Starting circuit and household appliance

Abstract

The utility model relates to a starting circuit and a household electrical appliance, the starting circuit comprises a button circuit, a switch circuit, a first relay circuit, a second relay circuit and a controller, when the button circuit is in an on state, the controller controls the switch circuit to be in an on state according to a received first level signal, and the second relay circuit is in an off state according to a received second level signal. The first power supply supplies power to the coil of the first relay circuit, so that the first power supply is connected with the coil of the second relay circuit, the working loop of the second relay circuit is established, the contact group of the second relay circuit is closed, and the load of the household appliance is electrified and started. Therefore, according to the starting circuit, the key circuit is connected in series in the working loop of the first relay circuit, and only when the key circuit is in an on state, the working loop of the first relay circuit and the second relay circuit can be established, so that the household appliance can be started, the false starting operation is prevented, and the reliable standby of the household appliance is ensured.

Description

Technical Field

[0001] The utility model relates to the field of household appliances, in particular to a starting circuit and a household appliance. Background Art

[0002] In the control technology of small household appliances, the requirements for product standby safety are getting higher and higher. Generally, the controller detects the on and off of the start / stop button, and then outputs the corresponding control signal to control the start of the household appliance. In the standby state, if the controller runs away or crashes due to some circumstances, or there is a false detection, the button is not pressed, and the controller still outputs a control signal to start the household appliance, resulting in the problem of false startup, making the standby state of the household appliance extremely unsafe. Utility Model Content

[0003] The embodiment of the utility model aims to provide a starting circuit and a household appliance, which can prevent erroneous starting operation and achieve reliable standby.

[0004] In order to solve the above technical problems, the present utility model provides the following technical solutions:

[0005] In a first aspect, an embodiment of the utility model provides a starting circuit, which is applied to a household appliance, and the starting circuit includes: a key circuit, a switch circuit, a first relay circuit, a second relay circuit and a controller;

[0006] The first end of the key circuit is connected to the first power supply, the second end of the key circuit is connected to the input end of the controller, and the third end of the key circuit is connected to the first coil end of the first relay circuit. When the key circuit is in a conductive state, the key circuit is used to send a first level signal to the controller and control the first power supply to establish a connection with the coil of the first relay circuit.

[0007] The control end of the switch circuit is connected to the output end of the controller, the first end of the switch circuit is connected to the second coil end of the first relay circuit, and the controller is used to control the switch circuit to be in a conductive state according to the first level signal, so that the first power supply supplies power to the coil of the first relay circuit;

[0008] The contact group of the first relay circuit is respectively connected to the first power supply and the first coil end of the second relay circuit, the second coil end of the second relay circuit is grounded, and the contact group of the second relay circuit is connected to the load of the household appliance;

[0009] The first relay circuit is used to control the first power supply to establish a connection with the coil of the second relay circuit when its coil is energized, so that the coil of the second relay circuit is energized, the contact group of the second relay is closed, and then the load of the household appliance is powered on and started.

[0010] In some embodiments, the key circuit includes a key and a voltage division module;

[0011] One end of the button is connected to the first power supply, the other end of the button is respectively connected to the first coil end of the first relay circuit and one end of the voltage divider module, and the other end of the voltage divider module is connected to the input end of the controller;

[0012] The voltage division module is used for dividing the voltage of the first power supply to generate the first level signal when the key is pressed.

[0013] In some embodiments, the voltage divider module includes a first resistor, a second resistor, a first diode, and a first capacitor;

[0014] One end of the first resistor is respectively connected to the button and the first coil end of the first relay circuit, the other end of the first resistor is respectively connected to one end of the second resistor, the anode of the first diode, one end of the first capacitor and the input end of the controller, and the other end of the second resistor and the other end of the first capacitor are grounded together.

[0015] In some embodiments, the switch circuit includes a first transistor, a third resistor, and a fourth resistor;

[0016] The base of the first transistor is respectively connected to one end of the third resistor and one end of the fourth resistor, the other end of the third resistor is connected to the output end of the controller, the other end of the fourth resistor and the emitter of the first transistor are grounded together, and the collector of the first transistor is connected to the second coil end of the first relay circuit.

[0017] In some embodiments, the first relay circuit includes a first relay and a first unidirectional conduction module, and the second relay circuit includes a second relay and a second unidirectional conduction module;

[0018] The contact group of the first relay is respectively connected to the first power supply, one end of the second one-way conduction module and one end of the second relay, one end of the coil of the first relay is respectively connected to one end of the second one-way conduction module and one end of the first one-way conduction module, and the other end of the first one-way conduction module is connected to the second end of the key circuit;

[0019] The other end of the coil of the first relay is connected to the first end of the switch circuit, the other end of the coil of the second relay is grounded, and the contact group of the second relay is connected to the load of the household appliance;

[0020] When the button circuit is in a conducting state, the first relay is used to control the first power supply to supply power to the coil of the second relay, the second unidirectional conduction module is used to generate a freewheeling current according to the first power supply, and to conduct the freewheeling current to the coil of the first relay through the freewheeling current, and the first unidirectional conduction module is used to prevent the freewheeling current from flowing to the controller.

[0021] In some embodiments, the first unidirectional conduction module includes a second diode, and the second unidirectional conduction module includes a third diode;

[0022] The anode of the second diode is connected to the second end of the key circuit, the cathode of the second diode is respectively connected to the cathode of the third diode and the coil of the first relay, and the anode of the third diode is respectively connected to the contact group of the first relay and the coil of the second relay.

[0023] In a second aspect, an embodiment of the present invention provides a household appliance, which includes a load and the starting circuit as described above.

[0024] In various embodiments of the utility model, the starting circuit includes a key circuit, a switch circuit, a first relay circuit, a second relay circuit and a controller, wherein when the key circuit is in a conducting state, the key circuit sends a first level signal to the controller, and also controls the first power supply to establish a connection with the coil of the first relay circuit. At the same time, the controller controls the switch circuit to be in a conducting state according to the first level signal, thereby establishing a working circuit of the first relay circuit, the first power supply supplies power to the coil of the first relay circuit, the contact group of the first relay circuit is closed, the first power supply is connected to the coil of the second relay circuit, and the working circuit of the second relay circuit is established, so that the first power supply supplies power to the coil of the second relay circuit, the contact group of the second relay circuit is closed, and the load of the household appliance is powered on and started.

[0025] Therefore, if the key circuit is in an open state, even if the controller controls the switch circuit to be in a closed state due to external factors, the working circuit of the first relay circuit cannot be established, the coil of the first relay circuit cannot be energized, and the working circuit of the second relay circuit cannot be established, and the household appliance cannot be powered on and started. Only when the key circuit is in a closed state can the working circuits of the first relay circuit and the second relay circuit be established, and the household appliance can be powered on and started. Therefore, the starting circuit connects the key circuit in series with the working circuit of the first relay circuit, which can prevent accidental starting operations, ensure reliable standby of household appliances, and improve safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0027] Figure 1 It is a structural schematic diagram of a household appliance provided by an embodiment of the utility model;

[0028] Figure 2 It is a structural schematic diagram of a starting circuit provided by an embodiment of the utility model;

[0029] Figure 3 It is a structural schematic diagram of a starting circuit provided by an embodiment of the utility model;

[0030] Figure 4 It is a circuit structure schematic diagram of a starting circuit provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0032] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of a household appliance provided by an embodiment of the utility model. Figure 1As shown, the household appliance 100 includes a start-up circuit 10 and a load 20. The start-up circuit 10 includes a controller. The controller outputs a corresponding control signal by detecting the state of a button. If it is detected that the button is pressed, the controller outputs a corresponding control signal to control the load 20 to be powered on to start the household appliance. If it is detected that the button is pressed again, the controller outputs a corresponding control signal to control the load 20 to be powered off, so that the household appliance stops working and is in a standby state. When the household appliance 100 is in standby mode, the controller still detects the state of the button to start the household appliance 100. If the controller has a program runaway or crash due to some circumstances, the detection of the button fails, and even if the button is not pressed, the controller still outputs a control signal to start the household appliance 100, resulting in a problem of misstarting, making the standby state of the household appliance 100 extremely unsafe.

[0033] Therefore, an embodiment of the utility model provides a starting circuit, which can enable a household appliance to enter standby mode reliably and improve standby safety.

[0034] Specifically, see Figure 2 , Figure 2 : is a schematic diagram of a starting circuit provided by an embodiment of the utility model, such as Figure 2 As shown, the start-up circuit 10 includes a key circuit 11, a switch circuit 12, a first relay circuit 13, a second relay circuit 14 and a controller 15, wherein a first end of the key circuit 11 is connected to a first power source 200, a second end of the key circuit 11 is connected to an input end of the controller 15, and a third end of the key circuit 11 is connected to a first coil end of the first relay circuit 13. A control end of the switch circuit 12 is connected to an output end of the controller 15, a first end of the switch circuit 12 is connected to a second coil end of the first relay circuit 13, a contact group of the first relay circuit 13 is connected to the first power source 200 and the first coil end of the second relay circuit 14, respectively, a second coil end of the second relay circuit 14 is grounded, and a contact group of the second relay circuit 14 is connected to a load of a household appliance.

[0035] The key circuit 11 includes a key. When the key is pressed, the key circuit 11 is in a connected state. After the key is pressed, it will automatically pop up and the key circuit 11 is in a disconnected state.

[0036] When the key circuit 11 is in the on state, for example, the key is pressed, the key circuit 11 sends a first level signal to the input end of the controller 15. The controller 15 receives the first level signal and outputs a control signal through its output end to control the switch circuit 12 to be in the on state. In addition, the first power supply 200 is connected to the coil of the first relay circuit 13 via the key circuit 11, and the switch circuit 12 is in a conductive state, thereby forming a closed loop of the first power supply 200—key circuit 11—first relay circuit 13—switch circuit 12, that is, the working loop of the first relay circuit 13 is established, the first power supply 200 supplies power to the coil of the first relay circuit 13, and the contact group of the first relay circuit 13 is closed, so that the first power supply 200 is connected to the coil of the second relay circuit 14, thereby forming a working loop of the first power supply 200—contact group of the first relay circuit 13—coil of the second relay circuit 14, that is, the working loop of the second relay circuit 14 is established, the first power supply 200 supplies power to the coil of the second relay circuit 14, and the contact group of the second relay circuit 14 is closed, and then the load of the household appliance is powered on and started.

[0037] When the key circuit 11 is in the on state again, that is, the key in the key circuit 11 is pressed again, the input end of the controller 15 receives the first level signal again, and then outputs the corresponding control signal through its output end to control the switch circuit 12 to be in the off state, disconnect the working circuit of the first relay circuit 13, and then disconnect the working circuit of the second relay circuit 14, so that the household appliance stops working and is in standby state.

[0038] In the standby state, if the key circuit 11 is not in the on state, even if the controller 15 misjudges that the key in the key circuit 11 is pressed due to external factors (the program runs away or freezes, or the key is mistakenly detected to be pressed), and outputs a control signal to control the switch circuit 12 to be in the on state, the working circuit of the first relay circuit 13 cannot be established, the coil of the first relay circuit 13 cannot be energized, and the working circuit of the second relay circuit 14 cannot be established, and the household appliance cannot be powered on. Only when the key circuit 11 is in the on state, the first power supply 200 will supply power to the coil of the first relay circuit 13, the working circuits of the first relay circuit 13 and the second relay circuit 14 can be established, and the household appliance can be powered on.

[0039] In some embodiments, the first power source 200 may be provided by a suitable independent power source, or may be generated by an external power source through voltage reduction, rectification, voltage stabilization, filtering and other processes.

[0040] The controller 15 may also be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), a single chip microcomputer, an ARM (Acorn RISC Machine) or other programmable logic device, a discrete gate or transistor logic, a discrete hardware component, or any combination of these components. In addition, the controller 15 may also be any conventional processor, controller, microcontroller, or state machine. The controller 15 may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in combination with a DSP, and / or any other such configuration.

[0041] To sum up, the starting circuit connects the key circuit in series with the working circuit of the first relay circuit, so that only when the key circuit is in a conductive state, the working circuit of the first relay circuit and the second relay circuit will be established, and the household appliance can be started, thereby preventing accidental starting operations, ensuring reliable standby of the household appliance, and improving safety.

[0042] See also Figure 3 , Figure 3 : is a schematic diagram of a starting circuit provided by an embodiment of the utility model, such as Figure 3 As shown, the key circuit 11 includes a key SW1 and a voltage divider module 112, wherein one end of the key SW1 is connected to the first power supply 200, the other end of the key SW1 is respectively connected to the first coil end of the first relay circuit 13 and one end of the voltage divider module 112, and the other end of the voltage divider module 112 is connected to the input end of the controller 15.

[0043] When the button SW1 is pressed, the first power source 200 acts on the voltage divider module 112 via the button SW1 , and the voltage divider module 112 divides the voltage of the first power source 200 to generate a voltage divider signal, which is a first level signal, and the first level signal is a high level signal.

[0044] The voltage dividing module 112 divides the voltage of the first power source 200 to generate a first level signal, which can protect the input end of the controller 15 from being impacted by high voltage.

[0045] The specific voltage value of the first level signal can be set as required and can be achieved by setting the specific composition of the voltage dividing module 112 .

[0046] In some embodiments, Figure 3 As shown, the first relay circuit 13 includes a first relay RY01 and a first unidirectional conduction module 131 , and the second relay circuit 14 includes a second relay RY02 and a second unidirectional conduction module 141 .

[0047] Among them, the contact group of the first relay RY01 is respectively connected to the first power supply 200, one end of the second unidirectional conduction module 141 and one end of the second relay RY02, one end of the coil of the first relay RY01 is respectively connected to one end of the second unidirectional conduction module 141 and one end of the first unidirectional conduction module 131, and the other end of the first unidirectional conduction module 131 is connected to the second end of the button SW1 circuit 11.

[0048] The other end of the coil of the first relay RY01 is connected to the first end of the switch circuit 12, the other end of the coil of the second relay RY02 is grounded, and the contact group of the second relay RY02 is connected to the load of the household appliance.

[0049] When the button SW1 circuit 11 is in the on state, the first power supply 200 supplies power to the coil of the first relay RY01 through the button SW1 circuit 11 and the first unidirectional conduction circuit, and the contact of the first relay RY01 is closed, so that the first power supply 200 supplies power to the coil of the second relay RY02. In addition, the first power supply 200 provides a freewheeling current to the coil of the first relay RY01 through the contact of the first relay RY01 and the second unidirectional conduction circuit, that is, the second unidirectional conduction circuit generates a freewheeling current according to the first power supply 200, and supplies the freewheeling current to the coil of the first relay RY01, so that the contact of the first relay RY01 remains in the attracted state, and then the first power supply 200 continues to supply power to the coil of the second relay RY02, so that the household appliance can be reliably started and continuously maintained in the working state.

[0050] At the same time, the first unidirectional module also has an anti-reverse function to prevent the freewheeling current from flowing to the input end of the controller 15 , thereby protecting the input end of the controller 15 .

[0051] Therefore, the starting circuit 10 can realize reliable starting of the household appliance through the second unidirectional conduction module 141 , and after starting, keep the household appliance in working state, and realize reverse protection for the controller 15 through the first unidirectional conduction module 131 .

[0052] See also Figure 4 , Figure 4 Schematic diagram of a circuit structure of a startup circuit provided by an embodiment of the utility model, such as Figure 4As shown, the voltage divider module 112 includes a first resistor R01, a second resistor R02, a first diode D02 and a first capacitor C01, one end of the first resistor R01 is respectively connected to the button SW1 and the first coil end of the first relay RY01 circuit 13, the other end of the first resistor R01 is respectively connected to one end of the second resistor R02, the anode of the first diode D02, one end of the first capacitor C01 and the input end of the controller 15 (not shown in the figure), and the other end of the second resistor R02 and the other end of the first capacitor C01 are grounded together.

[0053] The switching circuit 12 includes a first transistor TR01, a third resistor R03 and a fourth resistor R04. The base of the first transistor TR01 is connected to one end of the third resistor R03 and one end of the fourth resistor R04 respectively. The other end of the third resistor R03 is connected to the output end of the controller 15. The other end of the fourth resistor R04 and the emitter of the first transistor TR01 are grounded together. The collector of the first transistor TR01 is connected to the second coil end of the first relay RY01 circuit 13.

[0054] The first relay RY01 circuit 13 includes a first relay RY01 and a first unidirectional conduction module 131 , and the second relay RY02 circuit 14 includes a second relay RY02 and a second unidirectional conduction module 141 , wherein the first unidirectional conduction module 131 includes a second diode D01 , and the second unidirectional conduction module 141 includes a third diode D04 .

[0055] The normally closed end (pin 1) of the contact group of the first relay RY01 is connected to the first power supply 200, the normally open end (pin 2) of the contact group of the first relay RY01 is respectively connected to the anode of the third diode D04 and the coil of the second relay RY02, one end of the coil of the first relay RY01 is respectively connected to the cathode of the third diode D04 and the cathode of the second diode D01, the other end of the coil of the first relay RY01 is connected to the collector of the first transistor TR01, the anode of the second diode D01 is respectively connected to the button SW1 and the first resistor R01, and the contact group of the second relay RY02 is connected to the load.

[0056] The voltage of the first power supply 200 can be set as required. In this embodiment, it is 12V.

[0057] Combination Figure 4 , the working principle of the start-up circuit 10 can be described as follows:

[0058] When the working voltage is established, the first power supply 200 supplies power to the button SW1. When the button SW1 is not pressed, the coil of the first relay RY01 has no working voltage, and the input end of the controller 15 receives the second level signal, which is a low level signal. The controller 15 has no output of the control signal and enters the standby state.

[0059] When the button SW1 is pressed, the first power supply 200 establishes a connection with the coil of the first relay RY01 via the button SW1 and the second diode D01. At the same time, the first power supply 200 acts on the voltage divider module 112 via the button SW1, and the first resistor R01 and the second resistor R02 divide the voltage to generate a first level signal. The input end of the controller 15 receives the first level signal key I / 0, which is a high level signal. The controller 15 outputs a control signal RELAX (high level signal) through its output terminal according to the first level signal key I / 0, controls the first transistor TR01 to be turned on, and the first power supply 200—key SW1—second diode D01—coil of the first relay RY01—first transistor TR01—ground forms a closed loop, that is, the working loop of the first relay RY01 is established, the first power supply 200 supplies power to the coil of the first relay RY01, so that the contact group of the first relay RY01 is closed, the first power supply 200 establishes connection with the coil of the second relay RY02 via the contact group of the first relay RY01, the first power supply 200—contact group of the first relay RY01—coil of the second relay RY02 forms a closed loop, that is, the working loop of the second relay RY02 is established, the first power supply 200 supplies power to the coil of the second relay RY02, the contact group of the second relay RY02 is closed, the load of the household appliance is powered on, and the household appliance is started;

[0060] At the same time, the first power supply 200 also supplies power to the coil of the first relay RY01 through the contact group of the first relay RY01 and the third diode D04, and provides a continuous working voltage to the first relay RY01, thereby making the contact group of the first relay RY01 and the contact group of the second relay RY02 continuously remain in a closed state, and the household appliance remains in a working state after starting;

[0061] When shutdown is required, the button SW1 is pressed again, and the input end of the controller 15 receives the first level signal key I / O again, and the corresponding control signal RELAX (low level signal) is output through its output end, controlling the first transistor TR01 to be cut off, the first relay RY01 to stop, and the second relay RY02 to stop, thereby shutting down the household appliance.

[0062] Therefore, when the household appliance needs to be started, only when the button SW1 is pressed, the working circuit of the first relay RY01 and the working circuit of the second relay RY02 can be established, and the household appliance can be started. If the button SW1 is not pressed, even if the controller 15 controls the first transistor TR01 to be turned on, the first relay RY01 and the second relay RY02 cannot work, and the household appliance cannot be started, ensuring the reliability of safe standby.

[0063] To sum up, the starting circuit connects the key circuit in series with the working circuit of the first relay circuit, so that only when the key circuit is in a conductive state, the working circuit of the first relay circuit and the second relay circuit will be established, and the household appliance can be started, thereby preventing accidental starting operations, ensuring reliable standby of the household appliance, and improving safety.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the idea of ​​the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A starting circuit, applied to household appliances, characterized in that: The starting circuit includes: a key circuit, a switch circuit, a first relay circuit, a second relay circuit and a controller; The first end of the key circuit is connected to the first power supply, the second end of the key circuit is connected to the input end of the controller, and the third end of the key circuit is connected to the first coil end of the first relay circuit. When the key circuit is in a conductive state, the key circuit is used to send a first level signal to the controller and control the first power supply to establish a connection with the coil of the first relay circuit. The control end of the switch circuit is connected to the output end of the controller, the first end of the switch circuit is connected to the second coil end of the first relay circuit, and the controller is used to control the switch circuit to be in a conductive state according to the first level signal, so that the first power supply supplies power to the coil of the first relay circuit; The contact group of the first relay circuit is respectively connected to the first power supply and the first coil end of the second relay circuit, the second coil end of the second relay circuit is grounded, and the contact group of the second relay circuit is connected to the load of the household appliance; The first relay circuit is used to control the first power supply to establish a connection with the coil of the second relay circuit when its coil is energized, so that the coil of the second relay circuit is energized, the contact group of the second relay is closed, and then the load of the household appliance is powered on and started.

2. The starting circuit according to claim 1, characterized in that: The key circuit includes a key and a voltage division module; One end of the button is connected to the first power supply, the other end of the button is respectively connected to the first coil end of the first relay circuit and one end of the voltage divider module, and the other end of the voltage divider module is connected to the input end of the controller; The voltage division module is used for dividing the voltage of the first power supply to generate the first level signal when the key is pressed.

3. The starting circuit according to claim 2, characterized in that: The voltage dividing module includes a first resistor, a second resistor, a first diode and a first capacitor; One end of the first resistor is respectively connected to the button and the first coil end of the first relay circuit, the other end of the first resistor is respectively connected to one end of the second resistor, the anode of the first diode, one end of the first capacitor and the input end of the controller, and the other end of the second resistor and the other end of the first capacitor are grounded together.

4. The starting circuit according to claim 1, characterized in that: The switch circuit includes a first transistor, a third resistor and a fourth resistor; The base of the first transistor is respectively connected to one end of the third resistor and one end of the fourth resistor, the other end of the third resistor is connected to the output end of the controller, the other end of the fourth resistor and the emitter of the first transistor are grounded together, and the collector of the first transistor is connected to the second coil end of the first relay circuit.

5. The starting circuit according to any one of claims 1 to 4, characterized in that: The first relay circuit includes a first relay and a first unidirectional conduction module, and the second relay circuit includes a second relay and a second unidirectional conduction module; The contact group of the first relay is respectively connected to the first power supply, one end of the second one-way conduction module and one end of the second relay, one end of the coil of the first relay is respectively connected to one end of the second one-way conduction module and one end of the first one-way conduction module, and the other end of the first one-way conduction module is connected to the second end of the key circuit; The other end of the coil of the first relay is connected to the first end of the switch circuit, the other end of the coil of the second relay is grounded, and the contact group of the second relay is connected to the load of the household appliance; When the button circuit is in a conducting state, the first relay is used to control the first power supply to supply power to the coil of the second relay, the second unidirectional conduction module is used to generate a freewheeling current according to the first power supply, and to conduct the freewheeling current to the coil of the first relay through the freewheeling current, and the first unidirectional conduction module is used to prevent the freewheeling current from flowing to the controller.

6. The starting circuit according to claim 5, characterized in that: The first unidirectional conduction module includes a second diode, and the second unidirectional conduction module includes a third diode; The anode of the second diode is connected to the second end of the key circuit, the cathode of the second diode is respectively connected to the cathode of the third diode and the coil of the first relay, and the anode of the third diode is respectively connected to the contact group of the first relay and the coil of the second relay.

7. A household appliance, characterized in that: The household appliance comprises a load and a starting circuit as described in any one of claims 1 to 6.

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