| 摘要 |
<p>PURPOSE:To reduce the noise of a cooling fan and to extend its life by rotating the cooling fan in a low speed in accordance with the temperature of air flowed into an information processor. CONSTITUTION:When an intake air temperature T exceeds an operating temperature T1, the voltage supplied to a cooling fan 2 is switched to a high voltage V1 by the operation of a temperature voltage converting circuit 11 and the fan 2 is rotated in a high speed to enhance the cooling effect of each unit. When the intake air temperature falls to be lower than a release temperature T2, the voltage supplied to the cooling fan 2 is switched to a low voltage V2 by the operation of the temperature voltage converting circuit 11 and the cooling fan 2 is rotated in a low speed. Thus, the noise is reduced and the life of the cooling fan is extended and the energy is reduced in the condition of low temperature.</p> |
