Patent ID: 9391538
Filing Date: 2016-07-12
CPC Classification: H02M

Claim Text:
1. A power converter, comprising: a DC port; a three-phase AC port; a central resonant circuit having a resonant period; a set of controllable “DC” switches for electrically interconnecting said DC port and said central resonant circuit; a filter electrically connected to said AC port, said filter generating a voltage during operation of said converter; a set of controllable “AC” switches for electrically interconnecting the central resonant circuit and said filter; a switch control circuit responsive to a phase order, to a secondary-to-tertiary time percentage, and to an inversion time percentage for controlling inversion and normal conduction times of said DC and AC switches; and a modulator responsive to said voltage at said DC port, to said voltage of said filter, to current command signals, and to the voltage at the AC port, for generating the phase order, the inversion time percentage and the secondary-to-tertiary time percentage; wherein said phase order designates a first phase of the three-phase AC port as primary, and designates a second phase of the three-phase AC port as secondary, and designates a third phase of the three-phase AC port as tertiary; wherein said inversion time percentage is a percentage of the resonant period of the central resonant circuit, said inversion time percentage being used to determine a time of an end of an inversion state of a set of controllable switches, and said secondary-to-tertiary time percentage is used to determine a time of occurrence of a pulse transition from the secondary phase to the tertiary phase; wherein said inversion time percentage is generated by said modulator based on said voltage at said DC port, on said voltage of said filter, on said current command signals, and on said voltage at the AC port; and wherein said inversion time percentage is further used to determine a time when a polarity of the DC switches is flipped.