A simple circuit to remove X-cap bleeder resistor for reducing standby power consumption

IEICE Electronics Express

Chang-Jung Lee²  Yu-Liang Lin²  Chung-Ming Leng²  Cheng-Chien Kuo²  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: x-cap;    bleeder resistor;    standby power;    depletion-type NMOS;   

DOI  :  10.1587/elex.13.20160174

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(10)Cited-By(2)A simple circuit is introduced in this paper for eliminating power dissipation of bleeder resistor when the power converter is plugged to the power outlet. The depletion-type NMOS device can be naturally turned-on to establish discharge path of X capacitor without driving voltage for safety consideration. And the depletion-type NMOS device is virtually turned off to disconnect bleeder resistor for improving the efficiency of power converter while AC power is on. As a result, the waste power can be removed in normal operation, light load, especially in standby load conditions for comply the newest energy star specification, EuP lot 6 and 5 star standards of mobile charger standby power regulations. Experimental results demonstrate that the proposed scheme can implement ultra low standby power of converter with a simple and low cost solution.

【 授权许可】

Unknown