By Topic

An Isolated Output-Feedback Scheme With Minimized Standby Power for SMPS

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Chia-Jung Chang ; Grad. Inst. of Electron. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; Chern-Lin Chen

A feedback network for isolated switch-mode power supplies that automatically reduces the currents flowing through the optocoupler to nearly zero under the no-load condition is presented. This feedback network uses a proposed reverse-type shunt regulator to generate an error signal for optical coupling, and a modified PWM controller is adopted to receive the feedback signal. In comparison to the conventional topology, this proposed one exhibits much lower standby power loss. Besides, light-load efficiency can be improved as well. For implementing the proposed scheme, the PWM controller and the reverse-type shunt regulator are designed and fabricated in VIS 0.5- μm 5-V/40-V high-voltage CMOS technology. Experiments reveal that a 12-V/18-W flyback converter prototype which adopts the proposed feedback technique will save a power of at least 27 mW under the no-load condition and improve the system efficiency by 2.2% under the 10%-load (1.8-W output) condition.

Published in:

Power Electronics, IEEE Transactions on  (Volume:28 ,  Issue: 11 )