Axpert MEX-1500/ MEX-3000 Service manual
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3.3 DC TO AC inverter (full-bridge)
The Inverter circuit (Figure 3.3) of Axpert MEX series is based on a full-bridge circuitry and its output is
driven by photo-couplers. The photo-couplers are capable to drive high energy and high speed power of
MOSFET and IGBT with independent high and low referenced output channels.
To construct a high frequency PWM inverter, the drivers receive switching signals from PWM generation
circuit through a pair of photo-couplers to trigger the upper IGBT and the lower IGBT alternately. The
output of IGBT's is filtered by an LC circuit to reduce the o/p voltage harmonics distortion.
Figure 3.3 Full-bridge topology
