CN205847255U - Telecommunication circuit for intelligent electric meter - Google Patents
Telecommunication circuit for intelligent electric meter Download PDFInfo
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- CN205847255U CN205847255U CN201620862757.6U CN201620862757U CN205847255U CN 205847255 U CN205847255 U CN 205847255U CN 201620862757 U CN201620862757 U CN 201620862757U CN 205847255 U CN205847255 U CN 205847255U
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Abstract
This utility model provides the telecommunication circuit for intelligent electric meter, it is connected to the outfan of TSS721A modulation circuit, this telecommunication circuit includes LM393 chip, the first passage reverse input end of LM393 is serially connected with the first resistance, one end of second resistance is connected to the first passage input in the same direction of LM393, the other end of the second resistance and one end of the 3rd resistance are connected, and the other end ground connection of the 3rd resistance is serially connected with the 4th resistance on the first passage outfan of LM393；By using LM393 chip to improve the input voltage range of telecommunication circuit, and by arranging resistance at reverse input end, it is to avoid the oscillatory occurences that dead resistance causes.
Description
Technical field
This utility model belongs to field of power, particularly to the telecommunication circuit for intelligent electric meter.
Background technology
Currently, owing to having, metering is accurate, communicate convenient characteristic, and intelligent electric meter instead of old-fashioned electric energy meter,
Become the main product in power system.
In existing intelligent electric meter, the LM2904 telecommunication circuit of use is for the letter to the output of TSS721A modulation circuit
Number it is demodulated, but, the maximum input voltage of LM2904 telecommunication circuit is only 26V, the narrowest, have impact on Intelligent electric
The range of application of table.
Utility model content
In order to solve shortcoming and defect present in prior art, this utility model provide for improve intelligent electric meter should
By the telecommunication circuit for intelligent electric meter of scope.
In order to reach above-mentioned technical purpose, the telecommunication circuit for intelligent electric meter that this utility model provides, telecommunication circuit
Being connected to the outfan of TSS721A modulation circuit, described telecommunication circuit includes: LM393 chip, the first resistance, the second resistance,
Three resistance, the 4th resistance, be serially connected with the first resistance, the one of the second resistance on the first passage reverse input end of LM393 chip
End is connected to the first passage input in the same direction of LM393 chip, the other end of the second resistance and one end of the 3rd resistance and is connected, the
The other end ground connection of three resistance, is serially connected with the 4th resistance on the first passage outfan of LM393 chip.
Optionally, the resistance of described first resistance is less than 10K Ω, and the resistance of described second resistance is less than 10K Ω.
Optionally, the resistance of described 4th resistance is 10K Ω.
Optionally, the first passage reverse input end of described LM393 chip is also serially connected with diode.
The technical scheme that this utility model provides has the benefit that
By using LM393 chip to improve the input voltage range of telecommunication circuit, and by setting at reverse input end
Put resistance, it is to avoid the oscillatory occurences that dead resistance causes.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical solution of the utility model, required use in embodiment being described below
Accompanying drawing is briefly described, it should be apparent that, the accompanying drawing in describing below is only embodiments more of the present utility model, for
From the point of view of those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing.
Fig. 1 is the structural representation of the telecommunication circuit for intelligent electric meter that this utility model provides.
Detailed description of the invention
For making structure of the present utility model and advantage clearer, below in conjunction with accompanying drawing, structure of the present utility model is made
It is further described through.
Embodiment one
This utility model provides the telecommunication circuit for intelligent electric meter, and telecommunication circuit is connected to TSS721A modulation circuit
Outfan, described telecommunication circuit includes:
LM393 chip the 1, first resistance the 2, second resistance the 3, the 3rd resistance the 4, the 4th resistance 5, at the first of LM393 chip 1
Being serially connected with the first resistance 2 on passage reverse input end, one end of the second resistance 3 is connected to the first passage of LM393 chip 1 in the same direction
Input, the other end of the second resistance 3 and one end of the 3rd resistance 4 are connected, and the other end ground connection of the 3rd resistance 4, at LM393 core
It is serially connected with the 4th resistance 5 on the first passage outfan of sheet 1；
In force, in order to make up the defect of LM2904 chip 1 telecommunication circuit, present embodiments provide use LM393 core
Sheet is connected to the outfan of TSS721A modulation circuit as the telecommunication circuit of main body, this telecommunication circuit, for adjusting TSS721A
The signal of circuit processed output is demodulated.
For LM393 chip 1, if be in single supply circuit, supply voltage is in the range of+2V～+36V, if place
In two-supply circuit, supply voltage is in the range of ± 1V～± 18V, and input current should be less than 50mA.
Owing to LM393 chip 1 is high-gain, wide frequency band device, it is therefore desirable to the upper addition of positive feeder ear (VCC) at chip
Shunt capacitance, filters in part clutter and noise, such as figure in 1 and is connected to the electricity on LM393 chip 1 first passage outfan
Hold 6.But, if this device has parasitic capacitance between outfan to input and produces coupling, then can cause unnecessary shaking
Swinging phenomenon, oscillatory occurences especially appears in the gap that comparator state changes, output voltage is excessive.This phenomenon cannot only be leaned on
Shunt capacitance solves, therefore input resistance is reduced to below 10k, is allowed to conversion rates and accelerates, thus gets rid of parasitic capacitance problems,
Here input resistance is to be serially connected with the first resistance 2 on the first passage reverse input end of LM393, one end of the second resistance 3
Being connected to the first passage input in the same direction of LM393, the resistance of the first resistance 2 is less than 10K Ω, and the resistance of the second resistance 3 is less than
10KΩ。
Owing to the output part of LM393 chip 1 is open collector, the npn output transistor of grounded emitter, therefore need
"or" ORing (redundancy backup) function is provided with multicollector output.Output load resistance can be engaged on and can allow power supply electricity
On any supply voltage in the range of pressure, do not limited by VCC terminal voltage value.Here output load resistance such as in Fig. 1
Shown in four resistance 5, the resistance of the 4th resistance 5 is 10K Ω.
Further, it is additionally provided with the 3rd resistance 4, the 3rd resistance 4 ground connection, the 3rd resistance 4 here at the second resistance 3 end
In addition to the effect of releasing, also effectively increase the value of the CMMR (common mode rejection ratio) of circuit, make signal relatively reliable.But the
The resistance of three resistance 4 can not infinitely be amplified, and along with the change of this resistance is big, can affect the center of biasing.
Optionally, the first passage reverse input end of described LM393 is also serially connected with diode 7.
In force, the diode 7 being connected on the first passage reverse input end of LM393 is for filtering LM393 common mode
The frequency signal of negative voltage part in input voltage, provides the bias voltage of 0.3V simultaneously for LM393.
This utility model provides the telecommunication circuit for intelligent electric meter, is connected to the outfan of TSS721A modulation circuit,
This telecommunication circuit includes: LM393 chip, is serially connected with the first resistance, the second resistance on the first passage reverse input end of LM393
One end be connected to the first passage input in the same direction of LM393, the other end of the second resistance and one end of the 3rd resistance and be connected, the
The other end ground connection of three resistance, is serially connected with the 4th resistance on the first passage outfan of LM393；By using LM393 chip
Improve the input voltage range of telecommunication circuit, and by arranging resistance at reverse input end, it is to avoid dead resistance causes
Oscillatory occurences.
Each sequence number in above-described embodiment just to describe, do not represent each parts assemble or use during elder generation
Rear order.
The foregoing is only embodiment of the present utility model, not in order to limit this utility model, all at this utility model
Spirit and principle within, any modification, equivalent substitution and improvement etc. made, should be included in protection model of the present utility model
Within enclosing.
Claims (4)
1., for the telecommunication circuit of intelligent electric meter, telecommunication circuit is connected to the outfan of TSS721A modulation circuit, and its feature exists
In, described telecommunication circuit includes: LM393 chip, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, at LM393 chip
First passage reverse input end on be serially connected with the first resistance, one end of the second resistance is connected to the first passage of LM393 chip
Input in the same direction, the other end of the second resistance and one end of the 3rd resistance are connected, and the other end ground connection of the 3rd resistance, at LM393
It is serially connected with the 4th resistance on the first passage outfan of chip.
Telecommunication circuit for intelligent electric meter the most according to claim 1, it is characterised in that the resistance of described first resistance
Less than 10K Ω, the resistance of described second resistance is less than 10K Ω.
Telecommunication circuit for intelligent electric meter the most according to claim 1, it is characterised in that the resistance of described 4th resistance
For 10K Ω.
4. according to the telecommunication circuit for intelligent electric meter described in any one of claims 1 to 3, it is characterised in that described
Diode also it is serially connected with on the first passage reverse input end of LM393 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620862757.6U CN205847255U (en) | 2016-08-10 | 2016-08-10 | Telecommunication circuit for intelligent electric meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620862757.6U CN205847255U (en) | 2016-08-10 | 2016-08-10 | Telecommunication circuit for intelligent electric meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205847255U true CN205847255U (en) | 2016-12-28 |
Family
ID=57617792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620862757.6U Active CN205847255U (en) | 2016-08-10 | 2016-08-10 | Telecommunication circuit for intelligent electric meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205847255U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130596A (en) * | 2016-08-10 | 2016-11-16 | 浙江恒业电子有限公司 | Telecommunication circuit for intelligent electric meter |
-
2016
- 2016-08-10 CN CN201620862757.6U patent/CN205847255U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130596A (en) * | 2016-08-10 | 2016-11-16 | 浙江恒业电子有限公司 | Telecommunication circuit for intelligent electric meter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No. 1818, Xingping 1st Road, Pinghu Economic Development Zone, Jiaxing City, Zhejiang Province, 314200 Patentee after: Zhejiang Hengye Electronics Co.,Ltd. Address before: No. 1818, Xingping 1st Road, Pinghu Economic Development Zone, Jiaxing City, Zhejiang Province, 314200 Patentee before: ZHEJIANG HENGYE ELECTRONIC Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |