Power supply circuit in microwave ovens

Details Power supply circuit in microwave ovens Power supply circuit in microwave ovens

1989-06-27

1990-08-14

Wong, Peter S.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 86, 363135, 219 1055B, H02M 3335, H05B 666

Patent

active

049492330

ABSTRACT:
A power supply circuit for a high-frequency source (M) in a microwave oven includes a switched-mode-power-supply unit having a resonant circuit which contains a coil (L2) and a controllable switch (D1). The switching of the controllable switch is controlled by a control circuit (K) via a driving stage (S). The power supply circuit is cooled by a fan (F). The required DC voltages for supplying the driving stage, control circuit and fan are obtained by means of an auxiliary winding (W1, W2) on the coil (L2) and a rectifier (D3, D4). This results in a saving in both space and costs. At the same time, automatic supervision of the different functional units of the power supply circuit is obtained.

REFERENCES:
patent: 3303405 (1967-02-01), Schwarz
patent: 4055791 (1977-10-01), Bland et al.
patent: 4096559 (1978-06-01), Sakurada et al.
patent: 4142082 (1979-02-01), Israel
patent: 4275281 (1981-06-01), Kiuchi
patent: 4383156 (1983-05-01), Furusawa
patent: 4409647 (1983-10-01), Terkanian
patent: 4539453 (1985-09-01), Miyazaki et al.

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