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Title: Fast-Transient PCCM switching converter with freewheel switching control
Authors: Ma, Dongsheng
Ki, Wing-Hung
Keywords: Switching converter
Pseudo-continuous-conduction mode (PCCM)
Freewheel switching
Voltage ripple
Transient response
Current ripple
Issue Date: 2007
Citation: IEEE transactions on circuits and systems II : express briefs, v. 54, no. 9, September 2007, p. 825-829
Abstract: This brief presents a new switching converter operating in pseudo-continuous-conduction mode (PCCM) with freewheel switching control. Compared with conventional discontinuous-conduction mode (DCM) converters, this converter demonstrates much improved current handling capability with reduced current and voltage ripples. The control-to-output transfer function exhibits a single-pole behavior, making the load transient response much faster than its CCM counterparts. Simulation and experimental results show that, with a 6-V, 6-W load and a 10-V unregulated supply, the PCCM converter has a current ripple of only 1.1 A and a ripple voltage of only 58 mV, while a DCM converter has a current ripple of 2.2 A and a ripple voltage of 220 mV. In addition, the PCCM converter takes only 25 μs to respond to a 500-mA load current change while a CCM one requires 1.4 ms.
Rights: © 2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
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