AC Line voltage regulator with controlled energy dispenser

DETAILED DESCRIPTION The present invention is an apparatus for regulating an oscillating AC voltage, the apparatus having an input port for connecting to a source of sinusoidal AC line voltage and an output port for delivering an output sinusoidal AC voltage and a current to a load.
A voltage sensing circuit is provided which is responsive to the level of either the line or output voltages for measuring the difference between the level of the sensed voltage and a preselected voltage level.
The voltage sensing circuit provides signals which are representative of the difference.
An activation circuit responds to the difference signal by providing an activation signal at a time which is determined by the difference signal.
The activation signal stimulates an energy dispensing circuit, when the sensed voltage level differs from the predetermined level, to dispense energy into an oscillatory circuit which oscillates with the sensed voltage and which is connected between the input and output ports of the regulator.
The dispensing circuit is selectively switched by the activation signal to dispense energy into the oscillatory circuit in such a direction as to either buck or boost the line voltage.
The direction of energy dispensing is determined by a polarity characteristic of the voltage difference signal, and the amount of energy dispensed is determined by the magnitude of the voltage difference, both of which are indicated by the activation signal.
The adjustment of the oscillation level in the oscillatory circuit in turn adjusts the level of voltage between the regulator ports and, thereby, the sensed voltage level.
A load current sensing circuit responds to a load current which flows between the regulator ports by producing a level signal representative of the magnitude of the load current.
The current level signal is fed to the activation circuit where it is combined with the voltage difference signal to change the time when the activation signal is provided to the dispensing circuit.
The change of time of the activation signal correspondingly changes the amount of energy provided by the energy dispenser to account for the effect of the load current on the level of oscillatory circuit oscillation