Performance comparison of DC-DC controllers with FPGA

Abstract:
Electrification of vehicles and smart grids requires efficient power converters. This paper compares the dynamic performance and efficiency of different control schemes applied to a bi-directional buck-boost converter with a specified loading cycle. FPGA-based high-frequency hysteresis (hysteretic) control is proposed to achieve higher efficiency through reduced switching losses. PWM and hysteresis control are implemented on an FPGA using model-based design. It is shown how optimization of numeric precision with automatic code generation can be used to reduce resources used on the FPGA, and how the design can be extended to multiple inductor phases.