Time ratio solid state voltage regulator

Claim 2

An alternating current adjustable output voltage circuit connected between input and output terminals including a plurality of bidirectional conducting solid state switching means and at least one voltage-injecting winding, and coupling means for connecting said solid state switching means to fixed points on said voltage-injecting winding and for effectively inserting said winding in series with one output terminal and removing said winding from the circuit to thereby selectively inject full value and zero voltage increments in series with the input voltage to change the output voltage, characterized by time ratio means for synchronously switching said bidirectional solid state switching means, said time ratio means including means for continuously producing a base time interval that is an integral number of half cycles of the input voltage and further including means for effectively inserting said voltageinjecting winding in series with the output terminal for a variable number of half cycles of each base time interval, whereby over the base time interval a selected portion of the full value voltage increment is injected in series with the input voltage, wherein said circuit includes one voltage-injecting stage comprising a voltage-injecting winding and solid state switching means operated according to time ratio principles to inject a variable portion of the full value voltage increment when averaged over the base time interval and another voltageinjecting stage that is operated to selectively inject only a full value voltage increment and a zero value voltage increment over the entire base interval.

Claim 3

A circuit according to claim 1 wherein said adjustable output voltage circuit is a step voltage regulator constructed with solid state switches.

Claim 4

A circuit according to claim 1 wherein said adjustable output voltage circuit is a load tap changing transformer constructed with solid state switches.

Claim 5

In a solid state voltage regulator connected between input and output terminals including a plurality of bidirectional conducting solid state switching means and at least one voltage-injecting transformer stage having a shunt exciting winding and an inductively coupled secondary winding, and coupling means for connecting said solid state switching means to fixed points on said secondary winding and for effectively inserting said secondary winding in series with one output terminal and for removing said secondary winding from the circuit to selectively inject full value and zero voltage increments synchronously in series with the input voltage to change the output voltage, the improVement which comprises a time ratio synchronous gating circuit for said solid state switching means, said time ratio synchronous gating circuit including means for continuously producing a base time interval that is an integral number of half cycles of the input voltage and further including means for effectively inserting said secondary winding in series with the output terminal for a variable number of half cycles of each base time interval, whereby over the base time interval a selected portion of the full value voltage increment is injected in series with the input voltage, said circuit comprising one voltage-injecting transformer stage operated according to time ratio principles to inject a variable portion of the full value voltage increment when averaged over the base time interval and another voltage-injecting transformer stage operated to selectively inject only a full value voltage increment and a zero value voltage increment over the entire base time interval.

Claim 6

In a solid state voltage regulator connected between input and output terminals including a plurality of bidirectional conducting solid state switching means and at least one voltage-injecting transformer stage having a shunt exciting winding and an inductively coupled secondary winding, and coupling means for connecting said solid state switching means to fixed points on said secondary winding and for effectively inserting said secondary winding in series with one output terminal and for removing said secondary winding from the circuit to selectively inject full value and zero voltage increments synchronously in series with the input voltage to change the output voltage, the improVement which comprises a time ratio synchronous gating circuit for said solid state switching means, said time ratio synchronous gating circuit including means for continuously producing a base time interval that is an integral number of half cycles of the input voltage and further including means for effectively inserting said secondary winding in series with the output terminal for a variable number of half cycles of each base time interval, whereby over the base time interval a selected portion of the full value voltage increment is injected in series with the input voltage, said circuit comprising one voltage-injecting transformer stage operated according to time ratio principles to inject a variable portion of the full value voltage increment when averaged over the base time interval and another voltage-injecting transformer stage operated to selectively inject only a full value voltage increment and a zero value voltage increment over the entire base time interval.

Claim 7

A circuit according to claim 4 wherein said time ratio synchronous gating circuit is operative to effectively insert said secondary winding in the circuit for a variable number of complete cycles of the base time interval.

Claim 8

An alternating current adjustable output voltage circuit connected between input and output terminals including a voltage-injecting transformer having a shunt exciting winding and an inductively coupled secondary winding, a pair of bidirectional conducting solid state switches respectively connected to fixed spaced points on said secondary winding, and coupling means for effectively inserting said secondary winding in series with one output terminal and for removing said secondary winding from the circuit to selectively inject full value and zero voltage increments synchronously in series with the input voltage to change the output voltage, characterized by a time ratio synchronous gating circuit for said solid state switches including means for continuously producing a base time interval that is an integral number of half cycles of the input voltage and further including means for effectively inserting said secondary winding in series with the output terminal for a variable number of half cycles of each base time interval, said time ratio synchronous gating circuit being operative to insert a selected fractional portion of the full value voltage increment in series with the input voltage when averaged over each base time interval in addition to the full value and zero voltage increments.

Claim 9

An alternating current adjustable output voltage circuit connected between input and output terminals including a voltage-injecting transformer having a shunt exciting winding and an inductively coupled secondary winding, a pair of bidirectional conducting solid state switches respectively connected to fixed spaced points on said secondary winding, and coupling means for effectively inserting said secondary winding in series with one output terminal and for removing said secondary winding from the circuit to selectively inject full value and zero voltage increments synchronously in series with the input voltage to change the output voltage, characterized by a time ratio synchronous gating circuit for said solid state switches including means for continuously producing a base time interval that is an integral number of half cycles of the input voltage and further including means for effectively inserting said secondary winding in series with the output terminal for a variable number of half cycles of each base time interval, said time ratio synchronous gating circuit being operative to insert a selected fractional portion of the full value voltage increment in series with the input voltage when averaged over each base time interval in addition to the full value and zero voltage increments.

Claim 10

A circuit according to claim 6 wherein said coupling means includes a series transformer having a primary winding connected in series with the output terminal and an inductively coupled secondary winding effectively connected in series with said voltage-injecting transformer secondary winding by operation of said solid state switches.

Claim 11

A circuit according to claim 6 wherein said time ratio synchronous gating circuit effectively inserts said voltage-injecting transformer secondary winding in the circuit for a variable number of complete cycles of the base time interval.