Electricity information acquisition terminal power supply and metering unit protection circuit

Abstract

The invention discloses an electricity information acquisition terminal power supply and metering unit protection circuit. AC input ends are connected with common-mode chokes; output ends of the common-mode chokes are connected with high-throughput piezoresistors in parallel and are connected with low-resistance and high-power thermistors; the output ends of the low-resistance and high-power thermistors are connected with fast reaction piezoresistors; the fast reaction piezoresistors are connected with a rectifier unit; the rectifier unit is connected with an overvoltage amplitude limiting output unit; and the overvoltage amplitude limiting output unit is connected with a high-frequency switch conversion and control unit. The technical problems that a terminal is scrapped to bring losses to a user and the like since the electricity information acquisition terminal power supply and metering unit protection circuit in the prior art is easily damaged under a lightning impulse, a terminal component can be burnt out and a printed circuit board can be damaged are solved.

Description

technical field [0001] The invention belongs to the power source and metering system safety protection technology of an electric power user's metering automation terminal, and in particular relates to a power source and a metering unit protection circuit of a power information collection terminal. Background technique [0002] With the continuous popularization of smart grids, metering automation terminals are widely used. However, during the thunderstorm season, the power distribution network near the terminal is likely to be directly impacted by lightning. Such a result is likely to damage a large area of ​​nearby metering automation terminals, such as concentrators, load management terminals or distribution transformer monitoring and metering terminals. Wait. In the actual field, the main part of various terminals damaged by lightning impact is often the front-end part of the power supply of the terminal, which may cause serious consequences such as burning of terminal c...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a power supply and metering unit protection circuit for the power consumption information collection terminal in the prior art, so as to solve the problem that the terminal power supply and the metering unit of the power consumption information collection terminal in the prior art are easily damaged when they are struck by lightning, and terminal components may appear Burning, damage to printed circuit boards lead to terminal scrapping, bringing losses to power users and other technical problems

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