Phase displaced, multiple inverter bridge circuits with waveform notching for harmonic elimination

Claim 2

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching means providing notching in the pole voltage every half cycle between 0 degrees to 45 degrees and 135 degrees to 180 degrees, at least two notches between 0 degrees and 45 degrees, and at least two notches between 135 degrees and 180 degrees.

Claim 3

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching means providing two notches in the pole voltage every half cycle between 0 degrees to 45 degrees and 135 degrees to 180 degrees, a first notch beginning at 0 degrees and a second notch ending at 180 degrees.

Claim 4

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching means providing two notches in the pole voltage every half cycle between 0 degrees to 45 degrees and 135 degrees to 180 degrees, a first notch beginning at 0 degrees and a second notch ending at 180 degrees.

Claim 5

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching means providing notching in the pole voltage every half cycle, at least two notches between 0 degrees and 45 degrees, and at least two notches between 135 degrees and 180 degrees.

Claim 6

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching means providing notching in the pole voltage every half cycle, at least two notches between 0 degrees and 45 degrees, and at least two notches between 135 degrees and 180 degrees.

Claim 7

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said transformer means includes phase shifting at least one of the waveform outputs of said inverter bridge circuits, and said switching means providing notching in the pole voltage every half cycle, at least two notches between 0 degrees and 45 degrees, and at least two notches between 135 degrees and 180 degrees.

Claim 8

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said transformer means includes phase shifting at least one of the waveform outputs of said inverter bridge circuits, and said switching means providing notching in the pole voltage every half cycle, at least two notches between 0 degrees and 45 degrees, and at least two notches between 135 degrees and 180 degrees.

Claim 9

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said transformer means includes phase shifting at least one of the waveform outputs of said inverter bridge circuits, and said switching means providing two notches in the pole voltage every half cycle, a first notch beginning at 0 degrees and a second notch ending at 180 degrees.

Claim 10

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said transformer means includes phase shifting at least one of the waveform outputs of said inverter bridge circuits, and said switching means providing two notches in the pole voltage every half cycle, a first notch beginning at 0 degrees and a second notch ending at 180 degrees.

Claim 11

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said transformer means includes phase shifting at least one of the waveform outputs of said inverter bridge circuits, said switching means providing notching in the pole voltage in every half cycle between 0 degrees to 45 degrees and 135 degrees to 180 degrees.

Claim 12

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said transformer means includes phase shifting at least one of the waveform outputs of said inverter bridge circuits, said switching means providing notching in the pole voltage in every half cycle between 0 degrees to 45 degrees and 135 degrees to 180 degrees.

Claim 13

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said transformer means includes phase shifting at least one of the waveform outputs of said inverter bridge circuits, said switching means providing notching in the pole voltage in every half cycle between 0 degrees to 45 degrees and 135 degrees to 180 degrees, said switching means is controllable to provide notching in the pole voltage every half cycle, at least two notches between 0 degrees and 45 degrees, and at least two notches between 135 degrees and 180 degrees.

Claim 14

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said transformer means includes phase shifting at least one of the waveform outputs of said inverter bridge circuits, said switching means providing notching in the pole voltage in every half cycle between 0 degrees to 45 degrees and 135 degrees to 180 degrees, said switching means is controllable to provide notching in the pole voltage every half cycle, at least two notches between 0 degrees and 45 degrees, and at least two notches between 135 degrees and 180 degrees.

Claim 15

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching means providing two notches in the pole voltage per half cycle, one notch between 0 degrees and 45 degrees, and one notch between 135 degrees and 180 degrees, said notching of the pole voltage is used to reduce harmonics and said single AC voltage waveform is used to control the lead and lag reactive currents of an AC power system.

Claim 16

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching means providing two notches in the pole voltage per half cycle, one notch between 0 degrees and 45 degrees, and one notch between 135 degrees and 180 degrees, said notching of the pole voltage is used to reduce harmonics and said single AC voltage waveform is used to control the lead and lag reactive currents of an AC power system.

Claim 17

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching means providing notching in the pole voltage every half cycle, at least two notches between 0 degrees and 45 degrees, and at least two notches between 135 degrees and 180 degrees, said notching of the pole voltage is used to reduce harmonics and said single AC voltage waveform is used to control the lead and lag reactive currents of an AC power system.

Claim 18

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching means providing notching in the pole voltage every half cycle, at least two notches between 0 degrees and 45 degrees, and at least two notches between 135 degrees and 180 degrees, said notching of the pole voltage is used to reduce harmonics and said single AC voltage waveform is used to control the lead and lag reactive currents of an AC power system.

Claim 19

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching means providing two notches in the pole voltage every half cycle, a first notch beginning at 0 degrees and a second notch ending at 180 degrees, said notching of the pole voltage is used to reduce harmonics and said single AC voltage waveform is used to control the lead and lag reactive currents of an AC power system.

Claim 20

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching means providing two notches in the pole voltage every half cycle, a first notch beginning at 0 degrees and a second notch ending at 180 degrees, said notching of the pole voltage is used to reduce harmonics and said single AC voltage waveform is used to control the lead and lag reactive currents of an AC power system.

Claim 21

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits having two six-pulse inverter bridge circuits, the first displaced at 15 degrees, and the second displaced at 165 degrees; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching means providing a pole voltage notch positioned between 16 degrees and 23 degrees, and a notch between 157 degrees and 164 degrees in every half cycle.

Claim 22

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits having two six-pulse inverter bridge circuits, the first displaced at 15 degrees, and the second displaced at 165 degrees; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching means providing a pole voltage notch positioned between 16 degrees and 23 degrees, and a notch between 157 degrees and 164 degrees in every half cycle.

Claim 23

The three-phase power inverter of claim 11 wherein said transformer means includes a wye-wye transformer.

Claim 24

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits having two six-pulse inverter bridge circuits, the first displaced at 15 degrees, and the second displaced at 165 degrees; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching means providing notching of the pole voltage every half cycle at 16.245 degrees to 22.065 degrees, and at 157.935 degrees to 163.755 degrees.

Claim 25

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits having two six-pulse inverter bridge circuits, the first displaced at 15 degrees, and the second displaced at 165 degrees; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching means providing notching of the pole voltage every half cycle at 16.245 degrees to 22.065 degrees, and at 157.935 degrees to 163.755 degrees.

Claim 26

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits having two six-pulse inverter bridge circuits, the first displaced at 15 degrees, and the second displaced at 165 degrees; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching means providing notches located on every half cycle between the following ranges: 10 degrees to 17 degrees; 30 degrees to 33 degrees; 147 degrees to 150 degrees; and 163 degrees to 170 degrees.

Claim 27

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits having two six-pulse inverter bridge circuits, the first displaced at 15 degrees, and the second displaced at 165 degrees; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching means providing notches located on every half cycle between the following ranges: 10 degrees to 17 degrees; 30 degrees to 33 degrees; 147 degrees to 150 degrees; and 163 degrees to 170 degrees.

Claim 28

The three-phase power inverter of claim 14 wherein said transformer means includes a wye-wye transformer.

Claim 29

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits having two six-pulse inverter bridge circuits, the first displaced at 15 degrees, and the second displaced at 165 degrees; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching means providing notching the pole voltage every half cycle at 10.55 degrees to 16.09 degrees, and 30.90 degrees to 32.87 degrees, and 147.13 degrees to 149.91 degrees, and 163.91 degrees to 169.45 degrees.

Claim 30

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits having two six-pulse inverter bridge circuits, the first displaced at 15 degrees, and the second displaced at 165 degrees; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching means providing notching the pole voltage every half cycle at 10.55 degrees to 16.09 degrees, and 30.90 degrees to 32.87 degrees, and 147.13 degrees to 149.91 degrees, and 163.91 degrees to 169.45 degrees.

Claim 31

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits having four six-pulse inverter bridge circuits having the first displaced by 7.5 degrees, the second by 172.5 degrees, the third by 37.5 degrees, and the fourth by 202.5 degrees; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching circuit providing a notch in the pole voltage every half cycle located in the ranges from 8 degrees to 12 degrees, and from 169 degrees to 172 degrees.

Claim 32

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits having four six-pulse inverter bridge circuits having the first displaced by 7.5 degrees, the second by 172.5 degrees, the third by 37.5 degrees, and the fourth by 202.5 degrees; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching circuit providing a notch in the pole voltage every half cycle located in the ranges from 8 degrees to 12 degrees, and from 169 degrees to 172 degrees.

Claim 33

The three-phase power inverter of claim 17 wherein said transformer means includes a wye-wye transformer connected to the outputs of said first and second inverters, bridge circuits, and a wye-delta transformer connected to the outputs of said third and fourth inverter bridge circuits.

Claim 34

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits having four six-pulse inverter bridge circuits having the first displaced by 7.5 degrees, the second by 172.5 degrees, the third by 37.5 degrees, and the fourth by 202.5 degrees; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching circuit providing a notch from 8.26 degrees to 11 degrees, and from 169 degrees to 171.74 degrees in every half cycle.

Claim 35

A three-phase power inverter for reducing undesired harmonics of a fundamental AC output comprising: means for providing a DC voltage; at least two inverter bridge circuits having four six-pulse inverter bridge circuits having the first displaced by 7.5 degrees, the second by 172.5 degrees, the third by 37.5 degrees, and the fourth by 202.5 degrees; said inverter bridge circuits having switching means controllable to provide a notched pole voltage waveform output; said inverter bridge circuits having their respective outputs phase displaced; and transformer means connected to the respective outputs of said inverter bridges for combining said respective outputs into a single AC voltage waveform, said switching circuit providing a notch from 8.26 degrees to 11 degrees, and from 169 degrees to 171.74 degrees in every half cycle.