Method and inverter for converting a DC voltage into a 3-phase AC output
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United States of America Patent
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Dec 28, 2010
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app pub date -
Jan 23, 2006
filing date -
Jan 28, 2005
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Abstract
A method and inverter (2, 27) for converting a DC input voltage supplied by a DC source (9), which is in particular a solar cell array, into a 3-phase AC output. For each phase (R, S, T) the DC input voltage is converted to a DC output voltage (DCR, DCS, DCT) with a specific waveform. The waveforms of the three DC output voltages are identical, shifted in time by 120.degree. to each other and they are such that by subtracting any two of them a sinusoidal waveform is obtained. The waveform of each DC output voltage may comprise a first portion of 1/3 or 120.degree. of the AC output cycle with an amplitude of zero and a subsequent second portion of 2/3 or 240.degree. of the AC output cycle during which the DC output voltage has a non-zero amplitude.
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