CN108076544A - Resonant frequency control method, resonant frequency control device and electromagnetic heating system - Google Patents
Resonant frequency control method, resonant frequency control device and electromagnetic heating system Download PDFInfo
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- CN108076544A CN108076544A CN201611004552.5A CN201611004552A CN108076544A CN 108076544 A CN108076544 A CN 108076544A CN 201611004552 A CN201611004552 A CN 201611004552A CN 108076544 A CN108076544 A CN 108076544A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000006698 induction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
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- Electromagnetism (AREA)
- General Induction Heating (AREA)
Abstract
The present invention relates to electromagnetic heating technique fields, disclose a kind of resonant frequency control method, resonant frequency control device and electromagnetic heating system, it solves electromagnetic oven working frequency and changes the excessive electromagnetic interference brought, noise jamming, the problem of component reliability is bad.The described method includes：Detect the current resonant frequency of resonance circuit in electromagnetic heating system；Judge the current resonant frequency whether in default resonant frequency range；When the current resonant frequency is not in the default resonant frequency range, the current resonant frequency is adjusted as the setting value in the default resonant frequency range.The process of resonant frequency of the embodiment of the present invention suitable for controlling resonance circuit electromagnetic heating system.
Description
Technical Field
The invention relates to the technical field of electromagnetic heating, in particular to a resonant frequency control method, a resonant frequency control device and an electromagnetic heating system.
Background
In the process of electromagnetic heating, a circuit diagram of a resonant circuit is shown in fig. 1, C103 in the circuit diagram is a resonant capacitor, resonant voltages are output from two ends 1 and 2 of the resonant capacitor, and a waveform diagram of the resonant voltages is shown in fig. 2. It can be seen from fig. 2 that the resonance voltage oscillates periodically with a certain frequency, i.e. the frequency of the resonance voltage of the resonance circuit, referred to as resonance frequency for short. The resonant voltage period shown in fig. 2 is 40 us. In the use of electromagnetism stove in daily life, because the pan kind that the user used is different, it is very big to the resonant frequency influence of the resonant circuit of electromagnetism stove, and resonant frequency's change can make electromagnetic interference frequency change, and noise frequency changes to probably lead to electromagnetic interference, noise interference, power fluctuation, cause the safety problem even when serious.
Disclosure of Invention
The embodiment of the invention provides a resonant frequency control method, a resonant frequency control device and an electromagnetic heating system, and solves the problems of electromagnetic interference, noise interference and poor component reliability caused by overlarge working frequency change of an induction cooker.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
the invention provides a resonant frequency control method, which comprises the following steps:
detecting a current resonant frequency of a resonant circuit in the electromagnetic heating system;
judging whether the current resonant frequency is within a preset resonant frequency range;
and when the current resonance frequency is not in the preset resonance frequency range, adjusting the current resonance frequency to be a set value in the preset resonance frequency range.
Optionally, the detecting a current resonant frequency of a resonant circuit in the electromagnetic heating system includes:
and detecting the current resonance voltage peak frequency of a resonance circuit in the electromagnetic heating system at preset time intervals, wherein the current resonance voltage peak frequency is the current resonance frequency.
Optionally, before the determining whether the current resonant frequency is within the preset resonant frequency range, the method further includes:
presetting a preset resonant frequency range corresponding to each power gear of the electromagnetic heating system;
acquiring a current power gear of the electromagnetic heating system;
and adjusting a preset resonant frequency range corresponding to the current power gear.
Optionally, when the current resonant frequency is not within the preset resonant frequency range, adjusting the current resonant frequency to a set value within the preset resonant frequency range includes:
when the current resonance frequency exceeds the upper limit value of the preset resonance frequency range, adjusting the current resonance frequency to be the upper limit value; or,
and when the current resonance frequency is lower than the lower limit value of the preset resonance frequency range, adjusting the current resonance frequency to be the lower limit value.
Optionally, the method further includes:
and when the current resonant frequency is within the preset resonant frequency range, the resonant circuit continues to work according to the current resonant frequency.
The present invention also provides a resonant frequency control device, comprising: a voltage dividing circuit and a processing device, wherein two ends of the voltage dividing circuit are connected with two ends of a resonance capacitor of a resonance circuit in the electromagnetic heating system, the processing device is connected with the voltage dividing circuit,
the voltage division circuit is used for detecting resonance voltage at two ends of the resonance capacitor and reducing the resonance voltage to be below a preset voltage;
the processing device comprises:
the detection unit is used for detecting the current resonance frequency of a resonance circuit in the electromagnetic heating system;
the judging unit is used for judging whether the current resonant frequency is within a preset resonant frequency range;
and the adjusting unit is used for adjusting the current resonance frequency to be a set value in the preset resonance frequency range when the current resonance frequency is not in the preset resonance frequency range.
Optionally, the detection unit includes a comparator circuit, and the comparator circuit is connected to the voltage dividing circuit and is configured to detect a current peak resonant voltage frequency of a resonant circuit in the electromagnetic heating system, where the current peak resonant voltage frequency is the current resonant frequency.
Optionally, the processing apparatus further includes:
the preset unit is used for presetting preset resonant frequency ranges corresponding to all power gears of the electromagnetic heating system;
the acquisition unit is used for acquiring the current power gear of the electromagnetic heating system;
and the adjusting unit is used for adjusting a preset resonant frequency range corresponding to the current power gear.
Optionally, the adjusting unit is further configured to adjust the current resonant frequency to be an upper limit value when the current resonant frequency exceeds the upper limit value of the preset resonant frequency range; or when the current resonance frequency is lower than the lower limit value of the preset resonance frequency range, adjusting the current resonance frequency to be the lower limit value.
The invention also provides an electromagnetic heating system which comprises the resonant frequency control device.
The current resonance frequency of the resonance circuit in the electromagnetic heating system is detected, whether the current resonance frequency is in a preset resonance frequency range is judged, and if the current resonance frequency is not in the preset resonance frequency range, the current resonance frequency is adjusted to be a set value in the preset resonance frequency range. By the method, the working frequency range of the electromagnetic heating system is limited, the problems of electromagnetic interference and noise interference caused by overlarge change of the resonant frequency are solved, and the stability of the resonant frequency is ensured.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a circuit diagram of a resonant circuit in an electromagnetic heating system;
FIG. 2 is a waveform diagram of a resonant voltage of a resonant circuit in an electromagnetic heating system;
fig. 3 is a flowchart of a resonant frequency control method according to an embodiment of the present invention;
FIG. 4 is a flow chart of another method for controlling the resonant frequency according to an embodiment of the present invention;
fig. 5 is a structural diagram of a resonant frequency control apparatus according to an embodiment of the present invention;
fig. 6 is a structural diagram of another resonant frequency control apparatus according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The embodiment of the invention provides a resonant frequency control method aiming at controlling the resonant frequency of a resonant circuit in an electromagnetic heating system, and as shown in fig. 3, the method comprises the following steps:
301. the current resonant frequency of a resonant circuit in an electromagnetic heating system is detected.
The current resonant frequency may be detected at predetermined time intervals, for example, 125us, or may be detected continuously, which is not limited herein.
And obtaining the current resonance frequency by detecting the current resonance voltage peak frequency of a resonance circuit in the electromagnetic heating system.
302. Judging whether the current resonant frequency is within a preset resonant frequency range;
303. and when the current resonance frequency is not in the preset resonance frequency range, adjusting the current resonance frequency to be a set value in the preset resonance frequency range.
And ensuring that the set value is within the preset resonant frequency range, wherein the specific value is not limited.
The embodiment of the invention detects the current resonance frequency of a resonance circuit in an electromagnetic heating system, judges whether the current resonance frequency is in a preset resonance frequency range, and if not, adjusts the current resonance frequency to be a set value in the preset resonance frequency range. By the method, the working frequency range of the electromagnetic heating system is limited, the problems of electromagnetic interference and noise interference caused by overlarge change of the resonant frequency are solved, and the stability of the resonant frequency is ensured.
In order to understand the present invention in more detail, an embodiment of the present invention provides another resonant frequency control method, as shown in fig. 4, the method including the steps of:
401. presetting a preset resonant frequency range corresponding to each power gear of the electromagnetic heating system.
Different working power gears exist for the electromagnetic heating system, and corresponding preset frequency ranges are preset for the different power gears.
402. Acquiring a current power gear of the electromagnetic heating system;
403. a preset resonance frequency range corresponding to the current power gear is adjusted;
404. detecting the current resonance voltage peak frequency of a resonance circuit in the electromagnetic heating system at preset time intervals, wherein the current resonance voltage peak frequency is the current resonance frequency;
405. and judging whether the current resonant frequency is in a preset resonant frequency range.
For step 401 and 403, it is sufficient to ensure that the step 405 is executed before the step is executed, and it is not limited to be executed before or after the step 404.
406. And when the current resonance frequency is not in the preset resonance frequency range, adjusting the current resonance frequency to be a set value in the preset resonance frequency range.
When the current resonant frequency exceeds the upper limit value of the preset resonant frequency range, adjusting the current resonant frequency to be the upper limit value; or when the current resonance frequency is lower than the lower limit value of the preset resonance frequency range, adjusting the current resonance frequency to be the lower limit value.
When the preset resonant frequency range is [ fL, fH ], when the current resonant frequency exceeds fH, the current resonant frequency is adjusted to be fH, and when the current resonant frequency is lower than fL, the current resonant frequency is adjusted to be fL.
The current resonance frequency is adjusted to a set value within the preset resonance frequency range, and the set value is not limited to fH and fL, and may be any value within the preset resonance frequency range.
407. And when the current resonant frequency is within the preset resonant frequency range, the resonant circuit continues to work according to the current resonant frequency.
By the method, the working frequency range of the electromagnetic heating system is limited, the problems of electromagnetic interference and noise interference caused by overlarge change of the resonant frequency are solved, and the stability of the resonant frequency is ensured.
As shown in fig. 5, the embodiment of the present invention further provides a resonant frequency control device 50, which includes a voltage dividing circuit 51 and a processing device 52, wherein two ends of the voltage dividing circuit 51 are connected to two ends of a resonant capacitor 60 of a resonant circuit in an electromagnetic heating system, the processing device 52 is connected to the voltage dividing circuit 51,
the voltage dividing circuit 51 is configured to detect a resonant voltage at two ends of the resonant capacitor, and step down the resonant voltage to be lower than a preset voltage.
Since the resonant voltage at both ends of the resonant capacitor has a large value, in order to detect the resonant frequency, the resonant voltage needs to be reduced to a preset voltage, for example, 50V or less.
The voltage dividing circuit can be implemented by using a voltage dividing technology in the prior art, for example, a series resistor is used for realizing voltage division, or a special voltage divider is used for realizing voltage division, and the existing voltage dividing circuit can be implemented, and is not described herein again.
The processing device 52 includes:
a detection unit 521, configured to detect a current resonant frequency of a resonant circuit in the electromagnetic heating system;
a determining unit 522, configured to determine whether the current resonant frequency is within a preset resonant frequency range;
an adjusting unit 523, configured to adjust the current resonant frequency to a set value in the preset resonant frequency range when the current resonant frequency is not in the preset resonant frequency range.
The resonant frequency control device limits the working frequency range of the electromagnetic heating system, solves the problems of electromagnetic interference and noise interference caused by overlarge change of the resonant frequency, and ensures the stability of the resonant frequency.
Optionally, as shown in fig. 6, the detecting unit 521 includes a comparator circuit 11, where the comparator circuit 11 is connected to the voltage dividing circuit 51, and is configured to detect a current peak frequency of a resonant voltage of a resonant circuit in the electromagnetic heating system, where the current peak frequency of the resonant voltage is a current resonant frequency.
The comparator circuit may be implemented using a comparator as known in the art. The comparator circuit basically functions to compare two input voltages and output a high level voltage or a low level voltage according to the comparison result. The existing comparator circuits are of the type of zero-crossing comparator, arbitrary level comparator, hysteresis voltage comparator, window voltage comparator, and so on. In accordance with an implementation of an embodiment of the present invention, a suitable comparator circuit is selected to detect the current resonant voltage peak frequency of the resonant circuit. For example, a reference level is set, the reference level is set at one input end of the comparator circuit, the other input end of the comparator circuit is connected with the voltage dividing circuit, the resonance voltage obtained from the voltage dividing circuit after voltage reduction is compared with the reference voltage to obtain a high level and a low level, so that the inversion frequency of the output voltage of the comparator circuit is obtained, and the current resonance frequency is obtained according to the linear relation between the inversion frequency and the resonance frequency in unit time.
Optionally, the processing device 52 further includes:
a preset unit 524, configured to preset a preset resonant frequency range corresponding to each power gear of the electromagnetic heating system;
an obtaining unit 525, configured to obtain a current power gear of the electromagnetic heating system;
and the retrieving unit 526 is configured to retrieve a preset resonant frequency range corresponding to the current power gear.
Optionally, the adjusting unit 523 is further configured to adjust the current resonant frequency to be an upper limit value when the current resonant frequency exceeds the upper limit value of the preset resonant frequency range; or when the current resonance frequency is lower than the lower limit value of the preset resonance frequency range, adjusting the current resonance frequency to be the lower limit value.
In the above scheme, the current resonant frequency of the resonant circuit in the electromagnetic heating system is detected, whether the current resonant frequency is within a preset resonant frequency range is judged, and if not, the current resonant frequency is adjusted to be a set value within the preset resonant frequency range. By the method, the working frequency range of the electromagnetic heating system is limited, the problems of electromagnetic interference and noise interference caused by overlarge change of the resonant frequency are solved, and the stability of the resonant frequency is ensured.
The embodiment of the invention also provides an electromagnetic heating system which comprises the resonant frequency control device. The resonant frequency control device can be applied to an induction cooker or other household appliances with an electromagnetic heating system.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. A method of controlling a resonant frequency, comprising:
detecting a current resonant frequency of a resonant circuit in the electromagnetic heating system;
judging whether the current resonant frequency is within a preset resonant frequency range;
and when the current resonance frequency is not in the preset resonance frequency range, adjusting the current resonance frequency to be a set value in the preset resonance frequency range.
2. The method of claim 1, wherein detecting the current resonant frequency of a resonant circuit in an electromagnetic heating system comprises:
and detecting the current resonance voltage peak frequency of a resonance circuit in the electromagnetic heating system at preset time intervals, wherein the current resonance voltage peak frequency is the current resonance frequency.
3. The method according to claim 1, further comprising, before said determining whether the current resonance frequency is within a preset resonance frequency range:
presetting a preset resonant frequency range corresponding to each power gear of the electromagnetic heating system;
acquiring a current power gear of the electromagnetic heating system;
and adjusting a preset resonant frequency range corresponding to the current power gear.
4. The method according to claim 1, wherein the adjusting the current resonance frequency to a set value within the preset resonance frequency range when the current resonance frequency is not within the preset resonance frequency range comprises:
when the current resonance frequency exceeds the upper limit value of the preset resonance frequency range, adjusting the current resonance frequency to be the upper limit value; or,
and when the current resonance frequency is lower than the lower limit value of the preset resonance frequency range, adjusting the current resonance frequency to be the lower limit value.
5. The method of claim 1, further comprising:
and when the current resonant frequency is within the preset resonant frequency range, the resonant circuit continues to work according to the current resonant frequency.
6. A resonance frequency control apparatus, characterized by comprising: a voltage dividing circuit and a processing device, wherein two ends of the voltage dividing circuit are connected with two ends of a resonance capacitor of a resonance circuit in the electromagnetic heating system, the processing device is connected with the voltage dividing circuit,
the voltage division circuit is used for detecting resonance voltage at two ends of the resonance capacitor and reducing the resonance voltage to be below a preset voltage;
the processing device comprises:
the detection unit is used for detecting the current resonance frequency of a resonance circuit in the electromagnetic heating system;
the judging unit is used for judging whether the current resonant frequency is within a preset resonant frequency range;
and the adjusting unit is used for adjusting the current resonance frequency to be a set value in the preset resonance frequency range when the current resonance frequency is not in the preset resonance frequency range.
7. The apparatus according to claim 6, wherein the detecting unit comprises a comparator circuit connected to the voltage dividing circuit for detecting a current resonant voltage peak frequency of a resonant circuit in the electromagnetic heating system, the current resonant voltage peak frequency being the current resonant frequency.
8. The resonance frequency control apparatus according to claim 6,
the processing apparatus further comprises:
the preset unit is used for presetting preset resonant frequency ranges corresponding to all power gears of the electromagnetic heating system;
the acquisition unit is used for acquiring the current power gear of the electromagnetic heating system;
and the adjusting unit is used for adjusting a preset resonant frequency range corresponding to the current power gear.
9. The resonance frequency control apparatus according to claim 6, wherein the adjusting unit is further configured to adjust the current resonance frequency to an upper limit value of the preset resonance frequency range when the current resonance frequency exceeds the upper limit value; or when the current resonance frequency is lower than the lower limit value of the preset resonance frequency range, adjusting the current resonance frequency to be the lower limit value.
10. An electromagnetic heating system, characterized in that it comprises a resonance frequency control device according to any one of claims 6-9.
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| CN201611004552.5A CN108076544B (en) | 2016-11-15 | 2016-11-15 | Resonance frequency control method, resonance frequency control device and electromagnetic heating system |
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| CN201611004552.5A CN108076544B (en) | 2016-11-15 | 2016-11-15 | Resonance frequency control method, resonance frequency control device and electromagnetic heating system |
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| CN108076544B CN108076544B (en) | 2022-03-04 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358537A (en) * | 2018-09-30 | 2019-02-19 | 珠海格力电器股份有限公司 | Control system and control method for reducing noise of electromagnetic cooking appliance and cooking appliance |
| CN110567006A (en) * | 2019-08-27 | 2019-12-13 | 珠海格力电器股份有限公司 | Induction cooker resonant frequency control method and device and induction cooker |
| CN111385924A (en) * | 2018-12-29 | 2020-07-07 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating appliance and control method and device thereof |
| CN114024579A (en) * | 2021-11-03 | 2022-02-08 | Oppo广东移动通信有限公司 | Method, device, chip, terminal and readable storage medium for adjusting resonant frequency |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102403923A (en) * | 2011-09-01 | 2012-04-04 | 阳春丽 | PWM (pulse width modulation) phase-shifting control method |
| CN102711298A (en) * | 2012-05-23 | 2012-10-03 | 美的集团有限公司 | Heating control device and control method for induction cooker |
| US20120275200A1 (en) * | 2011-04-29 | 2012-11-01 | Bajan Liviu | Resonant Circuit Inverter With Controllable Operating Point |
| CN202551390U (en) * | 2012-01-18 | 2012-11-21 | 洛阳升华感应加热有限公司 | Parallel resonance induction heating power frequency adaptive circuit |
| CN102821501A (en) * | 2012-08-20 | 2012-12-12 | 九阳股份有限公司 | Induction cooker control circuit suitable for cookers of different materials and power control method |
| CN103079435A (en) * | 2010-04-15 | 2013-05-01 | E.G.O.电气设备制造股份有限公司 | Cooking vessel, heating device and cooking system |
| CN103634957A (en) * | 2012-08-27 | 2014-03-12 | 戴政祺 | High frequency heating device and frequency control method thereof |
| CN203775445U (en) * | 2013-11-15 | 2014-08-13 | 美的集团股份有限公司 | Electromagnetic heating system |
| CN204520274U (en) * | 2015-04-07 | 2015-08-05 | 佛山市顺德区美的电热电器制造有限公司 | Cooking apparatus and the electric heater unit for cooking apparatus |
| CN204906749U (en) * | 2015-08-17 | 2015-12-23 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and switch tube open controlling means thereof |
| US20160026132A1 (en) * | 2014-07-22 | 2016-01-28 | Canon Kabushiki Kaisha | Heat-fixing device |
| US20160219654A1 (en) * | 2015-01-27 | 2016-07-28 | Lg Electronics Inc. | Power converter and cooking apparatus including the same |
| CN105960041A (en) * | 2016-04-28 | 2016-09-21 | 佛山市顺德区美的电热电器制造有限公司 | Dry burning detection method and device and electromagnetic heating device |
-
2016
- 2016-11-15 CN CN201611004552.5A patent/CN108076544B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103079435A (en) * | 2010-04-15 | 2013-05-01 | E.G.O.电气设备制造股份有限公司 | Cooking vessel, heating device and cooking system |
| US20120275200A1 (en) * | 2011-04-29 | 2012-11-01 | Bajan Liviu | Resonant Circuit Inverter With Controllable Operating Point |
| CN102403923A (en) * | 2011-09-01 | 2012-04-04 | 阳春丽 | PWM (pulse width modulation) phase-shifting control method |
| CN202551390U (en) * | 2012-01-18 | 2012-11-21 | 洛阳升华感应加热有限公司 | Parallel resonance induction heating power frequency adaptive circuit |
| CN102711298A (en) * | 2012-05-23 | 2012-10-03 | 美的集团有限公司 | Heating control device and control method for induction cooker |
| CN102821501A (en) * | 2012-08-20 | 2012-12-12 | 九阳股份有限公司 | Induction cooker control circuit suitable for cookers of different materials and power control method |
| CN103634957A (en) * | 2012-08-27 | 2014-03-12 | 戴政祺 | High frequency heating device and frequency control method thereof |
| CN203775445U (en) * | 2013-11-15 | 2014-08-13 | 美的集团股份有限公司 | Electromagnetic heating system |
| US20160026132A1 (en) * | 2014-07-22 | 2016-01-28 | Canon Kabushiki Kaisha | Heat-fixing device |
| US20160219654A1 (en) * | 2015-01-27 | 2016-07-28 | Lg Electronics Inc. | Power converter and cooking apparatus including the same |
| CN204520274U (en) * | 2015-04-07 | 2015-08-05 | 佛山市顺德区美的电热电器制造有限公司 | Cooking apparatus and the electric heater unit for cooking apparatus |
| CN204906749U (en) * | 2015-08-17 | 2015-12-23 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and switch tube open controlling means thereof |
| CN105960041A (en) * | 2016-04-28 | 2016-09-21 | 佛山市顺德区美的电热电器制造有限公司 | Dry burning detection method and device and electromagnetic heating device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358537A (en) * | 2018-09-30 | 2019-02-19 | 珠海格力电器股份有限公司 | Control system and control method for reducing noise of electromagnetic cooking appliance and cooking appliance |
| CN111385924A (en) * | 2018-12-29 | 2020-07-07 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating appliance and control method and device thereof |
| CN110567006A (en) * | 2019-08-27 | 2019-12-13 | 珠海格力电器股份有限公司 | Induction cooker resonant frequency control method and device and induction cooker |
| CN114024579A (en) * | 2021-11-03 | 2022-02-08 | Oppo广东移动通信有限公司 | Method, device, chip, terminal and readable storage medium for adjusting resonant frequency |
| CN114024579B (en) * | 2021-11-03 | 2022-11-04 | Oppo广东移动通信有限公司 | Method, device, chip, terminal and readable storage medium for adjusting resonant frequency |
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| Publication number | Publication date |
|---|---|
| CN108076544B (en) | 2022-03-04 |
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