| 摘要 |
PROBLEM TO BE SOLVED: To avoid rapid changes in the output of a power unit, even when changing the input voltage to the power unit. SOLUTION: A zero point detection circuit 21 detects the timing input AC voltage periodically reads zero. A frequency detector 22 detects the frequency of an AC power source, based on the output of the zero-point detection circuit 21. An extraction part 23 extracts a reference data, corresponding to the detected frequency from a reference data table 24. A comparison part 27 compares an output parameter of a power unit with its target value, and based on this result, the target value is updated. A coefficient calculater 28 calculates a correction coefficient, based on the target value. A correction part 25, by using the correction coefficient to correct the reference data, generates a current command value data. A pulse converter circuit 30 generates a switch control signal, corresponding to the difference component between the current command value data and an input current.
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