Main board power supply protection circuit

Abstract

The invention relates to a power supply protection circuit for a main board used for protecting the main board of a power cord in an unconnected central processor unit. The power supply protection circuit for the main board comprises an input and output controller, an advanced configuration and a power interface controller. The power supply protection circuit for the main board also comprises a controlling signal generation circuit and an enabling signal generating circuit. The controlling signal generation circuit generates a controlling signal according to the power supply condition of the central processor unit and the signal is sent into the input and output controller. At the same time, the enabling signal generating circuit generates an enabling signal which causes the input and output controller to process the controlling signal normally. When the power cord of the central processor is wrongly connected, the controlling signal causes the input and output controller to send a shutdown signal to the advanced configuration and the power interface controller to stop power supply. The power supply protection circuit of the main board can carry out protection for the main board with an occurrence of abnormal power state on the central processor unit.

Description

technical field [0001] The invention relates to a mainboard power supply protection circuit, in particular to a mainboard power supply protection circuit which can automatically detect the power supply status of a CPU (Central Processing Unit, central processing unit). Background technique [0002] A pin of the computer power plug transmits a power control signal (PSON# signal), which is used to control the power supply. When starting up, after the power switch button (Power Button) on the computer is pressed, the PSON# signal is controlled by the I / O (Input / Output input and output) controller to change to a low level, and the power supply starts to supply power; , keep pressing the power switch button for about 4 seconds, the I / O (Input / Output input and output) controller will stop outputting the low-level PSON# signal after 4 seconds, and the power supply 2 will stop supplying power. This process is a forced shutdown Press the switch button for 4 seconds to shut down the ...

AI Technical Summary

Problems solved by technology

In this case, after the user turns it on, the power supply cannot supply power to the CPU, but still supplies power to the motherboard.

If this situation continues for a period of time, and because the initial enable level of the I / O (input and output) controller may be low level (high level active), at this time some I / O controllers of the main board It will enter the suspended state and will not receive or send any input and output signals. The power switch signal will not be recognized, resulting in the failure to cut off the power supply of the motherboard. The motherboard will be in a non-working state for a long time, which will cause great damage to the motherboard

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