Microwave output stabilizing apparatus of a microwave oven and a

Details Microwave output stabilizing apparatus of a microwave oven and a Microwave output stabilizing apparatus of a microwave oven and a

1993-02-12

1995-09-19

Leung, Philip H.

Electric heating

Microwave heating

With control system

219721, 363 49, 363 97, H05B 668

Patent

active

054517508

ABSTRACT:
A microwave output stabilizing apparatus for a microwave oven comprises a rectifier circuit for rectifying power from an AC power supply into a constant DC voltage; an invertor circuit for generating a high frequency power supply by controlling the DC voltage at an intermittent output state; a high voltage transformer for stepping up the high frequency power supply; and magnetron drive circuit for rectifying the high frequency power supply and oscillating a magnetron. Also, an inverter control circuit detects the current flowing into the primary winding of the high voltage transformer, converts the detected current into a corresponding voltage, the corresponding voltage with a reference voltage, and controls the inverter circuit according to the results of the comparison. Further included are an anode current detecting circuit for detecting the anode current of the magnetron and converting the detected anode current into the corresponding voltage; and, a reference voltage adjusting circuit for evaluating the anode current and changing the reference voltage of the invertor control circuit in accordance with the results of the evaluation.

REFERENCES:
patent: 4903183 (1990-02-01), Noguchi et al.
patent: 5003141 (1991-03-01), Braunisch et al.
patent: 5171948 (1992-12-01), Ishii
patent: 5171949 (1992-12-01), Fujishima et al.
patent: 5274208 (1993-12-01), Noda

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