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In the particular embodiments described, an unlimited voltage static power converter includes an array of multi-level phase drivers consisting of a plurality of H-bridge power modules connected in series. The midpoint node of the series-connected power semiconductors is connected to corresponding mi

In the particular embodiments described, an unlimited voltage static power converter includes an array of multi-level phase drivers consisting of a plurality of H-bridge power modules connected in series. The midpoint node of the series-connected power semiconductors is connected to corresponding midpoint nodes in adjacent H-bridges to achieve a desired high output voltage using available power switch ratings. A three-dimensional multi-level, multi-phase, multi-circuit array of H-bridges permits the use of the static power converter for high power applications, while providing a high degree of power quality. The power semiconductor switches are operated in accordance with a two-dimensional interleaved pulse width modulation algorithm which produces a waveform with a switching frequency that can be more than an order of magnitude higher than the switching frequency of a single power switch. PWM complementary triangle carrier waves are used for individual PWM control of each H-bridge in each multi-level phase driver, resulting in a two-dimensional interleaved control algorithm. Injection of harmonic or non-harmonic content into the PWM reference waveform further reduces harmonic and non-harmonic content of the output voltage waveforms. Part-load efficiency is increased using unique load partitioning methods, five of which are described herein.

대표청구항 ▼

[ We claim:] [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 configur

[ We claim:] [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; andcontrol 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 .alpha..sub.lvl =360.degree./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 .alpha..sub.ckt =.alpha..sub.lvl /2k where k is the number of static power converter circuits.