New scheme to eliminate power loss of start-up resistor for low standby power consumption

IEICE Electronics Express

Tung-Chin Pan²  Yu-Liang Lin²  Chung-Ming Leng²  Chun-Lung Chen¹ 

[1] Department of Marine Engineering, National Taiwan Ocean University;Department of Electronic Engineering, National Taiwan University of Science and Technology

关键词: start-up resistor;    standby power;    depletion-type NMOS;   

DOI  :  10.1587/elex.13.20160873

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(10)In the initial start-up period of power converter, there is no voltage supply from auxiliary winding to pulse-width-modulation (PWM) IC. Therefore, a typical method is connected with a start-up resistor (Rstart) between bridge rectifier and IC controller for initial voltage supply. However, the Rstart would continue to consume energy even if the auxiliary voltage has been set up. The proposed scheme uses depletion-type NMOS to connect with Rstart. The start-up mechanism can be guaranteed without any additional voltage, and naturally cut off the Rstart to minimize power dissipation once the voltage of PWM IC is supplied from auxiliary winding. As a result, the outstanding standby power performance can be implemented and comply the power regulation of 5 star standards of mobile charger. Experimental results demonstrate the standby power consumption only 28.8 mW.

【 授权许可】

Unknown