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Meter

A technology of electric energy meter and electrical connection, applied in the field of electric energy meter, can solve the problems of circuit interference of metering chip, damage of metering chip, etc., and achieve the effect of ensuring normal operation

Active Publication Date: 2020-12-18
NANJING DIANRUN TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the end of the piezoresistor connected to the incoming line is also electrically connected to the ground pin of the metering chip, so that the large current discharged from the piezoresistor will inevitably interfere with the circuit of the metering chip
When the interference is weak, the metering chip works abnormally, such as the induction current, power, etc.; when the interference is severe, if the disturbance voltage loaded on the metering chip exceeds the maximum withstand voltage that its pins can withstand, it will Causes damage to the metering chip

Method used

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Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0029] An embodiment of the present invention provides an electric energy meter, which includes: a metering chip, a shunt, and a piezoresistor, wherein:

[0030] The first welding point of the shunt is electrically connected to the ground pin GND of the metering chip, and the ground pin GND of the metering chip is grounded;

[0031] The shunt is electrically connected to the first end of the piezoresistor, and the second end of the piezoresistor is electrically connected to the neutral terminal.

[0032] In the electric energy meter provided by the embodiment of the present invention, by electrically connecting the first welding point of the shunt to the ground pin GND of the metering chip, the ground pin GND of the metering chip is gr...

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Abstract

The invention discloses an electricity meter and belongs to the technical field of electricity meters. The electricity meter includes: a metering chip, a divider, and a piezoresistor, wherein a firstwelding spot of the divider is electrically connected with a ground pin of the metering chip, the ground pin of the metering chip is grounded, the divider is electrically connected with the first endof the piezoresistor, the second end of the piezoresistor is electrically connected with the zero line end. The problem of the prior art that high current released from the piezoresistor causes unavoidable disturbances to metering chip circuitry is solved, and normal running of the electricity meter is ensured.

Description

technical field [0001] The invention relates to the technical field of electric energy meters, in particular to an electric energy meter. Background technique [0002] An electric energy meter is an instrument used to measure electric energy, and it is usually connected to the power supply system during use. In order to avoid the problem that the excessive instantaneous voltage (for example, thousands of volts) provided by the power supply system is loaded on the incoming line of the electric energy meter and cause damage to the electric energy meter, a piezoresistor is usually set in the electric energy meter, and one end of the piezoresistor is passed through The cable is connected to the incoming terminal, and the other end of the varistor is grounded. When high voltage is applied to the incoming terminal of the electric energy meter, the resistance of the piezoresistor decreases to shunt the current to realize the protection of the sensitive electronic components in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R11/02
CPCG01R11/02
Inventor 沈镇炜周旋朱朦朱蓬辉滕世玉朱海双
Owner NANJING DIANRUN TECH