| 摘要 |
An active filter suppresses harmonic current components flowing through a power supply, to which a compensation object load including a harmonic component source and a capacitive load is coupled. The active filter supplies a compensation current Ic in accordance with an output of a subtracter coupled to current transformers for detecting the load current I1 and the capacitive load current If, respectively. Thus, the compensation current Ic supplied from the active filter corresponds to and compensates only for the harmonic current components generated by the harmonic component source. The capacitive load current If is excluded from control operation. Thus, the positive feedback of the system is avoided, and stable control operation can be obtained.
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