| 摘要 |
PROBLEM TO BE SOLVED: To provide an inverter controller capable of suppressing noises due to switching of the inverter to be hardly recognized.SOLUTION: The inverter controller repeats carrier frequency alteration from an initial value of the carrier frequency (for example, frequency f1-f3) for a period of masking (masking area) to gradually increase the carrier frequency fc. The masking period is set to a random period (for example, time T1-T3 etc.). The shorter masking period, to which the carrier frequency initial value is set, the higher value is set. As a result, noises due to switching of the inverter are hardly recognized. |
