Patent ID: 7839023
Filing Date: 2010-11-23
Classification: H02M,Y02B

Abstract:
1. A circuit, comprising: first and second energy sources coupled in series, the first energy source including a first DC-DC converter that generates a first modulated DC waveform on a first energy storage device coupled to the first energy source, the second energy source including a second DC-DC converter that generates a second modulated DC waveform on a second energy storage device coupled to the second energy source, wherein the first DC-DC converter is operably coupled in series with the second DC-DC converter to form a positive rail, a negative rail, and a neutral; and a single multi-level inverter coupled to the positive rail, negative rail, and neutral, the multi-level inverter configured to unfold and sum the first and second modulated DC waveforms to produce three-phase sinusoidal output voltages.