Transient Response Improvement of DC-DC Buck Converter by a Slope Adjustable Triangular Wave Generator

Shu WU  Yasunori KOBORI  Nobukazu TSUKIJI  Haruo KOBAYASHI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E98-B   No.2   pp.288-295
Publication Date: 2015/02/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E98.B.288
Type of Manuscript: PAPER
Category: Energy in Electronics Communications
Keyword: 
adjustable triangular wave,  DC-DC buck converter,  voltage mode control,  transient response,  line feed-forward control,  

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Summary: 
This paper describes a simple-yet-effective control method for a DC-DC buck converter with voltage mode control (VMC), with a triangular wave generator (TWG) which regulates the slope of triangular wave based on the input and output voltages of the converter. Using the proposed TWG, both the load and line transient responses are improved. Since the TWG provides a line feed-forward control for the line transient response, it increases the open-loop bandwidth, and then better dynamic performance is obtained. Additional required circuit components are only a voltage controlled linear resistor (VCR) and a voltage controlled current source (VCCS). Compared with the conventional voltage control, the proposed method significantly improves the line and load transient responses. Furthermore this triangular wave slope regulation scheme is simple compared to digital feed-forward control scheme that requires non-linear calculation. Simulation results shows the effectiveness of the proposed method.