Cooling device and method of controlling the same

摘要

A cooling device (22) for a CPU of a notebook computer comprises a radiation plate (23) and a fin (24) for radiating the heat from the CPU (18). When an external power supply is in use, the CPU is operated at a high clock frequency and the cooling device achieves a high cooling performance by operating a ventilation fan (26) directed to the fin (24), for example. In battery operation of the notebook computer, the CPU is operated at a low clock frequency to reduce power consumption and heat generation, in which case the ventilation fan (26) is not operated. Operation of the fan may be switched by detecting insertion/removal of a power cable, as well as by a temperature sensor and/or by user activation of a "silent" operation mode. <IMAGE>