CN108738179B - Electromagnetic heating device and control method thereof - Google Patents
Electromagnetic heating device and control method thereof Download PDFInfo
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- CN108738179B CN108738179B CN201710245963.1A CN201710245963A CN108738179B CN 108738179 B CN108738179 B CN 108738179B CN 201710245963 A CN201710245963 A CN 201710245963A CN 108738179 B CN108738179 B CN 108738179B
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- pulse width
- electromagnetic heating
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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
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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
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
Abstract
The invention discloses a control method of an electromagnetic heating device, which comprises the following steps: outputting an initial pulse width modulation signal according to the target current signal to drive a power switch module of the electromagnetic heating device; obtaining a plurality of different pulse widths according to the pulse width of the initial pulse width modulation signal; and alternately outputting pulse width modulation signals with a plurality of different pulse widths to the power switch module according to a preset period. The control method of the electromagnetic heating device can reduce the dominant frequency electromagnetic radiation intensity of the electromagnetic heating device and improve the electromagnetic compatibility. The invention also discloses an electromagnetic heating device.
Description
Technical Field
The invention belongs to the technical field of electric appliance manufacturing, and particularly relates to a control method of an electromagnetic heating device and the electromagnetic heating device.
Background
The existing electromagnetic products such as an electromagnetic oven are all that commercial power is rectified and filtered into direct current, and then the direct current is inverted into high-frequency oscillation signals through an inverter to heat a pot. The inverter mainly includes an LC oscillator and a switching tube such as an Insulated Gate Bipolar Transistor (IGBT), and the LC oscillator is continuously oscillated by controlling an IGBT switch.
At present, for the whole mains supply envelope of 10 milliseconds, the Pulse Width of a PWM (Pulse Width Modulation) signal for controlling an IGBT is fixed, and if an electromagnetic product goes to a country which needs to meet the FCC PART18 standard requirement, the fixed PWM Pulse Width may cause that the electromagnetic product has an excessively high main-frequency radiation field strength and poor electromagnetic compatibility in a LOOP test of an RE (radio interference). In the related art, a scheme for changing frequency is proposed, in which a PWM signal is changed by controlling the change of the PWM with current, that is, controlling the PWM with current as a control parameter, but the method has fluctuation of several tens of watts and poor stability.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the present invention needs to provide a control method for an electromagnetic heating device, which can effectively reduce the dominant frequency radiation intensity of the electromagnetic heating device and improve the electromagnetic compatibility.
The invention also provides an electromagnetic heating device.
In order to solve the above problem, an aspect of the present invention provides a method for controlling an electromagnetic heating apparatus, including: outputting an initial pulse width modulation signal according to the target current signal to drive a power switch module of the electromagnetic heating device; obtaining a plurality of different pulse widths according to the pulse width of the initial pulse width modulation signal; and alternately outputting the pulse width modulation signals with the different pulse widths to the power switch module according to a preset period.
The control method of the electromagnetic heating device in the embodiment of the invention is different from the method that the current is taken as the control variable to obtain the variable PWM signal, the pulse width is directly taken as the control variable, the PWM signal with the variable pulse width is used for controlling the on-off of the power switch module, the main frequency electromagnetic radiation intensity of the electromagnetic heating device is effectively reduced, and the electromagnetic compatibility is improved.
In some embodiments of the present invention, during the current heating cycle, the sum of the plurality of different pulse widths is equal to the pulse width of the initial pulse width modulation signal.
In some embodiments of the invention, the plurality of different pulse widths comprises a first pulse width and a second pulse width.
In some embodiments of the present invention, the first pulse width is less than the pulse width of the initial pulse width modulated signal by a first width value and the second pulse width is greater than the pulse width of the initial pulse width modulated signal by a second width value.
In some embodiments of the present invention, 1 unit ≦ 3 units for the first width value, and 1 unit ≦ 3 units for the second width value.
In order to solve the above problem, another aspect of the present invention provides an electromagnetic heating apparatus, including: a power switch module; the register module is used for registering a plurality of different pulse widths; the control module is used for outputting an initial pulse width modulation signal according to the target current so as to drive the power switch module to be switched on and off, obtaining a plurality of different pulse widths according to the pulse width of the initial pulse width modulation signal, and alternately outputting the pulse width modulation signals with the different pulse widths to the power switch module according to a preset period.
The electromagnetic heating device of the embodiment of the invention is different from the electromagnetic heating device which takes the current as the control variable to obtain the variable PWM signal, directly takes the pulse width as the control variable, realizes the control of the on-off of the power switch module by the PWM signal with the variable pulse width, effectively reduces the electromagnetic radiation intensity of the main frequency and improves the electromagnetic compatibility.
In some embodiments of the present invention, during the current heating cycle, the sum of the plurality of different pulse widths is equal to the pulse width of the initial pulse width modulation signal.
In some embodiments of the invention, the register module comprises: the pulse width control circuit comprises a first register unit and a second register unit, wherein the first register unit is used for registering a first pulse width, and the second register unit is used for registering a second pulse width.
In some embodiments of the present invention, the first pulse width is less than the pulse width of the initial pulse width modulated signal by a first width value and the second pulse width is greater than the pulse width of the initial pulse width modulated signal by a second width value.
In some embodiments of the present invention, 1 unit ≦ 3 units for the first width value, and 1 unit ≦ 3 units for the second width value.
In some embodiments of the invention, the electromagnetic heating device comprises an induction cooker
Drawings
Fig. 1 is a flowchart of a control method of an electromagnetic heating apparatus according to an embodiment of the present invention;
FIG. 2 is a diagram of a waveform of radiation intensity driven by a fixed pulse width PWM signal in the related art;
FIG. 3 is a schematic diagram of a waveform of radiation intensity driven by a PWM signal of varying pulse width according to an embodiment of the present invention;
fig. 4 is a flowchart of a control method of an electromagnetic heating apparatus according to an embodiment of the present invention; and
fig. 5 is a block diagram of an electromagnetic heating apparatus according to an embodiment of the present invention.
Reference numerals:
an electromagnetic heating device 100;
a power switch module 10, a register module 20 and a control module 30.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An electromagnetic heating apparatus and a control method thereof proposed according to an embodiment of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a control method of an electromagnetic heating apparatus according to an embodiment of the present invention, which includes the steps of, as shown in fig. 1:
and S1, outputting an initial pulse width modulation signal according to the target current signal to drive a power switch module of the electromagnetic heating device.
Specifically, after an electromagnetic heating device, such as an induction cooker, is powered on, a given target current signal is selectively operated by heating power, and normally, when the start of heating is detected, the on/off of a power switch module, such as an IGBT, is adjusted according to the target current signal and an actual current signal, and the pulse width of a PWM signal for driving the IGBT is adjusted to reach the target heating power.
In the embodiment of the invention, when the cooker is detected to start heating, the power switch module is directly driven by the initial pulse width modulation signal, and the initial pulse width modulation signal is generated according to the target current.
S2, a plurality of different pulse widths are obtained according to the pulse width of the initial pwm signal.
Specifically, after the target heating power is reached, the pulse width of the initial pulse width modulation signal is distributed into a plurality of different pulse widths, and the distribution principle can ensure that, in the current heating cycle, the PWM signals with the obtained plurality of different pulse widths are alternately output to drive the power switch module, and the average heating power of the power switch module driven by the initial pulse width modulation signal is equivalent to the average heating power of the power switch module driven by the initial pulse width modulation signal. During the heating cycle, a plurality of different pulse widths can be obtained and temporarily stored in a register.
S3, alternately outputting the pwm signals with the different pulse widths to the power switch module according to a preset period.
Specifically, the power switch module is driven by an initial pulse width modulation signal, after the target heating power is reached, the pulse width of a pulse width adjustment signal of the power switch module is changed, and pulse width modulation signals with different pulse widths are alternately output to control the on-off of the power switch module, so that the resonance module continuously oscillates and heats, namely, the power switch module is driven by the changed pulse width modulation signal by directly taking the pulse width as a control variable. That is, the pulse width of the pulse modulation signal finally output in each heating period is changed, and thus the resonance frequency is also changed, so that the intensity of each frequency point, that is, the intensity of the Magnetic field radiation in a single frequency band can be reduced, and the EMC (electromagnetic Compatibility) can be effectively improved.
It should be noted that the preset period may be set as needed, and a plurality of pulse widths with different pulse width values are alternately output according to the preset period, and specifically, the alternate frequency may be changed as needed or as the case may be, for example, the pulse width of the pwm signal may be changed once every preset period, or the pulse width of the pwm signal may be changed once every several preset periods, which is not limited herein.
Fig. 2 is a schematic diagram showing a waveform of magnetic field radiation intensity driven by a PWM signal with a fixed pulse width in the related art; fig. 3 is a schematic diagram of a magnetic field radiation mild waveform driven with a PWM signal of varying pulse width in accordance with one embodiment of the present invention.
It can be seen that, the control method of the electromagnetic heating device in the embodiment of the present invention is different from the method in which the current is used as the control variable to obtain the changed PWM signal, and the pulse width is directly used as the control variable to control the on/off of the power switch module by using the PWM signal with the changed pulse width, so that the main frequency electromagnetic radiation intensity of the electromagnetic heating device is effectively reduced, and the electromagnetic compatibility is improved.
In some embodiments of the present invention, during the heating cycle, a sum of a plurality of different pulse widths obtained from the pulse width of the initial pwm signal is equal to the pulse width value of the initial pwm signal. For example, the PWM signals of two different pulse widths are alternately output every preset period, that is, the plurality of pulse widths include a first pulse width and a second pulse width. The pulse width of the initial pwm signal is set to PPG _ TEMP, and the two pulse widths obtained from PPG _ TEMP are set to PPGA and PPGB, respectively, so that PPGA + PPGB is satisfied as PPG _ TEMP in the entire heating cycle, and at this time, the pwm signals having PPGA and PPGB are alternately output, and the resonance frequency is in an alternately changing state.
The first pulse width is smaller than the pulse width of the initial pulse width modulation signal by a first width value, and the second pulse width is larger than the pulse width of the initial pulse width modulation signal by a second width value. In some embodiments of the invention, the first width value and the second width value satisfy: 1 unit ≦ first width value ≦ 3 units, 1 unit ≦ second width value ≦ 3 units, where "unit" is a unit of pulse width, such as milliseconds or microseconds. For example, the first width value is selected to be 2 microseconds and the second width value is selected to be 2 microseconds, i.e. the first pulse width is 2 microseconds less than the pulse width of the initial pwm signal and the second pulse width is 2 microseconds more than the pulse width of the initial pwm signal.
Fig. 4 is a flowchart illustrating a control method of an electromagnetic heating apparatus according to an embodiment of the present invention, and fig. 4 illustrates a control method of an electromagnetic heating apparatus, including:
and S100, setting a target current.
And S110, outputting a PWM signal of PPG _ TEMP to control the on-off of the IGBT.
And S120, assigning the PPG _ TEMP to the PPGA and the PPGB, namely assigning the PPG _ TEMP to the PPGA and the PPGB.
S130, judging whether the current preset period is 2N +1 or not, wherein N is more than or equal to 0. If so, the process proceeds to step S140, otherwise, the process proceeds to step S150.
And S140, outputting a PWM signal with pulse width of PPGA.
And S150, outputting a PWM signal with pulse width of PPGB.
That is, PWM signals having pulse widths of PPGA and PPGB are alternately output in a predetermined cycle, wherein the PWM signal having a pulse width of PPGA is output in an odd cycle, and the PWM signal having a pulse width of PPGB is output in an even cycle, so that the oscillation frequency is alternately changed, the intensity at each frequency point is reduced, and the intensity of the magnetic field radiation in the environment is effectively reduced.
And S160, judging whether the heating cycle is finished or not, if so, finishing, and if not, returning to the step S130.
It can be understood that, if the on-off of the IGBT is controlled by two PWM signals with different pulse widths, and the problem of excessively high radiation intensity of the main frequency is not improved much, the pulse width of the initial pulse width modulation signal can be distributed into more variable pulse widths according to the requirement, and PWM signals with more widths are alternately output, so as to achieve the effect of better reducing the radiation intensity of the main frequency and improve the electromagnetic compatibility.
In summary, in the control method of the electromagnetic heating apparatus according to the embodiment of the present invention, the pulse width of the PWM signal is used as a direct control variable, and the pulse width of the PWM signal is always changed in the heating period, so that the oscillation frequency is continuously changed, and thus the electromagnetic compatibility of the product can be improved.
An electromagnetic heating apparatus according to another aspect of the embodiment of the present invention is described below with reference to fig. 5.
Fig. 5 is a block diagram of an electromagnetic heating apparatus according to an embodiment of the present invention, and as shown in fig. 5, the electromagnetic heating apparatus 100 includes a power switch module 10, a register module 20, and a control module 30.
The electromagnetic heating device 100 of the embodiment of the present invention may include, but is not limited to, an electromagnetic oven, and the power switch module 10 is turned on and off according to the driving of the pulse width modulation signal, so that the resonance module generates oscillation to realize the heating of the cookware.
The register module 20 is used for registering a plurality of different pulse widths.
The control module 30 is configured to output an initial pulse width modulation signal according to the target current to drive the power switch module 10 to be turned on or off, obtain a plurality of different pulse widths according to a pulse width of the initial pulse width modulation signal, and alternately output a plurality of pulse width modulation signals with different pulse widths to the power switch module 10 according to a preset period. That is, the pulse width is directly used as a control variable, so that the power switch module 10 is driven by a variable pulse width modulation signal. That is, the pulse width of the pulse width modulation signal finally output in each heating cycle is changed, and thus the resonance frequency is also in a changed state, so that the intensity at each frequency point can be reduced, and the magnetic field radiation intensity of the EMC can be effectively reduced.
The electromagnetic heating device 100 of the embodiment of the invention is different from the method that the current is used as the control variable to obtain the variable PWM signal, and the pulse width is directly used as the control variable, so that the PWM signal with the variable pulse width is used for controlling the on-off of the power switch module 10, the main frequency electromagnetic radiation intensity is effectively reduced, and the electromagnetic compatibility is improved.
In some embodiments of the present invention, during the heating cycle, a sum of a plurality of different pulse widths obtained from the pulse width of the initial pwm signal is equal to the pulse width value of the initial pwm signal. For example, taking the example of alternately outputting two PWM signals with different pulse widths every preset period, the register module 20 includes a first register unit 21 and a second register unit 22, where the first register unit 21 is used for registering a first pulse width, and the second register unit 22 is used for registering a second pulse width, and then the sum of the first pulse width and the second pulse width is equal to the pulse width value of the initial pulse width modulation signal in the whole heating period, and at this time, the pulse width modulation signals with the first pulse width and the second pulse width are alternately output, and the resonance frequency will be in an alternate state.
The first pulse width is smaller than the pulse width of the initial pulse width modulation signal by a first width value, and the second pulse width is larger than the pulse width of the initial pulse width modulation signal by a second width value. In some embodiments of the invention, the first width value and the second width value satisfy: 1 unit ≦ first width value ≦ 3 units, 1 unit ≦ second width value ≦ 3 units, where "unit" is a unit of pulse width, such as milliseconds or microseconds. For example, the first width value is selected to be 2 microseconds and the second width value is selected to be 2 microseconds, i.e. the first pulse width is 2 microseconds less than the pulse width of the initial pwm signal and the second pulse width is 2 microseconds more than the pulse width of the initial pwm signal.
It can be understood that, if the on-off of the IGBT is controlled by two PWM signals with different pulse widths, and the problem of excessively high radiation intensity of the main frequency is not improved much, the pulse width of the initial pulse width modulation signal can be distributed into more variable pulse widths according to the requirement, and PWM signals with more widths are alternately output, so as to achieve the effect of better reducing the radiation intensity of the main frequency and improve the electromagnetic compatibility.
It should be noted that in the description of the present specification, any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and that the scope of the preferred embodiments of the present invention includes additional implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. A control method of an electromagnetic heating apparatus, characterized by comprising:
outputting an initial pulse width modulation signal according to the target current signal to drive a power switch module of the electromagnetic heating device;
obtaining a plurality of different pulse widths according to the pulse width of the initial pulse width modulation signal; and
alternately outputting pulse width modulation signals with a plurality of different pulse widths to the power switch module according to a preset period; in the heating period, the sum of the different pulse widths is equal to the pulse width of the initial pulse width modulation signal.
2. The control method of an electromagnetic heating apparatus according to claim 1, wherein the plurality of different pulse widths include a first pulse width and a second pulse width.
3. The control method of an electromagnetic heating apparatus according to claim 2, wherein the first pulse width is smaller than the pulse width of the initial pulse width modulation signal by a first width value, and the second pulse width is larger than the pulse width of the initial pulse width modulation signal by a second width value.
4. The control method of an electromagnetic heating apparatus according to claim 3, wherein 1 unit ≦ the first width value ≦ 3 units, 1 unit ≦ the second width value ≦ 3 units.
5. An electromagnetic heating device, comprising:
a power switch module;
the register module is used for registering a plurality of different pulse widths;
the control module is used for outputting an initial pulse width modulation signal according to the target current so as to drive the power switch module to be switched on and off, obtaining a plurality of different pulse widths according to the pulse width of the initial pulse width modulation signal, and alternately outputting the pulse width modulation signals with the different pulse widths to the power switch module according to a preset period; in the heating period, the sum of the different pulse widths is equal to the pulse width of the initial pulse width modulation signal.
6. The electromagnetic heating apparatus of claim 5, wherein the register module comprises:
the pulse width control circuit comprises a first register unit and a second register unit, wherein the first register unit is used for registering a first pulse width, and the second register unit is used for registering a second pulse width.
7. The electromagnetic heating apparatus of claim 6, wherein the first pulse width is less than the pulse width of the initial pulse width modulated signal by a first width value and the second pulse width is greater than the pulse width of the initial pulse width modulated signal by a second width value.
8. The electromagnetic heating device according to claim 7, wherein 1 unit ≦ the first width value ≦ 3 units, and 1 unit ≦ the second width value ≦ 3 units.
9. Electromagnetic heating apparatus as claimed in any of claims 5 to 8, wherein said electromagnetic heating apparatus comprises an induction cooker.
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| DE102006041964A1 (en) * | 2006-08-25 | 2008-04-03 | E.G.O. Elektro-Gerätebau GmbH | Method and arrangement for supplying power to an induction heater |
| CN203313438U (en) * | 2013-05-21 | 2013-11-27 | 美的集团股份有限公司 | An induction cooker and a control circuit thereof |
| CN104244481B (en) * | 2013-06-14 | 2016-02-10 | 美的集团股份有限公司 | The method for heating and controlling of electromagnetic induction heater and electromagnetic induction heater |
| CN104902600B (en) * | 2014-03-06 | 2018-03-16 | 美的集团股份有限公司 | Electromagnetic heater and its control method |
| EP3151631B1 (en) * | 2015-10-02 | 2018-06-13 | Electrolux Appliances Aktiebolag | Induction heating method and system |
| CN205232039U (en) * | 2015-10-14 | 2016-05-11 | 深圳市英威腾交通技术有限公司 | Converter main circuit and converter |
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