A kind of overheating protection and recovery circuit of pcie board

Abstract

The invention provides an overheating protection and restoring circuit of a peripheral component interface express (PCIE) board card. The overheating protection and restoring circuit comprises a delay power-on unit, an overheating protection unit and a restoring circuit. The overheating protection and restoring circuit of the PCIE board card enables the board card to achieve power on in a short time T, ensures power sources required by a sub-card to achieve power on according to a certain sequence, adopts a sub-card supporting slot and external power double-power-supply self-adaptive mode, supports a heat restoring function, and enables the sub-card to automatically resume normal work without starting a mainboard again when the temperature of the sub-card is reduced to a safe range after the overheating protection.

Description

technical field [0001] The invention belongs to the field of computers, and in particular relates to an overheat protection and recovery circuit for a PCIE board. Background technique [0002] Some existing PCIE sub-cards may not be recognized by the motherboard due to power-on sequence design problems, but the motherboard can be recognized after rebooting. The reason is that the sub-card is powered on too slowly and resets abnormally. The reason why many subcards are powered on slowly is due to the following reasons: As the functional requirements of subcards become more and more complex, the design of subcards is gradually complicated, and the types of power supplies on subcards are also increasing. There are also power-on sequence requirements. Most people’s usual power-on sequence control method is to let P1 control P2 to start power-on after P1ok, P2 controls P3 to power-on, and so on. Pn is controlled by P(n-1) In this case, the final power-on time of the Pn module is...

AI Technical Summary

Problems solved by technology

[0002] Some existing PCIE sub-cards may not be recognized by the motherboard due to power-on sequence design problems, but the motherboard can be recognized after rebooting. The reason is that the sub-card is powered on too slowly and resets abnormally. The reason why many subcards are powered on slowly is due to the following reasons: As the functional requirements of subcards become more and more complex, the design of subcards is gradually complicated, and the types of power supplies on subcards are also increasing. There are also power-on sequence requirements. Most people’s usual power-on sequence control method is to let P1 control P2 to start power-on after P1ok, P2 controls P3 to power-on, and so on. Pn is controlled by P(n-1) In this case, the final power-on time of the Pn module is the power ramp-up time of P1+P2+P3+...+P(n-1)+Pn, plus the delay control time from P1 to P2, and the delay from P2 to P3 until The control time from P(n-1) to Pn is often due to the too long total ramp-up time of the P1, P2, P3...Pn power modules, which causes the daughter card to be powered on too slowly, and finally the reset_L sent by the motherboard to the daughter card has been pulled high failure, and the power supply of the daughter card is not stable, so that the normal reset_L cannot be completed, resulting in abnormal functions

[0003] At present, many PCIE sub-cards generally do not have overheating protection. This overheating protection can effectively protect the board from being damaged (when the temperature of the chip on the board rises beyond the range that the chip can tolerate when the fan fails or the environment is bad, it will damage), and even if some sub-cards have overheating protection, but after the sub-cards are overheated and powered off, the PCIE link between the Chip and the main board is disconnected, and the sub-cards must reboot the main board if the sub-cards continue to work. If there are other applications that need to continue running, it is obviously not suitable to reboot the motherboard

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