An innovative interleaved high step-up DC-DC converter with improved
capacitor-diode units
Abstract
Due to defects of low-voltage and high-current output in new
energy power generation system, it is necessary to raise the output
voltage and realize further power conversion in the subsequent stage. In
this paper, an innovative interleaved high step-up DC-DC converter is
proposed. Considering the problems of non-common ground and limited gain
in the previously proposed active network DC-DC boost converters, the
active network structure is replaced by an interleaved parallel
structure, in which charge pump units are employed, and a
switched-capacitor unit is added to further improve the voltage gain.
Finally, the experimental results of the 150W prototype show that the
converter has higher gain, lower voltage stress in switch devices and
higher efficiency. When the input voltage and output current are 16V and
1.25A respectively, the efficiency of the entire system can reach about
94.2%.
