Power supply port used for protecting remote metering terminal

Abstract

The invention discloses a power supply port used for protecting a remote metering terminal. The power supply port used for protecting the remote metering terminal comprises a resistor R, a comparator T, a field-effect tube P, an inductance coil L and a gas discharge tube GDT, wherein the resistor R is connected in series between the two input ends of the comparator T; the grid electrode of the field-effect tube P is connected with the output end A of the comparator T, the source electrode of the field-effect tube P is sequentially connected with the inductance coil L and the gas discharge tube GDT in series, and the drain electrode of the field-effect tube P is connected with a common terminal of the resistor R and the comparator T; the inductance coil L and the gas discharge tube GDT are further connected with an internal power supply; one end of the gas discharge tube GDT is grounded. Through the principle, a special anti-surge circuit is arranged on the power supply port of the remote metering terminal, the port is protected from being damaged, and long-term normal operation of the remote metering terminal is ensured.

Description

technical field [0001] The invention relates to a power supply port protection circuit, in particular to a port used to protect the power supply of a remote measurement terminal. Background technique [0002] In geographic information collection, disaster monitoring and early warning, and digital urbanization, a large number of collection points are required. The collection points are scattered in every corner, and some are even installed in remote places. The operating environment of the equipment is mostly in the wild. With the gradual development of automation, we have higher and higher requirements for automation of data acquisition and equipment control, and higher and higher requirements for remote measurement and control. In response to these characteristics, remote control terminals are now used to realize automatic control and data collection of remote equipment and remote monitoring of information. These remote control terminals all need to supply power to the dev...

AI Technical Summary

Problems solved by technology

These remote control terminals need to supply power to the device through the power port to ensure its normal operation, but there are usually multiple directions of current at the power port at the same time hitting the port and impacting the power port at the same time, resulting in paralysis of the circuit

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