The Feedback Pi Controller for Buck-boost Converter Combining Ky and Buck Converter

Most mobile equipments use battery as power source. The increasing use of low voltage portable devices and growing requirements of functionalities embedded into such devices. Thus an efficient power management technique is needed for longer battery life for them. Given the highly variable nature of batteries systems often require supply voltages to be both higher and lower than the battery. This is most efficiently generated by a buckboost switching converter. But here the converter efficiency is decreased since the power loss occurs in the storage devices. Here we analyze and describe step by step, process of designing, feedback control and simulation of a novel voltage-bucking/boosting converter, combining KY and synchronous buck converter for battery power applications. Unlike the traditional buck–boost converter, this converter has the positive output voltage, different from the negative output voltage of the traditional inverting buck–boost converter. Since such a converter operates in continuous conduction mode. Also it possesses the non-pulsating output current, thereby not only decreasing the current stress on the output capacitor but also reducing the output voltage ripple. Both the KY converter and the synchronous buck converter, combined into a positive buck–boost converter, uses the same power switches. Here it makes the circuit to be compact and the corresponding cost to be down.