H - Electricity – 03 – B
Patent
H - Electricity
03
B
331/30, 355/55
H03B 11/10 (2006.01) H02M 3/338 (2006.01)
Patent
CA 2013713
A magnetron is powered via an output transformer TR whose primary winding (a) is connected in series with a resonant converter oscillator circuit comprising an inductor (L) and a capacitor (C3) and switching transistors (T1, T2) which are connected to positive and negative power supply terminals and are switched by respective current transformers (CT1, CT2). The switching points of the switching transistors are varied so as to vary the output of the circuit by varying the positive and negative flux excursions in the cores of the transformers (CT1, CT2) such that the net flux excursions are sufficient to saturate the transformers and switch off the switching transistors at a predetermined point in each half cycle. The relative positive and negative flux excursions in the transformer cores are controlled by providing additional winings (g) which are connected to a control circuit which rectifies the output of these windings and controls the rectified DC voltage appearing across them.
Aktiebolaget Electrolux
Oyen Wiggs Green & Mutala Llp
LandOfFree
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