CN114698172B

CN114698172B - Electromagnetic heating equipment and power control method and power control device thereof

Info

Publication number: CN114698172B
Application number: CN202011591759.3A
Authority: CN
Inventors: 曾露添; 朱成彬; 雷俊; 江德勇; 刘文华; 王云峰
Original assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2023-01-24
Anticipated expiration: 2040-12-29
Also published as: CN114698172A

Abstract

The invention discloses electromagnetic heating equipment, a power control method and a power control device thereof, wherein the power control method of the electromagnetic heating equipment comprises the following steps: when the plurality of heating modules of the electromagnetic heating equipment work at the same time, acquiring the input power of each heating module, and determining the type of the corresponding heating module according to the input power of each heating module when the input powers of the plurality of heating modules are different; and controlling the output power of the corresponding heating module by adopting different power regulation modes according to the type of each heating module. The power control method provided by the embodiment of the invention is beneficial to realizing the frequency consistency of a plurality of heating modules which work simultaneously, so that the situation that a plurality of frequencies are mixed together to generate a synthesized frequency in the working process is avoided, the situation that a difference frequency signal is synthesized to generate sharp and harsh noise is avoided, and the use experience of a user is improved.

Description

Electromagnetic heating equipment and power control method and power control device thereof

Technical Field

The invention relates to the technical field of electromagnetic heating equipment, in particular to electromagnetic heating equipment and a power control method and a power control device thereof.

Background

In the related art, the output power of the burners is usually adjusted by the same adjusting method, so that when a plurality of burners are heated simultaneously, the working frequencies of the burners are usually inconsistent, a plurality of frequencies are mixed together to generate a series of synthetic frequencies, wherein the synthesized difference frequency signals generate sharp and harsh noises, which are often unacceptable to users, and the user experience is greatly reduced.

For example, in some related technologies, the output power is controlled by adjusting the operating frequency of the burners, so that when a plurality of burners heat simultaneously, the operating frequency of each burner is different due to different power required by each burner, resulting in loud noise.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a power control method of electromagnetic heating equipment, which is beneficial to realizing the frequency consistency of a plurality of heating modules which work simultaneously, thereby being beneficial to reducing the noise caused by difference frequency.

The invention also provides a computer readable storage medium.

The invention also provides electromagnetic heating equipment capable of realizing the power control method.

The invention also provides a power control device of the electromagnetic heating equipment.

In order to achieve the above object, an embodiment of the present invention provides a power control method for an electromagnetic heating device, including the following steps: when the plurality of heating modules of the electromagnetic heating equipment are determined to work simultaneously, the input power of each heating module is obtained, and the type of the corresponding heating module is determined according to the input power of each heating module when the input powers of the plurality of heating modules are different; and controlling the output power of the corresponding heating module by adopting different power regulation modes according to the type of each heating module.

According to the power control method of the electromagnetic heating equipment, disclosed by the embodiment of the invention, the output power is controlled by adopting different power regulation modes for different types of heating modules, so that the frequency consistency of a plurality of heating modules which work simultaneously is favorably realized, the synthetic frequency generated by mixing a plurality of frequencies in the working process is avoided, the sharp and harsh noise generated by synthesizing a difference frequency signal is avoided, and the use experience of a user is favorably improved.

In addition, the power control method of the electromagnetic heating apparatus according to the above-described embodiment of the present invention may further have the following additional technical features:

according to some embodiments of the present invention, the types of heating modules comprise a master heating module and a slave heating module, wherein determining the type of the corresponding heating module from the input power of each heating module comprises: and acquiring the heating module with the maximum input power from the plurality of heating modules, taking the heating module with the maximum input power as a main heating module, and taking the rest heating modules from the plurality of heating modules as slave heating modules.

According to some embodiments of the present invention, controlling the output power of each heating module in different power adjusting manners according to the type of the heating module includes: when the current heating module is determined to be a main heating module, controlling the output power of the main heating module by adopting a frequency modulation power regulation mode; and when the current heating module is determined to be the slave heating module, controlling the output power of the slave heating module by adopting a power regulation mode of regulating the duty ratio.

According to some embodiments of the present invention, controlling the output power of the main heating module by using a frequency-modulated power adjustment method includes: the method comprises the steps of outputting a first PWM signal with a fixed duty ratio to the main heating module, and controlling the output power of the main heating module by adjusting the frequency of the first PWM signal.

According to some embodiments of the present invention, controlling the output power of the slave heating module by a duty-adjusted power adjustment method includes: and outputting a second PWM signal with fixed frequency to the slave heating module, and controlling the output power of the slave heating module by adjusting the duty ratio of the second PWM signal.

According to some embodiments of the invention, the frequency of the second PWM signal is the same as the frequency of the first PWM signal.

According to some embodiments of the invention, the fixed duty cycle is 50% and the duty cycle of the second PWM signal is adjustable from 0 to 50%.

According to some embodiments of the present invention, when it is determined that the electromagnetic heating device only has one heating module to operate, the output power of the heating module is controlled by using a frequency-modulated power regulation manner.

In order to achieve the above object, an embodiment of the present invention provides a computer-readable storage medium, on which a power control program of an electromagnetic heating apparatus is stored, the power control program of the electromagnetic heating apparatus implementing a power control method of the electromagnetic heating apparatus according to an embodiment of the present invention when executed by a processor.

In order to achieve the above object, an embodiment of the present invention provides an electromagnetic heating apparatus, including a memory, a processor, and a power control program of the electromagnetic heating apparatus stored in the memory and executable on the processor, where when the processor executes the power control program, the power control method of the electromagnetic heating apparatus according to the embodiment of the present invention is implemented.

In order to achieve the above object, an embodiment of the present invention provides a power control apparatus for an electromagnetic heating device, including: the determining module is used for acquiring the input power of each heating module when the plurality of heating modules of the electromagnetic heating equipment are determined to work simultaneously, and determining the type of the corresponding heating module according to the input power of each heating module when the input powers of the plurality of heating modules are different; and the power control module is used for controlling the output power of the corresponding heating module by adopting different power regulation modes according to the type of each heating module.

According to the power control device of the electromagnetic heating equipment, disclosed by the embodiment of the invention, the output power is controlled by adopting different power regulation modes for different types of heating modules, so that the frequency consistency of a plurality of heating modules which work simultaneously is favorably realized, the synthetic frequency generated by mixing a plurality of frequencies in the working process is avoided, the sharp and harsh noise generated by synthesizing difference frequency signals is avoided, and the use experience of a user is favorably improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of a power control apparatus according to some embodiments of the invention;

FIG. 2 is a schematic flow diagram of a method of power control of an electromagnetic heating apparatus according to some embodiments of the present invention;

FIG. 3 is a flow chart illustrating a step S1 of a power control method according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a power control device and heating module according to a particular embodiment of the present invention;

FIG. 5 is a graph of PWM frequency versus output power for a main heating module according to an embodiment of the present invention;

FIG. 6 is a flow chart of controlling the output power of the main heating module using frequency modulated power regulation in accordance with an embodiment of the present invention;

FIG. 7 is a PWM waveform diagram of a power control apparatus outputting a main heating module according to an embodiment of the present invention;

FIG. 8 is a graph of duty cycle versus output power for the slave heater modules in the case where the half-bridge switching tube PWM frequency of the slave heater module is equal to that of the master heater module in accordance with an embodiment of the present invention;

FIG. 9 is a flow chart of controlling the output power from the heating module using a duty-adjusted power adjustment according to an embodiment of the present invention;

FIG. 10 is a PWM waveform diagram of a power control apparatus outputting a master heating module and a slave heating module according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of a power control apparatus according to further embodiments of the present invention;

FIG. 12 is a schematic flow diagram of a method of power control for an electromagnetic heating apparatus according to further embodiments of the present invention;

FIG. 13 is a schematic diagram of a power control device and heating module according to another particular embodiment of the present invention;

FIG. 14 is a waveform diagram illustrating operation of a slave heating module in accordance with an embodiment of the present invention;

FIG. 15 is a waveform illustrating operation of the continuous heating control mode and the lost wave heating control mode according to an embodiment of the present invention;

FIG. 16 is a flow chart of controlling the upper bridge switching tube by a lost wave heating control method according to an embodiment of the present invention.

Description of the drawings:

a power control device 100; a heating module 50;

a determination module 10; a power control module 20; a first determination module 30; a second determination module 40;

a first heating module 200; a first driving module 201; a first upper bridge switching tube 202; a first lower bridge switching tube 203; a first heating coil 204; a first pair of

resonant capacitors

205, 206; a first half-bridge midpoint voltage detection module 207;

a second heating module 300; a second driving module 301; a second upper bridge switching tube 302; a second lower bridge switching tube 303; a second heating coil 304; a second pair of

resonant capacitors

305, 306; a second half-bridge midpoint voltage detection module 307;

a zero crossing detection module 101.

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 reference numerals refer to the same or similar elements or elements having the same or similar functions 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, a power control method thereof, and a power control device 100 according to an embodiment of the present invention are described below with reference to the drawings.

The plurality of heating modules 50 (the number of heating modules 50 is two or more) of the electromagnetic heating apparatus may correspond to a plurality of heating zones, which may be used for heating of a plurality of appliances to simultaneously perform a plurality of cooking processes. The electromagnetic heating device here may be a multi-head induction cooker or the like, and the heating module 50 may include a heating coil or the like.

A power control method of an electromagnetic heating apparatus according to an embodiment of the first aspect of the present invention and a power control device 100 of an electromagnetic heating apparatus according to an embodiment of the second aspect of the present invention are described below with reference to fig. 1 to 10.

As shown in fig. 1, a power control apparatus 100 of an electromagnetic heating device includes: a determination module 10 and a power control module 20. The determining module 10 is configured to, when it is determined that a plurality of heating modules 50 of the electromagnetic heating apparatus work simultaneously, obtain input power of each heating module 50, and determine the type of the corresponding heating module 50 according to the input power of each heating module 50 when the input powers of the plurality of heating modules 50 are different; the power control module 20 is configured to control the output power of each heating module 50 in different power adjustment manners according to the type of each heating module 50.

As shown in fig. 2, the power control method of the electromagnetic heating apparatus includes step S1 and step S2.

Step S1: when the plurality of heating modules 50 of the electromagnetic heating equipment are determined to work simultaneously, the input power of each heating module 50 is obtained, and the type of the corresponding heating module 50 is determined according to the input power of each heating module 50 when the input powers of the plurality of heating modules 50 are different.

For example, in some embodiments, the types of heating modules 50 include a master heating module and a slave heating module. Determining the type of the corresponding heating module 50 from the input power to each heating module 50 may include: the heating module 50 with the largest input power among the plurality of heating modules 50 is obtained, and the heating module 50 with the largest input power is taken as a master heating module, and the remaining heating modules 50 among the plurality of heating modules 50 are taken as slave heating modules. The heating modules 50 are thus classified according to the difference in input power, which may be the power input by the user for each heating module 50 according to the desired cooking function. Here, the number of the slave heating modules is one or more. When only one heating module 50 of the electromagnetic heating device works, the heating module 50 can be used as a main heating module or a slave heating module to perform output power control in a corresponding power regulation mode.

In one specific embodiment according to the present invention, as shown in fig. 3, the type of the corresponding heating module 50 is determined in step S1 according to the input power of each heating module 50, including step S11 and step S12, as follows:

step S11: it is determined whether the input power to any one of the heating modules 50 has changed. If not, the type of the heating module 50 does not need to be judged and the output power does not need to be controlled, the method is exited, and the output power of the current heating module 50 is kept; if yes, go to step S12.

Step S12: the heating module 50 with the largest input power among the plurality of heating modules 50 is obtained, and this heating module 50 is taken as the master heating module, and the remaining heating modules 50 among the plurality of heating modules 50 are taken as the slave heating modules.

Thereby, the type of the heating module 50 is determined.

As shown in fig. 2, step S2: the output power of the corresponding heating module 50 is controlled in different power adjustment manners according to the type of each heating module 50. So that the output power of each heating module 50 is equal to its corresponding input power.

Output power is controlled by adopting different power regulation modes for different types of heating modules 50, so that the consistency of the working frequency of a plurality of heating modules 50 which work simultaneously is facilitated, a series of synthetic frequencies generated by mixing various frequencies in the working process are avoided, sharp and harsh noise generated by synthesizing differential frequency signals is avoided, and the use experience of a user is improved.

For example, in some embodiments, step S2: the output power of the corresponding heating module 50 is controlled in different power adjusting manners, including step S21 and step S22, according to the type of each heating module 50.

Step S21: and when the current heating module 50 is determined to be the main heating module, controlling the output power of the main heating module by adopting a frequency modulation power regulation mode.

The power control device 100 of the electromagnetic heating apparatus outputs a PWM (Pulse Width Modulation) signal to control a plurality of heating modules 50, wherein the plurality of heating modules 50 are a first heating module 200, a second heating module 300, and a third heating module 50 \8230 \ 8230, and wherein as shown in fig. 4, the first heating module 200 includes a first driving module 201, a first upper bridge switching tube 202, a first lower bridge switching tube 203, a first heating coil 204, and a first pair of

resonant capacitors

205, 206; the second heating module 300 includes a second driving module 301, a second upper bridge switching tube 302, a second lower bridge switching tube 303, a second heating coil 304, and a second pair of

resonant capacitors

305, 306; \8230Apower control device 100 of the electromagnetic heating device outputs PWM signals to a driving module, the driving module outputs complementary PWM signals to control upper bridge switching tubes and lower bridge switching tubes to be alternately conducted, a heating coil is controlled to output alternating current to generate an alternating magnetic field, the alternating magnetic field enables metal cookware placed on the heating coil to induce alternating eddy current, and the alternating eddy current enables the cookware to heat so as to heat food.

The output power of the main heating module is controlled by adopting a frequency modulation power regulation mode, and the specific principle is as follows:

as shown in fig. 5, which is a relationship diagram of the PWM frequency and the output power of the main heating module, in the frequency range of the inductive region (frequency f0 to f 1), the larger the PWM frequency is, the smaller the output power is; the smaller the PWM frequency, the greater the output power.

Fig. 6 is a flow chart showing the control of the output power of the main heater module by using a frequency-modulated power regulation method. The method specifically comprises the following steps:

step S211: judging whether the input power of the main heating module is increased, if so, executing a step S212; if not, go to step S214;

step S212: reducing the PWM frequency of the main heating module, and then performing step S213;

step S213: judging whether the output power of the current main heating module is equal to the input power or not, if so, finishing the control of the output power of the main heating module, and exiting the method; if not, returning to execute S212;

step S214: increasing the PWM frequency of the main heating module, and then performing step S215;

step S215: judging whether the output power of the current main heating module is equal to the input power or not, if so, finishing the control of the output power of the main heating module, and exiting the method; if not, the process returns to step S214.

Fig. 7 shows a waveform diagram of the main heating module PWM output from power control apparatus 100. The power control device 100 outputs a PWM waveform of the main heating module as W10 waveform in fig. 7, outputs a power of 1000W (corresponding to P10 in fig. 5), and has a frequency of 25KHz (corresponding to f10 in fig. 5).

If the user adjusts the heating power to 1500W, that is, adjusts the input power of the main heater module to 1500W, steps S212 and S213 are executed until the output power of the main heater module is equal to the input power, and then the power control apparatus 100 outputs the main heater module PWM waveform as shown by W11 waveform in fig. 7, the output power is shown by P11 (1500W) in fig. 5, and the corresponding PWM frequency is shown by f11 (23 KHz) in fig. 5. It can be seen that the frequency of the PWM output from the power control device 100 is reduced from 25KHz (f 10) to 23KHz (f 11), and the output power is increased from 1000W to 1500W.

If the user adjusts the heating power to be reduced to 500W, i.e., adjusts the input power of the main heater module to be 500W, steps S214 and S215 are executed until the output power of the main heater module is equal to the input power, at which time the power control apparatus 100 outputs the PWM waveform of the main heater module as shown by W12 in fig. 7, the output power is shown by P12 (500W) in fig. 5, and the corresponding PWM frequency is shown by f12 (27 KHz) in fig. 5. It can be seen that the frequency of the PWM output from the power control device 100 is increased from 25KHz (f 10) to 27KHz (f 12), and the output power is reduced from 1000W to 500W.

The output power of the main heating module is controlled in a frequency modulation power adjusting mode, so that the output power of the main heating module is adjusted more quickly, the output power can be adjusted to be equal to the input power quickly, and the user experience is improved. And the method is favorable for obtaining larger working power and meets the requirement of a larger range for adjusting the output power.

Step S22: and when the current heating module 50 is determined to be the slave heating module, controlling the output power of the slave heating module by adopting a power regulation mode of regulating the duty ratio.

The specific principle of controlling the output power of the secondary heating module by adopting the power regulation mode of regulating the duty ratio is as follows:

FIG. 8 is a graph showing the relationship between the duty ratio and the output power of the slave heater module when the half-bridge switching tube PWM frequency of the slave heater module is equal to that of the master heater module. It can be seen that the smaller the duty cycle of the PWM, the smaller the output power; the larger the duty cycle of the PWM, the larger the output power.

As shown in fig. 9, a flowchart for controlling the output power from the heater module by the duty ratio-adjusted power adjustment method is shown. The method specifically comprises the following steps:

step S221: judging whether the input power of the heating module is increased, if so, executing step S222; if not, go to step S224;

step S222: increasing the PWM duty ratio of the slave heating module, and then performing step S223;

step S223: judging whether the output power of the current slave heating module is equal to the input power, if so, finishing the control of the output power of the slave heating module, and exiting the method; if not, returning to execute S222;

step S224: reducing the PWM duty ratio of the slave heating module, and then performing step S225;

step S225: judging whether the output power of the current slave heating module is equal to the input power, if so, finishing the control of the output power of the slave heating module, and exiting the method; if not, the process returns to step S224.

As shown in fig. 10, the power control apparatus 100 outputs PWM waveforms of the master and slave heater modules. W20 is a PWM waveform of the power control device 100 outputting the main heater module, and the duty ratio is 50%. The waveform W21 is a PWM waveform outputted from the power control device 100 to the slave heater module, and has a duty ratio of 30% (corresponding to P20 in fig. 8), and it can be seen that the PWM period (T10 in fig. 10) of the master heater module is equal to the PWM period (T20 in fig. 1) of the slave heater module, and the PWM frequency of the slave heater module is equal to the PWM frequency of the master heater module, as represented by the formula frequency f = 1/T.

If the user adjusts the heating module power from 500W to 600W, that is, adjusts the input power from the heating module to 600W, the power control device 100 outputs the waveform from the heating module PWM as W22 in FIG. 10 after executing steps S222 and S223 until the output power from the heating module becomes equal to the input power, at which time the high level time from the heating module PWM increases from t21 to t22 in FIG. 10, the corresponding duty ratio increases from 30% to 40% in FIG. 8, and the output power increases from 500W to 600W is realized.

If the user adjusts the reduction of the heat power from 500W to 400W, that is, adjusts the input power from the heater module to 400W, the power control device 100 executes steps S224 and S225 until the output power from the heater module is equal to the input power, and then outputs the waveform from the heater module PWM as W23 in FIG. 10, when the high time from the heater module PWM is reduced from t21 to t23 in FIG. 10, and the corresponding duty ratio is reduced from 30% to 30% in FIG. 8, thereby achieving the reduction of the output power from 500W to 400W.

The output power of the slave heating module is controlled by adopting a power regulation mode of regulating the duty ratio, so that the PWM frequency of the slave heating module is not changed in the power regulation process, the consistency of the PWM frequencies of the master heating module and the slave heating module and the consistency of the PWM frequencies of a plurality of slave heating modules are facilitated, and no matter how the output power of the master heating module and the output power of the slave heating module are changed, the PWM frequency of the master heating module and the PWM frequency of the slave heating module output by the power control device 100 are kept the same, namely the frequency difference of all output PWM is kept to be zero. Because the difference frequency signal is zero, sharp and harsh noise can not be generated, and the user experience effect is effectively improved.

According to the power control method of the electromagnetic heating device in the embodiment of the first aspect of the present invention, the output power is controlled by adopting different power adjustment modes for different types of heating modules 50, which is beneficial to achieving the frequency consistency of the plurality of heating modules 50 which work simultaneously, so as to avoid the generation of a synthesized frequency due to the mixing of multiple frequencies in the working process, avoid the generation of sharp and harsh noise due to the synthesis of difference frequency signals, and facilitate the improvement of the user experience.

According to the power control device 100 of the electromagnetic heating apparatus in the embodiment of the second aspect of the present invention, the output power is controlled by adopting different power adjustment modes for different types of heating modules 50, which is beneficial to achieving the frequency consistency of the plurality of heating modules 50 that work simultaneously, so as to avoid the generation of a synthesized frequency due to the mixing of multiple frequencies during the working process, avoid the generation of sharp and harsh noise due to the synthesis of difference frequency signals, and facilitate the improvement of the user experience.

In the embodiment of the second aspect of the present invention, a method for determining the type of the corresponding heating module 50 by the determination module 10 and a method for controlling the output power of the corresponding heating module 50 by the power control module 20 in different power adjustment manners may refer to the power control method of the electromagnetic heating apparatus in the embodiment of the first aspect of the present invention, and are not described herein again.

According to some embodiments of the invention, step S21: the method for controlling the output power of the main heating module by adopting a frequency modulation power regulation mode comprises the following steps: the first PWM signal with a fixed duty ratio is output to the main heating module, and the output power of the main heating module is controlled by adjusting the frequency of the first PWM signal. As shown in fig. 5, when the duty ratio of the first PWM signal is constant, the output power is smaller as the frequency is larger, and the output power is larger as the frequency is smaller. The output power of the main heating module is adjusted by fixing the duty ratio of the first PWM signal and only adjusting the frequency of the first PWM signal, so that the power adjustment is quicker, and the power adjustment method is simplified.

Further, step S22: the method for controlling the output power of the secondary heating module by adopting the power regulation mode of regulating the duty ratio comprises the following steps: and outputting a second PWM signal with a fixed frequency to the slave heating module, and controlling the output power of the slave heating module by adjusting the duty ratio of the second PWM signal. As shown in fig. 8, when the frequency of the second PWM signal is constant, the output power increases as the duty ratio increases, and the output power decreases as the duty ratio decreases. The frequency of the second PWM signal is fixed, and the output power of the slave heating modules is adjusted by only adjusting the duty ratio of the second PWM signal, so that the frequencies of the slave heating modules are always equal, and the generation of difference frequency signals is effectively reduced.

Also, in some embodiments, the frequency of the second PWM signal is the same as the frequency of the first PWM signal. In other words, the frequencies of the master heating module and the slave heating module are always equal, so that the generation of difference frequency signals is effectively avoided. For example, in some embodiments, after the frequency of the first PWM signal is adjusted until the output power of the master heating module is equal to the input power, the frequency of the second PWM signal is controlled to be equal to the frequency of the adjusted first PWM signal, and then the duty ratio of the second PWM signal is adjusted until the output power of the slave heating module is equal to the input power, so as to achieve the frequency consistency of the master heating module and the slave heating module. In addition, in the embodiment that the number of the slave heating modules is multiple, the output powers of the slave heating modules can be independently controlled without mutual interference, the frequency consistency can be well kept, and the power adjusting method is simpler.

In some embodiments, the fixed duty ratio of the first PWM signal is 50%, and the duty ratio of the second PWM signal is adjustable from 0 to 50%, so that the output power of the slave heating module is adjusted within a range less than or equal to the output power of the master heating module. For example, in some embodiments, the duty cycle of the second PWM signal may be adjusted to 0, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, and so on. When the duty ratio of the second PWM signal is 0, stopping heating from the heating module; when the duty ratio of the second PWM signal is 50%, the output power of the slave heating module is equal to the output power of the master heating module.

When two or more heating modules 50 having the largest input power are selected from the plurality of heating modules 50, one of the heating modules 50 having the largest input power may be used as a master heating module, and the remaining heating modules 50 may be used as slave heating modules; alternatively, all the heater modules 50 having the maximum input power and the same input power may be used as the master heater modules, and the other heater modules 50 except for some of the master heater modules may be used as the slave heater modules, and the first PWM signals having the same fixed duty ratio may be input to the several master heater modules.

According to some embodiments of the present invention, when it is determined that only one heating module 50 of the electromagnetic heating device is in operation, the output power of the heating module 50 is controlled by using a frequency-modulated power adjustment method, so that the output power of the heating module 50 is controlled more quickly, and a wider range or higher output power can be output to meet the cooking requirement.

For example, in one embodiment, when it is determined that the electromagnetic heating apparatus has only one heating module 50 to operate, the heating module 50 is controlled to input a first PWM signal with a fixed duty ratio of 50%, and the output power of the heating module 50 is controlled by adjusting the frequency of the first PWM signal.

A power control method of an electromagnetic heating apparatus according to an embodiment of the third aspect of the present invention and a power control device 100 of an electromagnetic heating apparatus according to an embodiment of the fourth aspect of the present invention are described below with reference to fig. 11 to 15.

The applicant finds that when the duty ratio of the heating module 50 is smaller than a certain value, the half-bridge upper bridge switchable tube can enter a hard switching state from a soft switching state, the loss of the switching tube is increased, the temperature is increased, the switching tube can be damaged, and the reliability of the electromagnetic heating device is reduced. Based on this, the present invention further provides a power control method and a power control apparatus 100 capable of preventing the switch tube from entering the hard on state.

As shown in fig. 11, a power control apparatus 100 of an electromagnetic heating device according to a fourth aspect of the present invention may include: a first determination module 30, a power control module 20, and a second determination module 40.

The first determining module 30 is configured to determine a slave heating module of the plurality of heating modules 50 when the plurality of heating modules 50 of the electromagnetic heating apparatus are simultaneously operated, and functions as the determining module 10 of the power control apparatus 100 according to the embodiment of the second aspect of the present invention. The power control module 20 is configured to control the output power from the heating module in a duty-adjusted power adjustment manner. The second determining module 40 is configured to determine whether an upper bridge switching tube of the slave heating module operates in a hard on state when the power control module 20 controls the output power of the slave heating module in a duty-adjusted power adjusting manner. In addition, the power control module 20 is further configured to control the upper bridge switching tube of the slave heating module in a wave-loss heating control manner when the upper bridge switching tube is in a hard on state.

As shown in fig. 12, the power control method of the electromagnetic heating apparatus according to the embodiment of the third aspect of the present invention may include steps S3, S4, and S5. The method comprises the following specific steps:

and step S3: when the plurality of heating modules 50 of the electromagnetic heating apparatus are simultaneously operated, the slave heating module among the plurality of heating modules 50 is determined.

Among them, the heater module having the non-maximum power may be input from among the plurality of heater modules 50, or in other words, the heater module having the relatively small power may be input from among the plurality of heater modules 50. For example, the method for determining the slave heating modules in the plurality of heating modules 50 may refer to the power control method of the electromagnetic heating apparatus according to the embodiment of the first aspect of the present invention, and all the contents of the power control method according to the embodiment of the first aspect of the present invention may be applied to the power control method of the electromagnetic heating apparatus according to the embodiment of the third aspect of the present invention, and the specific contents and advantageous effects thereof are not described herein again.

And step S4: and controlling the output power of the slave heating module by adopting a power regulation mode of regulating the duty ratio, and determining whether an upper bridge switching tube of the slave heating module works in a hard switching-on state or not.

The switch tube has small loss and low temperature rise in a soft switching-on state, and is an ideal working state. The switch tube has large loss and high temperature when in a hard switching-on state. In general, when the duty ratio of the PWM signal is greater than a certain value, the upper bridge switching transistor and the lower bridge switching transistor operate in a soft on state. However, when the duty ratio is smaller than a certain value, the upper bridge switching tube enters a hard switching-on state from a soft switching-on state. Therefore, whether the upper bridge switching tube of the secondary heating module works in a hard switching-on state or not is determined, and control is performed according to the hard switching-on state, so that the problems that the upper bridge switching tube is too large in loss and too high in temperature rise are avoided.

For example, in some embodiments, step S4: determining whether the upper bridge switching tube of the slave heating module works in a hard on state may include steps S41 and S42, which are as follows:

step S41: and judging whether the duty ratio of the PWM signal of the upper bridge switching tube is smaller than a preset value.

Step S42: and if the duty ratio of the PWM signal of the upper bridge switching tube is smaller than a preset value, determining that the upper bridge switching tube works in a hard switching-on state.

Here, the preset value may be flexibly set according to actual situations, for example, in some specific embodiments, the preset value may be 30%, and if the duty ratio of the PWM signal of the upper bridge switching tube is 20% and 20% is less than 30%, it is determined that the upper bridge switch operates in a hard on state.

For another example, in some embodiments, step S4: determining whether the upper bridge switching tube of the heating module works in a hard on state or not may include steps S43, S44 and S45, which are as follows:

step S43: detecting a midpoint voltage between an upper bridge switching tube and a lower bridge switching tube of the secondary heating module;

step S44: determining whether the voltage difference between the collector and the emitter of the upper bridge switching tube is greater than a preset voltage threshold value or not according to the midpoint voltage;

step S45: and when the voltage difference between the collector and the emitter of the upper bridge switching tube is greater than a preset voltage threshold value, determining that the upper bridge switching tube works in a hard switching-on state.

Here, the preset voltage threshold may be set according to actual conditions, for example, the preset voltage threshold may be 0V. When the switch tube is turned on, if the voltage difference between the collector and the emitter of the switch tube is less than or equal to 0V, the switch tube is called a soft on state. Conversely, if the collector-emitter voltage difference of the switch tube is greater than 0V, it is called a hard on state.

The power control device 100 of the electromagnetic heating equipment outputs PWM signals to control a plurality of heating modules 50, wherein the plurality of heating modules 50 are respectively a first heating module 200, a second heating module 300 \8230 \, the electromagnetic heating equipment further comprises a first half-bridge midpoint voltage detection module 207, a second half-bridge midpoint voltage detection module 307 \8230and \8230, and the first half-bridge midpoint voltage detection module 207, the second half-bridge midpoint voltage detection module 307 \8230andthe \8230arearranged in one-to-one correspondence with the plurality of heating modules 50

As shown in fig. 13, the first heating module 200 includes a first driving module 201, a first upper bridge switching tube 202, a first lower bridge switching tube 203, a first heating coil 204, and a first pair of

resonant capacitors

205 and 206, and the first half-bridge midpoint voltage detecting module 207 is configured to detect whether the first upper bridge switching tube 202 operates in a hard on state or a soft on state; the second heating module 300 includes a second driving module 301, a second upper bridge switching tube 302, a second lower bridge switching tube 303, a second heating coil 304, and a second

resonant capacitor pair

305, 306, and the second half-bridge midpoint voltage detecting module 307 is configured to detect whether the second upper bridge switching tube 302 operates in a hard on state or a soft on state; \8230 \ 8230

The second heater module 300 will be described as an example of the slave heater module.

Fig. 14 is a waveform diagram showing the operation of the second heating module 300. W10 is the gate (g 1) driving waveform of the second upper bridge switching tube 302, W11 is the gate (g 2) driving waveform of the second lower bridge switching tube 303, and W12 is the second half-bridge midpoint (g 3) voltage waveform.

At the time t11, at the time when the duty ratio of the PWM signal is large, the second upper bridge switching tube 302 is turned on, the second half-bridge midpoint voltage detection module 307 acquires a midpoint voltage signal and sends the midpoint voltage signal to the power control device 100, the power control device 100 detects that the voltage of the second half-bridge midpoint voltage (g 3) is a high level 310V and is equal to the supply voltage (VC 2), the voltage difference between the collector and the emitter of the second upper bridge switching tube 302 is equal to 0V, and the power control device 100 determines that the second upper bridge switching tube 302 operates in the soft-on state. At the time t12, at the time when the duty ratio of the PWM signal is large, the power control device 100 detects that the voltage of the second half-bridge midpoint voltage (g 3) is 0V, which is a low level and is equal to the ground voltage, when the voltage difference between the collector and the emitter of the second lower bridge switching tube 303 is equal to 0V, and the power control device 100 determines that the second lower bridge switching tube 303 operates in the soft-on state. Under the condition, the loss of the switching tube is small, and the system works stably.

However, when the PWM duty ratio of the second heating module 300 is smaller than a certain value, the half-bridge upper switch tube enters a hard on state from a soft on state. With continued reference to fig. 14, at time t21, at the second upper bridge switching tube 302 conduction time when the duty ratio of the PWM signal is small, the power control device 100 detects that the voltage of the second half-bridge midpoint voltage (g 3) is at the low level 0V, the supply voltage VC2 is 310V, the voltage difference between the collector and the emitter of the second upper bridge switching tube 302 is equal to 310V, and the power control device 100 determines that the second upper bridge switching tube 302 is in the hard-on state. In this case, the second upper bridge switching tube 302 has large loss and high temperature, which may cause damage to the second upper bridge switching tube 302.

According to some embodiments of the present invention, before determining whether the upper bridge switching tube of the heating module is operated in the hard on state in step S4, the method may further include the following steps: and determining to adopt a continuous heating control mode to control the slave heating module. The continuous heating control mode refers to that PWM output is started in a time period between each zero crossing point of an input alternating current power supply, and the slave heating module works. When the upper bridge switching tube of the secondary heating module works in a soft switching-on state, the output power is controlled by adopting a continuous heating control mode.

As shown in fig. 12, step S5: and if the upper bridge switching tube of the secondary heating module works in a hard switching-on state, controlling the upper bridge switching tube by adopting a wave-dropping heating control mode.

The lost wave heating control method is to control the input of the PWM signal to the slave heater module to stop the heating of the heater module 50 for a certain period of time, thereby reducing the output power of the slave heater module. During the period of turning off the PWM signal input from the heating module, the switching tube does not work, and switching loss is not generated, so that the temperature rise of the switching tube is reduced, and the service life and the reliability of a product are improved.

For example, in some embodiments, the step S5 of controlling the upper bridge switching tube by using a wave-dropping heating control manner may include steps S51 to S54:

step S51: counting zero crossing points of an input alternating current power supply of the electromagnetic heating equipment;

step S52: determining whether the zero crossing point count value is greater than a preset wave-dropping threshold value;

step S53: when the zero crossing point count value is larger than the preset wave-losing threshold value, outputting a PWM signal to an upper bridge switching tube so as to heat the slave heating module;

step S54: and when the zero crossing point count value is less than or equal to the preset wave-dropping threshold value, closing the output PWM signal to the upper bridge switching tube so as to stop the heating work of the secondary heating module.

The zero-crossing detection module 101 may generate a zero-crossing signal when the ac power source is at a zero-crossing point, and input the zero-crossing signal to the power control apparatus 100, and the power control apparatus 100 counts the zero-crossing point after detecting the zero-crossing signal, for example, the power control apparatus 100 may include a zero-crossing counter, and the zero-crossing counter counts the zero-crossing point according to the zero-crossing signal, so that the power control apparatus 100 controls whether to output a PWM signal from the heating module before the next zero-crossing signal arrives for heating. The preset wave-dropping threshold value is the number of wave-dropping, and can be set according to the output power, wherein the larger the number of wave-dropping is, the smaller the output power is, the smaller the number of wave-dropping is, and the larger the output power is. Therefore, control of different output powers can be realized by adjusting the preset wave-dropping threshold value.

Fig. 15 is a waveform diagram showing operation according to the continuous heating control method and the wave-dropping heating control method. Wherein, the W20 waveform is a voltage waveform of half-bridge power supply (VC 1, VC 2), and Z10, Z11, Z12 and the like are marks of zero crossing points of an input alternating current power supply of the electromagnetic heating equipment. The Z10-Z16 time period of the W21 waveform corresponds to a continuous heating control mode; and in the time periods of Z16-Z17, Z18-Z19, Z110-Z111 and Z112-Z113, the output PWM signal is closed to the upper bridge switching tube, the secondary heating module does not work, and the time periods of Z16-Z1114 correspond to the wave-dropping heating control method.

Taking the W21 waveform as an example, the number of lost waves is 1, and the preset lost wave threshold value is 1. Before t31, the slave heating module is controlled to work in a continuous heating control mode. At time t31, the power control device 100 detects that the upper bridge switching tube is in a hard on state, switches to a wave-dropping heating control mode, and clears the zero-crossing counter to zero, so that the zero-crossing count value (CNT) is zero. At the time of the zero-crossing point Z16, the power control apparatus 100 executes the method shown in fig. 16, after the zero-crossing counter performs the operation of adding 1, the value of CNT is 1, and since the value of CNT is not greater than the preset wave-dropping threshold value, the output PWM signal is turned off to the upper bridge switching tube, so that the heating module does not perform the heating operation in the time period Z16 to Z17. At the time Z17 of the downward zero-crossing point, the power control apparatus 100 executes the method shown in fig. 16, the zero-crossing counter performs the operation of adding 1, the value of CNT is 2, since the value of CNT is greater than the preset wave-dropping threshold value, the zero-crossing counter is cleared (CNT = 0), and the PWM signal is output to the upper bridge switching tube, so that the heating operation is performed from the heating module in the time period Z17 to Z18.

In the embodiment where the number of the wave loss is 2 and the preset wave loss threshold is 2, the working process of the W22 waveform can be understood according to the working process of the W21 waveform, and details are not described herein.

According to the power control method of the electromagnetic heating device in the embodiment of the third aspect of the invention, the upper bridge switching tube of the secondary heating module is controlled by adopting a wave-loss heating control mode when the upper bridge switching tube works in a hard switching-on state, and the upper bridge switching tube does not work within a period of time, so that the switching loss is not generated, the temperature rise of the upper bridge switching tube is reduced, and the service life and the reliability of the electromagnetic heating device are improved.

According to the power control device 100 of the electromagnetic heating apparatus in the fourth aspect of the present invention, when the upper bridge switching tube of the heating module is in a hard on state, the upper bridge switching tube is controlled by adopting a wave-dropping heating control manner, and the upper bridge switching tube does not work for a period of time, so that no switching loss is generated, thereby reducing the temperature rise of the upper bridge switching tube, and improving the service life and reliability of the electromagnetic heating apparatus.

In the embodiment of the fourth aspect of the present invention, reference may be made to the power control method of the electromagnetic heating apparatus in the embodiment of the third aspect of the present invention for the method for determining the slave heating module by the first determining module 30, the method for controlling the output power of the slave heating module by the power control module 20 in the duty-adjusted power adjustment manner, the method for determining whether the upper bridge switch of the slave heating module operates in the hard-on state by the second determining module 40, and the method for controlling the upper bridge switch tube by the power control module 20 in the lost-wave heating control manner, which are not described herein again.

According to a fifth aspect of the present invention, there is provided a computer readable storage medium, on which a power control program of an electromagnetic heating apparatus is stored, the power control program of the electromagnetic heating apparatus implementing a power control method of the electromagnetic heating apparatus according to the first aspect of the present invention or implementing a power control method of the electromagnetic heating apparatus according to the third aspect of the present invention when executed by a processor.

Since the power control method of the electromagnetic heating device according to the first aspect of the present invention has the above-mentioned beneficial technical effects, according to the computer-readable storage medium of the fifth aspect of the present invention, when the stored power control program is executed by the processor, the power control method described in the above-mentioned embodiment is implemented, and the output power is controlled by adopting different power adjustment modes for different types of heating modules 50, which is beneficial to implementing the frequency consistency of multiple heating modules 50 that work simultaneously, so as to avoid that multiple frequencies are mixed together to generate a synthesized frequency in the working process, avoid that a synthesized difference frequency signal generates sharp and harsh noise, and facilitate improving the user experience.

Since the power control method for the electromagnetic heating device according to the embodiment of the third aspect of the present invention has the above-mentioned beneficial technical effects, according to the computer-readable storage medium of the fifth aspect of the present invention, when the stored power control program is executed by the processor, the power control method described in the above-mentioned embodiment is implemented, and by controlling the upper bridge switching tube of the heating module by adopting a wave-dropping heating control manner when the upper bridge switching tube is operated in a hard on state, the upper bridge switching tube does not operate for a period of time, and no switching loss is generated, so that the temperature rise of the upper bridge switching tube is reduced, and the service life and reliability of the electromagnetic heating device are improved.

An electromagnetic heating apparatus according to an embodiment of the sixth aspect of the present invention includes a memory, a processor, and a power control program of the electromagnetic heating apparatus stored on the memory and executable on the processor, and when the processor executes the power control program, the processor implements the power control method of the electromagnetic heating apparatus according to the embodiment of the first aspect of the present invention, or implements the power control method of the electromagnetic heating apparatus according to the embodiment of the third aspect of the present invention.

Since the power control method for the electromagnetic heating device according to the embodiment of the first aspect of the present invention has the above-mentioned beneficial technical effects, according to the electromagnetic heating device according to the embodiment of the sixth aspect of the present invention, the output power is controlled by adopting different power adjustment modes for different types of heating modules 50, which is beneficial to achieving the frequency consistency of the plurality of heating modules 50 that operate simultaneously, thereby avoiding that multiple frequencies are mixed together to generate a synthesized frequency in the operating process, avoiding that a difference frequency signal is synthesized to generate sharp and harsh noise, and being beneficial to improving the use experience of a user.

Because the power control method of the electromagnetic heating device according to the embodiment of the third aspect of the present invention has the above beneficial technical effects, according to the electromagnetic heating device according to the embodiment of the sixth aspect of the present invention, when the upper bridge switching tube of the secondary heating module works in a hard on state, the upper bridge switching tube is controlled by adopting a wave-dropping heating control manner, and the upper bridge switching tube does not work within a period of time, so that no switching loss is generated, thereby reducing the temperature rise of the upper bridge switching tube, and improving the service life and reliability of the electromagnetic heating device.

Other constructions and operations of electromagnetic heating apparatuses according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to 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.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

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 steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention 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, various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. 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 addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer-readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. 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.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

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

1. A power control method of an electromagnetic heating device is characterized by comprising the following steps:

when the plurality of heating modules of the electromagnetic heating equipment are determined to work simultaneously, the input power of each heating module is obtained, and the type of the corresponding heating module is determined according to the input power of each heating module when the input powers of the plurality of heating modules are different;

controlling the output power of the corresponding heating module by adopting different power regulation modes according to the type of each heating module;

the types of the heating modules comprise a main heating module and a slave heating module, wherein the type of the corresponding heating module is determined according to the input power of each heating module, and the method comprises the following steps: obtaining a heating module with the largest input power in the plurality of heating modules, taking the heating module with the largest input power as a main heating module, and taking the rest heating modules in the plurality of heating modules as slave heating modules;

wherein, according to the type of each heating module, adopt different power regulation modes to control the output power of corresponding heating module, include:

when the current heating module is determined to be a main heating module, controlling the output power of the main heating module by adopting a frequency modulation power regulation mode;

and when the current heating module is determined to be the slave heating module, controlling the output power of the slave heating module by adopting a power regulation mode of regulating the duty ratio.

2. A power control method for an electromagnetic heating apparatus according to claim 1, wherein the controlling the output power of the main heating module by using a frequency-modulated power regulation method comprises:

outputting a first PWM signal with a fixed duty ratio to the main heating module, and controlling the output power of the main heating module by adjusting the frequency of the first PWM signal.

3. A power control method for an electromagnetic heating apparatus according to claim 2, wherein the controlling the output power of the slave heating module by a duty-adjusted power adjustment method comprises:

and outputting a second PWM signal with fixed frequency to the slave heating module, and controlling the output power of the slave heating module by adjusting the duty ratio of the second PWM signal.

4. A power control method of an electromagnetic heating apparatus as claimed in claim 3, characterized in that the frequency of the second PWM signal is the same as the frequency of the first PWM signal.

5. A power control method for electromagnetic heating equipment according to claim 3, characterized in that the fixed duty cycle is 50%, and the duty cycle of the second PWM signal is adjustable from 0 to 50%.

6. A power control method for an electromagnetic heating device as claimed in any one of claims 1 to 5, characterized in that when it is determined that the electromagnetic heating device has only one heating module to operate, the output power of the heating module is controlled by means of frequency-modulated power regulation.

7. A computer-readable storage medium, characterized in that a power control program of an electromagnetic heating apparatus is stored thereon, which when executed by a processor implements the power control method of the electromagnetic heating apparatus according to any one of claims 1 to 6.

8. An electromagnetic heating apparatus, comprising a memory, a processor, and a power control program of the electromagnetic heating apparatus stored on the memory and operable on the processor, wherein the processor, when executing the power control program, implements the power control method of the electromagnetic heating apparatus according to any one of claims 1 to 6.

9. A power control apparatus of an electromagnetic heating device, comprising:

the determining module is used for acquiring the input power of each heating module when the plurality of heating modules of the electromagnetic heating equipment work at the same time, and determining the type of the corresponding heating module according to the input power of each heating module when the input powers of the plurality of heating modules are different;

the power control module is used for controlling the output power of the corresponding heating module by adopting different power regulation modes according to the type of each heating module;

the types of the heating modules comprise a main heating module and a slave heating module, wherein the determining module is used for acquiring the heating module with the largest input power in the plurality of heating modules, taking the heating module with the largest input power as the main heating module, and taking the rest heating modules in the plurality of heating modules as the slave heating modules;

the power control module is used for controlling the output power of the main heating module by adopting a frequency modulation power regulation mode when the current heating module is determined to be the main heating module, and controlling the output power of the slave heating module by adopting a duty ratio modulation power regulation mode when the current heating module is determined to be the slave heating module.