Development of multistage CUK converter for PV voltage regulation
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Date
2007
Authors
Salah, Wael A. Y.
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Abstract
This thesis presents the design of a transformerless SMPS for low power
applications. The converter circuit is based on CUK topology which is basically
a combination of buck and boost converter topologies. The proposed converter
topology is based on dividing the input voltage into storage devices as charging
state and delivering the stored energy to the load in the discharging state. This
process is operates at high speed to ensure continuous conduction of load
current. The developed converter converts input DC voltage throughout
multistage voltage chopping. The transfer of energy through the capacitive
elements ensures that the load current is almost ripple free. Fast switching and
low On-resistance power MOSFETs were used to step down the input voltage.
The power switches operated at high frequency, and the PWM control IC was
used to provide the operating signal for the switch.
The simulation results show, that the converter had the capability to supply
the load of power up to 100W with an efficiency of 90% under ideal parameters
using rated load supplied from PV cell. The results show that the converter
could operate properly at high switching frequency up to 500KHz. For the
purpose of minimization of the stress on MOSFET switches, the frequency used
for implementation of the converter was 200KHz. The circuit components were
selected to reduce the switching and conduction losses. Practical
implementation of the converter shows that the converter operated at an
efficiency of 80% at 70W load, and suitable for TEC application.
Description
Master
Keywords
Science physic , CUK converter , PV voltage