T11.9 - A 100kHz Digitally Controlled 10kW, 2-Channel Solar MPPT Converter using 3-Level Topology with >75W/in³ Power Density and >98.5% Peak Efficiency
This paper illustrates a 2 channel 100kHz, digitally controlled 10kW MPPT controller/buck converter implemented with SiC 650V MOSFETs but in a three-level flying capacitor configuration. It targets an input voltage of 425-850V with an output of 400V nominal. There are two independent channels with active current sharing on the common output 400V DC bus for feeding the battery bank or an inverter. The peak power conversion efficiency of the system is 98.5% and power density of >75w/cubic inch. This targets energy storage applications for renewables especially solar PV.
