Electronic microwave oven power supply

Details Electronic microwave oven power supply Electronic microwave oven power supply

1982-08-02

1986-06-03

Shaw, Clifford C.

Electric heating

Metal heating

Of cylinders

331 88, 363 23, 363 37, 363 75, H05B 664

Patent

active

045931674

ABSTRACT:
A power supply for a magnetron is adapted to be powered from a regular power line and comprises an inverter means operable to provide an AC voltage of relatively high frequency. This relatively high-frequency AC voltage is applied to a step-up transformer, which transformer exhibits a relatively high leakage inductance between its input and output windings. A capacitor is connected across this transformer's output winding and effectively resonates with the internal inductance thereof. A rectifier and filter means is connected in parallel circuit with this capacitor, and provides an output of current-limited substantially constant-magnitude DC voltage for application to the magnetron. As a result, the magnetron is efficiently powered with a nearly constant DC voltage, as contrasted with the pulsed DC voltage normally used for powering magnetrons.

REFERENCES:
patent: 3514566 (1970-05-01), Ironfield
patent: 3961152 (1976-06-01), Staats
patent: 3973165 (1976-08-01), Hester
patent: 4002875 (1977-01-01), Kiuchi et al.
patent: 4236055 (1980-11-01), Kaminaka
patent: 4270082 (1981-05-01), Zaveri
patent: 4279011 (1981-07-01), Nilssen
patent: 4339792 (1982-07-01), Yasumura et al.
Electronic Engineering, "200 KHz Power FET Technology in OEM Modular Power Supplies"; (FIG. 3, p. 40); Sep. 1981.
Electronics; "The Supply Specifier Has a Basic Choice"; (p. 114); Jun. 16, 1981.
"A Resonant Converter with PWM Control"; Mamon, M. et al., Interec '81, Third International Telecommunications Energy Conference, London, England (May 1981).

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