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

Abstract

The invention is mainly used in the technical field of electronic circuits. The invention 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 present invention relates to the technical field of electronic circuits, and in particular to a power supply circuit, a power supply device and an induction cooker. Background Art

[0002] Induction cooker is a modern kitchen appliance that uses the principle of electromagnetic induction for heating. The working principle of induction cooker determines that it needs higher power to generate sufficient electromagnetic energy during the heating process. However, this high power is unnecessary in standby mode, because the standby power required by tailless appliances (such as wireless charging devices) is much lower than the minimum working power of induction cooker.

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

[0004] In order to solve the above problems, it is usually necessary to add an additional wireless power supply circuit to provide the required low-power electricity to the tailless appliance when the induction cooker is in standby mode. This additional circuit makes the power supply circuit of the induction cooker more complicated and increases the production cost of the induction cooker. Summary of the invention

[0005] The present invention 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 simplify the circuit structure, which is beneficial to reducing the production cost of the induction cooker.

[0006] The present invention 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; 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 control the switch unit to make 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 make 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; The power supply unit is used 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 when the first path is in a off state and the second path is in an on state, supply power to the output unit and perform voltage reduction processing on the preset voltage through the voltage reduction module, so that the output unit outputs electromagnetic energy to the target load according to the preset voltage after the voltage reduction processing.

[0007] Optionally, the switch unit includes a first switch module and a second switch module; The first switch module is used 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.

[0008] Optionally, 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-on 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 an on state, the first switch module controls the power-on channel between the first end and the second end of the relay to be in an open state.

[0009] Optionally, 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.

[0010] Optionally, 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 respectively connected to one end of the resonant capacitor and one end of the resonant inductor, and the second end of the synchronization circuit module is respectively connected to the other end of the resonant capacitor and the other end of the resonant inductor; 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.

[0011] Optionally, the power supply unit includes a filtering 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 used to be grounded.

[0012] 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; The anode of the first diode is used to connect one end of the AC power supply, the anode of the second diode is used to connect 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 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.

[0013] Optionally, 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.

[0014] The present invention also provides a power supply device, comprising the power supply circuit of the electromagnetic cooker as described in any one of the above items.

[0015] The present invention further 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.

[0016] The present invention has at least the following beneficial effects: 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 the standby state of the load respectively. This design allows the circuit to select the most suitable 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 can be adjusted by the step-down module to reduce the power provided to the load, thereby reducing the minimum operating power requirement of the electromagnetic cooker. Since the technical solution of the present application does not need to design a completely independent power supply system for the standby state, it can reduce additional circuit components, thereby simplifying the circuit design, which is conducive to reducing production costs by reducing additional circuit components and simplifying the design. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 It is a first structural schematic diagram of a power supply circuit of an electromagnetic cooker; Figure 2 is a second structural schematic diagram of a power supply circuit of an electromagnetic cooker; Figure 3 is a third structural schematic diagram of a power supply circuit of an electromagnetic cooker; Figure 4 A first circuit diagram of a power supply circuit of an electromagnetic cooker; Figure 5 The second circuit diagram is a power supply circuit of an electromagnetic cooker. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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 used to limit the present invention.

[0020] See also Figure 1 , Figure 1 The first structural schematic diagram of a power supply circuit of an electromagnetic cooker is shown.

[0021] like Figure 1 As described above, this embodiment provides a power supply circuit for an electromagnetic cooker, and the power supply circuit includes a power supply unit, a switch unit, a control unit, and an output unit.

[0022] 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.

[0023] The control unit is used to control the switch unit to make 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 make 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.

[0024] A power supply unit is used 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; when the first path is in a off state and the second path is in an on state, supply power to the output unit and step down the preset voltage through a step-down module, so that the output unit outputs electromagnetic energy to the target load according to the preset voltage after the step-down processing.

[0025] See also Figure 2 , Figure 2 This is a second structural schematic diagram of a power supply circuit of an electromagnetic cooker.

[0026] like Figure 2 In some embodiments, the switch unit includes a first switch module and a second switch module.

[0027] The first switch module is used 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 closed state, and to control the second switch module to be in a second state when the first path is in a closed state and the second path is in an on state.

[0028] 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.

[0029] It can be understood that in this embodiment, the first switch module controls the working state of the second switch module according to the states of the first path and the second path, thereby flexibly selecting the power path. This allows the circuit to select the most suitable power path in different working 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 according to the actual needs of the target load, thereby enhancing the adaptability of the circuit. This is particularly important for devices (such as induction cookers) that need to provide different power in different working states.

[0030] See also Figure 3 , Figure 3 The third structural schematic diagram is a power supply circuit of an electromagnetic cooker.

[0031] like Figure 3 In some embodiments, the switch unit includes a first switch module and a second switch module.

[0032] The step-down module includes a step-down capacitor, and the second switch module includes a relay.

[0033] 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.

[0034] 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.

[0035] 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 an on state and the second path is in a closed state, the first switch module controls the power-on 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 an on state, the first switch module controls the power-on channel between the first end and the second end of the relay to be in an open state.

[0036] It is understandable that capacitors have the characteristic of dividing voltage in AC circuits. In AC circuits, the impedance of capacitors is inversely proportional to the frequency, so voltages of different frequencies can be divided. When an AC signal passes through a step-down capacitor, the capacitor divides the voltage according to its capacitive reactance, thereby generating a lower voltage at both ends of the capacitor. This lower voltage is the result of the step-down.

[0037] In this embodiment, the relay can quickly switch its contacts to achieve rapid control of the circuit, which is very useful for application scenarios that require a quick response. The contacts of the relay can provide good electrical isolation when disconnected, which helps protect the circuit from accidental short circuits or overloads. Relays can carry large currents and voltages, which allows them to control larger loads and enhance the control capabilities of the circuit. The contacts of the relay can completely isolate the power supply when disconnected, which helps improve the safety of the circuit, especially when large currents need to be cut off.

[0038] 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.

[0039] The oscillation circuit module includes a resonant capacitor, a resonant inductor, and a switching tube.

[0040] 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.

[0041] 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.

[0042] In some embodiments, the output unit includes a synchronization circuit module for outputting a synchronization signal.

[0043] 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.

[0044] The first end of the synchronization circuit module is respectively connected to one end of the resonant capacitor and one end of the resonant inductor, and the second end of the synchronization circuit module is respectively connected to the other end of the resonant capacitor and the other end of the resonant inductor.

[0045] 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.

[0046] It can be understood that the present embodiment can realize 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 working 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 accurately controlled. This precise timing control is essential to ensure 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 working state of the drive circuit as needed to adapt to different working conditions. Through synchronous control and precise timing control, the working efficiency and performance of the circuit can be improved. For example, in the application of electromagnetic cookers, this control can ensure the effective transmission of electromagnetic energy and reduce energy loss.

[0047] In some embodiments, the power supply unit includes a filtering module and a conversion module.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] The anode of the first diode is used to connect one end of the AC power supply, the anode of the second diode is used to connect 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 the input end of the switching power supply.

[0052] 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.

[0053] In some embodiments, the controller includes a first sampling terminal and a second sampling terminal.

[0054] The control unit includes a first load module, a second load module and a third load module.

[0055] 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.

[0056] 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.

[0057] The second sampling terminal of the controller is used to connect to the second output terminal of the conversion module.

[0058] It is understandable 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.

[0059] See also Figure 4 , Figure 4 The present invention is a first circuit diagram of a power supply circuit of an electromagnetic cooker.

[0060] like Figure 4 As shown, the present application provides a specific embodiment, the live wire terminal and the neutral wire terminal first provide power to the step-down module. Live wire terminal: This is the place in the circuit diagram where the live wire (L) of the alternating current power (AC) is received. The live wire is a live wire that is usually used to provide power to the circuit. Neutral wire terminal: This is the place in the circuit diagram where the neutral wire (N) of the alternating current power (AC) is received. The neutral wire is usually at the same potential as the ground and is used to complete the circuit loop.

[0061] The voltage output by the step-down module is further processed by the conversion module and converted into the required voltage and current form. The function of the step-down module is to reduce the input high voltage to a lower voltage suitable for subsequent circuits. It usually contains components such as transformers, rectifiers and filters. The power supply at the live and neutral ends is first connected to the step-down module.

[0062] 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).

[0063] In this embodiment, the first switch module is a switch tube, and the second switch module is a relay. The control unit controls the switch tube to be in an open circuit state or a conducting state. When the first path is in a conducting state and the second path is in a closed state, the switch tube is in a conducting state to control the relay to be in a first state; when the first path is in a closed state and the second path is in a conducting state, the switch tube is in a disconnected state to control the relay to be in a 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 end 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 end of the step-down module.

[0064] 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 may include a microcontroller, sensors, and drive circuits to ensure stable operation and safety protection of the circuit.

[0065] 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.

[0066] See also Figure 5 , Figure 5 The second circuit diagram is a power supply circuit of an electromagnetic cooker.

[0067] like Figure 5 As shown, the present application provides a specific embodiment, the live wire terminal and the neutral wire terminal first provide power to the step-down module. Live wire terminal: This is the place in the circuit diagram where the live wire (L) of the alternating current power (AC) is received. The live wire is a live wire that is usually used to provide power to the circuit. Neutral wire terminal: This is the place in the circuit diagram where the neutral wire (N) of the alternating current power (AC) is received. The neutral wire is usually at the same potential as the ground and is used to complete the circuit loop.

[0068] The voltage output by the step-down module is further processed by the conversion module and converted into the required voltage and current form. The function of the step-down module is to reduce the input high voltage to a lower voltage suitable for subsequent circuits. It usually contains components such as transformers, rectifiers and filters. The power supply at the live and neutral ends is first connected to the step-down module. The step-down module is a step-down capacitor.

[0069] 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.

[0070] 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).

[0071] 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 the 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-on channel between the first end and the second end 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 an off state to control the power-on channel between the first end and the second end of the relay to be in an open state, and the AC signal is stepped down through the step-down capacitor.

[0072] 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 may include a microcontroller, sensors, and drive circuits to ensure stable operation and safety protection of the circuit.

[0073] 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.

[0074] The controller includes a first sampling terminal and a second sampling terminal.

[0075] The control unit includes a first load module, a second load module and a third load module. The first load module includes four series resistors, the second load module includes a resistor and a capacitor connected in parallel, and the third load module is a resistor.

[0076] 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.

[0077] The second sampling terminal of the controller is used to connect to the second output terminal of the conversion module.

[0078] 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.

[0079] The power supply unit also includes a switching power supply module, which is used to convert the AC power signal into a DC power with a preset voltage and current, and then supply power to the controller and the drive circuit module.

[0080] 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 one end of the AC power supply, the anode of the second diode is used to connect 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 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 drive circuit module.

[0081] 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.

[0082] The oscillation circuit module includes a resonant capacitor, a resonant inductor, a switch tube, a voltage-stabilizing diode, and a voltage-stabilizing resistor.

[0083] 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 and the resonant inductor are connected in parallel. One end of the zener diode is connected to the first end of the switch tube, the other end of the zener diode is grounded, and the zener diode and the zener resistor are connected in parallel.

[0084] The controller is also used to receive a synchronization signal and control the driving circuit module to output a driving signal.

[0085] The output unit includes a synchronization circuit module for outputting a synchronization signal.

[0086] 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 respectively connected to one end of the resonant capacitor and one end of the resonant inductor, and the second terminal of the synchronization circuit module is respectively connected to the other end of the resonant capacitor and the other end of the resonant inductor. 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 end of the drive circuit module.

[0087] 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.

[0088] This embodiment also provides a power supply device, including the power supply circuit of the electromagnetic cooker as described in any one of the above items.

[0089] 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.

[0090] It is understandable that in any of the above embodiments, the circuit is designed with a first path and a second path, which correspond to the normal working state and the standby state of the load, respectively. This design allows the circuit to select the most suitable 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 can be adjusted by the step-down module to reduce the power provided to the load, thereby reducing the minimum operating power requirement of the electromagnetic cooker. Since the technical solution of the present application does not need to design a completely independent power supply system for the standby state, it can reduce additional circuit components, thereby simplifying the circuit design, and by reducing additional circuit components and simplifying the design, it is conducive to reducing production costs.

[0091] 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 sequence. 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 be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations 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 that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0092] It should be understood that in the present 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 objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single 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.

[0093] Although the description of the present application has been quite detailed and specifically describes several described embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, but should be regarded as providing a broad possible interpretation of these claims by reference to the attached 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 foreseeable by the inventor, 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 control the switch unit to make 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 make 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; The power supply unit is used 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 when the first path is in a off state and the second path is in an on state, supply power to the output unit and perform voltage reduction processing on the preset voltage through the voltage reduction module, 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 comprises a first switch module and a second switch module; The first switch module is used 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 comprises 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-on 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 an on state, the first switch module controls the power-on 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 oscillating circuit module for outputting electromagnetic energy, and a driving circuit module for outputting a driving signal to the oscillating 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 respectively connected to one end of the resonant capacitor and one end of the resonant inductor, and the second end of the synchronization circuit module is respectively connected to the other end of the resonant capacitor and the other end of the resonant inductor; 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.

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 used to be 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 one end of the AC power supply, the anode of the second diode is used to connect 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 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 for an electromagnetic cooker comprising the power supply circuit of any one of claims 1 to 8.

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

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