Electric energy meter capable of improving phase correction precision

Abstract

The invention provides an electric energy meter capable of improving phase correction precision. The electric energy meter comprises a current sensor, a voltage sensor, a first analog-digital converter, a second analog-digital converter, a phase correction module and an electric energy computing module. The current sensor is used for receiving and sensing a current signal. The voltage sensor is used for receiving and sensing a voltage signal. The first analog-digital converter is used for converting an analog phase current signal into a digital current sampling signal. The second analog-digital converter is used for converting an analog phase voltage signal into a digital voltage sampling signal. The phase correction module is connected with the first analog-digital converter and the second analog-digital converter and used for correcting phases of the current sampling signal and the voltage sampling signal in real time and respectively generating a current synchronizing signal and a voltage synchronizing signal. The electric energy computing module is connected with the phase correction module and is used for receiving the current synchronizing signal and the voltage synchronizing signal, computing active electric energy and inactive electric energy and outputting computation results. The electric energy meter overcomes the defects in current / voltage signal delaying manner and is capable of realizing high-precision phase correction, simple in hardware implementation and low in system cost.

Description

technical field [0001] The invention relates to the technical field of electric energy measurement technology and circuit realization thereof, in particular, the invention relates to an electric energy meter with improved phase correction accuracy. Background technique [0002] Before the present invention, the electric energy meter phase correction adopts the mode of current / voltage signal delay. The disadvantage of this method is that the correction accuracy is restricted by the operating frequency of the ADC (analog-to-digital converter) modulator, and the phase correction can only be performed with a specific step size related to the operating frequency of the ADC modulator, making it difficult to achieve a high phase Correction accuracy. [0003] figure 1 It is an internal module structure diagram of a typical single-phase electric energy meter in the prior art. Such as figure 1 As shown, the typical single-phase energy meter 100 can be composed of a current sensor ...

AI Technical Summary

Problems solved by technology

[0018] The technical problem to be solved by the present invention is to provide an electric energy meter with improved phase correction accuracy, which can overcome the shortcomings of the existing current / voltage signal delay mode, not only can realize high-precision phase correction, but also has simple hardware implementation and low system cost. Low

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