A Symmetrical Five-Switch Hybrid Boost Converter With Output Voltage Ripple Reduction and Right-Half-Plane Zero Elimination

This paper proposes a symmetrical five-switch hybrid (SFSH) boost converter, which has the same voltage convertion ratio as the conventional boost converter and eliminates the right-half-plane zero. By making the output current path always include an inductor current path and a capacitor current path, the continuity of the output current is enhanced and the ripple of output voltage is reduced. In addition, the SFSH converter solves the flying capacitor inrush current problem in extreme duty cycle, further reducing the conduction loss in capacitor path. An experimental prototype with switching frequency of 200 kHz is designed to verify the performance of the proposed converter. The measurement results demonstrate that the SFSH converter achieves a peak efficiency of 94.5% under the condition of$V_{IN}$= 4 V,$V_{OUT}$= 6 V and$I_{Load}$= 200 mA. Compared with conventional boost converter, the output voltage ripple is reduced by up to 40 mV. The recovery time is less than 120 μs under the load transient between 100 and 500 mA.