Power conversion apparatus

摘要

A power conversion apparatus includes a power converter and a PWM controller. A first switching element is coupled to a positive pole of a DC power source and one terminal of a load. A second switching element is coupled to a negative pole of the DC power source and another terminal of the load. A third switching element is coupled to the positive pole and the other terminal. A fourth switching element is coupled to the negative pole and the one terminal. The PWM controller PWM-controls the power conversion apparatus to repeat an on-period during which the DC power source outputs a voltage to the load and an off-period during which no voltage is output. The PWM controller alternately controls the first and second switching elements based on a signal set at a high or low level any time during a carrier wave period.

主权项

1. 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; anda 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 comprising:
a signal comparison section configured to output a first PWM original signal that is based on a comparison between a command value and a 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; anda 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.