Controlled magnetron power supply including dual-mode inverter

Details Controlled magnetron power supply including dual-mode inverter Controlled magnetron power supply including dual-mode inverter

1986-06-17

1988-05-03

Salce, Patrick R.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

315106, 315102, 363 71, H02M 744

Patent

active

047424427

ABSTRACT:
For the magnetron in a microwave oven, a full-bridge inverter power supply comprises two pairs of switching transistors and is conditionally operable to self-oscillate in either of two modes: a first mode wherein one of the two pairs of switching transistors self-oscillates in manner of a half-bridge inverter and powers the magnetron's thermionic cathode, and a second mode wherein both pairs of transistors self-oscillate in manner of a full-bridge inverter and then provide the magnetron's anode power as well as its cathode heating power. The first mode gets initiated immediately upon applying power to the power supply, but the second mode does not get initiated until about 5 seconds after the initiation of the first mode. That way, the cathode will have become fully thermionic prior to applying anode power to the magnetron.

REFERENCES:
patent: 3392309 (1968-07-01), Hickman
patent: 4076996 (1978-02-01), Maehara et al.
patent: 4253043 (1981-02-01), Chermin et al.
patent: 4256992 (1981-03-01), Luursema
patent: 4438372 (1984-03-01), Zuchtriegel
patent: 4525648 (1985-06-01), De Bijl et al.
patent: 4593167 (1986-06-01), Nilssen
patent: 4620078 (1986-10-01), Smith

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