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US 6,643,156 B2Granted
Transformerless two-phase inverter
AssigneeGlobal Thermoelectric Inc.
InventorLuis Zubieta
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AssigneeGlobal Thermoelectric Inc.
InventorLuis Zubieta
Estimating the term…
A DC to two-phase AC inverter that includes three one-leg switch mode inverters circuits or a three-phase bridge circuit and a controller/driver circuit. The controller/driver circuit includes a triangular waveform generator and two sinusoidal reference waveform generators out of phase with each other, the sinusoidal waveforms generated at the desired AC output frequency, and the triangular waveform generated at a higher frequency. The controller/driver circuit is configured to drive one leg of the bridge circuit with a 50% duty cycle at the triangular waveform frequency and the other two legs at the triangular waveform frequency with pulse width modulated signals, the pulse widths of each signal varying with a discrete one of the sinusoidal waveforms. Each phase of two-phase AC is provided by the inverter between the leg driven at the 50% duty cycle and a discrete one of the other legs.
An apparatus for converting DC power to two-phase AC power, comprising:
A method of converting DC power to two-phase AC power utilizing a three-phase bridge circuit having a first leg, a second leg, and a third leg wherein the first leg produces VPhase1, the third leg produces VPhase2 and the second leg produces Vneutral and wherein VPhase1 is out of phase with VPhase2, comprising the steps of:
Dependencies are inferred from the claim text.