CN201689123U - Direct current analog quantity acquisition isolation converting circuit - Google Patents
Direct current analog quantity acquisition isolation converting circuit Download PDFInfo
- Publication number
- CN201689123U CN201689123U CN2010201752243U CN201020175224U CN201689123U CN 201689123 U CN201689123 U CN 201689123U CN 2010201752243 U CN2010201752243 U CN 2010201752243U CN 201020175224 U CN201020175224 U CN 201020175224U CN 201689123 U CN201689123 U CN 201689123U
- Authority
- CN
- China
- Prior art keywords
- mcu
- output
- circuit
- coupling transformer
- isolation
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Analogue/Digital Conversion (AREA)
Abstract
The utility model relates to a direct current analog quantity acquisition circuit of current, in particular to a direct current analog quantity acquisition isolation converting circuit which comprises an I/V convertor, two MCUs, an isolation coupling transformer, a driver, an amplifier, a filter and a reshaper. The input terminal of the I/V convertor is connected with current signals; the input terminal of the driver is connected with a PWM output port of the second MCU; the output terminal of the driver is connected with the input terminal of the isolation coupling transformer; the output terminal of the isolation coupling transformer is connected with a capture port of the first MCU through the amplifier, the filter and the reshaper; and practical current value is output by the first MCU. The circuit adopts one isolation coupling transformer to realize the isolation and conversion to the circuit, adopts another MCU to process the current signals, effectively realizes the isolation to the circuit and improves the precision of the circuit.
Description
Technical field
The utility model relates to a kind of DC analogue quantity Acquisition Circuit of electric current, and a kind of specifically DC analogue quantity is gathered the isolated variable circuit.
Background technology
The DC analogue quantity Acquisition Circuit to a kind of 4-20mA electric current commonly used in power information acquisition terminal functional requirement, the DC analogue quantity Acquisition Circuit generally is made up of an I/V converter and a slice MCU in the prior art, and current signal directly advances the MCU digital to analog conversion and obtains current value after the I/V conversion.Though available circuit is simple, with the non-isolation electric of other light current terminal, introducing when EMC disturbs in the external world to influence terminal other parts performance, in the time of seriously even can damage terminal.So existing DC analogue quantity Acquisition Circuit must be isolated, DC analogue quantity adopts the most direct method of isolated variable to adopt the optocoupler conversion exactly, but general optocoupler poor linearity, isolation voltage are lower, are difficult to accomplish high-precision requirement.
Summary of the invention
Technical problem to be solved in the utility model is: at the shortcoming that above prior art exists, proposes a kind of DC analogue quantity and gathers the isolated variable circuit, can effectively isolate, and the road precision height that conducts electricity, anti-interference effective.
The technical scheme that the utility model solves above technical matters is:
DC analogue quantity is gathered the isolated variable circuit, a MCU who includes filtering and sampling who comprises an I/V converter and a slice, the input of I/V converter connects current signal, comprises that also isolation coupling transformer, an a slice include the 2nd MCU, a driver, an amplifier, a wave filter and a reshaper of AD conversion and PWM output; The output of I/V converter connects the AD interface of the 2nd MCU, the input of driver connects the PWM output port of the 2nd MCU, the output of driver connects the input of isolation coupling transformer, the output of isolation coupling transformer connects the seizure port of a MCU behind amplifier, wave filter and reshaper, by MCU output actual current value.
Like this, the input measurement electric current is by after the I/V conversion, again current signal is transformed into pwm signal by built-in AD conversion of MCU and digitized processing thereof, utilize the PWM can be by the principle of isolating transformer coupling, pwm signal after isolating is calculated to be the high-precision current value by another MCU processing again, owing to use the isolation coupling transformer, than traditional analog I/F circuit precision height, anti-interference effective, and cost is low.
This shows that the utility model uses an isolation coupling transformer that available circuit has been carried out isolated variable, uses another sheet MCU that current signal is handled, effectively realized the isolation of circuit and improved the precision of circuit.
As the technical scheme that the utility model further limits, two MCU are the PIC12F615 chips that Microchip company produces, and include 10 AD conversion and 10 bit resolution PWM output, make it constitute the higher isolated variable circuit of precision at this circuit.
Drive and adopt 9013/9012 triode, adopt push pull mode to drive.
Two-way JFET input operational amplifier is adopted in amplification, filtering and shaping, and wherein half is as band-pass filter amplifier, and second half is as limiting amplifier.
Description of drawings
Fig. 1 is a circuit diagram of the present utility model.
Embodiment
Embodiment one
Present embodiment is that a kind of DC analogue quantity is gathered the isolated variable circuit, and its circuit diagram comprises an I/V converter, two MCU, an isolation coupling transformer, a driver, an amplifier, a wave filter and a reshaper as shown in Figure 1.Two MCU use the PIC12F615 chip of low-cost 8 the RISC frameworks of 8 pins of Mi crochip company product, include 10 AD conversion and 10 bit resolution PWM output.Drive and adopt 9013/9012 triode, adopt push pull mode to drive.Two-way JFET input operational amplifier is adopted in amplification, filtering and shaping, and wherein half is as band-pass filter amplifier, and second half is as limiting amplifier.
The output of I/V converter connects the AD interface of PIC12F615 chip, the input of driver connects the PWM output port of PIC12F615 chip, the output of driver connects the input of isolation coupling transformer, the output of isolation coupling transformer connects the seizure port of PIC12F615 chip behind amplifier, wave filter and reshaper, by PIC12F615 chip output actual current value, the PIC12F615 chip is crossed simulation SPI interface and mutual this sampled value of application layer.
The input measurement electric current is sent into MCU after by the I/V conversion and is carried out the AD sampling, the numerical value that obtains produces the High-Accuracy PWM signal through the inner filtering of MCU and after calculating at the PWM end, connect the isolation coupling transformer by driver again, be coupled to secondary side and finish the number conversion of electric current/frequency, the pwm signal that is coupled to secondary side by primary side is by amplifying, send into the seizure port of another MCU after filtering and the shaping, by MCU the signal of sending into is carried out filtering and sampling once more, finally converse actual current value, simultaneously by simulation SPI interface and mutual this sampled value of application layer by internal arithmetic.This circuit cost is cheap, precision is high (10bit), the high anti-various interference effects of isolation voltage are outstanding.
The utility model can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the claimed scope of the utility model.
Claims (4)
1. DC analogue quantity is gathered the isolated variable circuit, a MCU who includes filtering and sampling who comprises an I/V converter and a slice, the input of described I/V converter connects current signal, it is characterized in that: comprise that also isolation coupling transformer, an a slice include the 2nd MCU, a driver, an amplifier, a wave filter and a reshaper of AD conversion and PWM output; The output of described I/V converter connects the AD interface of the 2nd MCU, the input of described driver connects the PWM output port of the 2nd MCU, the output of described driver connects the input of isolation coupling transformer, the output of described isolation coupling transformer connects the seizure port of a MCU behind amplifier, wave filter and reshaper, by MCU output actual current value.
2. DC analogue quantity as claimed in claim 1 is gathered the isolated variable circuit, it is characterized in that: described two MCU are the PIC12F615 chips that Microchip company produces, and include 10 AD conversion and 10 bit resolution PWM output.
3. DC analogue quantity as claimed in claim 1 is gathered the isolated variable circuit, and it is characterized in that: described driver is that model is 9013/9012 triode.
4. DC analogue quantity as claimed in claim 1 is gathered the isolated variable circuit, it is characterized in that: amplifier, wave filter and reshaper adopt two-way JFET input operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201752243U CN201689123U (en) | 2010-04-29 | 2010-04-29 | Direct current analog quantity acquisition isolation converting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201752243U CN201689123U (en) | 2010-04-29 | 2010-04-29 | Direct current analog quantity acquisition isolation converting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201689123U true CN201689123U (en) | 2010-12-29 |
Family
ID=43377403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201752243U Expired - Fee Related CN201689123U (en) | 2010-04-29 | 2010-04-29 | Direct current analog quantity acquisition isolation converting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201689123U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103116054A (en) * | 2013-01-25 | 2013-05-22 | 天津市松正电动汽车技术股份有限公司 | Isolation voltage acquisition circuit |
| CN105759675A (en) * | 2014-12-19 | 2016-07-13 | 中车大连电力牵引研发中心有限公司 | Analog quantity input board card and analog quantity acquisition method |
-
2010
- 2010-04-29 CN CN2010201752243U patent/CN201689123U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103116054A (en) * | 2013-01-25 | 2013-05-22 | 天津市松正电动汽车技术股份有限公司 | Isolation voltage acquisition circuit |
| CN105759675A (en) * | 2014-12-19 | 2016-07-13 | 中车大连电力牵引研发中心有限公司 | Analog quantity input board card and analog quantity acquisition method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202486199U (en) | Data acquisition unit of electronic type mutual inductor | |
| CN102192765A (en) | Multi-channel parallel isolation analog/digital (A/D) acquisition and processing method | |
| CN110702974B (en) | High-reliability current sampling circuit of alternating current servo motor | |
| CN201689123U (en) | Direct current analog quantity acquisition isolation converting circuit | |
| CN201589806U (en) | Direct current isolation sampling device | |
| CN205176570U (en) | Mixed IO data acquisition module of RJ -45 ethernet interface | |
| CN103528492A (en) | Signal converter of high-measurement-range submicron-level high-precision LVDT (linear variable differential transformer) displacement sensor | |
| CN206930700U (en) | A kind of input voltage signal sample circuit in three-phase three-wire system pfc circuit | |
| CN110850761B (en) | High-precision analog quantity acquisition circuit | |
| CN203812008U (en) | Analog signal collector | |
| CN102551881B (en) | Output power monitoring circuit of high frequency electrotome | |
| CN202586931U (en) | Locomotive auxiliary control unit sampling processing circuit | |
| CN202837390U (en) | Power factor detection circuit | |
| CN201656952U (en) | Sampling isolation circuit for analog signal | |
| CN203688649U (en) | Industrial three-phase isolation ammeter | |
| CN217088141U (en) | Converter for realizing stereo asynchronous sampling based on FPGA | |
| CN202033640U (en) | Multi-phase electric energy parameter synchronizing acquisition circuit | |
| CN103487631B (en) | Modulation-demodulation type current sensor | |
| CN203179278U (en) | Sensor signal acquisition module based on optical fiber communication technology | |
| CN201541115U (en) | Intelligent controller with voltage protection module | |
| CN201535797U (en) | Isolation detection circuit for main loop current of induction cooker | |
| CN201583826U (en) | ASI analog quantity acquisition module | |
| CN106357502A (en) | Multi-channel collecting and editing transmitting system | |
| CN104655917A (en) | Railway three-phase signal power supply voltage/current acquisition circuit | |
| CN203705058U (en) | Temperature signal acquisition device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101229 Termination date: 20180429 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |