Electric energy meter battery undervoltage monitoring device and monitoring method thereof

Abstract

The invention discloses an electric energy meter battery undervoltage monitoring device and a monitoring method thereof. The device comprises a power supply, a comparator and a latch; the power supplyis respectively connected with the comparator and the latch; a first input end of the comparator is connected with a resistance voltage division circuit of an electric energy meter internal battery,and the output end of the comparator is connected with a first input end of the latch; and the output end of the latch is connected with the signal input end of a MCU of the electric energy meter. Compared with the prior art, the latch is used for continuously latching a battery undervoltage signal until the battery undervoltage signal is detected, so that a battery undervoltage event can be accurately monitored, especially in the instantaneous voltage drop condition, and a battery undervoltage instantaneous signal can be captured in time; the monitoring device provided by the invention is simple in structure and relatively low in cost, can be applied to an internal circuit of an existing electric energy meter, and does not need to change existing design.

Description

technical field [0001] The invention belongs to the field of electric energy meter detection, and in particular relates to an electric energy meter battery undervoltage monitoring device and a monitoring method thereof. Background technique [0002] With the construction and promotion of metering automation business in the power grid system, smart energy meters have been widely promoted. However, due to the large amount of outfield operation, energy meter battery undervoltage alarms often occur, and some of them are false alarms. , so it is necessary to provide a monitoring device capable of accurately monitoring battery undervoltage. The existing battery undervoltage detection circuit is designed inside the electric energy meter. During the operation, the main control chip (MCU) samples the battery voltage and records and uploads it. However, the structure of the traditional battery voltage detection circuit is relatively simple, and the work of the MCU inspection The meth...

AI Technical Summary

Problems solved by technology

The existing battery undervoltage detection circuit is designed inside the electric energy meter. During the operation, the main control chip (MCU) samples the battery voltage and records and uploads it. However, the structure of the traditional battery voltage detection circuit is relatively simple, and the work of the MCU inspection The method is easy to miss the voltage drop that occurs during the inspection interval. The voltage drop during this period is likely to cause the MCU driver or other abnormal actions, which cannot truly reflect the battery undervoltage event. Therefore, it provides an accurate monitoring of the real battery undervoltage of the energy meter. event device is necessary

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