A Multi-Output Step-Up/Step-Down Converter Designed by Switched Capacitor Techniques
In this paper, a multi-output step-up/step-down DC-DC converter is designed by switched capacitor (SC) techniques. Unlike conventional multi-output SC converter such as a serial fix type converter, the proposed converter can offer stepped-up and stepped-down voltages without changing circuit topology. This paper also presents a novel analysis method to estimate properties of the multi-output converter. By assuming a five-terminal equivalent circuit, the proposed analysis method can derive the power efficiency and output voltages of multi-output converters without complex matrix calculations. The results of this study are as follows: (1) simulation program with integrated circuit emphasis (SPICE) simulations show that the proposed multi-output converter can improve power efficiency about 3% from the conventional serial fix type converter when the output load is 100Ω; and (2) the theoretical results are in good agreement with SPICE simulated results. The proposed analysis method is effective to estimate the power efficiency and output voltages of the multi-output SC converters.
Keywords- DC-DC Converters, Single-Input Multi-Output Converters, Step-Up/Step-Down Converters, Switched Capacitor Circuits.