In
a photovoltaic (PV)- or fuel-cell-based grid connected power system, a high step-up dc–dc converter is
required to boost the low voltage of a PV or fuel cell to a relatively high bus
voltage for the downstream dc–ac grid-connected inverter. To integrate the
advantages of the high voltage gain of a switched-capacitor (SC) converter and
excellent output regulation of a switching-mode dc–dc converter, a method of
combining the two types of converters is proposed in this article. The basic idea
is that when the switch is turned on, the inductor is charged, and the
capacitors are connected in series to supply the load, and when the switch is
turned off, the inductor releases energy to charge multiple capacitors in
parallel, whose voltages are controlled by a pulse width modulation technique.
FOR MORE
DETAILS: HIGH STEP UP DC–DC CONVERTERS ADOPTING SWITCHED-CAPACITOR CELL
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