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High-precision calibration method based on ATT7022E metering chip

A technology of ATT7022E and metering chip, which is applied in the field of power measurement and metering equipment, can solve the problems of parameter error, low measurement and metering accuracy of measuring equipment, poor equipment performance, etc., and achieve the effect of improving accuracy, increasing production and debugging costs, and improving performance

Active Publication Date: 2014-09-10
STATE GRID CORP OF CHINA +2
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AI Technical Summary

Problems solved by technology

When there is a difference between the actual parameters of the components and the theoretical values ​​(this is unavoidable), the parameters calculated by the theoretical values ​​will produce errors. If the errors are large, the measurement and measurement accuracy of the measuring equipment will be low, and the equipment’s The performance is poor, which is a fatal flaw in important monitoring equipment and billing and metering equipment, or will limit the scope of use of such equipment

Method used

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  • High-precision calibration method based on ATT7022E metering chip
  • High-precision calibration method based on ATT7022E metering chip
  • High-precision calibration method based on ATT7022E metering chip

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Embodiment Construction

[0024] Refer to attached Figure 1~3 , the present invention is based on the theoretical calculation method provided by the manufacturer of the ATT7022E metering chip, and calculates the theoretical value according to the design requirements of the actual product, specifically including:

[0025] 1) Determine the rated value of the primary side voltage and current of the equipment access line;

[0026] 2) According to the voltage and current ratings determined in step 1), determine the voltage transformer and current transformer, and obtain the secondary measurement output mode and output value of the voltage transformer and current transformer;

[0027] 3) Determine the resistance value of the front-end sampling resistor of the ATT7022E metering chip according to the secondary measurement output mode and output value of the voltage transformer and current transformer described in step 2);

[0028] 4) Determine the pulse constant N of the metering pulse according to the desig...

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Abstract

The invention discloses a high-precision calibration method based on an ATT7022E metering chip, and relates to application of the ATT7022E metering chip, in particular to electric power measuring and metering equipment. The method can greatly improve measuring and metering precision of the equipment of the kind and substantially reduce the workload in the factory calibration stage of the equipment. According to the calibration method, based on a theoretical calculation method provided by an ATT7022E metering chip factory, a theoretical value is calculated according to design requirements of an actual product, and the error between the interval t1 of pulses captured by a micro controller (MCU) and the theoretical value t2 is kept within an acceptable small range; at the moment the MCU remembers an up-to-date value of an HFConst register, and the value is written into a high-frequency pulse literal register each time the equipment is started; therefore, the metering accuracy of the ATT7022E metering chip is improved.

Description

technical field [0001] A high-precision calibration method based on the ATT7022E metering chip of the present invention relates to the application of an ATT7022E metering chip, relates to power measurement and metering equipment, and is a method that can greatly improve the measurement and metering accuracy of this type of equipment, and can greatly improve A method to simplify the workload of the device during the factory calibration phase. Background technique [0002] ATT7022E is a measurement and metering chip with relatively excellent performance. At present, many equipment manufacturers at home and abroad are using this chip to develop products. Chip manufacturers provide users with reference designs, especially recommended values ​​for the selection of front-end sampling circuit parameters and the selection of related register values ​​that directly affect the measurement and metering accuracy. The theoretical parameters of peripheral electronic components are calcul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/04
Inventor 戴绍勇张雷张少云
Owner STATE GRID CORP OF CHINA
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