Electromagnetic induction working circuit, electromagnetic induction heater and induction cooker

Abstract

The circuit is mainly used in the technical field of electronic circuits. The utility model discloses an electromagnetic induction working circuit, an electromagnetic induction heater and an induction cooker, the electromagnetic induction working circuit comprises a switch module and an electromagnetic induction module, and the switch module is connected with the electromagnetic induction module; the switch module is used for forming a transmission channel of a preset alternating current when the switch module is in an on state, so that the preset alternating current is transmitted to the electromagnetic induction module; and the electromagnetic induction module is used for generating a magnetic field by using preset alternating current and outputting electromagnetic energy. The circuit is simple in structure and can work under the condition of the same electromagnetic frequency, and therefore the difference frequency effect caused by different electromagnetic frequencies is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to an electromagnetic induction working circuit, an electromagnetic induction heater and an electromagnetic cooker. Background Art

[0002] A multi-burner induction cooker is a modern cooker with multiple induction burners on a single heating surface. The circuit design of these burners is complex, requiring each burner to be configured with a different electromagnetic frequency. When multiple burners operate simultaneously, each burner generates a magnetic field at a different frequency. The superposition of these different frequencies generates electromagnetic waves at a difference frequency. When the difference frequency is within the human hearing range, these electromagnetic waves can cause severe noise disturbance. Utility Model Content

[0003] The utility model provides an electromagnetic induction working circuit, an electromagnetic induction heater and an electromagnetic cooker, which have a simple circuit structure and can work under the same electromagnetic frequency, thereby avoiding the difference frequency effect caused by different electromagnetic frequencies.

[0004] The utility model provides an electromagnetic induction working circuit, comprising a switch module and an electromagnetic induction module, wherein the switch module is connected to the electromagnetic induction module;

[0005] The switch module is configured to form a transmission channel for a preset alternating current when in an on state, so as to transmit the preset alternating current to the electromagnetic induction module;

[0006] The electromagnetic induction module is used to generate a magnetic field using the preset alternating current and output electromagnetic energy;

[0007] The switch module includes a first submodule and a second submodule;

[0008] The first end of the second submodule is connected to the third end of the first submodule, and the second end of the second submodule is connected to the fourth end of the first submodule;

[0009] The third terminal of the second submodule is used to input a control signal, and the second submodule is used to be in an on state or an off state according to the control signal;

[0010] When the switch module is in an on state, the preset AC current is input through the first end of the first submodule, passes through the second submodule in an on state, and outputs the preset AC current through the second end of the first submodule; or, the preset AC current is input through the second end of the first submodule, passes through the second submodule in an on state, and outputs the preset AC current through the first end of the first submodule.

[0011] Optionally, the first submodule includes a first diode, a second diode, a third diode and a fourth diode;

[0012] The cathode of the first diode serves as the third terminal of the first submodule, and the anode of the first diode is connected to the cathode of the second diode;

[0013] The cathode of the second diode serves as the first end of the first submodule, and the anode of the second diode is connected to the anode of the fourth diode;

[0014] The anode of the third diode serves as the second end of the first submodule, and the cathode of the third diode is connected to the cathode of the first diode;

[0015] The anode of the fourth diode serves as the fourth end of the first submodule, and the cathode of the fourth diode is connected to the anode of the third diode.

[0016] Optionally, the second submodule includes a first switch, a second switch and a first DC power supply;

[0017] A first end of the first switch is connected to the positive electrode of the first DC power supply, a second end of the first switch is connected to the third end of the second switch, and the third end of the first switch is used to input the control signal;

[0018] The first end of the second switch serves as the first end of the second submodule, and the second end of the second switch serves as the second end of the second submodule and is connected to the negative electrode of the first DC power supply.

[0019] Optionally, the electromagnetic induction module includes a first capacitor and a first inductor, the first capacitor is connected in series with the switch module, and the first inductor is connected in series with the switch module.

[0020] The utility model also provides an electromagnetic induction heater, comprising the electromagnetic induction working circuit as described in any one of the above items;

[0021] When a load is detected, an AC current of a resonant frequency corresponding to the load is obtained through a switch module in an on state;

[0022] transmitting the alternating current to the electromagnetic induction module, and outputting electromagnetic energy through the electromagnetic induction module, so that the load is heated by the electromagnetic energy;

[0023] When the load is not detected, the switch module is controlled to be in an off state to stop obtaining the AC current.

[0024] The utility model further provides an electromagnetic induction working circuit, comprising an electromagnetic wave generating unit and a plurality of electromagnetic induction units connected in parallel, each of the electromagnetic induction units comprising the electromagnetic induction working circuit as described in any one of the above items;

[0025] The electromagnetic wave generating unit is connected to each of the electromagnetic induction units respectively, and transmits a power current of a preset frequency to each of the electromagnetic induction units.

[0026] Optionally, the electromagnetic wave generating unit includes a first driving module, a second driving module and a second DC power supply;

[0027] One end of the second DC power supply is connected to the first end of the first driving module and the first end of the second driving module respectively, and the other end of the second DC power supply is connected to the second end of the first driving module and the second end of the second driving module respectively;

[0028] The third end of the first driving module is connected to one end of each of the electromagnetic induction units, and the third end of the second driving module is connected to the other end of each of the electromagnetic induction units.

[0029] Optionally, the first driving module includes a first switching tube, a second switching tube and a first driving sub-module;

[0030] The second driving module includes a third switch tube, a fourth switch tube and a second driving sub-module;

[0031] One end of the first driver submodule is connected to the third end of the first switch tube, and the other end of the first driver submodule is connected to the third end of the second switch tube;

[0032] The first end of the first switching tube serves as the first end of the first driving module, the first end of the second switching tube serves as the second end of the first driving module, and the second end of the second switching tube is connected to the second end of the first switching tube and serves as the third end of the first driving module;

[0033] One end of the second driver submodule is connected to the third end of the third switch tube, and the other end of the second driver submodule is connected to the third end of the fourth switch tube;

[0034] The first end of the third switch tube serves as the first end of the second driving module, the first end of the fourth switch tube serves as the second end of the second driving module, and the second end of the fourth switch tube is connected to the second end of the third switch tube and serves as the third end of the second driving module.

[0035] Optionally, the first driving module includes a fifth switching tube, a sixth switching tube and a third driving sub-module;

[0036] The second driving module includes a second capacitor and a third capacitor;

[0037] One end of the third driver submodule is connected to the third end of the fifth switch tube, and the other end of the third driver submodule is connected to the third end of the sixth switch tube;

[0038] The first end of the fifth switch tube serves as the first end of the first driving module, the first end of the sixth switch tube serves as the second end of the first driving module, and the second end of the sixth switch tube is connected to the second end of the fifth switch tube and serves as the third end of the first driving module;

[0039] One end of the second capacitor serves as the first end of the second driving module, one end of the third capacitor serves as the second end of the second driving module, and the other end of the second capacitor is connected to the other end of the second capacitor and serves as the third end of the second driving module.

[0040] The utility model also provides an induction cooker, comprising the electromagnetic induction working circuit as described in any one of the above items.

[0041] The utility model has at least the following beneficial effects:

[0042] In the present application, the electromagnetic induction module is controlled by the switch module to output electromagnetic energy or stop outputting electromagnetic energy. Specifically, a preset AC current is input through the first end of the first submodule, and a preset AC current is output through the second end of the first submodule, or a preset AC current is input through the second end of the first submodule and a preset AC current is output through the first end of the first submodule, thereby realizing a current structure of bidirectional transmission current, thereby controlling the input and output directions of the AC current, and helping to improve the efficiency and adaptability of the circuit. In addition, the second submodule is used to open or close the path for inputting AC current to the first submodule, thereby controlling whether AC current is input and realizing precise control. It can be seen that the present application does not require additional configuration of an AC power supply, and only needs to control whether an external AC current is input to realize the conversion of electrical energy into electromagnetic energy; when AC currents of different electromagnetic frequencies are input, the input path can be turned off to avoid the frequency difference effect caused by different electromagnetic frequencies, thereby ensuring operation under the same electromagnetic frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] 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.

[0044] Figure 1 It is a schematic diagram of a first circuit structure of an electromagnetic induction working circuit;

[0045] Figure 2 It is a circuit structure diagram of a switch module in an electromagnetic induction working circuit;

[0046] Figure 3 It is a circuit diagram of a switch module in an electromagnetic induction working circuit;

[0047] Figure 4 It is a schematic diagram of a second circuit structure of an electromagnetic induction working circuit;

[0048] Figure 5 It is a schematic diagram of the third circuit structure of an electromagnetic induction working circuit;

[0049] Figure 6 This is a fourth circuit structure schematic diagram of an electromagnetic induction working circuit. DETAILED DESCRIPTION

[0050] 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.

[0051] In the relevant technical field, multi-head electromagnetic induction heaters are primarily used in multi-head induction cookers, which are currently a trending development. A multi-head induction cooker is a modern cooker with multiple induction burners on a single heating surface. The induction burners in these multi-head cookers have complex circuit designs, requiring each burner to be configured with a different electromagnetic frequency. When multiple induction burners operate simultaneously, the power ratings of the burners vary, the cookware used may not be identical, and the manufacturing processes of components such as the electromagnetic heating coils, which primarily generate the electromagnetic energy field, may not be identical. All of these factors result in the electromagnetic frequencies of the magnetic fields generated by each burner varying. Because each burner generates a different electromagnetic frequency, the superposition of these different frequencies generates electromagnetic waves at difference frequencies. Therefore, when the difference frequencies are within the human hearing range, these electromagnetic waves can cause severe noise disturbances.

[0052] It's understandable that the theoretical basis for difference frequency generation is derived from Maxwell's equations, which allow us to derive the fundamental equations for magnetic field interactions. Experiments have shown that the greater the magnetic field intensity, the greater the amplitudes of the sum and difference frequency components; the smaller the frequency difference, the larger the amplitude of the difference frequency component. Phase differences, however, affect the phase relationship between the sum and difference frequency components.

[0053] In order to prevent the difference frequency noise caused by the interaction of electromagnetic fields of different frequencies, there are currently two solutions:

[0054] 1. Keep the electromagnetic coils as far apart as possible, including the cookware to be heated, and use magnetic and electrical isolation measures between the electromagnetic coils to minimize the electromagnetic interaction between them.

[0055] Second, through computer and other measurement control, the operating frequencies of two (including multiple) electromagnetic coils are kept as close as possible, and as completely consistent as possible, so that they do not generate electromagnetic wave difference frequency waves, thereby avoiding these waves from causing noise disturbance to the human ear.

[0056] Both of the above methods have disadvantages:

[0057] The first method uses distance isolation, which limits its application in many places. Now many occasions require several coils to work in close proximity. Some occasions even require several coils to be very close to each other to heat a container at the same time, such as a relatively large baking tray, heating of multiple liquids with different recipes (shuangyan pot, mother-and-child pot, multi-flavor pot, nine-palace pot in hot pot), etc.

[0058] The second disadvantage is that the operating frequencies of several electromagnetic induction stoves that heat simultaneously need to be consistent, which is very difficult to control, or to say, very difficult to select. This is because the materials of the pots and pans are different, the working heating power is also different, and so on, which will cause the resonant frequencies to be different. This also limits many application requirements. For example, we sometimes need several stoves with different firepowers, and sometimes we need several heating utensils of different materials as cooking utensils. The problem of difference frequency noise seriously affects the application of multi-head induction cookers.

[0059] To address the above-mentioned issues, the principle of the present invention is to use an electromagnetic energy generator with a unified operating frequency, and to distribute the power to each burner using a high-frequency switch in a high-speed time-sharing manner. This high-speed time-sharing on-off method is used to meet different heating power requirements and cookware materials. To implement the present invention's technical solution, the present invention provides the following embodiments.

[0060] Please refer to Figure 1 , Figure 1 The present invention is a first circuit structure schematic diagram of an electromagnetic induction working circuit.

[0061] In a first aspect, this embodiment provides an electromagnetic induction working circuit, including a switch module and an electromagnetic induction module, wherein the switch module is connected to the electromagnetic induction module.

[0062] The switch module is used to form a transmission channel for a preset alternating current when in an on state, so that the preset alternating current is transmitted to the electromagnetic induction module.

[0063] The electromagnetic induction module is used to generate a magnetic field using a preset alternating current and output electromagnetic energy.

[0064] Please refer to Figure 2 , Figure 2 The present invention is a circuit structure diagram of a switch module in an electromagnetic induction working circuit.

[0065] In some embodiments, the switch module includes a first submodule and a second submodule.

[0066] The first end of the second submodule is connected to the third end of the first submodule, and the second end of the second submodule is connected to the fourth end of the first submodule; the third end of the second submodule is used to input a control signal, and the second submodule is used to be in an on state or an off state according to the control signal; when the switch module is in the on state, a preset AC current is input through the first end of the first submodule, passes through the second submodule in the on state, and outputs the preset AC current through the second end of the first submodule, or, a preset AC current is input through the second end of the first submodule, passes through the second submodule in the on state, and outputs the preset AC current through the first end of the first submodule.

[0067] It can be understood that the AC current is input through the first terminal of the first submodule, passes through the third terminal of the first submodule, the first terminal and the second terminal of the second submodule, and the fourth terminal of the first submodule in sequence, and is then output through the second terminal of the first submodule; alternatively, the AC current is input through the second terminal of the first submodule, passes through the third terminal of the first submodule, the first terminal and the second terminal of the second submodule, and the fourth terminal of the first submodule in sequence, and is then output through the first terminal of the first submodule.

[0068] In some embodiments, the first submodule includes a first diode, a second diode, a third diode and a fourth diode; the cathode of the first diode serves as the third end of the first submodule, and the anode of the first diode is connected to the cathode of the second diode; the cathode of the second diode serves as the first end of the first submodule, and the anode of the second diode is connected to the anode of the fourth diode; the anode of the third diode serves as the second end of the first submodule, and the cathode of the third diode is connected to the cathode of the first diode; the anode of the fourth diode serves as the fourth end of the first submodule, and the cathode of the fourth diode is connected to the anode of the third diode.

[0069] In some embodiments, the first diode, the second diode, the third diode, and the fourth diode are all high-frequency fast diodes or fast recovery diodes.

[0070] In some embodiments, the second submodule includes a first switch, a second switch, and a first DC power supply; the first end of the first switch is connected to the positive electrode of the first DC power supply, the second end of the first switch is connected to the third end of the second switch, and the third end of the first switch is used to input a control signal; the first end of the second switch serves as the first end of the second submodule, and the second end of the second switch serves as the second end of the second submodule and is connected to the negative electrode of the first DC power supply.

[0071] In some embodiments, the second switch is a DC high-power device, which may be a high-power transistor, a MOSFET tube, or an IGBT.

[0072] Please refer to Figure 3 , Figure 3 The present invention is a circuit diagram of a switch module in an electromagnetic induction working circuit.

[0073] In this embodiment, the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 are all high-speed power diodes. These four high-speed power diodes form a diode bridge, allowing bidirectional, high-frequency, and high-current flow between the first terminal A of the first submodule and the second terminal B of the first submodule. A DC path is formed between the third terminal C of the first submodule and the fourth terminal D of the first submodule, where the third terminal C of the first submodule is the positive terminal and the first terminal D of the fourth submodule is the negative terminal. A second switch Q1 is connected across CD. The second switch Q1 is a power switch connected to a DC power supply DC. When the DC power supply DC provides a voltage to the second switch Q1 through the first switch K1, the second switch Q1 is in the on state. When the second switch Q1 is in the on state, when the AC current is a positive half-wave, the AC current starts from point A of the bridge arm, passes through the first diode D1 and reaches bridge arm C. At this time, the AC current is connected to bridge arm D through the second switch Q1, and then passes through the fourth diode D4 and is output through the second terminal B of the first submodule, forming a positive half-wave loop. When the AC current is a negative half-wave, the AC current starts from point B of the bridge arm, passes through the third diode D3 and reaches bridge arm C. At this time, the AC current is also connected to bridge arm D through the second switch Q1, and then passes through the second diode D2 and is output through the first terminal A of the first submodule, forming a negative half-wave loop.

[0074] When the first switch K1 is turned off and the DC voltage is stopped from being supplied to the second switch Q1, the second switch Q1 has no driving power supply and is in the off state. At this time, there is no path between the C end and the D end of the bridge arm, and the AC current has no path and cannot be input.

[0075] It can be understood that the diodes D1, D2, D3, D4 and the switch tube Q1 all use components that can be quickly switched on and off. When the switching rate and power of the components are sufficient, they can transmit high-frequency energy and can simply and controlledly switch at high speed, while meeting the requirements of reducing losses, simple structure and easy manufacturing.

[0076] In some embodiments, the electromagnetic induction module includes a first capacitor and a first inductor, the first capacitor is connected in series with the switch module, and the first inductor is connected in series with the switch module.

[0077] In some embodiments, one end of the first capacitor is used to input or output AC current, and the other end of the first capacitor is connected to one end of the switch module; one end of the first inductor is used to input or output AC current, and the other end of the first inductor is connected to the other end of the switch module.

[0078] In some embodiments, one end of the first capacitor is connected to one end of the first inductor, and the other end of the first capacitor is connected to one end of the switch module; the other end of the first inductor is used to input or output AC current, and the other end of the switch module is used to input or output AC current.

[0079] In some embodiments, one end of the first capacitor is used to input or output AC current, and the other end of the first capacitor is connected to one end of the first inductor; the other end of the first inductor is connected to one end of the switch module, and the other end of the switch module is used to input or output AC current.

[0080] In some embodiments, one end of the first capacitor is connected to one end of the first inductor, and the other end of the first capacitor is connected to the other end of the first inductor, that is, the first capacitor and the first inductor are connected in parallel; the switch module is connected to the parallel first capacitor and first inductor.

[0081] In the second aspect, this embodiment provides an electromagnetic induction heater, comprising an electromagnetic induction working circuit as in any of the above embodiments; when a load is detected, an AC current of a resonant frequency corresponding to the load is obtained through a switch module in an on state; the AC current is transmitted to the electromagnetic induction module, and electromagnetic energy is output through the electromagnetic induction module so that the load is heated by the electromagnetic energy; when no load is detected, the switch module is controlled to be in an off state to stop obtaining the AC current.

[0082] In one specific embodiment, a load detection sensor is installed to monitor in real time whether a load is connected to the electromagnetic induction heating system. The sensor is connected to a control system and sends a signal to the control system when a load is detected. The switch module consists of a first submodule and a second submodule, with the second submodule receiving a control signal from the control system. The control system controls the switching state of the second submodule based on the sensor signal. When a load is detected, the control system sends a signal to turn the second submodule on. The system also includes a built-in frequency analyzer to analyze the resonant frequency of the load. When a load is detected, the frequency analyzer activates and determines the corresponding resonant frequency of the load. Based on the resonant frequency of the load, the control system adjusts the frequency of the AC current to match the resonant frequency of the load. When the switch module is on, it allows a preset AC current to flow. The current enters through the first submodule, passes through the second submodule, and is output through the first submodule. The adjusted AC current is transmitted to the electromagnetic induction module, which uses this current to generate a high-frequency electromagnetic field. The electromagnetic field generates eddy currents in the load (metal cooking utensils, such as an iron pan), resulting in heating. When the load detection sensor does not detect a load, it sends a signal to the control system. After receiving the no-load signal, the control system controls the second submodule to be in a shut-off state, and stops supplying current.

[0083] In a third aspect, this embodiment provides an electromagnetic induction working circuit, comprising an electromagnetic wave generating unit and a plurality of electromagnetic induction units connected in parallel, each electromagnetic induction unit comprising an electromagnetic induction working circuit as described in any one of the above items; the electromagnetic wave generating unit is respectively connected to each electromagnetic induction unit, and transmits a power current of a preset frequency to each electromagnetic induction unit.

[0084] In this embodiment, when the switch module of an electromagnetic induction unit connected in series with the load is in the on state, the high-frequency and high-power current output by the electromagnetic wave generating unit outputs electromagnetic induction heating to the load current through the electromagnetic induction unit.

[0085] When the switch module of the electromagnetic induction unit connected in series with a load is in the off state, the high-frequency and high-power current output by the electromagnetic wave generating unit is blocked by the electromagnetic induction unit, and the load has no high-frequency current and no electromagnetic induction heating output.

[0086] The electromagnetic induction unit is controlled in microseconds to switch the load at high speed, so as to control the output power of each load from small to large or stop it completely.

[0087] As you can understand, because a single electromagnetic wave generating unit is used, the electromagnetic induction heating frequency output to each load is consistent, avoiding the sum and difference half-frequency fluctuations caused by different operating frequencies. Because of the high-speed time-sharing switching from microseconds to milliseconds, the output power of each load can be controlled steplessly while also avoiding the noise generated by switching.

[0088] It will be appreciated that in this embodiment, a single electromagnetic wave generating unit is used to simultaneously drive two, or more, or even multiple electromagnetic induction units, transmitting a power current of a preset frequency to each electromagnetic induction unit. This ensures that the entire electromagnetic induction circuit operates at a single electromagnetic frequency, thus avoiding the frequency difference effect caused by different electromagnetic frequencies. Furthermore, since only the frequency of the AC current output by a single electromagnetic wave generating unit needs to be controlled, it is easier to control the electromagnetic frequency of each electromagnetic induction unit in the electromagnetic induction circuit.

[0089] In some embodiments, the electromagnetic wave generating unit is an AC power supply; one end of the AC power supply is connected to one end of each electromagnetic induction unit, and the other end of the AC power supply is connected to the other end of each electromagnetic induction unit.

[0090] In some embodiments, the AC power supply is an electromagnetic wave generating unit with adjustable frequency and power, the minimum frequency is greater than 20 kHz, and the high frequency can reach above 200 kHz; the first inductor and the first capacitor constitute an LC resonant circuit, wherein the first inductor is also the electromagnetic output coil of electromagnetic heating, commonly known as a coil disk, the LC resonant circuit and the load (the heated cookware, such as a pot pot) constitute an electromagnetic induction heating load, and the heated pot pot is generally placed near the first inductor.

[0091] Please refer to Figure 4 , Figure 4 The present invention is a schematic diagram of a second circuit structure of an electromagnetic induction working circuit.

[0092] In some embodiments, the electromagnetic wave generating unit includes a first driving module, a second driving module and a second DC power supply; one end of the second DC power supply is respectively connected to the first end of the first driving module and the first end of the second driving module, and the other end of the second DC power supply is respectively connected to the second end of the first driving module and the second end of the second driving module; the third end of the first driving module is respectively connected to one end of each electromagnetic induction unit, and the third end of the second driving module is respectively connected to the other end of each electromagnetic induction unit.

[0093] In this embodiment, a bridge-type working circuit is adopted. A bridge-type electromagnetic wave generating unit of the same frequency drives a plurality of electromagnetic induction units. Similarly, the electromagnetic induction units can be turned on and off in time-sharing manner to control the output of electromagnetic energy.

[0094] Please refer to Figure 5 , Figure 5 The third circuit structure diagram of an electromagnetic induction working circuit is shown.

[0095] In some embodiments, the first driving module includes a first switching tube, a second switching tube and a first driving sub-module; the second driving module includes a third switching tube, a fourth switching tube and a second driving sub-module; one end of the first driving sub-module is connected to the third end of the first switching tube, and the other end of the first driving sub-module is connected to the third end of the second switching tube; the first end of the first switching tube serves as the first end of the first driving module, the first end of the second switching tube serves as the second end of the first driving module, and the second end of the second switching tube is connected to the second end of the first switching tube and serves as the third end of the first driving module; one end of the second driving sub-module is connected to the third end of the third switching tube, and the other end of the second driving sub-module is connected to the third end of the fourth switching tube; the first end of the third switching tube serves as the first end of the second driving module, the first end of the fourth switching tube serves as the second end of the second driving module, and the second end of the fourth switching tube is connected to the second end of the third switching tube and serves as the third end of the second driving module.

[0096] In this embodiment, four high-power switch tubes, namely the first switch tube q1, the second switch tube q2, the third switch tube q3, and the fourth switch tube q4, form a bridge circuit, which outputs the power energy required for electromagnetic heating under the drive of the first driver submodule and the second driver submodule respectively.

[0097] Multiple electromagnetic induction units can heat multiple vessels POT (electromagnetic induction heating load). Under the control of high-frequency switches, multiple electromagnetic induction units can output simultaneously or in time-sharing mode. The output power of each electromagnetic induction unit can also be controlled according to the different time-sharing outputs, thus achieving the requirement of multiple outputs from a set of electromagnetic wave generating units with the same frequency.

[0098] In some embodiments, when used on an induction cooker, the load is a civilian heating product, and the power generated by the electromagnetic wave generating unit is generally required to be above 100 watts and the frequency generated is above 20 kHz. Therefore, the switching performance and high-frequency AC passing performance of the switch module of the electromagnetic induction unit are also required to be above 20 kHz.

[0099] Please refer to Figure 6 , Figure 6 This is a fourth circuit structure schematic diagram of an electromagnetic induction working circuit.

[0100] In some embodiments, the first driving module includes a fifth switching tube, a sixth switching tube, and a third driving sub-module; the second driving module includes a second capacitor and a third capacitor; one end of the third driving sub-module is connected to the third end of the fifth switching tube, and the other end of the third driving sub-module is connected to the third end of the sixth switching tube; the first end of the fifth switching tube serves as the first end of the first driving module, the first end of the sixth switching tube serves as the second end of the first driving module, and the second end of the sixth switching tube is connected to the second end of the fifth switching tube and serves as the third end of the first driving module; one end of the second capacitor serves as the first end of the second driving module, one end of the third capacitor serves as the second end of the second driving module, and the other end of the second capacitor is connected to the other end of the second capacitor and serves as the third end of the second driving module.

[0101] It can be understood that this embodiment uses the same electromagnetic wave generating unit to achieve a uniform oscillation frequency; an electromagnetic induction unit is used between the electromagnetic wave generating unit and each load, allowing the high-frequency and high-power electromagnetic induction heating current to be passed through or shut off; the electromagnetic induction unit can perform high-speed switching control at the microsecond to millisecond level; the electromagnetic induction unit has a simple structure, is easy to manufacture and has extremely low loss.

[0102] In a fourth aspect, this embodiment provides an induction cooker, comprising any one of the above electromagnetic induction working circuits.

[0103] It can be understood that in any of the above embodiments, the electromagnetic induction module is controlled by the switch module to output electromagnetic energy or stop outputting electromagnetic energy. Specifically, a preset AC current is input through the first end of the first submodule, and a preset AC current is output through the second end of the first submodule, or a preset AC current is input through the second end of the first submodule and a preset AC current is output through the first end of the first submodule, thereby realizing a current structure of bidirectional transmission current, thereby controlling the input and output directions of the AC current, and helping to improve the efficiency and adaptability of the circuit. In addition, the second submodule is used to open or close the path for inputting AC current into the first submodule, thereby controlling whether AC current is input and achieving precise control. It can be seen that the present application solution does not require additional configuration of an AC power supply, and only needs to control whether an external AC current is input to realize the conversion of electrical energy into electromagnetic energy; when AC currents of different electromagnetic frequencies are input, the input path can be turned off to avoid the frequency difference effect caused by different electromagnetic frequencies, thereby ensuring operation under the same electromagnetic frequency.

[0104] 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.

[0105] 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.

[0106] 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. An electromagnetic induction working circuit, characterized in that: It includes a switch module and an electromagnetic induction module, wherein the switch module is connected to the electromagnetic induction module; The switch module is configured to form a transmission channel for a preset alternating current when in an on state, so as to transmit the preset alternating current to the electromagnetic induction module; The electromagnetic induction module is used to generate a magnetic field using the preset alternating current and output electromagnetic energy; The switch module includes a first submodule and a second submodule; The first end of the second submodule is connected to the third end of the first submodule, and the second end of the second submodule is connected to the fourth end of the first submodule; The third terminal of the second submodule is used to input a control signal, and the second submodule is used to be in an on state or an off state according to the control signal; When the switch module is in an on state, the preset AC current is input through the first end of the first submodule, passes through the second submodule in an on state, and outputs the preset AC current through the second end of the first submodule; or, the preset AC current is input through the second end of the first submodule, passes through the second submodule in an on state, and outputs the preset AC current through the first end of the first submodule.

2. The electromagnetic induction working circuit according to claim 1, characterized in that: The first submodule includes a first diode, a second diode, a third diode and a fourth diode; The cathode of the first diode serves as the third terminal of the first submodule, and the anode of the first diode is connected to the cathode of the second diode; The cathode of the second diode serves as the first end of the first submodule, and the anode of the second diode is connected to the anode of the fourth diode; The anode of the third diode serves as the second end of the first submodule, and the cathode of the third diode is connected to the cathode of the first diode; The anode of the fourth diode serves as the fourth end of the first submodule, and the cathode of the fourth diode is connected to the anode of the third diode.

3. The electromagnetic induction working circuit according to claim 1, characterized in that: The second submodule includes a first switch, a second switch and a first DC power supply; A first end of the first switch is connected to the positive electrode of the first DC power supply, a second end of the first switch is connected to the third end of the second switch, and the third end of the first switch is used to input the control signal; The first end of the second switch serves as the first end of the second submodule, and the second end of the second switch serves as the second end of the second submodule and is connected to the negative electrode of the first DC power supply.

4. The electromagnetic induction working circuit according to claim 1, characterized in that: The electromagnetic induction module includes a first capacitor and a first inductor. The first capacitor is connected in series with the switch module, and the first inductor is connected in series with the switch module.

5. An electromagnetic induction heater, characterized in that: comprising the electromagnetic induction working circuit according to any one of claims 1 to 4; When a load is detected, an AC current of a resonant frequency corresponding to the load is obtained through a switch module in an on state; transmitting the alternating current to the electromagnetic induction module, and outputting electromagnetic energy through the electromagnetic induction module, so that the load is heated by the electromagnetic energy; When the load is not detected, the switch module is controlled to be in an off state to stop obtaining the AC current.

6. An electromagnetic induction working circuit, characterized in that: It comprises an electromagnetic wave generating unit and a plurality of electromagnetic induction units connected in parallel, each of the electromagnetic induction units comprising the electromagnetic induction working circuit according to any one of claims 1 to 4; The electromagnetic wave generating unit is connected to each of the electromagnetic induction units respectively, and transmits a power current of a preset frequency to each of the electromagnetic induction units.

7. The electromagnetic induction working circuit according to claim 6, characterized in that: The electromagnetic wave generating unit includes a first driving module, a second driving module and a second DC power supply; One end of the second DC power supply is connected to the first end of the first driving module and the first end of the second driving module respectively, and the other end of the second DC power supply is connected to the second end of the first driving module and the second end of the second driving module respectively; The third end of the first driving module is connected to one end of each of the electromagnetic induction units, and the third end of the second driving module is connected to the other end of each of the electromagnetic induction units.

8. The electromagnetic induction working circuit according to claim 7, characterized in that: The first driving module includes a first switching tube, a second switching tube and a first driving sub-module; The second driving module includes a third switch tube, a fourth switch tube and a second driving sub-module; One end of the first driver submodule is connected to the third end of the first switch tube, and the other end of the first driver submodule is connected to the third end of the second switch tube; The first end of the first switching tube serves as the first end of the first driving module, the first end of the second switching tube serves as the second end of the first driving module, and the second end of the second switching tube is connected to the second end of the first switching tube and serves as the third end of the first driving module; One end of the second driver submodule is connected to the third end of the third switch tube, and the other end of the second driver submodule is connected to the third end of the fourth switch tube; The first end of the third switch tube serves as the first end of the second driving module, the first end of the fourth switch tube serves as the second end of the second driving module, and the second end of the fourth switch tube is connected to the second end of the third switch tube and serves as the third end of the second driving module.

9. The electromagnetic induction working circuit according to claim 7, characterized in that: The first driving module includes a fifth switching tube, a sixth switching tube and a third driving sub-module; The second driving module includes a second capacitor and a third capacitor; One end of the third driver submodule is connected to the third end of the fifth switch tube, and the other end of the third driver submodule is connected to the third end of the sixth switch tube; The first end of the fifth switch tube serves as the first end of the first driving module, the first end of the sixth switch tube serves as the second end of the first driving module, and the second end of the sixth switch tube is connected to the second end of the fifth switch tube and serves as the third end of the first driving module; One end of the second capacitor serves as the first end of the second driving module, one end of the third capacitor serves as the second end of the second driving module, and the other end of the second capacitor is connected to the other end of the second capacitor and serves as the third end of the second driving module.

10. An induction cooker, characterized in that: The electromagnetic induction working circuit comprises the electromagnetic induction working circuit as claimed in any one of claims 6 to 9.

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