Electric energy meter detection circuit and intelligent electric meter

Abstract

The invention discloses an electric energy meter detection circuit and an intelligent electric meter. The electric energy meter detection circuit comprises a high-voltage detection unit, a low-voltagedetection unit, and a main control unit. The input end of the main control unit is respectively connected with the output ends of the high-voltage detection unit and the low-voltage detection unit, the high-voltage detection unit is used for judging power failure and power-on of an electric meter, and the low-voltage detection unit is used for controlling the power-on work of the electric meter;a high-voltage rectifying circuit and a high-voltage voltage division circuit are arranged in the detection circuit, few capacitors are arranged in the high-voltage rectifying circuit and the high-voltage voltage division circuit, detection signals are transmitted more quickly by adopting high-voltage level signals, the response time of power failure of the electric meter is shortened, and the reliability of detection data of the electric energy meter is improved. Extra battery power consumption caused by insufficient power-down retention time can be avoided, power-down switching-off can be configured without configuring a high-capacity electrolytic capacitor, and the cost of a detection circuit is saved.

Description

technical field [0001] The invention relates to the field of circuits, in particular to an electric energy meter detection circuit and an intelligent electric meter. Background technique [0002] Most of the existing smart meters use the internal low-voltage DC power supply voltage divider circuit to judge power on and off, that is, divide the system’s 12V DC power supply to about 1.25V~3.30V, and output it to the built-in ADC or comparator of the MCU. , the divided voltage signal is lower than the power-on / off threshold set by the MCU, and then the single-chip microcomputer system triggers a power-down interrupt and enters a low-power consumption mode. The existing low-voltage DC power supply voltage divider circuit mainly has the following two problems: 1. The response time of the smart meter system is long, which is not conducive to data storage during power failure, and it is difficult to configure power failure switching. There is generally a delay of 500-1500ms from t...

AI Technical Summary

Problems solved by technology

The existing low-voltage DC power supply voltage divider circuit mainly has the following two problems: 1. The response time of the smart meter system is long, which is not conducive to data storage when the power is off, and it is difficult to configure the power-off switch

When an undervoltage or electricity theft event occurs, the 12V DC power supply of the meter may fluctuate repeatedly up and down the set power-down threshold, causing the meter to reset repeatedly, making it impossible to perform normal detection and measurement, making the detection data unable to be saved normally, which may cause users The phenomenon that electricity consumption is not billed

Images