WO2006043513A2 - 高周波加熱電源装置 - Google Patents
高周波加熱電源装置 Download PDFInfo
- Publication number
- WO2006043513A2 WO2006043513A2 PCT/JP2005/019047 JP2005019047W WO2006043513A2 WO 2006043513 A2 WO2006043513 A2 WO 2006043513A2 JP 2005019047 W JP2005019047 W JP 2005019047W WO 2006043513 A2 WO2006043513 A2 WO 2006043513A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- power supply
- frequency
- magnetron
- heating power
- frequency heating
- Prior art date
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Classifications
-
- 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
- H05B6/685—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 low 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 control for suppressing generation of harmonic currents in the field of a high-frequency heating power supply apparatus that performs dielectric heating by driving a magnetron like a microwave oven.
- FIG. 9 shows an example of a high-frequency heating power supply device (inverter power supply) for driving a magnetron.
- DC power supply 1 leakage transformer 2, first semiconductor switching element 3, first capacitor 5 (snapper capacitor), second capacitor 6 (resonance capacitor), third capacitor 7 (smoothing capacitor), second The semiconductor switching element 4, the drive unit 13, the full-wave voltage doubler rectifier circuit 11, and the magnetron 12.
- the DC power supply 1 applies full-wave rectification to the commercial power supply and applies the DC voltage VDC to the series circuit of the second capacitor 6 and the primary winding 8 of the leakage transformer 2.
- the first semiconductor switching element 3 and the second semiconductor switching element 4 are connected in series, and the series circuit of the primary winding 8 and the second capacitor 6 of the leakage transformer 2 is connected to the second semiconductor switching element 4. Connected in parallel.
- the first capacitor 5 is connected in parallel to the second semiconductor switching element 4, and has a snubber role for suppressing inrush current (voltage) generated during switching. Leakage
- the AC high voltage output generated in the secondary winding 9 of the lance 2 is converted into a DC high voltage by the full-wave voltage doubler rectifier circuit 11 and applied between the anode swords of the magnetron 12.
- the tertiary winding 10 of the leakage transformer 2 supplies current to the power sword of the magnetron 12.
- the first semiconductor switching element 3 and the second semiconductor switching element 4 are composed of an IGBT and a flywheel diode connected in parallel thereto. Needless to say, the first and second semiconductor switching elements 3 and 4 are not limited to this type, and thyristors, GTO switching elements, and the like may be used.
- the drive unit 13 has an oscillation unit for generating drive signals for the first semiconductor switching element 3 and the second semiconductor switching element 4 therein, and a rectangular wave having a predetermined frequency is generated in the oscillation unit. Then, the DRIVE signal is given to the first semiconductor switching element 3 and the second semiconductor switching element 4. Immediately after one of the first semiconductor switching element 3 or the second semiconductor switching element 4 is turned off, the voltage at both ends of the other semiconductor switching element is high. Loss and noise occur. However, by providing a dead time, the turn-off is delayed until the voltage at both ends is reduced to about 0 V, so that the unnecessary loss and noise generation can be prevented. Of course, it works in the same way when switching in reverse.
- FIG. 10 shows the resonance characteristics of this type of inverter power supply circuit (a resonance circuit is composed of inductance L and capacitance C).
- Figure 10 is a diagram showing the current frequency characteristics when a constant voltage is applied.
- the frequency fO is the resonance frequency.
- the current frequency curve characteristic 11 (solid line) in the frequency range fl to f 3 higher than this frequency fO is used. That is, at the resonance frequency fO, the current II is maximum, and the current II decreases as the frequency range increases from fl to f3. This is because the current that flows to the secondary side of the leakage transformer increases as the frequency decreases between fl and f3, so the current that flows to the secondary side of the leakage transformer increases.
- a desired output is obtained by changing the frequency of an inverter power source that drives a magnetron that is a non-linear load. For example, a linear continuous output that is impossible with an LC power source can be obtained, such as near f3 when using 200 W output, near f2 when using 600 W output, and near fl when using 1200 W output.
- the inverter operating frequency is used in this section to match the characteristics of a magnetron that does not oscillate at high frequency unless a high voltage is applied near 0 ° and 180 ° of the power phase. Set near fl where the resonance current increases. This increases the step-up ratio of the magnetron applied voltage to the commercial power supply voltage and widens the conduction angle for emitting radio waves. As a result, by changing the inverter operating frequency for each power supply phase, it is possible to realize a current waveform with more fundamental components and fewer harmonic components.
- FIG. 11 shows a characteristic diagram including the applied voltage necessary for the magnetron to irradiate the microwave, that is, the oscillation threshold and the temperature change of the value ebm.
- the horizontal axis represents the anode current la flowing after the magnetron oscillates, and the vertical axis represents the applied voltage between the magnetron anode and the force sword.
- the magnetron is energized with a negative voltage, and oscillates with an applied voltage of about -4 KV, the anode current begins to flow, and the antenna force microwave is irradiated.
- the magnetron oscillation threshold ebm is temperature dependent and tends to decrease as the temperature increases.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2004-6384
- Patent Document 2 Japanese Patent Laid-Open No. 2000-58252
- the power supply harmonic measurement measures the specified time several times in consideration of actual use, so it corresponds to changes in the oscillation threshold ebm due to magnetron temperature changes. There is a need to. However, there was a problem of deviating from the standard value at the end of the power harmonic measurement if the constant feedback control of the input current that followed the change of the oscillation threshold ebm was not performed.
- the present invention integrates the amount of change in the input current due to the change in the magnetron oscillation threshold value ebm as stored information! By changing the bias, it is possible to easily and optimally follow the ebm change.
- the present invention controls the input current to be constant with respect to the change in the oscillation threshold value ebm caused by the temperature change of the magnetron, and at the end of the harmonic in the power supply harmonic measurement. While suppressing the expansion of components, an improvement in margin to the standard value can be expected.
- the high frequency heating power supply device of the present invention it is possible to realize feedback control that performs frequency modulation control that optimally tracks the change in the oscillation threshold value ebm caused by the temperature change of the magnetron. It can be expected to improve the power supply harmonic specification margin while suppressing the wave component. Furthermore, by setting an upper limit and a lower limit for the noise value, it is possible to operate safely even when the voltage fluctuates abnormally to the + side or the one side with respect to the rating.
- FIG. 1 is a circuit configuration diagram of a high-frequency heating power supply apparatus according to Embodiments 1 to 4 of the present invention.
- ⁇ 2 ebm tracking bias circuit diagram in embodiment 1 of the present invention
- ⁇ 3 Accumulated information of input current correction in embodiment 1 of the present invention POW-bias value characteristics graph
- FIG.11 Characteristic diagram showing the relationship between magnetron oscillation threshold ebm and la with respect to temperature change
- a first invention is a high-frequency heating power supply apparatus that drives a magnetron by performing a high-frequency switching operation with a semiconductor switching element using a commercial power supply.
- the oscillation threshold value ebm is reduced due to a temperature change of the magnetron.
- the input current constant control with respect to is characterized in that the amount of change in the input current is accumulated as accumulated information, and feedback control is performed based on that information.
- the second invention is characterized in that, in particular, in the first invention, the feedback control is performed by applying a bias to an input voltage information waveform that is a basis of a frequency modulation waveform shape.
- the third invention is characterized in that, in particular, in the second invention, an upper limit is provided for the bias.
- the fourth invention is characterized in that, in particular, the bias is provided with a lower limit in the second invention.
- the fifth invention is characterized in that, in particular, in the second invention, the bias is provided with an upper limit and a lower limit.
- FIG. 1 shows an inverter circuit for driving a magnetron according to the first embodiment of the present invention.
- the frequency modulation generation circuit 15 first forms a frequency modulation waveform using a waveform obtained by resistance division based on the commercial power supply voltage.
- the frequency modulation generating circuit 15 performs feedback control in response to a signal from the input constant control circuit 19 that performs constant control so as to obtain a desired input (2 OOW or 600 W).
- a desired input (2 OOW or 600 W).
- the actual operating frequency is finally determined by the oscillation circuit 16 based on the signal obtained from the frequency modulation generation circuit 15, and the dead time generation circuit 17
- the dead time is determined, and a rectangular wave generated by the switching element drive circuit 18 is applied to the gates of the first semiconductor switching element 3 and the second semiconductor switching element 4.
- FIG. 2 is a detailed circuit of the ebm tracking bias circuit 20.
- the oscillation level obtained from the input constant control circuit 19 is determined by weighting the input current correction accumulated information (POW) and the power supply voltage information according to the change of the value ebm by a resistance network, and the follow-up level is determined.
- the stored information POW has an initial value that changes depending on the input, for example, 5.5V at 2000W input and 7.5V at 600W input, and the initial value force by changing the oscillation threshold ebm due to the temperature change of the magnetron. Rise gradually. This is because the amount corrected by the input current constant circuit is accumulated (claim 1).
- FIG. 3 shows the degree of change in the bias value BIAS applied to the frequency modulation generating circuit 15 with respect to the change in the stored information POW of the input current correction by the setting of the resistor network.
- it means the amount of change in the bias with respect to the change in the oscillation threshold ebm
- the slope of the characteristic diagram shown in Fig. 3 represents the degree of follow-up of the ebm change.
- the ebm tracking degree can be easily adjusted by setting the resistance network 201 to 204, and the frequency modulation waveform shape changes according to the obtained bias value, that is, the operating frequency of the part to which the bias is applied is controlled to increase. Is done.
- Figure 4 shows the detailed change in the frequency modulation waveform of this control.
- Thick solid line indicates frequency modulated wave when magnetron is cold (initial)
- the thick dotted line is the frequency modulation waveform when the magnetron is warm.
- a bias is applied to the rectified power supply voltage information waveform in order to increase the inverter operating frequency in order to keep the input current constant due to a decrease in the oscillation threshold ebm due to the temperature change of the magnetron.
- Fine adjustment of the current waveform shape is performed by increasing the operating frequency of the selected part. As a result, the harmonic component expansion due to the change in the input current waveform due to the decrease in the oscillation threshold ebm can be suppressed as much as possible, and the power supply harmonic performance can be satisfied (claim 2).
- the quality stability design method (QSD), which is our unique scientific solution that improves the Taguchi method, is used. It is also added that the resistance network can be weighted more quickly and can be weighted more quickly, and the oscillation frequency and the degree of follow-up to changes in the value ebm can be easily determined.
- an upper limit is set for the bias value applied to the frequency modulation waveform.
- the frequency modulation waveform rises due to the applied bias value.
- the bias value that keeps the input current constant will rise without limit. End up.
- the inverter operating frequency tends to be higher and there is a limit to the switching speed.
- a lower limit is set for the bias value applied to the frequency modulation waveform. If the frequency modulation waveform shown in Fig. 4 is lowered, the overall inverter operating frequency is lowered and high output is obtained. In this case, the inverter operating frequency must be further reduced in order to obtain high output if the rated voltage is reduced. Actually, the inverter operating frequency has a human audible range, and 18KHz is considered as the lower limit. A separate lower limit is given to the frequency modulation waveform as the minimum frequency limit.
- FIG. 7 shows a method that combines both Example 2 and Example 3 above, and concerns when the power supply voltage abnormally fluctuates to the + side or the side of the rating by setting an upper limit and a lower limit for the bias value.
- FIG. 8 is a graph showing the characteristics of the POW bias value in Example 4. Even if the power supply voltage fluctuates abnormally to the + side and the POW setting changes, the bias value can only change between the upper and lower limits, which is safe.
- the high-frequency heating power supply device of the present invention can realize feedback control that performs frequency modulation control that optimally follows the change in the oscillation threshold value ebm caused by the temperature change of the magnetron.
- it can be expected to improve the standard margin of power supply harmonics while suppressing harmonic components, so it can be applied to various inverter circuits.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05793497A EP1811813B1 (en) | 2004-10-19 | 2005-10-17 | High-frequency heating power source |
US11/577,344 US7432484B2 (en) | 2004-10-19 | 2005-10-17 | Current control for high-frequency heating apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004304095A JP2006120339A (ja) | 2004-10-19 | 2004-10-19 | 高周波加熱電源装置 |
JP2004-304095 | 2004-10-19 |
Publications (1)
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WO2006043513A2 true WO2006043513A2 (ja) | 2006-04-27 |
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PCT/JP2005/019047 WO2006043513A2 (ja) | 2004-10-19 | 2005-10-17 | 高周波加熱電源装置 |
Country Status (5)
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US (1) | US7432484B2 (ja) |
EP (1) | EP1811813B1 (ja) |
JP (1) | JP2006120339A (ja) |
CN (1) | CN100548081C (ja) |
WO (1) | WO2006043513A2 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8273782B2 (en) | 2007-02-07 | 2012-09-25 | Glaxosmithkline Llc | Inhibitors of Akt activity |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100294751A1 (en) * | 2009-05-22 | 2010-11-25 | Innovative Engineering & Product Development, Inc. | Variable frequency heating controller |
US8882759B2 (en) | 2009-12-18 | 2014-11-11 | Covidien Lp | Microwave ablation system with dielectric temperature probe |
US8568404B2 (en) | 2010-02-19 | 2013-10-29 | Covidien Lp | Bipolar electrode probe for ablation monitoring |
GB201011789D0 (en) * | 2010-07-13 | 2010-08-25 | Ceravision Ltd | Magnetron power supply |
CN103108423B (zh) * | 2012-11-14 | 2016-04-13 | 明达实业(厦门)有限公司 | 一种单管电磁场发生器 |
CN111726894B (zh) * | 2020-06-18 | 2023-04-18 | 蔡秀珍 | 一种高频电波加热系统及控制方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000058252A (ja) | 1998-08-06 | 2000-02-25 | Matsushita Electric Ind Co Ltd | 高周波加熱装置 |
JP2004006384A (ja) | 2003-07-17 | 2004-01-08 | Matsushita Electric Ind Co Ltd | 高周波加熱装置 |
US20040074900A1 (en) | 2002-06-21 | 2004-04-22 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for controlling electric power for high-frequency induction heating |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0357194A (ja) * | 1989-07-25 | 1991-03-12 | Matsushita Electric Ind Co Ltd | 高周波加熱装置 |
GB2335746B (en) * | 1998-03-24 | 2000-10-11 | Samsung Electronics Co Ltd | Microwave oven with food quantity detection |
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2004
- 2004-10-19 JP JP2004304095A patent/JP2006120339A/ja active Pending
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2005
- 2005-10-17 CN CNB2005800356180A patent/CN100548081C/zh active Active
- 2005-10-17 US US11/577,344 patent/US7432484B2/en active Active
- 2005-10-17 WO PCT/JP2005/019047 patent/WO2006043513A2/ja active Application Filing
- 2005-10-17 EP EP05793497A patent/EP1811813B1/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000058252A (ja) | 1998-08-06 | 2000-02-25 | Matsushita Electric Ind Co Ltd | 高周波加熱装置 |
US20040074900A1 (en) | 2002-06-21 | 2004-04-22 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for controlling electric power for high-frequency induction heating |
JP2004006384A (ja) | 2003-07-17 | 2004-01-08 | Matsushita Electric Ind Co Ltd | 高周波加熱装置 |
Non-Patent Citations (1)
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See also references of EP1811813A4 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8273782B2 (en) | 2007-02-07 | 2012-09-25 | Glaxosmithkline Llc | Inhibitors of Akt activity |
Also Published As
Publication number | Publication date |
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CN100548081C (zh) | 2009-10-07 |
JP2006120339A (ja) | 2006-05-11 |
EP1811813B1 (en) | 2012-06-27 |
EP1811813A1 (en) | 2007-07-25 |
US7432484B2 (en) | 2008-10-07 |
CN101073291A (zh) | 2007-11-14 |
EP1811813A4 (en) | 2007-10-31 |
US20080061055A1 (en) | 2008-03-13 |
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