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WO2018120817A1 - Convertisseur de fréquence et four à micro-ondes - Google Patents

Convertisseur de fréquence et four à micro-ondes Download PDF

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Publication number
WO2018120817A1
WO2018120817A1 PCT/CN2017/094544 CN2017094544W WO2018120817A1 WO 2018120817 A1 WO2018120817 A1 WO 2018120817A1 CN 2017094544 W CN2017094544 W CN 2017094544W WO 2018120817 A1 WO2018120817 A1 WO 2018120817A1
Authority
WO
WIPO (PCT)
Prior art keywords
frequency converter
bobbin
unit
winding
rectifying unit
Prior art date
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.)
Ceased
Application number
PCT/CN2017/094544
Other languages
English (en)
Chinese (zh)
Inventor
覃承勇
黎青海
郑年重
艾军亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Midea Group Co Ltd
Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Original Assignee
Midea Group Co Ltd
Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from CN201621470707.XU external-priority patent/CN206302344U/zh
Priority claimed from CN201611246722.0A external-priority patent/CN106533184A/zh
Application filed by Midea Group Co Ltd, Guangdong Midea Kitchen Appliances Manufacturing Co Ltd filed Critical Midea Group Co Ltd
Priority to KR1020197018999A priority Critical patent/KR20190086561A/ko
Priority to JP2019542765A priority patent/JP6821045B2/ja
Publication of WO2018120817A1 publication Critical patent/WO2018120817A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC
    • H02M5/04—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters
    • H02M5/10—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using transformers
    • H02M5/16—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using transformers for conversion of frequency
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/303—Clamping coils, windings or parts thereof together
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0064—Magnetic structures combining different functions, e.g. storage, filtering or transformation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F2038/003—High frequency transformer for microwave oven

Definitions

  • the invention relates to the field of household appliances, and in particular to a frequency converter and a microwave oven.
  • the step-up transformer of the inverter of the microwave oven needs to reduce the magnetic coupling between the primary and secondary windings of the step-up transformer in order to obtain the required leakage inductance for resonance, which may result in energy transmission of the transformer.
  • the efficiency is reduced, and the overall temperature rise of the inverter is too high, which will reduce the reliability of the inverter operation and affect the service life of the inverter.
  • the present invention aims to at least solve one of the technical problems existing in the related art. To this end, the present invention needs to provide a frequency converter and a microwave oven.
  • the frequency converter of the embodiment of the present invention is used for a microwave oven, and the frequency converter includes an inverter switch unit, a step-up transformer, and a voltage doubler rectifying unit, and the inverter switch unit includes a switch tube, a resonant capacitor, and a resonant inductor, and the resonant capacitor is connected.
  • the step-up transformer includes a primary winding and a secondary winding, and one end of the primary winding is connected to one end of the resonant capacitor through the resonant inductor, the primary winding The other end of the line is connected to the other end of the resonant capacitor and the switch tube, and the secondary winding is connected to the voltage doubler rectifying unit.
  • the inverter switching unit is added, so that the resonant inductor can be separately provided from the step-up transformer, so that the resonant inductor does not affect the magnetic coupling between the primary winding and the secondary winding, and thus can be strengthened
  • the magnetic coupling capability of the primary winding and the secondary winding improves the energy transmission efficiency of the step-up transformer, thereby improving the overall efficiency of the frequency converter and ensuring the reliability of the operation of the frequency converter.
  • the step-up transformer includes a magnetic core assembly, a first bobbin and a second bobbin, the first bobbin and the second bobbin are hollow, and the primary winding is wound around the first The secondary winding Wrapped around the second bobbin, the second bobbin and the secondary winding are disposed in the first bobbin, the core assembly includes a first core and a second core, the A magnetic core includes a first post, and the second magnetic core includes a second post, the first post and the second post being disposed in the second bobbin and spaced apart.
  • the first bobbin includes two annular first retaining rings and a first frame connecting the two first retaining rings, and the primary winding is wound around the first frame.
  • the second bobbin includes two annular second retaining rings and a second frame connecting the two second retaining rings, and the secondary winding is wound around the second frame.
  • first frame body and the second frame body each have a hollow cylindrical shape, the first frame and the second frame are concentrically disposed, the length of the first frame and the The length of the second skeleton is equal.
  • the edge of the first retaining ring is provided with a first notch
  • the edge of the second retaining ring is provided with a second notch
  • the primary winding passes through the first notch
  • the second The grade winding passes through the second gap
  • the first core is U-shaped and the second core is U-shaped.
  • the resonant inductor includes a toroidal magnetic core and a winding that is evenly wound around the magnetic core, the winding being inserted into a circuit of the frequency converter.
  • the frequency converter includes a rectifying unit and an inverter control unit, the rectifying unit is connected in parallel with the inverter switching unit, and the rectifying unit is configured to convert alternating current into direct current, the inverter control unit It is connected in parallel with the inverter switch unit and is used for controlling the on and off of the switch tube.
  • the rectifying unit is connected to an alternating current power source, and the rectifying unit is configured to convert an alternating current of the alternating current power source into a direct current power.
  • the rectifying unit comprises a rectifier bridge.
  • the frequency converter includes a filtering unit that connects the rectifying unit and the inverter control unit.
  • the filtering unit includes an inductor and a capacitor, the inductor being in parallel with the capacitor.
  • a microwave oven according to an embodiment of the present invention includes a magnetron and a frequency converter according to any of the above embodiments, and the voltage doubler rectifying unit is connected to the magnetron.
  • the inverter switch unit is added, so that the resonant inductor can be disposed separately from the step-up transformer, so that the resonant inductor does not affect the magnetic coupling between the primary winding and the secondary winding, and thus the primary can be strengthened.
  • the magnetic coupling capability of the winding and the secondary winding improves the energy transmission efficiency of the step-up transformer, thereby improving the overall efficiency of the frequency converter and ensuring the reliability of the operation of the frequency converter.
  • FIG. 1 is a circuit diagram of a microwave oven according to an embodiment of the present invention.
  • FIG. 2 is a schematic perspective view of a step-up transformer of an inverter of a microwave oven according to an embodiment of the present invention.
  • FIG 3 is an exploded perspective view of a step-up transformer of an inverter of a microwave oven according to an embodiment of the present invention.
  • FIG. 4 is a perspective view showing a first skeleton and a second skeleton of a step-up transformer of an inverter of a microwave oven according to an embodiment of the present invention.
  • Fig. 5 is a plan view schematically showing a resonance inductance of a frequency converter of a microwave oven according to an embodiment of the present invention.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include one or more of the described features either explicitly or implicitly.
  • the meaning of "a plurality” is two or more unless specifically and specifically defined otherwise.
  • connection In the description of the present invention, it should be noted that the terms “installation”, “connected”, and “connected” are to be understood broadly, and may be fixed or detachable, for example, unless otherwise explicitly defined and defined. Connected, or connected in one piece. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, which can be the internal communication of two elements or the interaction of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
  • the frequency converter 10 is used in a microwave oven 100.
  • the frequency converter 10 includes an inverter switching unit 11, a step-up transformer 12, and a voltage doubler rectifying unit 13.
  • the inverter switch unit 11 includes a switch tube 111, a resonance capacitor 112, and a resonance inductor 113.
  • the resonant capacitor 112 is connected between the switching transistor 111 and the resonant inductor 113.
  • the step-up transformer 12 includes a primary winding 121 and a secondary winding 122.
  • One end of the primary winding 121 is connected to one end of the resonant capacitor 112 through a resonant inductor 113, and the other end of the primary winding 121 is connected to the other end of the resonant capacitor 112 and the switch 111.
  • the secondary winding 121 is connected to the voltage doubler rectifying unit 13.
  • the inverter switch unit 11 is added such that the resonant inductor 112 can be disposed separately from the step-up transformer 12, such that the resonant inductor 112 does not affect the relationship between the primary winding 121 and the secondary winding 122.
  • the magnetic coupling can further improve the energy transmission efficiency of the step-up transformer 12 by strengthening the magnetic coupling capability of the primary winding 121 and the secondary winding 122, thereby improving the overall efficiency of the inverter 10 and ensuring the reliability of the operation of the inverter 10. .
  • the resonant inductor 112 can be separately disposed from the step-up transformer 12, when the inverter 10 is in operation, the overall temperature rise of the inverter 10 is not high due to excessive leakage inductance, which reduces the total temperature.
  • the overall temperature rise of the frequency converter 10 ensures the safety of the frequency converter 10 for use.
  • the manner in which the resonant inductor 112 is disposed separately from the step-up transformer 12 simplifies the connection between the resonant inductor 112 and the step-up transformer 12 to a certain extent, so that the manufacturing cost of the inverter 10 can be reduced to some extent.
  • the step-up transformer 12 includes a core assembly 123, a first bobbin 124, and a second bobbin 125.
  • the first skeleton 124 and the second skeleton 125 are hollow.
  • the primary winding 121 is wound around the first skeleton 124.
  • the secondary winding 122 is wound around the second bobbin 125.
  • the second bobbin 125 and the secondary winding 122 are disposed in the first bobbin 124.
  • the magnetic core assembly 123 includes a first magnetic core 1231 and a second magnetic core 1232.
  • the first magnetic core 1231 includes a first pillar 1233.
  • the second magnetic core 1232 includes a second pillar 1234.
  • the first post 1233 and the second post 1234 are bored in the second bobbin 125 and are spaced apart from each other.
  • the magnetic coupling capability between the primary winding 121 and the secondary winding 122 is strong, and the first skeleton 124 can separate the primary winding 121 and the secondary winding 122, so that the primary winding 121 and the secondary can be effectively avoided.
  • the stage windings 122 interact with each other while the first core 1231 and the second core 1232 can be detachably connected, which facilitates assembly and disassembly of the core assembly 123.
  • the first frame 124 includes two annular first retaining rings 1241 and a first frame 1242 that connects the two first retaining rings 1241.
  • the primary winding 122 is wound around the first frame 1242.
  • the second skeleton 125 includes Two annular second retaining rings 1251 and a second frame 1252 connecting the two second retaining rings 1251.
  • the secondary winding 122 is wound around the second frame 1252.
  • the annular retaining ring has a certain protection function for the winding
  • the frame body has the functions of protection and support for the winding.
  • first frame 1242 and the second frame 1252 are both hollow cylindrical.
  • the first skeleton 124 and the second skeleton 125 are concentrically arranged.
  • the length of the first skeleton 124 is equal to the length of the second skeleton 125.
  • the windings can be evenly wound around the corresponding frame body, and the two skeletons are concentrically arranged to ensure strong magnetic coupling between the primary winding 121 and the secondary winding 122.
  • the first retaining ring 1241 is provided with a first notch 1243 at the edge thereof.
  • a second notch 1253 is defined in an edge of the second retaining ring 1251.
  • the primary winding 121 is provided with a first notch 1243.
  • the secondary winding 121 is provided with a second notch 1253.
  • the winding can be threaded and connected to the circuitry of the frequency converter 10.
  • the first core 1231 is U-shaped and the second core 1232 is U-shaped.
  • the distribution parameters of the magnetic core are consistent and have a good heat dissipation effect.
  • the resonant inductor 112 includes a toroidal core 114 and a winding 115 that is evenly wound around the core 114.
  • the winding 115 is connected to the circuit of the frequency converter 10.
  • the resonant flux 112 has less flux leakage, and does not interfere with the normal operation of the surrounding devices of the resonant inductor 112 due to the flux leakage, while the inductance of the resonant inductor 112 is stable because the process of the resonant inductor 112 is consistent in batch size. The possibility of poor sex is small.
  • the frequency converter 10 includes a rectification unit 14 and an inverter control unit 15.
  • the rectifying unit 14 is connected in parallel with the inverter switching unit 11.
  • the rectifying unit 14 is for converting alternating current into direct current.
  • the inverter control unit 15 is connected in parallel with the inverter switch unit 15 and is used to control the on and off of the switch tube 111.
  • the inverter control unit 15 can ensure the stability of the inverter switch unit 11, and can effectively ensure that the switching loss of the switch tube 111 is approximately zero.
  • the rectifying unit 14 is connected to an alternating current power source 17, and the rectifying unit 14 is for converting the alternating current of the alternating current power source 17 into direct current.
  • the rectifying unit 14 can include a rectifier bridge.
  • the frequency converter 10 includes a filtering unit 16.
  • the filtering unit 16 is connected to the rectifying unit 14 and the inverter control unit 15.
  • the filtering unit 16 includes an inductor 161 and a capacitor 162, and the inductor 161 is connected in parallel with the capacitor 162.
  • the microwave oven 100 of the embodiment of the present invention includes a magnetron 20 and a frequency converter 10 according to any of the above embodiments.
  • the voltage doubler rectifying unit 13 is connected to the magnetron 20.
  • the inverter switch unit 11 is added such that the resonant inductor 112 can be disposed separately from the step-up transformer 12 such that the resonant inductor 112 does not affect the magnetic field between the primary winding 121 and the secondary winding 122.
  • Coupling enhances the energy transfer efficiency of the step-up transformer 12 by enhancing the magnetic coupling capability of the primary winding 121 and the secondary winding 122, thereby improving the overall efficiency of the frequency converter 10 and ensuring the reliability of the operation of the frequency converter 10.
  • the first feature "on” or “under” the second feature may include direct contact of the first and second features, and may also include first and second features, unless otherwise specifically defined and defined. It is not in direct contact but through additional features between them.
  • the first feature "above”, “above” and “above” the second feature includes the first feature directly above and above the second feature, or merely indicating that the first feature level is higher than the second feature.
  • the first feature “below”, “below” and “below” the second feature includes the first feature directly below and below the second feature, or merely the first feature level being less than the second feature.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Dc-Dc Converters (AREA)
  • Inverter Devices (AREA)

Abstract

L'invention concerne un convertisseur de fréquence (10) et un four à micro-ondes (100). Le convertisseur de fréquence (10) comporte une unité de commutation d'inversion (11), un transformateur survolteur (12), et une unité de redressement de multiplication de tension (13). L'unité de commutation d'inversion (11) comporte un transistor de commutation (111), un condensateur à résonance (112) et une bobine d'induction de résonance (113). Le condensateur à résonance (112) est connecté entre le transistor de commutation (111) et la bobine d'induction de résonance (113). Le transformateur survolteur (12) comprend un enroulement primaire (121) et un enroulement secondaire (122), une extrémité de l'enroulement primaire (121) étant connectée à une extrémité du condensateur à résonance (112) au moyen de la bobine d'induction de résonance (113), et l'autre extrémité de l'enroulement primaire (121) étant connectée à l'autre extrémité du condensateur à résonance (112) et au transistor de commutation (111), l'enroulement secondaire (122) étant connecté à l'unité de redressement de multiplication de tension (13).
PCT/CN2017/094544 2016-12-29 2017-07-26 Convertisseur de fréquence et four à micro-ondes Ceased WO2018120817A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020197018999A KR20190086561A (ko) 2016-12-29 2017-07-26 주파수 변환기 및 전자 레인지
JP2019542765A JP6821045B2 (ja) 2016-12-29 2017-07-26 インバータおよび電子レンジ

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201621470707.X 2016-12-29
CN201621470707.XU CN206302344U (zh) 2016-12-29 2016-12-29 变频器及微波炉
CN201611246722.0 2016-12-29
CN201611246722.0A CN106533184A (zh) 2016-12-29 2016-12-29 变频器及微波炉

Publications (1)

Publication Number Publication Date
WO2018120817A1 true WO2018120817A1 (fr) 2018-07-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2017/094544 Ceased WO2018120817A1 (fr) 2016-12-29 2017-07-26 Convertisseur de fréquence et four à micro-ondes

Country Status (3)

Country Link
JP (1) JP6821045B2 (fr)
KR (1) KR20190086561A (fr)
WO (1) WO2018120817A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1368787A (zh) * 2001-02-09 2002-09-11 台达电子工业股份有限公司 Llc串联共振dc/dc变换器
JP2003109827A (ja) * 2001-09-28 2003-04-11 Matsushita Electric Ind Co Ltd 変成器及びそれを用いたマグネトロン駆動用電源
CN102340251A (zh) * 2010-07-20 2012-02-01 台达电子工业股份有限公司 交流-直流转换器及其控制电路
CN106533184A (zh) * 2016-12-29 2017-03-22 广东美的厨房电器制造有限公司 变频器及微波炉
CN206302344U (zh) * 2016-12-29 2017-07-04 广东美的厨房电器制造有限公司 变频器及微波炉

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0969448A (ja) * 1995-08-31 1997-03-11 Hitachi Ferrite Denshi Kk トランス
JP2010136489A (ja) * 2008-12-03 2010-06-17 Hasetekku:Kk 電力変換装置
TWI440054B (zh) * 2011-05-11 2014-06-01 Delta Electronics Inc 變壓器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1368787A (zh) * 2001-02-09 2002-09-11 台达电子工业股份有限公司 Llc串联共振dc/dc变换器
JP2003109827A (ja) * 2001-09-28 2003-04-11 Matsushita Electric Ind Co Ltd 変成器及びそれを用いたマグネトロン駆動用電源
CN102340251A (zh) * 2010-07-20 2012-02-01 台达电子工业股份有限公司 交流-直流转换器及其控制电路
CN106533184A (zh) * 2016-12-29 2017-03-22 广东美的厨房电器制造有限公司 变频器及微波炉
CN206302344U (zh) * 2016-12-29 2017-07-04 广东美的厨房电器制造有限公司 变频器及微波炉

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JP6821045B2 (ja) 2021-01-27
JP2019531693A (ja) 2019-10-31
KR20190086561A (ko) 2019-07-22

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