Double-current comparison circuit for electric energy metering chip

Abstract

The invention relates to a double-current comparison circuit for an electric energy metering chip. The double-current comparison circuit comprises a comparison module, a first signal sampling module, a second signal sampling module, a threshold comparator, a timing module, a first high-pass filter, a first integration module, a second high-pass filter and a second integration module, wherein the first signal sampling module, the second signal sampling module, the threshold comparator and the timing module are respectively connected with the comparison module, the first high-pass filter and the first integration module are sequentially connected between the output end of the first signal sampling module and the input end of the comparison module, and the second high-pass filter and the second integration module are sequentially connected between the output end of the second signal sampling module and the input end of the comparison module. Detection during current imbalance is achieved by taking samples from two current passages and automatically comparing sizes of currents of the two current passages, simultaneously accuracy of double-current comparison is ensured, error judgment and wrong judgment are reduced, and accordingly the electric energy metering chip is led to have a reliable electricity stealing prevention function.

Description

technical field [0001] The invention relates to an internal circuit structure of an electric energy metering chip, in particular to a dual current comparison circuit used in the electric energy metering chip and capable of realizing the design requirements of electric energy metering against electric theft. Background technique [0002] At present, the anti-theft technology of electronic energy meters is becoming more and more important in the energy meter industry. The electric energy meter market in different countries and regions requires the anti-theft measurement of electric energy meters to varying degrees. The types of electricity theft and anti-theft technology that people are aware of are increasing, and the corresponding anti-theft technology is researched every year for new electricity theft behaviors. At the same time, in the field of electric energy metering chips, corresponding requirements The chip has anti-theft detection and metering functions. [0003] Com...

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Problems solved by technology

However, the algorithm for RMS calculation requires more hardware implementation, which greatly increases the cost of the chip

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