A Buck Converter with Voltage Controlling for ER-Fluid Absorber Applications

• Main Authors: Mei-Shiou Liu, 劉玫秀
• Other Authors: Chih-Lung Shen
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/80915937161374024365

碩士 === 國立高雄第一科技大學 === 電子工程系碩士在職專班 === 103 === This thesis researched on the vehicle shock absorbers composed of ER damper. ER fluid can be pressurized by the strength of the electric field to control the damping force, and thus can replace conventional hydraulic damper. The advantages of ER damper include fast response, easy to control, simple device, easy to use, and low energy consumption. This thesis firstly employed a high voltage generator to control the strength of the pressurized electric field, then manipulated the self-excited oscillation to drive the power transistor, converting DC to DC, and boosted voltage through high-frequency transformer and voltage doubler. The input voltage of the high voltage generator was controlled by a buck converter, whereas the input location of the buck converter was the vehicle''s battery. Consequently, as long as the duty cycle of the buck converter was changed, the output voltage of the high voltage generator would be altered as well, and further regulate the damping force of ER damper. Since the power came from the vehicle''s battery, no additional power would be needed. With such simple system architecture, the costs would be greatly reduced. This thesis made a real prototype and measured waveform assisted by the hardware to verify the feasibility of the proposed circuit architecture.