DC to polyphase inverter utilizing a plurality of switching device and a transformer having a plurality of primary and feedback windings connected in circuit with the switching device

Claim 2

A circuit for translating a DC input signal to polyphase time varying output signals, said circuit comprising: a transformer having a plurality of primary windings and a plurality of secondary windings; means for applying said DC input signal to each one of said primary windings; a plurality of switching devices, each of said devices being operated between an on and an off state of current conduction, each one of said switching devices being connected in circuit with a corresponding one of said plurality of primary windings; said transformer further having a plurality of feedback windings, each feedback winding being associated with a corresponding one of said primary windings, each feedback winding being connected in circuit with a corresponding one of said switching devices for providing a regenerative feedback signal in relation to the operation of said corresponding switching device; switch control means for controlling the state of current conduction of said plurality of switching devices, the conductive state of each one of said plurality of switching devices bearing a predetermined relationship one to another; and means associated with said plurality of secondary windings for developing said polyphase output signals.

Claim 3

A circuit for translating a DC input signal to polyphase time varying output signals, said circuit comprising: a transformer having a plurality of primary windings and a plurality of secondary windings; means for applying said DC input signal to each one of said primary windings; a plurality of switching devices, each of said devices being operated between an on and an off state of current conduction, each one of said switching devices being connected in circuit with a corresponding one of said plurality of primary windings; said transformer further having a plurality of feedback windings, each feedback winding being associated with a corresponding one of said primary windings, each feedback winding being connected in circuit with a corresponding one of said switching devices for providing a regenerative feedback signal in relation to the operation of said corresponding switching device; switch control means for controlling the state of current conduction of said plurality of switching devices, the conductive state of each one of said plurality of switching devices bearing a predetermined relationship one to another; and means associated with said plurality of secondary windings for developing said polyphase output signals.

Claim 4

A circuit for translating a DC input signal to polyphase time varying output signals, said circuit comprising: a transformer having a plurality of primary windings and a plurality of secondary windings; means for applying said DC input signal to each one of said primary windings; a plurality of switching devices, each of said devices being operated between an on and an off state of current conduction, each one of said switching devices being connected in circuit with a corresponding one of said plurality of primary windings; said transformer further having a plurality of feedback windings, each feedback winding being associated with a corresponding one of said primary windings, each feedback winding being connected in circuit with a corresponding one of said switching devices for providing a regenerative feedback signal in relation to the operation of said corresponding switching device; switch control means for controlling the state of current conduction of said plurality of switching devices, the conductive state of each one of said plurality of switching devices bearing a predetermined relationship one to another; and means associated with said plurality of secondary windings for developing said polyphase output signals.

Claim 5

The circuit according to claim 1 wherein said switch control means causes each of said switching devices to conduct current for an equal interval of time with respect to each other, the occurrence of said switching device current conduction time intervals bearing a predetermined relationship to each other.

Claim 6

The circuit according to claim 1 further comprising means associated with said switch control means for selectively controlling the time intervals of the current conduction states of each of said switching devices.

Claim 7

A circuit for translating a DC input signal to three phase time varying output signals, said circuit comprising: a transformer having three primary windings connected in a wye configuration and three secondary windings connected in a delta configuration; means for applying said DC input signal to each one of said primary windings; three switching devices, each of said devices being operated between an on and an off state of current conduction, each one of said switching devices being connected in circuit with a corresponding one of said primary windings; three switch drivers, each one being connected to a corresponding one of said switching devices for driving said corresponding switching devices between said on and off current conduction conditions; said transformer further having three feedback windings, each one of said feedback windings being associated with a corresponding one of said primary windings and being responsive to the current conduction through said corresponding primary winding, each one of said feedback windings being connected in circuit with a corresponding one of said switching devices and a corresponding one of said switch drivers for providing a regenerative feedback signal in relation to the operation of said corresponding switching device; driver control means for controlling the operation of said three switch drivers; said driver control means controlling said switch drivers such that each of said switching devices conducts current for a given time interval, the current conduction time interval associated with any one of said switching devices overlapping the time interval associated with any other switching device; and means associated with said secondary windings for developing said three phase output signals.

Claim 8

A circuit for translating a DC input signal to three phase time varying output signals, said circuit comprising: a transformer having three primary windings connected in a wye configuration and three secondary windings connected in a delta configuration; means for applying said DC input signal to each one of said primary windings; three switching devices, each of said devices being operated between an on and an off state of current conduction, each one of said switching devices being connected in circuit with a corresponding one of said primary windings; three switch drivers, each one being connected to a corresponding one of said switching devices for driving said corresponding switching devices between said on and off current conduction conditions; said transformer further having three feedback windings, each one of said feedback windings being associated with a corresponding one of said primary windings and being responsive to the current conduction through said corresponding primary winding, each one of said feedback windings being connected in circuit with a corresponding one of said switching devices and a corresponding one of said switch drivers for providing a regenerative feedback signal in relation to the operation of said corresponding switching device; driver control means for controlling the operation of said three switch drivers; said driver control means controlling said switch drivers such that each of said switching devices conducts current for a given time interval, the current conduction time interval associated with any one of said switching devices overlapping the time interval associated with any other switching device; and means associated with said secondary windings for developing said three phase output signals.

Claim 9

The circuit according to claim 4 further comprising means associated with said driver control means for selectively controlling the time intervals of the current conduction states of each of said switching devices.

Claim 10

The circuit according to claim 5 wherein said driver control means comprises a means for Generating three gating pulses one on each of three lines with each gating pulse being offset in time one from another, each one of said three lines being connected to a corresponding one of said switch driver transistors.

Claim 11

A circuit for translating a DC input signal to three phase time varying output signals, said circuit ccomprising: a transformer having three primary windings connected in a wye configuration and three secondary windings connected in a delta configuration; means for applying said DC input signal between the center point of said wye configuration and a point of reference potential; three switching circuits, each one of said switching circuits being connected between one end of one of said primary windings and said point of reference potential, each switching circuit comprising: a. a switching transistor having two main electrodes and a control electrode, one main electrode thereof connected to said one end of said primary windings, the other main electrode thereof being connected to said point of reference potential, said switching transistor being operated between a saturated state and a cut-off state of current conduction; b. a feedback winding, said feedback winding being transformer coupled to the corresponding primary winding, one end of said feedback winding being resistively connected to said point of reference potential; and c. a driver transistor having two main electrodes and a control electrode, one main electrode thereof being connected to the other end of said feedback winding, the other main electrode thereof being connected to the control electrode of said switching transistor; driver control means for providing gating pulses to the control electrodes of the driver transistors in each of said three switching circuits; and means associated with said secondary windings for developing said three phase output signals.

Claim 12

A circuit for translating a DC input signal to three phase time varying output signals, said circuit ccomprising: a transformer having three primary windings connected in a wye configuration and three secondary windings connected in a delta configuration; means for applying said DC input signal between the center point of said wye configuration and a point of reference potential; three switching circuits, each one of said switching circuits being connected between one end of one of said primary windings and said point of reference potential, each switching circuit comprising: a. a switching transistor having two main electrodes and a control electrode, one main electrode thereof connected to said one end of said primary windings, the other main electrode thereof being connected to said point of reference potential, said switching transistor being operated between a saturated state and a cut-off state of current conduction; b. a feedback winding, said feedback winding being transformer coupled to the corresponding primary winding, one end of said feedback winding being resistively connected to said point of reference potential; and c. a driver transistor having two main electrodes and a control electrode, one main electrode thereof being connected to the other end of said feedback winding, the other main electrode thereof being connected to the control electrode of said switching transistor; driver control means for providing gating pulses to the control electrodes of the driver transistors in each of said three switching circuits; and means associated with said secondary windings for developing said three phase output signals.

Claim 13

The circuit according to claim 7 wherein said driver control means includes a clock signal generator having an adjustable signal frequency.

Claim 14

The circuit according to claim 7 wherein the gating pulses provided by said driver control means are of equal time intervals but offset in time one from another.

Claim 15

The circuit according to claim 7 further comprising a protective diode connected in circuit with said one end of said feedback winding.