Patent ID: 9571027
Date: 2017-02-14
CPC Classifications: H02M,H02P

Claim:
1. A power conversion device control device for controlling, in time with PWM signals that are generated from duty command values and switching frequencies, a multi-phase inverter in which a plurality of half-bridge circuits each comprising a first semiconductor switching element in an upper arm and a second semiconductor switching element in a lower arm are connected in parallel, the power conversion device control device comprising: a carrier generating unit for generating and outputting, for each of different phases, a carrier in a carrier change pattern switching between a plurality of switching frequencies sequentially and repeatedly for each repetition cycle that is a reciprocal of a repetition frequency, the carrier change pattern of each of the different phases having an average switching frequency and a spectral diffusion index, and a first average switching frequency of a first carrier change pattern among the carrier change pattern of each of the different phases being different from a second average switching frequency of a second carrier change pattern among the carrier change pattern of each of the different phases; and a PWM signal generating unit for generating, for each of the different phases, the PWM signals that are used for controlling the first semiconductor switching element and the second semiconductor switching element as instructed by the duty command values, while sequentially switching from one of the plurality of switching frequencies to another of the plurality of switching frequencies, based on the carrier output by the carrier generating unit.