Current feed control circuit and electronic appliance using the

Details Current feed control circuit and electronic appliance using the Current feed control circuit and electronic appliance using the

1997-08-08

2000-12-12

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Utilizing three or more electrode solid-state device

327520, 323300, H03K 1772

Patent

active

061604399

ABSTRACT:
The constitution includes a heater 2 used as current receiving element, a thyristor 3 placed in the current travelling route of the heater 2, a series connection circuit of a capacitor 4 and diode 5 for control power source connected parallel to the thyristor 3, a Zener diode 9 as a constant voltage element connected to the gate of the thyristor 3, and a control circuit 6 connected parallel to the capacitor 4, with its control terminal connected to the gate of the thyristor 3, whereby a specified control voltage determined by the Zener voltage of the Zener diode 9 is obtained at the first capacitor 4 by the control of the thyristor 3, so that the transformer for stepping down the supply voltage is not necessary.

REFERENCES:
patent: 3939394 (1976-02-01), Suzuki
patent: 4300090 (1981-11-01), Weber
patent: 4480197 (1984-10-01), Hollaway
patent: 4603289 (1986-07-01), McLellan
patent: 4878010 (1989-10-01), Weber

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