Patent ID: 7533284

Claim:
A temperature control system, used in a portable computer, said temperature control system comprising: a first control part located in an external power transformer for generating a first control signal for controlling the operation state of an operation processing unit of said portable computer when said portable computer is powered by said external power transformer, said first control part comprising: a first temperature sensor used for detecting a first temperature of said external power transformer, thereby generating a first reference voltage which decreases when said first temperature increases; and a first comparing circuit, comprising: a first input terminal used for receiving said first reference voltage; and a second input terminal used for receiving a first comparing voltage generated from the load current of said external power transformer, thereby outputting said first control signal, wherein said first control signal changes from a high voltage level to a low voltage level when said first comparing voltage becomes higher than said first reference voltage, and said first control signal changes from said low voltage level to said high voltage level when said first comparing voltage becomes lower than said first reference voltage; and a second control part connected to said operation processing unit of said portable computer and used for generating a second control signal based on said first control signal for controlling the operation state of said operation processing unit when said portable computer is powered by said external power transformer.