Accession Number:

AD0752076

Title:

Investigation of Novel Heat Removal Techniques for Power Transistors.

Descriptive Note:

Interim technical rept. 15 Nov 71-15 Aug 72,

Corporate Author:

HUGHES AIRCRAFT CO FULLERTON CALIF GROUND SYSTEMS GROUP

Personal Author(s):

• Merrigan,M. A.

Report Date:

1972-10-01

Pagination or Media Count:

52.0

Abstract:

The feasibility of new cooling methods for VHF power transistors capable of providing a reduction in junction temperature of 33, compared to conventionally packaged devices has been investigated. Design objective for the transistors are a minimum power dissipation of 25 watts CW power from a 28-volt supply with a minimum power gain of 6 dB. The electrical characteristics of the devices are to be within 10 of conventional devices, the volume no more than 4 times, and the weight no more than 5 times that of equivalent hermetically sealed devices. Achievement of these objectives was based on the application of heat pipe cooling techniques to the chip surface, within a standard TO-package. Author

Descriptors:

• *TRANSISTORS
• *HEAT EXCHANGERS
• COOLING
• DIELECTRICS
• HALOGENATED HYDROCARBONS
• COMPATIBILITY
• LIQUIDS
• VERY HIGH FREQUENCY
• FEASIBILITY STUDIES

Subject Categories:

• Electrical and Electronic Equipment
• Air Conditioning, Heating, Lighting and Ventilating

Distribution Statement:

APPROVED FOR PUBLIC RELEASE