Patent ID: 7199597
Filing Date: 2007-04-03
Classification: G01R,G05D

Abstract:
1. A dual feedback control system for maintaining the temperature of an IC-chip near a set-point while said IC-chip dissipates a varying amount of electrical power; said system being comprised of: an evaporator for a liquid refrigerant, and an electric heater which has one face that is connected directly to said evaporator and an opposite face for coupling to said IC-chip; an evaporator controller coupled to said evaporator, and a heater controller coupled to said electric heater; said heater controller including a first feedback circuit means for sending electrical power to said electric heater with a variable magnitude that compensates for changes in said IC-chip power; and, said evaporator controller including a second feedback circuit means for passing said liquid refrigerant to said evaporator with a variable flow rate that decreases as electrical power usage in said heater increases, and increases as electrical power usage in said heater decreases.