Electric heating – Metal heating – Of cylinders
Patent
1980-01-25
1982-11-09
Reynolds, B. A.
Electric heating
Metal heating
Of cylinders
219 1049R, 363131, 363 56, 363 97, 323282, H05B 606, H02M 7537
Patent
active
043586546
ABSTRACT:
A static power switching system utilizes a parallel LC resonant circuit which is energized from a unilateral electrical power source through a switch circuit beginning at the point of minimum voltage across the switch circuit. Current drive to the resonant circuit at the point of minimum voltage across the switching element is obtained by controlled switching of a power transistor switch circuit using a switch control circuit that detects the minimum point of a voltage swing across the switch circuit and generates a switch control signal pulse. The switch control signal pulse is adjustable in duration depending upon load requirements and is applied as base drive to the power transistor. Power take off is by coupling to the inductor of the resonant circuit through its magnetic field. The switching system is particularly adapted for use in induction heating apparatus.
REFERENCES:
patent: 3823297 (1974-07-01), Cunningham
patent: 4017701 (1977-04-01), Mittelmann
patent: 4115676 (1978-09-01), Higuchi et al.
patent: 4196469 (1980-04-01), Gurwicz
patent: 4209683 (1980-06-01), Kiuchi et al.
patent: 4210792 (1980-07-01), Higuchi et al.
Leung Philip H.
Reynolds B. A.
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