CN206506517U - A kind of isolating device of d. c. voltage signal sampling - Google Patents
A kind of isolating device of d. c. voltage signal sampling Download PDFInfo
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- CN206506517U CN206506517U CN201720065904.1U CN201720065904U CN206506517U CN 206506517 U CN206506517 U CN 206506517U CN 201720065904 U CN201720065904 U CN 201720065904U CN 206506517 U CN206506517 U CN 206506517U
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- Prior art keywords
- isolation
- operational amplifier
- partial pressure
- voltage
- voltage signal
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Abstract
The utility model belongs to distribution network automated technical field and discloses a kind of isolating device of d. c. voltage signal sampling, including isolation operational amplifier, dc source isolation becomes module and partial pressure precision resistance, it is characterized in that, the isolation operational amplifier, dc source isolation, which becomes between module and partial pressure precision resistance circuit, to be electrically connected to each other, the isolation operational amplifier is used for carrying out voltage isolation with following, and partial pressure is carried out using partial pressure precision resistance in input, power supply becomes module stability output isolated power supply by dc source isolation using system DC5V power supplys and used for isolation operational amplifier.The utility model isolates operational amplifier and dc source isolation becomes module and can bear Gao Da≤1500V isolation voltage, input uses precision resistance energy, can be by configuring the partial pressure precision resistance resistance of input, the demand of the different range abilities of DC0 220V can be met, the initial precision of isolation operational amplifier can reach 0.5%, and 1% precision is reached in 40 DEG C of+70 DEG C of temperature ranges.
Description
Technical field
The utility model is specifically related to a kind of isolating device of d. c. voltage signal sampling, belongs to distribution network automated technology
Field.
Background technology
Distribution network automated terminal is typically also gathered in addition to the voltage, electric current ac analog of collection distribution line
Other many semaphores, such as temperature, storage battery cell voltage.The CPU and direct current AD acquisition systems of distribution network terminal typically can only
Collection is than small voltage signal, such as DC0-3V or DC0-5V, in order to improve the antijamming capability of terminal, it is ensured that terminal operating
Reliability, stability, cpu system and AD Acquisition Circuit with must be with the collected circuit electrical isolation design in outside, and for storing
The direct current collection capacity range such as cell voltage typically has the various conventional grades such as DC12V, DC24V, DC48V.In current practice,
Or this DC quantity acquisition mode does not isolate collection, it is poor to there is the stability of a system, poor anti jamming capability, or using customization
Isolate transmitting module, it is expensive to there is cost, configure the problems such as dumb.
Utility model content
The technical problems to be solved in the utility model overcome existing defect there is provided a kind of d. c. voltage signal sample every
From device, range can configure, precision is high, d. c. voltage signal harvester with isolation, can effectively solve background skill
The problem of in art.
In order to solve the above-mentioned technical problem, the utility model provides following technical scheme：
The utility model provides a kind of isolating device of d. c. voltage signal sampling, including isolation operational amplifier, direct current
Isolated from power becomes module and partial pressure precision resistance, it is characterised in that the isolation operational amplifier, dc source isolation become module
And be electrically connected to each other between partial pressure precision resistance circuit, the isolation operational amplifier is used for carrying out voltage isolation with following, and
Partial pressure is carried out using partial pressure precision resistance in input, power supply becomes mould using system DC5V power supplys by dc source isolation
The stable output isolated power supply of block is used for isolation operational amplifier.
It is preferred that, the isolation operational amplifier is using ADUM3190 models integrated IC, isolation voltage 2500kV peak value electricity
Pressure.
It is preferred that, the dc source isolation becomes module and becomes DC5V modules, power 1W, isolation voltage using DC5V
DC1500V。
It is preferred that, the partial pressure precision resistance uses 10PPM Low Drift Temperature resistance.
It is preferred that, the isolation operational amplifier input voltage range is 0-DC5V.
The beneficial effect that the utility model is reached is：Isolation operational amplifier and dc source isolation, which become module, can hold
By Gao Da≤1500V isolation voltage, input uses precision resistance energy, can be hindered by configuring the partial pressure precision resistance of input
Value, can meet the demand of the different range abilities of DC0-220V, the initial precision of isolation operational amplifier can reach 0.5%, -40
Reached in DEG C -+70 DEG C temperature ranges 1% precision, isolation operational amplifier of the present utility model, dc source isolation become module
And precision resistance is market conventional device, buying is convenient, and cost is low.
Brief description of the drawings
Accompanying drawing is used for providing further understanding to of the present utility model, and constitutes a part for specification, with this practicality
New embodiment is used to explain the utility model together, does not constitute to limitation of the present utility model.
In the accompanying drawings：
Fig. 1 is a kind of isolating device theory diagram of d. c. voltage signal sampling described in the utility model embodiment；
Label in figure：Isolate operational amplifier 1, dc source isolation and become module 2, partial pressure precision resistance 3.
Embodiment
Preferred embodiment of the present utility model is illustrated below in conjunction with accompanying drawing, it will be appreciated that described herein excellent
Select embodiment to be merely to illustrate and explain the utility model, be not used to limit the utility model.
Embodiment：Referring to Fig. 1, a kind of isolating device of d. c. voltage signal sampling of the utility model, including isolation fortune
Calculate amplifier 1, dc source isolation and become module 2 and partial pressure precision resistance 3, the isolation operational amplifier 1, dc source isolation
Become between module 2 and the circuit of partial pressure precision resistance 3 and be electrically connected to each other, the isolation operational amplifier 1 is used for carrying out voltage isolation
Partial pressure is carried out using partial pressure precision resistance 3 with following, and in input, the input voltage range of isolation operational amplifier 1 is
0-DC5V, the partial pressure precision resistance 3 is using 10PPM Low Drift Temperature resistance, and power supply is using system DC5V power supplys by described straight
Stream isolated from power becomes the stable output isolated power supply of module 2 and used for isolation operational amplifier 1, and the dc source isolation becomes module
2 become DC5V modules using DC5V, and power 1W, isolation voltage DC1500V, the isolation operational amplifier 1 uses ADUM3190 types
Number integrated IC, isolation voltage 2500kV crest voltages.
It should be noted that the utility model is the isolating device that a kind of d. c. voltage signal is sampled, during work：According to electricity
Voltage divider principle is hindered, isolates the input voltage of operational amplifier 1：
VINP=Vin*R2/ (R1+R2) formula 1
Sampled input voltage is incorporated to voltage stabilizing ZD15V voltage stabilizing tube protective circuits after the partial pressure of partial pressure precision resistance 3, then defeated
Enter to isolate operational amplifier 1, isolation operational amplifier 1 is configured to follow circuit, and voltage follower is that series voltage negtive backword is put
The special case of big device, feedback voltage is equal to output voltage, output voltage and input voltage same-phase, i.e. VINP=Vout, isolation fortune
The d. c. voltage signal of the last output equivalence of amplifier 1 but isolation is calculated for AD and CPU collections；
The propagation formula of whole device transmission circuit is：
Vout=Vin*R2/ (R1+R2) formula 2
DC//DC power modules provide the DC5V voltage-stabilized power supplies of isolation for operational amplifier, and whole electric loop both ensure that
The isolation of signal, also ensure that the isolation of power supply；
Because VINP voltage of the AD and CPU collection voltages scopes after DC0-3V, partial pressure must be controlled in VINPDC3V,
At this moment the collection for different range abilities need to configure different resistances R1, R2, when such as input voltage vin is in the range of DC60V,
Then partial pressure precision resistance 3 recommends selection 3.6K resistances, R1 selection 125K resistances；
Then drawn according to formula 2：Vout=Vin*3.6k ohm/(3.6k ohm+125k ohm)
I.e.：Vout=0.0280Vin formula 3
General configuration R1+R2 resistances are more than 10k ohm.
Finally it should be noted that：Preferred embodiment of the present utility model is the foregoing is only, this is not limited to
Utility model, although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art
For, it can still modify to the technical scheme described in foregoing embodiments, or to which part technical characteristic
Carry out equivalent substitution.It is all it is of the present utility model spirit and principle within, any modification, equivalent substitution and improvements made etc.,
It should be included within protection domain of the present utility model.
Claims (5)
1. a kind of isolating device of d. c. voltage signal sampling, including the isolation of isolation operational amplifier (1), dc source become module
And partial pressure precision resistance (3) (2), it is characterised in that the isolation operational amplifier (1), dc source isolation become module (2) and
Be electrically connected to each other between partial pressure precision resistance (3) circuit, it is described isolation operational amplifier (1) be used for carry out voltage isolation with
With, and partial pressure is carried out using partial pressure precision resistance (3) in input, power supply passes through the dc source using system DC5V power supplys
Isolation becomes the stable output isolated power supply of module (2) and used for isolation operational amplifier (1).
2. a kind of isolating device of d. c. voltage signal sampling according to claim 1, it is characterised in that the isolation fortune
Calculate amplifier (1) and use the integrated IC of ADUM3190 models, isolation voltage 2500kV crest voltages.
3. a kind of isolating device of d. c. voltage signal sampling according to claim 1, it is characterised in that the direct current
Source isolation becomes module (2) and becomes DC5V modules, power 1W, isolation voltage DC1500V using DC5V.
4. a kind of isolating device of d. c. voltage signal sampling according to claim 1, it is characterised in that the partial pressure essence
Cipher telegram resistance (3) uses 10PPM Low Drift Temperature resistance.
5. a kind of isolating device of d. c. voltage signal sampling according to claim 1, it is characterised in that the isolation fortune
Calculation amplifier (1) input voltage range is 0-DC5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720065904.1U CN206506517U (en) | 2017-01-18 | 2017-01-18 | A kind of isolating device of d. c. voltage signal sampling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720065904.1U CN206506517U (en) | 2017-01-18 | 2017-01-18 | A kind of isolating device of d. c. voltage signal sampling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206506517U true CN206506517U (en) | 2017-09-19 |
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ID=59839550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720065904.1U Expired - Fee Related CN206506517U (en) | 2017-01-18 | 2017-01-18 | A kind of isolating device of d. c. voltage signal sampling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206506517U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542787A (en) * | 2019-07-22 | 2019-12-06 | 北京中航智科技有限公司 | voltage acquisition device for DC bus of three-level motor driver |
| CN111721995A (en) * | 2020-06-23 | 2020-09-29 | 南京海兴电网技术有限公司 | Isolation sampling circuit of direct current voltage signal |
-
2017
- 2017-01-18 CN CN201720065904.1U patent/CN206506517U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542787A (en) * | 2019-07-22 | 2019-12-06 | 北京中航智科技有限公司 | voltage acquisition device for DC bus of three-level motor driver |
| CN111721995A (en) * | 2020-06-23 | 2020-09-29 | 南京海兴电网技术有限公司 | Isolation sampling circuit of direct current voltage signal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170919 Termination date: 20200118 |