Electric heating – Metal heating – Of cylinders
Patent
1976-11-04
1978-09-05
Reynolds, Bruce A.
Electric heating
Metal heating
Of cylinders
219 1077, 363 45, 363 95, H05B 504
Patent
active
041122879
ABSTRACT:
An apparatus for inductively heating cooking utensils comprising four induction cooking coils excited by a central power oscillator providing an alternating sinusoidal excitation voltage at about 25 kilohertz which is 100% amplitude modulated at 120 hertz. Power to the four induction coils is duty cycle controlled by four 60 hertz triacs each series inserted between the power oscillator and a respective one of the induction coils. The triacs switch to excite their respective induction coils only at the zero point of the excitation voltage modulation envelope. Line power fluctuations are minimized by sequential switching of the triacs in a manner that results in an effective power switching frequency of approximately 46 hertz when all four induction cooking coils are excited. The central power oscillator is inherently protected from high Q load conditions without the provision of feedback loops.
REFERENCES:
patent: 3434010 (1969-03-01), Weit
patent: 3514688 (1970-05-01), Martin
patent: 3786219 (1974-01-01), Kornrumpf
patent: 3925633 (1975-12-01), Partridge
patent: 4016391 (1977-04-01), Kiuchi et al.
Heinrich Theodore M.
Oates Robert M.
Reynolds Bruce A.
White-Westinghouse Corporation
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