Induction heating apparatus utilizing output energy for powering

Details Induction heating apparatus utilizing output energy for powering Induction heating apparatus utilizing output energy for powering

1983-08-18

1986-06-17

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1049R, 363 21, 363 97, H05B 606

Patent

active

045958149

ABSTRACT:
An induction heating apparatus comprises a rectifier (2) for rectifying a voltage from an AC mains supply, a resonance circuit formed by an induction heating coil (4) and a capacitor (4), a semiconductor switching device (6) connected in circuit with the resonance circuit to the output of the rectifier, a diode (7) coupled in anti-parallel relationship with the switching device (6), and a circuit (17; 117, 118) for driving the switching device into conduction at a controlled frequency. Further provided is a transformer (14) which derives a low-frequency energy from the AC mains supply (1). A second coil (9) is electromagnetically coupled with the heating coil (4) for deriving a high-frequency energy. The low- and high-frequency energies are coupled by diodes (10, 11, 15, 16; 132, 133) to the driving circuit to provide power necessary to effect the conduction of the switching device.

REFERENCES:
patent: 3686558 (1972-08-01), Havas et al.
patent: 3742179 (1973-06-01), Harnden, Jr.
patent: 4115676 (1978-09-01), Higuchi et al.
patent: 4210827 (1980-07-01), Kanazawa et al.
patent: 4277667 (1981-07-01), Kiuchi
patent: 4317975 (1982-03-01), Mizukawa et al.
patent: 4334135 (1982-06-01), Smith
patent: 4356371 (1982-10-01), Kiuchi et al.

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