Rekabentuk Penyongsang Satu Fasa 700 Watt Menggunakan Teknik Pemodulatan Lebar Denyut Sinusoidal Berasaskan Mikropengawal
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Date
2011-03
Authors
Wan Dollah, Wan Zain
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
This thesis describes the design of a single-phase inverter using sinusoidal pulse
width modulation technique for general application. Microcontroller PIC16F628A is
used as switching controller to generate sinusoidal pulse width modulation signal.
Method of design is based on lookup table and manipulating the hardware pulse
width-modulating pin on PIC to generate SPWM signal. PicBasic Pro programming
language used is capable of producing a more efficient inverter control circuit with
stable output. The PIC as controller is capable of generating SPWM switching
frequency between 5 kHz to 25 kHz with THD of 5% to 16% for voltage and current
at linear load even without low pass filter. A DC-DC full bridge converter controlled
by SG3525A integrated circuit is built to raise the voltage from 28-32 V to 400 V.
The converter is capable of operating at frequency between 20 kHz to 50 kHz. The
DC-DC converter designed produce maximum efficiency of 89% and the inverter
can produce 90 % efficiency at 700 W pure resistive load. Overall efficiency of the
inverter system is 89% with THD voltage and current of 1.6% and 1.9% respectively
at 5 kHz switching frequency with low pass filter.
Description
Keywords
Penyongsang Satu Fasa 700 Watt , Mikropengawal