Open AccessSwitched‐capacitor quadratic buck converter for wider conversion ratios
Author(s) -
ReyesMalanche Josue Augusto,
Vázquez Nimrod,
LeyvaRamos Jesus
Publication year - 2015
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2014.0755
Subject(s) - buck converter , capacitor , buck–boost converter , ćuk converter , duty cycle , rectification , control theory (sociology) , voltage , quadratic equation , diode , voltage multiplier , computer science , topology (electrical circuits) , inductor , electronic engineering , electrical engineering , mathematics , engineering , voltage regulation , control (management) , artificial intelligence , dropout voltage , geometry
Low voltage and high current are typical requirements for the input source of the new family of microprocessors; therefore there is the need to develop new topologies and control strategies that can meet such requirements. A narrow duty ratio has limited the application of the conventional buck converter for wider step‐down DC–DC conversion. An interesting option is to consider the quadratic buck converter; however, there is still the problem to obtain a wider step‐down conversion. In this study, a switched‐capacitor quadratic buck converter is proposed such that a wider conversion ratio is obtained for lower‐output voltages. The converter consists of a quadratic buck converter with an array of capacitors and diodes, also referred as a voltage multiplier. To illustrate the behaviour of the proposed converter, experimental results are shown for a conversion from 36 to 1.5 V and an output power of 30 W. The efficiency of the proposed converter can be effectively increased when soft‐switching and synchronous rectification are implemented.