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Modular static power converter connected in a multi-level, multi-phase, multi-circuit configuration

  • US 5,933,339 A
  • Filed: 03/23/1998
  • Issued: 08/03/1999
  • Est. Priority Date: 03/23/1998
  • Status: Expired due to Term
First Claim
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1. A static power converter comprising:

  • at least one isolated DC power source;

    an array of power converter modules connected in a multi-level, multi-phase, multi-circuit configuration wherein;

    (a) each phase comprises a plurality of circuits and each circuit comprises a parallel configuration of multi-level phase drivers; and

    (b) each multi-level phase driver comprises a plurality of H-bridges connected in series; and

    each H-bridge comprises two pairs of power semiconductors, each pair connected in series between positive and negative terminals of an isolated DC power source, a midpoint node of the series-connected power semiconductors being connected to corresponding midpoint nodes in adjacent H-bridges, thereby permitting a maximum output voltage to be produced which is equal to the sum of the DC voltages applied to the bridges; and

    control means for controlling the power semiconductors which interleaves gate signals applied to the H-bridges of the array of multi-level phase drivers;

    the interleaving being arranged according to an algorithm whereby normal and complementary triangle carrier waveforms of a desired switching frequency are established for each level of a multi-level phase driver, and are phase shifted with respect to each other by an angle α

    lvl =360°

    /l, where l is the number of levels of the multi-level phase driver and whereby normal and complementary triangle carrier waveforms of the desired switching frequency are established for the multi-level phase drivers of the multiple circuits such that the carrier waveform for each circuit of a level of interest is phase-shifted with respect to the corresponding circuits of the same level by the angle α

    ckt

    lvl /2k where k is the number of static power converter circuits.

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