CN110493905B - Power control circuit and method and induction cooker - Google Patents

Power control circuit and method and induction cooker Download PDF

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Publication number
CN110493905B
CN110493905B CN201910712969.4A CN201910712969A CN110493905B CN 110493905 B CN110493905 B CN 110493905B CN 201910712969 A CN201910712969 A CN 201910712969A CN 110493905 B CN110493905 B CN 110493905B
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circuit
resonant
bridge
switch
capacitor
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CN110493905A (en
Inventor
常明亮
高张
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Shenzhen Megmeet Electrical Co Ltd
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Shenzhen Megmeet Electrical Co Ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control
    • H05B6/687—Circuits for monitoring or control for cooking
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Inverter Devices (AREA)

Abstract

The invention relates to the field of power control, and discloses a power control circuit, a power control method and an induction cooker. The circuit comprises: a first half-bridge resonant circuit; a second half-bridge resonant circuit; the switching circuit is connected between the first half-bridge resonant circuit and the second half-bridge resonant circuit; and the driving circuit is respectively connected with the first half-bridge resonant circuit, the second half-bridge resonant circuit and the switching circuit. When the driving circuit controls the switching circuit to be in a first switching state, the first half-bridge resonant circuit and the switching circuit form a first half-bridge inverter circuit, and the second half-bridge resonant circuit and the switching circuit form a second half-bridge inverter circuit; when the driving circuit controls the switching circuit to be in a second switching state, the first half-bridge resonant circuit and the second half-bridge resonant circuit form a full-bridge inverter circuit. The switching between the half-bridge inverter circuit and the full-bridge inverter circuit is realized by controlling the switching state of the switching circuit through the driving circuit, so that the flexible switching of the output power is realized.

Description

Power control circuit and method and induction cooker
Technical Field
The present invention relates to the field of power control, and in particular, to a power control circuit, a power control method, and an induction cooker.
Background
Electromagnetic ovens are the product of a modern kitchen revolution that allows heat to be generated directly at the bottom of a pan without the need for open flame or conductive heating, thus greatly improving thermal efficiency. The electric appliance is an efficient and energy-saving electric appliance, is completely different from all traditional conduction heating stoves with or without fire, and is widely used in various families due to the convenience in use.
There are multiple induction cookers on the market at present, and the circuit control scheme mainly adopted by the induction cookers is composed of a plurality of single-head cookers with independent circuit control systems in parallel, and the circuit control scheme of each single-head cooker is a single-power transistor circuit control scheme. Namely, a scheme that a plurality of rectifying circuits are respectively connected with a circuit control system of a heating furnace end is adopted.
In the process of implementing the present invention, the inventors found that the related art has the following problems: the output power of the furnace plate is not high.
Disclosure of Invention
An object of an embodiment of the present invention is to provide a power control circuit, a method and an induction cooker, which can realize flexible switching of output power.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a power control circuit applied to an induction cooker, the power control circuit including:
A first half-bridge resonant circuit;
A second half-bridge resonant circuit;
a switching circuit connected between the first half-bridge resonant circuit and the second half-bridge resonant circuit; and
The driving circuit is respectively connected with the first half-bridge resonant circuit, the second half-bridge resonant circuit and the switch circuit;
when the driving circuit controls the switching circuit to work in a first switching state, the first half-bridge resonant circuit and the switching circuit form a first half-bridge inverter circuit, and the second half-bridge resonant circuit and the switching circuit form a second half-bridge inverter circuit;
when the driving circuit controls the switching circuit to work in a second switching state, the first half-bridge resonance circuit and the second half-bridge resonance circuit form a full-bridge inverter circuit.
The driving circuit includes:
the first driving unit is connected with the first half-bridge resonant circuit;
The second driving unit is connected with the second half-bridge resonant circuit; and
The controller is respectively connected with the first driving unit, the second driving unit and the switching circuit and is used for sending a first driving instruction to the first driving unit, so that the first driving unit drives the first half-bridge resonant circuit to work according to the first driving instruction, and sending a second driving instruction to the second driving unit, so that the second driving unit drives the second half-bridge resonant circuit to work according to the second driving instruction, and the controller is also used for controlling the switching state of the switching circuit.
The power control circuit includes:
a first oven tray connected between the first half-bridge resonant circuit and the switching circuit;
the first change-over switch is connected with the first furnace tray in parallel, and is also connected with the controller, and the controller is used for controlling the first change-over switch to work in an on or off state;
On the premise that the switching circuit is in the second switching state:
when the first transfer switch is turned on, the first furnace plate is short-circuited by the first transfer switch;
when the first transfer switch is turned off, an inverter current flows through the first oven tray.
The power control circuit further includes:
The second furnace plate is connected between the second half-bridge resonance circuit and the switch circuit;
The second change-over switch is connected with the second furnace plate in parallel, and is also connected with the controller, and the controller controls the second change-over switch to work in an on or off state;
On the premise that the switching circuit is in the second switching state:
when the second transfer switch is conducted, the second furnace plate is short-circuited by the second transfer switch;
When the second transfer switch is turned off, an inverter current flows through the second tray.
Optionally, the first half-bridge resonant circuit includes a first resonant switch and a second resonant switch, a first capacitor and a second capacitor;
The first resonant switch is connected with the first capacitor in parallel, the second resonant switch is connected with the second capacitor in parallel, and the first resonant switch and the first capacitor which are connected in parallel are connected with the second resonant switch and the second capacitor which are connected in series.
Optionally, the second half-bridge resonant circuit includes a third resonant switch and a fourth resonant switch, a third capacitor and a fourth capacitor;
the third resonant switch is connected with the third capacitor in parallel, the fourth resonant switch is connected with the fourth capacitor in parallel, and the third resonant switch and the third capacitor which are connected in parallel are connected with the fourth resonant switch and the fourth capacitor which are connected in series.
Optionally, the switching circuit includes a third transfer switch, a first resonant capacitor, a second resonant capacitor, a third resonant capacitor, and a fourth resonant capacitor;
When the switch circuit works in a first switch state, the first resonant capacitor and the third resonant capacitor are connected in parallel and jointly participate in the resonance of the first half-bridge resonant circuit, and the second resonant capacitor and the fourth resonant capacitor are connected in parallel and jointly participate in the resonance of the second half-bridge resonant circuit;
When the switching circuit works in a second switching state, the first resonant capacitor and the second resonant capacitor are connected in series, the third resonant capacitor and the fourth resonant capacitor are connected in series, and the first resonant capacitor and the second resonant capacitor which are connected in series, the third resonant capacitor and the fourth resonant capacitor which are connected in series are connected in parallel and then participate in resonance of the full-bridge inverter circuit together.
Optionally, the power control circuit further comprises a first current transformer and a second current transformer;
The first current transformer is connected with the first furnace plate and the first conversion switch in series;
the second current transformer is connected with the second furnace plate and the second change-over switch in series.
In a second aspect, an embodiment of the present invention provides an induction cooker, where the induction cooker includes an induction cooker body and a power control circuit of the induction cooker.
In a third aspect, an embodiment of the present invention provides a power control method, to which the power control circuit is applied, the method including:
acquiring a furnace plate selection instruction;
According to the furnace plate selection instruction, controlling the switching state of the switching circuit;
If the instruction is a first stove selection instruction, the switch circuit works in a first switch state, the first half-bridge resonance circuit and the switch circuit form a first half-bridge inverter circuit, and the second half-bridge resonance circuit and the switch circuit form a second half-bridge inverter circuit;
And if the instruction is a second oven tray selection instruction, the switch circuit works in a second switch state, and the first half-bridge resonance circuit and the second half-bridge resonance circuit form a full-bridge inverter circuit.
In various embodiments of the present invention, the switching circuit is connected between the first half-bridge resonant circuit and the second half-bridge resonant circuit, and the driving circuit is connected to the first half-bridge resonant circuit, the second half-bridge resonant circuit, and the switching circuit, respectively. The driving circuit controls the switching circuit to work in a first switching state, the first half-bridge resonant circuit and the switching circuit form a first half-bridge inverter circuit, and the second half-bridge resonant circuit and the switching circuit form a second half-bridge inverter circuit; the driving circuit controls the switching circuit to work in a second switching state, and the first half-bridge resonant circuit and the second half-bridge resonant circuit form a full-bridge inverter circuit. Therefore, the switching between the half-bridge inverter circuit and the full-bridge inverter circuit is realized by controlling the switching state of the switching circuit by the driving circuit.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
Fig. 1 is a block diagram of a power control circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of a power control circuit according to an embodiment of the present invention;
fig. 3 is a block diagram of a power control circuit according to an embodiment of the present invention;
Fig. 4 is a block diagram of a power control circuit according to an embodiment of the present invention;
fig. 5 is a pulse frequency modulation signal diagram of a half-bridge inverter circuit according to an embodiment of the present invention;
fig. 6 is a pulse frequency modulation signal diagram of a full-bridge inverter circuit according to an embodiment of the present invention;
fig. 7 is a circuit diagram of a power control circuit according to an embodiment of the present invention;
fig. 8 is a block diagram of a power control method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Fig. 1 is a block diagram of a power control circuit according to an embodiment of the present invention, referring to fig. 1, the power control circuit includes a first half-bridge resonant circuit 10, a second half-bridge resonant circuit 20, a switching circuit 30, and a driving circuit 40, wherein the first half-bridge resonant circuit 10 is connected to the second half-bridge resonant circuit 20 through the switching circuit 30, and the driving circuit 40 is connected to the first half-bridge resonant circuit 10, the second half-bridge resonant circuit 20, and the switching circuit 30, respectively. The driving circuit 40 controls the operating state of the switching circuit 30, when the switching circuit 30 operates in the first switching state, the first half-bridge resonant circuit 10 and the switching circuit 30 form a first half-bridge inverter circuit, the second half-bridge resonant circuit 20 and the switching circuit 30 form a second half-bridge inverter circuit, and at this time, the circuits are respectively operated for the two half-bridge inverter circuits; when the switching circuit 30 operates in the second switching state, the first half-bridge resonant circuit 10 and the second half-bridge resonant circuit 20 constitute a full-bridge inverter circuit.
In some embodiments, the first switch state is that the switch circuit 30 is in a switch closed state, and the first half-bridge resonant circuit 10 and the second half-bridge resonant circuit 20 are connected in parallel, so that the first half-bridge resonant circuit 10 and the second half-bridge resonant circuit 20 respectively form a half-bridge inverter circuit with the switch circuit 30 to respectively operate. The second switching state is that the switching circuit 30 is in a switching off state, and the first half-bridge resonant circuit 10 is connected with the second half-bridge resonant circuit 20 through the switching circuit 30, so that the first half-bridge resonant circuit 10 and the second half-bridge resonant circuit 20 are connected in series through the switching circuit 30 to form a full-bridge inverter circuit.
In this embodiment, the driving circuit 40 controls the working state of the switching circuit 30 to adjust the connection relationship between the first half-bridge resonant circuit and the second resonant circuit, so as to switch from the half-bridge inverter circuit to the full-bridge inverter circuit, thereby improving the output power of the circuit.
In some embodiments, referring to fig. 2, the driving circuit 40 includes a first driving unit 401, a second driving unit 402, and a controller 403. The first driving unit 401 is connected to the first half-bridge resonant circuit 10, and is used for driving the first half-bridge resonant circuit 10; the second driving unit 402 is connected to the second half-bridge resonant circuit 20 and is used for driving the second half-bridge resonant circuit 20; the controller 403 is respectively connected to the first driving unit 401, the second driving unit 402, and the switching circuit 30, and is configured to send a first driving instruction to the first driving unit 401, so that the first driving unit 401 drives the first half-bridge resonant circuit to operate according to the first driving instruction; transmitting a second driving instruction to the second driving unit 402, so that the second driving unit 402 drives the second half-bridge resonant circuit to work according to the second driving instruction; the controller 403 is also used to control the switching state of the switching circuit 30.
The controller 403 may be a general purpose processor, a Digital Signal Processor (DSP), an application specific integrated circuit (ASI C), a Field Programmable Gate Array (FPGA), a single chip microcomputer, an ARM (Acorn RI SC MACHI NE) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components. In addition, the controller 403 may be any conventional processor, controller, microcontroller, or state machine. The controller 403 may also be a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP and/or any other such configuration. In this embodiment, the controller 403 is a single-chip microcomputer, for example, a 51-series single-chip microcomputer, etc.
The first driving unit 401 and the second driving unit 402 are connected to the controller 403, and the controller 403 outputs pulse frequency modulation signals to the first driving unit 401 and the second driving unit 402, respectively, and the pulse frequency modulation signals output driving signals after passing through the first driving unit 401 and the second driving unit 402 to control the working states of the first half-bridge resonant circuit 10 and the second half-bridge resonant circuit 20.
In other embodiments, referring to fig. 3, the circuit further includes a first oven plate 50, the first oven plate 50 being connected between the first half-bridge resonant circuit 10 and the switching circuit 30; the first transfer switch 60 is connected in parallel with the first furnace tray 50, the first transfer switch 60 is also connected with the controller 403, and the controller 403 controls the first transfer switch 60 to operate in an on or off state.
Wherein, when the switching circuit 30 is in the second switching state: when the first changeover switch 60 is turned on, the first oven tray 50 is short-circuited by the first changeover switch 60; when the first changeover switch 60 is turned off, the first panel 50 is turned on.
In some embodiments, with continued reference to fig. 3, the circuit further includes a second oven plate 70, the second oven plate 70 being connected between the second half-bridge resonant circuit 20 and the switching circuit 30; the second change-over switch 80 is connected with the second furnace tray 70 in parallel, the second change-over switch 80 is also connected with the controller 403, and the controller 403 controls the second change-over switch 80 to work in an on or off state;
wherein, when the switching circuit 30 is in the second switching state: when the second change-over switch 80 is turned on, the second oven tray 70 is shorted by the second change-over switch 80; when the second transfer switch 80 is turned off, the second oven plate 70 is turned on.
In practical applications, the first transfer switch 60 and the second transfer switch 80 may be any one of a relay, a MOS transistor, a thyristor, or an igbt. In the present application, the first transfer switch 60 and the second transfer switch 80 are relays.
When the switch circuit 30 is in the first switch state, the first half-bridge resonant circuit 10 and the switch circuit 30 form a first half-bridge inverter circuit, the second half-bridge resonant circuit 10 and the switch circuit 30 form a second half-bridge inverter circuit, the first oven tray 50 is connected to the first half-bridge inverter circuit, the first oven tray 70 is connected to the second half-bridge inverter circuit, and at this time, the first oven tray 50 and the second oven tray 70 operate simultaneously, and it can be seen that the first transfer switch 60 and the second transfer switch 80 operate in the off state.
When the switch circuit 30 is in the second switch state, the first half-bridge resonant circuit 10 and the second half-bridge resonant circuit 20 form a full-bridge inverter circuit, and at this time, the controller 403 adjusts the operating states of the first transfer switch 60 and the second transfer switch 80 to operate one load. If the first furnace is adjusted to operate, the first transfer switch 60 is controlled to operate in the off state, and the second transfer switch 80 is correspondingly controlled to operate in the on state.
From the above, the circuit has three modes of operation, the first mode: the first and second reels 50, 70 operate simultaneously in respective half-bridge inverter circuits; second mode: the first furnace tray 50 works in a full-bridge inverter circuit, and the second furnace tray 70 is short-circuited by the second change-over switch 80; third mode: the second oven tray 70 operates in a full bridge inverter circuit, with the first oven tray 50 shorted by the first transfer switch 60.
In this embodiment, the controller 403 controls the operating states of the switch circuit 30, the first transfer switch 60 and the second transfer switch 80 to realize switching of three operating modes, that is, switching of the half-bridge inverter circuit and the full-bridge inverter circuit, so as to maximize the output power when the single load operates.
In some embodiments, referring to fig. 4, the first half-bridge resonant circuit 10 includes a first resonant switch and a second resonant switch, a first capacitor C1 and a second capacitor C2, the first resonant switch is connected in parallel with the first capacitor C1, the second resonant switch is connected in parallel with the second capacitor C2, and the first resonant switch and the first capacitor C1 connected in parallel are connected in series with the second resonant switch and the second capacitor C2 connected in parallel.
In practical applications, the first resonant switch and the second resonant switch may be insulated gate bipolar transistors (I GBT), where the first resonant switch is I GBT1, the second resonant switch is I GBT2, the first driving unit 401 is connected to the G poles of I GBT1 and I GBT2, respectively, and the first driving unit 401 outputs a pulse frequency modulation PFMA signal to I GBT1 to control on and off of I GBT1, and outputs a pulse frequency modulation PFMB signal to I GBT2 to control on and off of I GBT 2.
In other embodiments, referring to fig. 4, the second half-bridge resonant circuit 20 includes a third resonant switch and a fourth resonant switch, a third capacitor C3 and a fourth capacitor C4, the third resonant switch is connected in parallel with the third capacitor C3, the fourth resonant switch is connected in parallel with the fourth capacitor C4, and the third resonant switch and the third capacitor C3 connected in parallel are connected in series with the fourth resonant switch and the fourth capacitor C4 connected in parallel.
In practical applications, the third resonant switch and the fourth resonant switch may be insulated gate bipolar transistors (I GBT), where the third resonant switch is I GBT3, the fourth resonant switch is I GBT4, the second driving unit 402 is connected to the G poles of I GBT3 and I GBT4, respectively, and the second driving unit 402 outputs a pulse frequency modulated PFMC signal to the I GBT3 to control on and off of the I GBT3, and outputs a pulse frequency modulated PFMD signal to the I GBT4 to control on and off of the I GBT 4.
In the present application, the controller 403 controls the operation states of the switching circuit 30, the first transfer switch 60, and the second transfer switch 80 to switch the three operation modes.
First mode: when the switching circuit 30 is in the first switching state and the first changeover switch 60 and the second changeover switch 80 are both in the off state, the first oven tray 50 and the second oven tray 70 operate simultaneously in the respective half-bridge inverter circuits.
Referring to fig. 5, fig. 5 is a pulse frequency modulation signal diagram of a half-bridge inverter circuit according to an embodiment of the present invention, where a first driving unit 401 and a second driving unit 402 output pulse frequency modulated signals to a first half-bridge resonant circuit 10 and a second half-bridge resonant circuit 20, respectively, in a first mode. The following first half-bridge resonant circuit is taken as an example to illustrate the working process of the half-bridge inverter circuit:
The first process comprises the following steps: the first driving unit 10 outputs a pulse frequency modulation signal of PFMA to the I GBT1, the I GBT1 is in a conducting state, the I GBT2 is in a cut-off state, and at the moment, current flows from the I GBT1 to the first stove plate 50 and returns to GND through the switching circuit 30 to form a half-bridge loop;
the second process is as follows: the first driving unit 10 outputs PFMB pulse frequency modulation signals to the I GBT2, the I GBT1 is in an off state, the I GBT2 is in an on state, and at this time, current flows from the switch circuit 30 to the first stove plate 50 and then returns to GND through the I GBT2, so as to form a half-bridge loop.
As can be seen from the above process, the current flowing through the first tray 50 is in opposite directions, and the first process and the second process are continuously circulated, thereby forming a half-bridge inverter circuit, and the conversion of the current signal from AC to DC is achieved by controlling the signals of igbt 1 and igbt 2.
Second mode: the switch circuit 30 is in a second switch state, the first transfer switch 60 is in an off state, the second transfer switch 80 is in an on state, the second oven tray 70 is shorted by the second transfer switch 80, and the first oven tray 50 operates in a full bridge inverter circuit.
Referring to fig. 6, fig. 6 is a pulse frequency modulation signal diagram of a full-bridge inverter circuit according to an embodiment of the present invention, where in the second mode, a first driving unit 401 and a second driving unit 402 output pulse frequency modulated signals to a first half-bridge resonant circuit 10 and a second half-bridge resonant circuit 20, respectively. At this time, the first half-bridge resonant circuit 10 and the second half-bridge resonant circuit 20 constitute a full-bridge inverter circuit:
the first process comprises the following steps: the first driving unit 10 outputs a pulse frequency modulation signal of PFMA to the I GBT1 at first, the second driving unit 20 outputs a pulse frequency modulation signal of PFMD to the I GBT4, in order to make the circuit in an on state, PFMA is the same as the pulse frequency modulation signal of PFMD, at this time, I GBT1 and I GBT4 are in an on state, I GBT2 and I GBT3 are in an off state, current flows from I GBT1 to the first stove plate 50, and returns to GND through I GBT4 via the switching circuit 30, forming a full bridge loop;
the second process is as follows: the first driving unit 10 outputs PFMB pulse frequency modulation signals to the I GBT2 first, the second driving unit 20 outputs PFMC pulse frequency modulation signals to the I GBT4, and in order to make the circuit in the on state, PFMB is the same as PFMC pulse frequency modulation signals, at this time, the I GBT2 and I GBT3 are in the on state, the I GBT1 and I GBT4 are in the off state, and current flows from the I GBT3 to the switching circuit 30, and then returns to GND through the I GBT2 via the first stove plate 50, so as to form a full bridge loop.
As can be seen from the above process, the current flowing through the first tray 50 is in opposite directions, and the first process and the second process are continuously circulated, thereby forming a full-bridge inverter circuit, and the conversion of the current signal from AC to DC is achieved by alternately controlling the signals of the igbt 1 and the igbt 4, and the signals of the igbt 2 and the igbt 3.
Third mode: the switch circuit 30 is in a second switch state, the second changeover switch 80 is in an off state, the first changeover switch 60 is in an on state, the first oven tray 50 is shorted by the first changeover switch 60, and the second oven tray 70 operates in a full bridge inverter circuit. Wherein the pulse frequency modulated signal and the direction signal of the current may refer to the second mode.
In the present embodiment, the switching states of the switching circuit 30, the first transfer switch 60 and the second transfer switch 80 are controlled by the controller 403, and then the first half-bridge resonant circuit 10 and the second half-bridge resonant circuit 20 are driven by the first driving circuit 401 and the second driving circuit 402, respectively, so that the switching between the half-bridge inverter circuit and the full-bridge inverter circuit is completed.
In some embodiments, referring to fig. 7, the switch circuit 30 includes a third switch 301, a first resonant capacitor C30, a second resonant capacitor C31, a third resonant capacitor C33, and a fourth resonant capacitor C34.
When the switch circuit 30 is in the first switch state, the first resonant capacitor C30 and the third resonant capacitor C33 are connected in parallel and then jointly participate in the resonance of the first half-bridge resonant circuit, and the second resonant capacitor C31 and the fourth resonant capacitor C34 are connected in parallel and then jointly participate in the resonance of the second half-bridge resonant circuit. When the switch circuit 30 works in the second switch state, the first resonant capacitor C30 and the second resonant capacitor C31 are connected in series, the third resonant capacitor C33 and the fourth resonant capacitor C34 are connected in series, and the first resonant capacitor C30 and the second resonant capacitor C31 which are connected in series, the third resonant capacitor C33 and the fourth resonant capacitor C34 which are connected in series are connected in parallel and then participate in resonance of the full-bridge inverter circuit together.
The third transfer switch 301 may be any one of a relay, a MOS transistor, a silicon controlled rectifier, or an igbt, and in the present application, the third transfer switch 301 is a double pole double throw relay. The controller 403 controls the third transfer switch 301 to be turned on or off, so that the switching circuit works in an on or off state, wherein the first switch state is that the third transfer switch 301 is in an on state, at this time, the CTR-HV end is connected with the HV end, the CTR-GND end is connected with the GND end, and the whole circuit is divided into a first half-bridge inverter circuit and a second half-bridge inverter circuit at the left end and the right end. The second switch state is that the third transfer switch 301 is in an off state, at this time, the CTR-HV end is disconnected from the HV end, the CTR-GND end is disconnected from the GND end, and the whole circuit is formed by connecting the first half-bridge resonant circuit 10 and the second half-bridge resonant circuit 20 in series through the switch circuit 30.
When the switch circuit 30 is in the first operating state, the circuit is divided into two half-bridge inverter circuits which operate simultaneously, and the output power of the first stove plate 50 is calculated.
When the I GBT1 is conducted and the I GBT2 is cut off, the voltage of the node A is Vds, and the voltage of the node B is Vds/2; when the I GBT2 is turned on and the I GBT1 is turned off, the A node is directly connected with the GND, and the voltage of the B node is Vds/2. That is, in the half-bridge inverter circuit, the current flowing through the first pad 50 is Vds/2 regardless of whether it is a forward current or a reverse current, and the differential pressure formed across the first pad 50 is Vds/2.
When the switch circuit 30 is in the second working state, the first half-bridge resonant circuit 10 and the second half-bridge resonant circuit 20 of the circuit are connected in series through the switch circuit 30 to form a full-bridge inverter circuit, and the output power of the first stove plate 50 is calculated.
When the IGBT1 and the I GBT4 are conducted and the I GBT2 and the I GBT3 are cut off, the voltage of the node A is Vds, and the node D is directly connected with GND; when the I GBT1 and the I GBT4 are cut off and the I GBT2 and the I GBT3 are conducted, the A node is directly connected with the GND node, and the voltage of the D node is Vds. That is, in the full-bridge inverter circuit, the current flowing through the first pad 50 is Vds regardless of whether it is a forward current or a reverse current, and the differential pressure formed across the first pad 50 is Vds.
Under the same conditions and with the same switching frequency, according to the calculation formula p=ui of the power, the output power of the half bridge is p=vds/2*I, the output power of the full bridge is p=vds×i, and obviously, the output power of the first fire plate 50 when the full bridge works is greater than the output power when the half bridge works. Namely, the switching between the half-bridge inverter circuit and the full-bridge inverter circuit is realized by controlling the working state of the switching circuit 30, thereby improving the output power of the circuit.
In some embodiments, the circuit further comprises a first current transformer T1 and a second current transformer T2, wherein the first current transformer T1 is connected in series with the first oven tray 50 and the first switch 60 which are connected in parallel, and meanwhile, the first current transformer T1 is further connected with the controller 403, and is used for feeding back to the controller 403 for pan detection according to a current signal of the first current transformer T1; the second current transformer T2 is connected in series with the second oven tray 70 and the second change-over switch 80 which are connected in parallel, and meanwhile, the second current transformer T2 is also connected with the controller 403, and is used for feeding back to the controller 403 according to a current signal of the second current transformer T2 so as to perform pot inspection.
The embodiment of the invention also provides an induction cooker, which comprises an induction cooker body and a power control circuit of the induction cooker.
Fig. 8 is a block diagram of a power control method according to an embodiment of the present invention, and as shown in fig. 8, the method is applied to the power control circuit, and includes the following steps:
Step 101, acquiring a furnace plate selection instruction;
102, controlling the switching state of the switching circuit according to the stove plate selection instruction;
the fire tray selection instruction includes a first fire tray instruction and a second fire tray instruction, where the first fire tray instruction instructs the controller 403 to control the switch circuit 30 to operate in the first switch state, and the second fire tray instruction instructs the controller 403 to control the switch circuit 30 to operate in the second switch state.
Step 103, if the instruction is a first stove selection instruction, the switch circuit works in a first switch state, the first half-bridge resonance circuit and the switch circuit form a first half-bridge inverter circuit, and the second half-bridge resonance circuit and the switch circuit form a second half-bridge inverter circuit;
step 104, if the instruction is a second oven tray selection instruction, the switch circuit works in a second switch state, and the first half-bridge resonance circuit and the second half-bridge resonance circuit form a full-bridge inverter circuit.
When the tray selection instruction is the first tray selection instruction, the driving circuit 40 controls the operating state of the switching circuit 30, and when the switching circuit 30 operates in the first switching state, the first half-bridge resonant circuit 10 and the switching circuit 30 form a first half-bridge inverter circuit, and the second half-bridge resonant circuit 20 and the switching circuit 30 form a second half-bridge inverter circuit, so that the circuits operate respectively for the two half-bridge inverter circuits.
When the fire tray selection command is the second fire tray selection command, the driving circuit 40 controls the switching circuit 30 to operate in the second switching state, and at this time, the first half-bridge resonant circuit 10 and the second half-bridge resonant circuit 20 form a full-bridge inverter circuit.
The first switch state is a switch-on state of the switch circuit 30, and at this time, the first half-bridge resonant circuit 10 and the second half-bridge resonant circuit 20 are connected in parallel, so that the first half-bridge resonant circuit 10 and the second half-bridge resonant circuit 20 respectively form a half-bridge inverter circuit with the switch circuit 30 to respectively operate. The second switching state is that the switching circuit 30 is in a switching off state, and the first half-bridge resonant circuit 10 is connected with the second half-bridge resonant circuit 20 through the switching circuit 30, so that the first half-bridge resonant circuit 10 and the second half-bridge resonant circuit 20 are connected in series through the switching circuit 30 to form a full-bridge inverter circuit.
In this embodiment, power control of the circuit is achieved by obtaining different fire plate selection instructions. The driving circuit 40 controls the operating state of the switching circuit 30 to adjust the connection relationship between the first half-bridge resonant circuit and the second resonant circuit, thereby realizing the switching from the half-bridge inverter circuit to the full-bridge inverter circuit, and improving the output power of the circuit.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the application, the steps may be implemented in any order, and there are many other variations of the different aspects of the application as described above, which are not provided in detail for the sake of brevity; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims (7)

1. A power control circuit for an induction cooker, the power control circuit comprising:
A first half-bridge resonant circuit;
A second half-bridge resonant circuit;
a switching circuit connected between the first half-bridge resonant circuit and the second half-bridge resonant circuit; and
The driving circuit is respectively connected with the first half-bridge resonant circuit, the second half-bridge resonant circuit and the switch circuit;
when the driving circuit controls the switching circuit to work in a first switching state, the first half-bridge resonant circuit and the switching circuit form a first half-bridge inverter circuit, and the second half-bridge resonant circuit and the switching circuit form a second half-bridge inverter circuit;
when the driving circuit controls the switching circuit to work in a second switching state, the first half-bridge resonance circuit and the second half-bridge resonance circuit form a full-bridge inverter circuit;
The driving circuit includes:
the first driving unit is connected with the first half-bridge resonant circuit;
The second driving unit is connected with the second half-bridge resonant circuit; and
The controller is respectively connected with the first driving unit, the second driving unit and the switching circuit and is used for sending a first driving instruction to the first driving unit so that the first driving unit drives the first half-bridge resonant circuit to work according to the first driving instruction and sending a second driving instruction to the second driving unit so that the second driving unit drives the second half-bridge resonant circuit to work according to the second driving instruction, and the controller is also used for controlling the switching state of the switching circuit;
The power control circuit includes:
a first oven tray connected between the first half-bridge resonant circuit and the switching circuit;
the first change-over switch is connected with the first furnace tray in parallel, and is also connected with the controller, and the controller is used for controlling the first change-over switch to work in an on or off state;
On the premise that the switching circuit is in the second switching state:
when the first transfer switch is turned on, the first furnace plate is short-circuited by the first transfer switch;
when the first transfer switch is turned off, an inverter current flows through the first oven tray;
The power control circuit further includes:
The second furnace plate is connected between the second half-bridge resonance circuit and the switch circuit;
The second change-over switch is connected with the second furnace plate in parallel, and is also connected with the controller, and the controller controls the second change-over switch to work in an on or off state;
On the premise that the switching circuit is in the second switching state:
when the second transfer switch is conducted, the second furnace plate is short-circuited by the second transfer switch;
When the second transfer switch is turned off, an inverter current flows through the second tray.
2. The power control circuit of claim 1, wherein the first half-bridge resonant circuit comprises first and second resonant switches, a first capacitor, and a second capacitor;
The first resonant switch is connected with the first capacitor in parallel, the second resonant switch is connected with the second capacitor in parallel, and the first resonant switch and the first capacitor which are connected in parallel are connected with the second resonant switch and the second capacitor which are connected in series.
3. The power control circuit of claim 1, wherein the second half-bridge resonant circuit comprises third and fourth resonant switches, third and fourth capacitors;
the third resonant switch is connected with the third capacitor in parallel, the fourth resonant switch is connected with the fourth capacitor in parallel, and the third resonant switch and the third capacitor which are connected in parallel are connected with the fourth resonant switch and the fourth capacitor which are connected in series.
4. The power control circuit of claim 1, wherein the switching circuit comprises a third transfer switch, a first resonant capacitor, a second resonant capacitor, a third resonant capacitor, and a fourth resonant capacitor;
When the switch circuit works in a first switch state, the first resonant capacitor and the third resonant capacitor are connected in parallel and jointly participate in the resonance of the first half-bridge resonant circuit, and the second resonant capacitor and the fourth resonant capacitor are connected in parallel and jointly participate in the resonance of the second half-bridge resonant circuit;
When the switching circuit works in a second switching state, the first resonant capacitor and the second resonant capacitor are connected in series, the third resonant capacitor and the fourth resonant capacitor are connected in series, and the first resonant capacitor and the second resonant capacitor which are connected in series, the third resonant capacitor and the fourth resonant capacitor which are connected in series are connected in parallel and then participate in resonance of the full-bridge inverter circuit together.
5. The power control circuit of claim 1, further comprising a first current transformer and a second current transformer;
The first current transformer is connected with the first furnace plate and the first conversion switch in series;
the second current transformer is connected with the second furnace plate and the second change-over switch in series.
6. An induction hob, characterized in, that it comprises an induction hob body and a power control circuit of an induction hob according to any one of the claims 1 to 5.
7. A power control method applied to the power control circuit according to any one of claims 1 to 5, characterized in that the method comprises:
acquiring a furnace plate selection instruction;
According to the furnace plate selection instruction, controlling the switching state of the switching circuit;
If the instruction is a first stove selection instruction, the switch circuit works in a first switch state, the first half-bridge resonance circuit and the switch circuit form a first half-bridge inverter circuit, and the second half-bridge resonance circuit and the switch circuit form a second half-bridge inverter circuit;
And if the instruction is a second oven tray selection instruction, the switch circuit works in a second switch state, and the first half-bridge resonance circuit and the second half-bridge resonance circuit form a full-bridge inverter circuit.
CN201910712969.4A 2019-08-02 2019-08-02 Power control circuit and method and induction cooker Active CN110493905B (en)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
JPH09251888A (en) * 1995-12-27 1997-09-22 Lg Electron Inc Dual half bridge type electronic induction heating cooker for multiple output control
CN203563223U (en) * 2013-11-21 2014-04-23 张辉兵 Frequency modulation circuit of induction cooker
CN204131763U (en) * 2014-09-30 2015-01-28 深圳市鑫汇科股份有限公司 A kind of half-bridge multiple head switches Electromechanically heating controller
CN210807706U (en) * 2019-08-02 2020-06-19 深圳麦格米特电气股份有限公司 Power control circuit and induction cooker

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09251888A (en) * 1995-12-27 1997-09-22 Lg Electron Inc Dual half bridge type electronic induction heating cooker for multiple output control
CN203563223U (en) * 2013-11-21 2014-04-23 张辉兵 Frequency modulation circuit of induction cooker
CN204131763U (en) * 2014-09-30 2015-01-28 深圳市鑫汇科股份有限公司 A kind of half-bridge multiple head switches Electromechanically heating controller
CN210807706U (en) * 2019-08-02 2020-06-19 深圳麦格米特电气股份有限公司 Power control circuit and induction cooker

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IGBT串联谐振逆变电阻点焊机的研究与改进;刘晓东;杨艳;李方元;王景兵;;电气技术(第05期);全文 *

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