ABSTRACT
Classic DC/DC converters consist of inductors and capacitors. They are large because of the mixture of inductors and capacitors. On engineering design experience, a circuit constructed by only inductor or capacitor may be small in size. In order to reduce the converter size and enlarge the power density, a third generation of DC/DC converters have been developed, and they are called switched component converters. Particularly, they are switched-capacitor (SC) DC/DC converters and switched-inductor (SI) DC/DC converters. The switched capacitor DC/DC converter is a new prototype of DC/DC conversion technology. Since a switched capacitor can be integrated into a power IC chip, these converters are small and have a high power density. However, most of the published papers avoid discussing the efficiency because most switched capacitor converters possess low power transfer efficiency. This section introduces a switched capacitor two-quadrant DC/ DC converter implementing voltage lift and current amplification techniques with high efficiency, high power density, and low electromagnetic interference (EMI). Experimental results verified the advantages of this converter. Four-quadrant operation is required by industrial applications. SC converters can perform four-quadrant operations as well.
