| 摘要 |
A protection system includes a baseboard management controller (BMC), N fans, a power on unit, a power supply, and a switching unit. The switching unit includes an AND gate, a transistor, and a first resistor. During operation the fans each output an operating signal to the BMC. The BMC counts the operating signals received. When the count is less than N, the power-off pin outputs a low level signal, so that the output pin of the AND gate outputs a low level signal, and the transistor turns off. The power supply then receives a high level signal and stops supplying power.
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