CN101737827B - Double frequency conversion microwave oven having function of shimming fields - Google Patents
Double frequency conversion microwave oven having function of shimming fields Download PDFInfo
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- CN101737827B CN101737827B CN2009101131343A CN200910113134A CN101737827B CN 101737827 B CN101737827 B CN 101737827B CN 2009101131343 A CN2009101131343 A CN 2009101131343A CN 200910113134 A CN200910113134 A CN 200910113134A CN 101737827 B CN101737827 B CN 101737827B
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Abstract
The invention provides a double frequency conversion microwave oven having a function of shimming fields, and relates to a microwave oven, which can uniformly distribute electromagnetic fields and microwave power in a heating cavity, can evenly heat a heated object, and can obviously improve the heating quality and heating speed. The double frequency conversion microwave oven is provided with an oven body, a magnetron and a magnetron driver, wherein the oven body is provided with the heating cavity and a circuit device assembling cavity; the magnetron and the magnetron driver are arranged in the circuit device assembling cavity; the magnetron driver is provided with a frequency converter, a high-frequency transformer, a magnetron frequency regulating module and a magnetron power stabilizing module; the input end of the frequency converter is connected with mains electricity low-frequency AC current, and the output end of the frequency converter is connected with the input end of the high-frequency transformer; the output end of the high-frequency transformer is connected with the input end of the magnetron frequency regulating module and the input end of the magnetron power stabilizing module; and the output end of the magnetron frequency regulating module and the output end of the magnetron power stabilizing module are connected with the input end of the magnetron respectively.
Description
Technical field
The present invention relates to a kind of micro-wave oven, especially relate to a kind of two variable frequency microwave stoves that have frequency converter and magnetron variable frequency drives with shimming functions.
Background technology
The application of micro-wave oven is more and more universal, when micro-wave oven has plurality of advantages, also has a lot of defectives.In recent years, more and more to the research that how to overcome micro-wave oven defective aspect.Micro-wave oven heats the inhomogeneities that obvious defects is exactly heating.Be used for alleviating the uneven measure of micro-wave oven heating at present and mainly contain two kinds: a kind of is the food service tray that is provided with in the microwave oven heating cavity bottom by the driven by motor rotation; Another kind is the metal agitator that is provided with in the furnace chamber heating chamber by the driven by motor rotation.These two kinds of methods not only can increase material and device cost, and because motor and motor power-supply wire are introduced heating chamber, can increase the leakage of microwave, cause electromagnetic pollution, are unfavorable for environmental protection.
The effect of the driven by magnetron device of traditional frequency conversion micro-wave oven is to convert the civil power alternating current to high voltage direct current, in order to drive magnetron work.Magnetron is worked under the driven by magnetron device drives, and produces microwave.Microwave sends in the heating chamber through an antenna.A food service tray or an agitator that driven by motor is arranged in the heating chamber.Food in the heating chamber is heated under the effect of microwave.Microwave forms standing wave in heating chamber, because the electromagnetic field skewness, so the inhomogeneities of food heating is clearly.The motion of the food service tray of driven by motor or agitator, it is uneven to alleviate heating in the horizontal direction, but on the vertical direction, and it is inhomogeneous to remain heating, and because the introducing of motor and motor power-supply wire, can increase the microwave leakage of heating chamber.
Publication number is that the application for a patent for invention of CN101217836A discloses a kind of can rapidly the even concentrated area of microwave energy being captured to the heating thing, utilize the cylindrical resonance of microwave ceramics, to improve the efficiency of heating surface of microwave, reduce heat time heating time, heating load and microwave source reach optimum Match, and back wave goes to zero, can prolong the life-span of magnetron, reduce the leakage of microwave energy, reduce electromagnetic pollution, this application for a patent for invention mainly is the nonstorage calorifier based on energy capture of microwave that is used for micro-wave oven.
Publication number is the dispersing apparatus of microwave that the application for a patent for invention of CN 1212349A discloses a kind of micro-wave oven, comprising: electric rotating machine is installed on first waveguide; First and second belt pulleys are installed on first and second waveguides, rotate with driving electric rotating machine; A driving-belt is arranged between first and second belt pulleys, so that two belt pulleys can rotate simultaneously; First and second feeders are by the first and second belt pulley driven rotary of rotation; And first and second rotable antennas, rotatably install, along with antenna drives rotation prejudicially by the power of first and second feeders, in order to by first and second waveguides equably with microwave scattering in cooking room.
Publication number is that the application for a patent for invention of CN100401855C discloses a kind of changeable frequency type variable frequency microwave stove and control method thereof.This changeable frequency type variable frequency microwave stove comprises: magnetron is used to produce electron waves; The direct current splenium is used for the industrial AC power rectification as the frequency converter driving power is dc source and makes it level and smooth; Switch portion is utilized the dc source that applies from aforementioned DC voltage portion, makes a plurality of switch elements carry out switch and produces an alternating voltage that is used to drive the magnetron that produces electron waves; With frequency conversion portion, based on the size through the rectification of aforementioned direct current splenium and the sliding dc source that flattens, the operating frequency of aforementioned switches portion is variable, and the alternating voltage of exporting from aforementioned switch portion can keep steady state value; Driven by magnetron voltage portion is the AC voltage conversion from aforementioned switch portion output the DC voltage of high output, is delivered to aforementioned magnetron.Compare with variable frequency microwave stove in the past, improved the action of frequency converter, prolonged the time that keeps driving magnetron, the efficiency of heating surface and the reliable in action of micro-wave oven all are improved.
Publication number is that the application for a patent for invention of CN1171039C discloses a kind of micro-wave oven device for homogenous heating, comprising: in order to produce the magnetron of microwave; One guiding magnetron produces the waveguide assembly of microwave; The opening of the microwave of a pair of form radiating guide device guiding with circular polarized wave; And one constitute polyhedron and the chamber of non-rectangle, wherein constitutes this polyhedral more than one inwall and tilt except that the right angle at a predetermined angle with respect to adjacent inner wall.Adopt this structure, the microwave that magnetron produces is by waveguide assembly and opening during by radiation, and the tilt internal wall by the chamber is reflected in the chamber and sends food to, thereby guarantees that microwave evenly distributes on whole food, and makes food obtain even cooking.
Publication number provides the method for a kind of frequency converter micro-wave oven and this micro-wave oven of control for the application for a patent for invention of CN101217836A, wherein during the micro-wave oven initialization, improve the inversion frequency of a frequency converter, behind a preset time, reducing this inversion frequency in the micro-wave oven normal work period, thereby prevented from during the initialization overvoltage is being applied on the magnetron that generates electromagnetic waves, therefore improved the durability and the functional reliability of this frequency converter.
Summary of the invention
The objective of the invention is at the uneven problem of heating in the existing micro-wave oven, a kind of electromagnetic field and microwave power distribution uniform that can make in the heating chamber is provided, it is more even that heating object is heated, and can realize obviously improving the two variable frequency microwave stoves with shimming functions of heating quality and speed.
The present invention is provided with body of heater, magnetron and driven by magnetron device, and body of heater is provided with heating chamber and circuit arrangement installation cavity, and magnetron and driven by magnetron device are located in the circuit arrangement installation cavity; The driven by magnetron device is provided with frequency converter, high frequency transformer, magnetron frequency adjustment module and magnetron power stability module, frequency converter input termination civil power low frequency ac, inverter output terminal connects the high frequency transformer input, the high frequency transformer output connects magnetron frequency adjustment module input and magnetron power stability module input respectively, and magnetron frequency adjustment module output and magnetron power stability module output connect the magnetron input respectively.
Described frequency converter is used for the civil power low frequency ac is converted into high-frequency alternating current.
Described high frequency transformer is used for the high-frequency alternating current of frequency converter output is converted into magnetron frequency adjustment module and magnetron power stability module required voltage, the high frequency transformer output is provided with three ports, wherein the turn ratio of the primary coil of first port and secondary coil is preferably 1: 2, the primary coil of second port and the turn ratio of secondary coil are preferably 1: 10, and the primary coil of the 3rd port and the turn ratio of secondary coil are preferably 20: 1.
Described magnetron frequency adjustment module is provided with rectification module, the pre-filtering module, switch block, the post-filtering module, photoelectric isolation module, microcomputer and voltage-doubler rectification filtration module, first port of rectification module input termination high frequency transformer output, the output termination pre-filtering module input of rectification module, pre-filtering module output termination switch block input, switch block output termination post-filtering module input, post-filtering module output termination magnetron input, photoelectric isolation module is located between microcomputer output and the switch block input, second port of voltage-doubler rectification filtration module input termination high frequency transformer output, voltage-doubler rectification filtration module output termination post-filtering module output.Described rectification module can adopt full-wave bridge rectifier circuit, the pre-filtering module is made of electric capacity, switch block is made of 1 switch triode and 2 biasing resistors, the post-filtering module is the low pass filter that inductance and electric capacity are formed, and photoelectric isolation module is made of 1 photoelectric coupled device and 1 current-limiting resistance.
Described magnetron power stability module is provided with rectification module, filtration module and current source module, the 3rd port of rectification module input termination high frequency transformer output, rectification module output termination filtration module input, filtration module output termination current source module input, current source module input termination magnetron cathode filament, the plus earth of magnetron.Described rectification module is the full-wave rectification bridge that 4 diodes are formed.Described filtration module is made of electric capacity, and described current source module is adjustable resistance and 3 mirror current sources that triode is formed, and the big I of its output current decides by the resistance size of adjustable resistance.
When the present invention uses, magnetron frequency adjustment module and magnetron power stability module are used to produce the voltage that drives magnetron frequency conversion work, make the frequency of magnetron at the change output microwave of the bandwidth range intercycle of setting, and the power output of while stabilized magnetron.Compare with traditional variable frequency microwave stove, because the driven by magnetron device of traditional variable frequency microwave stove is made up of frequency converter, high frequency transformer and AC-DC conversion module, frequency converter just changes the power work frequency, can only reach and raise the efficiency and purpose of energy saving, but do not change the frequency of magnetron output microwave, be that magnetron output microwave is the frequency of fixing, so the microwave distribution is changeless stationary field in the heating chamber, causes heating inhomogeneous.And driven by magnetron device of the present invention is provided with magnetron frequency adjustment module and magnetron power stability module, therefore can be in the stabilized magnetron power output, automatically change the microwave frequency of magnetron output, it no longer is changeless stationary field that the interior microwave of heating chamber is distributed, microwave distributes and can constantly change with the change of frequency, electromagnetic field in the heating chamber is evenly distributed, microwave power is evenly distributed, thereby the heating object each several part is heated evenly, the quality of heating and speed all are improved significantly.
This shows that the present invention not only can improve the uniformity of microwave oven heating cavity electromagnetic field distribution and improve the uniformity of heating using microwave, improves the quality of heating; And can carry out high-power Fast Heating and can not produce that part is burnt, situation that part is not yet done or uneven in temperature, can significantly shorten heating time, improve the speed of heating.When the high-power shelves of this external use micro-wave oven thaw frozen food, the situation that part is not thawed, part is ripe can not occur, can improve the quality and the speed of thawing.
Description of drawings
Fig. 1 is that the structure of the embodiment of the invention is formed schematic diagram.
Fig. 2 is the structure composition frame chart of driven by magnetron device among Fig. 1.
Fig. 3 is the traditional structure composition frame chart of driven by magnetron device.
Fig. 4 is the structure composition frame chart of magnetron frequency adjustment module among Fig. 4.
Fig. 5 is the structure composition frame chart of magnetron power stability module among Fig. 3.
Fig. 6 is the magnetron and the driven by magnetron device circuit theory diagrams of the embodiment of the invention.
Fig. 7 is the coherent signal oscillogram of the embodiment of the invention.In Fig. 7, Fig. 7 a is the signal waveforms of microcomputer port output, and this signal waveforms is the square-wave signal that changes in the linear in time cycle of a fixed-frequency, dutycycle; Fig. 7 b is under the control of 7a square-wave signal, and change along with the change in duty cycle of square-wave signal the switch time of Q1, after the filtering through inductance L 1 and capacitor C 2, and the voltage waveform that on capacitor C 2, forms; Abscissa t is the time, ordinate V
aBe voltage; 7c is carried in the anode of magnetron M1 and the voltage oscillogram between the negative electrode, and abscissa t is the time, ordinate V
bBe voltage; Fig. 7 d be magnetron M1 under the effect of voltage shown in Fig. 7 c, the microwave frequency time history plot of output, abscissa t are the time, ordinate f is a frequency.
The specific embodiment
The invention will be further described in conjunction with the accompanying drawings for following examples.
Referring to Fig. 1 and 2, the present invention is provided with body of heater 1, magnetron M1 and driven by magnetron device 2.Body of heater 1 is provided with heating chamber 11 and installation cavity 12, and magnetron M1 and driven by magnetron device 2 are located in the installation cavity 12.The driven by magnetron device is provided with frequency converter 21, high frequency transformer 22, magnetron frequency adjustment module 23 and magnetron power stability module 24.Frequency converter 21 input termination civil power low-frequency ac power P are (as being 220V, 50Hz).Frequency converter 21 output termination high frequency transformers 22 inputs.High frequency transformer 22 outputs connect magnetron frequency adjustment module 23 inputs and magnetron power stability module 24 inputs respectively.Magnetron frequency adjustment module 23 outputs and magnetron power stability module 24 outputs all connect magnetron M1 input.Described frequency converter 21 is used for the civil power low frequency ac is converted into high-frequency alternating current; Described high frequency transformer 22 is used for the high-frequency alternating current of frequency converter 21 outputs is converted into magnetron frequency adjustment module 23 and magnetron power stability module 24 required voltages.Described magnetron frequency adjustment module 23 and magnetron power stability module 24 are used to produce the voltage that drives magnetron M1 frequency conversion work, make the frequency of magnetron M1 at the change output microwave of the bandwidth range intercycle of setting, and the power output of while stabilized magnetron M1.Wherein high frequency transformer 22 outputs are provided with three ports.
Referring to Fig. 3, driven by magnetron device 2 ' traditional structure be provided with frequency converter 21 ', high frequency transformer 22 ' and AC-DC conversion module 7.
Referring to Fig. 4, magnetron frequency adjustment module 23 is provided with rectification module 231, pre-filtering module 232, switch block 233, post-filtering module 236, photoelectric isolation module 234, microcomputer 235 and voltage-doubler rectification filtration module 237.Rectification module 231 and pre-filtering module 232 are used for the high-frequency alternating current of high frequency transformer 21 outputs first port output is handled through rectifying and wave-filtering, obtain direct current level and smooth about 400V.It is about 100Hz that microcomputer 235 is used to produce a frequency, the square wave control signal of dutycycle linear period variation between 0～100%.Photoelectric isolation module 234 is used to realize that the electricity between microcomputer 235 and the switch block 233 isolates, and is used to prevent that the momentary pulse curtage of switch block 233 is added to the output port of microcomputer 235 and damages computer.Switch block 233 is used for doing the action of break-make under the square-wave signal control that microcomputer 235 produces, can produce at switch block 233 outputs to have the alternating voltage that DC component constantly changes with switch block 233 make-and-break time ratios.Post-filtering module 236 is used for the AC compounent of the alternating current of filtering switch block 233 outputs, obtains the DC voltage that a size periodically slowly changes in time.Voltage-doubler rectification filtration module 237 is used for alternating current voltage-doubler rectification and the filtering with high frequency transformer 21 outputs second port, obtains the DC voltage of a voltage about 4000V.Voltage-doubler rectification filtration module 237 superposes with the voltage that post-filtering module 236 produces, obtain 1 on the 4000V DC component stack amplitude be the triangle wave voltage of the triangle wave voltage of 400V, triangle wave voltage is loaded between the anode and negative electrode of magnetron M1, drive magnetron M1 work, microwave frequency cyclically-varying of magnetron M1 output with the cyclically-varying of triangle wave voltage amplitude.
Referring to Fig. 5, magnetron power stability module 24 contains rectification module 241, filtration module 242 and current source module 243.Rectification module 241 and filtration module 242 are used for the AC rectification filtering with high frequency transformer output port 3, obtain level and smooth direct current.Current source module 243 produces the constant electric current of numerical value with the DC voltage of filtration module 242 outputs, is loaded on the cathode filament of magnetron M1, drives magnetron M1 work, and makes magnetron M1 stably export microwave power.
Referring to Fig. 6, be present embodiment circuit arrangement schematic diagram.The external civil power alternating current of the input of frequency converter 21 P, the input port of the output termination high frequency transformer of frequency converter 21.High frequency transformer is made of transformer T1, T1 is provided with an input port, three output ports, the primary coil of three output ports and the turn ratio of secondary coil are respectively: 1: 2,1: 10 and 20: 1, first output port links to each other with rectification module 231, second output port links to each other with voltage-doubler rectification filtration module 237, and the 3rd output port links to each other with rectification module 241.Rectification module 231 is formed full-wave rectification bridge B1 by 4 diodes and is constituted.Pre-filtering module 232 is made of capacitor C 1.Switch block 233 is made of 1 switch triode Q1 and resistance R 2, R3 and R5, and wherein R2 and R3 are the biasing resistors of Q1, and R5 is a divider resistance.Photoelectric isolation module 234 is made of 1 photoelectric coupled device U1 and 1 resistance R 1, and wherein R1 is a current-limiting resistance, and its resistance size is determined jointly by the driving port drive current size of microcomputer 235 and the input current parameter of photoelectrical coupler U1.The low pass filter that post-filtering module 236 is made up of inductance L 1 and capacitor C 2 constitutes.Voltage-doubler rectification filtration module 237 is made of two multiplication of voltage full-wave rectifications, the filter circuit that diode D2, D3 and capacitor C 3, C4 form.The full-wave rectification bridge B2 that rectification module 241 is made up of 4 diodes constitutes.Filtration module 242 is made of capacitor C 5.Current source module 243 is made of the mirror current source that resistance R 4 and triode Q2, Q3, Q4 form, and the resistance size that the big I of its output current is overregulated resistance R 4 decides.The negative pole of capacitor C 2 links to each other with the positive pole of capacitor C 3, and the anode of the positive pole of C2 and magnetron M1 links to each other and ground connection.The negative pole of C4 links to each other with the positive pole of current source module 238, and current source module 238 is connected with the cathode filament of magnetron.With regard to entire circuit, C2 connects with C3 and C4, positive pole links to each other with magnetron M1 anode then, negative pole links to each other with the cathode filament of magnetron M1, thereby the series voltage of C2, C3, C4 has been added between the anode and negative electrode of magnetron M1, and the electric current of current source 238 has been added on the cathode filament of magnetron M1.The plus earth of magnetron M1 in the circuit.
As Fig. 7 a is the signal waveforms of microcomputer 234 ports output, and it is a fixed-frequency, the square-wave signal that the linear in time cycle of dutycycle changes.Under the control of this square-wave signal, change along with the change in duty cycle of square-wave signal the switch time of Q1, and after the filtering through inductance L 1 and capacitor C 2, the voltage waveform that forms on capacitor C 2 is shown in Fig. 7 b, and it is a triangular-waveform voltage.The DC voltage addition of this triangle wave voltage and 237 outputs of voltage-doubler rectification filtration module is loaded between the anode and negative electrode of magnetron then.Fig. 7 c is the voltage oscillogram that is carried between anode of magnetron and negative electrode, and magnetron M1 is under the effect of this voltage, and the microwave frequency time history plot of output is shown in Fig. 7 d.
The course of work of the present invention is: the civil power alternating current P of 220V-50Hz is through behind the frequency converter 21, become high-frequency alternating current, then through high frequency transformer 22 transformations, three output ports at high frequency transformer 22 produce different output voltages respectively, the primary coil of first port and the turn ratio of secondary coil are about 1: 2, thereby output voltage is 400V; The primary coil of second port and the turn ratio of secondary coil are about 1: 10, thereby the voltage of output is 2000V; The primary coil of the 3rd port and the turn ratio of secondary coil are 20: 1, thereby the voltage of output is 11V.The voltage of first port and second port is input to magnetron frequency adjustment module 23, the voltage of first port is through behind the rectifying and wave-filtering, the modulation of the pwm signal that process microcomputer 235 produces, through behind the LPF, become the triangle wave voltage of an amplitude about 400V, the DC voltage stack of the voltage that this triangle wave voltage and second port produce about the 4000V that forms after the voltage-doubler rectification filtering, forming a DC component is 4000V, the triangle wave voltage of AC compounent 400V, be loaded into then between the anode and negative electrode of magnetron M1, drive magnetron M1 work.Amplitude of voltage process rectifying and wave-filtering formation of the 3rd port is the DC voltage about 10V, then by current source module 243, obtain a numerical stability DC current, be loaded on the cathode filament of magnetron M1, the current stabilization of cathode filament is at steady state value, the power output of magnetron M1 also just can keep invariable, has played the power output purpose of stabilized magnetron M1.
Claims (8)
1. have two variable frequency microwave stoves of shimming functions, it is characterized in that being provided with body of heater, magnetron and driven by magnetron device, body of heater is provided with heating chamber and circuit arrangement installation cavity, and magnetron and driven by magnetron device are located in the circuit arrangement installation cavity; The driven by magnetron device is provided with frequency converter, high frequency transformer, magnetron frequency adjustment module and magnetron power stability module, frequency converter input termination civil power low frequency ac, inverter output terminal connects the high frequency transformer input, the high frequency transformer output connects magnetron frequency adjustment module input and magnetron power stability module input respectively, and magnetron frequency adjustment module output and magnetron power stability module output connect the magnetron input respectively;
Described magnetron frequency adjustment module is provided with rectification module, the pre-filtering module, switch block, the post-filtering module, photoelectric isolation module, microcomputer and voltage-doubler rectification filtration module, first port of rectification module input termination high frequency transformer output, the output termination pre-filtering module input of rectification module, pre-filtering module output termination switch block input, switch block output termination post-filtering module input, post-filtering module output termination magnetron input, photoelectric isolation module is located between microcomputer output and the switch block input, second port of voltage-doubler rectification filtration module input termination high frequency transformer output, the voltage stack of the voltage of voltage-doubler rectification filtration module output and post-filtering module output, the voltage after the stack is carried on the negative electrode and the input between the anode of magnetron;
Described magnetron power stability module is provided with rectification module, filtration module and current source module, the 3rd port of rectification module input termination high frequency transformer output, rectification module output termination filtration module input, filtration module output termination current source module input, current source module output termination magnetron cathode filament, the plus earth of magnetron.
2. the two variable frequency microwave stoves with shimming functions as claimed in claim 1, it is characterized in that the primary coil of first port of described high frequency transformer output and the turn ratio of secondary coil are 1: 2, the primary coil of second port and the turn ratio of secondary coil are 1: 10, and the primary coil of the 3rd port and the turn ratio of secondary coil are 20: 1.
3. the two variable frequency microwave stoves with shimming functions as claimed in claim 1, the rectification module that it is characterized in that described magnetron frequency adjustment module are the full-wave bridge rectifier circuit that 4 diodes are formed.
4. the two variable frequency microwave stoves with shimming functions as claimed in claim 1 is characterized in that described pre-filtering module is made of electric capacity.
5. the two variable frequency microwave stoves with shimming functions as claimed in claim 1 is characterized in that switch block is made of 1 switch triode and 2 biasing resistors.
6. the two variable frequency microwave stoves with shimming functions as claimed in claim 1 is characterized in that the post-filtering module is made of inductance and electric capacity.
7. the two variable frequency microwave stoves with shimming functions as claimed in claim 1 is characterized in that photoelectric isolation module is made of 1 photoelectrical coupler and 1 current-limiting resistance.
8. the two variable frequency microwave stoves with shimming functions as claimed in claim 1, the rectification module that it is characterized in that described magnetron power stability module are the full-wave bridge rectifier circuit that 4 diodes are formed; The filtration module of described magnetron power stability module is made of electric capacity, and the current source module of described magnetron power stability module is adjustable resistance and 3 mirror current sources that triode is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101131343A CN101737827B (en) | 2009-12-29 | 2009-12-29 | Double frequency conversion microwave oven having function of shimming fields |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101131343A CN101737827B (en) | 2009-12-29 | 2009-12-29 | Double frequency conversion microwave oven having function of shimming fields |
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| Publication Number | Publication Date |
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| CN101737827A CN101737827A (en) | 2010-06-16 |
| CN101737827B true CN101737827B (en) | 2011-09-07 |
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| CN104981039B (en) * | 2015-07-29 | 2017-09-12 | 南通皋鑫电子股份有限公司 | Micro-wave oven starts moment surge pulse detection means |
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|---|---|---|---|---|
| CN1518398A (en) * | 2003-01-27 | 2004-08-04 | Lg������ʽ���� | Variable frequency type frequency conversion microwave oven and its control method |
| CN1571592A (en) * | 2003-07-25 | 2005-01-26 | 乐金电子(天津)电器有限公司 | Microwave oven driver |
| CN1625307A (en) * | 2003-12-05 | 2005-06-08 | Lg电子株式会社 | Inverter microwave oven and method for controlling the same |
| CN2773505Y (en) * | 2005-01-11 | 2006-04-19 | 成都骏元科技发展有限责任公司 | Microwave oven with continous adjustable power |
| CN2884685Y (en) * | 2006-03-09 | 2007-03-28 | 美的集团有限公司 | Microwave oven magnetron variable frequency power supply |
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2009
- 2009-12-29 CN CN2009101131343A patent/CN101737827B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1518398A (en) * | 2003-01-27 | 2004-08-04 | Lg������ʽ���� | Variable frequency type frequency conversion microwave oven and its control method |
| CN1571592A (en) * | 2003-07-25 | 2005-01-26 | 乐金电子(天津)电器有限公司 | Microwave oven driver |
| CN1625307A (en) * | 2003-12-05 | 2005-06-08 | Lg电子株式会社 | Inverter microwave oven and method for controlling the same |
| CN2773505Y (en) * | 2005-01-11 | 2006-04-19 | 成都骏元科技发展有限责任公司 | Microwave oven with continous adjustable power |
| CN2884685Y (en) * | 2006-03-09 | 2007-03-28 | 美的集团有限公司 | Microwave oven magnetron variable frequency power supply |
Non-Patent Citations (2)
| Title |
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| JP平1-258391A 1989.10.16 |
| JP特開2003-109741A 2003.04.11 |
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