CN112020164A - Radio frequency heating circuit and radio frequency heating equipment - Google Patents
Radio frequency heating circuit and radio frequency heating equipment Download PDFInfo
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- CN112020164A CN112020164A CN201910472921.0A CN201910472921A CN112020164A CN 112020164 A CN112020164 A CN 112020164A CN 201910472921 A CN201910472921 A CN 201910472921A CN 112020164 A CN112020164 A CN 112020164A
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- radio frequency
- power
- amplifier
- circuit
- attenuator
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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
- H05B6/64—Heating using microwaves
- H05B6/66—Circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
Abstract
The application relates to a radio frequency heating circuit and radio frequency heating device, this radio frequency heating circuit includes: the radio frequency switch comprises a radio frequency source, an attenuator, a power amplifier and a radio frequency switch; wherein the attenuator is connected with the radio frequency source and is configured to adjust the peak power of the radio frequency signal transmitted by the radio frequency source to the rated input power of the power amplifier; the radio frequency switch is connected with the attenuator and is configured to modulate the radio frequency signal subjected to peak value adjustment; the power amplifier is connected with the radio frequency switch and is configured to amplify the power of the modulated radio frequency signal to a set output power so as to meet the heating requirement. According to the embodiment of the disclosure, the peak power of the radio frequency signal is adjusted to the rated input power of the power amplifier through the attenuator, and the radio frequency signal after the peak adjustment is modulated by combining the radio frequency switch, so that the power amplifier operates efficiently under the condition that the output power meets the heating requirement, and the energy utilization rate is improved.
Description
Technical Field
The present application relates to the field of microwave technology, and for example, to a radio frequency heating circuit and a radio frequency heating apparatus.
Background
At present, due to the advantages of low cost and small size of the semiconductor solid-state rf source and the technical advantage of good controllability of the rf signal emitted by the semiconductor solid-state rf source, more and more rf heating devices use the solid-state rf source to generate the rf energy signal for heating. The output power of the solid-state radio frequency source can be adjusted within a set frequency range to meet the heating requirements of different articles. The rf heating device disclosed in the related art includes an adjustable attenuator, by which the rf power emitted by the rf source is adjusted so that the output power of the rf heating device meets different heating requirements.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art: the energy utilization rate of the radio frequency heating equipment is the highest when the output power of the radio frequency heating equipment is the rated output power, at the moment, the operation efficiency of the power amplifier is the highest, but in the process of adjusting the output power for meeting different heating requirements, along with the reduction of the output power, the power amplifier in the radio frequency heating equipment cannot operate efficiently, so that the energy utilization rate of the radio frequency heating equipment is reduced.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a radio frequency heating circuit and radio frequency heating equipment, and aims to solve the problem that the energy utilization rate is reduced along with the reduction of the output power of the radio frequency heating equipment in order to meet different heating requirements.
In some embodiments, the radio frequency heating circuit comprises a radio frequency source, an attenuator, a power amplifier, and a radio frequency switch;
the attenuator is connected with the radio frequency source and is configured to adjust the peak power of the radio frequency signal transmitted by the radio frequency source to the maximum rated output power of the power amplifier;
the radio frequency switch is connected with the attenuator and is configured to modulate the radio frequency signal subjected to peak value adjustment;
the power amplifier is connected with the radio frequency switch and is configured to amplify the power of the modulated radio frequency signal to a set output power so as to meet the heating requirement.
In some embodiments, the rf heating apparatus includes the rf heating circuit described above.
The radio frequency heating circuit and the radio frequency heating device provided by the embodiment of the disclosure can realize the following technical effects:
the peak power of the radio frequency signal is adjusted to the rated input power of the power amplifier through the attenuator, and the radio frequency signal after the peak adjustment is modulated by combining the radio frequency switch, so that the power amplifier operates efficiently under the condition that the output power meets the heating requirement, and the energy utilization rate is improved.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
fig. 1 is a schematic structural diagram of a radio frequency heating circuit provided in an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a radio frequency heating circuit provided in an embodiment of the present disclosure;
fig. 3 is a waveform diagram of a modulated wave and radio frequency signals before and after modulation provided by an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a radio frequency heating circuit provided in an embodiment of the present disclosure;
reference numerals:
101: a radio frequency source; 102: an attenuator; 103: a power amplifier; 104: a radio frequency switch; 105: a controller; 106: a circulator; 107: and (4) protecting the resistor.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
In the application of the rf heating device, the required heating power may vary according to the material, volume or application of the heated material. The power of the initial rf signal is different to meet different heating requirements. According to different performances of the radio frequency heating device, rated input power of a power amplifier in the radio frequency heating device is different. The power amplifier operates most efficiently when the peak power of the signal input to the power amplifier is equal to the nominal input power of the power amplifier. When the peak power of the initial radio frequency signal is lower than that of the power amplifier, the power amplifier cannot operate at low efficiency, the energy consumption is high, and the energy utilization rate is reduced.
As shown in fig. 1, the radio frequency heating circuit provided in this embodiment includes a radio frequency source 101, an attenuator 102, a power amplifier 103, and a radio frequency switch 104.
The attenuator 102 is connected to the rf source 101, and is configured to adjust a peak power of the rf signal transmitted by the rf source 101 to a rated input power of the power amplifier 103.
And a radio frequency switch 104 connected to the attenuator 102 and configured to modulate the peak-adjusted radio frequency signal.
And the power amplifier 103 is connected with the radio frequency switch 104 and configured to amplify the power of the modulated radio frequency signal to a set output power so as to meet the heating requirement.
The attenuator 101 adjusts the peak power of the initial rf signal to maintain the power amplifier 103 operating at an optimal operating efficiency. In this case, if a continuous rf signal is output to the power amplifier 103, the output power per unit time is increased, which exceeds the heating requirement, and in a serious case, the quality of the object to be heated is deteriorated. The radio frequency switch 102 modulates the power signal to obtain a modulated signal, and adjusts the output power to a set output power under the condition that the peak power of the modulated signal is ensured to be equal to the rated input power of the power amplifier 103 and the power amplifier 103 operates efficiently.
According to the embodiment of the disclosure, the peak power of the radio frequency signal is adjusted to the rated input power of the power amplifier through the attenuator, and the radio frequency signal after the peak adjustment is modulated by combining the radio frequency switch, so that the power amplifier operates efficiently under the condition that the output power meets the heating requirement, and the energy utilization rate is improved.
As shown in fig. 2, in some embodiments, the rf heating circuit further includes a controller 105.
Wherein the controller 105 is configured to acquire the modulated wave.
The rf switch 104 is configured to modulate the peak-adjusted rf signal according to the modulation wave.
The rf switch 104 modulates the rf signal after peak adjustment, so as to ensure that the output power is equal to the set output power in unit time.
In some embodiments, the controller 105 is configured to generate the modulated wave according to the set output power and a rated output power of the radio frequency heating circuit.
The modulation wave has various forms, and optionally, the modulation wave is one or more of a sine wave, a sawtooth wave and a rectangular wave.
Optionally, one or more of the pulse width and the phase of the modulation wave are determined according to the set output power and the rated output power of the radio frequency heating device.
In some embodiments, as shown in fig. 3, the modulated wave is a rectangular wave.
A controller 105 configured to determine a duty ratio according to the set output power and the rated output power, and generate the modulation wave according to the duty ratio.
In some embodiments, the duty cycle is determined from a ratio of the set output power to the rated output power.
For example: when the rated output power of the radio frequency heating device is 1000W and the currently required heating power is 400W, the duty ratio is 40 percent; when the rated output power of the radio frequency heating device is 1000W and the currently required heating power is 500W, the duty ratio is 50%.
Specifically, as shown in fig. 3, waveforms of the rf signals before and after being modulated by the rf switch 104 are shown.
In some embodiments, the rf switch 104 is further configured to control an operating state of the power amplifier 103 according to the modulation wave.
Taking the example shown in fig. 3, the modulation wave is a rectangular wave, and when the rectangular wave signal is at a high level, the power amplifier 103 is controlled to be in the power-on operation state, and when the rectangular wave signal is at a low level, the power amplifier 103 is controlled to be in the power-off state. The power amplifier 103 is prevented from being operated to increase energy consumption when the rectangular wave signal is at a low level.
In some embodiments, the power amplifier 103 includes: a primary amplifier, a penultimate amplifier, and a final amplifier.
In some embodiments, the rf switch 104 is configured to control an operation state of one or more of the primary amplifier, the secondary final amplifier, and the final amplifier according to the modulation wave.
In some embodiments, a radio frequency switch 104 configured to control the penultimate amplifier and the final amplifier according to the modulation wave. In the multi-stage amplifier of the power amplifier 103, the penultimate amplifier and the final amplifier consume larger direct current power, so that, in order to reduce the energy consumed by the radio frequency heating device and simultaneously avoid current instability caused by frequent turning on and off of the power amplifier 103 and damage to the power amplifier 103, the radio frequency switch 104 only controls the penultimate amplifier and the final amplifier without adjusting the state of the primary amplifier.
In some embodiments, the attenuator 102 is configured to adjust a peak power of a radio frequency signal emitted by the radio frequency source to the next or nominal input power of the final amplifier.
In some embodiments, as shown in this fig. 4, the rf heating circuit further comprises: a circulator 106 and a protection resistor 107.
The circulator 106 is a device that allows electromagnetic waves to be transmitted in a unidirectional ring shape. Such as circulator 106 in this fig. 4, includes port 1, port 2, and port 3. In the process of electromagnetic wave signal transmission, a signal input from the 1 port is output from the 2 port, and a signal input from the 2 port is output from the 3 port, so that the unidirectional annular transmission of electromagnetic waves is realized.
The circulator 106 is configured to send the power signal reflected by the heated space to the protection resistor 107, and can prevent the power signal reflected by the heated space from being transferred to the power amplifier 103 and affecting the working performance of the power amplifier 103.
A protection resistor 107 configured to consume the power signal reflected back by the heated space. The resistance of the protection resistor 107 is adapted to the impedance of the rf source 105 to improve the energy utilization of the rf heating device.
The embodiment of the present disclosure further provides a radio frequency heating device, which includes the radio frequency heating circuit provided in the foregoing embodiment. The radio frequency heating circuit is arranged between the heating cavity of the radio frequency heating equipment and the shell.
According to the radio frequency heating equipment provided by the embodiment of the disclosure, the peak power of the radio frequency signal is adjusted to the rated input power of the power amplifier through the attenuator, and the radio frequency signal after the peak adjustment is modulated by combining the radio frequency switch, so that the power amplifier operates efficiently under the condition that the output power meets the heating requirement, and the energy utilization rate is improved.
In some embodiments, the rf heating apparatus further comprises a power selection module.
Wherein, the power selection module is connected to the rf switch 104 and configured to select and set the output power. And the radio frequency switch 104 modulates the radio frequency signal subjected to peak value adjustment according to the set output power.
In some embodiments, the power selection module is connected to the controller 105, the controller 105 generates a modulation wave according to the set output power and the rated output power of the rf heating device, and the rf switch 104 modulates the rf signal after peak adjustment according to the modulation wave.
The radio frequency heating equipment provided by the embodiment of the disclosure is a microwave oven, a dryer or a thawing machine.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the disclosed embodiments includes the full ambit of the claims, as well as all available equivalents of the claims. As used in this application, although the terms "first," "second," etc. may be used in this application to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, unless the meaning of the description changes, so long as all occurrences of the "first element" are renamed consistently and all occurrences of the "second element" are renamed consistently. The first and second elements are both elements, but may not be the same element. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other.
The disclosed embodiments are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the embodiments of the present disclosure is limited only by the appended claims.
Claims (10)
1. A radio frequency heating circuit comprising a radio frequency source, an attenuator, and a power amplifier, further comprising: a radio frequency switch;
the attenuator is connected with the radio frequency source and is configured to adjust the peak power of the radio frequency signal transmitted by the radio frequency source to the rated input power of the power amplifier;
the radio frequency switch is connected with the attenuator and is configured to modulate the radio frequency signal subjected to peak value adjustment;
the power amplifier is connected with the radio frequency switch and is configured to amplify the power of the modulated radio frequency signal to a set output power so as to meet the heating requirement.
2. The circuit of claim 1, further comprising:
a controller configured to acquire a modulated wave;
the radio frequency switch is configured to modulate the peak-adjusted radio frequency signal according to the modulation wave.
3. The circuit of claim 2, wherein the controller is configured to generate the modulated wave according to the set output power and a rated output power of the radio frequency heating circuit.
4. The circuit according to claim 3, wherein the modulation wave is a rectangular wave.
5. The circuit of any of claims 2 to 4, wherein the radio frequency switch is further configured to control an operating state of the power amplifier according to the modulation wave.
6. The circuit of claim 5, wherein the power amplifier comprises: a primary amplifier, a penultimate amplifier, and a final amplifier.
7. The circuit of claim 6, wherein the radio frequency switch is configured to control an operating state of one or more of the primary amplifier, the secondary final amplifier, and the final amplifier according to the modulation wave.
8. The circuit of claim 6, wherein the attenuator is configured to adjust a peak power of a radio frequency signal transmitted by the radio frequency source to a nominal input power of the penultimate amplifier or the final amplifier.
9. A radio frequency heating apparatus comprising the radio frequency heating circuit of any one of claims 1 to 8; the radio frequency heating circuit is arranged between the heating cavity of the radio frequency heating equipment and the shell.
10. The apparatus of claim 9, further comprising:
and the power selection module is connected with the radio frequency switch and is configured to select and set the output power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910472921.0A CN112020164B (en) | 2019-05-31 | 2019-05-31 | Radio frequency heating circuit and radio frequency heating equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910472921.0A CN112020164B (en) | 2019-05-31 | 2019-05-31 | Radio frequency heating circuit and radio frequency heating equipment |
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| CN112020164A true CN112020164A (en) | 2020-12-01 |
| CN112020164B CN112020164B (en) | 2023-04-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116054851A (en) * | 2023-03-07 | 2023-05-02 | 上海安其威微电子科技有限公司 | Radio frequency chip |
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| CN1462849A (en) * | 2002-05-27 | 2003-12-24 | 三星电子株式会社 | Microwave oven and control method for same |
| CN102124814A (en) * | 2009-06-01 | 2011-07-13 | 松下电器产业株式会社 | High-frequency heating device and high-frequency heating method |
| CN103533690A (en) * | 2012-07-05 | 2014-01-22 | Nxp股份有限公司 | Microwave power source and method for automatic adjustment of work frequency |
| CN106413165A (en) * | 2016-10-31 | 2017-02-15 | 广东美的厨房电器制造有限公司 | Semiconductor microwave heating equipment, power control method thereof, and power control device thereof |
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2019
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1462849A (en) * | 2002-05-27 | 2003-12-24 | 三星电子株式会社 | Microwave oven and control method for same |
| CN102124814A (en) * | 2009-06-01 | 2011-07-13 | 松下电器产业株式会社 | High-frequency heating device and high-frequency heating method |
| CN103533690A (en) * | 2012-07-05 | 2014-01-22 | Nxp股份有限公司 | Microwave power source and method for automatic adjustment of work frequency |
| CN106413165A (en) * | 2016-10-31 | 2017-02-15 | 广东美的厨房电器制造有限公司 | Semiconductor microwave heating equipment, power control method thereof, and power control device thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116054851A (en) * | 2023-03-07 | 2023-05-02 | 上海安其威微电子科技有限公司 | Radio frequency chip |
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