Power supply circuit and power supply device of induction cooker and induction cooker

Abstract

The circuit is mainly used in the technical field of electronic circuits. The utility model discloses a power supply circuit of an electromagnetic range, a power supply device and the electromagnetic range. The power supply circuit is designed to be used for adjusting a power supply mode according to the working state of a target load. The circuit is composed of a power supply unit, a switch unit, a control unit and an output unit. The power supply unit comprises a voltage reduction module and is responsible for power supply. And the control unit controls the switch unit to conduct the first access during normal work or conduct the second access in a standby state according to the load state. In a normal working state, the power supply unit directly supplies power to the output unit to output electromagnetic energy; in the standby state, the power supply supplies power through the step-down module, and the output voltage is reduced. The requirement for the minimum working power of the electromagnetic range can be met through voltage reduction processing, meanwhile, the circuit structure is simplified, and the production cost of the electromagnetic range can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a power supply circuit, a power supply device and an induction cooker. Background Art

[0002] An induction cooktop is a modern kitchen appliance that utilizes electromagnetic induction for heating. This operating principle dictates that it requires high power to generate sufficient electromagnetic energy during heating. However, this high power consumption is unnecessary during standby mode, as the standby power required by tailless appliances (such as wireless charging devices) is far lower than the minimum operating power of an induction cooktop.

[0003] Electric appliances without tails, especially those using wireless charging technology, usually require only very low power to maintain standby mode. This means that if the minimum operating power of the induction cooktop cannot be reduced to match the needs of these appliances, it will not be able to directly provide them with the required power.

[0004] To address these issues, an additional wireless power supply circuit is typically required to provide the low-power electricity required by the tailless appliance when the induction cooker is in standby mode. This additional circuit increases the complexity of the induction cooker's power supply circuit and increases the production cost of the induction cooker. Utility Model Content

[0005] The utility model provides a power supply circuit, a power supply device and an induction cooker for an induction cooker, which can meet the minimum working power requirement of the induction cooker through voltage reduction processing, and at the same time simplify the circuit structure, which is conducive to reducing the production cost of the induction cooker.

[0006] The utility model provides a power supply circuit for an electromagnetic cooker, the power supply circuit comprising a power supply unit, a switch unit, a control unit and an output unit;

[0007] The power supply unit is connected to the output unit via a first path or a second path, and the power supply unit includes a step-down module;

[0008] The control unit is configured to, when detecting that the target load is in a normal working state, control the switch unit to put the first path in an on state and the second path in an off state; and, when detecting that the target load is in a standby state, control the switch unit to put the first path in an off state and the second path in an on state;

[0009] The power supply unit is configured to supply power to the output unit when the first path is in an on state and the second path is in a off state, so that the output unit outputs electromagnetic energy to the target load according to a preset voltage; and to supply power to the output unit and perform voltage reduction processing on the preset voltage through the voltage reduction module when the first path is in an off state and the second path is in an on state, so that the output unit outputs electromagnetic energy to the target load according to the preset voltage after the voltage reduction processing.

[0010] Optionally, the switch unit includes a first switch module and a second switch module;

[0011] The first switch module is configured to control the second switch module to be in a first state when the first path is in an on state and the second path is in a off state, and to control the second switch module to be in a second state when the first path is in a off state and the second path is in an on state;

[0012] The first end of the second switch module is used to input an AC signal. When the second switch module is in a first state, the second end of the switch module is connected to the output end of the step-down module. When the second switch module is in a second state, the second end of the switch module is connected to the input end of the step-down module.

[0013] Optionally, the switch unit includes a first switch module and a second switch module;

[0014] The step-down module includes a step-down capacitor, and the second switch module includes a relay;

[0015] The first end of the first switch module is connected to the third end of the relay, and the second end of the first switch module is grounded;

[0016] One end of the step-down capacitor serves as the input end of the step-down module, and the other end of the step-down capacitor serves as the output end of the step-down module;

[0017] The first end of the relay is connected to one end of the step-down capacitor, the second end of the relay is connected to the other end of the step-down capacitor, and the fourth end of the relay is used to connect to a power supply. When the first path is in an on state and the second path is in a closed state, the first switch module controls the power channel between the first end and the second end of the relay to be in a closed state. When the first path is in a closed state and the second path is in a on state, the first switch module controls the power channel between the first end and the second end of the relay to be in an open state.

[0018] Optionally, the output unit includes an oscillation circuit module for outputting electromagnetic energy, and a driving circuit module for outputting a driving signal to the oscillation circuit module;

[0019] The oscillation circuit module includes a resonant capacitor, a resonant inductor, and a switch tube;

[0020] The first end of the switch tube is connected to the output end of the driving circuit module, the second end of the switch tube is grounded, and the third end of the switch tube is respectively connected to one end of the resonant capacitor and one end of the resonant inductor;

[0021] The other end of the resonant capacitor is used for grounding, and the other end of the resonant inductor is used for grounding, and the resonant capacitor is connected in parallel with the resonant inductor.

[0022] Optionally, the output unit includes a synchronization circuit module for outputting a synchronization signal;

[0023] The control unit includes a controller, and the controller includes a first synchronization signal terminal, a second synchronization signal terminal and a drive control terminal;

[0024] The first end of the synchronization circuit module is connected to one end of the resonant capacitor and one end of the resonant inductor respectively, and the second end of the synchronization circuit module is connected to the other end of the resonant capacitor and the other end of the resonant inductor respectively;

[0025] The first synchronization signal terminal of the controller is connected to the third terminal of the synchronization circuit module, the second synchronization signal terminal of the controller is connected to the fourth terminal of the synchronization circuit module, and the drive control terminal of the controller is connected to the input terminal of the drive circuit module.

[0026] Optionally, the power supply unit includes a filtering module and a conversion module;

[0027] The first end of the filter module is used to connect to one end of the AC power supply, the second end of the filter module is used to connect to the other end of the AC power supply, the third end of the filter module is connected to the first input end of the conversion module, and the fourth end of the filter module is connected to the second input end of the conversion module;

[0028] The first output terminal of the conversion module is used to output a direct current signal, and the second output terminal of the conversion module is grounded.

[0029] Optionally, the control unit includes a controller, the power supply unit includes a switching power supply module, and the switching power supply module includes a switching power supply, a first diode, a second diode, and a third diode;

[0030] The anode of the first diode is used to connect to one end of the AC power supply, the anode of the second diode is used to connect to the other end of the AC power supply, the anode of the third diode is connected to the cathode of the first diode and the cathode of the second diode respectively, and the cathode of the third diode is used to connect to the input end of the switching power supply;

[0031] The first output end of the switching power supply is used to supply power to the controller, and the second output end of the switching power supply is used to supply power to the driving circuit module.

[0032] Optionally, the controller includes a first sampling terminal and a second sampling terminal;

[0033] The control unit includes a first load module, a second load module and a third load module;

[0034] One end of the first load module is connected to the anode of the third diode, and the other end of the first load module is connected to one end of the second load module and one end of the third load module respectively;

[0035] The other end of the second load module is grounded, and the other end of the third load module is connected to the first sampling end of the controller;

[0036] The second sampling terminal of the controller is used to connect to the second output terminal of the conversion module.

[0037] The utility model also provides a power supply device, comprising the power supply circuit of the electromagnetic cooker as described in any one of the above items.

[0038] The utility model also provides an induction cooker, comprising the power supply device as described above, or the power supply circuit of the induction cooker as described in any one of the above items.

[0039] The utility model has at least the following beneficial effects:

[0040] In the technical solution of the present application, the circuit is designed with a first path and a second path, which correspond to the normal working state and standby state of the load respectively. This design allows the circuit to select the most appropriate power supply path according to the actual needs of the load. The control unit can detect the working state of the target load and intelligently control the switch unit accordingly to select the correct path. When the load is working normally, the control unit turns on the first path and directly supplies power to the output unit to provide the required electromagnetic energy. When the load is on standby, the control unit switches to the second path and supplies power after reducing the voltage through the step-down module. The step-down module in the power supply unit is the key to achieving the reduction of the minimum operating power. In standby mode, the voltage is adjusted by the step-down module, which can reduce the power supplied to the load, thereby reducing the minimum operating power requirement of the induction cooker. Since the technical solution of the present application does not require the design of a completely independent power supply system for the standby state, additional circuit components can be reduced, thereby simplifying the circuit design. By reducing additional circuit components and simplifying the design, it is helpful to reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0042] Figure 1 This is a first structural schematic diagram of a power supply circuit of an electromagnetic cooker;

[0043] Figure 2 is a second structural schematic diagram of a power supply circuit of an electromagnetic cooker;

[0044] Figure 3 is a third structural schematic diagram of a power supply circuit of an electromagnetic cooker;

[0045] Figure 4 A first circuit diagram of a power supply circuit of an electromagnetic cooker;

[0046] Figure 5 The second circuit diagram is a power supply circuit of an electromagnetic cooker. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0048] See Figure 1 , Figure 1 This is a first structural schematic diagram of a power supply circuit for an electromagnetic cooker.

[0049] like Figure 1 As described above, this embodiment provides a power supply circuit for an electromagnetic cooker, which includes a power supply unit, a switch unit, a control unit, and an output unit.

[0050] The power supply unit is connected to the output unit via a first path or a second path, and the power supply unit includes a step-down module.

[0051] The control unit is configured to control the switch unit to put the first path in an on state and the second path in an off state when it is detected that the target load is in a normal working state, and to control the switch unit to put the first path in an off state and the second path in an on state when it is detected that the target load is in a standby state.

[0052] The power supply unit is used to supply power to the output unit when the first path is in the on state and the second path is in the off state, so that the output unit outputs electromagnetic energy to the target load according to the preset voltage; when the first path is in the off state and the second path is in the on state, supply power to the output unit and reduce the preset voltage through the step-down module, so that the output unit outputs electromagnetic energy to the target load according to the preset voltage after the step-down process.

[0053] See Figure 2 , Figure 2 This is a second structural schematic diagram of a power supply circuit for an electromagnetic cooker.

[0054] like Figure 2 As mentioned above, in some embodiments, the switch unit includes a first switch module and a second switch module.

[0055] The first switch module is used to control the second switch module to be in the first state when the first path is in the on state and the second path is in the off state, and to control the second switch module to be in the second state when the first path is in the off state and the second path is in the on state.

[0056] The first end of the second switch module is used to input an AC signal. When the second switch module is in a first state, the second end of the switch module is connected to the output end of the step-down module. When the second switch module is in a second state, the second end of the switch module is connected to the input end of the step-down module.

[0057] It will be appreciated that in this embodiment, the first switching module controls the operating state of the second switching module based on the states of the first and second paths, thereby flexibly selecting the power path. This allows the circuit to select the most appropriate power path in different operating modes (normal operation or standby) to meet the power requirements of the target load, thereby achieving flexible power path control. This design allows the circuit to dynamically adjust the power path based on the actual needs of the target load, enhancing the circuit's adaptability. This is particularly important for devices that require different power levels in different operating states, such as induction cooktops.

[0058] See Figure 3 , Figure 3 This is a third structural schematic diagram of a power supply circuit for an electromagnetic cooker.

[0059] like Figure 3 As mentioned above, in some embodiments, the switch unit includes a first switch module and a second switch module.

[0060] The step-down module includes a step-down capacitor, and the second switch module includes a relay.

[0061] The first end of the first switch module is connected to the third end of the relay, and the second end of the first switch module is grounded.

[0062] One end of the step-down capacitor serves as the input end of the step-down module, and the other end of the step-down capacitor serves as the output end of the step-down module.

[0063] The first end of the relay is connected to one end of the step-down capacitor, the second end of the relay is connected to the other end of the step-down capacitor, and the fourth end of the relay is used to connect to the power supply. When the first path is in the on state and the second path is in the off state, the first switch module controls the power channel between the first end and the second end of the relay to be in the closed state. When the first path is in the off state and the second path is in the on state, the first switch module controls the power channel between the first end and the second end of the relay to be in the open state.

[0064] It's well understood that capacitors have the characteristic of voltage division in AC circuits. In AC circuits, the impedance of a capacitor is inversely proportional to the frequency, allowing it to divide voltages of different frequencies. When an AC signal passes through a step-down capacitor, the capacitor divides the voltage based on its capacitive reactance, resulting in a lower voltage across the capacitor. This lower voltage is the result of the voltage step-down.

[0065] In this embodiment, the relay can rapidly switch its contacts, enabling rapid control of the circuit. This is particularly useful for applications requiring a fast response. The relay's contacts, when open, provide excellent electrical isolation, helping to protect the circuit from accidental short circuits or overloads. Relays can carry high currents and voltages, allowing them to control larger loads and enhancing the circuit's control capabilities. The relay's contacts, when open, completely isolate the power supply, helping to improve circuit safety, particularly when high currents need to be interrupted.

[0066] In some embodiments, the output unit includes an oscillation circuit module for outputting electromagnetic energy, and a driving circuit module for outputting a driving signal to the oscillation circuit module.

[0067] The oscillation circuit module includes a resonant capacitor, a resonant inductor, and a switching tube.

[0068] The first end of the switch tube is connected to the output end of the driving circuit module, the second end of the switch tube is grounded, and the third end of the switch tube is respectively connected to one end of the resonant capacitor and one end of the resonant inductor.

[0069] The other end of the resonant capacitor is used for grounding, the other end of the resonant inductor is used for grounding, and the resonant capacitor and the resonant inductor are connected in parallel.

[0070] In some embodiments, the output unit includes a synchronization circuit module for outputting a synchronization signal.

[0071] The control unit includes a controller, and the controller includes a first synchronization signal terminal, a second synchronization signal terminal and a drive control terminal.

[0072] The first end of the synchronization circuit module is connected to one end of the resonant capacitor and one end of the resonant inductor respectively, and the second end of the synchronization circuit module is connected to the other end of the resonant capacitor and the other end of the resonant inductor respectively.

[0073] The first synchronization signal terminal of the controller is connected to the third terminal of the synchronization circuit module, the second synchronization signal terminal of the controller is connected to the fourth terminal of the synchronization circuit module, and the driving control terminal of the controller is connected to the input terminal of the driving circuit module.

[0074] It can be understood that this embodiment can achieve synchronous control of different parts of the circuit through the synchronous circuit module. The synchronous circuit module is connected to the resonant capacitor and the resonant inductor, which means that it can control the operating state of the resonant circuit and ensure the stable operation of the circuit. The controller is connected to the synchronous circuit module through the first synchronization signal terminal and the second synchronization signal terminal, so that the timing of the circuit can be precisely controlled. This precise timing control is crucial to ensuring the efficient and stable operation of the circuit. The drive control terminal of the controller is connected to the input terminal of the drive circuit module, providing flexible control of the drive circuit. This connection allows the controller to adjust the operating state of the drive circuit as needed to adapt to different operating conditions. Through synchronous control and precise timing control, the operating efficiency and performance of the circuit can be improved. For example, in the application of induction cookers, this control can ensure the effective transmission of electromagnetic energy and reduce energy loss.

[0075] In some embodiments, the power supply unit includes a filtering module and a conversion module.

[0076] The first end of the filter module is used to connect to one end of the AC power supply, the second end of the filter module is used to connect to the other end of the AC power supply, the third end of the filter module is connected to the first input end of the conversion module, and the fourth end of the filter module is connected to the second input end of the conversion module.

[0077] The first output terminal of the conversion module is used to output a direct current signal, and the second output terminal of the conversion module is used to be grounded.

[0078] In some embodiments, the control unit includes a controller, the power supply unit includes a switching power supply module, and the switching power supply module includes a switching power supply, a first diode, a second diode, and a third diode.

[0079] The positive electrode of the first diode is used to connect to one end of the AC power supply, the positive electrode of the second diode is used to connect to the other end of the AC power supply, the positive electrode of the third diode is connected to the negative electrode of the first diode and the negative electrode of the second diode respectively, and the negative electrode of the third diode is used to connect to the input end of the switching power supply.

[0080] The first output terminal of the switching power supply is used to supply power to the controller, and the second output terminal of the switching power supply is used to supply power to the driving circuit module.

[0081] In some embodiments, the controller includes a first sampling terminal and a second sampling terminal.

[0082] The control unit includes a first load module, a second load module and a third load module.

[0083] One end of the first load module is connected to the anode of the third diode, and the other end of the first load module is connected to one end of the second load module and one end of the third load module respectively.

[0084] The other end of the second load module is grounded, and the other end of the third load module is connected to the first sampling end of the controller.

[0085] The second sampling terminal of the controller is used to connect to the second output terminal of the conversion module.

[0086] It is understood that the controller is provided with a first sampling terminal and a second sampling terminal for monitoring key parameters in the circuit. The controller can dynamically adjust power distribution according to load demand and power status to reduce energy waste.

[0087] See Figure 4 , Figure 4 The first circuit diagram is a power supply circuit of an electromagnetic cooker.

[0088] like Figure 4 As shown, the present application provides a specific embodiment in which the live and neutral terminals first provide power to the step-down module. The live terminal is the point in a circuit diagram where the live wire (L) of the alternating current (AC) power source is received. The live wire is a live conductor and is typically used to provide power to the circuit. The neutral terminal is the point in a circuit diagram where the neutral wire (N) of the alternating current (AC) power source is received. The neutral wire is typically at the same potential as ground and completes the circuit loop.

[0089] The voltage output from the step-down module is further processed by the conversion module, converting it into the required voltage and current. The step-down module reduces the input high voltage to a lower voltage suitable for subsequent circuits. It typically includes components such as a transformer, rectifier, and filter. The power supply at the live and neutral terminals is first connected to the step-down module.

[0090] The output of the conversion module is connected to the output unit to provide power to external devices. The function of the conversion module is to convert the stepped-down alternating current (AC) into direct current (DC).

[0091] In this embodiment, the first switch module is a switch tube, and the second switch module is a relay. A control unit controls the switch tube to be in either an open or closed state. When the first path is in the open state and the second path is closed, the switch tube is in the open state, controlling the relay to be in the first state. When the first path is closed and the second path is in the open state, the switch tube is in the open state, controlling the relay to be in the second state. The first end of the relay is used to input an AC signal. When the relay is in the first state, the second end of the switch module is connected to the output of the step-down module. When the relay is in the second state, the second end of the switch module is connected to the input of the step-down module.

[0092] The control unit is responsible for managing the working status of the entire circuit, including voltage and current regulation, overload protection, fault detection, etc. It can include a microcontroller, sensors, and drive circuits to ensure stable operation and safety protection of the circuit.

[0093] The output unit is the place in the circuit that outputs the converted electrical energy to the load. It is a stable DC power supply output used to drive tailless electrical appliances.

[0094] See Figure 5 , Figure 5 The second circuit diagram is a power supply circuit of an electromagnetic cooker.

[0095] like Figure 5 As shown, the present application provides a specific embodiment in which the live and neutral terminals first provide power to the step-down module. The live terminal is the point in a circuit diagram where the live wire (L) of the alternating current (AC) power source is received. The live wire is a live conductor and is typically used to provide power to the circuit. The neutral terminal is the point in a circuit diagram where the neutral wire (N) of the alternating current (AC) power source is received. The neutral wire is typically at the same potential as ground and completes the circuit loop.

[0096] The voltage output from the step-down module is further processed by the conversion module, converting it into the required voltage and current. The step-down module reduces the input high voltage to a lower voltage suitable for subsequent circuits. It typically includes components such as a transformer, rectifier, and filter. The power supply at the live and neutral terminals is first connected to the step-down module, which is a capacitor that reduces the voltage.

[0097] In the power supply unit, the filter module acts on the AC signal, and the AC signal after filtering is input to the conversion module.

[0098] The output of the conversion module is connected to the output unit to provide power to external devices. The function of the conversion module is to convert the stepped-down alternating current (AC) into direct current (DC).

[0099] In the switch unit, the first switch module is a switch tube, and the second switch module is a relay. The first end of the switch tube is connected to the third end of the relay, and the second end of the switch tube is grounded. One end of the step-down capacitor serves as the input end of the step-down module, and the other end of the step-down capacitor serves as the output end of the step-down module. The first end of the relay is connected to one end of the step-down capacitor, the second end of the relay is connected to the other end of the step-down capacitor, and the fourth end of the relay is used to connect to a power supply. When the first path is in the on state and the second path is in the off state, the switch tube is turned on to control the power channel between the first and second ends of the relay to be in a closed state, causing the step-down capacitor to be short-circuited; when the first path is in the off state and the second path is in the on state, the switch tube is in the off state to control the power channel between the first and second ends of the relay to be in an open state, and the AC signal is stepped down through the step-down capacitor.

[0100] The control unit is responsible for managing the working status of the entire circuit, including voltage and current regulation, overload protection, fault detection, etc. It can include a microcontroller, sensors, and drive circuits to ensure stable operation and safety protection of the circuit.

[0101] The control unit includes a controller. On the one hand, the controller can control the switch tube to be in an on state or an off state. On the other hand, the controller performs sampling through a first sampling terminal and a second sampling terminal.

[0102] The controller includes a first sampling terminal and a second sampling terminal.

[0103] The control unit includes a first load module, a second load module and a third load module. The first load module includes four resistors connected in series, the second load module includes a resistor and a capacitor connected in parallel, and the third load module is a single resistor.

[0104] One end of the first load module is connected to the anode of the third diode, and the other end of the first load module is connected to one end of the second load module and one end of the third load module respectively. The other end of the second load module is grounded, and the other end of the third load module is connected to the first sampling terminal of the controller.

[0105] The second sampling terminal of the controller is used to connect to the second output terminal of the conversion module.

[0106] The output unit is the place in the circuit that outputs the converted electrical energy to the load. It is a stable DC power supply output used to drive tailless electrical appliances.

[0107] The power supply unit also includes a switching power supply module, which is used to convert the AC power signal into DC power with a preset voltage and current, and then supply power to the controller and the drive circuit module.

[0108] The switching power supply module includes a switching power supply, a first diode, a second diode, and a third diode. The anode of the first diode is connected to one end of the AC power supply, the anode of the second diode is connected to the other end of the AC power supply, the anode of the third diode is connected to the cathode of the first diode and the cathode of the second diode, respectively, and the cathode of the third diode is connected to the input of the switching power supply. The first output of the switching power supply is used to supply power to the controller, and the second output of the switching power supply is used to supply power to the drive circuit module.

[0109] The output unit includes an oscillation circuit module for outputting electromagnetic energy and a driving circuit module for outputting a driving signal to the oscillation circuit module.

[0110] The oscillation circuit module includes a resonant capacitor, a resonant inductor, a switching tube, a voltage-stabilizing diode, and a voltage-stabilizing resistor.

[0111] The first end of the switching tube is connected to the output end of the drive circuit module, the second end of the switching tube is grounded, and the third end of the switching tube is connected to one end of the resonant capacitor and one end of the resonant inductor, respectively. The other end of the resonant capacitor is grounded, and the other end of the resonant inductor is grounded, with the resonant capacitor and the resonant inductor connected in parallel. One end of the Zener diode is connected to the first end of the switching tube, the other end of the Zener diode is grounded, and the Zener diode is connected in parallel with the Zener resistor.

[0112] The controller is further used to receive a synchronization signal and control the driving circuit module to output a driving signal.

[0113] The output unit includes a synchronization circuit module for outputting a synchronization signal.

[0114] The controller includes a first synchronization signal terminal, a second synchronization signal terminal, and a drive control terminal. The first terminal of the synchronization circuit module is connected to one end of the resonant capacitor and one end of the resonant inductor, respectively, and the second terminal of the synchronization circuit module is connected to the other end of the resonant capacitor and the other end of the resonant inductor, respectively. The first synchronization signal terminal of the controller is connected to the third end of the synchronization circuit module, the second synchronization signal terminal of the controller is connected to the fourth end of the synchronization circuit module, and the drive control terminal of the controller is connected to the input terminal of the drive circuit module.

[0115] The controller samples the synchronization signal of the resonant circuit to ensure that the PPG signal is output at the lowest point of the C pole voltage during LC oscillation to drive the switch tube of the oscillation circuit module to turn on, thereby replenishing energy for the LC oscillation circuit.

[0116] This embodiment also provides a power supply device, including the power supply circuit of any of the above electromagnetic cookers.

[0117] This embodiment also provides an induction cooker, comprising the above power supply device or the power supply circuit of any one of the above induction cookers.

[0118] It will be appreciated that in any of the above embodiments, the circuit is designed with a first path and a second path, corresponding to the normal operating state and standby state of the load, respectively. This design allows the circuit to select the most appropriate power supply path based on the actual needs of the load. The control unit can detect the operating state of the target load and intelligently control the switching unit accordingly to select the correct path. When the load is operating normally, the control unit turns on the first path, directly supplying power to the output unit to provide the required electromagnetic energy. When the load is in standby mode, the control unit switches to the second path, using the step-down module to reduce the voltage before supplying power. The step-down module in the power supply unit is key to achieving a reduction in minimum operating power. In standby mode, the voltage is adjusted by the step-down module, reducing the power supplied to the load, thereby lowering the minimum operating power requirement of the induction cooker. Because the technical solution of this application does not require the design of a completely independent power supply system for the standby state, it can reduce additional circuit components, thereby simplifying the circuit design. By reducing additional circuit components and simplifying the design, production costs are reduced.

[0119] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0120] It should be understood that in this application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0121] Although the description of the present application has been quite detailed and specifically describes several embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, but should be considered to provide a broad possible interpretation of these claims by reference to the appended claims, taking into account the prior art, so as to effectively cover the intended scope of the present application. In addition, the above description of the present application is based on the embodiments that the utility model can foresee, and its purpose is to provide a useful description, and those non-substantial changes to the present application that have not yet been foreseen may still represent equivalent changes to the present application.

Claims

1. A power supply circuit for an electromagnetic cooker, characterized in that: The power supply circuit includes a power supply unit, a switch unit, a control unit and an output unit; The power supply unit is connected to the output unit via a first path or a second path, and the power supply unit includes a step-down module; The control unit is configured to, when detecting that the target load is in a normal working state, control the switch unit to put the first path in an on state and the second path in an off state; and, when detecting that the target load is in a standby state, control the switch unit to put the first path in an off state and the second path in an on state; The power supply unit is configured to supply power to the output unit when the first path is in an on state and the second path is in a off state, so that the output unit outputs electromagnetic energy to the target load according to a preset voltage; and to supply power to the output unit and perform voltage reduction processing on the preset voltage through the voltage reduction module when the first path is in an off state and the second path is in an on state, so that the output unit outputs electromagnetic energy to the target load according to the preset voltage after the voltage reduction processing.

2. The power supply circuit of an electromagnetic cooker according to claim 1, characterized in that: The switch unit includes a first switch module and a second switch module; The first switch module is configured to control the second switch module to be in a first state when the first path is in an on state and the second path is in a off state, and to control the second switch module to be in a second state when the first path is in a off state and the second path is in an on state; The first end of the second switch module is used to input an AC signal. When the second switch module is in a first state, the second end of the switch module is connected to the output end of the step-down module. When the second switch module is in a second state, the second end of the switch module is connected to the input end of the step-down module.

3. The power supply circuit of an electromagnetic cooker according to claim 1, characterized in that: The switch unit includes a first switch module and a second switch module; The step-down module includes a step-down capacitor, and the second switch module includes a relay; The first end of the first switch module is connected to the third end of the relay, and the second end of the first switch module is grounded; One end of the step-down capacitor serves as the input end of the step-down module, and the other end of the step-down capacitor serves as the output end of the step-down module; The first end of the relay is connected to one end of the step-down capacitor, the second end of the relay is connected to the other end of the step-down capacitor, and the fourth end of the relay is used to connect to a power supply. When the first path is in an on state and the second path is in a closed state, the first switch module controls the power channel between the first end and the second end of the relay to be in a closed state. When the first path is in a closed state and the second path is in a on state, the first switch module controls the power channel between the first end and the second end of the relay to be in an open state.

4. The power supply circuit of an electromagnetic cooker according to claim 1, characterized in that: The output unit includes an oscillation circuit module for outputting electromagnetic energy, and a drive circuit module for outputting a drive signal to the oscillation circuit module; The oscillation circuit module includes a resonant capacitor, a resonant inductor, and a switch tube; The first end of the switch tube is connected to the output end of the driving circuit module, the second end of the switch tube is grounded, and the third end of the switch tube is respectively connected to one end of the resonant capacitor and one end of the resonant inductor; The other end of the resonant capacitor is used for grounding, and the other end of the resonant inductor is used for grounding, and the resonant capacitor is connected in parallel with the resonant inductor.

5. The power supply circuit of an electromagnetic cooker according to claim 4, characterized in that: The output unit includes a synchronization circuit module for outputting a synchronization signal; The control unit includes a controller, and the controller includes a first synchronization signal terminal, a second synchronization signal terminal and a drive control terminal; The first end of the synchronization circuit module is connected to one end of the resonant capacitor and one end of the resonant inductor respectively, and the second end of the synchronization circuit module is connected to the other end of the resonant capacitor and the other end of the resonant inductor respectively; The first synchronization signal terminal of the controller is connected to the third terminal of the synchronization circuit module, the second synchronization signal terminal of the controller is connected to the fourth terminal of the synchronization circuit module, and the drive control terminal of the controller is connected to the input terminal of the drive circuit module.

6. The power supply circuit of an electromagnetic cooker according to claim 4, characterized in that: The power supply unit includes a filter module and a conversion module; The first end of the filter module is used to connect to one end of the AC power supply, the second end of the filter module is used to connect to the other end of the AC power supply, the third end of the filter module is connected to the first input end of the conversion module, and the fourth end of the filter module is connected to the second input end of the conversion module; The first output terminal of the conversion module is used to output a direct current signal, and the second output terminal of the conversion module is grounded.

7. The power supply circuit of an electromagnetic cooker according to claim 6, characterized in that: The control unit includes a controller, the power supply unit includes a switching power supply module, and the switching power supply module includes a switching power supply, a first diode, a second diode, and a third diode; The anode of the first diode is used to connect to one end of the AC power supply, the anode of the second diode is used to connect to the other end of the AC power supply, the anode of the third diode is connected to the cathode of the first diode and the cathode of the second diode respectively, and the cathode of the third diode is used to connect to the input end of the switching power supply; The first output end of the switching power supply is used to supply power to the controller, and the second output end of the switching power supply is used to supply power to the driving circuit module.

8. The power supply circuit of an electromagnetic cooker according to claim 7, characterized in that: The controller includes a first sampling terminal and a second sampling terminal; The control unit includes a first load module, a second load module and a third load module; One end of the first load module is connected to the anode of the third diode, and the other end of the first load module is connected to one end of the second load module and one end of the third load module respectively; The other end of the second load module is grounded, and the other end of the third load module is connected to the first sampling end of the controller; The second sampling terminal of the controller is used to connect to the second output terminal of the conversion module.

9. A power supply device, characterized in that: A power supply circuit comprising the electromagnetic cooker according to any one of claims 1 to 8.

10. An induction cooker, characterized in that: It comprises the power supply device according to claim 9, or the power supply circuit of the electromagnetic cooker according to any one of claims 1 to 8.

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