Power control system

Details Power control system Power control system

1977-11-30

1980-12-09

Pellinen, A. D.

Electricity: power supply or regulation systems

Remote sensing

307228, 323 21, 323 34, 323 75F, G05F 1455

Patent

active

042387230

ABSTRACT:
A system for controlling AC power for any load in which it is desired to limit and/or specifically program current at least for an initial period. SCR switches are employed, these being controlled as to angle of conduction out of the 180 degrees of each AC half cycle. The positive and negative half cycles are separated in a diode bridge and are separately handled throughout to the SCR's, which are connected two in parallel, in opposing polarity per phase. Voltage ramps are generated for each half cycle and a comparison circuit acts as a pick-off to start the SCR gate at a point in the half cycle determined by the comparator reference, the latter being the independent control. Fast turn-on leading edge spikes on the SCR gates are provided to minimize SCR di/dt stress.

REFERENCES:
patent: 2682640 (1954-06-01), Harling
patent: 3697777 (1972-10-01), Donoghue
patent: 3706913 (1972-12-01), Malatchi
patent: 4023122 (1977-05-01), Oura
patent: 4068157 (1978-01-01), Bassett
patent: 4117392 (1978-09-01), Kintigh et al.
Electronics, Mar. 4, 1976, pp. 112-114.
Instruments & Control Systems, Dec. 1972, p. 48.

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