CN203595742U - Broadband low current measuring device based on Isolated PCB type Rogowski coil - Google Patents
Broadband low current measuring device based on Isolated PCB type Rogowski coil Download PDFInfo
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- CN203595742U CN203595742U CN201320775888.7U CN201320775888U CN203595742U CN 203595742 U CN203595742 U CN 203595742U CN 201320775888 U CN201320775888 U CN 201320775888U CN 203595742 U CN203595742 U CN 203595742U
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- 238000005259 measurement Methods 0.000 claims abstract description 30
- 238000011084 recovery Methods 0.000 claims description 6
- 230000010354 integration Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000033772 system development Effects 0.000 description 1
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Abstract
The utility model discloses a broadband low current measuring device based on an isolated PCB type Rogowski coil. The broadband low current measuring device includes an isolated PCB type Rogowski coil, an integral circuit, an amplifier circuit and a signal receiving device. The integral circuit is a current mode integral unit implemented by use of a transconductance amplifier. According to the utility model, the broadband low current measuring device can achieve high accuracy low current measurement at working frequency or high frequency, with a measurement bandwidth up to 50 to 20KHz and measurement accuracy up to 0.5A, and the shortcomings of a conventional Rogowski coil in terms of current measurement are eliminated. By using the isolated PCB type Rogowski coil as a sensor head, the broadband low current measuring device has the advantages of being easy to install, light in weight, easy to manufacture and so forth; and the employment of the current mode integral unit implemented by the transconductance amplifier enables effective reduction in errors and an increase in the bandwidth.
Description
Technical field
The utility model belongs to current measurement field, particularly a kind of wideband small current measurement device based on isolated PCB type Luo-coil.
Background technology
Traditional current measuring device mainly adopts with electromagnetic current transducer unshakable in one's determination because of it, and not only volume is large, frequency band is narrow, explosion-proof isolation is difficult, and under large electric current, iron circuit is easily saturated, and measurement result is produced to larger error.Thereby it is difficult to meet the requirement of power system development, must seek to replace it based on the current measuring device of other sensor mechanisms.Rogowski coil (hereinafter to be referred as Luo-coil) current transformer is as the one of electronic current mutual inductor, have that measurement range is wide, measuring accuracy is high, without magnetic saturation, frequency band range is wide, volume is little, be easy to the series of advantages such as digital output.At present, the research based on Luo-coil current transformer has become one of important directions of new century mutual inductor development with application, in electric system, have broad application prospects.
The shortcomings such as it is low that but current existing Luo-coil all exists measuring accuracy, and stability is not high, most Luo-coil measurement mechanism is devoted to large electric current, and the measurement of the little electric current of power frequency of commonly using in distribution has but been ignored in the measurement of high frequency lightning current.Existing to be used for the Luo-coil measurement mechanism that low current measures less, and do not have easy installation, the easy advantage such as making, thereby can not meet the demand in production and construction.
Utility model content
The technical matters that the utility model solves is to provide a kind of wideband small current measurement device based on isolated PCB type Luo-coil.
The technical solution that realizes the utility model object is: a kind of wideband small current measurement device based on PCB Luo-coil, comprise the isolated PCB type Luo-coil, integrating circuit unit, amplifier circuit unit, the sample circuit unit that are connected successively, described isolated PCB type Luo-coil is connected with integrating circuit unit, differentiated voltage signal is transferred to integrating circuit unit, and integrating circuit unit carries out integration to differentiated voltage signal and obtains recovery voltage signal; Integrating circuit unit is connected with amplifier circuit unit, and recovery voltage signal is transferred to amplifier circuit unit, and amplifier circuit unit amplifies the voltage signal after reducing; Amplifier circuit unit is connected with sample circuit unit, samples to the signal after amplifying in sample circuit unit.
Compared with prior art, its remarkable advantage is the utility model: 1) precision of device current measurement of the present utility model is high, and particularly, the in the situation that of power current, measuring accuracy can reach 0.5A; 2) bandwidth of current measurement, its Measurement bandwidth can reach 50～20KHz; 3) use trsanscondutance amplifier realize current-mode integral unit, can effectively reduce the later stage signal process time, to the interference of signal, and high frequency performance is good; 4) device of the present utility model can meet the requirement of current measurement field for precision (the particularly little current precision of power frequency), reliability.
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is the wideband small current measurement principle of device block diagram based on isolated PCB type Luo-coil of the present utility model.
Fig. 2 is the circuit diagram of integrating circuit unit in the wideband small current measurement device based on isolated PCB type Luo-coil of the present utility model.
Embodiment
A kind of wideband small current measurement device based on PCB Luo-coil of the present utility model, comprise the isolated PCB type Luo-coil, integrating circuit unit, amplifier circuit unit, the sample circuit unit that are connected successively, described isolated PCB type Luo-coil is connected with integrating circuit unit, differentiated voltage signal is transferred to integrating circuit unit, and integrating circuit unit carries out integration to differentiated voltage signal and obtains recovery voltage signal; Integrating circuit unit is connected with amplifier circuit unit, and recovery voltage signal is transferred to amplifier circuit unit, and amplifier circuit unit amplifies the voltage signal after reducing; Amplifier circuit unit is connected with sample circuit unit, samples to the integrated signal after amplifying in sample circuit unit.
Described integrating circuit unit comprises the first resistance R 1, the second resistance R 2, capacitor C 1, operational transconductance amplifier U1, operational amplifier U2, Luo-coil output terminal a is connected with the negative pole of operational transconductance amplifier U1, Luo-coil output terminal b is connected with the positive pole of operational transconductance amplifier U1, the positive source of operational transconductance amplifier U1 is connected with power supply Vcc, the power cathode of operational transconductance amplifier U1 is connected with power supply Vdd, the output terminal of operational transconductance amplifier U1 is connected with one end of capacitor C 1, this end is connected with the positive input of operational amplifier U2 simultaneously, the other end of capacitor C 1 is connected with GND, one end of the first resistance R 1 is connected with GND, the other end is connected with one end of the second resistance R 2, be connected with the negative input level of operational amplifier U2 simultaneously, the other end of the second resistance R 2 is connected with the output terminal of operational amplifier U2, the positive pole of operational amplifier U2 is connected with power supply Vcc, the negative pole of operational amplifier U2 is connected with power supply Vdd.
Wherein operational transconductance amplifier U1 adopts CA3080 type high-performance, low-power consumption operational transconductance amplifier.What operational amplifier U2 adopted is LM324N type operational amplifier.
The precision of device current measurement of the present utility model is high, and particularly, the in the situation that of power current, measuring accuracy can reach 0.5A; The bandwidth of current measurement, its Measurement bandwidth can reach 50～20KHz; Use trsanscondutance amplifier realize current-mode integral unit, can effectively reduce the later stage signal process time, to the interference of signal, and high frequency performance is good.The utility model can be realized the measurement of power frequency or the little electric current of high-frequency high-precision, has eliminated the deficiency of conventional Luo-coil aspect such current measurement.The utility model adopts isolated PCB type Luo-coil as sensing head, has the advantages such as easy installation, lightweight, easy making, and the utility model current-mode integral unit of adopting trsanscondutance amplifier to realize, can effectively reduce error, increases bandwidth.
Claims (3)
1. the wideband small current measurement device based on isolated PCB type Luo-coil, it is characterized in that, comprise the isolated PCB type Luo-coil, integrating circuit unit, amplifier circuit unit, the sample circuit unit that are connected successively, described isolated PCB type Luo-coil is connected with integrating circuit unit, differentiated voltage signal is transferred to integrating circuit unit, and integrating circuit unit carries out integration to differentiated voltage signal and obtains recovery voltage signal; Integrating circuit unit is connected with amplifier circuit unit, and recovery voltage signal is transferred to amplifier circuit unit, and amplifier circuit unit amplifies the voltage signal after reducing; Amplifier circuit unit is connected with sample circuit unit, samples to the signal after amplifying in sample circuit unit.
2. the wideband small current measurement device based on isolated PCB type Luo-coil according to claim 1, it is characterized in that, integrating circuit unit comprises the first resistance (R1), the second resistance (R2), electric capacity (C1), operational transconductance amplifier (U1), operational amplifier (U2), Luo-coil output terminal a is connected with the negative pole of operational transconductance amplifier (U1), Luo-coil output terminal b is connected with the positive pole of operational transconductance amplifier (U1), the positive source of operational transconductance amplifier (U1) is connected with power supply Vcc, the power cathode of operational transconductance amplifier (U1) is connected with power supply Vdd, the output terminal of operational transconductance amplifier (U1) is connected with one end of electric capacity (C1), this end is connected with the positive input of operational amplifier (U2) simultaneously, the other end of electric capacity (C1) is connected with GND, one end of the first resistance (R1) is connected with GND, the other end is connected with the one end of the second resistance (R2), be connected with the negative input level of operational amplifier (U2) simultaneously, the other end of the second resistance (R2) is connected with the output terminal of operational amplifier (U2), the positive pole of operational amplifier (U2) is connected with power supply Vcc, the negative pole of operational amplifier (U2) is connected with power supply Vdd.
3. the wideband small current measurement device based on isolated PCB type Luo-coil according to claim 2, is characterized in that, operational transconductance amplifier (U1) is CA3080 type operational transconductance amplifier, and operational amplifier (U2) is LM324N type operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320775888.7U CN203595742U (en) | 2013-11-29 | 2013-11-29 | Broadband low current measuring device based on Isolated PCB type Rogowski coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320775888.7U CN203595742U (en) | 2013-11-29 | 2013-11-29 | Broadband low current measuring device based on Isolated PCB type Rogowski coil |
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| Publication Number | Publication Date |
|---|---|
| CN203595742U true CN203595742U (en) | 2014-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320775888.7U Expired - Fee Related CN203595742U (en) | 2013-11-29 | 2013-11-29 | Broadband low current measuring device based on Isolated PCB type Rogowski coil |
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| CN (1) | CN203595742U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616549A (en) * | 2013-11-29 | 2014-03-05 | 国家电网公司 | Broadband low-current measurement device based on isolated PCB-type Rogowski coil |
| CN104345196A (en) * | 2014-10-30 | 2015-02-11 | 南京信息工程大学 | Active weak power frequency current induction coil |
-
2013
- 2013-11-29 CN CN201320775888.7U patent/CN203595742U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616549A (en) * | 2013-11-29 | 2014-03-05 | 国家电网公司 | Broadband low-current measurement device based on isolated PCB-type Rogowski coil |
| CN104345196A (en) * | 2014-10-30 | 2015-02-11 | 南京信息工程大学 | Active weak power frequency current induction coil |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| 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: 20140514 Termination date: 20181129 |