Pulse transformer

Details Pulse transformer Pulse transformer

1978-08-04

1980-09-16

Grimley, Arthur T.

Electric heating

Metal heating

Of cylinders

323 24, 331112, H05B 906, G05F 300

Patent

active

042231957

ABSTRACT:
A pulse transformer is provided for triggering a magnetron in a microwave oven from a low level d.c. control signal. A step-up transformer has a secondary connected to a magnetron triac and a primary connected to a blocking oscillator circuit. The blocking oscillator circuit utilizes a single transistor, at the base of which there is a biasing compacitor. The system is activated by grounding of a control lead in a microprocessor controller for the microwave oven. Grounding of the control lead charges the biasing capacitor until the transistor conducts. Transistor conduction produces a feedback which discharges the capacitor. The circuit electrically isolates the high voltage, high current magnetron power system from the microprocessor controller.

REFERENCES:
patent: 3302060 (1967-01-01), Blok et al.
patent: 3383623 (1968-05-01), Vercellotti et al.
patent: 3831079 (1974-08-01), Iwata

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