Patent ID: 8537580

Claim:
A controller of a power converter that is applied to a power converter comprising an inverter including a plurality of semiconductor switching elements, and controls a switching element of the inverter by using pulse width modulation, the controller comprising: a current command generator that generates a current command; a current control unit that generates a voltage command to pass a desired current to a load connected to the inverter based on the current command; a carrier-frequency setting unit that sets a carrier frequency command used to perform pulse width modulation to the inverter corresponding to the current command and a change rate of the current command; and a switching pattern calculator that calculates a switching pattern command by performing the pulse width modulation based on the voltage command and the carrier frequency command, wherein the carrier-frequency setting unit defines a carrier frequency corresponding to the current command and the change rate of the current command, and outputs information on the carrier frequency to the switching pattern calculator, and the carrier-frequency setting unit includes a first two-dimensional map having mapped thereon information of a carrier frequency corresponding to the current command expressed in one of orthogonal axes and the change rate of the current command expressed in the other of the orthogonal axes, and outputs information of a carrier frequency on the first two-dimensional map corresponding to an input current command and a change rate of the input current command to the switching pattern calculator.