CN110376420A - Single-phase alternating current high-precision quick detection circuit based on mutual inductor - Google Patents
Single-phase alternating current high-precision quick detection circuit based on mutual inductor Download PDFInfo
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- CN110376420A CN110376420A CN201910753621.XA CN201910753621A CN110376420A CN 110376420 A CN110376420 A CN 110376420A CN 201910753621 A CN201910753621 A CN 201910753621A CN 110376420 A CN110376420 A CN 110376420A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
Abstract
The invention belongs to industrial measurement and control fields, are related to a kind of single-phase alternating current high-precision quick detection circuit based on mutual inductor, suitable for all kinds of applications for needing to carry out single-phase alternating current virtual value high-precision real-time monitoring and control.Circuit of the present invention includes current transformer CS1, RMS/DC conversion chip IC1, amplifier IC2, transient state inhibition pipe TV1, potentiometer RP1, I/V resistance R1, input filter resistance R2, output filter resistance R3, negative terminal resistance R4, feedback resistance R5, input filter capacitor C1, capacitance C2, translation filtering capacitor C3, output filter capacitor C4, power capacitor C5 etc..The circuit is made of single-phase current transformer, RMS/DC conversion chip and operational amplifier etc., can high-precision, wide scope, in real time the detection effective value signal of single-phase alternating current.The circuit is simple, at low cost, high reliablity, versatility are good, is easy to commercialization.
Description
Technical field
The invention belongs to industrial measurement and control fields, are related to a kind of circuit, in particular to a kind of single phase ac based on mutual inductor
Electric current high-precision quick detection circuit, suitable for it is all kinds of need to single-phase alternating current virtual value carry out high-precision real-time monitoring with
The application of control.
Background technique
In the types of applications system using single-phase alternating current power supply, detection alternating current virtual value is required, often at present
Single-phase alternating current RMS to DC scheme mainly has two major classes: one is be based on single-phase current transformer and diode bridge
The scheme of formula current rectifying and wave filtering circuit exports the voltage signal that single-phase alternating current is transformed into approximate DC；Another kind is to be based on
The scheme of Hall current sensor.But the following problems exist respectively for the two current schemes: first is that being based on single-phase current transformer
And the scheme of diode bridge rectifying and wave-filtering, although simple and reliable, since diode bridge rectifier circuit has droop loss, no
There is only the non-linear of detection and detection accuracy is influenced, also limits detection range, in addition, the hysteresis quality of detection is big.Second is that
Scheme based on Hall current sensor is limited its scope of application due to expensive.Therefore, one kind how is designed to be based on
Single-phase current transformer and be able to achieve the single-phase alternating current RMS to DC circuit side of high performance-price ratio that high-precision quickly detects
Case undoubtedly has a good application prospect, this is also starting point of the invention.
Summary of the invention
The purpose of the present invention is in view of the deficienciess of the prior art, proposing a kind of single-phase alternating current based on mutual inductor
High-precision quick detection circuit.The circuit is made of single-phase current transformer, RMS/DC conversion chip and operational amplifier etc., energy
In high precision, wide scope, in real time the detection effective value signal of single-phase alternating current.
Single-phase alternating current high-precision quick detection circuit based on mutual inductor includes that current transformer CS1, RMS/DC turn
It changes chip IC 1, amplifier IC2, transient state and inhibits pipe TV1, potentiometer RP1, I/V resistance R1, input filter resistance R2, output filtered electrical
Hinder R3, negative terminal resistance R4, feedback resistance R5, input filter capacitor C1, capacitance C2, translation filtering capacitor C3, output filtering
Capacitor C4, power capacitor C5, tested current carrying conductor pass through current transformer CS1 detection hole, one of current transformer CS1
The end output end OUT1 inhibits one end of one end of pipe TV1, one end of I/V resistance R1, input filter resistance R2 to connect with transient state, defeated
The end positive input terminal IN+ for entering the other end of filter resistance R2 and one end of input filter capacitor C1, RMS/DC conversion chip IC1 connects
Connect, the end another output OUT2 of current transformer CS1, transient state inhibit the other end of pipe TV1, I/V resistance R1 the other end,
The other end of input filter capacitor C1, one end of capacitance C2 are grounded, and the other end and RMS/DC of capacitance C2 is converted
The end negative input end IN- of chip IC 1 connects, the end positive output end OUT+ of RMS/DC conversion chip IC1 and output filter resistance R3
One end, translation filtering capacitor C3 one end connection, enable end/end EN of RMS/DC conversion chip IC1, the end negative power end-V,
The end ground terminal GND, the end negative output terminal OUT- are grounded, the end positive power source terminal+V of RMS/DC conversion chip IC1 and the positive electricity of amplifier IC2
The end source+V, one end of power capacitor C5, the connection of the circuit power end end+VCC, the other end and output for exporting filter resistance R3 are filtered
The end the positive input terminal IN+ connection of one end, amplifier IC2 of wave capacitor C4, the end negative input end IN- of amplifier IC2 and negative terminal resistance R4
One end, feedback resistance R5 one end connection, the other end of negative terminal resistance R4, the other end of output filter capacitor C4, conversion filter
The other end of wave capacitor C3 is grounded, and the other end of feedback resistance R5 is connect with one end of potentiometer RP1, and potentiometer RP1's is another
One end and center-side are connect with the output end OUT terminal of amplifier IC2, the end circuit output end Uout, the end-V ground connection of amplifier IC2.
Beneficial effects of the present invention are as follows:
Detection circuit scheme of the present invention based on RMS/DC conversion chip, operational amplifier etc., can fully meet base
High-precision, the requirement of the real-time detection of wide scope in the single-phase alternating current virtual value of single-phase current transformer.The circuit is simple,
At low cost, high reliablity, versatility are good, are easy to commercialization.
Detailed description of the invention
Fig. 1 is circuit diagram of the invention.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings.
As shown in Figure 1, the single-phase alternating current high-precision quick detection circuit based on mutual inductor.
Single-phase alternating current high-precision quick detection circuit based on mutual inductor includes that current transformer CS1, RMS/DC turn
It changes chip IC 1, amplifier IC2, transient state and inhibits pipe TV1, potentiometer RP1, I/V resistance R1, input filter resistance R2, output filtered electrical
Hinder R3, negative terminal resistance R4, feedback resistance R5, input filter capacitor C1, capacitance C2, translation filtering capacitor C3, output filtering
Capacitor C4, power capacitor C5, tested current carrying conductor pass through current transformer CS1 detection hole, one of current transformer CS1
The end output end OUT1 inhibits one end of one end of pipe TV1, one end of I/V resistance R1, input filter resistance R2 to connect with transient state, defeated
The end positive input terminal IN+ for entering the other end of filter resistance R2 and one end of input filter capacitor C1, RMS/DC conversion chip IC1 connects
Connect, the end another output OUT2 of current transformer CS1, transient state inhibit the other end of pipe TV1, I/V resistance R1 the other end,
The other end of input filter capacitor C1, one end of capacitance C2 are grounded, and the other end and RMS/DC of capacitance C2 is converted
The end negative input end IN- of chip IC 1 connects, the end positive output end OUT+ of RMS/DC conversion chip IC1 and output filter resistance R3
One end, translation filtering capacitor C3 one end connection, enable end/end EN of RMS/DC conversion chip IC1, the end negative power end-V,
The end ground terminal GND, the end negative output terminal OUT- are grounded, the end positive power source terminal+V of RMS/DC conversion chip IC1 and the positive electricity of amplifier IC2
The end source+V, one end of power capacitor C5, the connection of the circuit power end end+VCC, the other end and output for exporting filter resistance R3 are filtered
The end the positive input terminal IN+ connection of one end, amplifier IC2 of wave capacitor C4, the end negative input end IN- of amplifier IC2 and negative terminal resistance R4
One end, feedback resistance R5 one end connection, the other end of negative terminal resistance R4, the other end of output filter capacitor C4, conversion filter
The other end of wave capacitor C3 is grounded, and the other end of feedback resistance R5 is connect with one end of potentiometer RP1, and potentiometer RP1's is another
One end and center-side are connect with the output end OUT terminal of amplifier IC2, the end circuit output end Uout, the end ground terminal GND of amplifier IC2
Ground connection.
It is used in the present invention all including current transformer CS1, RMS/DC conversion chip IC1, amplifier IC2 etc.
Device is all made of existing matured product, can be obtained by market.Such as: current transformer is using LMZJ series, RMS/DC
Chip uses LTC1968, and amplifier is using TLC4501 etc..
Main circuit parameter matching relationship in the present invention is as follows:
The output signal of current transformer CS1 is ua=kiixR1(unit: V),For tested list
Phase alternating current (unit: A), IxFor tested single-phase alternating current virtual value (unit: A), kiFor the inscription of current transformer CS1
Board parameter electric current ratio.
R1< < R2 (2)
Uoutmax≤Vcc (4)
R in formula1For the resistance value (unit: Ω) of I/V resistance R1, R4、R5The respectively resistance of negative terminal resistance R4, feedback resistance R5
It is worth (unit: Ω), IxmaxFor the maximum virtual value (unit: A) for being tested electric current, Uout、UoutmaxCircuit output respectively of the present invention
Voltage signal and its maximum value (unit: V), VccFor circuit voltage value (unit: V).Formula (5) is that circuit of the present invention is defeated
Relational expression between voltage signal and tested current effective value out.
The course of work of the present invention is as follows:
In Fig. 1, current transformer CS1 output and tested electric currentDirectly proportional electric currentThe electric current is being converted to voltage through I/V resistance R1It is defeated after R2C1 is filtered
Enter to RMS/DC chip IC 1, the output voltage Ud of RMS/DC chip IC 1 is exactly ua(t) virtual value kiR1Ix(unit: V), should
Effective value signal is filtered through R3C4 and i.e. output has as shown in formula (5) with tested electric current after the amplification of core using amplifier IC2
The directly proportional voltage signal of valid value.Because circuit of the present invention avoids diode bridge rectification and power frequency filter circuit, it is achieved that
High-precision, quick detection function based on single-phase current transformer to single-phase alternating current virtual value.
Claims (3)
1. the single-phase alternating current high-precision quick detection circuit based on mutual inductor, it is characterised in that including current transformer CS1,
RMS/DC conversion chip IC1, amplifier IC2, transient state inhibit pipe TV1, potentiometer RP1, I/V resistance R1, input filter resistance R2, defeated
Out filter resistance R3, negative terminal resistance R4, feedback resistance R5, input filter capacitor C1, capacitance C2, translation filtering capacitor C3,
Output filter capacitor C4, power capacitor C5, tested current carrying conductor pass through the detection hole of current transformer CS1, current transformer
An end output end OUT1 of CS1 and transient state inhibit one end of pipe TV1, one end of I/V resistance R1, input filter resistance R2 one
End connection, the other end and one end of input filter capacitor C1, the positive input of RMS/DC conversion chip IC1 of input filter resistance R2
The connection of the end IN+ is held, the end another output OUT2 of current transformer CS1, transient state inhibit the other end, the I/V resistance R1 of pipe TV1
The other end, the other end of input filter capacitor C1, one end of capacitance C2 be grounded, the other end of capacitance C2 with
The end negative input end IN- of RMS/DC conversion chip IC1 connects, the end positive output end OUT+ of RMS/DC conversion chip IC1 and output
One end connection of one end, translation filtering capacitor C3 of filter resistance R3, enable end/end EN, negative electricity of RMS/DC conversion chip IC1
The end source-V, the end ground terminal GND, the end negative output terminal OUT- are grounded, the end positive power source terminal+V of RMS/DC conversion chip IC1 and amplifier
The end positive power source terminal+V of IC2, one end of power capacitor C5, the connection of the circuit power end end+VCC, output filter resistance R3's is another
End connect with the end positive input terminal IN+ of one end of output filter capacitor C4, amplifier IC2, the end negative input end IN- of amplifier IC2 and
One end connection of one end of negative terminal resistance R4, feedback resistance R5, the other end of negative terminal resistance R4, output filter capacitor C4 it is another
End, translation filtering capacitor C3 the other end be grounded, the other end of feedback resistance R5 is connect with one end of potentiometer RP1, current potential
The other end and center-side of device RP1 is connect with the output end OUT terminal of amplifier IC2, the end circuit output end Uout, amplifier IC2-
The end V ground connection.
2. the single-phase alternating current high-precision quick detection circuit according to claim 1 based on mutual inductor, feature exist
It is as follows in the parameter coordination relationship of circuit:
If: the output signal of current transformer CS1 is ua=kiixR1；For tested single-phase alternating current
Stream, IxFor tested single-phase alternating current virtual value, kiFor the nameplate parameter electric current ratio of current transformer CS1:
R1< < R2 (2)
Uoutmax≤Vcc (4)
R in formula1For the resistance value of I/V resistance R1, R4、R5The respectively resistance value of negative terminal resistance R4, feedback resistance R5, IxmaxFor tested electricity
The maximum virtual value of stream, Uout、UoutmaxThe respectively voltage signal and its maximum value of circuit output, VccFor circuit supply voltage
Value；Formula (5) is the relational expression between circuit output voltage signal and tested current effective value.
3. the single-phase alternating current high-precision quick detection circuit according to claim 1 or 2 based on mutual inductor, feature
Be be all made of existing matured product using current transformer CS1, RMS/DC conversion chip IC1, amplifier IC2；Electric current is mutual
For sensor CS1 using LMZJ series, RMS/DC conversion chip IC1 uses LTC1968, amplifier IC2 to use TLC4501.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910753621.XA CN110376420B (en) | 2019-08-15 | 2019-08-15 | Single-phase alternating current high-precision rapid detection circuit based on mutual inductor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910753621.XA CN110376420B (en) | 2019-08-15 | 2019-08-15 | Single-phase alternating current high-precision rapid detection circuit based on mutual inductor |
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| CN110376420A true CN110376420A (en) | 2019-10-25 |
| CN110376420B CN110376420B (en) | 2021-06-22 |
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| CN102735944A (en) * | 2012-07-12 | 2012-10-17 | 杭州电子科技大学 | Direct-current motor armature inductance detection circuit |
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|---|---|---|---|---|
| JP2011017563A (en) * | 2009-07-07 | 2011-01-27 | Sumitomo Precision Prod Co Ltd | Displacement detection device and aircraft |
| CN201637773U (en) * | 2010-04-13 | 2010-11-17 | 浙江容大电力设备制造有限公司 | Collecting circuit of true effective value of multi-path alternating current signals |
| CN202340218U (en) * | 2011-11-29 | 2012-07-18 | 中国航空工业集团公司第六三一研究所 | Alternating current voltage signal preprocessing circuit for analogue circuit |
| CN102495275A (en) * | 2011-12-20 | 2012-06-13 | 中冶南方（武汉）自动化有限公司 | High-precision current detection circuit based on CPU (Central Processing Unit) |
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| CN103941078A (en) * | 2014-04-02 | 2014-07-23 | 云南大学 | High-precision multi-path alternating current true virtual value detection circuit |
| CN204575726U (en) * | 2015-04-02 | 2015-08-19 | 江门职业技术学院 | A kind of LED drive power detection system and equipment |
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| CN208421196U (en) * | 2018-07-31 | 2019-01-22 | 珠海市运泰利自动化设备有限公司 | A kind of ripple effective value measurement device for test equipment |
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| CN110376420B (en) | 2021-06-22 |
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Effective date of registration: 20220217 Address after: Room 2242, No. 3, Xuanhua Road, Changning District, Shanghai 200050 Patentee after: CHINA ELECTRONIC SYSTEMS TECHNOLOGY Co.,Ltd. Address before: 310018 No. 2 street, Xiasha Higher Education Zone, Hangzhou, Zhejiang Patentee before: HANGZHOU DIANZI University |