Pre-calibration electrical energy measuring chip

Abstract

This invention relates to a pre-calibrating power measuring chip, which comprises first adjustable amplifier (1), second adjustable amplifier (2), first A / D converter (11), second A / D converter (21), first digit filter (12), second digit filter (22), voltage basic circuit (3), power calculation circuit (4), clock generator (5), serial line interface circuit (6), internal memory (7) and calibrating circuit (8). The first end of calibrating circuit (8) is two-way connected with internal memory (7) and the second receive the instantaneous power and instantaneous active power from the power calculation circuit. The second adjustable amplifier (2)of calibrating circuit sends calibration analog signals.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a pre-calibration electric energy measurement chip. Background technique [0002] The traditional mechanical rotary watt-hour meters used in the power system have been gradually replaced by electronic watt-hour meters with excellent technical performance, material saving, and easy mass production. China's power system intends to complete the national urban multi-rate watt-hour meter renovation plan before 2010, further promoting the market's demand for electronic watt-hour meters. To complete the renovation plan of old-fashioned electric meters in cities and towns across the country, the total market demand will be nearly 100 million meters within seven or eight years. However, manufacturers that supply electronic watt-hour meters to the market are faced with two constraints: [0003] 1. The equipment cost is high. Electronic watt-hour meters, as civil electric energy measur...

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Problems solved by technology

[0004] 2. The cost of the adjustment production process is high, and the adjustment process of the electronic watt-hour meter as a measuring instrument accounts for a large proportion in the entire production process

After assembling various parts, the whole machine usually adopts the method of manually adjusting the test accuracy one by one. This process is time-consuming and has poor reliability, and the production cost is correspondingly high.

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