COMPENSATED RAMP GENERATING CIRCUIT FOR CONTROLLING SCR FIRING

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 out...

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Bibliographische Detailangaben
1. Verfasser:	NOLAN, DENNIS C
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROL OR REGULATION THEREOF CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	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.