Power conversion apparatus

A power conversion apparatus comprising:

• a power converter comprising:
• a first switching element coupled to a positive pole of a DC power source and to one terminal of a load;
• a second switching element coupled to a negative pole of the DC power source and to another terminal of the load;
• a third switching element coupled to the positive pole of the DC power source and to the other terminal of the load;
• and
• a fourth switching element coupled to the negative pole of the DC power source and to the one terminal of the load;
• and
• a PWM controller configured to subject the power converter to PWM control so as to repeat an on-period during which a voltage is output from the DC power source to the load and an off-period during which no voltage is output from the DC power source to the load the PWM controller being configured to alternately control the first switching element and the second switching element based on a signal that is set at a high level or a low level any time during a carrier wave period, the PWM controller being configured to control one switching element of the first switching element and the second switching element based on a comparison between a command value and a carrier wave signal during a period of the carrier wave signal and to control the other switching element of the first switching element and the second switching element to be in an off state or in an on state at any time during the carrier wave period, the PWM controller being configured to switch the one switching element and the other switching element during every period of the carrier wave signal, the PWM controller comprising:
• a signal comparison section configured to output a first PWM original signal that is based on a comparison between the command value and the carrier wave signal, and configured to output a second PWM original signal that is set at the high level or the low level;
• a first PWM signal generation section configured to alternately select the first PWM original signal and the second PWM original signal in every period of the carrier wave signal so as to generate a first PWM signal;
• and
• a second PWM signal generation section configured to, in every period of the carrier wave signal, alternately select the first PWM original signal and the second PWM original signal in an order opposite a selection order associated with generation of the first PWM signal, so as to generate a second PWM signal, and
• the PWM controller configured to control the first switching element and the second switching element based on the first PWM signal and the second PWM signal.