Abstract
The low temperature performance of a 50 kHz, 48/spl plusmn/10 V/12 V, 60 W three-level pulse-width modulated (PWM) buck power converter is reported. The converter was designed with standard commercially available components for operation from room temperature down to the liquid nitrogen temperature (-196/spl deg/C). The measured efficiency was 89.12% at room temperature outside the chamber, and dropped to 87.27% at -195/spl deg/C. Even at -195/spl deg/C the converter was fully functional. The three-level converters, and in general multi-level converters, offer an attractive topology for high voltage applications.
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