ELECTRONIC DEVICE AND MOTHERBOARD AND PROTECTING CIRCUIT OF ELECTRONIC DEVICE

摘要

An electronic device includes a chassis with a power button and a motherboard. The motherboard includes a slot, a controller chip, a startup circuit coupling to the power button, and a protecting circuit. The protecting circuit includes an electronic switch and an AND gate circuit. The electronic switch includes a first terminal coupled to the slot, a second terminal coupled to a ground, and a third terminal coupled to a first power supply through a first resistor. The AND gate circuit includes a first input end coupled to the first power supply, a second input end coupled to the controller chip, and an output end coupled to the startup circuit. The power button is pressed down, the controller chip outputs a control signal with a high voltage to the second input end of the AND gate circuit.

主权项

1. A protecting circuit for a motherboard with a slot, a controller chip, and a startup circuit coupled to a power button, comprising:
an electronic switch comprising a first terminal coupled to the slot, a second terminal coupled to a ground, and a third terminal coupled to a first power supply through a first resistor; and an AND gate circuit comprising a first input end coupled to the first power supply, a second input end coupled to the controller chip, and an output end coupled to the startup circuit; wherein when the power button is pressed down, the controller chip outputs a control signal with a high voltage to the second input end of the AND gate circuit, and wherein when there is a short-circuiting occurs between two adjacent pins of the slot, the electronic switch is turned on, the first input end of the AND gate circuit receives a low voltage, the output end of the AND gate circuit outputs a low voltage to the startup circuit, and the startup circuit cannot perform start-up action.