Z-Source Resonant DC-DC Converter for Wide Input Voltage

This paper designs a new type resonant DC-DC converter using Z source impedance network. It can solve the efficiency degradation of the traditional series resonant converter in a wide range of input voltage by minimizing converter's switching frequency range. In addition,the converter can be short- and open-circuited without damaging switching devices. Thus the converter is very strong to EMI and converter reliability can be greatly enhanced. A DC-DC converter using the proposed concept is built and tested. Its performances are verified with experimental results.