AC DC rectifier (CMOS rectifier) to minimise reverse leakage current

• Main Author: Chan, Jeffery Jian Yang
• Other Authors: Siek Liter
• Format: Final Year Project
• Language: English
• Published: 2016
• Subjects: DRNTU::Engineering::Electrical and electronic engineering
• Online Access: http://hdl.handle.net/10356/68343
• Institution: Nanyang Technological University

The conventional AC to DC rectifier is a bridge rectifier which requires 4 diodes, of which 2 diodes are used to rectify each time. This process will result in 2x0.7V voltage drop. The drop in voltage is significant particularly in low voltage application, with voltage of 5V. As this means that 28% of the voltage is decreased. Therefore to solve this problem, a high efficiency AC to DC rectifier is designed in this experiment. The project is implemented in standard CMOS 0.18um AMS process. The rectifier consists of a CMOS negative voltage rectifier and an unbalanced biasing wide swing cascode comparator. This comparator aims to minimise the reverse leakage current effect. The proposed rectifier obtained a peak power conversion efficiency (PCE) of 93.7% and voltage conversion efficiency (VCE) of 95.08% at resistor load 2000Ω, frequency of 125 kHz and input voltage of 5V in this experiment.