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具有冷却风扇的电源供应器,其风扇运转的控制条件是什么?

2020-11-05 18:43

冷却风扇相对于电源供应器中的其他零件而言,其寿命是相对较短的(通常平均故障时间约5000~100000小时);故若能改变其运转的方式,就可以延长使用寿命。一般而言风扇的控制方式有以下2种设计:

温度控制:

当温度开关侦测到电源供应器内部温度超过其设定值时,则冷却风扇将会以全转速运转;反之,当低于其设定值时,将会停止运转或者以一半的转速运转。除此之外,在某些电源供应器中,冷却风扇是藉由一种非线性控制的方式来控制其转速随着内部不同的温度同步做改变。

负载控制:当电源供应器的负载超过其设定值时,则冷却风扇将会以全转速运转;反之,当低于其设定值时,将会停止运转或者以一半的转速运转。

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