Pre-calibration electrical energy measuring chip

A technology for measuring electric energy and calibrating circuits, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problems of high cost of adjustment production process, high production cost, and poor reliability, so as to improve the accuracy and stability of comprehensive testing, Inexpensive effect

Inactive Publication Date: 2005-01-19
上海华园微电子技术有限公司
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

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...

Method used

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  • Pre-calibration electrical energy measuring chip
  • Pre-calibration electrical energy measuring chip
  • Pre-calibration electrical energy measuring chip

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0022] Depend on figure 1 It can be seen that the present invention includes a first adjustable amplifier 1, a second adjustable amplifier 2, a first analog-to-digital converter 11, a second analog-to-digital converter 21, a first digital filter 12, a second digital filter 22, a voltage Reference circuit 3, power calculation circuit 4, clock generator 5, serial interface circuit 6, internal register 7, calibration circuit 8;

[0023] The first adjustable amplifier 1 outputs the current signal extracted from the current transformer or shunt to the power calculation circuit 4 through the first analog-to-digital converter 11 and the first digital filter 12;

[0024] The second adjustable amplifier 2 outputs the voltage signal extracted from the line voltage attenuator connected to the voltage network to the power calculation circuit 4 through the ...

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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...

Claims

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Application Information

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IPC IPC(8): G01R22/00G01R35/04
Inventor 申强印义中印义言
Owner 上海华园微电子技术有限公司
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