Integrated Circuit Design of Primary-Side Regulator

• Main Authors: Zhen-Yao Kao, 高振堯
• Other Authors: Chorng-Sii Hwang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/d6n88e

碩士 === 國立雲林科技大學 === 電機工程系 === 102 === In recent decades, the portable electronic products, such as the smartphone, the laptop… etc., have been rapidly became popular. Rechargeable batteries are the main power sources of those products. Thus, it makes the power management integrated circuit (PMIC) become an important part of those application. How to transfer the energy to the battery effectively and safely turns to be one of the hottest topics today. In this thesis, the Primary Side Regulator (PSR) which can be applied in the Flyback Converter is proposed and designed in circuit integration. The PSR senses the output voltage information from the secondary side according to the feedback path of the Transformer’s Auxiliary Side to be a feedback path. In order to Without the feedback network of conventional Flyback Converter, it can achieve the merits of the low cost and the small area. This thesis adopts the Knee Voltage Detection (KVD) technique to acquire the accurate output voltage information. The PSR has two charging mode : the first one is constant current (CC) mode, the other is constant voltage (CV) mode. In CC mode, the PSR utilizes the Current Calculator circuit to obtain the average output current. In CV Mode, the PSR uses the KVD to catch the output voltage information. The PSR will enter Green mode after the knee voltage is achieve to increase the power efficiency inherently.