Electromagnetic oven and driving circuit thereof

Abstract

The invention discloses an induction cooker driving circuit which comprises a mains supply input port, a control module, a rectifier module, a switching tube driving 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] The present invention relates to the technical field of electromagnetic ovens, and more particularly to an electromagnetic oven and a driving circuit thereof. Background Art

[0002] Induction cooker is one of the common household appliances, which mainly converts electrical energy into electromagnetic energy and utilizes eddy current effect to heat metal components. Existing induction cookers are classified into half-bridge type and full-bridge type according to their circuit topology.

[0003] The switch tube is an important power device in the induction cooker driving circuit. In order to increase the output power, the traditional induction cooker will configure multiple switch tubes in the circuit and connect each switch tube in parallel. This method has a simple circuit structure and is easy to implement, but it cannot give full play to the performance characteristics of each switch tube, resulting in the state of each switch tube being out of sync, which seriously affects the heating efficiency of the induction cooker. Summary of the invention

[0004] In order to solve the above technical problems, the object of the present invention is to provide an induction cooker and a driving circuit thereof.

[0005] The technical solution adopted by the present invention to solve the problem is:

[0006] A driving circuit for an induction cooker, comprising a mains input port, a control module, a rectifier module, a switch tube driving module, an oscillator module, an output port and a synchronization module, wherein the oscillator modules and the output ports are of the same number and are each provided with two or more, the circuit structure of each oscillator module is consistent, and the resonant frequency of each oscillator module is consistent;

[0007] The mains input port is connected to the rectifier module, the rectifier module is respectively connected to each of the oscillation modules, the oscillation modules are connected to the output ports in a one-to-one correspondence, 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 switch tube driving modules, the number of the switch tube driving modules is the same as that of the oscillation modules, the control module is connected to each of the switch tube driving modules respectively, and the switch tube driving modules are connected to the oscillation modules in a one-to-one correspondence;

[0009] If there is 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 of the oscillation modules respectively.

[0010] As a further improvement of the above technical solution, the control module includes a single-chip microcomputer chip, an NPN transistor Q1, a resistor R1, a resistor R2 and a resistor R3. The single-chip microcomputer chip 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 end 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 end, and the collector of the transistor Q1 is respectively connected to each of the switch tube driving modules.

[0011] As a further improvement of the above technical solution, the switch tube 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 switch tube M1, and the switch tube M1 is an insulated gate bipolar transistor;

[0012] The control module is connected to the base of the transistor Q2 and the base of the transistor Q3 respectively, 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 end, 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 between the resistor R4 and the resistor R5, the other end of the resistor R6 is respectively 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 between the resistor R4 and the resistor R5, and the collector of the switch tube M1 is connected to the oscillation module.

[0013] As a further improvement of 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, the other end of the inductor L1 is connected to the ground through the capacitor C1, one end of the capacitor C2 is connected to the connection point between the inductor L1 and the capacitor C1, the other end of the capacitor C2 is connected to the switch tube driving module, and the two ends of the capacitor C2 are respectively connected to the output port.

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

[0015] As a further improvement of the above technical solution, the present 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 of the above technical solution, the present technical solution also includes a switch tube temperature detection module and a furnace surface temperature detection module, and the switch tube temperature detection module and the furnace surface temperature detection module are respectively connected to the control module.

[0017] As a further improvement of the above technical solution, the present technical solution also includes a fan drive module and a human-computer interaction module, and the fan drive module and the human-computer interaction module are respectively connected to the control module.

[0018] The present invention also discloses an induction cooker, comprising the above-mentioned drive circuit and multiple coil disks, each of which has the same inductance, and the number of the coil disks is consistent with the number of the output ports, and both are provided with two or more, and the output ports are connected to the coil disks in a one-to-one correspondence.

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

[0020] The beneficial effects of the present invention are as follows: in the technical solution, multiple groups of corresponding switch tube driving 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 of the coil disk connected to the output port and the resonant capacitor in the oscillation circuit through the synchronization module and controls each switch tube driving module according to the synchronization signal. In the present solution, each switch tube does not need to be arranged in parallel, and the performance characteristics of each switch tube can be fully utilized to ensure the synchronization of the states of each switch tube, thereby effectively improving the heating efficiency of the induction cooker. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further explained below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Figure 1 This is a first circuit module framework diagram of the present invention;

[0023] Figure 2 It is a second circuit module framework diagram of the present invention;

[0024] Figure 3 It is a circuit schematic diagram of the control module in the present invention;

[0025] Figure 4 is a circuit schematic diagram of the switch tube driving module in the present invention;

[0026] Figure 5 It is a circuit principle diagram of the oscillation module and the synchronization module in the present invention. DETAILED DESCRIPTION

[0027] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] Reference Figures 1 to 5The present application discloses a driving circuit of an induction cooker, wherein a first embodiment thereof comprises a mains input port, a control module, a rectifier module, a switch tube driving module, an oscillator module, an output port and a synchronization module, wherein the number of the oscillator modules and the output port is the same and two or more are provided, the circuit structure of each oscillator module is the same, and the resonant frequency of each oscillator module is the same;

[0032] The mains input port is connected to the rectifier module, the rectifier module is respectively connected to each of the oscillation modules, the oscillation modules are connected to the output ports in a one-to-one correspondence, 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 switch tube driving modules, the number of the switch tube driving modules is the same as that of the oscillation modules, the control module is connected to each of the switch tube driving modules respectively, and the switch tube driving modules are connected to the oscillation modules in a one-to-one correspondence;

[0034] If there is 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 of the oscillation modules respectively.

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

[0036] In this embodiment, the circuit structures of the oscillation modules are consistent. The oscillation modules are composed of a plurality of inductance elements and a plurality of capacitance elements. The parameters of the inductance elements corresponding to the oscillation modules are consistent. The parameters of the capacitance elements corresponding to the oscillation modules are consistent. The resonant frequencies of the oscillation modules are consistent.

[0037] Specifically, in this embodiment, multiple groups of corresponding switch tube driving 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 disk connected to the output port and the resonant capacitor in the oscillation circuit through the synchronization module and controls each of the switch tube driving modules according to the synchronization signal. In this embodiment, the various switch tubes do not need to be arranged in parallel, and the performance characteristics of each of the multiple switch tubes can be fully utilized to ensure that the states of each switch tube are synchronized, thereby effectively improving the heating efficiency of the induction cooker.

[0038] Further as a preferred implementation, in this embodiment, the control module includes a single-chip microcomputer chip, an NPN transistor Q1, a resistor R1, a resistor R2 and a resistor R3, the single-chip microcomputer chip is connected to the base of the transistor Q1 through the resistor R1, the emitter of the transistor Q1 is connected to the ground terminal, the collector of the transistor Q1 is connected to the power supply terminal 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 terminal, and the collector of the transistor Q1 is respectively connected to each of the switch tube driving modules.

[0039] As a further preferred implementation, in this embodiment, the switch tube 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 switch tube M1, and the switch tube M1 is an insulated gate bipolar transistor;

[0040] The collector of the transistor Q1 in the control module is connected to the base of the transistor Q2 and the base of the transistor Q3 respectively, the collector of the transistor Q2 is connected to the ground terminal, 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 terminal, 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 between the resistor R4 and the resistor R5, the other end of the resistor R6 is connected to the ground terminal and the emitter of the switch tube M1 respectively, the gate of the switch tube M1 is connected to the connection point between the resistor R4 and the resistor R5, and the collector of the switch tube M1 is connected to the oscillation module.

[0041] Further as a preferred implementation, 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, the other end of the inductor L1 is connected to the ground through the capacitor C1, one end of the capacitor C2 is connected to the connection point between the inductor L1 and the capacitor C1, the other end of the capacitor C2 is connected to the collector of the switch tube M1 in the switch tube driving module, and the two ends of the capacitor C2 are respectively connected to the output port.

[0042] Further as a preferred implementation, in this embodiment, the synchronization module includes 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 to the oscillation module, and the other end of the resistor R9 is connected to the ground through the resistor R8 and the resistor R7 in succession, the capacitor C3 is connected in parallel with the resistor R7, one end of the resistor R12 is connected to the oscillation module, and the other end of the resistor R12 is connected to the ground through the resistor R11 and the resistor R10 in succession, one end of the capacitor C4 is connected to the connection point between the resistor R7 and the resistor R8, and the other end of the capacitor C4 is connected to the connection point between the resistor R10 and the resistor R11, one end of the control module is connected to the connection point between the resistor R7 and the resistor R8, and the other end of the control module is connected to the connection point between the resistor R10 and the resistor R11.

[0043] As a further preferred implementation, in this embodiment, a voltage detection module, a current detection module and a surge detection module are further included, 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 implementation, in this embodiment, a switch tube temperature detection module and a furnace surface temperature detection module are also included, and the switch tube temperature detection module and the furnace surface temperature detection module are respectively connected to the control module.

[0045] As a further preferred implementation, in this embodiment, a fan driving module and a human-computer interaction module are also included, and the fan driving module and the human-computer interaction module are respectively connected to the control module.

[0046] The present application also discloses an induction cooker, a first embodiment of which includes a first embodiment of the drive circuit and multiple coil disks, each of which has the same inductance, and the number of the coil disks is consistent with the number of the output ports, and both are provided with two or more, and the output ports are connected to the coil disks in a one-to-one correspondence.

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

[0048] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A driving circuit for an induction cooker, characterized in that: It includes a mains input port, a control module, a rectifier module, a switch tube drive module, an oscillation module, an output port and a synchronization module. The number of the oscillation modules and the output ports is the same and two or more are provided. The circuit structure of each oscillation module is the same, and the resonant frequency of each oscillation module is the same. The mains input port is connected to the rectifier module, the rectifier module is respectively connected to each of the oscillation modules, the oscillation modules are connected to the output ports in a one-to-one correspondence, the control module is connected to the synchronization module, and the synchronization module is connected to one of the oscillation modules; If there are multiple switch tube driving modules, the number of the switch tube driving modules is the same as that of the oscillation modules, the control module is connected to each of the switch tube driving modules respectively, and the switch tube driving modules are connected to the oscillation modules in a one-to-one correspondence; If there is 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 of the oscillation modules respectively.

2. The driving circuit of an induction cooker according to claim 1, characterized in that: The control module includes a single-chip microcomputer chip, a transistor Q1, a resistor R1, a resistor R2 and a resistor R3. The single-chip microcomputer chip 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 end 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 end, and the collector of the transistor Q1 is respectively connected to each of the switch tube driving modules.

3. The driving circuit of an induction cooker according to claim 1, characterized in that: The switch tube driving module includes a transistor Q2, a transistor Q3, a resistor R4, a resistor R5, a resistor 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 respectively, 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 end, 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 between the resistor R4 and the resistor R5, the other end of the resistor R6 is respectively 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 between 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 induction cooker according to claim 1, characterized in that: 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, the other end of the inductor L1 is connected to the ground through the capacitor C1, one end of the capacitor C2 is connected to the connection point between the inductor L1 and the capacitor C1, the other end of the capacitor C2 is connected to the switch tube driving module, and both ends of the capacitor C2 are respectively connected to the output port.

5. The driving circuit of an induction cooker according to claim 1, characterized in that: The synchronization module includes 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 to the oscillation module, the other end of the resistor R9 is connected to the ground through the resistor R8 and the resistor R7, the capacitor C3 is connected in parallel with the resistor R7, one end of the resistor R12 is connected to the oscillation module, the other end of the resistor R12 is connected to the ground through the resistor R11 and the resistor R10, one end of the capacitor C4 is connected to the connection point between the resistor R7 and the resistor R8, the other end of the capacitor C4 is connected to the connection point between the resistor R10 and the resistor R11, one end of the control module is connected to the connection point between the resistor R7 and the resistor R8, and the other end of the control module is connected to the connection point between the resistor R10 and the resistor R11.

6. The driving circuit of an induction cooker according to claim 1, characterized in that: It 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.

7. The driving circuit of an induction cooker according to claim 1, characterized in that: It also includes a switch tube temperature detection module and a furnace surface temperature detection module, and the switch tube temperature detection module and the furnace surface temperature detection module are respectively connected to the control module.

8. The driving circuit of an induction cooker according to claim 1, characterized in that: It also includes a fan drive module and a human-computer interaction module, and the fan drive module and the human-computer interaction module are respectively connected to the control module.

9. An induction cooker, characterized in that: It comprises the driving circuit as claimed in any one of claims 1 to 8 and a plurality of coil disks, wherein the inductance of each coil disk is the same, the number of the coil disks is consistent with the number of the output ports and two or more are provided, and the output ports are connected to the coil disks in a one-to-one correspondence.

10. An induction cooker according to claim 9, characterized in that: The coil disks are distributed in a concentric circle structure.

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