Magnetron power supply with indirect sensing of magnetron current
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United States of America Patent
Stats
-
Mar 26, 1991
Grant Date -
N/A
app pub date -
Oct 11, 1989
filing date -
Oct 14, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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