Electric heating – Microwave heating – With control system
Patent
1998-02-25
1999-11-02
Hoang, Tu Ba
Electric heating
Microwave heating
With control system
H05B 666
Patent
active
059775300
ABSTRACT:
A switching device is employed in a power supply for driving a magnetron with lower withstand voltage and better controllability. A high frequency heating apparatus comprises a power supply, a leakage transformer connected to the power supply, a first switching device connected in series to a primary coil side of the leakage transformer, a first capacitor, a series circuit of a second capacitor and a second switching device, a driving circuit having an oscillator for driving the first switching device and the second switching device, a rectifier connected to a secondary coil side of the leakage transformer, and a magnetron connected to the rectifier. With this configuration, voltage applied to the first switching device can be clamped, and at the same time, the OFF time can be freely adjustable by the effect of the second capacitor and the second semiconductor switching device.
REFERENCES:
patent: 4931609 (1990-06-01), Aoki
patent: 5012058 (1991-04-01), Smith
patent: 5124518 (1992-06-01), Lee
patent: 5171949 (1992-12-01), Fujishima et al.
patent: 5354972 (1994-10-01), Han
International Search Report for Int'l Appln No. PCT/JP98/00751 dated Feb. 25, 1998.
S.W. Wagner, "Stromversorgung eletronischer Schaltungen und Gerate", 1964, R.V. Decker's Verlag G. Schenk, Hamburg XP002064845, p. 279, paragraph 5--p. 299.
Bessho Daisuke
Ishio Yoshiaki
Mihara Makoto
Omori Hideki
Sakamoto Kazuho
Hoang Tu Ba
Matsushita Electric Industrial Co. Ltd
Pwu Jeffrey
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