Browse Prior Art Database

Individual Chip Temperature Controller

IP.com Disclosure Number: IPCOM000119766D
Original Publication Date: 1991-Feb-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 1 page(s) / 36K

Publishing Venue

IBM

Related People

Abrami, AJ: AUTHOR [+3]

Abstract

High power chip circuit families are difficult to temperature control when subjected to high temperature environments as used in reliability stress testing. Discrete chip temperature control that allows uniform heating and cooling is preferred. The invention comprises the use of individual chip temperature monitoring and control through customized piston heaters, thermocouples and cold plate.

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Individual Chip Temperature Controller

      High power chip circuit families are difficult to temperature
control when subjected to high temperature environments as used in
reliability stress testing. Discrete chip temperature control that
allows uniform heating and cooling is preferred.  The invention
comprises the use of individual chip temperature monitoring and
control through customized piston heaters, thermocouples and cold
plate.

      The figure illustrates the invention schematically.  A single
thermocouple controlled heater cartridge is placed inside a piston
for each corresponding chip location.  The pistons are then embedded
in a cold plate.  The thermocouple provides the relative temperature
feedback to a heater control circuit which switches the power on and
off to the heating element.  When the heater is OFF, the surrounding
cold plate becomes a heat sink which lowers the chip temperature.
When the heater is ON, the flow of heat is retarded which raises the
chip temperature.  This scheme is then repeated to allow for discrete
temperature control of multiple chips on a common carrier.

      Disclosed anonymously.