A Right-Half-Plane (RHP) Zero Alleviating Skill in the Solid-Duty-Control (SDC) Boost Converter

• Main Authors: Wu, Dian-Rung, 吳典融
• Other Authors: Chen, Ke-Horng
• Format: Others
• Language: en_US
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/43097003373455088222

碩士 === 國立交通大學 === 電控工程研究所 === 99 === his paper proposes a solid-duty-control (SDC) technique to keep a constant duty value to reduce dip voltage during load transient period. It’ll improve the transient response of DC-DC boost converters, which suffer from low bandwidth due to the existence of right-half-plane (RHP) zero. In order to reduce the RHP effect, two controllers are proposed to enhance transient performance. To get contain duty value during load transient period, using adaptive hysteresis window (AHW) modulator control the on-time and off-time of the converter. Besides, due to variable transient enhancement (VTE) controller, the transient response is achieved. The proposed SDC technique can provide a stable and regulated output for edge-lit LED backlight systems. This converter has been implemented in a 0.25-μm CMOS process. Compared to conventional design without any fast transient technique, experimental results show the undershoot voltage and recovery time are improved about 30 % and 80 % as load current suddenly changes from 50mA to 250mA, respectively.