Efficiency Optimization in Digitally Controlled Flyback DC–DC Converters Over Wide Ranges of Operating Conditions
Authors:
- 3 February 2012
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Electronics
- Vol. 27 (8) , 3734-3748
Abstract
This paper presents an approach to efficiency optimization in digitally controlled flyback dc-dc converters over wide ranges of operating conditions. Efficiency is characterized and optimized based on power loss modeling and multivariable nonlinear constrained optimization over power-stage and controller parameters. A valley switching technique is adopted to reduce MOSFET turn-on switching loss in discontinuous conduction mode. An optimization procedure is formulated to minimize power loss weighted over a range of operating points, under a cost constraint. A lookup table-based digital controller is applied to achieve on-line efficiency optimization by programming switching frequencies and operating modes based on the efficiency optimization processes. The proposed on-line efficiency optimization approach is verified by experimental results on a low cost 65 W flyback dc-dc prototype.Keywords
This publication has 27 references indexed in Scilit:
- Sensorless optimization of dead times in dc–dc converters with synchronous rectifiersIEEE Transactions on Power Electronics, 2006
- Accurate prediction of ferrite core loss with nonsinusoidal waveforms using only Steinmetz parameters2003
- Optimizing the winding strategy of the transformer in a flyback converter2002
- Utilization of the power losses map in the design of DC/DC converters2002
- Optimizing design for low voltage DC-DC converters2002
- Adaptive off-time control for variable-frequency, soft-switched flyback converter at light loadsIEEE Transactions on Power Electronics, 2002
- Fundamentals of Power Electronics2001
- Computationally efficient winding loss calculation with multiple windings, arbitrary waveforms, and two-dimensional or three-dimensional field geometryIEEE Transactions on Power Electronics, 2001
- Design considerations and performance evaluations of synchronous rectification in flyback convertersIEEE Transactions on Power Electronics, 1998
- Utilization of an active-clamp circuit to achieve soft switching in flyback convertersIEEE Transactions on Power Electronics, 1996