SCR firing circuit for high voltage control applications

Details SCR firing circuit for high voltage control applications SCR firing circuit for high voltage control applications

1996-11-04

1999-02-16

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Utilizing three or more electrode solid-state device

327456, 327461, 327473, H03K 17725

Patent

active

058724788

ABSTRACT:
An SCR firing circuit is provided which includes a plurality of opto-couplers, diodes, a capacitor and an SCR, utilized to control the AC power applied to a load, such as a vibratory feeder. In various embodiments of the invention, one or more opto-couplers act as solid state switches and also isolate a control signal from the AC line voltage. The capacitor is charged from an AC power source through the diode during a half cycle of the AC line voltage, and remains charged until the SCR is triggered. In response to a control signal rendering the opto-couplers conductive, the capacitor is discharged through the opto-couplers to fire the SCR and provide AC power to the load. A back-to-back SCR firing circuit is also provided which fires a first SCR when a line voltage is positive and which fires a second SCR when the line voltage is negative, which may be utilized to adjust the frequency of the application of power to the load independently of the frequency of the AC power supply.

REFERENCES:
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patent: 4048520 (1977-09-01), Muskovac et al.
patent: 4489372 (1984-12-01), Hatano et al.
patent: 4631472 (1986-12-01), McCollum et al.
patent: 4675543 (1987-06-01), Mitsuoka
patent: 4716511 (1987-12-01), Masaki
patent: 4801828 (1989-01-01), Ishikawa et al.
Motorola Inc. Motorola Optoelectronic Device Data, 1983, pp. 3-65, 3-66.

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