A new Inductorless single capacitor step down DC-to-DC converter design

Abstract

Conventional switched capacitor filter circuits require a number of capacitors for their implementation with attendant complexity, efficiency and power density costs. In this work, a simple hysteresis-controlled switched capacitor circuit requiring a single capacitor for its implementation was proposed, modeled, simulated with MULTISIM® software and also prototyped. Dependent variations in switching frequency and power density reveal that the converter has a relatively constant output ripple voltage and its efficiency figure approaches that of a conventional linear step-down converter over the same output power range.With a single capacitor and switch requirements, the circuit has a reduced complexity compared to other switched-capacitor converters.

Keywords

• Buck
• converter
• inductorless
• hysteresis
• DC-to-DC
• capacitor