Cyro Power and Heat Transfer
Abstract
Numerous advantages of operating electronics at cryogenic temperatures are the main motivation for the present study. The foremost problem in electronic cooling is to achieve high heat flux removal capacity within confined spaces. Therefore, our focus is to investigate the heat transfer characteristics of several cooling techniques that hold such promise. The heat generated from a 9x9-heater array was removed by liquid nitrogen pool boiling. The orientation and space limitation of the array were varied to explore their effects on the critical heat flux (CHF) value. Heat transfer with cold gaseous nitrogen and liquid nitrogen from in-line discrete heat sources were also investigated. The operating characteristics of power metal-oxide-semiconductor field-effect transistors (MOSFETs) were simulated using a semiconductor device modeling and simulation software package. Simulations were performed at room temperature and liquid nitrogen temperature. It was demonstrated both experimentally and numerically that the on-resistance of a power MOSFET decreases significantly as the device temperature decreases. Such a decrease leads to a considerable reduction in heat dissipation inside the MOSFET device. Another important advantage of operating a MOSFET device at cryogenic temperatures is that the internal thermal resistance of the device decreases as well. All these improvements significantly enhance the switching performance of power MOSFETs at high frequencies as the operating temperature decreases.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1998
- Accession Number
- ADA365136
Entities
People
- C. Gu
- L. Chow
- R. Mauriello
- Sharon Su
- Weiqin Lu
Organizations
- University of Central Florida