Switching power supply for microwave oven

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

1990-10-31

1992-01-21

Beha, Jr., William H.

Electric heating

Metal heating

Of cylinders

363 19, 363 37, H05B 668, H02M 75383

Patent

active

050829980

ABSTRACT:
The present invention relates to a switching power supply for a microwave oven in which a DC power is changed to a pulse 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 the magnetron) coupled to a secondary winding. The inverter transformer has a supplementary winding which is coupled to control side of the switching element to form a self-excited voltate resonance type. As to the self-excited type, a switching frequency is changed by itself relative to the change of the input voltage and output power for stabilizing the output, thereby realizing same level of operation as a power switching circuit compulsory excited from outside control circuit (hereinafter referred to as The Outside-excited type).

REFERENCES:
patent: 3562623 (1971-02-01), Farnsworth
patent: 3973165 (1976-08-01), Hester
patent: 4628284 (1986-12-01), Bruning et al.
patent: 4939632 (1990-07-01), Plagge et al.
patent: 5010468 (1991-04-01), Nilssen

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