Comprehensive analysis of Z source DC/DC converters for DC power supply systems

The performance of Z source DC/DC converter topologies such as, traditional and Quasi Z source based DC/DC converter (both single and three phase) are analysed, and adopted at the front end of a power conditioning unit for DC power supply system. Various switching schemes like, simple boost PWM, carrier based PWM and space vector PWM control techniques are adopted to control the inverter switches. A new Quasi Z-source network based DC/DC converter topology employing Zigzag transformer is proposed. Transformers either, linear and/or zigzag are implemented individually, for step up as well as isolation functions. Voltage Doubler Rectifier (VDR) circuit is adopted to convert the high ac voltage from the transformer to dc voltage. Simulations are carried out in MATLAB/SIMULINK environment and the results are found to be promising for all the above switching schemes.