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Off-time Control Method for High Power Density AC/DC Adapter  

Kang, Shin-Ho (단국대 대학원 전자공학과)
Jang, Jun-Ho (단국대 대학원 전자공학과)
Hong, Sung-Soo (국민대 전자정보통신공학부)
Lee, Jun-Young (단국대 전자공학과)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.12, no.6, 2007 , pp. 510-516 More about this Journal
Abstract
The proposed method offers an improved control method for high power density AC/DC adapter by using more energy efficient electrical equipments. Power factor correction (PFC) topology is based on boost topology with boundary conduction mode (BCM). DC/DC topology is based on half-bridge topology with fixed 50% duty and newly introduced off-time control method, which helps to reduce size of the semiconductor and the magnetic devices. Test results with 85W AC/DC adapter (18.5V/4.6A) design show that the measured efficiency is 90% with power density of $36W/in^3$. It also shows low no load power consumption of about 0.5W.
Keywords
AC/DC adapter; high power density; off-time control;
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