30-01-2012, 03:11 PM
A novel DC-AC Single Phase Resonant Inverter using soft switching boost converter
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INTRODUCTION
Nowadays, the power electronics is required to develop smaller, lighter, less expensive and reliable system. In order to operate these systems, a switching frequency has to be increased.
But, increasing the inverter switching frequencies is dependent on the advances in device technology and makes higher switching losses. To solve this problem, the soft switching techniques have been adopted in the inverter circuit.
By the soft-switching techniques, the switching losses are ideally zero and the switching frequencies can be increased to above the audible range. In this paper, a novel DC-AC single phase resonant inverter using soft switching boost converter is proposed.
This proposed inverter consists of soft-switching boost converter and H-bridge inverter. The soft-switching boost converter in proposed inverter additionally has resonant inductor Lr, resonant capacitor Cr, bridge diode and auxiliary switch Q2.
When the resonance between resonant inductor and capacitor is generated, the converter switches are turned on and off with soft-switching. Also H-bridge inverter switches are turned on and off with ZVS when the auxiliary switch is turned off. So all of the switches are turned on and off with soft-switching.
Zero Voltage & Zero Current Switching
Technique in which the power switch in a converter turns on and off when there is a zero voltage across it is called Zero Voltage Switching
Technique in which the power switch in a converter turns on and off when there is a zero Current across it is called Zero Current Switching
