Development of high efficiency control method for common leg converter using golden section method

This paper describes about development of high efficiency control method for the common leg converter using golden section method. The characteristics of this system are obtained as follows. (1) This system realizes high efficiency, small size, lightweight and low cost, because the adopted conversion circuit is consisted of the common leg type single phase converter/inverter. (2) The converter/inverter system achieves to high efficiency based on the current and voltage follow up control with golden section method in real time. Golden section method is calculated to optimal output voltage of the every legs for get maximum efficiency under the calculated switching and the conducting losses and the desired output voltage of converter/inverter. As a result, it is not only obtained the excellent performances such as 99% power factor, over 94% efficiency, sinusoidal source current and output line voltage but also applied to the three phase system and the active filter.