Overcurrent protection circuit of airborne computer product

By designing an overcurrent protection circuit containing multiple circuit components, the problem of slow and irreversible traditional fuse protection is solved, fast and reversible overcurrent protection is achieved, and the safety of onboard computer products is improved.

CN119742713AActive Publication Date: 2025-04-01XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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Patent Information

Application Number
CN202411810143.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-10
Publication Date
2025-04-01
Estimated Expiration
2044-12-10

AI Technical Summary

Technical Problem

The traditional overcurrent protection design of on-board computer power supply uses a fuse, which is slow and irreversible, which may cause abnormal power supply bus bars before fuse, affecting the safety of on-board computer products.

Method used

An overcurrent protection circuit including power switch, isolation circuit, current sampling and detection circuit, signal conditioning circuit, comparison circuit and level maintenance circuit is designed. Overcurrent detection and protection are realized through current sampling detection and signal conditioning, and the level maintenance circuit ensures the effectiveness of the protection signal.

Benefits of technology

It realizes fast and reversible overcurrent protection, prevents overcurrent failures from affecting the onboard equipment, and improves the safety and reliability of onboard computer products.

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Abstract

The invention provides an over-current protection circuit of an airborne computer product, which belongs to the technical field of airborne computer power supply and distribution management and comprises a power switch and an isolation circuit used for controlling a power supply output switch of a power supply. The current sampling detection circuit is used for establishing a linear relation between the detected current and the output voltage; the signal conditioning circuit is used for conditioning an output signal of the current sampling detection circuit, and when the flowing current is 0A, the output voltage of the signal conditioning circuit is 0V; the comparison circuit is used for comparing the voltage output by the signal conditioning circuit with a preset reference voltage, judging whether overcurrent occurs or not, and outputting an overcurrent signal and closing a power output channel when overcurrent occurs; the level maintaining circuit is used for maintaining the over-current signal and preventing the over-current signal from losing efficacy; after the overcurrent fault is eliminated, the overcurrent protection signal is reset through the overcurrent protection reset signal, and the power output channel is opened again. According to the invention, the safety and reliability of airborne computer products are improved.
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