Regulated cycloconverter

Claim 2

A power supply including a high frequency generator for producing alternating current in excess of the frequency of a prime power source, a cycloconverter circuit coupled to said high frequency generator and comprising a transformer having a primary winding and a center tapped secondary winding providing an output terminal, a reactor having its winding center tapped to provide another output terminal, a first pair of SCR''s having one coupled from each end of the secondary winding to a corresponding end of said reactor, a second pair of SCR''s having one coupled from each end of said secondary winding to the opposite end of said reactor, means for switching the polarity of said reactor for providing a zero output signal across the center tapped output terminal of said reactor and the center tapped output terminal of said transformer notwithstanding continued conduction of said first pair and said second pair of SCR''s, and means for progressively triggering said first pair and said second pair of SCR''s in excess of the frequency of said high frequency generator in response to a reference voltage waveshape to program current flow through said reactor from said secondary winding thereby to provide across said output terminals a lower frequency output which conforms to the waveshape of said reference voltage.

Claim 3

A regulated power supply including a cycloconverter circuit comprising a transformer having a primary winding adapted to be connected to a high frequency source, a secondary winding center tapped to provide a first output terminal, a reactor winding center tapped to provide a second output terminal, a first pair of semiconductor rectifiers having one coupled from each end of said secondary winding to a corresponding end of said reactor winding, a second pair of semiconductor rectifiers having one coupled from each end of said secondary winding to the opposite end of said reactor winding and poled in a manner to provide zero output voltage across said first and second output terminals notwithstanding current flow through said reactor winding in response to conduction of said first pair and said second pair of semiconductor rectifiers, a source of reference voltage, and means in response to said reference voltage to trigger said first pair and said second pair of semiconductor rectifiers with respect to saiD high frequency source to provide at said first and second output terminals a replica of said reference voltage at a lower frequency than said high frequency source.

Claim 4

A regulated power supply including a cycloconverter circuit comprising a transformer having a primary winding adapted to be connected to a high frequency source, a secondary winding center tapped to provide a first output terminal, a reactor winding center tapped to provide a second output terminal, a first pair of semiconductor rectifiers having one coupled from each end of said secondary winding to a corresponding end of said reactor winding, a second pair of semiconductor rectifiers having one coupled from each end of said secondary winding to the opposite end of said reactor winding and poled in a manner to provide zero output voltage across said first and second output terminals notwithstanding current flow through said reactor winding in response to conduction of said first pair and said second pair of semiconductor rectifiers, a source of reference voltage, and means in response to said reference voltage to trigger said first pair and said second pair of semiconductor rectifiers with respect to saiD high frequency source to provide at said first and second output terminals a replica of said reference voltage at a lower frequency than said high frequency source.

Claim 5

A regulated power supply including a cycloconverter circuit comprising a transformer having a primary winding adapted to be connected to a high frequency source, a secondary winding center tapped to provide a first output terminal, a reactor winding center tapped to provide a second output terminal, a first pair of semiconductor rectifiers having one connected from each end of said secondary winding to a corresponding end of said reactor winding, a second pair of semiconductor rectifiers having one coupled from each end of said secondary winding to the opposite end of said reactor winding, said first pair and second pair of semiconductor rectifiers poled in a manner to provide unidirectional current flow through said reactor winding in a direction to provide a zero output across said first and second output terminals determined by the order of conduction of said first pair and said second pair of semiconductor rectifiers, means to trigger said first pair and said second pair of semiconductor rectifiers to provide at said output terminals an output voltage at a lower frequency than said high frequency source, and means in response to said output voltage to provide a control voltage to trigger said first pair and said second pair of semiconductor rectifiers in a sequence to regulate said output voltage with respect to variations in said high frequency source.

Claim 6

A regulated power supply including a cycloconverter circuit comprising a transformer having a primary winding adapted to be connected to a high frequency source, a secondary winding center tapped to provide a first output terminal, a reactor winding center tapped to provide a second output terminal, a first pair of semiconductor rectifiers having one connected from each end of said secondary winding to a corresponding end of said reactor winding, a second pair of semiconductor rectifiers having one coupled from each end of said secondary winding to the opposite end of said reactor winding, said first pair and second pair of semiconductor rectifiers poled in a manner to provide unidirectional current flow through said reactor winding in a direction to provide a zero output across said first and second output terminals determined by the order of conduction of said first pair and said second pair of semiconductor rectifiers, means to trigger said first pair and said second pair of semiconductor rectifiers to provide at said output terminals an output voltage at a lower frequency than said high frequency source, and means in response to said output voltage to provide a control voltage to trigger said first pair and said second pair of semiconductor rectifiers in a sequence to regulate said output voltage with respect to variations in said high frequency source.

Claim 7

A power supply including a cycloconverter circuit adapted to be connected to a high frequency source, a transformer having a center tapped secondary winding inductively coupled to said high frequency source, a reactor winding center tapped to provide an output terminal, a first pair of semiconductor switches having one in circuit with each end of said secondary winding and a corresponding end of said reactor winding, a second pair of semiconductor switches having one coupled from each end of said secondary winding to the opposite end of said reactor winding, means for initiating conduction in said first pair and said second pair of semiconductor switches at a frequency in excess of the frequency of said high frequency source and independently thereof to provide in said reactor winding current flow providing an output voltage at the center tap of said reactor winding, nonconduction in said first pair and said second pair of semiconductor switches occurring during their natural recovery period whereby a variable load connected between the center tap of said reactor winding and the center tap of said secondary winding does not affect the commutation of any pair of semiconductor switches.

Claim 8

A power supply including a cycloconverter circuit adapted to be connected to a high frequency source, a transformer having a center tapped secondary winding inductively coupled to said high frequency source, a reactor winding center tapped to provide an output terminal, a first pair of semiconductor switches having one in circuit with each end of said secondary winding and a corresponding end of said reactor winding, a second pair of semiconductor switches having one coupled from each end of said secondary winding to the opposite end of said reactor winding, means for initiating conduction in said first pair and said second pair of semiconductor switches at a frequency in excess of the frequency of said high frequency source and independently thereof to provide in said reactor winding current flow providing an output voltage at the center tap of said reactor winding, nonconduction in said first pair and said second pair of semiconductor switches occurring during their natural recovery period whereby a variable load connected between the center tap of said reactor winding and the center tap of said secondary winding does not affect the commutation of any pair of semiconductor switches.

Claim 9

A regulated power supply including a cycloconverter circuit comprising a transformer having a primary winding adapted to be connected to a high frequency source, a secondary winding center tapped to provide a first output terminal, a reactor winding center tapped to provide a second output terminal, a first pair of SCR''s having one coupled from each end of said secondary winding to a corresponding end of said reactor winding, a second pair of SCR''s having one coupled from each end of said secondary winding to the opposite end of said reactor winding, means for sensing voltage variations across said output terminals, means in response to said voltage variations to provide a control signal to vary the order of conduction of said SCR''s in a manner to provide at said output terminals a voltage independent of the termination of conduction of said SCR''s which is compensated for voltage variation in said high frequency source.

Claim 10

A regulated power supply including a cycloconverter circuit comprising a transformer having a primary winding adapted to be connected to a high frequency source, a secondary winding center tapped to provide a first output terminal, a reactor winding center tapped to provide a second output terminal, a first pair of SCR''s having one coupled from each end of said secondary winding to a corresponding end of said reactor winding, a second pair of SCR''s having one coupled from each end of said secondary winding to the opposite end of said reactor winding, means for sensing voltage variations across said output terminals, means in response to said voltage variations to provide a control signal to vary the order of conduction of said SCR''s in a manner to provide at said output terminals a voltage independent of the termination of conduction of said SCR''s which is compensated for voltage variation in said high frequency source.

Claim 11

A cycloconverter comprising a transformer having a secondary winding coupled to a high frequency source, and center tapped to provide a first output terminal, a spanning reactor adapted to be fed by said secondary winding and center tapped to provide a second output terminal, a first pair of semiconductor switches hAving one coupled from each end of said spanning reactor to a corresponding end of said secondary winding, a second pair of semiconductor switches having one coupled from each end of said spanning reactor to the opposite end of said secondary winding, said first pair and said second pair of semiconductor switches polarized to provide a current flow in said spanning reactor to provide a zero output across said first and second output terminals notwithstanding continued conduction in either said first pair or said second pair of semiconductor switches, means for sensing the output voltage across said output terminals, means for comparing said sensed voltage with a reference voltage to provide a control voltage, means in response to said control voltage to trigger said first pair and said second pair of semiconductor switches in a predetermined sequence to proportionally control current flow from said high frequency source into said spanning reactor to reproduce at said output terminals an output waveform at a lower frequency than said high frequency source and having the shape of said reference waveform.

Claim 12

A cycloconverter comprising a transformer having a secondary winding coupled to a high frequency source, and center tapped to provide a first output terminal, a spanning reactor adapted to be fed by said secondary winding and center tapped to provide a second output terminal, a first pair of semiconductor switches hAving one coupled from each end of said spanning reactor to a corresponding end of said secondary winding, a second pair of semiconductor switches having one coupled from each end of said spanning reactor to the opposite end of said secondary winding, said first pair and said second pair of semiconductor switches polarized to provide a current flow in said spanning reactor to provide a zero output across said first and second output terminals notwithstanding continued conduction in either said first pair or said second pair of semiconductor switches, means for sensing the output voltage across said output terminals, means for comparing said sensed voltage with a reference voltage to provide a control voltage, means in response to said control voltage to trigger said first pair and said second pair of semiconductor switches in a predetermined sequence to proportionally control current flow from said high frequency source into said spanning reactor to reproduce at said output terminals an output waveform at a lower frequency than said high frequency source and having the shape of said reference waveform.

Claim 13

A cycloconverter as set forth in claim 6 in which said first pair and said second pair of semiconductor switches are SCR''s and are polarized to remain conducting during a portion of their operating cycle during zero output voltage from said first and second output terminals.

Claim 14

A power supply including a cycloconverter circuit adapted to be connected to a high frequency source, a transformer having a center tapped secondary winding forming an output terminal and inductively coupled to said high frequency source, a reactor winding center tapped to provide a second output terminal, a first pair of semiconductor switches having one in circuit with each end of said secondary winding and a corresponding end of said reactor winding, a second pair of semiconductor switches having one coupled from each end of said secondary winding to the opposite end of said reactor winding, and means to trigger said first pair and said second pair of semiconductor switches in a sequence which permits current flow in said reactor winding independent of termination of conduction of said semiconductor switches, whereby said output voltage at said output terminals is independent of the recovery time of said semiconductor switches.

Claim 15

A power supply including a cycloconverter circuit adapted to be connected to a high frequency source, a transformer having a center tapped secondary winding forming an output terminal and inductively coupled to said high frequency source, a reactor winding center tapped to provide a second output terminal, a first pair of semiconductor switches having one in circuit with each end of said secondary winding and a corresponding end of said reactor winding, a second pair of semiconductor switches having one coupled from each end of said secondary winding to the opposite end of said reactor winding, and means to trigger said first pair and said second pair of semiconductor switches in a sequence which permits current flow in said reactor winding independent of termination of conduction of said semiconductor switches, whereby said output voltage at said output terminals is independent of the recovery time of said semiconductor switches.

Claim 16

A regulated power supply including a cycloconverter circuit comprising a transformer having a center tapped secondary winding adapted to be inductively coupled to a high frequency source, a first pair of semiconductor switches, a center tapped reactor winding each end of which is coupled in series with a corresponding end of said secondary winding by means of one semiconductor switch of said first pair of semiconductor switches, a second pair of semiconductor switches having one coupled from each end of said secondary winding to the opposite end of said reactor winding, means for causing conduction in a predetermined sequence in said first pair and said second pair of semiconductor switches to provide an output voltage across output terminals formed by said center tapped reactor winding and said center tapped secondary winding which is independent of the recovery time of said semiconductor switches, whereby zero output voltage across said output terminals occurs during alternate conduction of said first pair and said second pair of semiconductor switches.

Claim 17

A regulated power supply including a cycloconverter circuit comprising a transformer having a center tapped secondary winding adapted to be inductively coupled to a high frequency source, a first pair of semiconductor switches, a center tapped reactor winding each end of which is coupled in series with a corresponding end of said secondary winding by means of one semiconductor switch of said first pair of semiconductor switches, a second pair of semiconductor switches having one coupled from each end of said secondary winding to the opposite end of said reactor winding, means for causing conduction in a predetermined sequence in said first pair and said second pair of semiconductor switches to provide an output voltage across output terminals formed by said center tapped reactor winding and said center tapped secondary winding which is independent of the recovery time of said semiconductor switches, whereby zero output voltage across said output terminals occurs during alternate conduction of said first pair and said second pair of semiconductor switches.

Claim 18

The cycloconverter circuit as set forth in claim 9 in which predetermined ones of said first pair and said second pair of said semiconductor switches are rendered conducting to control the direction of current flow in said reactor winding.

Claim 19

A cycloconverter circuit for providing a regulated output voltage independently of the time of conduction of semiconductor switches in the output circuit of said cycloconverter comprising a secondary winding inductively coupled to a source of high frequency, a reactor winding, a first pair of semiconductor switches having one coupled from each end of said reActor winding to said secondary winding in a manner adapted to control the flow of current through said reactor winding, a second pair of semiconductor switches having one coupled from each end of said secondary winding to the opposite end of said reactor winding, and means for regulating the conduction of said first pair and said second pair of semiconductor switches and current flow in said reactor winding for providing a zero output voltage at said output circuit notwithstanding conduction of said first pair and said second pair of semiconductor switches.

Claim 20

A cycloconverter circuit for providing a regulated output voltage independently of the time of conduction of semiconductor switches in the output circuit of said cycloconverter comprising a secondary winding inductively coupled to a source of high frequency, a reactor winding, a first pair of semiconductor switches having one coupled from each end of said reActor winding to said secondary winding in a manner adapted to control the flow of current through said reactor winding, a second pair of semiconductor switches having one coupled from each end of said secondary winding to the opposite end of said reactor winding, and means for regulating the conduction of said first pair and said second pair of semiconductor switches and current flow in said reactor winding for providing a zero output voltage at said output circuit notwithstanding conduction of said first pair and said second pair of semiconductor switches.

Claim 21

A cycloconverter circuit as set forth in claim 11 in which means is provided for sensing the output of said cycloconverter circuit and controlling the conduction sequence of said first pair and said second pair of semiconductor switches to provide a regulated output voltage.