2D Converter Combining KY and Buck Converter

As generally recognized,many applications require voltage bucking/boosting converters,such as portable devices,so a buck-boost converter with a positive voltage is presented.It combines KY converter and traditional synchronously rectified(SR)buck converter.So the problem in voltage bucking of the KY converter can be solved.It has nonpulsating output current,as it operates in continuous conduction mode and it decreases the current stress on the output capacitor and reduces the output voltage ripple.It has no right-half plane zero which means same 20dB/decade gain magnitude as a conventional(left half plane) but with 90¬ phase lag instead of lead and use the same power switches,which causes the circuit to be compact and the cost will be less.During magnetization period,the input voltage of the KY converter comes from the input voltage source and during demagnetization period,the input voltage of the KY converter comes from the output voltage of the SR buck converter