Compensated ramp generating circuit for controlling SCR firing

Details Compensated ramp generating circuit for controlling SCR firing Compensated ramp generating circuit for controlling SCR firing

1983-09-14

1985-10-08

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

323242, 323326, 307263, H02P 1326

Patent

active

045464243

ABSTRACT:
Ramp generating circuits, for synchronizing SCR firing control signals to the phase-varying signals derived from a three-phase AC power source, each have a compensating circuit connected across an operational amplifier and a capacitor to control the peak value of the ramp signal generated at the output of the operational amplifier. The compensating circuit maintains the peak value of the ramp signal close to its calculated value despite variations in the actual value of the capacitor from its nominal or rated value and despite changes in power line frequency between 50 hertz and 60 hertz. The compensating circuit includes a T-section passive network, a voltage-following amplifier and several feedback resistors connected from the output of the operational amplifier to its inverting (-) input. This compensating circuit increases or decreases charging current to the capacitor according to the type of compensation that is necessary.

REFERENCES:
patent: 4268794 (1981-05-01), Handte et al.
patent: 4438466 (1984-03-01), Fawkes et al.
SWEO Engineering, Inc., Ramp Generating Circuit, 1981 as disclosed in Exhibit A.
"Thyristor Control Theory", General Electric Company Manual, circa. 1980, pp. 97-101.

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