Control apparatus and control method

A control apparatus for controlling an electrical unit driven by AC power, the control apparatus comprising:

• a pair of switching elements configured to convert power from a power source into AC power and supply the AC power to the electrical unit;
• a conversion unit configured to obtain a current or voltage signal supplied to the electrical unit and convert the signal from an analog format to a digital format;
• a calculation unit configured to calculate a duty command value for performing a pulse width modulation (PWM) control for the electrical unit on the basis of the signal converted by the conversion unit;
• a generating unit configured to generate a PWM signal on the basis of the duty command value calculated by the calculation unit and a carrier signal for performing the PWM control;
• a control unit configured to control the AC power supplied to the electrical unit by switching a connection state of a switching element on the basis of the PWM signal generated by the generating unit;
• a dead time compensating unit configured to provide the PWM signal with a dead time in which the pair of switching elements are in a non-conduction state simultaneously, and compensate the duty command value on the basis of the dead time;
• and
• a correction unit configured to determine whether the carrier signal increases or decreases, and to adjust a switching timing of the switching element by correcting the duty command value compensated by the dead time compensating unit on the basis of whether the carrier signal is increasing or decreasing determined by the correction unit.