Patent ID: 7859867

Claim:
A method for converting a DC (direct current) input voltage from a DC source ( 9 ) into an AC (alternating current) output voltage having an AC output waveform, an AC output frequency and an AC output cycle, comprising converting the DC input voltage to a DC output voltage with a specific DC output waveform, and combining with opposite polarities similar, but time shifted, DC output voltage waveforms, such as to provide the AC output voltage with respect to a reference voltage, characterized in that, the DC input voltage is converted into three DC output voltages (DC R , DC S , DC T ), one for each phase (R, S, T), having identical, but time shifted waveforms, each DC output voltage is supplied to a corresponding inductance ( 24 ) to provide the AC output voltage, and the waveforms being such, that when subtracting any two of said DC output voltages from each other a sinusoidal waveform with the AC output frequency is obtained.