Patent ID: 7446511

Claim:
An active power conditioner, said active power conditioner connected with a load and a power source in parallel, comprising: a DC power capacitor providing a stabilized dc voltage; a power converter configured by a bridge power electronic switch set, the power converter having a DC side connected with the DC power capacitor, and an AC side; a high-frequency filter connected with the AC side of the power converter, the high-frequency filter filtering high-frequency harmonics caused by switching operation of the power converter; and a control circuit controlling the power electronic switch set of the power converter, the control circuit only detecting a voltage of the DC power capacitor and a current of the power source to generate driving signals for the power converter; wherein the driving signals generated from the control circuit actuates the power electronic switch set of the power converter to switch the voltage built by the DC power capacitor that supplies a current via the high-frequency filter, the current supplied from the active power conditioner reduces the harmonic and reactive currents of the load such that a current supplied from the power source is a sinusoidal waveform and approximates in phase with the voltage of the power source.