High frequency heating apparatus with a temperature compensated

Details High frequency heating apparatus with a temperature compensated High frequency heating apparatus with a temperature compensated

1990-07-12

1991-06-04

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219492, 363 21, 363 97, 323907, H05B 668

Patent

active

050216201

ABSTRACT:
A microwave oven includes an inverter inducing a high frequency oscillating current at a primary winding of a transformer via a switching element turned on and off, a magnetron to which a high voltage is applied by the transformer, a temperature sensor sensing the temperature of heat generated by the switching element to thereby generate a temperature signal, and a microcomputer compensating "on" and "off" periods of the switching element in response to the temperature signal from the temperature sensor so that an increase in an amount of an anode current in the magnetron is restrained with an increase of the temperature sensed by the temperature sensor. The microcomputer also functions to deenergize the switching element when the temperature of the switching element sensed by the temperature sensor exceeds a predetermined value.

REFERENCES:
patent: 4318165 (1982-03-01), Kornrumpf et al.
patent: 4481393 (1984-11-01), Ueda
patent: 4694239 (1987-09-01), Marchio' et al.
patent: 4777575 (1988-10-01), Yamato et al.
patent: 4866589 (1989-09-01), Satoo et al.

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