instruction to the main relay unit.

[0041] In this regard, it should be noted that in the present utility model, the operation and termination of the load are controlled by the on and off of the relay switch. Thus, the load unit may include a load and a power supply, and the load is connected to both ends of the power supply through wires, for example, one end of the load is connected to the AC live wire, and the other end is connected to the AC neutral wire. At this time, the main relay unit and the auxiliary relay unit are placed in the load unit, that is, the main relay unit and the auxiliary relay unit are connected to the wire connecting the load and the power supply to achieve the connection and disconnection of the wire, that is, the load unit, the main relay unit and the auxiliary relay unit are connected to form a power path. The power path is a closed-loop circuit. Under normal use, the main relay unit and the auxiliary relay unit are connected, and the load is running. The main relay unit is disconnected or the auxiliary relay unit is disconnected, and the load stops working.

[0042] In the present invention, although there are two relay units, the main purpose is to detect whether a certain relay unit (such as the main relay unit) is faulty, while the failure of the other relay unit can be protected by other means (such as temperature detection, etc.). From this point of view, the auxiliary relay unit is a protective relay, which can be in a normally closed state (only closed when the main relay unit fails). The main relay is a switch that controls the operation and termination of the load.

[0043] In the present invention, the detection unit is connected to the power path, and the detection unit is used to detect the zero-crossing signal generated by the power path. It should be noted that the detection unit detects whether the electric signal generated by the load unit, the main relay unit and the auxiliary relay unit generates a zero-crossing signal in the structure of the detection unit itself, so the detection unit can detect the zero-crossing signal.

[0044] The control unit is connected to the detection unit and can know whether the detection unit detects a zero-crossing signal. When the auxiliary relay unit is turned on and the control unit controls the main relay unit to disconnect, if the zero-crossing signal detected by the detection unit is received, it indicates that the main relay unit is stuck and the port is not completed. Therefore, the auxiliary relay unit needs to be disconnected to stop the operation of the load and protect the load from damage, thereby protecting the safety of the equipment.

[0045] Furthermore, when the auxiliary relay unit is turned on and the main relay unit is turned on, if the control unit does not receive the zero-crossing signal detected by the detection unit, it indicates that the load itself has a fault. At this time, the auxiliary relay unit also needs to be disconnected to stop the operation of the load and protect the load from damage, thereby protecting the safety of the equipment.

[0046] The relay control detection protection circuit provided by the utility model can, through the detection of the zero-crossing signal, rely on the auxiliary relay unit with protection function to disconnect when the main relay unit that makes the load work or stop working cannot be disconnected or fails itself, so as to end the load work and protect the load from damage, thereby protecting the safety of the equipment.

[0047] In the further circuit of the above relay control detection protection circuit, continue to see Figure 1 , the detection unit 14 includes a first transistor Q1, a first capacitor C1, a first diode D1, a first resistor R1, a second resistor R2, a second transistor Q2 and a second capacitor C2, wherein:

[0048] The base B of the first transistor Q1 is connected to the auxiliary relay unit, the emitter E of the first transistor Q1 is connected to AC-N, and the collector C of the first transistor Q1 is connected to one end of the first resistor R1; the anode of the first diode D1 is connected to the base B of the first transistor Q1, and the cathode of the first diode D1 is connected to the emitter E of the first transistor Q1; one end of the first capacitor C1 is connected to the base B of the first transistor Q1, and the other end of the first capacitor C1 is connected to the emitter E of the first transistor Q1.

[0049] The other end of the first resistor R1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to GND, the base B of the second transistor Q2 is connected to the other end of the first resistor R1 and one end of the second resistor R2, the other end of the second resistor R2 is connected to the emitter E of the second transistor Q2 and one end of the second capacitor C2, the collector C of the second transistor Q2 is connected to the control unit MCU, and the other end of the second capacitor C2 is connected to the control unit MCU.

[0050] Furthermore, the detection unit 14 further includes a third resistor R3. Accordingly, one end of the third resistor R3 is connected to the base B of the first transistor Q1, and the other end of the third resistor R3 is connected to the auxiliary relay unit.

[0051] Furthermore, the main relay unit 11 includes a main relay K1 and a first driving module. The main relay K1 is connected to the load unit, and the first driving module is connected to the main relay K1 and the control unit respectively.

[0052] Furthermore, the auxiliary relay unit 12 includes an auxiliary relay K2 and a second driving module. The auxiliary relay K2 is connected to the load unit, and the second driving module is connected to the auxiliary relay K2 and the control unit respectively.

[0053] One end of the main relay K1 is connected to the AC live wire AC-L, and the other end is connected to one end of the load. One end of the auxiliary relay K2 is connected to the AC neutral wire AC-N, and the other end is connected to the other end of the load.

[0054] For the above circuit structure, we must first explain the principle of zero-crossing signal detection: when the auxiliary relay K2 and the main relay K1 are turned on at the same time, the AC live line AC-L is less than the AC neutral line AC-N, the first transistor Q1 is turned on, and the first resistor R1 and the second resistor R2 divide the AC neutral line AC-N, so that the second transistor Q2 is turned on, thereby generating a zero-crossing signal to the control unit MCU.

[0055] When the auxiliary relay K2 is turned on and the main relay K1 is turned off, if the detection unit MCU cannot detect the zero-crossing signal at this time, it is judged that the main relay K1 is not sticky and the main relay K1 is normal. If the detection unit MCU detects the zero-crossing signal, it is judged that the main relay K1 is sticky and the main relay K1 is abnormal. At this time, the auxiliary relay K2 is turned off to protect the equipment.

[0056] When the auxiliary relay K2 is turned on and the main relay K1 is turned on, if the detection unit MCU detects a zero-crossing signal at this time, it is determined that the main relay K1 is normally turned on and the main relay K1 is normal. If the detection unit MCU cannot detect a zero-crossing signal, it is determined that the main relay K1 cannot be turned on and the main relay K1 is abnormal. At this time, the auxiliary relay K2 is turned off to protect the equipment.

[0057] The utility model further provides a relay control detection protection circuit, which enables the detection unit MCU to timely sense the zero-crossing signal through the conduction of the main and auxiliary relays and the conduction of the two transistors, so as to facilitate timely on-off control of the auxiliary relays.

[0058] The utility model further provides a relay control detection protection circuit. When the main relay fails or cannot be disconnected, an alarm needs to be issued in time to alert the staff. Figure 2 The relay control detection protection circuit includes a main relay unit 11, an auxiliary relay unit 12, a load unit 13, a detection unit 14 and a control unit 15, wherein:

[0059] The load unit, the main relay unit and the auxiliary relay unit are connected to form a power path; the detection unit is connected to the power path;

[0060] The main relay unit, the auxiliary relay unit, and the detection unit are all connected to the control unit;

[0061] The detection unit is used to detect the zero-crossing signal generated by the action of the power path and send it to the control unit;

[0062] The control unit is used to disconnect the auxiliary relay unit after receiving a zero-crossing signal when the auxiliary relay unit is turned on and the main relay unit is turned off.

[0063] The power path is a closed-loop circuit. Under normal use, the main relay unit and the auxiliary relay unit are connected, and the load operates. The main relay unit or the auxiliary relay unit is disconnected, and the load stops operating.

[0064] In the present invention, although there are two relay units, the main purpose is to detect whether a certain relay unit (such as the main relay unit) is faulty, while the failure of the other relay unit can be protected by other means (such as temperature detection, etc.). From this point of view, the auxiliary relay unit is a protective relay, which can be in a normally closed state (only closed when the main relay unit fails). The main relay is a switch that controls the operation and termination of the load.

[0065] The control unit is connected to the detection unit and can know whether the detection unit detects a zero-crossing signal. When the auxiliary relay unit is turned on and the control unit controls the main relay unit to disconnect, if the zero-crossing signal detected by the detection unit is received, it indicates that the main relay unit is stuck and the port is not completed. Therefore, the auxiliary relay unit needs to be disconnected to stop the operation of the load and protect the load from damage, thereby protecting the safety of the equipment.

[0066] When the main relay fails or cannot be disconnected, an alarm needs to be issued in time to alert the staff. Therefore, the relay control detection protection circuit also includes an alarm unit 16, wherein:

[0067] The alarm unit is connected to the control unit and is used to receive the alarm signal sent by the control unit and execute the alarm action;

[0068] Correspondingly, the control unit is also used to send an alarm signal to the alarm unit after disconnecting the auxiliary relay unit.

[0069] The alarm unit may adopt an indicator light or a loudspeaker.

[0070] The utility model further controls the relay to detect the protection circuit. When the relay fails or cannot be disconnected, if the staff is not on site, the situation needs to be promptly informed to the staff. Figure 2 The relay control detection protection circuit includes a main relay unit 11, an auxiliary relay unit 12, a load unit 13, a detection unit 14 and a control unit 15, wherein:

[0071] The load unit, the main relay unit and the auxiliary relay unit are connected to form a power path; the detection unit is connected to the power path;

[0072] The main relay unit, the auxiliary relay unit, and the detection unit are all connected to the control unit;

[0073] The detection unit is used to detect the zero-crossing signal generated by the action of the power path and send it to the control unit;

[0074] The control unit is used to disconnect the auxiliary relay unit after receiving the zero-crossing signal detected by the detection unit when the auxiliary relay unit is turned on and the main relay unit is turned off.

[0075] The power path is a closed-loop circuit. Under normal use, the main relay unit and the auxiliary relay unit are connected, and the load operates. The main relay unit or the auxiliary relay unit is disconnected, and the load stops operating.

[0076] In the present invention, although there are two relay units, the main purpose is to detect whether a certain relay unit (such as the main relay unit) is faulty, while the failure of the other relay unit can be protected by other means (such as temperature detection, etc.). From this point of view, the auxiliary relay unit is a protective relay, which can be in a normally closed state (only closed when the main relay unit fails). The main relay is a switch that controls the operation and termination of the load.

[0077] The control unit is connected to the detection unit and can know whether the detection unit detects a zero-crossing signal. When the auxiliary relay unit is turned on and the control unit controls the main relay unit to disconnect, if the zero-crossing signal detected by the detection unit is received, it indicates that the main relay unit is stuck and the port is not completed. Therefore, the auxiliary relay unit needs to be disconnected to stop the operation of the load and protect the load from damage, thereby protecting the safety of the equipment.

[0078] For this purpose, the relay control detection protection circuit also includes an alarm unit 16, wherein:

[0079] The alarm unit is connected to the control unit and is used to receive the alarm signal sent by the control unit and execute the alarm action;

[0080] Correspondingly, the control unit is also used to send an alarm signal to the alarm unit after disconnecting the auxiliary relay unit.

[0081] The alarm unit may adopt an indicator light or a loudspeaker.

[0082] To this end, the relay control detection protection circuit also includes a sending unit 17, wherein:

[0083] The sending unit is connected to the control unit and is used to receive the notification signal sent by the control unit to perform the notification action;

[0084] Correspondingly, the control unit is further used to send a notification signal to the sending unit after disconnecting the auxiliary relay unit.

[0085] In the present invention, the sending unit may adopt a wireless sending method, such as sending the notification signal to the mobile terminal of the staff member by wireless sending method.

[0086] The utility model also provides an electronic device, including the above-mentioned relay control detection protection circuit. The relay control detection protection circuit in the electronic device can play a certain protection function on the protection device. For example, the electronic device is an electronic product such as an electric rice cooker, an electric pressure cooker, a slow cooker, a frying machine, a steamer, etc., and the load is a heating element configured in the electronic device.

[0087] Based on the above explanation of the principle of the relay control detection protection circuit, the processing of the load fault detection device applied to the electronic device will not be described in detail here.

[0088] The electronic device provided by the utility model can detect the zero-crossing signal and, when the main relay unit that makes the load work or stop working cannot be disconnected or fails itself, can rely on the auxiliary relay unit with a protection function to disconnect and end the load work, protect the load from damage, and further protect the safety of the equipment.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A relay control detection protection circuit, characterized in that: It includes a main relay unit, an auxiliary relay unit, a load unit, a detection unit and a control unit, wherein: The load unit, the main relay unit and the auxiliary relay unit are connected to form a power path; the detection unit is connected to the power path; The main relay unit, the auxiliary relay unit, and the detection unit are all connected to the control unit; The detection unit is used to detect the zero-crossing signal generated by the action of the power path and send it to the control unit; The control unit is used for disconnecting the auxiliary relay unit after receiving the zero-crossing signal when the auxiliary relay unit is turned on and the control unit sends a disconnection instruction to the main relay unit.

2. The relay control detection protection circuit according to claim 1, characterized in that: The detection unit includes a first transistor, a first capacitor, a first diode, a first resistor, a second resistor, a second transistor and a second capacitor, wherein: The base of the first transistor is connected to the auxiliary relay unit, the emitter of the first transistor is connected to AC-N, and the collector of the first transistor is connected to one end of the first resistor; the anode of the first diode is connected to the base of the first transistor, and the cathode of the first diode is connected to the emitter of the first transistor; one end of the first capacitor is connected to the base of the first transistor, and the other end of the first capacitor is connected to the emitter of the first transistor; The other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to GND, the base of the second transistor is connected to the other end of the first resistor and one end of the second resistor, the other end of the second resistor is connected to the emitter of the second transistor and one end of the second capacitor, the collector of the second transistor is connected to the control unit, and the other end of the second capacitor is connected to the control unit.

3. The relay control detection protection circuit according to claim 2, characterized in that: The detection unit further includes a third resistor. Accordingly, one end of the third resistor is connected to the base of the first transistor, and the other end of the third resistor is connected to the auxiliary relay unit.

4. The relay control detection protection circuit according to claim 1, characterized in that: The control unit is further configured to disconnect the auxiliary relay unit after determining that the detection unit has not detected a zero-crossing signal when the auxiliary relay unit is turned on and the main relay unit is turned on.

5. The relay control detection protection circuit according to claim 1, characterized in that: The main relay unit includes a main relay and a first drive module. The main relay is connected to the load unit. The first drive module is connected to the main relay and the control unit respectively.

6. The relay control detection protection circuit according to claim 1, characterized in that: The auxiliary relay unit includes an auxiliary relay and a second driving module. The auxiliary relay is connected to the load unit, and the second driving module is connected to the auxiliary relay and the control unit respectively.

7. The relay control detection protection circuit according to claim 2, characterized in that: The protection circuit also includes an alarm unit, wherein: The alarm unit is connected to the control unit and is used to receive the alarm signal sent by the control unit to perform an alarm action; Correspondingly, the control unit is further used to send an alarm signal to the alarm unit after disconnecting the auxiliary relay unit.

8. The relay control detection protection circuit according to claim 7, characterized in that: The protection circuit further includes a sending unit, wherein: The sending unit is connected to the control unit and is used to receive the notification signal sent by the control unit to perform a notification action; Correspondingly, the control unit is further used to send a notification signal to the sending unit after disconnecting the auxiliary relay unit.

9. The relay control detection protection circuit according to any one of claims 1 to 8, characterized in that: The load is a heating element configured in the electronic device.

10. An electronic device, characterized in that: The invention comprises the relay control detection protection circuit as described in any one of claims 1 to 9.

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