CN207020235U - A kind of frequency converter three-phase exports bus list resistor current sample circuit - Google Patents
A kind of frequency converter three-phase exports bus list resistor current sample circuit Download PDFInfo
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- CN207020235U CN207020235U CN201720446624.5U CN201720446624U CN207020235U CN 207020235 U CN207020235 U CN 207020235U CN 201720446624 U CN201720446624 U CN 201720446624U CN 207020235 U CN207020235 U CN 207020235U
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- current sample
- dsp
- signaling conversion
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Abstract
A kind of frequency converter three-phase output bus list resistor current sample circuit is the utility model is related to, it includes a milliohm resistance R1, and its one end is connected with IPM inversion units NU, NV, NW, another to be connected to power cathode；Isolating amplifier circuit, it inputs one end that termination milliohm resistance R1 is connected with IPM inversion units NU, NV, NW；Operational amplification circuit, it inputs termination isolating amplifier circuit output end；Signaling conversion circuit, it inputs termination operational amplifier output terminal, and its output end is connected to DSP AD collections port.The current sampling circuit signal reaches DSP AD collections port to signaling conversion circuit again by milliohm resistance sampling through isolating amplifier circuit, calculation fortune amplifying circuit, finally by DSP processing.The more traditional two-way of the program or three road Hall sensors, Europe milli resistor current sample circuit have small volume, low cost and other advantages.
Description
Technical field
It the utility model is related to converter technology field, more particularly to a kind of frequency converter three-phase output bus list resistor current
Sample circuit.
Background technology
Frequency converter is to apply converter technique and microelectric technique, is handed over by changing motor working power Frequency Patterns to control
Flow the electric control appliance of motor.With the rapid development of current converter technology, frequency converter obtains in current industrial production
More and more extensive application is arrived.In Small-power Inverter, volume miniaturization, lightweight also turn into the trend of Developing.
At this stage, current sampling technique sample mode the most universal is to gather three-phase using Hall sensor in frequency converter
Or any two-phase output current, then some peripheral components progress current detecting of arranging in pairs or groups, which technology maturation, have good stability,
But its is with high costs, it is unfavorable for Small-power Inverter production in enormous quantities.Also part producer uses three lower bridge arms of inversion unit
Or bridge arm connects a milliohm resistance to ground respectively under any two, and three tunnels or double are carried out in conjunction with devices such as periphery operational amplifiers
Road current sample, which is brought and volume and the problem of cost is not also best solution.
The content of the invention
The utility model provides a kind of frequency converter three-phase output bus list resistor current sample circuit, and its is simple in construction, raw
It is low to produce cost, small volume, is easy to produce in enormous quantities.
To solve the above problems, the present invention adopts the following technical scheme that.
A kind of frequency converter three-phase exports bus list resistor current sample circuit, including a milliohm resistance R1, its one end with
IPM inversion units NU, NV, NW are connected, another to be connected to power cathode；Isolating amplifier circuit, its input termination milliohm resistance with
IPM inversion units NU, NV, NW connected one end；Operational amplification circuit, it inputs termination isolating amplifier circuit output end；Signal
Change-over circuit, it inputs termination operational amplification circuit output end, and its output end is connected to DSP AD collections port.The current sample
Circuit signal is exported to DSP AD to signaling conversion circuit again by milliohm resistance sampling through isolating amplifier circuit, calculation fortune amplifying circuit
Gather port.
Preferably, described milliohm resistance R1 one end is connected with IPM inversion units NU, NV, NW, the other end is connected to electricity
Source negative pole.
Preferably, the isolating amplifier circuit includes an isolated amplifier U1, wherein：The isolated amplifier U1's
Positive input terminal connecting resistance R4 one end, another milliohm resistance R1 that are connected to of the resistance R4 are connected with IPM inversion units NU, NV, NW
One end；The positive input terminal of the isolated amplifier U1 is also connected to power cathode by electric capacity C2；The isolated amplifier U1
Negative input end is connected to power cathode；The positive and negative output ends of isolated amplifier U1 are respectively connected to the same, anti-phase of operational amplification circuit
Input.
Preferably, the operational amplification circuit includes an operational amplifier U2A, wherein：The operational amplifier U2A
In-phase input end is connected to isolated amplifier U1 positive output ends by resistance R5, and the operational amplifier U2A in-phase input ends are also logical
Cross resistance R7 and electric capacity C4 earths；The operational amplifier U2A inverting inputs are connected to isolated amplifier by resistance R6
U1 negative output terminals, the operational amplifier U2A inverting inputs are also coupled to operational amplifier by resistance R10 and electric capacity C8
U2A output ends.
Preferably, signaling conversion circuit includes resistance R8, resistance R9, inductance L1, electric capacity C7 and double diode D1, its
In：Resistance R8 and inductance the L1 series connection, the inductance L1 other ends are connected to operational amplifier U2A output ends, the resistance R8 other ends
It is connected to DSP AD collections port；Described resistance R9 one end is connected with resistance R8 and DSP AD sample ports, another termination power
3.3V；Described electric capacity C7 one end is connected with resistance R8 and DSP AD sample ports, other end ground connection；Among the double diode D1
Pole is connected with resistance R8 and DSP AD sample ports, and its plus earth, its negative electrode meets power supply 3.3V.
The utility model provides a kind of frequency converter three-phase output bus list resistor current sample circuit, including a milliohm electricity
Hinder R1, isolating amplifier circuit, operational amplification circuit, signaling conversion circuit.When frequency converter operation enters working condition, IPM modules
Inversion unit motor electric current flows out to milliohm resistance R1, milliohm resistance R1 as current sample electricity through lower bridge arm NU, NV, NW
Resistance produces voltage signal, and the voltage signal is sampled signal, and sampled signal is input to isolating amplifier circuit via resistance R4, every
Sampled signal is carried out from amplifying circuit to input operational amplification circuit again after accordingly amplifying, sampled signal is defeated from operational amplification circuit
After going out, now sampled signal converts thereof into the voltage signal that can be identified by DSP by signaling conversion circuit again, it is achieved thereby that
To the current sample of inversion unit output.For this sample circuit compares current techniques, Hall element has been replaced, compared with
Three tunnels or two-way Europe milli resistor current sample circuit have larger simplification, improved, using relatively conventional inexpensive element, greatly
Big reduces circuit production cost and small product size.
Brief description of the drawings
Fig. 1 is the utility model frequency converter three-phase output bus list resistor current sample circuit structural representation.
Fig. 2 is the utility model frequency converter three-phase output bus list resistor current sample circuit figure.
Embodiment
The embodiment provided below in conjunction with accompanying drawing, further illustrate frequency converter three-phase output bus list electricity of the present utility model
Hinder the embodiment of current sampling circuit.
As shown in figure 1, this current sampling resistor includes a milliohm resistance R1, its one end and the NU of IPM inversion units 10,
NV, NW are connected, another to be connected to power cathode；Isolating amplifier circuit 20, it inputs termination milliohm resistance R1 and IPM inversion units
One end connected 10 NU, NV, NW；Operational amplification circuit 30, it inputs the termination output end of isolating amplifier circuit 20；Signal is changed
Circuit 40, it inputs the termination output end of operational amplification circuit 30, and its output end is connected to DSP AD collections port 50.The electric current is adopted
Sample circuit signal is sampled defeated to signaling conversion circuit 40 again through isolating amplifier circuit 20, calculation fortune amplifying circuit 30 by milliohm resistance R1
Go out to DSP AD and gather port 50.
With reference to shown in Fig. 1 and Fig. 2, in the present embodiment, the milliohm resistance R1 as current sampling resistor, its one end with
IPM inversion units 10 NU, NV, NW are connected, another termination power cathode, realize and IPM inversion units 10 NU, NV, NW are flowed
Go out the sampling of bus current.
With reference to shown in Fig. 1 and Fig. 2, in the present embodiment, the isolating amplifier circuit 20 includes an isolated amplifier U1, its
In：Positive input terminal connecting resistance R4 one end of the isolated amplifier U1, the resistance R4 is another to be connected to milliohm resistance R1 and IPM
Inversion unit NU, NV, NW connected one end；The positive input terminal of the isolated amplifier U1 is also connected to power supply by electric capacity C2 and born
Pole；The isolated amplifier U1 negative input ends are connected to power cathode；The positive and negative output ends of isolated amplifier U1 are respectively connected to transport
Calculate same, the inverting input of amplifying circuit 30.The isolating amplifier circuit 20 inputs milliohm resistance R1 samplings via resistance R4
Voltage signal, after being handled by isolated amplifier U1 sampled signal, it is input to operational amplification circuit 30 and is further processed.
With reference to shown in Fig. 1 and Fig. 2, in the present embodiment, the operational amplification circuit 30 includes an operational amplifier U2A,
Wherein：The operational amplifier U2A in-phase input ends are connected to isolated amplifier U1 positive output ends by resistance R5, and the computing is put
Big device U2A in-phase input ends also pass through resistance R7 and electric capacity C4 earths；The operational amplifier U2A inverting inputs pass through
Resistance R6 is connected to isolated amplifier U1 negative output terminals, and the operational amplifier U2A inverting inputs also pass through resistance R10 and electric capacity
C8 is coupled to operational amplifier U2A output ends.The operational amplification circuit 30 passes through resistance R5, resistance R6, resistance R7, resistance
R10 and operational amplifier U2A combinations carry out scaling effect to sampled signal, then pass through operational amplifier U2A output ends
Signal output after processing to signaling conversion circuit 40 is further processed.
With reference to shown in Fig. 1 and Fig. 2, in the present embodiment, the signaling conversion circuit 40 includes resistance R8, resistance R9, inductance
L1, electric capacity C7 and double diode D1, wherein：Resistance R8 and inductance the L1 series connection, the inductance L1 other ends are connected to operation amplifier
Device U2A output ends, the resistance R8 other ends are connected to DSP AD collections port 50；Described resistance R9 one end and resistance R8 and DSP AD
Sample port 50 is connected, another termination power 3.3V；Described electric capacity C7 one end is connected with resistance R8 and DSP AD sample ports 50,
The other end is grounded；The double diode D1 dynodes are connected with resistance R8 and DSP AD sample ports 50, its plus earth, and it is cloudy
Pole meets power supply 3.3V.The signaling conversion circuit 40 mainly realizes that sampled signal is changed by resistance R8 and resistance R9, after conversion
Signal can fully by DSP AD collection port 50 identify.The signal changed through resistance R8 and resistance R9 first passes around double two pole D1
Realize that clamper is protected, final sampled signal is inputted to DSP AD sample ports 50.
The utility model provides a kind of frequency converter three-phase output bus list resistor current sample circuit, including a milliohm electricity
Hinder R1, isolating amplifier circuit 20, operational amplification circuit 30, signaling conversion circuit 40.When frequency converter operation enters working condition,
IPM modules inversion unit motor electric current flows out to milliohm resistance R1 through lower bridge arm NU, NV, NW, and milliohm resistance R1 is as electricity
Flow sampling resistor and produce voltage signal, the voltage signal is sampled signal, and sampled signal is input to isolation via resistance R4 and put
Big circuit 20, isolating amplifier circuit 20 carry out inputting operational amplification circuit 30, sampled signal again after accordingly amplifying to sampled signal
After the output of operational amplification circuit 30, now sampled signal is converted thereof into and can identified by DSP by signaling conversion circuit 40 again
Voltage signal, it is achieved thereby that to inversion unit output current sample.This sample circuit compared to current techniques and
Speech, has replaced Hall element, has larger simplification compared with three tunnels or two-way Europe milli resistor current sample circuit, improves, uses
Relatively conventional inexpensive element, greatly reduces circuit production cost and small product size.
Above content is to combine specific preferred embodiment further detailed description of the utility model, it is impossible to
Assert that specific implementation of the present utility model is confined to these explanations.For the ordinary skill of the utility model art
For personnel, without departing from the concept of the premise utility, some simple deduction or replace can also be made, should all be regarded
To belong to the scope of protection of the utility model.
Claims (1)
1. a kind of frequency converter three-phase exports bus list resistor current sample circuit, it is characterised in that including a milliohm resistance R1,
Isolating amplifier circuit（20）, operational amplification circuit（30）, signaling conversion circuit（40）；The milliohm resistance R1, isolation amplification electricity
Road（20）, operational amplification circuit（30）, signaling conversion circuit（40）It is sequentially connected；The milliohm resistance R1 is current sample electricity
Resistance, the current sampling resistor will be from IPM inversion units（10）The current signal of collection changes into voltage signal and exported to isolation
Amplifying circuit（20）, through isolating amplifier circuit（20）Signal transacting is exported to operational amplification circuit again（30）, then put through computing
Big circuit（30）Signal transacting is exported to signaling conversion circuit（40）, finally by signaling conversion circuit（40）Signal is turned
Change and transmit to DSP AD and gather port（50）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720446624.5U CN207020235U (en) | 2017-04-26 | 2017-04-26 | A kind of frequency converter three-phase exports bus list resistor current sample circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720446624.5U CN207020235U (en) | 2017-04-26 | 2017-04-26 | A kind of frequency converter three-phase exports bus list resistor current sample circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207020235U true CN207020235U (en) | 2018-02-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720446624.5U Expired - Fee Related CN207020235U (en) | 2017-04-26 | 2017-04-26 | A kind of frequency converter three-phase exports bus list resistor current sample circuit |
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| Country | Link |
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| CN (1) | CN207020235U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108933552A (en) * | 2018-06-04 | 2018-12-04 | 青岛海尔智能电子有限公司 | Variable-frequency motor current sampling circuit and frequency conversion equipment |
-
2017
- 2017-04-26 CN CN201720446624.5U patent/CN207020235U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108933552A (en) * | 2018-06-04 | 2018-12-04 | 青岛海尔智能电子有限公司 | Variable-frequency motor current sampling circuit and frequency conversion equipment |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180216 |
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| CF01 | Termination of patent right due to non-payment of annual fee |