Electromagnetic oven and driving circuit thereof

Abstract

The utility model discloses a drive circuit of an induction cooker. The drive circuit comprises a commercial power input port, a control module, a rectification module, a switch tube drive module, an oscillation module, an output port and a synchronization module. According to the technical scheme, a plurality of groups of corresponding switch tube driving modules and oscillation modules are configured, and the synchronization module is connected with one oscillation module. The control module detects the synchronizing signals of the coil panel connected with the output port and the resonant capacitor in the oscillating circuit through the synchronizing module and controls the switching tube driving modules according to the synchronizing signals, the switching tubes in the scheme do not need to be arranged in parallel, and the performance characteristics of the switching tubes can be brought into full play; state synchronization of each switch tube is guaranteed, and heating efficiency of the induction cooker is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of induction cooker technology, and more specifically to an induction cooker and its driving circuit. Background Technology

[0002] An induction cooker is a common household appliance that primarily converts electrical energy into electromagnetic energy and uses the eddy current effect to heat metal components. Existing induction cookers are classified into half-bridge and full-bridge types based on their circuit topology.

[0003] In the drive circuit of an induction cooker, the switching transistor is a crucial power device. Traditional induction cookers use multiple switching transistors connected in parallel to increase output power. While this method is simple and easy to implement, it fails to fully utilize the individual performance characteristics of each transistor, leading to asynchronous states and severely impacting the heating efficiency of the induction cooker. Utility Model Content

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is to provide an induction cooker and its driving circuit.

[0005] The technical solution adopted by this utility model to solve the problem is:

[0006] A driving circuit for an induction cooker includes an AC input port, a control module, a rectifier module, a switching transistor driving module, an oscillation module, an output port, and a synchronization module. The number of oscillation modules and the number of output ports are the same, and each has two or more. The circuit structure of each oscillation module is the same, and the resonant frequency of each oscillation module is the same.

[0007] The mains input port is connected to the rectifier module, the rectifier module is connected to each of the oscillation modules, the oscillation modules are connected to the output ports one by one, the control module is connected to the synchronization module, and the synchronization module is connected to one of the oscillation modules.

[0008] If there are multiple switching transistor driving modules, the number of switching transistor driving modules is the same as the number of oscillation modules, the control module is connected to each of the switching transistor driving modules respectively, and the switching transistor driving modules are connected to the oscillation modules in a one-to-one correspondence.

[0009] If one of the switching transistor driving modules is provided, the control module is connected to the switching transistor driving module, and the switching transistor driving module is connected to each of the oscillation modules respectively.

[0010] As a further improvement to the above technical solution, the control module includes a microcontroller chip, an NPN transistor Q1, resistors R1, R2, and R3. The microcontroller chip is connected to the base of the transistor Q1 through resistor R1. The emitter of the transistor Q1 is connected to ground. The collector of the transistor Q1 is connected to the power supply through resistor R3. One end of resistor R2 is connected to the base of the transistor Q1, and the other end of resistor R2 is connected to the power supply. The collector of the transistor Q1 is connected to each of the switching transistor drive modules.

[0011] As a further improvement to the above technical solution, the switching transistor driving module includes a PNP transistor Q2, an NPN transistor Q3, resistors R4, R5, and R6, a diode D1, and a switching transistor M1, wherein the switching transistor M1 is an insulated gate bipolar transistor.

[0012] The control module is connected to the base of transistor Q2 and the base of transistor Q3. The collector of transistor Q2 is connected to ground, the emitter of transistor Q2 is connected to the emitter of transistor Q3, the collector of transistor Q3 is connected to the power supply, the anode of diode D1 is connected to the emitter of transistor Q3, the cathode of diode D1 is connected to the collector of transistor Q3, one end of resistor R4 is connected to the anode of diode D1, the other end of resistor R4 is connected to the collector of transistor Q2 through resistor R5, one end of resistor R6 is connected to the junction of resistors R4 and R5, the other end of resistor R6 is connected to ground and the emitter of switching transistor M1, the gate of switching transistor M1 is connected to the junction of resistors R4 and R5, and the collector of switching transistor M1 is connected to the oscillation module.

[0013] As a further improvement to the above technical solution, the oscillation module includes an inductor L1, a capacitor C1, and a capacitor C2. The rectifier module is connected to one end of the inductor L1, and the other end of the inductor L1 is connected to ground through the capacitor C1. One end of the capacitor C2 is connected to the connection point of the inductor L1 and the capacitor C1, and the other end of the capacitor C2 is connected to the switching transistor drive module. The two ends of the capacitor C2 are respectively connected to the output port.

[0014] As a further improvement to the above technical solution, the synchronization module includes capacitor C3, capacitor C4, resistors R7, R8, R9, R10, R11, and R12. One end of resistor R9 is connected to the oscillation module, and the other end of resistor R9 is connected to ground through resistors R8 and R7. Capacitor C3 is connected in parallel with resistor R7. One end of resistor R12 is connected to the oscillation module, and the other end of resistor R12 is connected to ground through resistors R11 and R10. One end of capacitor C4 is connected to the connection point of resistors R7 and R8, and the other end of capacitor C4 is connected to the connection point of resistors R10 and R11. One end of the control module is connected to the connection point of resistors R7 and R8, and the other end of the control module is connected to the connection point of resistors R10 and R11.

[0015] As a further improvement to the above technical solution, this technical solution also includes a voltage detection module, a current detection module, and a surge detection module, and the control module is connected to the voltage detection module, the current detection module, and the surge detection module respectively.

[0016] As a further improvement to the above technical solution, this technical solution also includes a switching tube temperature detection module and a furnace surface temperature detection module, which are respectively connected to the control module.

[0017] As a further improvement to the above technical solution, this technical solution also includes a wind turbine drive module and a human-machine interaction module, wherein the wind turbine drive module and the human-machine interaction module are respectively connected to the control module.

[0018] This utility model also discloses an induction cooker, including the above-described driving circuit and multiple coils, each coil having the same inductance, and the number of coils and output ports being the same, with two or more of each coil. The output ports are connected to the coils in a one-to-one correspondence.

[0019] As a further improvement to the above technical solution, each of the coil disks is distributed in a concentric circle structure.

[0020] The beneficial effects of this utility model are as follows: This technical solution is equipped with multiple corresponding switching transistor drive modules and oscillation modules, and the synchronization module is connected to one of the oscillation modules. The control module detects the synchronization signal between the coil disk connected to the output port and the resonant capacitor in the oscillation circuit through the synchronization module and controls each switching transistor drive module according to the synchronization signal. In this solution, each switching transistor does not need to be set in parallel, which can give full play to the performance characteristics of each switching transistor, ensure the synchronization of the state of each switching transistor, and effectively improve the heating efficiency of the induction cooker. Attached Figure Description

[0021] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 This is the first circuit module framework diagram of this utility model;

[0023] Figure 2 This is a second circuit module framework diagram of this utility model;

[0024] Figure 3 This is the circuit schematic diagram of the control module in this utility model;

[0025] Figure 4 This is the circuit schematic diagram of the switching transistor driving module in this utility model;

[0026] Figure 5 This is a circuit diagram of the oscillation module and the synchronization module in this utility model. Detailed Implementation

[0027] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0028] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0030] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0031] Reference Figures 1 to 5 This application discloses a driving circuit for an induction cooker. In its first embodiment, it includes an AC power input port, a control module, a rectifier module, a switching transistor driving module, an oscillation module, an output port, and a synchronization module. The number of oscillation modules and the number of output ports are the same, and each is provided with two or more. The circuit structure of each oscillation module is the same, and the resonant frequency of each oscillation module is the same.

[0032] The mains input port is connected to the rectifier module, the rectifier module is connected to each of the oscillation modules, the oscillation modules are connected to the output ports one by one, the control module is connected to the synchronization module, and the synchronization module is connected to one of the oscillation modules.

[0033] If there are multiple switching transistor driving modules, the number of switching transistor driving modules is the same as the number of oscillation modules, the control module is connected to each of the switching transistor driving modules respectively, and the switching transistor driving modules are connected to the oscillation modules in a one-to-one correspondence.

[0034] If one of the switching transistor driving modules is provided, the control module is connected to the switching transistor driving module, and the switching transistor driving module is connected to each of the oscillation modules respectively.

[0035] In this embodiment, the output port is used to connect to an external coil disk. The coil disks connected in this embodiment are distributed in a concentric circle structure and the inductance of each coil disk is the same.

[0036] In this embodiment, the circuit structure of each oscillation module is the same. Each oscillation module consists of several inductors and several capacitors. The parameters of the inductors and capacitors corresponding to each oscillation module are the same, and the resonant frequency of each oscillation module is the same.

[0037] Specifically, in this embodiment, multiple sets of corresponding switching transistor drive modules and oscillation modules are configured, and the synchronization module is connected to one of the oscillation modules. The control module detects the synchronization signal between the coil connected to the output port and the resonant capacitor in the oscillation circuit through the synchronization module and controls each of the switching transistor drive modules according to the synchronization signal. In this embodiment, the switching transistors do not need to be set in parallel, which can give full play to the performance characteristics of multiple switching transistors, ensure the synchronization of the states of each switching transistor, and effectively improve the heating efficiency of the induction cooker.

[0038] As a further preferred embodiment, in this embodiment, the control module includes a microcontroller chip, an NPN transistor Q1, resistors R1, R2, and R3. The microcontroller chip is connected to the base of the transistor Q1 through resistor R1, the emitter of the transistor Q1 is connected to ground, the collector of the transistor Q1 is connected to the power supply through resistor R3, one end of resistor R2 is connected to the base of the transistor Q1, and the other end of resistor R2 is connected to the power supply. The collector of the transistor Q1 is connected to each of the switching transistor drive modules.

[0039] As a further preferred embodiment, in this embodiment, the switching transistor driving module includes a PNP transistor Q2, an NPN transistor Q3, a resistor R4, a resistor R5, a resistor R6, a diode D1, and a switching transistor M1, wherein the switching transistor M1 is an insulated gate bipolar transistor.

[0040] In the control module, the collector of transistor Q1 is connected to the base of transistor Q2 and the base of transistor Q3, respectively. The collector of transistor Q2 is connected to ground. The emitter of transistor Q2 is connected to the emitter of transistor Q3. The collector of transistor Q3 is connected to the power supply. The anode of diode D1 is connected to the emitter of transistor Q3, and the cathode of diode D1 is connected to the collector of transistor Q3. One end of resistor R4 is connected to the anode of diode D1, and the other end of resistor R4 is connected to the collector of transistor Q2 through resistor R5. One end of resistor R6 is connected to the junction of resistors R4 and R5, and the other end of resistor R6 is connected to ground and the emitter of switching transistor M1. The gate of switching transistor M1 is connected to the junction of resistors R4 and R5, and the collector of switching transistor M1 is connected to the oscillation module.

[0041] As a further preferred embodiment, in this embodiment, the oscillation module includes an inductor L1, a capacitor C1, and a capacitor C2. The rectifier module is connected to one end of the inductor L1, and the other end of the inductor L1 is connected to ground through the capacitor C1. One end of the capacitor C2 is connected to the connection point of the inductor L1 and the capacitor C1, and the other end of the capacitor C2 is connected to the collector of the switching transistor M1 in the switching transistor drive module. The two ends of the capacitor C2 are respectively connected to the output port.

[0042] As a further preferred embodiment, in this embodiment, the synchronization module includes capacitor C3, capacitor C4, resistors R7, R8, R9, R10, R11, and R12. One end of resistor R9 is connected to the oscillation module, and the other end of resistor R9 is connected to ground successively through resistors R8 and R7. Capacitor C3 is connected in parallel with resistor R7. One end of resistor R12 is connected to the oscillation module, and the other end of resistor R12 is connected to ground successively through resistors R11 and R10. One end of capacitor C4 is connected to the connection point of resistors R7 and R8, and the other end of capacitor C4 is connected to the connection point of resistors R10 and R11. One end of the control module is connected to the connection point of resistors R7 and R8, and the other end of the control module is connected to the connection point of resistors R10 and R11.

[0043] As a further preferred embodiment, this embodiment also includes a voltage detection module, a current detection module, and a surge detection module, and the control module is connected to the voltage detection module, the current detection module, and the surge detection module, respectively.

[0044] As a further preferred embodiment, this embodiment also includes a switching transistor temperature detection module and a furnace surface temperature detection module, which are respectively connected to the control module.

[0045] As a further preferred embodiment, this embodiment also includes a fan drive module and a human-machine interaction module, which are respectively connected to the control module.

[0046] This application also discloses an induction cooker, the first embodiment of which includes the first embodiment of the driving circuit and a plurality of coils, each of the coils having the same inductance, the number of the coils being the same as the number of the output ports and each having two or more, and the output ports being connected to the coils in a one-to-one correspondence.

[0047] As a further preferred embodiment, in this embodiment, each of the coil disks is distributed in a concentric circle structure.

[0048] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the concept of this utility model and the contents of the specification and drawings of this utility model, or direct or indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A driving circuit of an electromagnetic oven, characterized by comprising: The utility model provides an improved resonant inverter, which comprises a mains input port, a control module, a rectifier module, a switch tube driving module, an oscillation module, an output port and a synchronization module. The mains input port is connected to the rectifier module, the rectifier module is connected to each oscillation module, the oscillation module is connected to the output port one by one, the control module is connected to the synchronization module, and the synchronization module is connected to one of the oscillation modules. If the switch tube driving module is provided with multiple switch tube driving modules, the number of the switch tube driving modules is consistent with the number of the oscillation modules, the control module is connected to each switch tube driving module, and the switch tube driving module is connected to the oscillation module one by one. If the switch tube driving module is provided with one switch tube driving module, the control module is connected to the switch tube driving module, and the switch tube driving module is connected to each oscillation module.

2. The driving circuit of an electromagnetic cooker according to claim 1, wherein: The control module comprises a single-chip microcomputer, a transistor Q1, resistors R1, R2 and R3, the single-chip microcomputer is connected to the base of the transistor Q1 through the resistor R1, the emitter of the transistor Q1 is connected to the ground, the collector of the transistor Q1 is connected to the power supply through the resistor R3, one end of the resistor R2 is connected to the base of the transistor Q1, the other end of the resistor R2 is connected to the power supply, and the collector of the transistor Q1 is connected to each switch tube driving module.

3. The driving circuit of an electromagnetic cooker according to claim 1, wherein: The switch tube driving module comprises transistors Q2 and Q3, resistors R4, R5 and R6, a diode D1 and a switch tube M1. The control module is connected to the base of the transistor Q2 and the base of the transistor Q3, the collector of the transistor Q2 is connected to the ground, the emitter of the transistor Q2 is connected to the emitter of the transistor Q3, the collector of the transistor Q3 is connected to the power supply, the anode of the diode D1 is connected to the emitter of the transistor Q3, the cathode of the diode D1 is connected to the collector of the transistor Q3, one end of the resistor R4 is connected to the anode of the diode D1, the other end of the resistor R4 is connected to the collector of the transistor Q2 through the resistor R5, one end of the resistor R6 is connected to the connection point of the resistor R4 and the resistor R5, the other end of the resistor R6 is connected to the ground and the emitter of the switch tube M1, the gate of the switch tube M1 is connected to the connection point of the resistor R4 and the resistor R5, and the collector of the switch tube M1 is connected to the oscillation module.

4. The driving circuit of an electromagnetic cooker according to claim 1, wherein: The oscillation module comprises an inductor L1, a capacitor C1 and a capacitor C2, one end of the inductor L1 is connected with the rectifier module, the other end of the inductor L1 is connected with the ground through the capacitor C1, one end of the capacitor C2 is connected at the connection point of the inductor L1 and the capacitor C1, the other end of the capacitor C2 is connected with the switch tube driving module, and the two ends of the capacitor C2 are respectively connected with the output port.

5. The driving circuit of an electromagnetic cooker according to claim 1, wherein: The synchronous module comprises a capacitor C3, a capacitor C4, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11 and a resistor R12, one end of the resistor R9 is connected with the oscillation module, the other end of the resistor R9 is connected with the ground through the resistor R8 and the resistor R7 in sequence, the capacitor C3 is connected with the resistor R7 in parallel, one end of the resistor R12 is connected with the oscillation module, the other end of the resistor R12 is connected with the ground through the resistor R11 and the resistor R10 in sequence, one end of the capacitor C4 is connected at the connection point of the resistor R7 and the resistor R8, the other end of the capacitor C4 is connected at the connection point of the resistor R10 and the resistor R11, one end of the control module is connected at the connection point of the resistor R7 and the resistor R8, and the other end of the control module is connected at the connection point of the resistor R10 and the resistor R11.

6. The driving circuit of an electromagnetic cooker according to claim 1, characterized in that: The voltage detection module, the current detection module and the surge detection module are further included, and the control module is connected with the voltage detection module, the current detection module and the surge detection module respectively.

7. The driving circuit of an electromagnetic cooker according to claim 1, characterized in that: The switch tube temperature detection module and the furnace surface temperature detection module are further included, and the switch tube temperature detection module and the furnace surface temperature detection module are connected with the control module respectively.

8. The driving circuit of an electromagnetic cooker according to claim 1, characterized in that: The fan driving module and the man-machine interaction module are further included, and the fan driving module and the man-machine interaction module are connected with the control module respectively.

9. An electromagnetic cooker characterized by comprising: The driving circuit in any one of claims 1 to 8 and a plurality of coil discs are included, the inductance of each coil disc is the same, the coil discs are consistent in number with the output ports and are each provided with two or more, and the output ports are connected with the coil discs one by one.

10. The electromagnetic stove according to claim 9, characterized in that: Each coil disc is arranged in a concentric circle structure.

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