Patent ID: 7729139

Claim:
A current source inverter, feedbacking an AC output current to an independent power supply having a load, providing an electrical power to the load, and comprising: a buck converter receiving a DC input voltage and generating an inductor current having a rectified sinusoidal waveform; a DC/AC converter coupled to the buck converter, receiving the inductor current and providing the AC output current; and an energy clamp circuit coupled to the buck converter and the DC/AC converter, and comprising: a plurality of diodes coupled to the buck converter and the DC/AC converter; and a first switch coupled to one of the buck converter and the DC/AC converter for eliminating an inrush current at one of the states that the DC input voltage is not built up yet and the DC input voltage is less than a peak value of an AC output voltage of the independent power supply, while the current source inverter is electrically connected to the independent power supply.