Patent ID: 6285150
Filing Date: 2001-09-04
Classification: F04D,Y02B,Y10S

Abstract:
A method for controlling an operating voltage of a fan in an electrical equipment for cooling electrical physical elements used in the electrical equipment, comprising the steps of:monitoring a temperature of an output diode, the temperature of the output diode being indicative of the greatest power of an output circuit of a power supply of the electrical equipment, said output diode having a temperature response corresponding to power being fed by the power supply to the electrical equipment so that its temperature is thus related to how hot other physical elements in the equipment will become;controlling an operating voltage of the fan as a function of the temperature of the output diode; andthe operating voltage of the fan being controlled such that the operating voltage of the fan is first regulated at a constant minimum level until a first temperature is reached by the output diode at which time the operating voltage of the fan is regulated to rise continuously as a function of the output diode temperature until a second higher output diode temperature is reached at which the fan voltage is at a maximum, the second temperature being selected such that all physical elements in the electrical equipment including the output diode are still below a maximum permissible operating temperature.