刀片服务器风扇控制及系统实现

摘要

针对刀片服务器散热系统的高稳定性、高可靠性需求,设计了一种基于MPC8245+FPGA结构的风扇控制系统,采用了一种基于阈值的风扇调速控制策略,只有当温度的变化达到了预设的阈值之后风扇的转速才会在温度上升曲线及温度下降曲线之间转换,从而大大减少了温度波动导致风扇频繁调速而产生的非稳态噪声.通过设计改进的复位电路,利用单稳态触发器和PWM结合控制,实现了对风扇转速的可靠控制,保证了系统的散热.各种环境试验表明,本文设计的刀片服务器风扇控制系统能稳定的对风扇转速进行控制.%A highly stable and reliable blade server cooling system based on MPC824S + FPGA fan controlled system is introduced, and threshold-based fan speed control strategy is used. In the proposed control strategy only when the temperature reaches a preset threshold would the fan speed convert between temperature rise curve and the temperature drop curve, non-stationary noises caused by the frequently fan speed modification to which the temperature fluctuation led, have been greatly reduced. The reliable, precise fan speed control method is implanted using improved reset circuit and PWM control circuit. The result of various tests and trials show that the blade server fan control system can control the fan speed precisely.