| 摘要 |
An over-heat protecting circuit and a system circuit board thereof are disclosed. The over-heat protecting circuit receives a voltage-detecting signal, a control signal, and an over-heat signal, and comprises a first logic circuit, a memory circuit, and a second logic circuit. The first logic circuit receives and processes the voltage-detecting signal and the over-heat signal to output a first logic signal. The memory circuit receives and processes the first logic signal and the control signal to output a latching signal. The second logic circuit receives and processes the latching signal and the control signal to output a power-control signal. Eventually, the power supplier stops outputting an operating voltage according to the power-control signal.
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