Abstract
In conventional pulse width modulated full bridge inverters; all power devices are switched at high frequency and are consequently subject to significant power losses. In this paper, the bridge switches are controlled at the low frequency of the load voltage. The proposed inverter is shown to have smaller device losses and higher power transfer efficiency than commonly used control schemes, while producing a lower harmonic distortion in the ac output voltage. The proposed system is microcontroller-based trigger system which provides the pulse train to the IGBT buck converter switches and the main switches of the bridge inverter, the microcontroller is programmed to provide a sinusoidal pulse width modulated signal in a corresp onding matter to the conventional system but it works at high efficiency, precision and with low components. The p roposed dual-stage system can eliminates the commutation circuit since when the IGBT buck is off the current through the main switch thyristors reduced to zero.
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