LOAD DRIVE SYSTEM, ELECTRIC MOTOR DRIVE SYSTEM AND VEHICLE CONTROL SYSTEM

摘要

Provided is a load drive system which is small in size and has a high noise suppression effect irrespective of the control duty even when a load drive system that includes three 3-phase inverters is constructed. The load drive system comprises: 3-phase inverters (301 to 303) which are individually connected to respective loads (211 to 213); a first control section (401) which generates a sawtooth wave voltage and operates the 3-phase inverter (301) in accordance with the sawtooth wave voltage; a second control section (402) which generates an inverse sawtooth wave voltage and operates the 3-phase inverter (302)in accordance with the inverse sawtooth wave voltage; and a third control section (403) which generates a triangular wave that has the gradient of the sawtooth wave voltage and the gradient of the inverse sawtooth wave voltage, and that is in phase or offset in phase by a half cycle with respect to the sawtooth wave voltage and the inverse sawtooth wave voltage, and the third control section (403) operates the third inverter (303) in accordance with the triangular wave.