Title :
Small-signal modeling for design of robust variable-frequency flyback battery chargers for portable device applications
Author :
Lempinen, J. ; Suntio, T.
Author_Institution :
Electron. Lab., Oulu Univ., Finland
Abstract :
A novel methodology to derive small-signal models for a peak-current controlled variable-frequency flyback converter operating in boundary mode is presented. The loop gain of a universal input 5-W battery charger for mobile phones is analyzed and compared to the predictions. The results obtained show a good correlation between predictions and measurements validating the modeling. The implications (i.e. RHP and ESR zeros as well as opto-coupler in the feedback loop) for controller design is discussed
Keywords :
AC-DC power convertors; battery chargers; control system analysis; control system synthesis; electric current control; feedback; poles and zeros; robust control; 5 W; AC/DC power conversion; ESR zeros; RHP zeros; boundary mode operation; controller design; device applications; feedback loop opto-coupler; loop gain; mobile phones; robust variable-frequency flyback battery chargers; small-signal modelling; Bandwidth; Batteries; Inductors; Magnetic variables control; Manufacturing; Paramagnetic resonance; Robustness; Switches; Switching frequency; Voltage;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2001. APEC 2001. Sixteenth Annual IEEE
Conference_Location :
Anaheim, CA
Print_ISBN :
0-7803-6618-2
DOI :
10.1109/APEC.2001.911700
