Patent ID: 9209626
Filing Date: 2015-12-08
Classification: H02J,H02M,Y02E

Abstract:
1. An apparatus for converting DC power from a bipolar photovoltaic source to 3-phase AC power comprising a split capacitor DC bus coupled to a semiconductor switching matrix coupled to an output filter network wherein said split capacitor DC bus comprises two series-connected groups of capacitors with three terminals; (i) a DC neutral point and common coupling point (ii) a positive capacitor terminal and (iii) a negative capacitor terminal wherein the adjectives positive and negative each refer to a voltage potential with respect to said DC neutral point and wherein said semiconductor switching matrix comprises an arrangement of semiconductor switching elements, a positive DC input, a negative DC inputs and three AC outputs and wherein said output filter network comprises three inductive elements and three capacitive elements wherein a first terminal of each inductive element is coupled to a unique output of one of said three AC outputs of said semiconductor switching matrix and wherein a second terminal of each inductive element is coupled to a unique first terminal of one of said three capacitive elements and wherein a second terminal of each of said three capacitive elements is coupled to said split capacitor DC bus and wherein said semiconductor switching matrix is a three-phase, three-level neutral point clamp topology comprising a semiconductor arrangement which allows each of said three AC outputs to be switched between said positive capacitor terminal, said DC neutral point and said negative capacitor terminal.