Abstract:
An ideal AC power supply must be supply a pure sinusoidal output voltage waveform and
the size should be small. In the present, power supplies which are available have several
disadvantages such as large size, high weight and square wave output voltage waveform. This
waveform consists of other harmonics, apart from the fundamental frequency. Therefore several
AC loads such as; electric motor, fluorescence lamp or other electrical devices may be
malfunction or damage.
This research aims to build an AC power supply which a pure sinusoidal output voltage
waveform with low total harmonic distortion, small size, light weight and low cost. It is
convenience for using with electrical load in case of no electricity in the area. An AC power pack
has been analyzed, designed and built using full-bridge series-loaded resonant converter operated
in discontinuous current mode with 100 kHz maximum switching frequency. A voltage to
frequency converter is used to control the switching frequency. The prototype system offers pure
sinusoidal output voltage 230 V, 50 Hz, maximum output power 200 W and maximum total
harmonic distortion 4.86 %