標題: Pseudo-Constant Switching Frequency in On-Time Controlled Buck Converter with Predicting Correction Techniques
作者: Chen, Wei-Chung
Chen, Hsin-Chieh
Chien, Meng-Wei
Chou, Ying-Wei
Chen, Ke-Horng
Lin, Ying-Hsi
Tsai, Tsung-Yen
Lin, Shian-Ru
Lee, Chao-Cheng
交大名義發表
National Chiao Tung University
關鍵字: Adaptive on-time control;dc-dc converter;direct current resistance;on resistance;on time control;predicting correction technique (PCT);switching frequency
公開日期: 1-May-2016
摘要: The predicting correction technique (PCT) is proposed to achieve an adaptive on-time control for ripple-based buck converters. The switching frequency f(SW) variation is suppressed when the PCT technique considers complete parasitic resistances of the components and devices. Even without extra clock-controlled circuits and current sensing circuits, the buck converter operates with a nearly constant f(SW) over a wide load range. Parasitic resistances almost cause no influence and restriction on f(SW). Only input voltage is used to predict the adaptive on-time. Measurement results show only 0.32% in Delta f(SW) / f(SW) and 5.7 kHz/A in Delta f(SW) / Delta I-LOAD in case of 1.4 A load current change and f(SW) is 2.5 MHz. Consequently, a pseudo-constant f(SW) with well-defined noise spectrum strongly benefits the solution of electromagnetic interference (EMI) for system-on-a-chip (SoC) applications.
URI: http://dx.doi.org/10.1109/TPEL.2015.2457571
http://hdl.handle.net/11536/129477
ISSN: 0885-8993
DOI: 10.1109/TPEL.2015.2457571
期刊: IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume: 31
起始頁: 3650
結束頁: 3662
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