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 an inductor or a capacitor may be small in size. In order to reduce the converter size and enlarge the power density (PD), 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 SC DC/DC converter is a new prototype of DC/DC conversion technology. Since an SC can be integrated into a power IC chip, these converters are small and have a high PD. However, most of the published papers avoid discussing the efciency because most SC converters possess low power transfer efciency. This section introduces an SC two-quadrant DC/DC converter implementing voltage-lift and current-amplication techniques with high efciency, high PD, and low electromagnetic interference. Experimental results veried the advantages of this converter. Four-quadrant operation is required by industrial applications. SC converters can perform four-quadrant operations as well.
