CN207366625U - A kind of current sampling circuit based on Hall - Google Patents
A kind of current sampling circuit based on Hall Download PDFInfo
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- CN207366625U CN207366625U CN201721199304.0U CN201721199304U CN207366625U CN 207366625 U CN207366625 U CN 207366625U CN 201721199304 U CN201721199304 U CN 201721199304U CN 207366625 U CN207366625 U CN 207366625U
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- arithmetic element
- operational amplifier
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Abstract
The utility model provides a kind of current sampling circuit based on Hall, including Hall sensor, alignment unit, the first arithmetic element, the second arithmetic element and control unit；Hall sensor is used to detect the electric current in place circuit and current signal is changed into first voltage signal to export respectively to the first arithmetic element and the second arithmetic element；Alignment unit is used to export calibration voltage respectively to the first arithmetic element and the second arithmetic element；First arithmetic element is used for the first voltage signal for exporting the first range of Hall sensor and is exported after calibration voltage progress computing to control unit；Second arithmetic element is used for the first voltage signal for exporting the second range of Hall sensor and is exported after calibration voltage progress computing to control unit；Control unit is used to sample the first voltage signal after computing to draw the electric current in circuit.The current sample precision of current sampling circuit provided by the utility model based on Hall is higher and cost is relatively low.
Description
【Technical field】
It the utility model is related to current detection technology field, more particularly to a kind of current sampling circuit based on Hall.
【Background technology】
In electric automobile operational process, the characteristics of numerical value is big and change is big is presented in electric current, and since power bus exist
High pressure, it is ensured that enough safety by current measurement circuit and power bus, it is necessary to realize electrical isolation.
The upper electric current of measurement electric powered motor busbar uses the isolated form current sensing means such as Hall substantially at present.So
And the Hall current sensor of isolated form is divided into open loop Hall and closed loop Hall again, wherein, the precision height but price of closed loop Hall
It is very expensive, it is mainly used for measuring apparatus at this stage, electric automobile can not be used in batches for reasons of cost；Though and open loop Hall
Right cheap but precision is insufficient.
In consideration of it, it is really necessary to provide it is a kind of it is new based on the current sampling circuit of Hall to overcome drawbacks described above.
【Utility model content】
The purpose of this utility model is to provide a kind of current sampling circuit based on Hall, and the electric current based on Hall is adopted
The current sample precision of sample circuit is higher and cost is relatively low.
To achieve these goals, the utility model provides a kind of current sampling circuit based on Hall, including Hall passes
Sensor, alignment unit, the first arithmetic element, the second arithmetic element and control unit；The Hall sensor is used to detect institute
Circuit electric current and current signal changed into first voltage signal export respectively to first arithmetic element and described
Two arithmetic elements；The alignment unit is connected with first arithmetic element and second arithmetic element respectively；The calibration
Unit is used to export calibration voltage respectively to first arithmetic element and second arithmetic element；First arithmetic element
One end be connected respectively with the Hall sensor and the alignment unit, and the other end is connected with described control unit, described
First arithmetic element is used for the first voltage signal for exporting the first range of the Hall sensor and the calibration voltage
Exported after carrying out computing to described control unit；One end of second arithmetic element respectively with the Hall sensor and described
Alignment unit is connected, and the other end is connected with described control unit, and second arithmetic element is used for the Hall sensor
The output of the second range first voltage signal and the calibration voltage carry out computing after output to described control unit；It is described
Control unit be used for respectively to the first voltage signal after first arithmetic element and the second arithmetic element computing into
Row is sampled to draw the electric current in the circuit where the Hall sensor.
In a preferred embodiment, the current sampling circuit based on Hall further includes temperature detecting unit；Institute
Temperature detecting unit is stated with the Hall sensor to be connected to detect the Current Temperatures of the Hall sensor, and by temperature signal
Second voltage signal output is changed into described control unit；Described control unit is additionally operable to carry out the second voltage signal
Sample to obtain the Current Temperatures of the Hall sensor.
In a preferred embodiment, the current sampling circuit based on Hall further includes voltage follow unit；Institute
Voltage follow unit is stated to be connected between the temperature detecting unit and described control unit, the voltage follow unit be used for pair
The second voltage signal is into output after row buffering to described control unit.
In a preferred embodiment, first arithmetic element includes the first operational amplifier, first resistor, second
Resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance and the 8th resistance；First operation amplifier
The in-phase input end of device passes through the first resistor and the second resistance and the first range of the Hall sensor respectively
Output terminal is connected, and the in-phase input end of first operational amplifier also passes through the 3rd resistor and the 4th electricity respectively
Resistance ground connection, the inverting input of first operational amplifier respectively by the 5th resistance and the 6th resistance with it is described
Alignment unit is connected, and the inverting input of first operational amplifier also passes through the 7th resistance and the described 8th respectively
Resistance is connected with the output terminal of first operational amplifier, the output terminal and described control unit of first operational amplifier
It is connected.
In a preferred embodiment, second arithmetic element includes the first operational amplifier, the 9th resistance, the tenth
Resistance, the 11st resistance, the 12nd resistance, the 13rd resistance, the 14th resistance, the 15th resistance and the 16th resistance；It is described
The in-phase input end of second operational amplifier passes through the 9th resistance and the tenth resistance and the Hall sensor respectively
The output terminal of the second range be connected, and the in-phase input end of second operational amplifier also passes through the described 11st electricity respectively
Resistance and the 12nd resistance eutral grounding, the inverting input of second operational amplifier respectively by the 13rd resistance and
14th resistance is connected with the alignment unit, and the inverting input of second operational amplifier also passes through institute respectively
State the 15th resistance and the 16th resistance is connected with the output terminal of second operational amplifier, second operation amplifier
The output terminal of device is connected with described control unit.
In a preferred embodiment, the temperature detecting unit includes detector, the 17th resistance and the 18th
Resistance；The detector is connected with the Hall sensor to detect the Current Temperatures of the Hall sensor；The detector
First end ground connection, and the second end of the detector passes through the 17th resistance and the 18th resistance and electricity respectively
Source is connected, and the second end of the detector is also connected with the voltage follow unit.
In a preferred embodiment, the voltage follow unit include the 3rd operational amplifier, the 19th resistance with
And the 20th resistance；The in-phase input end of 3rd operational amplifier pass through the 19th resistance and the detector the
Two ends are connected；The inverting input of 3rd operational amplifier passes through the 20th resistance and the 3rd operational amplifier
Output terminal be connected, the output terminal of the 3rd operational amplifier is also connected with described control unit.
In a preferred embodiment, the second end of the detector also passes through capacity earth.
In a preferred embodiment, the detector is thermistor.
Current sampling circuit provided by the utility model based on Hall, due to there is provided alignment unit and export calibration electricity
Pressure is calibrated with the output voltage to the Hall sensor, and then improves the precision of sampling, simultaneously as this practicality is new
Type reduces cost using the open loop Hall of double-range while sampling precision is improved.
【Brief description of the drawings】
Fig. 1 is the functional block diagram of the current sampling circuit provided by the utility model based on Hall.
Fig. 2 is the circuit diagram of the current sampling circuit provided by the utility model based on Hall.
【Embodiment】
In order to make the purpose of this utility model, technical solution and advantageous effects become apparent from understanding, below in conjunction with attached
Figure and embodiment, are further elaborated the utility model.It should be appreciated that described in this specification
Embodiment is not intended to limit the utility model just for the sake of explaining the utility model.
When an element was considered with another element " being connected ", it can be directly to another element or
It may be simultaneously present centering elements.Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to this reality
It is identical with the new normally understood implication of those skilled in the art.Made herein in the specification of the utility model
Term is intended merely to the purpose of description specific embodiment, it is not intended that in limitation the utility model.
Referring to Fig. 1, it is the functional block diagram of the current sampling circuit 100 provided by the utility model based on Hall.Institute
Stating the current sampling circuit 100 based on Hall includes battery 10, load 20, Hall sensor 30, alignment unit 40, the first computing
Unit 50, the second arithmetic element 60 and control unit 70.In the present embodiment, the current sampling circuit based on Hall
100 are applied in electric automobile.
Both ends of the both ends of the battery 10 respectively with the load 20 are connected together to a circuit.Wherein, the electricity
Pond 10 can be the power supply of load 20, and the load 20 can also be that the battery 10 charges.In the present embodiment, the electricity
Pond 10 can be the battery pack that electric power is provided for electric automobile.The load 20 can be motor.
The Hall sensor 30 is used to detect the electric current in the circuit and current signal is changed into first voltage signal
Export respectively to first arithmetic element 50 and second arithmetic element 60.Wherein, the Hall sensor 30 is double amounts
Journey Hall sensor, that is, the Hall sensor 30 has the first range and the second range.The first voltage of first range
Signal output is to first arithmetic element 50, the first voltage signal output of the second range to the second arithmetic element 60.At this
In embodiment, the first range of the Hall sensor 30 is -30A~30A；Second range of the Hall sensor 30
For -300A~300A.
The alignment unit 40 is connected with first arithmetic element 50 and second arithmetic element 60 respectively.The school
Quasi- unit 40 is used to export calibration voltage respectively to first arithmetic element 50 and second arithmetic element 60.It can manage
Solution, due to the output voltage of the Hall sensor 30, there are dead band, it is therefore desirable to alignment unit 40 export calibration voltage come into
Row is corrected to improve sampling precision.Wherein, the calibration voltage that the alignment unit 40 exports is according to the specific of Hall sensor 30
Depending on situation.If for example, the first range of the sensor 30 and the output voltage of the second range are 0.25V~4.75V, this
When, 0.25V is dead zone voltage, and therefore, the calibration voltage that the alignment unit 40 exports is 0.25V.
One end of first arithmetic element 50 is connected with the Hall sensor 30 and the alignment unit 40 respectively, and
The other end is connected with described control unit 70.First arithmetic element 40 is used for the first range of the Hall sensor 30
The first voltage signal of output and the calibration voltage are exported to described control unit 70 after carrying out computing.
One end of second arithmetic element 60 is connected with the Hall sensor 30 and the alignment unit 40 respectively, and
The other end is connected with described control unit 70.Second arithmetic element 60 is used for the second range of the Hall sensor 30
The first voltage signal of output and the calibration voltage are exported to described control unit 70 after carrying out computing.
Described control unit 70 is used for respectively to through first arithmetic element 50 and 60 computing of the second arithmetic element
First voltage signal afterwards is sampled to draw the electric current in the circuit where the Hall sensor 30.In present embodiment
In, described control unit 70 is microcontroller.Its voltage range received is 0V~3.3V.Therefore, it is necessary to the first arithmetic element 50
And second the voltage of output of the arithmetic element 60 to Hall sensor 30 carry out after computing output to meet described control unit
70 voltage range of receiving, so as to improve the precision of sampling.
The current sampling circuit 100 based on Hall of offer described in the utility model, due to there is provided alignment unit 40 simultaneously
Output calibration voltage is calibrated with the output voltage to the Hall sensor 30, and then improves the precision of sampling, meanwhile,
Since the utility model is using open loop Hall, cost is reduced while sampling precision is improved.
Further, the current sampling circuit 100 based on Hall further include temperature detecting unit 80 and voltage with
With unit 90.
The temperature detecting unit 80 is connected with the Hall sensor 30 to detect the current of the Hall sensor 30
Temperature, and temperature signal is changed into second voltage signal output to the voltage follow unit 90.
The voltage follow unit 90 is connected between the temperature detecting unit 80 and described control unit 70, the electricity
Pressure follow unit 90 be used for the second voltage signal into output after row buffering to described control unit 70 with realize with it is described
The impedance matching of control unit 70, and then improve the temperature sampling precision of Hall sensor 30.Described control unit 70 is additionally operable to
The second voltage signal by buffering is sampled to obtain the Current Temperatures of the Hall sensor 30.Further
Ground, described control unit 70 is additionally operable to the Current Temperatures according to the Hall sensor 30, according to its temperature compensation coefficient to adopting
Sample to electric current calibrated to further improve the sampling precision of electric current.
Referring again to Fig. 2, it is the circuit theory of the current sampling circuit 100 provided by the utility model based on Hall
Figure.First arithmetic element 50 include the first operational amplifier OP1, first resistor R1, second resistance R2,3rd resistor R3,
4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and the 8th resistance R8.The first operational amplifier OP1
In-phase input end pass through the first amount of the first resistor R1 and second resistance R2 and the Hall sensor 30 respectively
The output terminal of journey is connected, and the in-phase input end of the first operational amplifier OP1 also respectively by the 3rd resistor R3 and
The 4th resistance R4 ground connection, that is, the first resistor R1 and second resistance R2 is parallel relationship and the 3rd electricity
It is parallel relationship to hinder R3 and the 4th resistance R4.The inverting input of the first operational amplifier OP1 is respectively by described
5th resistance R5 and the 6th resistance R6 are connected with the alignment unit 40, and the first operational amplifier OP1's is anti-phase
Input terminal also passes through the output terminal of the 7th resistance R7 and the 8th resistance R8 and the first operational amplifier OP1 respectively
It is connected, that is, the 5th resistance R5 and the 6th resistance R6 is parallel relationship and the 7th resistance R7 and the described 8th
Resistance R8 is parallel relationship.The output terminal of the first operational amplifier OP1 is connected with described control unit 70.
Second arithmetic element 60 includes the first operational amplifier OP2, the 9th resistance R9, the tenth resistance R10, the 11st
Resistance R11, the 12nd resistance R12, the 13rd resistance R13, the 14th resistance R14, the 15th resistance R15 and the 16th resistance
R16.The in-phase input end of the second operational amplifier OP2 passes through the 9th resistance R9 and the tenth resistance R10 respectively
It is connected with the output terminal of the second range of the Hall sensor 30, and the in-phase input end of the second operational amplifier OP2
Also it is grounded respectively by the 11st resistance R11 and the 12nd resistance R12, that is, the 9th resistance R9 and the tenth
Resistance R10 is parallel relationship and the 11st resistance R11 and the 12nd resistance R12 is parallel relationship.Second fortune
The inverting input for calculating amplifier OP2 passes through the 13rd resistance R13 and the 14th resistance R14 and the calibration respectively
Unit 40 is connected, and the inverting input of the second operational amplifier OP2 also passes through the 15th resistance R15 and institute respectively
The output terminal that the 16th resistance R16 is stated with the second operational amplifier OP2 is connected, that is, the 13rd resistance R13 and
14 resistance R14 are parallel relationship and the 15th resistance R15 and the 16th resistance R16 is parallel relationship.Described
The output terminal of two operational amplifier OP2 is connected with described control unit 70.
The temperature detecting unit 80 includes detector 81, the 17th resistance R17 and the 18th resistance R18.The inspection
Gauge head 81 is connected with the Hall sensor 30 to sense the Current Temperatures of the Hall sensor 30.In the present embodiment,
The detector 81 is thermistor, is specifically NTC (Negative Temperature Coefficient) thermistor.
Certainly, the detector can also be PTC (Positive Temperature Coefficient, positive temperature coefficient) temperature-sensitive electricity
Resistance.The first end ground connection (not shown) of the detector 81, and the second end of the detector 81 passes through the described 17th respectively
Resistance R17 and the 18th resistance R18 are connected with power supply, and further, the second end of the detector 81 also passes through electricity
Hold C ground connection, in addition, the second end of the detector is also connected with the voltage follow unit 90.
The voltage follow unit 90 includes the 3rd operational amplifier OP3, the 19th resistance R19 and the 20th resistance
R20.The in-phase input end of the 3rd operational amplifier OP3 pass through the 19th resistance R19 and the detector 81 the
Two ends are connected；The inverting input of the 3rd operational amplifier OP3 passes through the 20th resistance R20 and the 3rd computing
The output terminal of amplifier OP3 is connected, and the output terminal of the 3rd operational amplifier OP3 is also connected with described control unit 70.
The operation principle of the current sampling circuit 100 based on Hall is as follows：
When the institute of the Hall sensor 30 at work, first arithmetic element 50 and second arithmetic element 60 are divided
The first voltage that the first range of the Hall sensor 30 is not exported and the first voltage of the second range output subtract school
Computing is carried out after the calibration voltage of quasi- unit 40, and operation result is exported to control unit 70.70 foundation of described control unit
The scope of sample rate current determines to carry out subsequent treatment using the first range or the second range.The detector 81 is attached at described
To detect its current temperature on Hall sensor 30, when the temperature of Hall sensor 30 changes, the resistance of detector 81
Value can change, and then the voltage for causing the 3rd operational amplifier OP3 in-phase input ends to receive changes, so as to cause to control
The voltage that unit 70 processed receives changes, and therefore, control unit 70 can calculate Hall biography according to the voltage received
The Current Temperatures of sensor 30, calibrate sample rate current further according to the temperature coefficient of Hall sensor, further increase and adopt
The precision of sample.
The utility model is not restricted to described in specification and embodiment, therefore for the personnel of familiar field
For additional advantage and modification is easily achieved, therefore in the universal limited without departing substantially from claim and equivalency range
Spirit and scope in the case of, the utility model is not limited to specific details, representational equipment and shown here as with retouching
The examples shown stated.
Claims (9)
- A kind of 1. current sampling circuit based on Hall；It is characterized in that：Including Hall sensor, alignment unit, the first computing Unit, the second arithmetic element and control unit；The Hall sensor is used for the electric current in circuit where detecting and believes electric current Number change into first voltage signal exports to first arithmetic element and second arithmetic element respectively；The alignment unit It is connected respectively with first arithmetic element and second arithmetic element；The alignment unit is used to export calibration voltage respectively To first arithmetic element and second arithmetic element；One end of first arithmetic element respectively with the hall sensing Device and the alignment unit are connected, and the other end is connected with described control unit, and first arithmetic element is used for by described in suddenly The first voltage signal and the calibration voltage of the first range output of your sensor are exported to the control after carrying out computing Unit；One end of second arithmetic element is connected with the Hall sensor and the alignment unit respectively, and the other end with Described control unit is connected, and second arithmetic element is used for the first voltage for exporting the second range of the Hall sensor Signal and the calibration voltage are exported to described control unit after carrying out computing；Described control unit is used for respectively to described in warp First voltage signal after first arithmetic element and the second arithmetic element computing is sampled to draw the hall sensing The electric current in the circuit where device.
- 2. the current sampling circuit based on Hall as claimed in claim 1, it is characterised in that：The electric current based on Hall is adopted Sample circuit further includes temperature detecting unit；The temperature detecting unit is connected with the Hall sensor to be passed with detecting the Hall The Current Temperatures of sensor, and temperature signal is changed into second voltage signal output to described control unit；Described control unit It is additionally operable to sample to obtain the Current Temperatures of the Hall sensor second voltage signal.
- 3. the current sampling circuit based on Hall as claimed in claim 2, it is characterised in that：The electric current based on Hall is adopted Sample circuit further includes voltage follow unit；The voltage follow unit is connected to the temperature detecting unit and described control unit Between, the voltage follow unit is used for the second voltage signal into output after row buffering to described control unit.
- 4. the current sampling circuit based on Hall as claimed in claim 1, it is characterised in that：First arithmetic element includes First operational amplifier, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance And the 8th resistance；The in-phase input end of first operational amplifier respectively by the first resistor and the second resistance with The output terminal of first range of the Hall sensor is connected, and the in-phase input end of first operational amplifier also leads to respectively The 3rd resistor and the 4th resistance eutral grounding are crossed, the inverting input of first operational amplifier passes through described respectively Five resistance and the 6th resistance are connected with the alignment unit, and the inverting input of first operational amplifier is also distinguished It is connected by the 7th resistance and the 8th resistance with the output terminal of first operational amplifier, first computing is put The output terminal of big device is connected with described control unit.
- 5. the current sampling circuit based on Hall as claimed in claim 1, it is characterised in that：Second arithmetic element includes First operational amplifier, the 9th resistance, the tenth resistance, the 11st resistance, the 12nd resistance, the 13rd resistance, the 14th resistance, 15th resistance and the 16th resistance；The in-phase input end of second operational amplifier passes through the 9th resistance and institute respectively The output terminal that the tenth resistance is stated with the second range of the Hall sensor is connected, and second operational amplifier is same mutually defeated Enter end and also pass through the 11st resistance and the 12nd resistance eutral grounding, the anti-phase input of second operational amplifier respectively End is connected by the 13rd resistance and the 14th resistance with the alignment unit respectively, and second operation amplifier The inverting input of device also passes through the 15th resistance and the 16th resistance and second operational amplifier respectively Output terminal is connected, and the output terminal of second operational amplifier is connected with described control unit.
- 6. the current sampling circuit based on Hall as claimed in claim 3, it is characterised in that：The temperature detecting unit includes Detector, the 17th resistance and the 18th resistance；The detector is connected with the Hall sensor to detect the Hall The Current Temperatures of sensor；The first end ground connection of the detector, and the second end of the detector passes through the described tenth respectively Seven resistance and the 18th resistance are connected with power supply, the second end of the detector also with the voltage follow unit phase Even.
- 7. the current sampling circuit based on Hall as claimed in claim 6, it is characterised in that：The voltage follow unit includes 3rd operational amplifier, the 19th resistance and the 20th resistance；The in-phase input end of 3rd operational amplifier passes through institute The 19th resistance is stated with the second end of the detector to be connected；The inverting input of 3rd operational amplifier passes through described 20 resistance are connected with the output terminal of the 3rd operational amplifier, the output terminal of the 3rd operational amplifier also with the control Unit processed is connected.
- 8. the current sampling circuit based on Hall as claimed in claim 6, it is characterised in that：The second end of the detector is also Pass through capacity earth.
- 9. the current sampling circuit based on Hall as claimed in claim 6, it is characterised in that：The detector is temperature-sensitive electricity Resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721199304.0U CN207366625U (en) | 2017-09-15 | 2017-09-15 | A kind of current sampling circuit based on Hall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721199304.0U CN207366625U (en) | 2017-09-15 | 2017-09-15 | A kind of current sampling circuit based on Hall |
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| Publication Number | Publication Date |
|---|---|
| CN207366625U true CN207366625U (en) | 2018-05-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721199304.0U Expired - Fee Related CN207366625U (en) | 2017-09-15 | 2017-09-15 | A kind of current sampling circuit based on Hall |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109347064A (en) * | 2018-09-30 | 2019-02-15 | 合肥巨动力系统有限公司 | A kind of sampling of three-phase current and overcurrent protection circuit |
-
2017
- 2017-09-15 CN CN201721199304.0U patent/CN207366625U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109347064A (en) * | 2018-09-30 | 2019-02-15 | 合肥巨动力系统有限公司 | A kind of sampling of three-phase current and overcurrent protection circuit |
| CN109347064B (en) * | 2018-09-30 | 2020-08-21 | 上海汽车变速器有限公司 | Three-phase current sampling and overcurrent protection circuit |
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