US20030189041A1 - Circuit for operating microwave oven - Google Patents

Circuit for operating microwave oven Download PDF

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Publication number
US20030189041A1
US20030189041A1 US10/406,254 US40625403A US2003189041A1 US 20030189041 A1 US20030189041 A1 US 20030189041A1 US 40625403 A US40625403 A US 40625403A US 2003189041 A1 US2003189041 A1 US 2003189041A1
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US
United States
Prior art keywords
switching
voltage
voltage source
circuit
switching devices
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.)
Abandoned
Application number
US10/406,254
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English (en)
Inventor
Wan Kim
Sung Han
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.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAN, SUNG JIN, KIM, WAN SOO
Publication of US20030189041A1 publication Critical patent/US20030189041A1/en
Priority to US11/043,148 priority Critical patent/US7034267B2/en
Abandoned legal-status Critical Current

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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
    • H05B6/80—Apparatus for specific applications
    • 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
    • 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
    • H05B6/681—Circuits comprising an inverter, a boost transformer and a magnetron
    • H05B6/682—Circuits comprising an inverter, a boost transformer and a magnetron wherein the switching control is based on measurements of electrical values of the circuit
    • H05B6/683—Circuits comprising an inverter, a boost transformer and a magnetron wherein the switching control is based on measurements of electrical values of the circuit the measurements being made at the high voltage side of the circuit
    • 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

Definitions

  • the present invention relates to a circuit for operating a microwave oven, and more particularly, to an inverter circuit which can operate a microwave oven by using a DC voltage.
  • Such an inverter operating system is applied to the microwave oven, too.
  • the microwave oven heats an object by directing microwave generated from a current to the object.
  • an inverter operating system of control is employed for generation of the microwave.
  • FIG. 1 illustrates a related art circuit for operating a microwave oven.
  • a related art inverter circuit for operating a microwave oven is provided with a rectifying circuit 15 for rectifying an AC current from an AC power source 10 , which rectified current is provided to a primary side of a transformer through the inductor 20 .
  • a magnetron 40 on a secondary side of the transformer 25 for generating microwave. That is, the magnetron 40 is operative from the voltage induced at the secondary side of the transformer 25 for generating the microwave.
  • a primary side voltage of the transformer 25 is controlled by a power switching part 30 .
  • the power switching part 30 is turned on/off in response to a PWM control signal generated at an inverter operating part 55 based on an output control signal from the microcomputer 35 , to control a primary supply voltage of the transformer 25 .
  • a current to the magnetron 40 is detected at a current transformer 45 , rectified at a rectifying circuit 50 , and forwarded.
  • a signal of a current intensity to the magnetron 40 detected at the current transformer 45 is provided to the microcomputer 35 .
  • an anode of the magnetron 40 has no current, but a high voltage provided thereto from the transformer 25 , until a heater in the magnetron 40 is heated enough to emit thermal electrons.
  • This state is a non-oscillation region of the magnetron 40 , and it takes a certain time period (about 2 seconds) until the heater in the magnetron 40 makes a regular emission of the thermal electrons enough to generate the microwave.
  • the current intensity to the magnetron 40 is in correspondence to a microwave output, such that if the current intensity is high, the microwave output is high, and if the current intensity is low, the microwave output is low.
  • the current intensity detected at the current transformer 45 is used for controlling the microwave output as the current intensity is provided to the microcomputer 35 to control the current intensity to the magnetron 40 .
  • the related art circuit for operating a microwave oven has the following problems.
  • the present invention is directed to a circuit for operating a microwave oven that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
  • An object of the present invention is to provide a circuit for operating a microwave oven in which the microwave oven is controlled by using a DC power such as a power source for a car.
  • the circuit for operating a microwave oven includes a DC voltage source, a switching part having at least two switching devices electrically connected to the DC voltage source for switching a voltage from the DC voltage source, a controlling part for controlling the switching part, a magnetron for generating a microwave, and a converting part for converting the voltage from the DC voltage source to a voltage for operating the magnetron by switching of the switching part.
  • the DC voltage source is a car battery source.
  • the switching part includes two or four switching devices.
  • the switching device includes a bipolar transistor and a diode connected in parallel to each other.
  • the switching devices each having the bipolar transistor and the diode are connected in parallel.
  • the switching device includes an MOSFET, a diode and a capacitor connected in parallel.
  • the switching devices each having the MOSFET, the diode and the capacitor form a serial resonant half-wave voltage doubler rectifier circuit or a serial resonant full wave rectifier circuit.
  • a circuit for operating a microwave oven including a DC voltage source, a first switching device connected to the DC voltage source in series for switching a voltage from the DC voltage source, a second switching device connected to the first switching device in parallel for switching the voltage from the DC voltage source, a controlling part for controlling the first, and second switching devices, a magnetron for generating a microwave, and a converting part connected between the DC voltage source and a node between the first and second switching devices for converting the voltage from the DC voltage source to a voltage for operating the magnetron by switching of the first and second switching devices.
  • Each of the first, and second switching devices includes a bipolar transistor and a diode connected in parallel to each other.
  • a circuit for operating a microwave oven including a DC voltage source, first and second switching devices connected to the DC voltage source in series for switching a voltage from the DC voltage source, a controlling part for controlling the first, and second switching devices, a magnetron for generating a microwave, and a converting part connected between the DC voltage source and a node between the first and second switching devices for converting the voltage from the DC voltage source to a voltage for operating the magnetron by switching of the first and second switching devices.
  • Each of the first, and second switching devices includes an MOSFET, a diode and a capacitor connected in parallel to one another.
  • a circuit for operating a microwave oven including a DC voltage source, first and second switching devices connected to the DC voltage source in series for switching a voltage from the DC voltage source, third and fourth switching devices connected to the first and second switching devices in parallel for switching the voltage from the DC voltage source, a controlling part for controlling the first, second, third and fourth switching devices, a magnetron for generating a microwave, and a converting part connected between a first node between the first and second switching device and a second node between the third and fourth switching devices for converting the voltage from the DC voltage source to a voltage for operating the magnetron by switching of the first, second, third and fourth switching devices.
  • Each of the first, second, third and fourth switching devices includes an MOSFET, a diode and a capacitor connected in parallel to one another.
  • FIG. 1 illustrates a circuit diagram for describing a related art circuit for operating a microwave oven
  • FIGS. 2 to 4 illustrate circuit diagrams each for describing a circuit for operating a microwave oven in accordance with one of different preferred embodiments of the present invention.
  • FIGS. 2 to 4 illustrate circuit diagrams each for describing a circuit for operating a microwave oven in accordance with one of different preferred embodiments of the present invention.
  • the circuit for operating a microwave oven in accordance with a preferred embodiment of the present invention is provided with a DC voltage source DC, for an example, a car battery which is used widely, for cooking food in outdoor by using the microwave oven.
  • DC for an example, a car battery which is used widely, for cooking food in outdoor by using the microwave oven.
  • the circuit for operating a microwave oven in accordance with a preferred embodiment of the present invention includes a switching part 100 having at least two electrically connected switching, devices S 1 and S 2 for switching a voltage from the DC voltage source DC, a controlling part 110 for controlling the switching devices S 1 and S 2 , a magnetron 130 for generating a microwave, a converting part 120 for converting, the voltage into a voltage or operating the magnetron 130 by turning, on/off of the switching part 100 .
  • the embodiment shown in FIG. 2 includes the DC voltage source DC.
  • the first switching device S 1 connected to the DC voltage source in series for switching the voltage of the DC voltage source
  • the second switching device S 1 connected to the first switching device S 1 in parallel for switching, the voltage of the DC voltage source
  • the controlling part 110 for controlling the first and second switching devices S 1 and S 2
  • the magnetron 130 for generating the microwave
  • the converting part 120 connected to the DC voltage source and a node between the first and second switching devices S 1 and S 2 for converting the voltage from the DC voltage source to a voltage which can operate the magnetron according to switching of the first and second switching devices S 1 and S 2 .
  • the first and second switching devices S 1 and S 2 are a bipolar transistor and a diode respectively connected in parallel.
  • the converting part 120 a transformer, is connected to the anode of the DC voltage source.
  • the controlling part 110 includes an inverter operating part and a microcomputer, so that the switching devices S 1 and S 2 are turned on/off in response to control signals provided from the inverter operating part based on an output control signal from the microcomputer, for controlling the primary side supply voltage of the converter 120 .
  • the DC voltage source voltage DC is made to be provided to the primary side of the converting part 120 as a pulsating voltage through the rectifying circuit (not shown).
  • the pulsating voltage is turned into an alternating voltage by switching of the switching part 100 before being provided to the primary side of the converting part 120 . Since an intensity of the current i switched is as high as about 139 A, the present invention formulates the switching part 100 with the two switching devices.
  • the secondary side of the converting part 120 is converted into a voltage range enough to operate the magnetron 130 in proportion of a number of windings, and to make the magnetron 130 to generate the microwave.
  • the current to the magnetron 130 is detected by the current transformer 140 , and the detected current is converted through the rectifying circuit 150 before being forwarded.
  • a signal of an intensity of the current to the magnetron 130 detected at the current transformer 140 is provided to the microcomputer in the controlling part 110 .
  • the current intensity detected at the current transformer 140 is provided to the microcomputer for controlling the current intensity to the magnetron, to control microwave output.
  • the present invention operative thus can operate a microwave oven by using a power source, such as a car battery, food can be cooked even in outdoor conveniently.
  • FIG. 3 illustrates a circuit diagram for describing another preferred embodiment of the present invention, wherein parts the same with FIG. 2 will be represented with the same reference symbols.
  • the two switching devices S 1 and S 2 of the switching part 100 are provided in serial resonant half-wave rectification circuits each inclusive of an MOSFET transistor, a diode, and a capacitor connected in parallel.
  • the embodiment in FIG. 3 includes the DC voltage source DC, first, and second switching devices S 1 and S 2 connected to the DC voltage source in series for switching a voltage provided from the DC voltage source, a controlling part 110 for controlling the first and second switching devices S 1 and S 2 , a magnetron 30 for generating a microwave, and a converting part 120 connected to the DC voltage source and a node between the first and second switching devices S 1 and S 2 for converting the voltage from the DC voltage source to a voltage which can operate the magnetron according to switching of the first and second switching devices S 1 and S 2 .
  • Each of the first and second switching devices S 1 and S 2 includes an MOSFET Transistor, a diode, and a capacitor connected in parallel.
  • the converting part 120 connected to the DC voltage source is connected to a cathode of the DC voltage source.
  • the MOSFET transistor Since the embodiment of FIG. 3 has a current to the switching device S 1 or S 2 as high as approx, 118 A, the MOSFET transistor is employed, which has excellent current handling capability and switching speed.
  • FIG. 4 illustrates a circuit diagram for describing a circuit for operating a microwave oven in accordance with another preferred embodiment of the present invention.
  • the embodiment in FIG. 4 includes the DC voltage source DC, first, and second switching devices S 1 and S 2 connected to the DC voltage source in series for switching a voltage provided from the DC voltage source, third, and fourth switching devices S 3 and S 4 connected to first, and second switching devices S 1 and S 2 in parallel for switching a voltage provided from the DC voltage source, a controlling part 110 for respectively controlling the first second, third and fourth switching devices S 1 , S 2 , S 3 and S 4 , a magnetron 130 for generating a microwave, and a converting part 120 connected to a first node between the first and second switching n devices S 1 and S 2 and a second node between the third and fourth switching devices S 3 and S 4 lot converting the voltage from the DC voltage source to a voltage which can operate the magnetron according to switching of the first, second, third, and fourth switching devices S 1 , S 2 , S 3 and S 4 .
  • Each of first, second, third, and fourth switching devices S 1 , S 2 , S 3 and S 4 includes an MOSFET transistor, a diode and a capacitor connected in parallel.
  • FIG. 4 Since the embodiment of FIG. 4 has a current to the switching device S 1 , S 2 , S 3 or S 4 as high as approx. 59A, alike the case of FIG. 3, the MOSFET transistor is employed, which has excellent current handling capability and switching speed.
  • the circuit for operating a microwave oven of the present invention has the following advantages.
  • the operating circuit which can generate a microwave energy from a magnetron by using DC power source, such as car battery which is used widely, permits convenient outdoor cooking of food as well as convenient cooking of food in a black out, by using a car battery.
  • DC power source such as car battery which is used widely

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
US10/406,254 2002-04-04 2003-04-04 Circuit for operating microwave oven Abandoned US20030189041A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/043,148 US7034267B2 (en) 2002-04-04 2005-01-27 DC voltage microwave oven power supplying circuit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR2002-0018619 2002-04-04
KR1020020018619A KR20030079546A (ko) 2002-04-04 2002-04-04 전자레인지 구동회로

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/043,148 Division US7034267B2 (en) 2002-04-04 2005-01-27 DC voltage microwave oven power supplying circuit

Publications (1)

Publication Number Publication Date
US20030189041A1 true US20030189041A1 (en) 2003-10-09

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US10/406,254 Abandoned US20030189041A1 (en) 2002-04-04 2003-04-04 Circuit for operating microwave oven
US11/043,148 Expired - Fee Related US7034267B2 (en) 2002-04-04 2005-01-27 DC voltage microwave oven power supplying circuit

Family Applications After (1)

Application Number Title Priority Date Filing Date
US11/043,148 Expired - Fee Related US7034267B2 (en) 2002-04-04 2005-01-27 DC voltage microwave oven power supplying circuit

Country Status (5)

Country Link
US (2) US20030189041A1 (zh)
EP (1) EP1351556A3 (zh)
JP (1) JP2003303676A (zh)
KR (1) KR20030079546A (zh)
CN (1) CN1225148C (zh)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100598408B1 (ko) 2004-11-23 2006-07-10 삼성전자주식회사 차량용 전자렌지
US10687391B2 (en) 2004-12-03 2020-06-16 Pressco Ip Llc Method and system for digital narrowband, wavelength specific cooking, curing, food preparation, and processing
JP4479511B2 (ja) * 2005-01-18 2010-06-09 パナソニック株式会社 高周波加熱装置
IT1395001B1 (it) * 2009-06-19 2012-08-07 Massa Alimentatore per magnetron a duplicatore di tensione a potenza regolabile
JP2011060566A (ja) * 2009-09-10 2011-03-24 Panasonic Corp 高周波加熱装置
CN104936327B (zh) * 2015-07-08 2016-08-24 王春芳 一种微波炉用磁控管电源功率传输与控制方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4860184A (en) * 1987-09-23 1989-08-22 Virginia Tech Intellectual Properties, Inc. Half-bridge zero-voltage switched multi-resonant converters
US5010468A (en) * 1984-12-10 1991-04-23 Nilssen Ole K Power-line-operated high frequency power supply
US5115168A (en) * 1987-07-28 1992-05-19 Mitsubishi Denki Kabushiki Kaisha Power supply for microwave discharge light source
US5181160A (en) * 1990-07-26 1993-01-19 Sharp Kabushiki Kaisha Driving circuit for inverter microwave oven
US5237140A (en) * 1990-05-25 1993-08-17 Sawafuji Electric Co., Ltd. a-c/d-c microwave oven
US5977530A (en) * 1997-02-25 1999-11-02 Matsushita Electric Industrial Co., Ltd Switching power supply for high frequency heating apparatus
US6097614A (en) * 1999-05-14 2000-08-01 Astec International Limited Asymmetrical pulse width modulated resonant DC-DC converter with compensating circuitry
US6483724B1 (en) * 2002-02-15 2002-11-19 Valere Power, Inc. DC/DC ZVS full bridge converter power supply method and apparatus

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5321235A (en) * 1991-06-04 1994-06-14 Sanyo Electric Co., Ltd. Half-bridge converter switching power supply for magnetron
FR2696292B1 (fr) 1992-09-25 1994-12-23 Moulinex Sa Dispositif d'alimentation d'une charge unidirectionnelle telle qu'un magnétron.
AU753821B2 (en) * 1998-08-06 2002-10-31 Matsushita Electric Industrial Co., Ltd. High frequency heating apparatus
JP3233138B2 (ja) * 1999-09-27 2001-11-26 松下電器産業株式会社 インバータ回路
DE60109504T2 (de) * 2000-01-28 2006-03-16 Densei-Lambda K.K. Resonanter Leistungsumwandler

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5010468A (en) * 1984-12-10 1991-04-23 Nilssen Ole K Power-line-operated high frequency power supply
US5115168A (en) * 1987-07-28 1992-05-19 Mitsubishi Denki Kabushiki Kaisha Power supply for microwave discharge light source
US4860184A (en) * 1987-09-23 1989-08-22 Virginia Tech Intellectual Properties, Inc. Half-bridge zero-voltage switched multi-resonant converters
US5237140A (en) * 1990-05-25 1993-08-17 Sawafuji Electric Co., Ltd. a-c/d-c microwave oven
US5181160A (en) * 1990-07-26 1993-01-19 Sharp Kabushiki Kaisha Driving circuit for inverter microwave oven
US5977530A (en) * 1997-02-25 1999-11-02 Matsushita Electric Industrial Co., Ltd Switching power supply for high frequency heating apparatus
US6097614A (en) * 1999-05-14 2000-08-01 Astec International Limited Asymmetrical pulse width modulated resonant DC-DC converter with compensating circuitry
US6483724B1 (en) * 2002-02-15 2002-11-19 Valere Power, Inc. DC/DC ZVS full bridge converter power supply method and apparatus

Also Published As

Publication number Publication date
KR20030079546A (ko) 2003-10-10
EP1351556A3 (en) 2004-01-28
CN1225148C (zh) 2005-10-26
US20050121443A1 (en) 2005-06-09
US7034267B2 (en) 2006-04-25
EP1351556A2 (en) 2003-10-08
CN1449225A (zh) 2003-10-15
JP2003303676A (ja) 2003-10-24

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Owner name: LG ELECTRONICS INC., KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KIM, WAN SOO;HAN, SUNG JIN;REEL/FRAME:013937/0340

Effective date: 20030313

STCB Information on status: application discontinuation

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