| 摘要 |
A circuit for protecting a motherboard includes a power button ( 30 ), a first heat-generating component ( 10 ) of the motherboard with a first output terminal, a second heat-generating component ( 40 ) of the motherboard with a second output terminal, a first switch circuit ( 20 ) connected between the first heat-generating component and the power button; and a second switch circuit ( 50 ) connected between the second heat-generating component and the power button. Wherein when the first heat-generating component reaches its maximum safe operating temperature, the first output terminal is at low level, the first switch circuit connects the power button to ground to power down the computer and protect the motherboard from overheating; when the second heat-generating component reaches its maximum safe operating temperature, the second output terminal is at high level to turn on the second switch circuit which results in the power button connecting to ground to power down the computer and protect the motherboard from overheating.
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