Switching control device and power conversion device

Abstract

A switching control device includes: a frequency setting unit that sets a plurality of types of carrier frequencies and a frequency change period; and a control signal generation unit that controls a switching operation performed by a switching element by transitioning the plurality of types of carrier frequencies in the frequency change period. The frequency change period is set to be longer than a time width (window function width) determined by a reciprocal of a resolution bandwidth. In addition, when the average number of times of switching in the sections of the frequency change period is denoted by fave, the average number of times of switching in the sections cut out with the time width is denoted by fw, the resolution bandwidth is denoted by RBW, and m is an integer of 2 or more, fw is set to satisfy a relationship of fave−RBW/2<fw<fave+RBW/2.

Dependencies are inferred from the claim text.