Electric heating – Metal heating – Of cylinders
Patent
1983-11-14
1984-09-25
Envall, Jr., Roy N.
Electric heating
Metal heating
Of cylinders
219 1049R, 363133, H05B 606
Patent
active
044737327
ABSTRACT:
An induction heating arrangement adapted for energization by a pulsating power supply of relatively low frequency is provided, in which an induction heating coil is coupled to the power supply by a pair of power transistors arranged for push-pull operation. Alternately switching each of the power transistors into conduction causes current pulses of opposite direction to alternately flow in the coil. The transistors are arranged to switch at a frequency which is high relative to the frequency of the power supply and which varies directly with the instantaneous amplitude of the power supply voltage. The amplitude of the current pulses varies directly with the instantaneous amplitude of the power supply and the duration of the pulses varies inversely with amplitude of the power supply with the result that the amount of energy delivered to the coil by each current pulse is essentially uniform from pulse to pulse.
REFERENCES:
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Envall Jr. Roy N.
General Electric Company
Houser H. Neil
Lateef M. M.
Reams Radford M.
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