Principle and Design of Current Sampling Power Frequency Antimagnetic Watt Hour Meter

Today, I'd like to introduce a national invention authorized patent - a current sampling power frequency antimagnetic watt hour meter. The patent was applied by Ningbo Samsung Medical Electric Co., Ltd. and was authorized and announced on January 23, 2018.

Content description

The invention relates to an electric energy meter, in particular to an electric energy meter with current sampling power frequency antimagnetic technology.

Invention background

Electric energy meter is a common instrument for measuring electricity, but the magnetic field interference of alternating current makes the counting accuracy of electric energy meter not high, so it is impossible to accurately measure the user's electricity consumption.

summary of the invention

In order to solve the above problems, the invention provides an electric energy meter with current sampling power frequency antimagnetic technology with good antimagnetic interference effect and small current sampling error.

The technical scheme adopted by the invention is: a current sampling power frequency antimagnetic electric energy meter, comprising: manganese copper shunt; The first current sampling module connected with the manganin shunt collects the current signal formed on the manganin shunt; A control module that receives the information collected by the first current sampling module and performs analysis and processing; The utility model is characterized in that the manganin shunt is connected with the first current sampling module through a cross loop. The two current pins of the manganin shunt cross through the via on the PCB and are connected with the first current sampling module on the PCB to form a cross loop. Further, the loop area formed by the cross loop is equal to the loop area formed by the two current pins of the manganin shunt and the manganin shunt body. The first current sampling module includes an RC low-pass filter, and the collected current signal is transmitted to the control module after passing through the RC low-pass filter.

The electric energy meter also includes a first voltage sampling module, the first voltage sampling module is connected with the control module, and the first voltage sampling module and the first current sampling module form a main loop sampling module. The first voltage sampling module includes a plurality of series voltage dividing sampling resistors, and the sampling signal is transmitted to the control module after capacitor filtering. The electric energy meter also includes a second loop sampling module, which is connected with the control module through an isolation component, which is used to isolate the main loop sampling module and the second loop sampling module to reduce the signal interference between them. A metering chip is arranged between the second loop sampling module and the isolation component, the information collected by the second loop sampling module is output after being processed by the metering chip, and the control module and the metering chip realize information transmission through the isolation component.

The isolation component includes two optocoupler isolators, one of which is used to transmit the information processed by the metering chip to the control module, and the other is used to feed back the relevant information of the control module to the metering chip. The second loop sampling module includes a second current sampling module, which is respectively connected with two parallel manganin shunts to collect the current signal of the parallel manganin shunts and transmit it to the metering chip. The second loop sampling module also includes a second voltage sampling module, and the collected information of the second voltage sampling module is input into the metering chip for processing. The second voltage sampling module includes a plurality of series voltage dividing sampling resistors, and the sampling signal is transmitted to the metering chip after capacitor filtering. The manganese copper shunt comprises two parallel pins integrally formed, three pins are formed on the connecting part connecting the two parallel pins, and the current pin is two of them.

Compared with the prior art, the invention has the advantages that after the manganese copper shunt is welded to the PCB board, the signal lines of the two current pins cross through the hole to form a cross loop B, so as to ensure that the area of the cross loop B is equal to the area of the loop a formed by the manganese copper pin and the manganese copper body, and the cross loop B and the loop a jointly form an 8-shaped loop, When the current flows through the 8-shaped loop through the manganin pin, the magnetic fields formed in area a and area B are just the same and in the opposite direction. Therefore, when disturbed by the power frequency magnetic field, area B of the cross loop can offset the magnetic field interference generated by its own loop during the operation of the electric energy meter, that is, it can offset the magnetic field interference generated by loop a, and then improve the accuracy of the current sampling signal; The electric energy meter is designed to include multiple current sampling circuits and voltage sampling circuits, which improves the application range of the electric energy meter; At the same time, an isolation component is added to the second loop sampling module formed by the second voltage sampling module and the second current sampling module, which can effectively isolate the signal interference between the second loop sampling module and the main loop sampling module composed of the first voltage sampling module and the first current sampling module, so as to further reduce the metering error of the electric energy meter and improve the accuracy.

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