Low-temperature protector of communication electronic system

Abstract

The invention discloses a low-temperature protector of a communication electronic system. The protector is connected with a power supply circuit which is provided for the communication electronic system; and an input end, an output end and an earth terminal of the protector are respectively connected with an input end, an output end and an earth terminal of the power supply circuit correspondingly. The protector comprises a temperature sampling circuit, an amplifying circuit and a power switching circuit, wherein the temperature sampling circuit, the amplifying circuit and the power switching circuit are connected in sequence; the temperature sampling circuit is used for sampling the temperature of the work environment of the communication electronic system and converting the sampled temperature signals into voltage signals as well as outputting the voltage signals to the amplifying circuit; the amplifying circuit is used for amplifying the input voltage signals and outputting the processed analog signals to the power switching circuit; and the power switching circuit is used for controlling the output end of the power supply circuit to switch on or switch off a power supply in accordance with the input analog signals. According to the invention, the communication electronic system can switch off the power supply automatically after the ambient temperature is reduced below a threshold value and also return to normal automatically after the ambient temperature rises to the threshold value.

Description

technical field [0001] The invention relates to the reliability design of electronic circuits in the communication field, in particular to a low temperature protection device for communication electronic systems. Background technique [0002] Communication systems, especially systems such as base stations and remote radio units (RRU, Remote Radio Unit) that require long-term continuous work, may have a huge change in ambient temperature during their long-term continuous work. Too high or too low ambient temperature will cause this type of communication system to work abnormally. Moreover, many systems work abnormally due to this, and still cannot start to work normally after the ambient temperature returns to normal. This is mainly caused by the system not shutting down in time or entering the protection state when the system is working at a too low ambient temperature. [0003] For the abnormal operation of the system caused by too low ambient temperature, many people thi...

AI Technical Summary

Problems solved by technology

After the ambient temperature drops to a certain level, some chip devices can still work normally, while another part of the chip has already worked abnormally due to the low device junction temperature. If the pins of this part of the abnormally working chip are realized through the internal protection circuit To prevent current backfeeding, when it works abnormally, the protection circuit of the pin will not be able to prevent current backfeeding, and some other devices that work normally will continue to inject current into these pins that have lost their protection. , for a long time, these devices with higher minimum junction temperature will lose their efficacy

If the failure of the device is irrecoverable, the board or system will still not work normally after the ambient temperature returns to normal.

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