Novel load adaptive frequency tracking control scheme for high frequency inverter without PLL scheme

A Load adaptive frequency tracking control scheme that is named conduction time balanced loop (CTBL) for the high frequency inverter is presented without PLL scheme. Using this control method for the gate circuit of the high frequency inverter that operates in resonant frequency, it is realized to have both the power regulation function and the load adaptive tracking control function by one inverter, though the conventional PLL high frequency inverter cannot do. This paper describes the principle of the proposed control scheme with high frequency inverter operation and the relation between the CTBL and the power regulation by the phase shift modulation.