A Cold Backup Interface Circuit for Digital Signals

Abstract

The invention discloses a cold backup interface circuit for digital signals, comprising a driving unit, a main receiving unit and a backup receiving unit. Each receiving unit is composed of a power voltage VCC, an isolation diode D1, a compensation diode D2, a resistor R2, a resistor R3, a power ground GND and a receiving chip, wherein the power voltage VCC is connected with the anode of the isolation diode D1 and the anode of the compensation diode D2 through the resistor R2, the cathode of the isolation diode D1 is connected with the driving unit, the cathode of the compensation diode D2 is connected with the input end of the receiving chip and one end of the resistor R3, the receiving chip performs level conversion and buffering on received signals, the output end of the receiving chip is used as the output end of the receiving unit, and the other end of the resistor R3 is grounded. The cold backup interface circuit for digital signals of the invention is simple in structure and low in power consumption, can realize signal isolation under the condition of power failure, avoids damage to the receiving chip not in work, and solves the problem of electric crosstalk.

Description

technical field [0001] The invention relates to a digital signal cold backup interface circuit, which is used for cold backup processing at the single-end digital signal interface of various level standards. Background technique [0002] In electronic systems with high reliability requirements, such as video electronic systems for aerospace cameras, the processing method of the main backup circuit plays an important role, especially the processing method of the cold backup circuit, which can greatly reduce the power consumption of the entire system. The need for this primary backup processing method is especially common in electronic systems in the aerospace field. In electronic systems in the aerospace field, it is usually difficult to replace, update or maintain hardware on-orbit. Through the main backup method, when a certain link fails, the circuit can be switched to backup work, and the system can still maintain normal operation. Thereby greatly improving the reliabili...

AI Technical Summary

Problems solved by technology

Although this method can achieve the required functions very well, it requires an additional isolation chip and two additional control signals to perform active / standby switching with the receiving end circuit, and the circuit design is complicated.

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