Pre-calibrated electric energy metering circuit and calibration method

Abstract

The invention discloses a pre-calibrated electric energy metering circuit and a calibration method. The pre-calibrated electric energy metering circuit and the calibration method which at least comprise a sampling module, an analog to digital conversion module, a digital signal processing module, a calibration register, an interface module and a calibration module, wherein the calibration register receives calibration data written in by a calibration control console through an interface to control a working state of the calibration module, and the calibration module controls the working state according to the set of the calibration register, and adjusts the transfer function of the modulator of the analog to digital conversion module. The pre-calibrated electric energy metering circuit and the calibration method can realize electric energy metering precision pre-calibration of an electric energy meter, simultaneously is compatible with peripheral circuits of an original electronic electric energy meter and a printed circuit board (PCB) is unnecessary to design afresh.

Description

technical field [0001] The invention relates to the field of metering chips, in particular to a pre-calibrated electric energy metering circuit and a calibration method applied to electric energy metering circuits. Background technique [0002] figure 1 It is a structural schematic diagram of an existing electrical energy metering circuit without a calibration function. Such as figure 1 As shown, the energy metering circuit without calibration function includes a sampling module, an analog-to-digital conversion module, a digital signal processing module, a reference module, and a clock frequency conversion module. The sampling module samples the current signal and voltage signal and sends it to the analog-to-digital conversion module for Analog-to-digital conversion, the converted current digital quantity and voltage digital quantity are sent to the digital signal processing module for processing to generate measurement parameters. [0003] However, after figure 1 The me...

AI Technical Summary

Problems solved by technology

However, for metering circuits without communication interfaces, it is often necessary to design modules such as calibration register circuits, communication interface circuits, and digital signal operation circuits, adding communication pins, which cannot be compatible with the original peripheral circuits, and the PCB board must be redesigned, which is costly

Images