Verification system of electric energy measurement chip

Abstract

The invention discloses an electric energy measuring chip verification system, the sampling differential signals got from current path and voltage path of the electrified wire netting to be measured are received separately by differential amplifier of the current path and voltage path, the signals which are differentially amplified are input to the analogue / digital conversion module of current path and voltage path to generate the digital sampling differential signals which are sent to the FPGA; the digital sampling differential signals of current path and voltage path are abstracted and filedby the FPGA, the results of filtering are multiplied to generate the power data, then the power data is transformed to pulse form and output. The invention resolves the problem of channel coupling generated by the coupling capacitor. Furthermore, the differential amplifier and the analogue / digital conversion module of the current path are connected to a set of separate analog power and ground, the differential amplifier and the analogue / digital conversion module of the voltage path are connected to another set of separate analog power and ground, the invention resolves the problem of couplingfor the sharing of the analog power and ground.

Description

technical field [0001] The invention relates to a digital chip verification technology, in particular to an electric energy metering chip verification system which reduces channel coupling during the verification process of the electric energy metering chip. Background technique [0002] With the development of power electronics technology, electronic energy meters have been widely used because of their multi-functional and intelligent advantages. The energy metering chip is the core component of the electronic energy meter, which is responsible for the task of energy measurement. The accuracy of the chip directly affects the measurement accuracy of the energy meter. [0003] figure 1 It is a schematic diagram of the principle of the electric energy metering chip. Such as figure 1 As shown, V_I+ and V_I- are the differential signals of the current path generated by the grid current through the sampling resistor, and V_V+ and V_V- are the differential signals of the voltag...

AI Technical Summary

Problems solved by technology

Therefore, the deficiency of the existing power metering chip verification system lies in the coupling between the differential amplification and the voltage and current paths in the analog-to-digital conversion module, which leads to the accuracy of the measurement results of the power metering chip verification system not meeting the design requirements.

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