Patent ID: 6822202
Filing Date: 2004-11-23
Classification: G05D,H01L

Abstract:
A temperature control system, comprising:a target having a target temperature; a temperature sensor for sensing said target temperature; a controller operatively connected to said temperature sensor, said controller for producing cooling control signals and heating control signals; a re-circulation loop for retaining a temperature control fluid such that the temperature control fluid is in thermal communication with said target, said re-circulation loop including: a pump for circulating said temperature control fluid; a cooling heat exchanger; a cooling control valve; a cooling fluid passage interconnecting said cooling heat exchanger and said cooling control valve; a heating heat exchanger; a heating control valve; a heating fluid passage interconnecting said heating heat exchanger and said heating control valve; and a through passage; wherein said cooling control valve selectively enables part of said temperature control fluid to circulate through said cooling heat exchanger in response to said cooling control signals; wherein said heating control valve selectively enables part of said temperature control fluid to circulate through said heating heat exchanger in response to said heating control signals; and wherein said controller selectively produces said cooling control signals and said heating control signals such that said target temperature moves toward a predetermined temperature.