Switching power supply for microwave oven

Details Switching power supply for microwave oven Switching power supply for microwave oven

1990-10-31

1992-12-15

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

363 49, 323 901, H05B 668

Patent

active

051719495

ABSTRACT:
The present invention relates to a switching power supply a microwave oven in which DC power is changed to a pulse form by means of a switching element coupled to a primary winding of an inverter transformer to supply the power to a high frequency oscillator (hereinafter referred to as a magnetron) coupled to a secondary winding. A reference voltage is set lower than an ordinary state from the time of turning on until the oscillation of the magnetron starts. Accordingly, power supplied from the secondary winding of the inverter transformer to the magnetron is set to a low level. The reference voltage increases when oscillation of the magnetron starts, and returns to the ordinary state when the oscillation returns to the ordinary state.

REFERENCES:
patent: 3398371 (1968-08-01), Lamb
patent: 3611017 (1971-10-01), Freeland
patent: 4866589 (1989-09-01), Satoo et al.
patent: 4866590 (1989-09-01), Odaka et al.
patent: 4962292 (1990-10-01), Aoki
patent: 4967051 (1990-10-01), Maehara et al.
patent: 4992637 (1991-02-01), Ishiyama
patent: 5003141 (1991-03-01), Braunisch et al.
patent: 5082998 (1992-01-01), Yoshioka

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