Regulated microwave oven and method, using uniformly spaced, int

Details Regulated microwave oven and method, using uniformly spaced, int Regulated microwave oven and method, using uniformly spaced, int

1983-12-16

1985-03-26

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1055M, 323319, H05B 668

Patent

active

045075310

ABSTRACT:
A method and apparatus for regulating a microwave oven to a predetermined output power level. The anode current or a voltage corresponding to it is monitored to provide a signal indicative of the actual output power of the magnetron. Time is divided into a sequence of equal time intervals, each interval corresponding to fixed number of ac line cycles. In accordance with the signal, the number of ac cycles to be supplied to the power supply for each interval to regulate the output power towards the regulated level is determined. The determined number of cycles are supplied by switching at the zero current crossings between the line and the power supply. The switching is executed so that the supplied ac cycles are distributed substantially uniformly over the particular time interval.

REFERENCES:
patent: 3562625 (1971-02-01), van den Broek
patent: 3890562 (1975-06-01), West
patent: 4012617 (1977-03-01), Burke et al.
patent: 4334147 (1982-06-01), Payne
patent: 4374321 (1983-02-01), Cunningham et al.
patent: 4377739 (1983-03-01), Eckert et al.
patent: 4390768 (1983-06-01), Teich et al.
patent: 4420668 (1983-12-01), Larsen et al.
IEEE Transactions on Industrial Electronics & Control Instrumentation, vol. IECI-25, No. 2, pp. 149-154, S87580072, (May 78).

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