020039: 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.


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.


  • 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.

IP Protection Status

US 7130205 (issued Oct 31, 2006)
Patent Information:


For Information, Contact:

Raymond Devito
Technology Manager
Michigan State University - Test
Fang Peng