Sine wave static inverter

Claim 2

A static inverter for providing a sine wave output signal comprising: pulse generating means for supplying at a plurality of output terminals a series of predetermined sequential output pulses; switching means receiving said output pulses for providing sequentially a first DC power supply at respective ones of a plurality of output terminals thereof; and sine wave-generating means receiving said supply at respective ones of a plurality of input terminals and having a transformer including multiple taps spaced on the primary winding respectively connected to said input terminals, and first, second aNd third spaced taps on the secondary winding of said transformer, said second tap being connected intermediate of said first and third taps, and filter means connected between said first and third taps for providing a sine wave output signal at said first and second taps.

Claim 3

A static inverter according to claim 1 wherein said filter means further comprises: a capacitor and inductor connected in parallel between said first and third taps with a resonance at the sine wave output frequency.

Claim 4

A static inverter according to claim 2 wherein said switching means further comprises: a first DC power supply means for providing said first DC power supply; a voltage regulator connected to receive said first DC power supply and said sine wave output signal for regulating the voltage of said first DC power supply in response to the magnitude of said sine wave output signal; and a plurality of transistors with input terminals operatively connected to said pulse-generating means output terminals and said voltage regulator for sequentially providing said first DC power supply at respective ones of said plurality of switching means output terminals.

Claim 5

A pulse generator according to claim 4 wherein said pulse-generating means further comprises: a second DC power supply means for providing a second DC power supply; a unijunction oscillator connected to receive said second DC power supply for providing pulse signals; a divider counter connected to receive said second DC power supply and said oscillator pulse signals for providing sequential binary signals; a plurality of NAND gates with each said NAND gate connected to receive said sequential binary signals and respectively providing spaced pulse output signals at a frequency of said oscillator pulse signals divided by the number of said NAND gates; a plurality of OR gates with each said OR gate operatively connected to receive said spaced output signals from a plurality of said NAND gates for supplying at a plurality of said pulse-generating means output terminals a series of predetermined sequential output pulses.

Claim 6

A static inverter for providing a sine wave output signal comprising: a pulse-generating means for supplying at a plurality of output terminals a series of predetermined sequential output pulses; switching means receiving said output pulses and having a first DC power supply means for providing a first DC power supply, a voltage regulator connected to receive said first DC power supply and a sine wave output signal for regulating the voltage of said first DC power supply in response to the magnitude of said sine wave output signal, a variable DC voltage supply connected to receive said first DC power supply for adjusting the voltage of said first DC power supply, a first plurality of transistors with input terminals operatively connected to said pulse-generating means output terminals and said voltage regulator for sequentially providing said first DC power supply at respective output terminals of said first plurality of transistors, and a second plurality of transistors with input terminals operatively connected to said pulse-generating means output terminals and said variable DC voltage supply for sequentially providing said first DC power supply at respective output terminals of second plurality of transistors; and sine wave-generating means receiving said DC supply having first and second transformers, said first and second transformers each include multiple taps spaced on the primary windings respectively connected to said input terminals, and two spaced taps on the secondary windings, said two spaced taps of said first transformer operatively connected to said two spaced taps of said second transformer so that signals generated by said first and second transformers are 180 * out of phase with each other, and a filter means having a capacitor and inductor connected in parallel between said first and second transformers two spaced taps with a resonance at the sine wave output frequency for providing the sine wave output signal at said first transformer.

Claim 7

A static inverter for providing a sine wave output signal comprising: a pulse-generating means for supplying at a plurality of output terminals a series of predetermined sequential output pulses; switching means receiving said output pulses and having a first DC power supply means for providing a first DC power supply, a voltage regulator connected to receive said first DC power supply and a sine wave output signal for regulating the voltage of said first DC power supply in response to the magnitude of said sine wave output signal, a variable DC voltage supply connected to receive said first DC power supply for adjusting the voltage of said first DC power supply, a first plurality of transistors with input terminals operatively connected to said pulse-generating means output terminals and said voltage regulator for sequentially providing said first DC power supply at respective output terminals of said first plurality of transistors, and a second plurality of transistors with input terminals operatively connected to said pulse-generating means output terminals and said variable DC voltage supply for sequentially providing said first DC power supply at respective output terminals of second plurality of transistors; and sine wave-generating means receiving said DC supply having first and second transformers, said first and second transformers each include multiple taps spaced on the primary windings respectively connected to said input terminals, and two spaced taps on the secondary windings, said two spaced taps of said first transformer operatively connected to said two spaced taps of said second transformer so that signals generated by said first and second transformers are 180 * out of phase with each other, and a filter means having a capacitor and inductor connected in parallel between said first and second transformers two spaced taps with a resonance at the sine wave output frequency for providing the sine wave output signal at said first transformer.

Claim 8

A pulse generator according to claim 5 wherein said pulse generating means further comprises: a second DC power supply means for providing a second DC power supply; a unijunction oscillator connected to receive said second DC power supply for providing pulse signals; a divider counter connected to receive said second DC power supply and said oscillator pulse signals providing sequential binary signals; a plurality of NAND gates with each said NAND gate connected to receive said sequential binary signals and respectively providing spaced pulse output signals at a frequency of said oscillator pulse signals divided by the number of said NAND gates; a plurality of OR gates with each said OR gate operatively connected to receive said spaced pulse output signals from a plurality of said NAND gates for supplying at a plurality of said pulse generating means output terminals a series of predetermined sequential output pulses.

Claim 9

A static inverter according to claim 6 further comprising: a harmonic analyzer connected to said first transformer secondary windings for sensing the presence of higher harmonics in said output sine wave signal.

Claim 10

A static inverter for providing a sine wave output signal comprising: pulse-generating means for supplying at a plurality of output terminals a series of predetermined sequential output pulses; switching means receiving said output pulses for providing sequentially a first DC power supply at respective ones of a plurality of output terminals thereof; and sine wave-generating means having first and second transformers with input terminals having multiple taps spaced on each transformer primary winding sequentially receiving said first DC power supply and two spaced taps on each transformer secondary winding, one secondary winding spaced tap of said first transformer operatively connected to one secondary winding spaced tap of said second transformer with a filter means for blocking a predetermined frequency and passing higher harmonics of the predetermined frequency connected therebetween, the other secondary winding spaced tap of said first transformer connected to the other secondary winding spaced tap of second transformer, the interconnection of said secondary windings spaced taps being so that signals generated by said first and second transformers are 180* out of phase with each other for providing a sine wave output signal.

Claim 11

A static inverter for providing a sine wave output signal comprising: pulse-generating means for supplying at a plurality of output terminals a series of predetermined sequential output pulses; switching means receiving said output pulses for providing sequentially a first DC power supply at respective ones of a plurality of output terminals thereof; and sine wave-generating means having first and second transformers with input terminals having multiple taps spaced on each transformer primary winding sequentially receiving said first DC power supply and two spaced taps on each transformer secondary winding, one secondary winding spaced tap of said first transformer operatively connected to one secondary winding spaced tap of said second transformer with a filter means for blocking a predetermined frequency and passing higher harmonics of the predetermined frequency connected therebetween, the other secondary winding spaced tap of said first transformer connected to the other secondary winding spaced tap of second transformer, the interconnection of said secondary windings spaced taps being so that signals generated by said first and second transformers are 180* out of phase with each other for providing a sine wave output signal.