Voltage converting device

A voltage converting device comprising:

• a voltage converting portion configured to increase or decrease an input voltage through on/off operations of a switching element and then output the voltage;
• an output voltage detecting portion configured to detect a value that indicates an output voltage of the voltage converting portion;
• a setting portion configured to set, based on a set target voltage value and a detection value obtained by the output voltage detecting portion, a duty ratio of a PWM signal that is provided to the voltage converting portion so as to bring the output voltage value of the voltage converting portion closer to the target voltage value;
• a driving portion configured to output the PWM signal having the duty ratio set by the setting portion to the voltage converting portion;
• and
• an anomaly detecting portion configured to detect an anomaly in which the duty ratio set by the setting portion does not converge to a predetermined normal range when the voltage converting portion is in a predetermined stabilized state.