Electric Energy Metering Circuit Structure and Method for Realizing Measurement Accuracy Pre-calibration Function

Abstract

The invention relates to an electric energy measuring circuit structure capable of achieving a function of pre-calibration of measurement accuracy. The structure comprises a reference module, a sampling module, an analog-digital conversion module, a clock and frequency conversion module, a digital signal processing module, a calibration register and interface circuit and a calibration module. The invention further relates to a method for achieving the pre-calibration of accuracy of the electric energy measuring circuit on the basis of the circuit structure. According to the electric energy measuring circuit structure capable of achieving the function of the pre-calibration of the measurement accuracy and the method, the function of calibrating the measurement accuracy of the electric energy measuring circuit is achieved, calibration structure is simple, adding of a large number of circuit sizes is not needed, when the electric energy measuring circuit structure is applied, an original electric watt-hour meter peripheral circuit is compatible with the structure completely, redesigning of a printed circuit board (PCB) is not needed, and meanwhile measurement accuracy of an electric energy meter can be improved effectively, correction table cost is reduced notably, and the electric energy measuring circuit structure is an effective and flexible choice in the field of electric energy measuring chips.

Description

technical field [0001] The invention relates to the field of metering chips, in particular to the technical field of electric energy metering circuits, in particular to an electric energy metering circuit structure and method for realizing the pre-calibration function of measurement accuracy. Background technique [0002] Before the electronic energy meter leaves the factory, its measurement accuracy needs to be calibrated to meet the requirements of the technical specifications and standards for energy measurement. [0003] see figure 1 As shown, it is a schematic block diagram of the structure of an existing energy metering circuit without a calibration function. At present, there are two main calibration methods commonly used for electronic energy meters: hardware calibration and software calibration. [0004] Hardware calibration, on the electronic energy meter PCB application board, the voltage sampling channel is designed with a resistor divider network, and the samp...

AI Technical Summary

Problems solved by technology

For metering circuits without communication interfaces, it is 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

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