Modeling, Control and Digital Implementation of a Buck Converter Operating in Triangular Current Mode for a Wide Output Voltage Range Space application

This paper presents a simplified constant on time modeling and control of a buck converter operating in triangular current mode for space applications. The buck converter operates at a variable frequency to achieve ZVS in both transitions while minimizing the RMS current through the inductor. This control is implemented in a field-programmable gate array. Since the converter operates at a variable frequency, two different data acquisition alternatives are explored: sampling at a variable frequency (once per switching cycle) or sampling at a constant frequency (higher than the switching frequency). The proposed control is validated by simulation and experimental results with a 500 W prototype.