#LINK UNFOLDER SERIES#
The power converter of claim 4, wherein the three-input converter comprises a plurality of three-input converters, wherein each three-input converter comprises two positive input connections connected to switches to connect to the first primary transformer winding of the three-input converter and two negative input connections connected to switches to connect to the second primary transformer winding and wherein the positive input connections of the plurality of three-input converters are connected in series between the positive terminal and the neutral terminal and the negative input connections of the plurality of three-input converters are connected in series between the negative terminal and the neutral terminal and wherein output terminals of the plurality of three-input converters are connected in parallel.Ħ. The power converter of claim 1, wherein the three-input converter comprises a first primary transformer winding and a second primary transformer winding with at least one secondary transformer winding connected to a rectification section connected to the output terminals, wherein the three-input converter comprises switches to connect each of the positive and neutral terminals to the first primary transformer winding and switches to connect each of the negative and neutral terminals to the second primary transformer winding.ĥ. The power converter of claim 1, wherein a switching frequency of switches in the three-input converter is at least 100 times a switching frequency of the unfolder.Ĥ. The power converter of claim 1, wherein a voltage across the positive terminal and the negative terminal comprises a DC voltage with an AC ripple and wherein a voltage range of a voltage across the positive terminal to the neutral terminal overlaps a voltage range of a voltage across the negative terminal to the neutral terminal.ģ. A power converter comprising: an unfolder comprising an input connection comprising three input terminals that connect to a three-phase alternating current (“AC”) power source with each of the three phases spaced 120 degrees apart and comprising an output connection with a positive terminal, a negative terminal and a neutral terminal, wherein the unfolder unfolds bipolar AC voltages into two unipolar piece-wise sinusoidal direct current (“DC”) voltages offset from each other by a half of a period, each of the unipolar piece-wise sinusoidal voltages comprising a semi-triangular waveform comprising rising and falling portions of voltages of the three-phase AC power source and a three-input converter that produces a DC voltage output across output terminals, the three-input converter comprising a positive input connection connected to the positive terminal, a negative input connection connected to the negative terminal and a neutral input connection connected to the neutral terminal, wherein the three-input converter comprises switches that selectively connect a voltage to the positive, negative and neutral input connections across a primary transformer winding of a transformer, wherein a secondary transformer winding of the transformer is connected to the output terminals through a rectification section.Ģ. A secondary transformer winding is connected to the output terminals through a rectification section.ġ. The three-input converter includes switches that selectively connect a voltage to the positive, negative and neutral input connections across a primary transformer winding of a transformer. The three-input converter includes a positive input connection connected to the positive terminal, a negative input connection connected to the negative terminal and a neutral input connection connected to the neutral terminal. The power converter includes a three-input converter that produces a DC voltage output across output terminals.
The unfolder unfolds the bipolar AC voltages into two unipolar piece-wise sinusoidal DC voltages offset from each other by a half of a period. A power converter includes an unfolder with an input connection with three terminals that connect to a three-phase AC power source and that has an output connection with a positive terminal, a negative terminal and a neutral terminal.
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