Switch-mode power supplies (SMPS's) not only convert energy, they also
consume it. Typical operational efficiencies are approximately 25 to 60% for linear
power supplies, and approximately 50-90% for switching power supplies. This means
that products whose end-use electronics are dc, such as televisions and DVD players,
could consume 50% less power when operating if the power supply were upgraded from
40% efficiency to 80% efficiency. Savings can occur not only from using SMPS's
instead of linear power supplies, but also from specifying highly efficient switching
power supplies. In many cases, efficiencies are still lagging to keep costs down, since
the power consumption is considered to be relatively low (40W-700W range). Over
time, however, efficiency improvement strategies will pay back based on the cost of
energy. Therefore three common flyback converter topologies have been studied
through this thesis in the Low (15W), Medium (40W), and High (150W) Power levels.
Efficiency analysis on the three power level topologies showed that the greatest
opportunity for efficiency improvement existed in the 40W (medium power) topology.
Efficiency improvement and measurement approaches are investigated and an
optimized medium-power flyback converter is proposed and implemented resulting in
an efficiency improvement from 57.8% to 83.6%. / Graduation date: 2004
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/30228 |
| Date | 12 December 2003 |
| Creators | Ruttanapaibooncharoen, Surin |
| Contributors | Jouanne, Annette von |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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