Construction and Test of a Delta Modulated Buck Type 3 Phase Converter
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McGill University
Abstract
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A Delta Modulated, Buck Type, Three Phase PWM
Converter was constructed and tested. The converter is of
the current source type and can be used in conjunction with
current source inverters.
The d.c. current is regulated by proportional
feedback control loop. By delta modulation of the voltages
across the a.c. terminaIs of the converter, the a.c. source
currents are "indirectly" controlled so that the fundamental
components remain in a predefined phase with respect to the
source voltages.
Test results have shown that the converter draws
near sinusoidal a.c. currents at unit y power factor, with
leading power factor a possibility.
Keywords
Construction, Test, Delta Modulated Buck, Type 3, Phase Converter