Patent ID: 9154052
Filing Date: 2015-10-06
Classification: H02M

Abstract:
1. A power inverter circuit comprising: first and second switching elements, sequentially connected in series between input terminals on higher and lower voltage sides, having an intermediate node connected to a first output terminal; and third and fourth switching elements, sequentially connected in series between the input terminals on the higher and lower voltage sides, having an intermediate node connected to a second output terminal; wherein the power inverter circuit alternatively turns on a set of the first and fourth switching elements and a set of the second and third switching elements so as to convert a DC power fed between the input terminals on the higher and lower voltage sides into an AC power between the first and second output terminals; wherein the set of the second and fourth switching elements is subjected to switching control at a frequency higher than that of the set of the first and third switching elements; wherein the first switching element is subjected to switching control using a pulse width modulation scheme while the fourth switching element is subjected to switching control using a pulse width modulation scheme at a frequency at least twice as high as the switching frequency of the first switching element in a half-cycle period of the AC power when the first and fourth switching elements are on; and wherein the third switching element is subjected to switching control using a pulse width modulation scheme while the second switching element is subjected to switching control using a pulse width modulation scheme at a frequency at least twice as high as the switching frequency of the third switching element in the other half-cycle period of the AC power when the second and third switching elements are on.