A Switched-Active and Passive Filter Configuration for Resonance-Free Transient Regulation

摘要

The transient-induced resonance on the output voltage of a power supply can be eliminated if the output filter of the power supply is designed to appear as a constant resistor to the load. A switched active filter is studied as a means to provide this constant resistor over those narrow frequency bands where the resistor cannot be realized by passive means. Design-oriented modeling of the hybrid filter is presented, and is supported by a high-current, high-frequency simulation example, and a low-current, low-frequency experiment.