Z-Source Power Converter for High-Efficiency Power Conversion



Power converters, also known as power inverters, are necessary components to all electrical/electronic products. Due to their ubiquity, power converter attributes such as efficiency, robustness, cost, and peak power are very important.


Description of Technology


The invention is an Impedance Source (Z-source) Power Converter. The converter performs both buck and boost conversion, and one of DC/DC, AC/DC, or AC/AC conversion.

This converter increases robustness and efficiency while maintaining the desirable traits of prior converters (e.g. V- and I- converters). It can be used for high power applications like electric fuel cells and automobiles.


Key Benefits

  • Increased Robustness: The topology of the Impedance Source (or Z-Source) is immune to EMI compared to standard V- and I- converters.
  • Broader Applicability: The output voltage of Impedance Source (Z-Source) converter can be lower and higher than its input; such converters are known as buck-boost converters. Standard V- and I- converters restrict output to either lower or higher, known as buck or boost converters.
  • Greater Efficiency: Impedance Source (Z-Source) converters reduce common-mode voltage leading to greater converter efficiency.




Power Conversion, Power Distribution, and Automotive


Development Status


The invention has been prototyped.


Patent Status


US 7130205 (issued Oct 31, 2006)




Fang Peng


Tech ID




Patent Information:


For Information, Contact:

Raymond Devito
Technology Manager
Michigan State University
Fang Peng