Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values

GPHYSICS G05Controlling systems G05FSYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES

G05F1/00Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values

G05F1/02Regulating electric characteristics of arcs G05F1/04by means of saturable magnetic devices G05F1/06by means of discharge tubes G05F1/08by means of semiconductor devices G05F1/10Regulating voltage or current G05F1/12wherein the variable actually regulated by the final control device is ac G05F1/13using ferroresonant transformers as final control device G05F1/14using tap transformers or tap changing inductors as final control device G05F1/147with motor driven tap switch G05F1/153controlled by discharge tubes or semiconductor devices G05F1/16combined with discharge tubes or semiconductor devices G05F1/20semiconductor devices only G05F1/22combined with separate magnetic control devices having a controllable degree of saturation G05F1/24using bucking or boosting transformers as final control devices G05F1/247with motor in control circuit G05F1/253the transformers including plural windings in series between source and load G05F1/26combined with discharge tubes or semiconductor devices G05F1/30semiconductor devices only G05F1/32using magnetic devices having a controllable degree of saturation as final control devices G05F1/325with specific core structure G05F1/33with plural windings through which current to be controlled is conducted G05F1/335on different cores G05F1/34combined with discharge tubes or semiconductor devices G05F1/38semiconductor devices only G05F1/40using discharge tubes or semiconductor devices as final control devices G05F1/42discharge tubes only G05F1/44semiconductor devices only G05F1/445being transistors in series with the load G05F1/45being controlled rectifiers in series with the load G05F1/452with pulse-burst modulation control G05F1/455with phase control G05F1/46wherein the variable actually regulated by the final control device is dc G05F1/461using an operational amplifier as final control device G05F1/462as a function of the requirements of the load G05F1/463Sources providing an output which depends on temperature G05F1/465Internal voltage generators for integrated circuits G05F1/466Sources with reduced influence on propagation delay G05F1/467Sources with noise compensation G05F1/468characterised by reference voltage circuitry G05F1/52using discharge tubes in series with the load as final control devices G05F1/54additionally controlled by the unregulated supply G05F1/56using semiconductor devices in series with the load as final control devices G05F1/561Voltage to current converters G05F1/562with a threshold detection shunting the control path of the final control device G05F1/563including two stages of regulation at least one of which is output level responsive G05F1/565sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system G05F1/567for temperature compensation G05F1/569for protection G05F1/571with overvoltage detector G05F1/573with overcurrent detector G05F1/5735with foldback current limiting G05F1/575characterised by the feedback circuit G05F1/577for plural loads G05F1/585providing voltages of opposite polarities G05F1/59including plural semiconductor devices as final control devices for a single load G05F1/595semiconductor devices connected in series G05F1/607using discharge tubes in parallel with the load as final control devices G05F1/61including two stages of regulation, at least one of which is output level responsive G05F1/613using semiconductor devices in parallel with the load as final control devices G05F1/614including two stages of regulation, at least one of which is output level responsive G05F1/618using semiconductor devices in series and in parallel with the load as final control devices G05F1/62using bucking or boosting dc sources G05F1/625wherein it is irrelevant whether the variable actually regulated is ac or dc G05F1/63using variable impedances in series with the load as final control devices G05F1/635being Hall effect devices, magnetoresistors or thermistors G05F1/644being pressure-sensitive resistors G05F1/648being plural resistors among which a selection is made G05F1/652using variable impedances in parallel with the load as final control devices G05F1/656using variable impedances in series and in parallel with the load as final control devices G05F1/66Regulating electric power G05F1/67to the maximum power available from a generator G05F1/70Regulating power factor Regulating reactive current or power