CN112930000B - Electromagnetic heating frequency conversion method and system and electromagnetic heater - Google Patents
Electromagnetic heating frequency conversion method and system and electromagnetic heater Download PDFInfo
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- CN112930000B CN112930000B CN202110315568.2A CN202110315568A CN112930000B CN 112930000 B CN112930000 B CN 112930000B CN 202110315568 A CN202110315568 A CN 202110315568A CN 112930000 B CN112930000 B CN 112930000B
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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
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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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Abstract
The invention relates to an electromagnetic heating frequency conversion method, which comprises the following steps: setting working parameters of the electromagnetic heater, wherein the working parameters comprise: an output frequency range and a phase difference range; acquiring a phase difference value between a current phase and a voltage phase of a load end; adjusting the output frequency of the electromagnetic heater according to the phase difference value and the phase difference range to obtain a first output frequency; determining an operating frequency according to the first output frequency and the output frequency range; and outputting the working frequency to a load. According to the electromagnetic heating frequency conversion method, the output frequency of the electromagnetic heater is quickly and accurately adjusted by setting the reasonable phase difference range and the reasonable output frequency range, so that the proper working frequency can be quickly determined, and even if the load changes, the working frequency suitable for the current load can be quickly adjusted according to the change of the load by the electromagnetic heating frequency conversion method.
Description
Technical Field
The invention relates to the field of electromagnetic heating, in particular to an electromagnetic heating frequency conversion method, an electromagnetic heating frequency conversion system and an electromagnetic heater.
Background
The principle of electromagnetic heating is that an alternating magnetic field is generated by the components of an electronic circuit board, when a ferrous container is placed on the iron-containing container, the surface of the container cuts alternating magnetic lines of force to generate alternating current (eddy current) on the metal part at the bottom of the container, the eddy current enables iron atoms at the bottom of the container to move randomly at a high speed, and the atoms collide and rub with each other to generate heat energy. Thereby achieving the effect of heating the article. Since the iron vessel itself generates heat, the overall heat conversion is particularly high, up to 95%. At present, electromagnetic heating technologies are adopted for electromagnetic ovens and electromagnetic stoves.
The conventional electromagnetic heater is divided into a fixed frequency mode and a variable frequency mode. The traditional electromagnetic heater has the problem of low frequency regulation speed in a frequency conversion mode, cannot adapt to load change quickly, and often needs electromagnetic heating for a period of time before the proper working frequency can be determined.
Disclosure of Invention
Therefore, it is necessary to provide an electromagnetic heating frequency conversion method, an electromagnetic heating frequency conversion system, and an electromagnetic heater, aiming at the problem that the conventional electromagnetic heater cannot adjust the output frequency quickly to adapt to the load change.
An electromagnetic heating frequency conversion method comprises the following steps: setting working parameters of the electromagnetic heater, wherein the working parameters comprise: an output frequency range and a phase difference range; acquiring a phase difference value between a current phase and a voltage phase of a load end; adjusting the output frequency of the electromagnetic heater according to the phase difference value and the phase difference range to obtain a first output frequency; determining an operating frequency according to the first output frequency and the output frequency range; and outputting the working frequency to a load.
The electromagnetic heating frequency conversion method can quickly and accurately determine the working frequency of the electromagnetic heater, and output the working frequency to the load for heating, so that the frequency regulation speed of the electromagnetic heater is increased.
In one embodiment, the output frequency range includes an output frequency upper limit value and an output frequency lower limit value, and the phase difference range includes a phase difference lower limit value and a phase difference upper limit value; the output frequency upper limit value is greater than or equal to the output frequency lower limit value, and the phase difference upper limit value is greater than or equal to the phase difference lower limit value.
In one embodiment, the obtaining a phase difference value between a current phase and a voltage phase at the load end includes: acquiring a voltage phase value and a current phase value of the load end; inputting the voltage phase value and the current phase value into a phase difference timer, and calculating to obtain a time difference between the voltage phase and the current phase; and obtaining the phase difference value according to the time difference.
In one embodiment, the step of adjusting the output frequency according to the phase difference value and the phase difference range to obtain a first output frequency includes: comparing the phase difference value with the phase difference range, and increasing the output frequency by a preset frequency value when the phase difference value is larger than the phase difference upper limit value to obtain the first output frequency; when the phase difference value is smaller than the phase difference lower limit value, reducing the output frequency by the preset frequency value to obtain the first output frequency; and when the phase difference value is greater than or equal to the phase difference lower limit value and less than or equal to the phase difference upper limit value, taking the output frequency as the first output frequency.
In one embodiment, the step of determining the operating frequency based on the first output frequency and the output frequency range comprises: when the first output frequency is greater than the upper limit value of the output frequency, taking the lower limit value of the output frequency as the working frequency; when the first output frequency is smaller than the lower limit value of the output frequency, taking the upper limit value of the output frequency as the working frequency; and when the first output frequency is smaller than or equal to the upper limit value of the output frequency and is greater than or equal to the lower limit value of the output frequency, taking the first output frequency as the working frequency.
An electromagnetic heating frequency conversion system comprising: the parameter setting device is used for setting working parameters, and the working parameters comprise an output frequency range and a phase difference range; the detection device is connected with the load end and used for acquiring the phase difference value of the current and the voltage of the load end; the first comparison device is connected with the detection device and the parameter setting device and is used for comparing the phase difference value with the phase difference range; the frequency adjusting device is connected with the first comparing device and used for adjusting the output frequency according to the comparison result of the phase difference value and the phase difference range to obtain a first output frequency; the second comparison device is connected with the frequency modulation device and the parameter setting device and is used for comparing the first output frequency with the output frequency range and determining the working frequency; and the output device is connected with the second comparison device and the load end and is used for outputting the working frequency to the load end.
In one embodiment, the output frequency range comprises an output frequency upper limit value and an output frequency lower limit value, and the phase difference range comprises a phase difference lower limit value and a phase difference upper limit value; the output frequency upper limit value is greater than or equal to the output frequency lower limit value, and the phase difference upper limit value is greater than or equal to the phase difference lower limit value.
In one embodiment, the frequency adjustment device is configured to: when the phase difference value is larger than the phase difference upper limit value, increasing a preset frequency value to the output frequency to obtain a first output frequency; when the phase difference value is smaller than the phase difference lower limit value, reducing the output frequency by the preset frequency value to obtain the first output frequency; and when the phase difference value is greater than or equal to the phase difference lower limit value and less than or equal to the phase difference upper limit value, taking the output frequency as the first output frequency.
In one embodiment, the second comparing device is configured to: when the first output frequency is greater than the upper limit value of the output frequency, taking the lower limit value of the output frequency as the working frequency; when the first output frequency is smaller than the lower limit value of the output frequency, taking the upper limit value of the output frequency as the working frequency; and when the first output frequency is less than or equal to the upper limit value of the output frequency and greater than or equal to the lower limit value of the output frequency, taking the first output frequency as the working frequency.
An electromagnetic heating machine comprises the electromagnetic heating frequency conversion system in any one of the above embodiments.
The electromagnetic heating frequency conversion system can rapidly and accurately determine the working frequency according to the preset output frequency range and the phase difference range, improve the frequency conversion speed and respond to the change of the load more quickly.
Drawings
Fig. 1 is a schematic flow chart of an electromagnetic heating frequency conversion method in an embodiment.
Fig. 2 is a flowchart of a method for obtaining a phase difference between a current phase and a voltage phase at a load end according to an embodiment.
FIG. 3 is a flowchart illustrating a method for obtaining a first output frequency according to an embodiment.
FIG. 4 is a flow diagram of a method for determining an operating frequency based on a first output frequency and an output frequency range, according to an embodiment.
Fig. 5 is a block diagram of an electromagnetic heating frequency conversion system in an embodiment.
The reference numbers indicate: 100. an electromagnetic heating frequency conversion system; 110. a parameter setting device; 120. a detection device; 130. a first comparing means; 140. a frequency adjustment device; 150. a second comparing means; 160. and an output device.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In describing positional relationships, unless otherwise specified, when an element such as a layer, film or substrate is referred to as being "on" another layer, it can be directly on the other layer or intervening layers may also be present. Further, when a layer is referred to as being "under" another layer, it can be directly under, or one or more intervening layers may also be present. It will also be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present.
Where the terms "comprising," "having," and "including" are used herein, another component may be added unless a specific limiting term is used, such as "only," "consisting of 8230; \8230composition," etc. Unless mentioned to the contrary, terms in the singular may include the plural and are not to be construed as being one in number.
An embodiment of the present application provides an electromagnetic heating frequency conversion method, as shown in fig. 1, including:
s1: setting working parameters of the electromagnetic heater, wherein the working parameters comprise: an output frequency range and a phase difference range;
s2: acquiring a phase difference value between a current phase and a voltage phase of a load end;
s3: adjusting the output frequency of the electromagnetic heater according to the phase difference value and the phase difference range to obtain a first output frequency;
s4: determining an operating frequency according to the first output frequency and the output frequency range;
s5: and outputting the working frequency to a load.
Step S1 sets the operating parameters of the electromagnetic heater. The operating parameters may include a phase difference range, an output frequency range, and an initial operating frequency. The phase difference range can be used for comparing with the actually obtained phase difference value, and the comparison result can be used as the basis for adjusting the output frequency; the output frequency range can be used for evaluating the adjusted output frequency so as to avoid the damage to the electromagnetic heater caused by the overlarge or undersize adjusted output frequency. The initial operating frequency may be used as a starting frequency for the electromagnetic heater.
In step S2, a current phase collecting circuit and a voltage phase collecting circuit may be disposed at the load end to collect the current phase and the voltage phase of the load end, respectively. And then converting the acquired current phase and voltage phase into square wave signals so as to calculate the phase difference and obtain the phase difference value.
In step S3, the output frequency is adjusted according to the comparison result by comparing the phase difference value with the phase difference range. The regulating value of the output frequency can be set according to actual conditions. For example, if the phase difference value falls outside the phase difference range and has a large difference from the upper and lower limits of the phase difference range, the output frequency can be adjusted to a large extent. If the phase difference value is close to the preset phase difference range, the output frequency is finely adjusted, so that excessive adjustment is avoided. The final goal is that when the phase difference value falls within the preset phase difference range, the current output frequency can be regarded as the first output frequency.
And step S4, mainly judging the first output frequency determined in the previous step to determine whether the first output frequency falls into a reasonable working frequency range or a target working frequency range of the electromagnetic heater. If the first output frequency falls within the preset output frequency range, the first output frequency can be output as the final working frequency. And if the first output frequency does not fall into the preset output frequency range, selecting a specific frequency value from the output frequency range as the working frequency for outputting.
According to the electromagnetic heating frequency conversion method, the output frequency of the electromagnetic heater is quickly and accurately adjusted by setting the reasonable phase difference range and the reasonable output frequency range, so that the proper working frequency can be quickly determined, and even if the load changes, the working frequency suitable for the current load can be quickly adjusted according to the change of the load by the electromagnetic heating frequency conversion method.
In one example, the output frequency range includes an output frequency upper limit value and an output frequency lower limit value, and the phase difference range includes a phase difference lower limit value and a phase difference upper limit value; the output frequency upper limit value is greater than or equal to the output frequency lower limit value, and the phase difference upper limit value is greater than or equal to the phase difference lower limit value.
In one example, as shown in fig. 2, the step of obtaining the phase difference value between the current phase and the voltage phase at the load end includes:
s21: acquiring a voltage phase value and a current phase value of the load end;
s22: inputting the voltage phase value and the current phase value into a phase difference timer, and calculating to obtain a time difference between the voltage phase and the current phase;
s23: and obtaining the phase difference value according to the time difference.
The method for acquiring the voltage phase value and the current phase value of the load end may be to provide a current phase sampling circuit and a voltage phase sampling circuit at the load end, and respectively perform phase signal acquisition on the current and the voltage at the load end. Optionally, the collected current phase signal and voltage signal may be converted into a square wave signal by a current/voltage phase capturing device, and then provided to a phase difference timer, so as to calculate a time difference between the voltage phase and the current phase. As an example, a statistical method may be used to calculate an effective value of the phase difference from the time difference as the phase difference value. For example, the correspondence between the phase difference value and the time difference may be established by acquiring a plurality of current phase signals and voltage phase signals corresponding to each other, calculating the time difference thereof: the time difference Δ T1 corresponds to the phase difference Δ X1, the time difference Δ T2 corresponds to the phase difference Δ X2, and so on. And after the phase difference timer obtains the time difference, the accurate phase difference value can be obtained according to the corresponding relation.
In one example, as shown in fig. 3, adjusting the output frequency according to the phase difference value and the phase difference range to obtain a first output frequency includes:
s31: comparing the phase difference value with the phase difference range, and increasing the output frequency by a preset frequency value when the phase difference value is larger than the phase difference upper limit value to obtain the first output frequency;
s32: when the phase difference value is smaller than the phase difference lower limit value, reducing the output frequency by the preset frequency value to obtain a first output frequency;
s33: and when the phase difference value is greater than or equal to the phase difference lower limit value and less than or equal to the phase difference upper limit value, taking the output frequency as the first output frequency.
The phase difference range comprises an upper phase difference limit value and a lower phase difference limit value. When the phase difference value is greater than the phase difference upper limit value, it indicates that the difference value between the current phase and the voltage phase at the current load end is large, and exceeds the range of reasonable work of the electromagnetic heater, and the electromagnetic heater is in an inefficient working state, so that the output frequency needs to be increased by a preset frequency value to reduce the difference value between the current phase and the voltage phase. As an example, the preset frequency value may be 1 to 20, such as 1, 5, 10, 15 or 20. Optionally, the preset frequency value may be selected from existing preset frequency values according to a degree that the phase difference value exceeds the phase difference upper limit. For example, if the phase difference exceeds the upper limit of the phase difference to a large extent (the standard setting of the exceeding extent may be determined according to practical situations, and the present application is not limited), the preset frequency value may be selected to be 20, so as to perform large frequency modulation. If the phase difference value exceeds the upper limit of the phase difference to a smaller extent, the preset frequency value can be selected to be 5 or 1, so as to perform finer and more precise frequency modulation.
When the phase difference value is smaller than the phase difference lower limit value, the output frequency can be reduced by a preset frequency value to obtain a first output frequency. At this time, the phase difference lower limit value is a non-zero value, and the frequency adjustment is aimed at stabilizing the phase difference within a preset range, rather than adjusting the phase difference to zero.
And when the phase difference value is greater than or equal to the phase difference lower limit value and less than or equal to the phase difference upper limit value, taking the output frequency as the first output frequency, which indicates that the phase difference value meets the requirement, and the output frequency does not need to be adjusted in the step.
In one example, as shown in fig. 4, determining an operating frequency from the first output frequency and the output frequency range includes:
s41: when the first output frequency is larger than the upper limit value of the output frequency, taking the lower limit value of the output frequency as the working frequency;
s42: when the first output frequency is smaller than the lower limit value of the output frequency, taking the upper limit value of the output frequency as the working frequency;
s43: and when the first output frequency is smaller than or equal to the upper limit value of the output frequency and is greater than or equal to the lower limit value of the output frequency, taking the first output frequency as the working frequency.
After the output frequency is adjusted according to the phase difference value and the phase difference range to obtain the first output frequency, the first output frequency cannot be directly used as the working frequency for output, and the first output frequency needs to be further evaluated in combination with the output frequency range. The output frequency range includes an output frequency upper limit value and an output frequency lower limit value.
When the first output frequency is greater than the upper limit value of the output frequency, taking the lower limit value of the output frequency as the working frequency; when the first output frequency is smaller than the lower limit value of the output frequency, taking the upper limit value of the output frequency as the working frequency; when the first output frequency is within the output frequency range, that is, the first output frequency is less than or equal to the upper limit of the output frequency and greater than or equal to the lower limit of the output frequency, the first output frequency can be used as the working frequency. The mode is favorable for searching the proper working frequency in the output frequency range, and the working frequency beyond the output frequency range is avoided.
After the operating frequency is determined, in step S5, the operating frequency is output to the load, and the electromagnetic heater operates at the currently determined operating frequency. And the current phase acquisition circuit and the voltage phase acquisition circuit at the load end can acquire a new current phase and a new voltage phase to perform a new round of phase difference calculation and frequency adjustment.
Another aspect of the present application further discloses an electromagnetic heating frequency conversion system 100, as shown in fig. 5, including: a parameter setting device 110, configured to set an operating parameter, where the operating parameter includes an output frequency range and a phase difference range; the detection device 120 is connected to the load end, and is configured to obtain a phase difference between a current and a voltage at the load end; first comparing means 130, connected to said detecting means 120 and said parameter setting means 110, for comparing said phase difference value with said phase difference range; a frequency adjusting device 140, connected to the first comparing device 130, for adjusting an output frequency according to a comparison result between the phase difference value and the phase difference range to obtain a first output frequency; a second comparing device 150, connected to the frequency modulating device and the parameter setting device 110, for comparing the first output frequency with the output frequency range to determine an operating frequency; and an output device 160, connected to the second comparing device 150 and the load terminal, for outputting the operating frequency to the load terminal.
Above-mentioned electromagnetic heating frequency conversion system 100 through setting up reasonable phase difference scope and output frequency range, carries out quick, accurate regulation to electromagnetic heater's output frequency, can confirm suitable operating frequency fast to, because the accommodation process can be gone on dynamically, consequently, even the load changes, through above-mentioned electromagnetic heating frequency conversion system 100, still can adjust to the operating frequency who is fit for current load according to the change of load fast.
In one example, the output frequency range includes an output frequency upper limit value and an output frequency lower limit value, and the phase difference range includes a phase difference lower limit value and a phase difference upper limit value; the output frequency upper limit value is greater than or equal to the output frequency lower limit value, and the phase difference upper limit value is greater than or equal to the phase difference lower limit value. The phase difference range can be used for comparing with the actually obtained phase difference value, and the comparison result can be used as the basis for adjusting the output frequency; the output frequency range can be used for evaluating the adjusted output frequency again so as to avoid damage to the electromagnetic heater caused by too large or too small adjusted output frequency. Optionally, the operating parameters to be set further include an initial operating frequency.
In one example, the frequency adjustment device 140 is configured to perform the following steps: when the phase difference value is larger than the phase difference upper limit value, increasing a preset frequency value to the output frequency to obtain a first output frequency; when the phase difference value is smaller than the phase difference lower limit value, reducing the output frequency by the preset frequency value to obtain the first output frequency; and when the phase difference value is greater than or equal to the phase difference lower limit value and less than or equal to the phase difference upper limit value, taking the output frequency as the first output frequency.
In one example, the second comparing device 150 is configured to perform the following steps: when the first output frequency is greater than the upper limit value of the output frequency, taking the lower limit value of the output frequency as the working frequency; when the first output frequency is smaller than the lower limit value of the output frequency, taking the upper limit value of the output frequency as the working frequency; and when the first output frequency is less than or equal to the upper limit value of the output frequency and greater than or equal to the lower limit value of the output frequency, taking the first output frequency as the working frequency.
The present application further discloses an electromagnetic heating machine, which includes the electromagnetic heating frequency conversion system 100 in any of the above embodiments.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (10)
1. An electromagnetic heating frequency conversion method is characterized by comprising the following steps:
setting working parameters of the electromagnetic heater, wherein the working parameters comprise: an output frequency range and a phase difference range;
acquiring a phase difference value between a current phase and a voltage phase of a load end; adjusting the output frequency of the electromagnetic heater according to the phase difference value and the phase difference range to obtain a first output frequency;
determining an operating frequency according to the first output frequency and the output frequency range;
outputting the operating frequency to a load;
the obtaining a phase difference value between a current phase and a voltage phase of a load end includes:
acquiring a voltage phase value and a current phase value of the load end;
inputting the voltage phase value and the current phase value into a phase difference timer, and calculating to obtain a time difference between the voltage phase and the current phase;
and obtaining the phase difference value according to the time difference.
2. The electromagnetic heating frequency conversion method according to claim 1, wherein the output frequency range includes an output frequency upper limit value and an output frequency lower limit value, and the phase difference range includes a phase difference lower limit value and a phase difference upper limit value;
the output frequency upper limit value is greater than or equal to the output frequency lower limit value, and the phase difference upper limit value is greater than or equal to the phase difference lower limit value.
3. The electromagnetic heating frequency conversion method according to claim 2, wherein the adjusting the output frequency according to the phase difference value and the phase difference range to obtain a first output frequency comprises:
comparing the phase difference value with the phase difference range, and increasing the output frequency by a preset frequency value when the phase difference value is larger than the phase difference upper limit value to obtain the first output frequency;
when the phase difference value is smaller than the phase difference lower limit value, reducing the output frequency by the preset frequency value to obtain the first output frequency;
and when the phase difference value is greater than or equal to the phase difference lower limit value and less than or equal to the phase difference upper limit value, taking the output frequency as the first output frequency.
4. The electromagnetic heating frequency conversion method according to claim 2, wherein the determining an operating frequency according to the first output frequency and the output frequency range comprises:
when the first output frequency is greater than the upper limit value of the output frequency, taking the lower limit value of the output frequency as the working frequency;
when the first output frequency is smaller than the lower limit value of the output frequency, taking the upper limit value of the output frequency as the working frequency;
and when the first output frequency is smaller than or equal to the upper limit value of the output frequency and is greater than or equal to the lower limit value of the output frequency, taking the first output frequency as the working frequency.
5. The electromagnetic heating frequency conversion method according to claim 1, wherein the obtaining the phase difference according to the time difference comprises:
and matching the corresponding phase difference from the corresponding relationship between the pre-established time difference value and the phase difference value by adopting the time difference.
6. An electromagnetic heating frequency conversion system, characterized by comprising:
the parameter setting device is used for setting working parameters, and the working parameters comprise an output frequency range and a phase difference range;
the detection device is connected with the load end and used for acquiring the phase difference value of the current and the voltage of the load end;
the first comparison device is connected with the detection device and the parameter setting device and is used for comparing the phase difference value with the phase difference range;
the frequency adjusting device is connected with the first comparing device and used for adjusting the output frequency according to the comparison result of the phase difference value and the phase difference range to obtain a first output frequency;
the second comparison device is connected with the frequency adjusting device and the parameter setting device and is used for comparing the first output frequency with the output frequency range and determining the working frequency;
the output device is connected with the second comparison device and the load end and is used for outputting the working frequency to the load end;
the detection apparatus is configured to:
acquiring a voltage phase value and a current phase value of the load end;
inputting the voltage phase value and the current phase value into a phase difference timer, and calculating to obtain a time difference between the voltage phase and the current phase;
and obtaining the phase difference value according to the time difference.
7. The electromagnetic heating frequency conversion system of claim 6, wherein the output frequency range comprises an upper output frequency limit and a lower output frequency limit, and the phase difference range comprises a lower phase difference limit and an upper phase difference limit;
the output frequency upper limit value is greater than or equal to the output frequency lower limit value, and the phase difference upper limit value is greater than or equal to the phase difference lower limit value.
8. The electromagnetic heating frequency conversion system of claim 7, wherein the frequency adjustment device is configured to:
when the phase difference value is larger than the phase difference upper limit value, increasing a preset frequency value to the output frequency to obtain a first output frequency;
when the phase difference value is smaller than the phase difference lower limit value, reducing the output frequency by the preset frequency value to obtain a first output frequency;
and when the phase difference value is greater than or equal to the phase difference lower limit value and less than or equal to the phase difference upper limit value, taking the output frequency as the first output frequency.
9. The electromagnetic heating frequency conversion system of claim 7, wherein the second comparison device is configured to:
when the first output frequency is larger than the upper limit value of the output frequency, taking the lower limit value of the output frequency as the working frequency;
when the first output frequency is smaller than the lower limit value of the output frequency, taking the upper limit value of the output frequency as the working frequency;
and when the first output frequency is less than or equal to the upper limit value of the output frequency and greater than or equal to the lower limit value of the output frequency, taking the first output frequency as the working frequency.
10. An electromagnetic heating machine, characterized in that the electromagnetic heating machine comprises the electromagnetic heating frequency conversion system of any one of claims 6 to 9.
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