Generally, conventional type active filter utilizes voltage source inverter, which requires high frequency switching devices in order to compensate high order harmonics. But due to the switching frequency characteristics of the devices, it is difficult to reduce the electro-magnetic noise. So we proposed a combined-type active filter using linear power amplifier and low-switching frequency converter. Presently, there is a problem which spike-like current occur power supply current at the time of load changes. In this paper, we propose compensation method of current at the time of load changes.
