A digital adaptive slope control (DASC) technique is presented to improve the dynamic
response and efficiency of a current programmed mode (CPM) buck converter employing
a low-cost auxiliary phase. Compared to the existing nonlinear control techniques, the
advantages of the proposed control scheme include superior voltage droop and settling
time, and on-line calibration to compensate for tolerance in the inductance. The proposed
technique is experimentally verified on a 500 kHz, 10 V to 2.5 V CPM buck converter
prototype. Charge balancing and optimal transient response are achieved for a range of
positive and negative load steps. In addition, compared to a representative single phase
converter, the proposed system not only has better dynamic response but also achieves
2 % heavy-load and 10 % light-load steady-state efficiency improvement. The impact of
the auxiliary phase operation on the converter’s dynamic efficiency is also evaluated at
different load step amplitudes and frequencies.
| Identifer | oai:union.ndltd.org:TORONTO/oai:tspace.library.utoronto.ca:1807/31631 |
| Date | 04 January 2012 |
| Creators | Wen, Yue |
| Contributors | Trescases, Olivier |
| Source Sets | University of Toronto |
| Language | en_ca |
| Detected Language | English |
| Type | Thesis |
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