Half-bridge converter switching power supply for magnetron

Details Half-bridge converter switching power supply for magnetron Half-bridge converter switching power supply for magnetron

1992-06-01

1994-06-14

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

363 21, 363 98, H05B 668

Patent

active

053212355

ABSTRACT:
A power source apparatus for microwave oven includes a half-bridge converter including a series connection of switching elements, a series connection of resonance capacitors, and a high frequency transformer having a primary winding and a secondary winding, and the half-bridge converter is driven by an output of a diode bridge which receives a commercial power source of 200 V. A current transformer detects a current of the primary winding. A control circuit compares a voltage equal to an average value of the current detected by the current transformer and a voltage set by a microcomputer, and controls the switching elements at a frequency in proportion to a magnitude of a difference of the both voltages, whereby a high frequency high voltage is induced on the secondary winding and applied to a voltage doubler rectifying circuit, and then a direct current high voltage is applied to a magnetron.

REFERENCES:
patent: 4777575 (1988-10-01), Yamato et al.
patent: 4866589 (1989-09-01), Satoo et al.
patent: 4920246 (1990-04-01), Aoki
patent: 5124518 (1992-06-01), Lee

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