Design and control of DC-DC switched capacitor converters

This chapter discusses the design and control of a non-isolated DC-DC converter topology for FCVs. Due to the switched-capacitor and switched-inductor design, the converter features a high-gain and wide input voltage range. To be more specific, the voltage gain can reach 2(1 - d)/(1 - 2d) and duty cycle d < 0.5 while achieving high gain. The voltage stresses across components are less than half of the output voltage, which is beneficial to reducing the size and cost of the converter. In addition, the circuit topology is a common ground structure, which can avoid EMI and safety problems. In the controller design part, the PID, robust PID and ADRC are applied to regulate the DC-DC converter, respectively. Simulation results have demonstrated the effectiveness of the design. We conclude that the proposed converter is suitable for FCVs.