Title :
Adaptive frequency control strategy for piezoelectric transformer in AC/DC adapter applications using phase detector
Author :
Choi, Sungjin ; Ryu, Myounghwan ; Lee, Sangmin ; Cho, Bo H.
Author_Institution :
Sch. of Electr. Eng. & Comput. Sci., Seoul Nat. Univ.
Abstract :
An adaptive frequency control method for AC/DC adapters using a piezoelectric transformer (PT) is proposed. It combined the conventional frequency method and frequency tracking for the PT such that the main frequency control loop to regulate the output voltage is compensated by the phase loop in order to adaptively change the operating frequency range. This method provides PT gain peak tracking to tackle the resonant frequency drift problems common in the PT according to the temperature changes and sample variations, and consequently makes more efficient and stable driving of the PT possible, thus improving the overall productivity. The validity of the proposed algorithm is verified by a constructed 40W AC/DC adapter hardware using a PT
Keywords :
AC-DC power convertors; adaptive control; frequency control; phase detectors; piezoelectric devices; potential transformers; voltage control; 40 W; AC-DC adapter; adaptive frequency control; frequency control loop; phase detector; piezoelectric transformer; resonant frequency drift problems; Adaptive control; Automatic frequency control; Frequency control; Hardware; Phase detection; Phase frequency detector; Productivity; Resonant frequency; Temperature; Tracking loops;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2006. APEC '06. Twenty-First Annual IEEE
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-9547-6
DOI :
10.1109/APEC.2006.1620706
