Efficient Non-isolated DC-DC Converter with Optimized Switching Control

Abstract

A load adaptive high efficiency dc-dc converter with optimized switching control is proposed in this paper. The converter is controlled through the switching frequency auto-tuning over a full range of load change. The load current tracking using single current sensor is implemented with real time computation of a desired switching frequency. The new algorithm is presented to adopt the loading condition while maintaining the constant output voltage. This algorithm is implemented on a low- cost microcontroller having capability to maintain dynamic performance through DPWM operation. The converter continuously maintains the higher switching frequency under varying converter parameters and operating conditions. This Adaptive frequency Optimization (AFO) proposed controller performance is presented through simulation using MATLAB / SIMULINK and results are verified on a 100W DC-DC converter.