Patent ID: 8054031

Claim:
A converter device, comprising: a converter circuit that includes a reactor connected to a primary side power supply, and a step-up feeding device that has a step-up switching element connected to the reactor and that boosts electric power of the primary side power supply by on/off switching the step-up switching element and outputting a stepped-up electric power as a secondary voltage; a converter control device that pulse width modulation(PWM)-controls on/off switching of the step-up switching element so that the secondary voltage becomes equal to a secondary target voltage; and a temperature detecting device that detects a temperature of the reactor, wherein the converter control device limits PWM-controlled on/off switching of the step-up switching element for step-up operation when the temperature of the reactor increases to a first predetermined value or higher, and wherein the converter control device starts an annealing process for sequentially reducing the secondary target voltage in a predetermined pattern when the temperature of the reactor increases to the first predetermined value or higher, and stops the on/off switching when the secondary target voltage reduces to a voltage of the primary side power supply or a voltage close to the voltage of the primary side power supply.