Communication circuit for smart electric meter

A technology of communication circuit and smart meter, which is applied in the field of electric power system, can solve problems affecting the application range of smart meters, achieve the effect of increasing the voltage input range and avoiding oscillation phenomenon

Inactive Publication Date: 2016-11-16
HENGYE ELECTRONICS JIAXING CITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In existing smart meters, the LM2904 communication circuit used is used to demodulate the signal output by the TSS721A modulation circuit. However, the maximum input voltage of the LM2904 communication circuit is only 26V, which is relatively narrow, which affects the smart meter. Application range

Method used

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  • Communication circuit for smart electric meter

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Embodiment 1

[0015] The present invention provides a communication circuit for smart meters, the communication circuit is connected to the output end of the TSS721A modulation circuit, and the communication circuit includes:

[0016] LM393 chip 1, first resistor 2, second resistor 3, third resistor 4, fourth resistor 5, first resistor 2 and second resistor 3 are connected in series on the reverse input end of the first channel of LM393 chip 1 One end is connected to the same input end of the first channel of LM393 chip 1, the other end of the second resistor 3 is connected to one end of the third resistor 4, and the other end of the third resistor 4 is grounded, and is connected to the output end of the first channel of LM393 chip 1. A fourth resistor 5 is connected in series;

[0017] In practice, in order to make up for the defects of the LM2904 chip 1 communication circuit, this embodiment provides a communication circuit using the LM393 chip as the main body. demodulation.

[0018] F...

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Abstract

The present invention provides a communication circuit for a smart electric meter, connected to an output end of a TSS721A modulation circuit. The communication circuit comprises an LM393 chip. A first resistor is connected in series to an inverting input end of a first channel of the LM393 chip. One end of a second resistor is connected to a non-inverting input end of the first channel of the LM393 chip, and the other end of the second resistor is connected to one end of a third resistor. The other end of the third resistor is grounded. A fourth resistor is connected in series to an output end of the first channel of the LM393 chip. The voltage input range of the communication circuit is expanded by means of the LM393 chip. Moreover, the phenomenon of oscillation caused by a parasitic resistor is avoided by arranging a resistor at the inverting input end.

Description

technical field [0001] The invention belongs to the field of power systems, in particular to a communication circuit for smart meters. Background technique [0002] At present, due to the characteristics of accurate measurement and convenient communication, smart meters have replaced the old-fashioned energy meters and become mainstream products in the power system. [0003] In existing smart meters, the LM2904 communication circuit used is used to demodulate the signal output by the TSS721A modulation circuit. However, the maximum input voltage of the LM2904 communication circuit is only 26V, which is relatively narrow, which affects the smart meter. application range. Contents of the invention [0004] In order to solve the shortcomings and deficiencies in the prior art, the present invention provides a communication circuit for a smart meter for improving the application range of the smart meter. [0005] In order to achieve the above-mentioned technical purpose, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/40
CPCH04B1/40
Inventor 马巧娟孙林忠傅亮胡萌
Owner HENGYE ELECTRONICS JIAXING CITY
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