Induction heating apparatus comprising a static converter

Details Induction heating apparatus comprising a static converter Induction heating apparatus comprising a static converter

1975-12-15

1977-11-15

Reynolds, Bruce A.

Electric heating

Metal heating

Of cylinders

219 1049R, 307252M, 363 57, H05B 504

Patent

active

040586960

ABSTRACT:
An induction heating apparatus comprising a static converter including a bidirectional controlled switch having a main thyristor and a diode connected in parallel to conduct in opposite directions. The converter comprises a first circuit for protection against the spurious turning on of the thyristor caused by overshoot voltages due to the sudden interruption of the current flowing through the charging inductor when the switch is turned off. This protection circuit comprises, connected in series across the charging inductor, a diode and a capacitor which is charged through the diode when the voltage across the inductor terminals becomes positive, and discharged through a current-limiting resistor and an auxiliary thyristor into the gate of the main thyristor for triggering it periodically. A novel second circuit for protection against excessive rates of rise of the voltage across the thyristor is also provided, including a resistor and a capacitor in series, connected in parallel with the inductance of the resonant commutating circuit.

REFERENCES:
patent: 2517425 (1950-08-01), Grumel
patent: 2662162 (1953-12-01), Blok
patent: 3273046 (1966-09-01), Bedford
patent: 3379955 (1968-04-01), Koetsch
patent: 3652874 (1972-03-01), Partridge
patent: 3710002 (1973-01-01), Peters
patent: 3781503 (1973-12-01), Haanden et al.
patent: 3832573 (1974-08-01), Planck et al.
McMurray, "Optimum Snubbers for Power Semiconductors," IEEE Trans. Industry Applications, Sept./Oct. 1972, vol. 1A-8, No. 5, pp. 593-630.
J. M. Peter, "Protection of Diodes & Thyristors Against Overvoltages," Toute l'Electroniques, No. 399, 5/75, pp. 47-55.
M. M. Peter, "A New Thyristor Allows the Construction of a 40 KHz Inverter," Sescosem, No. 3, 4/76, pp. 10-17.

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