Abstract
ABSTRACT This work suggested a novel configuration of serial-parallel-switched-capacitor coupled-inductor (SPSCCI) inverter as well as its analysis, design and implementation to achieve high-gain boost DC-AC conversion and closed-loop regulation. The power part consists of two cascaded sub-circuits: a SPSCCI booster (a coupled inductor with turn ratio n, four pumping capacitors, five switches) and a half-bridge DC-link inverter (two bridge capacitors, two switches), so as to attain a wide DC-AC gain as: +0.5×[4(n + 1)+(1+ nD)/(1-D)]∼_0.5×[(4(n + 1)+(1+ nD)/(1-D)] (D: ratio cycle). When n = 4,D = 0.5, AC output can be +13~-13 times voltage of DC supply. Increasing n or D makes a higher gain, but it results in a larger weight/volume or magnetic bias/saturation of inductor. Here, the extendable switched-capacitor count can provide an extra gain to relieve these stresses. The control part consists of a phase generator and a sinusoidal pulse-width-modulation (SPWM) compensator, mainly fabricated on a full-custom chip: D35-105B-E0008, TSMC 0.35 μm 2P4M, 1500 × 1500 μm2, 5 V, 2.68 mW, 200 kHz max. Finally, the simulation results are illustrated to examine the validity of these analysis and design, and the experimental results are verified on the prototype circuit to prove the practicality .
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