Energy pulse output method and device of electric energy meter and electric energy meter
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HI TREND TECH SHANGHAI
- Publication Date
- 2011-07-20
Smart Images
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Abstract
Description
technical field
[0001] The invention relates to the field of electronics, in particular to an electric energy meter in the field of electronics. Background technique
[0002] The energy meter samples the analog voltage and current through a Sigma-delta analog-to-digital converter (Σ-ΔADC) and converts them into their digital form, so that the subsequent metering circuit can calculate data such as electric energy, power, and effective value.
[0003] The basic structure of the existing electric energy meter is as follows: figure 1 As shown, the voltage value U and the current value I are respectively converted into corresponding digital signals u and i through the Σ-Δ analog-to-digital converter, which respectively represent the digital signals of the voltage value and current value, and the instantaneous power p is obtained after multiplying u and i (t), the instantaneous power passes through a low-pass filter LPF1 to obtain filtered instantaneous power P1, and the filtered...