Development Of The Push Pull Self Drive Synchronous Rectification Converter
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Date
2009-03
Authors
Mamat, Mohd. Nadzri
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
This thesis presents a new DC-DC converter design for low voltage application. The
proposed design is based on isolated push pull topology switched mode power supply.
Self-driven synchronous rectification is introduced in the rectification stage in order to
create an improved way of rectifying process. N-Channel and P-Channel MOSFETs are
used to simplify the synchronous rectification control circuit. Both MOSFETs offer ultra
low On-resistance which can be used to achieve higher efficiency than the conventional
converter. This converter operates at high speed switching frequency to gain high
power-to-volume ratio. In addition, minimum deadtime is set in the design to ensure
high efficiency in input-output power transfer. Passive low pass filter is implemented to
produce ripple free output voltage in the design. The finalize topology which is push pull
with self-driven synchronous rectification is constructed using simple control circuit but
maintains good efficiency in its operation. Simulation results show that the proposed
converter reacts very well with the self-driven synchronous rectification method.
Switching frequency is set to 30 kHz to minimize the switching stress and conduction
losses. Practical implementation of the converter shows that the converter operates at a
maximum efficiency of 84.1%. Besides, the design only produces 50mVp-p ripple output
voltage and considered good for a regulated DC output.
Description
Keywords
Development Of The Push Pull Self Drive , Synchronous Rectification Converter