Induction heating apparatus with negative feedback controlled pu

Details Induction heating apparatus with negative feedback controlled pu Induction heating apparatus with negative feedback controlled pu

1979-06-21

1981-07-07

Grimley, Arthur T.

Electric heating

Metal heating

Of cylinders

219 1077, 363 97, 363 80, 323285, H05B 606, H05B 612, H02M 748

Patent

active

042776678

ABSTRACT:
An induction heating apparatus includes a DC power source, a transistor for generating a trigger current in response to a base drive pulse applied thereto, and a resonant load circuit including a work coil and a capacitor for generating in response to the trigger current an oscillating resonant current when the switching device is turned off, and which current is passed through a diode connected in inverse parallel relation with the transistor. A current transformer is provided to detect the load current. A low voltage detector senses a nearly zero voltage at the collector of the transistor and triggers a ramp generator to generate a ramp voltage which is compared with a reference voltage to generate a train of base drive pulses for application to the transistor. To control the base drive pulses at a variable duration in accordance with an inductive load, the reference voltage is varied as an inverse function of the sensed load current.

REFERENCES:
patent: 3733540 (1973-05-01), Hawkins
patent: 3798531 (1974-03-01), Allington
patent: 3846694 (1974-11-01), Archer
patent: 4112286 (1978-09-01), Alderman et al.
patent: 4115676 (1978-09-01), Higuchi et al.
patent: 4145592 (1979-03-01), Mizukawa et al.

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