| Title |
Stable Standby-mode Implementation of Multi-output Power Supply using a New Load Current Estimation Technique with Linear Regulator |
| Authors |
李Jong-Hyun Lee ; 烈An-Yeol Jung ; Dong-Joon Kim ; Joung-Hu Park ; Hee-Jong Jeon |
| DOI |
10.6113/TKPE/2011.16.1.88 |
| Keywords |
Multiple-output; Switching mode power supply; Linear regulator; Standby power |
| Abstract |
In this paper, a new standby-mode control method for multiple output switching-mode power-supply is suggested, which uses the control signal of the feedback compensator of the inner loop in the linear voltage regulator located at the transformer secondary side, as the load current information. Conventional method has a problem that standby mode occurs depending only on the load condition of the main controller output, which makes the other secondary side output very inaccurate by burst mode operation. The proposed method detects all the load current information and operates in burst mode only when the all of them are light load condition. Minimum of the additional components are required for the implementation of the proposed method because the load information is obtained from the existing feedback circuit of the post-stage linear regulator. In this paper, the operating principles of the proposed standby-mode circuit are presented with an numerical analysis, and are verified by 25W hardware prototype implementation. |