Abstract
A ring-type converter is one of the efficient step-up/step-down DC-DC converters, because the ring-type converter can be implemented using semiconductor switches and capacitor. In this paper, a ring-type DC-DC converter using charge reusing techniques is proposed to improve power efficiency. Although the conventional ring-type converter consumes the electric charge in stray parasitic capacitances idly, the proposed converter reuses a part of the electric charge in stray parasitic capacitances. Therefore, the proposed converter can realize higher power efficiency than the conventional ring-type converter, because the proposed converter can reduce parasitic power losses. Concerning the proposed converter with three capacitors, simulation program with integrated circuit emphasis (SPICE) simulations and theoretical analysis were performed to clarify characteristics. The result of SPICE simulations showed that more than 8.2% of the power efficiency was improved by the proposed converter when the output load is 10kï. Furthermore, handy theoretical equations to estimate the maximum efficiency were obtained by the theoretical analysis.
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