Magnetron power supply with indirect sensing of magnetron curren

Details Magnetron power supply with indirect sensing of magnetron curren Magnetron power supply with indirect sensing of magnetron curren

1989-10-11

1991-03-26

Beha, Jr., William H.

Electric heating

Metal heating

Of cylinders

363 28, 363 61, H05B 666

Patent

active

050031414

ABSTRACT:
A magnetron (M) serving as the microwave source in a microwave oven is driven by a Switch Mode Power Supply (SMPS). The resonance circuit of the Power Supply contains a transformer (Tr), the secondary side of which is connected to the magnetron via a voltage multiplier consisting of a rectifier and voltage doubler circuit (C3, C4, D3, D4). In order to obtain a feedback signal which is proportional to the power fed to the magnetron thereby to regulate this power, a current transformer (ST) is connected in series with one of the diodes (D3) in the rectifier and voltage doubler circuit. The output signal of the current transformer is compared in a control circuit (K) with a reference signal and the result of the comparison is used to control the switch frequency and thereby the magnetron power.

REFERENCES:
patent: 4096559 (1978-06-01), Sakurada et al.
patent: 4138635 (1979-02-01), Quinn
patent: 4386395 (1983-05-01), Francis
patent: 4415887 (1983-11-01), Kawase
patent: 4903183 (1990-02-01), Noguchi et al.

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