| 摘要 |
<P>PROBLEM TO BE SOLVED: To enhance the utilization factor of power supply voltage when a plurality of three-phase loads are driven by controlling each three-phase load independently even in case of three or more three-phase loads. <P>SOLUTION: A switch group is formed of three switches corresponding to respective phases of a three-phase load and each of a plurality of three-phase loads is operated by two sets of switch group selected from a plurality of sets of switch group. The number of required switches is reduced by sharing the switch group between two three-phase loads. Voltage utilization factor of an inverter is enhanced by sharing the power supply voltage depending on the command value for each inverter. The switch inverter has (n+1) sets of switch group including three switches for applying a drive voltage to each phase for n three-phase loads, and an inverter for controlling each three-phase load is constituted of two adjoining switch groups by connecting the switches of the same phase in series between the switch groups. <P>COPYRIGHT: (C)2009,JPO&INPIT |
