Abstract
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. To reduce the switching frequency, current source inverter is one of the good solution. But, it is not in practical use. So we proposed the new type active filter using linear power amplifier without switching operation. But the efficiency of this type active filter is very low. So we study on the reduction of the capacity of linear power amplifier by using combined type active filter in this paper.
