Low Input Offset and Common Mode Voltage Amplifier Applied to LLC Synchronous Rectifier Controller
Date Issued
2010
Date
2010
Author(s)
Chen, Chien-Lin
Abstract
The requirements of the power converter efficiency are gradually increasing, therefore, the synchronous rectifier had been provided for LLC converter. The basic concept of synchronous rectifier is utilized a transistor switch to replace the traditional rectifying diode and a synchronous controller is required to control the transistor switch to work as a rectifying diode.
Nonetheless, owing to the nonideal phenomena of the manufacture process, the comparator of the synchronous controller suffers an offset voltage which affects the signal from the LLC system. Therefore, the synchronous controller can not be turned off in time and the power conversion efficiency is decreased. In this thesis, a preamplifier with low input offset voltage and low common mode voltage is provided. Due to characteristic of the low input offset voltage, signal from LLC system will not be affected and can be amplified then transferred to the comparator. The characteristic of low common mode voltage ensures the preamplifier works.
Subjects
synchronous rectifier
low input offset voltage
low common mode voltage
amplifier
Type
thesis
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