IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
A simple circuit to remove X-cap bleeder resistor for reducing standby power consumption
Chung-Ming LengChun-Lung ChenYu-Liang LinCheng-Chien KuoChang-Jung Lee
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2016 Volume 13 Issue 8 Pages 20160174


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.

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© 2016 by The Institute of Electronics, Information and Communication Engineers
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