CN203761360U - Electric energy meter RS485 input end protection circuit - Google Patents

Electric energy meter RS485 input end protection circuit Download PDF

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Publication number
CN203761360U
CN203761360U CN201320775570.9U CN201320775570U CN203761360U CN 203761360 U CN203761360 U CN 203761360U CN 201320775570 U CN201320775570 U CN 201320775570U CN 203761360 U CN203761360 U CN 203761360U
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CN
China
Prior art keywords
communication chip
electric energy
energy meter
input
protection circuit
Prior art date
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Active
Application number
CN201320775570.9U
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Chinese (zh)
Inventor
刘俊
崔永峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningbo Sanxing Medical and Electric Co Ltd
Original Assignee
Ningbo Sanxing Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to CN201320775570.9U priority Critical patent/CN203761360U/en
Application granted granted Critical
Publication of CN203761360U publication Critical patent/CN203761360U/en
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Abstract

The utility model discloses an electric energy meter RS485 input end protection circuit including an RS485 communication chip. A VDD pin of the RS485 communication chip is connected with a power supply VDD; a GND pin of the RS485 communication chip is connected with a common grounding end GND; the electric energy meter RS485 input end protection circuit also comprises a protection circuit which can protect the RS485 communication chip against signal interference; and the protection circuit is connected with the RS485 communication chip. The electric energy meter RS485 input end protection circuit ensures that the RS485 chip is free of the interface failure caused by the misoperation and malicious attack in the network communication.

Description

Electric energy meter RS485 input protective circuit
Technical field
The utility model relates to electric energy meter technical field, specifically a kind of electric energy meter RS485 input protective circuit.
Background technology
Current electric energy meter on the market can configure multiple communication interface, and wherein RS485 interface is the main means of communication of electric energy meter field data acquisition.Because the input interface end of prior art electric energy meter RS485 chip is exposed; therefore the interface fails that the RS485 chip that lacks protection is easy to be subject to misoperation in group-net communication and people to cause for malicious attack, thus the acquisition rate of RS485 chip real time data affected.Therefore, for these reasons, urgently need a kind of electric energy meter RS485 input protective circuit, this circuit can ensure that RS485 chip is not subject to the interference of external signal, to address the above problem.
Utility model content
The technical problems to be solved in the utility model is; overcome the defect of above prior art; a kind of electric energy meter RS485 input protective circuit is provided, and this circuit can ensure the interface fails that RS485 chip is not caused for malicious attack by misoperation in group-net communication and people.
The technical solution of the utility model is, a kind of electric energy meter RS485 input protective circuit is provided, and comprises RS485 communication chip, and the VDD pin of described RS485 communication chip is connected with power vd D, and the GND pin of described RS485 communication chip is connected with common ground end GND; Described electric energy meter RS485 input protective circuit also comprises that one can ensure the protective circuit that RS485 communication chip is not disturbed by signal, and described protective circuit is connected with card RS485 communication chip.
Described protective circuit comprises resistance R 1, R2, thermistor RT1, RT2, two-way TVS pipe VD1 and two-way TVS pipe VD2, one end of described resistance R 1 is connected with the VDD pin of RS485 communication chip, and the other end of described resistance R 1 is connected with the A pin of RS485 communication chip, one end of two-way TVS pipe VD1, one end of thermistor RT1; One end of described resistance R 2 is connected with the GND pin of RS485 communication chip, and the other end of described resistance R 2 is connected with the B pin of RS485 communication chip, one end of two-way TVS pipe VD2, one end of thermistor RT2; The other end of described two-way TVS pipe VD1, the other end of two-way TVS pipe VD2 are all connected with common ground end.
Adopt after above structure, the utility model compared with prior art, has the following advantages:
The utility model electric energy meter RS485 input protective circuit is because the input interface end of RS485 chip has access to protective circuit; therefore effectively prevent the interface fails that the misoperation of RS485 interface circuit in group-net communication and people cause for malicious attack, thereby improved the reliability of data acquisition.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of the utility model electric energy meter RS485 input protective circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 1, a kind of electric energy meter RS485 of the utility model input protective circuit, comprises RS485 communication chip, and the VDD pin of described RS485 communication chip is connected with power vd D, and the GND pin of described RS485 communication chip is connected with common ground end GND; Described electric energy meter RS485 input protective circuit also comprises that one can ensure the protective circuit that RS485 communication chip is not disturbed by signal, and described protective circuit is connected with card RS485 communication chip.
Described protective circuit comprises resistance R 1, R2, thermistor RT1, RT2, two-way TVS pipe VD1 and two-way TVS pipe VD2, one end of described resistance R 1 is connected with the VDD pin of RS485 communication chip, and the other end of described resistance R 1 is connected with the A pin of RS485 communication chip, one end of two-way TVS pipe VD1, one end of thermistor RT1; One end of described resistance R 2 is connected with the GND pin of RS485 communication chip, and the other end of described resistance R 2 is connected with the B pin of RS485 communication chip, one end of two-way TVS pipe VD2, one end of thermistor RT2; The other end of described two-way TVS pipe VD1, the other end of two-way TVS pipe VD2 are all connected with common ground end.
Below be only described with regard to most preferred embodiment of the present utility model, but can not be interpreted as it is limitations on claims.The utility model is not limited only to above embodiment, and its concrete structure allows to change.In every case the various variations of doing in the protection range of the utility model independent claims are all in protection range of the present utility model.

Claims (2)

1. an electric energy meter RS485 input protective circuit, comprises RS485 communication chip, and the VDD pin of described RS485 communication chip is connected with power vd D, and the GND pin of described RS485 communication chip is connected with common ground end GND; It is characterized in that: described electric energy meter RS485 input protective circuit also comprises that one can ensure the protective circuit that RS485 communication chip is not disturbed by signal, and described protective circuit is connected with RS485 communication chip.
2. electric energy meter RS485 input protective circuit according to claim 1, it is characterized in that: described protective circuit comprises resistance R 1, R2, thermistor RT1, RT2, two-way TVS pipe VD1 and two-way TVS pipe VD2, one end of described resistance R 1 is connected with the VDD pin of RS485 communication chip, and the other end of described resistance R 1 is connected with the A pin of RS485 communication chip, one end of two-way TVS pipe VD1, one end of thermistor RT1; One end of described resistance R 2 is connected with the GND pin of RS485 communication chip, and the other end of described resistance R 2 is connected with the B pin of RS485 communication chip, one end of two-way TVS pipe VD2, one end of thermistor RT2; The other end of described two-way TVS pipe VD1, the other end of two-way TVS pipe VD2 are all connected with common ground end.
CN201320775570.9U 2013-11-29 2013-11-29 Electric energy meter RS485 input end protection circuit Active CN203761360U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320775570.9U CN203761360U (en) 2013-11-29 2013-11-29 Electric energy meter RS485 input end protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320775570.9U CN203761360U (en) 2013-11-29 2013-11-29 Electric energy meter RS485 input end protection circuit

Publications (1)

Publication Number Publication Date
CN203761360U true CN203761360U (en) 2014-08-06

Family

ID=51256590

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201320775570.9U Active CN203761360U (en) 2013-11-29 2013-11-29 Electric energy meter RS485 input end protection circuit

Country Status (1)

Country Link
CN (1) CN203761360U (en)

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Legal Events

Date Code Title Description
GR01 Patent grant
C14 Grant of patent or utility model
CP03 Change of name, title or address

Address after: 315191 Yinzhou Industrial Park, Zhejiang, Ningbo, Yinzhou District, Ningbo

Patentee after: NINGBO SANXING MEDICAL ELECTRIC CO., LTD.

Address before: 315131, AUX Industrial Park, Mingguang North Road, Jiangshan Town, Ningbo, Yinzhou District, Zhejiang 1166, China

Patentee before: Ningbo Sanxing Electric Co., Ltd.

C56 Change in the name or address of the patentee