US20140008357A1 - Microwave power source and method of automatic adjustement of operation frequence - Google Patents
Microwave power source and method of automatic adjustement of operation frequence Download PDFInfo
- Publication number
- US20140008357A1 US20140008357A1 US13/934,022 US201313934022A US2014008357A1 US 20140008357 A1 US20140008357 A1 US 20140008357A1 US 201313934022 A US201313934022 A US 201313934022A US 2014008357 A1 US2014008357 A1 US 2014008357A1
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- US
- United States
- Prior art keywords
- microwave
- vswr
- standing wave
- microwave oven
- power
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C7/00—Stoves or ranges heated by electric energy
- F24C7/02—Stoves or ranges heated by electric energy using microwaves
-
- 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
- H05B6/68—Circuits for monitoring or control
- H05B6/686—Circuits comprising a signal generator and power amplifier, e.g. using solid state oscillators
-
- 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
- H05B6/70—Feed lines
- H05B6/705—Feed lines using microwave tuning
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
- Electric Ovens (AREA)
Abstract
Description
- The present invention relates to household appliances, and particularly to microwave power sources and methods capable of automatically adjusting operation frequencies of microwave ovens.
- With advances of semiconductor and microwave oven technologies, it is possible for a microwave power source, as a key component of microwave oven, to be fabricated with semiconductor devices instead of magnetrons. Semiconductor microwave ovens have advantages of low voltage, high safety, long lifetime, and saving copper, steel and the like required for high-voltage transformers.
- Impedance match between a load and the source has a dominant impact on transmission of microwave power according to the theory of microwave power transmission. The impedance match may be measured by VSWR (Voltage to Standing Wave Ratio). In case of a mismatch, there are incident and reflected waves coexistent on a feed line. At positions of identical phase for the incident and reflected waves, voltage amplitudes of the waves add together to obtain the maximal amplitude Vmax, thereby forming a wave antinode. At positions of opposite phases for the incident and reflected waves, voltage amplitudes of the waves cancel with each other to obtain the minimal amplitude Vmin, thereby forming a wave node. The VSWR represents an amplitude ratio of a wave antinode to a wave node. The ideal value for VSWR is 1:1 in terms of energy transmission. As the VSWR increases, the reflected power grows, and the transmission efficiency decreases.
- Microwave power is fed into the chamber of a microwave oven from its microwave power source, and the VSWR in the oven chamber at the oven's current operation frequency is important to the performance of the microwave power source. The VSWR in the oven chamber will be affected by food placed in the chamber, such as material and volume of the food, and position where the food is placed. It is desirable that the operation frequency of the oven can vary with changes in the VSWR within the chamber, so as to achieve an optimal VSWR. However, conventional microwave ovens made with either magnetrons or semiconductors have fixed operation frequency of about 2.45 GHz. With the fixed operation frequency, the VSWR in the oven chamber will vary as food material, volume, etc., and it is difficult for the oven to operate at the optimal condition. This will lead to reduction in heating efficiency and energy waste. Moreover, in some extreme cases where metal articles is placed in the chamber, or the chamber is damaged, resulting in a poor VSWR at the fixed operation frequency, the microwave power source may also be damaged due to excessive reflection of power.
- A method is desired for adjusting the oven's operation frequency in accordance with the VSWR in the oven chamber, to solve the problems with the conventional ovens having fixed operation frequencies.
- According to an embodiment of the present invention, a microwave power source for a microwave oven is provided comprising:
- a phase-locked frequency generator configured to generate a plurality of operation frequencies;
- a standing wave detection circuit configured to detect, for each of the plurality of operation frequencies, a standing wave in a chamber of the microwave oven and provide information about the standing wave; and
- a microcontroller configured to select one of the plurality of operation frequencies based on the information about the standing wave, and control the phase-locked frequency generator to generate the selected operation frequency so that the microwave oven operates at the selected operation frequency.
- According to a further embodiment of the present invention, a method for adjusting an operation frequency of a microwave oven is provided comprising:
- upon power-on of the microwave oven, generating a plurality of operation frequencies, and detecting a standing wave in a chamber of the microwave oven for each of the plurality of operation frequencies to obtain information about the standing wave; and
- selecting one of the plurality of operation frequencies based on the information about the standing wave, and controlling the microwave oven to operate at the selected frequency.
- According to a still further embodiment of the present invention, a method for adjusting rated operating power of a microwave oven is provided comprising:
- during fabrication of the microwave oven, adjusting the output power of the microwave oven to the rated power by adjusting the gain value of a first gain control circuit of the microwave oven while maintaining the gain value of a second gain control circuit of the microwave oven at its largest value, and fixing the adjusted gain value of first gain control circuit; and
- during use of the microwave oven, adjusting the in-use output power of the microwave oven by adjusting the gain value of the second gain control circuit.
- The above and other aspects of the present invention will be more apparent from the following description of example embodiments with reference to accompanying drawings, in which:
-
FIG. 1 is a schematic block diagram of a microwave power source according to an embodiment of the present disclosure; -
FIG. 2 is a schematic block diagram of a phase-locked frequency generator; -
FIG. 3 is a schematic block diagram of a standing wave detection circuit; -
FIG. 4 is a schematic block diagram of a microwave power source according to another embodiment of the present disclosure in a case that a microstrip coupler is used as a directional coupler of a standing wave detection circuit; -
FIG. 5 is a schematic block diagram of a microwave power source according to another embodiment of the present disclosure in a case that a chamber coupler is used as a directional coupler of a standing wave detection circuit; -
FIG. 6 is a schematic block diagram of a microwave amplifier; -
FIG. 7 is a schematic block diagram of a driving amplifier; and -
FIG. 8 is a flow chart showing a method of automatically adjusting operation frequencies of a microwave oven according to an exemplary embodiment of the present disclosure. - Example embodiments according to the present disclosure will be described in detail with reference to the figures for better understanding by a person skilled in the art. The example embodiments may be implemented in different forms, and the present disclosure is not limited to those shown in the figures. Detailed description of known components or steps is omitted here, to avoid obscuring the present invention. In the figures, like reference numbers denote similar components.
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FIG. 1 is a schematic block diagram of a microwave power source for a microwave oven according to an embodiment of the present disclosure. The microwave power source may include a phase-lockedfrequency generator 1, a standing wave (SW)detection circuit 3 and amicrocontroller 5. TheSW detection circuit 3 feeds information about a standing wave within the chamber of the oven to themicrocontroller 5, which controls to adjust operation frequencies of the oven according to the SW information. Themicrocontroller 5 may be a MCU. After power-on of the oven, the phase-lockedfrequency generator 1 generates a plurality of operation frequencies. TheSW detection circuit 3 detects, for each operation frequency, a standing wave within the oven chamber and provides the SW information. Themicrocontroller 5 selects one of the operation frequencies based on the SW information, and controls the phase-lockedfrequency generator 1 to generate the selected operation frequency, so as to make the oven operate at the selected operation frequency. In an embodiment, themicrocontroller 5 may compute a VSWR for each operation frequency, and select an operation frequency corresponding to the minimal VSWR among the computed VSWRs. In this way, the microwave power source may automatically adjust operation frequencies of the oven before the oven enters its operation mode of heating food. For example, upon the power-on of the microwave oven, the microwave power source may detect the standing wave within the oven chamber, find a frequency corresponding to the minimal VSWR and adjust the oven to operate at the found frequency. This may maximize microwave heating efficiency of the oven, and solve the problem of low heating efficiency with conventional fixed-frequency microwave ovens. - In an embodiment, the phase-locked
frequency generator 1 may generate a plurality of operation frequencies over a preset range in a stepwise manner. For example, the step size may be 10MHz, and the range may be 2.35 to 2.55 GHz. - In an embodiment, the
microcontroller 5 may further compare the computed minimal VSWR with a preset safe VSWR, and control to issue a warning indicating a high VSWR, if the minimal VSWR is larger than the safe VSWR. Only when the minimal VSWR is not larger than the safe VSWR, themicrocontroller 5 selects the operation frequency corresponding to the minimal VSWR. The safe VSWR may be preset as 10:1. If the computed minimal VSWR is larger than 10:1, a high VSWR warning may be issued in the form of electric signal, optical signal or sound signal. If the computed minimal VSWR is equal to or less than 10:1, the operation frequency corresponding to the minimal VSWR may be selected so that the oven may operate at the selected frequency. In this way, it is possible to ensure that the VSWR in the chamber is at a normal range before the microwave power source outputs higher power. This can prevent the microwave power source as a key component from being damaged by any excessive VSWR, and also maximize heating efficiency. - In an embodiment, the
microcontroller 5 may compute a VSWR for each of the frequencies over the preset range, and record each frequency and its corresponding VSWR in a table of frequency-VSWR correspondence. This table may be, for example, recorded in a storage device internal or external to themicrocontroller 5. -
FIG. 2 is a schematic block diagram of the phase-lockedfrequency generator 1 shown inFIG. 1 . The phase-lockedfrequency generator 1 may include a phase-lockedfrequency source 6 and a microwave attenuator 7. Under control of themicrocontroller 5, the phase-lockedfrequency source 6 may generate operation frequencies for the microwave oven, and output respective microwave signals. The operation frequencies may be generated by changing the frequencies stepwise over a preset range. The microwave signals from the phase-lockedfrequency source 6 are inputted to the microwave attenuator 7 and outputted after being attenuated. The microwave attenuator 7 may have two operation states of a low attenuation state and a high attenuation state. As an example, the attenuation factor in the low attenuation state may be 0 dB, and the attenuation factor in the high attenuation state may be 10 dB. Which operation state the attenuator 7 will enter is controlled by themicrocontroller 5. The microwave attenuator 7 may be a digital control attenuator or an electric regulation attenuator, or may be implemented to switch between different attenuation paths by a dual-pole switch. - In an embodiment, during adjustment of operation frequency, such as upon power-on of the microwave oven, the
microcontroller 5 may control the microwave attenuator 7 to enter the high attenuation state. In this way, a solid state power amplifier of the microwave oven may operate in a low power state while the SW detection circuit detects the standing wave in the oven chamber, and may be prevented from being damaged due to excessive VSWR in the oven chamber. -
FIG. 3 is a schematic block diagram of theSW detection circuit 3 shown inFIG. 1 . TheSW detection circuit 3 may include adirectional coupler 13 and amicrowave detection circuit 14. Thedirectional coupler 13 may sample forward and reflected coupling power of microwave fed into the oven chamber, and provide the sampled coupling power to themicrowave detection circuit 14. Themicrowave detection circuit 14 may convert each of the sampled forward and reflected coupling power into a DC voltage, and provide the DC voltages to themicrocontroller 5 as the SW information. - In an embodiment, the
directional coupler 13 may sample the forward and reflected coupling power at a preset ratio (e.g., one thousandth) to obtain a forward coupling power sample Pf and a reflected coupling power sample Pr. Themicrowave detection circuit 14 may convert Pf and Pr into DC voltages, respectively. Thedirectional coupler 13 may be implemented as a high-isolation bidirectional coupler, or as two unidirectional couplers for coupling forward and reflected microwave power, respectively. Thedirectional coupler 13 may be in the form of microstrip or chamber coupler. During the process of frequency adjustment, themicrocontroller 5 may derive the power values Pf and Pr from the voltages provided by themicrowave detection circuit 14 for each frequency generated by the phase-lockedfrequency generator 1, and compute a reflection coefficient with the following formula (1): -
- Then, the
microcontroller 5 may computer the VSWR with the following formula (2): -
- The
microcontroller 5 may record each frequency and its corresponding VSWR as described above. - In an embodiment, the
microwave detection circuit 14 may be implemented as a Shottky wave detection diode or a microwave detection chip (e.g., AD8313, AD8362). The DC voltages representing Pf and Pr may be subjected to analog-to-digital conversion (ADC) to be converted into digital quantities. The ADC conversion may be implemented by a separate dedicated ADC chip, or as a function module integrated into themicrocontroller 5. In the latter case, themicrocontroller 5 may be implemented as, for example, AVR SingleChip Micyoco ATMEGA 8 having an integrated ADC. -
FIG. 4 is a schematic block diagram of a microwave power source according to another embodiment of the present disclosure in a case that a microstrip coupler is used as thedirectional coupler 13 of theSW detection circuit 3. In addition to the components (denoted by the same reference numbers) shown inFIG. 1 , the microwave power source ofFIG. 4 further comprises amicrowave amplifier 2 and a coaxial waveguide switch 4. Themicrowave amplifier 2 may be arranged between the phase-lockedfrequency generator 1 and theSW detection circuit 3, and may be configured to amplify power of low-power microwave signals from thefrequency generator 1, so that the microwave signals can be used for heating food or other objects placed in the oven chamber. The coaxial waveguide switch 4 may switch a coaxial output port of theSW detection circuit 3 using a microstrip coupler to a waveguide input port of the microwave. -
FIG. 5 is a schematic block diagram of a microwave power source according to another embodiment of the present disclosure in a case that a chamber coupler is used as thedirectional coupler 13 of theSW detection circuit 3. In this case, the coaxial waveguide switch 4 is placed before theSW detection circuit 3 as shown inFIG. 5 . - The
microwave amplifier 2 primarily functions to amplify low power microwave signals generated by thefrequency generator 1 in order to obtain a sufficient microwave power for heating, for example, 600 Watts.FIG. 6 is a schematic block diagram of themicrowave amplifier 2 shown inFIG. 4 , which includes a drivingamplifier 8 and a solidstate power amplifier 9 successively connected. The drivingamplifier 8 is connected to the phase-lockedfrequency generator 1. The solidstate power amplifier 9 is connected to thedirectional coupler 13 and further to the coaxial waveguide switch 4 via the directional coupler 13 (as shown inFIG. 4 ), or the solidstate power amplifier 9 is connected to the coaxial waveguide switch 4 and further to tdirectional coupler 13 via the coaxial waveguide switch 4 (as shown inFIG. 5 ). -
FIG. 7 is a schematic block diagram of the drivingamplifier 8. The drivingamplifier 8 may include gain control circuits A 10 andB 11, and a microwavelow power amplifier 12. The gaincontrol circuit A 10 may be sued to adjust the rated output power of the microwave oven, and the gaincontrol circuit B 11 may be used to adjust the actual output power of the microwave oven during its operation. The microwavelow power amplifier 12 may be used to amplify power of microwave signals. In particular, the gaincontrol circuit A 10 may be used to adjust the rated output power of the microwave oven during fabrication of the oven, that is, before the oven is shipped away from a fabrication plant. The gaincontrol circuit B 11 may be used by a user or consumer to adjust the in-use output power of the oven. At the fabrication stage, microwave ovens produced in the same production line may have different output powers due to inconsistency in device, circuit and/or process. Some ovens may have excessive output power larger than the rated power, and output power for other ovens may not reach the rated power. In order to ensure that every microwave oven outputs the rated power and avoid excessive output power, it is necessary to adjust the rated power for each microwave oven before it is shipped away from the fabrication plant. The adjustment may include, with the gain value of the gaincontrol circuit B 11 being maintained in its maximum, adjusting the gain value of the gaincontrol circuit A 10 so that the output power of the oven reaches the rated power. Then, the gain value of the gaincontrol circuit A 10 is fixed. A user may adjust only the gaincontrol circuit B 11, for example, via a user interface, in order to adjust the oven's in-use output power. The gain control circuits A 10 andB 11 may be variable microwave attenuators, or variable-gain microwave amplifiers, or any circuits that have adjustable gain or amplifying gain. The relative positions of the gain control circuits A 10,B 11 and the microwavelow power amplifier 12 may change. For example, the microwavelow power amplifier 12 may be arranged between the gain control circuits A 10 andB 11, or before or after the two gain control circuits. - The solid
state power amplifier 9 may use a microstrip for impedance match. Because the operating power of a microwave oven is so high that a 50 Ohm microstrip cannot endure the high-power microwave signals, the microstrip between theSW detection circuit 3 and the coaxial waveguide switch 4 has impedance less than 50 Ohm when the a microstrip coupler is used as thedirectional coupler 13 as shown inFIG. 4 . Such microstrip is wider and can endure higher power. When a chamber coupler is used as thedirectional coupler 13 as shown inFIG. 5 , the microstrip between themicrowave amplifier 2 and the coaxial waveguide switch 4 may have impedance less than 50 Ohm. Again, such microstrip is wider and can endure higher power. In an embodiment, a 35 Ohm microstrip may be used. When made from a material of dielectric constant 3.5 and with a width of 2.9 mm, the 35 Ohm microstrip will have a power capacity substantially greater than that of a 50 Ohm microstrip. - The foregoing describes the microwave power source and its components according to the example embodiments of the present disclosure.
FIG. 8 is a flow chart showing a method of automatically adjusting operation frequencies of a microwave oven according to an exemplary embodiment of the present disclosure. As above mentioned, the VSWR within the oven chamber will be affected or changed by food placed in the chamber, such as material and volume of the food, and position where the food is placed. In view of the changing VSWR, the present disclosure provides a method of SW detection and frequency adjustment upon power-on of the oven. As shown inFIG. 8 , the method may include step S702 of upon power-on of the microwave oven, generating a plurality of operation frequencies, and detecting a standing wave in a chamber of the microwave oven for each of the plurality of operation frequencies to obtain the SW information. In this step, themicrocontroller 5 may control the phase-lockedfrequency generator 1 to generate an oscillating frequency, which may be amplified by themicrowave amplifier 2 and then outputted into the chamber of the oven. TheSW detection circuit 3 may detect the SW in the oven chamber to provide DC voltages representing the forward and reflected coupling power Pf and Pr as the SW information. - The method may further include step S704 of selecting one of the plurality of operation frequencies based on the SW information, and controlling the microwave oven to operate at the selected frequency. In this step, the
microcontroller 5 may receive the DC voltages representing the forward and reflected coupling power Pf and Pr from theSW detection circuit 3. Themicrocontroller 5 may compute a VSWR for the current operation frequency based on the DC voltages, and record the current frequency and its corresponding VSWR. Then, themicrocontroller 1 may control the phase-lockedfrequency generator 1 to generate a further operation frequency by changing the current frequency in a stepwise manner. The above detection and computation processes may be performed for the further frequency, which may be recorded with its corresponding VSWR. The generation, detection, computation and recording processes may be repeated for each frequency generated over a preset frequency range, and a frequency-VSWR correspondence table may be obtained. Themicrocontroller 5 may select one of the frequencies corresponding to the minimal VSWR from the table, and control the phase-lockedfrequency generator 1 to generate the selected frequency so that the oven operates at this frequency. - In an embodiment, the method may further includes a step in which the
microcontroller 5 may compare the computed minimal VSWR with a preset safe VSWR, and control to issue a warning indicating a high VSWR, if the minimal VSWR is larger than the safe VSWR. If the minimal VSWR is not larger than the safe VSWR, themicrocontroller 5 selects the operation frequency corresponding to the minimal VSWR. - In an embodiment, upon power-on of the microwave oven, the
microcontroller 5 may control the microwave attenuator 7 to enter the high attenuation state. In this way, a final-stage power amplifier of the microwave oven may operate in a low power state while the SW detection circuit detects the standing wave in the oven chamber, and may be prevented from being damaged due to excessive VSWR in the oven chamber. - The example embodiments of the present disclosure have been described above. It should be noted that the present disclosure is not limited to the example embodiments. A person skilled in the art will appreciate that structures and details in the present disclosure may be modified in various manner without departing from the principle of the present disclosure.
Claims (19)
Applications Claiming Priority (2)
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CN201210232055.6 | 2012-07-05 | ||
CN201210232055.6A CN103533690A (en) | 2012-07-05 | 2012-07-05 | Microwave power source and method for automatic adjustment of work frequency |
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US20140008357A1 true US20140008357A1 (en) | 2014-01-09 |
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US13/934,022 Abandoned US20140008357A1 (en) | 2012-07-05 | 2013-07-02 | Microwave power source and method of automatic adjustement of operation frequence |
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US (1) | US20140008357A1 (en) |
EP (1) | EP2683219A3 (en) |
CN (1) | CN103533690A (en) |
Cited By (6)
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US20170045232A1 (en) * | 2014-04-24 | 2017-02-16 | Guangdong Midea Kitchen Appliances Manufacturing Co., Ltd. | Microwave oven |
US10126724B2 (en) | 2016-03-07 | 2018-11-13 | Haier Us Appliance Solutions, Inc. | Low power management system |
US10412988B2 (en) | 2013-03-11 | 2019-09-17 | Jacobsen Innovations, Inc. | Apparatus and system for roasting coffee beans |
US20200178360A1 (en) * | 2017-08-23 | 2020-06-04 | BSH Hausgeräte GmbH | Operating a domestic microwave appliance |
WO2020227028A1 (en) * | 2019-05-07 | 2020-11-12 | Lam Research Corporation | Closed-loop multiple-output radio frequency (rf) matching |
US10959575B2 (en) | 2013-03-11 | 2021-03-30 | Jacobsen Innovations, Inc. | Apparatus and method for roasting coffee beans |
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CN104180406A (en) * | 2014-09-10 | 2014-12-03 | 广东美的厨房电器制造有限公司 | Thawing method and system for microwave oven and microwave oven |
CN104535806B (en) * | 2014-10-31 | 2018-01-05 | 国家电网公司 | A kind of power amplifier automatic switching control equipment and system |
CN105142253B (en) * | 2015-07-24 | 2018-07-10 | 石铁峰 | A kind of microwave generating apparatus, microwave heating equipment and heating means |
CN105423363B (en) * | 2016-01-06 | 2018-03-16 | 广东美的厨房电器制造有限公司 | Microwave source system, micro-wave oven and the method performed in microwave source system |
CN105955095A (en) * | 2016-02-02 | 2016-09-21 | 广州莱肯信息科技有限公司 | Microwave frequency sweep source |
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CN106255251B (en) * | 2016-08-31 | 2022-11-18 | 广东美的厨房电器制造有限公司 | Microwave detection circuit and microwave oven comprising same |
CN106322453B (en) * | 2016-09-12 | 2018-06-08 | 广东美的厨房电器制造有限公司 | For the method for heating and controlling, heating control devices and micro-wave oven of micro-wave oven |
CN106234557A (en) * | 2016-10-10 | 2016-12-21 | 成都沃特塞恩电子技术有限公司 | A kind of radio frequency power source and radio frequency thawing apparatus |
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US20180323091A1 (en) * | 2017-05-03 | 2018-11-08 | Applied Materials, Inc. | Method and apparatus for uniform thermal distribution in a microwave cavity during semiconductor processing |
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4415789A (en) * | 1980-12-10 | 1983-11-15 | Matsushita Electric Industrial Co. Ltd. | Microwave oven having controllable frequency microwave power source |
US20120111856A1 (en) * | 2009-07-10 | 2012-05-10 | Panasonic Corporation | Microwave heating device and microwave heating control method |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2581842B2 (en) * | 1990-11-19 | 1997-02-12 | 動力炉・核燃料開発事業団 | Microwave heating equipment |
US6166362A (en) * | 1999-01-14 | 2000-12-26 | Samsung Electronics Co., Ltd. | Automatic cooking control method for a microwave oven |
US7863997B1 (en) * | 2007-06-22 | 2011-01-04 | The Ferrite Company, Inc. | Compact tuner for high power microwave source |
-
2012
- 2012-07-05 CN CN201210232055.6A patent/CN103533690A/en active Pending
-
2013
- 2013-05-28 EP EP13169425.9A patent/EP2683219A3/en not_active Withdrawn
- 2013-07-02 US US13/934,022 patent/US20140008357A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4415789A (en) * | 1980-12-10 | 1983-11-15 | Matsushita Electric Industrial Co. Ltd. | Microwave oven having controllable frequency microwave power source |
US20120111856A1 (en) * | 2009-07-10 | 2012-05-10 | Panasonic Corporation | Microwave heating device and microwave heating control method |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10412988B2 (en) | 2013-03-11 | 2019-09-17 | Jacobsen Innovations, Inc. | Apparatus and system for roasting coffee beans |
US10959575B2 (en) | 2013-03-11 | 2021-03-30 | Jacobsen Innovations, Inc. | Apparatus and method for roasting coffee beans |
US20170045232A1 (en) * | 2014-04-24 | 2017-02-16 | Guangdong Midea Kitchen Appliances Manufacturing Co., Ltd. | Microwave oven |
US10126724B2 (en) | 2016-03-07 | 2018-11-13 | Haier Us Appliance Solutions, Inc. | Low power management system |
US20200178360A1 (en) * | 2017-08-23 | 2020-06-04 | BSH Hausgeräte GmbH | Operating a domestic microwave appliance |
WO2020227028A1 (en) * | 2019-05-07 | 2020-11-12 | Lam Research Corporation | Closed-loop multiple-output radio frequency (rf) matching |
Also Published As
Publication number | Publication date |
---|---|
CN103533690A (en) | 2014-01-22 |
EP2683219A2 (en) | 2014-01-08 |
EP2683219A3 (en) | 2014-03-26 |
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