CN204539511U - Cooking apparatus and the electromagnetic heater for cooking apparatus - Google Patents

Abstract

The utility model discloses a cooking utensil and an electromagnetic heating device for the cooking utensil. The electric heating device comprises: an interactive interface; a power supply module; a resonant switch tube; a resonant module, which includes a first resonant coil and an inductance for changing the resonant inductance A switching unit, a capacitance switching unit for changing the resonant capacitance, and a first resonant capacitor, wherein the first resonant coil is connected in series with the inductance switching unit and then connected to the collector of the resonant switch tube, and the first resonant capacitor is connected in parallel to the resonant switch tube Between the collector and emitter of the capacitor, the capacitor switching unit is connected in parallel with the first resonant capacitor; the controller connected to the control pole of the resonant switching tube, the capacitor switching unit and the inductance switching unit respectively controls the resonant switching tube, The capacitance switching unit and the inductance switching unit are controlled to change the heating power of the electromagnetic heating device. Therefore, by changing the resonance parameters of the resonance circuit, the power range of continuous heating is expanded, and the cooking effect is improved.

Description

Cooking appliance and electromagnetic heating device for cooking appliance

technical field

The invention relates to the technical field of living appliances, in particular to a cooking appliance and an electric heating device for the cooking appliance.

Background technique

The output power of the relevant electromagnetic heating device is usually relatively large, generally as high as more than 2,000 watts. In the related art, the electromagnetic heating device generally uses an LC resonant circuit for heating, so as to reduce the loss of the IGBT tube. For the LC resonant circuit, the voltage of the C pole (collector) of the IGBT tube is the superposition of the resonant voltage and the rectified mains voltage. When the IGBT tube is turned on, the resonant coil absorbs energy; when the IGBT tube is turned off, in addition to most of the energy being transmitted to the pot, there is also a part of inertial energy that reverse charges the resonant capacitor, causing the voltage of the C pole of the IGBT tube to drop.

Therefore, when the heating power is large, the conduction time of the IGBT tube is long, the current of the resonant coil is large, and its inertial energy is also large, which is enough to make the voltage of the C pole drop to 0 volts, and the IGBT tube is in a soft open state when it is turned on again , the IGBT tube loss is small; however, when the heating power is small, due to the short conduction time of the IGBT tube, the energy absorbed by the resonant coil is small, the current of the resonant coil is small, and its inertial energy is also small, so that the voltage of the C pole cannot be reduced to 0 volts, the IGBT tube is in a hard-on state when it is turned on again, and the loss of the IGBT tube increases. The disadvantage of this related technology is that the electromagnetic heating device can only continuously heat in a narrow power range, such as 1000W-2000W. When the heating power is lower than 1000W, continuous heating cannot be realized due to the large loss and temperature rise of the IGBT tube. Low-power heating can only be realized by means of intermittent heating, but the cooking effect of intermittent intermittent heating is poor and cannot meet the needs of users.

Therefore, there is a need for improvement in the related art.

Contents of the invention

The utility model aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, an object of the present utility model is to provide an electric heating device for a cooking utensil, which can perform continuous heating in a wide frequency range.

Another object of the utility model is to provide a cooking utensil.

In order to achieve the above purpose, an electric heating device for a cooking appliance proposed in an embodiment of the present invention includes: an interactive interface for receiving user instructions; a power supply module; a resonant switch tube; a resonant module, the resonant module includes a first A resonant coil, an inductance switching unit for changing the resonant inductance, a capacitance switching unit for changing the resonant capacitance, and a first resonant capacitor, wherein the first resonant coil is connected in series with the inductance switching unit and connected to the The collector of the resonant switch tube is connected, the first resonant capacitor is connected in parallel between the collector and the emitter of the resonant switch tube, and the capacitance switching unit is connected in parallel with the first resonant capacitor; the controller, the The controller is respectively connected to the control pole of the resonant switching tube, the capacitor switching unit and the inductance switching unit, and the controller controls the resonant switching tube and the capacitor switching unit respectively according to the user’s instruction. and the inductance switching unit are controlled to change the heating power of the electromagnetic heating device.

According to the electromagnetic heating device for cooking utensils proposed by the utility model, the first resonant coil is connected in series with the inductance switching unit for changing the resonant inductance and then connected with the collector of the resonant switch tube, and the first resonant capacitor is connected in parallel with the resonant switch Between the collector and the emitter of the tube, the capacitance switching unit for changing the resonant capacitance is connected in parallel with the first resonant capacitor, and the resonant switching tube, the capacitance switching unit and the inductance switching unit are respectively controlled by the controller to change the electromagnetic The heating power of the heating device. Therefore, the resonance mode of the electromagnetic heating device can be adjusted by opening or closing the capacitance switching unit and the inductance switching unit, thereby changing the resonance parameters of the resonance circuit, expanding the heating power range of continuous heating, and making the electromagnetic heating device operate at a higher power and Even lower power can achieve continuous heating, improve the cooking effect, improve the user's cooking experience, and ensure the reliability of the electromagnetic heating device to avoid damage to the IGBT tube.

Specifically, the inductance switching unit includes a second resonant coil and a first controllable switch connected in parallel, wherein a control terminal of the first controllable switch is connected to the controller.

Specifically, the capacitance switching unit includes a second resonant capacitor and a second controllable switch connected in series, wherein a control terminal of the second controllable switch is connected to the controller.

Preferably, the first controllable switch and the second controllable switch may be relays, IGBTs, MOS transistors or thyristors.

Wherein, when the user's instruction is a high-power heating instruction, the controller controls both the first controllable switch and the second controllable switch to be in a closed state; when the user's instruction is a medium-power heating Instruction, the controller controls the first controllable switch to be in the closed state and the second controllable switch to be in the open state, or the controller controls the first controllable switch to be in the open state and the The second controllable switch is in a closed state; when the user's instruction is a low-power heating instruction, the controller controls both the first controllable switch and the second controllable switch to be in an off state.

Further, when both the first controllable switch and the second controllable switch are in the closed state, the first resonant capacitor and the second resonant capacitor are connected in parallel and connected in series with the first resonant coil to perform Resonant work; when the first controllable switch is in the closed state and the second controllable switch is in the open state, the first resonant coil is connected in series with the first resonant capacitor to perform resonant work; when the When the first controllable switch is in the open state and the second controllable switches are in the closed state, the first resonant capacitor and the second resonant capacitor are connected in parallel with the first resonant coil, the second The resonant coil is connected in series to perform resonant work; when the first controllable switch and the second controllable switch are both in the off state, the first resonant coil and the second resonant coil are connected in series and then connected to the The first resonant capacitor is connected in series for resonant operation.

Preferably, the resonant switch tube is an IGBT.

Specifically, the power module includes: a rectifier bridge stack, the rectifier bridge stack has a first input terminal and a second input terminal, a first output terminal and a second output terminal; a first capacitor, the first capacitor is connected in parallel Between the first input end and the second input end of the rectifier bridge stack; LC filter circuit, the LC filter circuit is connected between the first output end and the second output end of the rectifier bridge stack.

In order to achieve the above object, another aspect of the utility model proposes a cooking appliance, which includes the electromagnetic heating device.

According to the cooking utensil proposed by the utility model, the resonant mode of the electromagnetic heating device can be adjusted through the electric heating device, thereby changing the resonance parameter of the resonant circuit, expanding the heating power range of continuous heating, and making the cooking utensil operate at higher power and lower power. It can realize continuous heating, improve the cooking effect, improve the user's cooking experience, and can ensure the reliability of cooking utensils and avoid damage to IGBT tubes.

Description of drawings

1 is a schematic block diagram of an electromagnetic heating device for cooking utensils according to an embodiment of the present invention; and

Fig. 2 is a schematic circuit diagram of an electromagnetic heating device for a cooking appliance according to an embodiment of the present invention.

Reference signs:

The interactive interface 10, the power module 20, the resonant switching tube 30, the resonant module 40, the controller 50, the first resonant coil L1, the inductance switching unit 401, the capacitance switching unit 402, the first resonant capacitor C1, the second resonant coil L2, the first A controllable switch K1, a second resonant capacitor C2, a second controllable switch K2, a rectifier bridge stack 201, a first capacitor C3, an LC filter circuit 202, a filter inductor L3 and a filter capacitor C4.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

The cooking utensil of the air conditioner and the electric heating device for the cooking utensil according to the embodiment of the utility model will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic circuit diagram of an electromagnetic heating device for cooking utensils according to an embodiment of the present invention. As shown in FIG. 1 , the electromagnetic heating device for cooking utensils in the embodiment of the present invention includes: an interactive interface 10 , a power module 20 , a resonant switch tube 30 , a resonant module 40 and a controller 50 .

Among them, the interactive interface 10 is used to receive user instructions; the power module 20 is used to supply power to the resonance module 40, specifically, the power module 20 can be used for rectification and filtering of AC power such as 220V mains power to output rectified and filtered DC power.

The emitter of the resonant switch tube 30 is grounded. According to a specific example of the present invention, the resonant switch tube 30 can be an IGBT (Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor); the resonant module 40 includes a first resonant coil L1, an inductor The switching unit 401, the capacitance switching unit 402 and the first resonant capacitor C1, the inductance switching unit 401 is used to change the resonant inductance, the capacitance switching unit 402 is used to change the resonant capacitance, wherein the first resonant coil L1 is connected in series with the inductance switching unit 401 After being connected, it is connected to the collector of the resonant switch 30 , the first resonant capacitor C1 is connected in parallel between the collector and the emitter of the resonant switch 30 , and the capacitance switching unit 402 is connected in parallel to the first resonant capacitor C1 .

The controller 50 is connected to the interactive interface 10, the control pole of the resonant switching tube 30, the capacitor switching unit 402 and the inductance switching unit 401 respectively, and the controller 50 controls the resonant switching tube 30, the capacitor switching unit 402 and the inductance switching unit respectively according to the user's instruction. 401 controls to change the heating power of the electromagnetic heating device. Further, the electromagnetic heating device may further include a drive circuit for driving the resonant switch tube 30 to be opened or closed, and the drive circuit is connected between the controller 50 and the control pole of the resonant switch tube 30 .

That is to say, the controller 50 can output a PWM (Pulse Width Modulation, pulse width modulation) control signal to the driving circuit to control the opening or closing of the resonant switch tube 30 . Moreover, the controller 50 can also output another two control signals to the capacitance switching unit 402 and the inductance switching unit 401 to drive the capacitance switching unit 402 and the inductance switching unit 401 to open or close.

It should be noted that the controller 50 can pre-store the relationship between the heating power and the conduction time, and the controller 50 can control the conduction time of the resonant switch tube 30 according to the heating power. The larger the heating power, the longer the conduction time, and the heating power The smaller the value, the shorter the on-time. Moreover, the controller 50 may receive an instruction input by a user through an interactive interface to obtain heating power.

Specifically, the controller 50 can obtain the heating frequency gear of the electromagnetic cooker in real time, and control the conduction time of the resonant switch tube 30 according to the heating frequency gear, and also control the capacitor switching unit 402 according to the heating frequency gear And the inductance switching unit 401 is disconnected or closed to select the appropriate resonance parameters, so that the resonant switch tube 30 works best at each heating frequency gear, and widens the heating power range of continuous heating, for example, it can be realized at 200W Continuous heating within the range of 2000W.

Therefore, the resonance mode of the electromagnetic heating device can be adjusted by opening or closing the capacitance switching unit and the inductance switching unit, thereby changing the resonance parameters of the resonance circuit, expanding the heating power range of continuous heating, and making the electromagnetic heating device operate at a higher power and Even lower power can achieve continuous heating, improve the cooking effect, improve the user's cooking experience, and ensure the reliability of the electromagnetic heating device to avoid damage to the IGBT tube.

According to a specific example of the present utility model, the controller 50 may be an MCU (Micro Control Unit, microcontroller).

According to a specific embodiment of the utility model, as shown in FIG. 2, the inductance switching unit 401 may include a second resonant coil L2 and a first controllable switch K1, wherein the second resonant coil L2 and the first controllable switch K1 are connected in parallel , the control end of the first controllable switch K1 is connected to the controller 50 .

Moreover, the capacitance switching unit 402 includes a second resonant capacitor C2 and a second controllable switch K2, wherein the second resonant capacitor C2 and the second controllable switch K2 can be connected in series, and the control terminal of the second controllable switch K2 is connected to the controller 50 connected.

Specifically, the resonance module 40 can work in a series resonance mode. As shown in Figure 2, the first end of the first resonant coil L1 is connected to the power module 20, the second end of the first resonant coil L1 is connected to the first end of the second resonant coil L2, and the second end of the second resonant coil L2 terminals are respectively connected to the collector of the resonant switch tube 30, the first end of the first resonant capacitor C1 and the first end of the second resonant capacitor C2, and the second end of the second resonant capacitor C2 is connected to the first end of the second controllable switch K2 One end is connected, the second end of the second controllable switch K2 is connected to the second end of the first resonant capacitor C1 and then grounded, wherein there is a first node between the first resonant coil L1 and the second resonant coil L2, the second There is a second node between the resonant coil L2 and the second resonant capacitor C2, the first end of the first controllable switch K1 is connected to the first node, and the second end of the first controllable switch K1 is connected to the second node.

According to a specific embodiment of the present invention, the first controllable switch K1 and the second controllable switch K2 can be relays, IGBTs, MOS (metal-oxide-semiconductor, metal-oxide-semiconductor) tubes or thyristors.

Further, when both the first controllable switch K1 and the second controllable switch K2 are in the closed state, the first resonant capacitor C1 and the second resonant capacitor C2 are connected in parallel and then connected in series with the first resonant coil L1 to perform resonant work; when the second When the first controllable switch K1 is in the closed state and the second controllable switch K2 is in the open state, the first resonant coil L1 is connected in series with the first resonant capacitor C1 to perform resonant operation; when the first controllable switch K1 is in the open state and When the second controllable switch K2 is in the closed state, the first resonant capacitor C1 and the second resonant capacitor C2 are connected in parallel and connected in series with the first resonant coil L1 and the second resonant coil L2 to perform resonant work; when the first controllable switch L1 When both the second controllable switch K2 and the second controllable switch K2 are in the off state, the first resonant coil L1 is connected in series with the second resonant coil L2 and then connected in series with the first resonant capacitor C1 to perform resonant operation.

That is to say, when the controller 50 controls the first controllable switch K1 and the second controllable switch K2 to close, the second resonant coil L2 is short-circuited and does not participate in resonance, and only the first resonant coil L1, the first resonant capacitor C1 and The second resonance capacitor C2 participates in resonance. During the resonance process, when the controller 50 controls the resonant switch tube 30 to close, the first resonant coil L1 is charged; C1 and the second resonant capacitor C2 oscillate, and the first resonant coil L1 charges the parallel first resonant capacitor C1 and the second resonant capacitor C2 at the same time. Since the first resonant capacitor C1 and the second resonant capacitor C2 are connected in parallel, the total resonant capacitor is The sum of the capacitance of the first resonant capacitor C1 and the capacitance of the second resonant capacitor C2 can make the resonance state optimal by selecting the appropriate inductance value and resonant capacitance value of the first resonant coil L1. In this state, the resonant coil The inertial energy is large enough to reduce the voltage of the collector of the resonant switching tube 30 to 0 volts, and the resonant switching tube 30 is in a soft-on state when it is turned on again, and the loss of the switching tube is small. At this time, the electromagnetic heating device can realize continuous high-power heating.

When the controller 50 controls the first controllable switch K1 to be turned off and the second controllable switch K2 to be closed, the first resonant coil L1, the second resonant coil L2, the first resonant capacitor C1, and the second resonant capacitor C2 participate in resonance together. In the resonance process, when the controller 50 controls the resonant switch tube 30 to close, the first resonant coil L1 and the second resonant coil L2 are charged; when the controller 50 controls the resonant switch tube 30 to be disconnected, the first resonant coil connected in series L1 and the second resonant coil L2 oscillate with the parallel connection of the first resonant capacitor C1 and the second resonant capacitor C2, and the series connection of the first resonant coil L1 and the second resonant coil L2 to the parallel connection of the first resonant capacitor C1 and the second resonant capacitor C2 at the same time Charging, because the first resonant coil L1 and the second resonant coil L2 are in series, the total resonant inductance increases, according to the inductance energy formula W=L*I*I/2 (wherein, I is the circuit flowing through the inductance, L is the inductance of the inductor, and W is the energy stored in the inductor. It can be seen that when the inductance increases, the inertial energy of the resonant coil increases, so that the voltage drop range of the resonant capacitor becomes larger, and the resonance can also be made when the heating power becomes smaller. The voltage of the collector of the switch tube 30 drops to 0 volts. At this time, the electromagnetic heating device can realize continuous medium power heating.

When the controller 50 controls the first controllable switch K1 to close and the second controllable switch K2 to open, the second resonant coil L2 is short-circuited and does not participate in resonance, and the second resonant capacitor C2 is turned off, only the first The resonant coil L1 and the first resonant capacitor C1 participate in the resonance. During the resonance process, when the controller 50 controls the resonant switch tube 30 to be closed, the first resonant coil L1 is charged; when the controller 50 controls the resonant switch tube 30 to be turned off, the first resonant coil L1 and the first resonant capacitor C1 are Oscillation, the first resonant coil L1 charges the first resonant capacitor C1, since only the first resonant capacitor C1 participates in the resonance, the total resonant capacitance decreases, and when the inertial energy of the resonant coil remains unchanged, the formula U=Q /C (where U is the voltage of the capacitor, C is the capacitance of the capacitor, and Q is the amount of charge stored in the capacitor), it can be seen that when the capacitance decreases, the range of voltage change (drop) of the resonant capacitor becomes larger, and when the heating power changes The voltage of the collector of the resonant switching tube 30 can also drop to 0 volts. At this time, the electromagnetic heating device can realize continuous medium power heating.

When the controller 50 controls the first controllable switch K1 and the second controllable switch K2 to be turned off, the second resonant capacitor C2 is turned off, and the first resonant coil L1, the second resonant coil L2 and the first resonant capacitor C1 participate in the resonance . During the resonance process, when the controller 50 controls the resonant switch tube 30 to close, the first resonant coil L1 and the second resonant coil L2 are charged; when the controller 50 controls the resonant switch tube 30 to be turned off, the first resonant inductor in series L1 and the second resonant inductance L2 charge the first resonant capacitor C1. At this time, the first resonant inductance L1 and the second resonant inductance L2 are connected in series, the total resonant inductance increases, and the total resonant capacitance decreases, and the inductance increases Simultaneously reducing the capacitance and capacitance can make the voltage of the collector of the resonant switching tube 30 drop to 0 volts under lower heating power. The electromagnetic heating device can realize continuous low power heating.

Further, according to an embodiment of the present invention, when the user's instruction is a high-power heating instruction, the controller 50 controls both the first controllable switch K1 and the second controllable switch K2 to be in the closed state; when the user's instruction is When the medium power heating instruction is given, the controller 50 controls the first controllable switch K1 to be in the closed state and the second controllable switch K2 to be in the open state, or the controller 50 controls the first controllable switch K1 to be in the open state and the second controllable switch K1 to be in the open state. The control switch K2 is in a closed state; when the user's instruction is a low-power heating instruction, the controller 50 controls both the first controllable switch K1 and the second controllable switch K2 to be in an open state.

That is to say, during the working process of the electric heating device, the user can select the heating power according to the cooking needs, such as selecting low power when cooking soup or frying eggs, and selecting high power when stir-frying or boiling water.

The controller 50 judges after receiving the power gear command sent by the interactive interface 10. If it is a high-power heating command, the controller 50 outputs two switch control signals to the first controllable switch K1 and the second controllable switch K2 respectively. , to control K1 and K2 to close, at this time, the voltage of the collector of the resonant switch tube 30 can be reduced to 0 volts by design, and the resonant switch tube 30 is in a soft open state when it is turned on again, and the loss of the switch tube is small, and the electromagnetic heating device Can output high power continuously.

Afterwards, when the heating power decreases, the conduction time of the resonant switch tube 30 is shortened, the energy absorbed by the first resonant coil L1 is reduced, the current of the first resonant coil L1 is reduced, and the inertial energy is also reduced, so that the resonant switch tube 30 The collector voltage cannot drop to 0 volts. If the resonant inductance and/or resonant capacitance remain unchanged, the resonant switching tube 30 will be hard turned on when it is turned on again, and the loss of the switching tube will be large. Based on this, when the heating power is reduced, the following methods can be adopted to reduce the loss of the switching tube:

If it is a medium-power heating instruction, the controller 50 can keep the first controllable switch K1 on and keep the second controllable switch K2 off. After K2 is disconnected, the total resonant capacitance decreases, and the range of voltage change (drop) of the capacitance becomes larger. When the voltage of the capacitance drops to 0 volts, the resonant switch tube 30 is turned on again, which is in a software state, and the loss of the switch tube is reduced. Small, electromagnetic heating device can output medium power continuously. Alternatively, the controller 50 can keep the second controllable switch K2 on and keep the first controllable switch K1 off. After K1 is disconnected, the total resonant inductance increases, the resonant inertial energy of the inductance coil increases, and the voltage variation (drop) range of the capacitor becomes larger. When the voltage of the capacitor drops to 0 volts, the resonant switch tube 30 is turned on again, In the software state, the loss of the switching tube is reduced, and the electromagnetic heating device can continuously output medium power.

If it is a low-power heating command, the controller 50 controls the first controllable switch K1 and the second controllable switch K2 to be disconnected, the resonant capacitance decreases, and at the same time the resonant inductance increases, and the voltage change (drop) range of the capacitance is larger , The electromagnetic heating device can output low power continuously.

In addition, according to an embodiment of the utility model, the power module 20 includes: a bridge rectifier stack 201 , a first capacitor C3 and an LC filter circuit 202 .

Wherein, the rectifier bridge stack 201 is used to rectify the input alternating current, and the rectifier bridge stack 201 has a first input terminal and a second input terminal, a first output terminal and a second output terminal; the first capacitor C3 is connected in parallel to the rectifier bridge stack 201 between the first input terminal and the second input terminal of the rectifier bridge stack 202; the LC filter circuit 202 is connected between the first output terminal and the second output terminal of the rectifier bridge stack 202, and the LC filter circuit 202 is used for filtering the rectified direct current.

Specifically, the LC filter circuit 202 may include a filter inductor L3 and a filter capacitor C4, the first end of the filter inductor L3 is connected to the first output end of the rectifier bridge stack 201, and the second end of the filter inductor L3 is respectively connected to the first resonant inductor The first end is connected to the first end of the filter capacitor C4, and the second end of the filter capacitor C4 is connected to the second output end of the rectifier bridge stack 201 and grounded.

In summary, according to the electromagnetic heating device for cooking utensils proposed by the embodiment of the present invention, the first resonant coil is connected in series with the inductance switching unit for changing the resonant inductance, and then connected to the collector of the resonant switch tube. The capacitive switching unit for changing the resonant capacitance is connected in series with the first resonant capacitor and connected in parallel between the collector and emitter of the resonant switching tube, and the resonant switching tube, the capacitive switching unit and the inductive switching unit are respectively controlled by the controller To change the heating power of the electromagnetic heating device. Therefore, the resonance mode of the electromagnetic heating device can be adjusted by opening or closing the capacitance switching unit and the inductance switching unit, thereby changing the resonance parameters of the resonant circuit, expanding the heating power range of continuous heating, and making the electromagnetic heating device operate at a higher power. Continuous heating can be achieved with lower power and lower power, which can improve the cooking effect and user's cooking experience, and can ensure the reliability of the electromagnetic heating device and avoid damage to the IGBT tube.

Finally, an embodiment of the present utility model also proposes a cooking appliance, which includes the electromagnetic heating device of the above-mentioned embodiment.

According to the cooking utensil proposed by the embodiment of the utility model, the resonant mode of the electromagnetic heating device can be adjusted through the electric heating device, thereby changing the resonance parameter of the resonant circuit, expanding the heating power range of continuous heating, and making the cooking utensil operate at higher power and lower The power can achieve continuous heating, improve the cooking effect, improve the user's cooking experience, and can ensure the reliability of cooking utensils and avoid IGBT tube damage.

Wherein, the cooking appliance may be an induction cooker, an electromagnetic rice cooker, or an electromagnetic pressure cooker.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

Any process or method descriptions in flowcharts or otherwise described herein may be understood to represent modules, segments or portions of code comprising one or more executable instructions for implementing specific logical functions or steps of the process , and the scope of preferred embodiments of the invention includes alternative implementations in which functions may be performed out of the order shown or discussed, including substantially concurrently or in reverse order depending on the functions involved, which shall It is understood by those skilled in the art to which the embodiments of the present invention pertain.

The logic and/or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium, For use with instruction execution systems, devices, or devices (such as computer-based systems, systems including processors, or other systems that can fetch instructions from instruction execution systems, devices, or devices and execute instructions), or in conjunction with these instruction execution systems, devices or equipment for use. For the purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate or transmit a program for use in or in conjunction with an instruction execution system, device or device. More specific examples (non-exhaustive list) of computer-readable media include the following: electrical connection with one or more wires (electronic device), portable computer cartridge (magnetic device), random access memory (RAM) , read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program can be printed, since the program can be read, for example, by optically scanning the paper or other medium, followed by editing, interpretation or other suitable processing if necessary. The program is processed electronically and stored in computer memory.

It should be understood that various parts of the present invention can be realized by hardware, software, firmware or their combination. In the embodiments described above, various steps or methods may be implemented by software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques known in the art: Discrete logic circuits, ASICs with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

Those of ordinary skill in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. During execution, one or a combination of the steps of the method embodiments is included.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, each unit may exist separately physically, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules. If the integrated modules are realized in the form of software function modules and sold or used as independent products, they can also be stored in a computer-readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, and the like. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (9)

1. for an electromagnetic heater for cooking apparatus, it is characterized in that, comprising:

Interactive interface, for receiving the instruction of user;

Power module;

R-T tube;

Resonance modules, described resonance modules comprise the first resonance coil, for change resonant inductance amount inductance switch unit, for changing electric capacity switch unit and first resonant capacitance of resonant capacitance amount, wherein, described first resonance coil is connected with the collector electrode of described R-T tube after being connected in series with described inductance switch unit, described first resonant capacitance is connected in parallel between the collector and emitter of described R-T tube, and described electric capacity switch unit and described first resonant capacitance are connected in parallel; And

Controller, described controller is connected with described inductance switch unit with the control pole of described R-T tube, described electric capacity switch unit respectively, and described controller controls to described R-T tube, described electric capacity switch unit and described inductance switch unit the heating power changing described electromagnetic heater respectively according to the instruction of described user.

2. as claimed in claim 1 for the electromagnetic heater of cooking apparatus, it is characterized in that, described inductance switch unit comprises the second resonance coil and the first gate-controlled switch that are connected in parallel, and wherein, the control end of described first gate-controlled switch is connected with described controller.

3. as claimed in claim 2 for the electromagnetic heater of cooking apparatus, it is characterized in that, described electric capacity switch unit comprises the second resonant capacitance and the second gate-controlled switch that are connected in series, and wherein, the control end of described second gate-controlled switch is connected with described controller.

4., as claimed in claim 3 for the electromagnetic heater of cooking apparatus, it is characterized in that, described first gate-controlled switch and described second gate-controlled switch are relay, IGBT, metal-oxide-semiconductor or controllable silicon.

5., as claimed in claim 3 for the electromagnetic heater of cooking apparatus, it is characterized in that, wherein,

When the instruction of described user is high power heating instructions, described controller controls described first gate-controlled switch and described second gate-controlled switch is all in closure state;

When the instruction of described user is middle power heating instruction, described first gate-controlled switch of described controller control is in closure state and described second gate-controlled switch is in off-state, or described first gate-controlled switch of described controller control is in off-state and described second gate-controlled switch is in closure state;

When the instruction of described user is low-power heating instructions, described controller controls described first gate-controlled switch and described second gate-controlled switch is all in off-state.

6., as claimed in claim 5 for the electromagnetic heater of cooking apparatus, it is characterized in that, wherein,

When described first gate-controlled switch and described second gate-controlled switch are all in closure state, connect to carry out resonant operational with described first resonance coil after described first resonant capacitance and described second resonant capacitance parallel connection;

When described first gate-controlled switch is in closure state and described second gate-controlled switch is in off-state, described first resonance coil connects to carry out resonant operational with described first resonant capacitance;

When described first gate-controlled switch is in off-state and described second gate-controlled switch is all in closure state, connect to carry out resonant operational with described first resonance coil, described second resonance coil after described first resonant capacitance and described second resonant capacitance parallel connection;

When described first gate-controlled switch and described second gate-controlled switch are all in off-state, connect to carry out resonant operational with described first resonant capacitance again after described first resonance coil and described second resonance coil series connection.

7. the electromagnetic heater for cooking apparatus according to any one of claim 1-6, is characterized in that, described R-T tube is IGBT.

8., as claimed in claim 1 for the electromagnetic heater of cooking apparatus, it is characterized in that, described power module comprises:

Rectifier bridge stack, described rectifier bridge stack has first input end and the second input, the first output and the second output;

First electric capacity, described first Capacitance parallel connection is between the first input end and the second input of described rectifier bridge stack;

LC filter circuit, described LC filter circuit is connected between the first output of described rectifier bridge stack and the second output.

9. a cooking apparatus, is characterized in that, comprises the electromagnetic heater for cooking apparatus according to any one of claim 1-8.