Current Pump of Fast Li-ion Battery Charger

• Main Authors: Ming-Huei Hong, 洪明輝
• Other Authors: Roger Yubtzuan Chen
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/15055855543641606564

碩士 === 國立雲林科技大學 === 電子與資訊工程研究所 === 97 === With the advance of information technology, battery is playing an indispensable role for mobile devices. A good rechargeable battery needs a good battery charger to extend the battery’s life. We employ a phase-locked loop as the basic framework to implement a battery charger. Initially, the PLL is in a acquisition phase, and the PFD will more charge signals. After, the charger will reduce the charge pulse wave and the width gradually. The charge signals depend on the product of pulse width and current size. A battery''s energy density is also affected by these two factors. Our charger uses five segment of charging currents. The charger first uses a larger current to achieve the rapid charge rate, and later a smaller current to achieve the battery’s energy density.