Minimizing lamp flicker and blower speed variation in a microwav

Details Minimizing lamp flicker and blower speed variation in a microwav Minimizing lamp flicker and blower speed variation in a microwav

1977-04-25

1978-10-17

Truhe, J. V.

Electric heating

Metal heating

Of cylinders

323 58, 323 60, H05B 906

Patent

active

041210794

ABSTRACT:
A microwave oven circuit includes a magnetron power transformer and a duty cycle controlled switching element connected to periodically energize the power transformer from an AC power source. Due to the effects of power source loading, the available AC voltage drops during those intervals when the power transformer is energized. This undesirably causes cyclical variation in the operation of certain constantly energized load devices such as the oven lamp and the motor for the blower which provides cooling air for the magnetron. To minimize the undesirable voltage variation, a low voltage secondary winding on the magnetron power transformer is connected in series with the constantly energized load device and properly phased to provide a voltage boost upon energization of the power transformer. Preferably, the low voltage secondary winding is an otherwise unused winding originally intended to be a magnetron filament winding. As a result, very little additional cost is involved.

REFERENCES:
patent: 3514566 (1970-05-01), Ironfield
patent: 3614595 (1971-10-01), Paulden
patent: 3710065 (1973-01-01), Crapuchettes
patent: 3824365 (1974-07-01), Tapper
patent: 3842233 (1974-10-01), Lamb
patent: 3943317 (1976-03-01), Nagamoto
patent: 3967156 (1976-06-01), Levie
patent: 4041267 (1977-08-01), Wechsler
Radio Amateur's Handbook, 45 edition, p. 325, copyright 1968, American Radio Relay League, Inc.

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