Direct current modulator for providing variable double frequency

Details Direct current modulator for providing variable double frequency Direct current modulator for providing variable double frequency

1975-08-04

1977-05-24

Pellinen, A. D.

Electric heating

Microwave heating

Tunnel furnace

219 1075, 323 75S, 323 89B, H05B 506

Patent

active

040258645

ABSTRACT:
A direct current modulator provides double frequency variable A-C power to a load (such as an induction furnace or induction heater) specifically adapted to operate at the double frequency. The direct current modulator includes a saturable reactor bridge circuit having impedance balanced windings which function as magnetic valves. The windings are connected to provide first and second zero A-C potential terminals to which D-C magnetization current is connected. A source of D-C magnetization current is provided by a direct current circuit in which the modulated direct current flows. The direct current circuit includes the load, a rectifier and transformer connected to a source of A-C power. Capacitance and reactance may be provided in circuit with the load for bypassing the D-C component of the modulated D-C current which flows through the load. The direct current circuit including the rectifier and the transformer provides a low impedance path for the double frequency A-C component which modulates the D-C current in the D-C circuit. The direct current modulator provides variable A-C power at twice the source frequency through the load, the power being controlled as a direct function of the D-C current applied to the saturable bridge reactor circuit.

REFERENCES:
patent: 1745378 (1930-02-01), Osnos
patent: 2414317 (1947-01-01), Middel
patent: 2683854 (1954-07-01), Conrath
patent: 2827603 (1958-03-01), Fingerett et al.
patent: 2866943 (1958-12-01), Ringelman
patent: 2883505 (1959-04-01), Manwaring
patent: 2988730 (1961-06-01), Prywes
patent: 3538427 (1970-11-01), Oltendorf
H. F. Storm, "Magnetic Amplifiers", John Wiley & Sons, Inc., New York, 1955, pp. 112, 460-462.
Crow, "Saturating Core Devices", Edwards Bros. Inc., Ann Arbor, Mich., 1949, pp. 133, 134, 219, 220.

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