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http://dx.doi.org/10.7471/ikeee.2018.22.3.613

A Study on 60W Class Ultra-small Adapter with Active Snubber Type Flyback Converter  

Ahn, Tae-Young (Department of Applied Electronic Engineering, Cheongju University)
Publication Information
Journal of IKEEE / v.22, no.3, 2018 , pp. 613-618 More about this Journal
Abstract
In this paper, an active snubber type flyback converter was applied to a 60W class adapter and its test results are reported by producing a prototype. Especially, the prototype of the adapter was designed for both input voltage of 110V and 220V. The output voltage was designed for 60W with 19V class which is the most commonly used in laptops. The prototype was designed to a volume of about $50cm^3$ and a power density of about $1.22W/cm^3$ to minimize the size and verify portability. The maximum efficiency of the prototype was 90.88% at its maximum load of 60W against input voltage change and 91.04% was observed at 60W under input voltage of 220V. Furthermore, the stability of the output voltage against load power was observed to be within about 0.07%.
Keywords
Active snubber; Quasi resonant switching; Valley switching; Flyback converter; AC adaptor;
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