CN206114766U - Electric automobile current measurement circuit - Google Patents
Electric automobile current measurement circuit Download PDFInfo
- Publication number
- CN206114766U CN206114766U CN201621196621.2U CN201621196621U CN206114766U CN 206114766 U CN206114766 U CN 206114766U CN 201621196621 U CN201621196621 U CN 201621196621U CN 206114766 U CN206114766 U CN 206114766U
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- Prior art keywords
- resistance
- mcu
- pin
- chopping switch
- amplifier
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Abstract
The utility model discloses an electric automobile current measurement circuit, including shunting resistance, copped wave switch, dc amplifier, AD adc and MCU, shunting resistance is used for inserting batteries of electric vehicle to flowing through, the battery electric current produce voltage signal when, the copped wave switch is connected with shunting resistance both ends for the voltage signal who produces shunting resistance carries out copped wave, dc amplifier is connected with copped wave switch and AD adc simultaneously for two voltage signal are exported respectively when opening to the copped wave switch closure, so that AD adc gathers in turn, AD adc and MCU are connected for two voltage signal that will gather convert data signal to and export MCU to, so that MCU calculates the difference of two voltages, calculate the magnitude of voltage that shunting resistance produced then, accomplish the measurement of electric current. The utility model discloses easy and simple to handle, low cost have realized the substitution to the special IC measuring current of tradition well.
Description
Technical field
The utility model is related to a kind of measuring circuit, and in particular to be a kind of electric automobile current measurement circuit.
Background technology
At present, new energy electric motor vehicle is to utilize the battery as energy storage device, therefore, the charging and discharging currents to electric automobile
Measure and be highly desirable to, on the one hand it is monitoring Vehicular system whether normal work that the purpose of do so is, such as monitors electricity
When stream sets the scope of thresholding more than certain, it is believed that vehicle there occurs internal short circuits；On the other hand it is then for electricity
Pond SOC is calculated.Battery SOC affects car load moment of torsion as an important parameter in whole electric vehicle control, its computational accuracy
The accuracy of management and the validity of the switching of charge and discharge mode.Presently the most accurate SOC computational methods are ampere-hour integration
The combined techniques of core open-circuit voltage, ampere-hour integration method is charging or discharging current to the integrated value of time and the ratio of battery capacity, therefore SOC
Calculate directly relevant with the acquisition precision of electric current.Based on this, at present a kind of more accurate mode of measurement electric current is shunting electricity
Resistance mode measures electric current.
However, the current measurement mode of existing electric automobile is to employ special IC to carry out current measurement, not only
Troublesome poeration, and it is higher to hardware design requirement, and cost is not also cheap, thus largely have impact on batteries of electric automobile
The measurement efficiency of electric current.
Utility model content
The purpose of this utility model is to provide a kind of electric automobile current measurement circuit, mainly solves existing measurement electricity
There is troublesome poeration, high cost in the mode of electrical automobile battery current.
To achieve these goals, the technical solution adopted in the utility model is as follows：
A kind of electric automobile current measurement circuit, including shunt resistance, chopping switch, dc amplifier, A/D analog-to-digital conversions
Device and MCU, wherein：
Shunt resistance, for accessing batteries of electric automobile, and produces voltage signal when battery current flows through；
Chopping switch, is connected with shunt resistance two ends, and wherein one end accesses the VDD of 5V by divider resistance R1, another
End is grounded by divider resistance R2, and the chopping switch is used to carry out copped wave to the voltage signal that shunt resistance is produced；
Dc amplifier, while the VDD, chopping switch and A/D analog-digital converters with 5V is connected, and while ground connection, is used for
Chopping switch is closed and exports two voltage signals respectively when opening, so that A/D analog-digital converters are gathered in turn；
A/D analog-digital converters, are connected with MCU, and access the VDD of 5V, for two voltage signals of collection to be converted into
Data signal is exported to MCU, so that MCU calculates the difference of two voltage, the magnitude of voltage of shunt resistance generation is calculated then,
Complete the measurement of electric current.
Specifically, the dc amplifier includes operational amplifier, resistance Rf and resistance Ri；The operational amplifier draws
Pin 3 connects one end that chopping switch is connected with divider resistance R1, and pin 4 meets the VDD of 5V, and pin 6 connects A/D analog-digital converters, pin 7
Ground connection；The termination operational amplifiers of resistance Rf mono- pin 2, another termination operational amplifier pin 6；The resistance Ri mono- is terminated
Operational amplifier pin 2, another termination chopping switch is connected with one end of divider resistance R2.
Further, current-limiting resistance R3 is also associated between the chopping switch and divider resistance R1.
Compared with prior art, the utility model has the advantages that：
The utility model passes through design chopping switch, dc amplifier, A/D analog-digital converters, MCU, using chopping switch
Operation, realize the output of two voltage signals of dc amplifier, and numeral is gathered and be converted in A/D analog-digital converters
After signal, by calculate compensation offset the biased error of A/D analog-digital converters, the unbalance voltage of divider resistance R1 and R2 and
After the own input voltage offset of operational amplifier, you can the magnitude of voltage of shunt resistance is obtained, so as to complete the measurement of electric current.This
Utility model only needs simple circuit design to be capable of achieving the measurement of batteries of electric automobile electric current without using application-specific integrated circuit, thus
It is not only easy to operate, and cost is very cheap, and the requirement to hardware design is not also high.The utility model greatly improved to electricity
The efficiency of electrical automobile battery current measurement.
Description of the drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Specific embodiment
With reference to the accompanying drawings and examples the utility model is described in further detail, and embodiment of the present utility model includes
But it is not limited to the following example.
Embodiment
As shown in figure 1, the utility model provides a kind of new electric automobile current measurement circuit, it includes shunting electricity
Resistance, chopping switch, dc amplifier, A/D analog-digital converters and MCU.The shunt resistance is used to access batteries of electric automobile, and
Voltage signal is produced when battery current flows through；The chopping switch is used to cut the voltage signal that shunt resistance is produced
Ripple, the chopping switch is connected with shunt resistance two ends simultaneously, and wherein one end accesses the VDD of 5V by divider resistance R1, and
And current-limiting resistance R3 is also associated between chopping switch and divider resistance R1, meanwhile, the other end of chopping switch is by partial pressure electricity
Resistance R2 ground connection.The dc amplifier is used for chopping switch and closes and export two voltage signals respectively when opening, so as to A/D moulds
Number converter is gathered in turn, and the dc amplifier includes operational amplifier, resistance Rf and resistance Ri；The operational amplifier pin
3 connect one end that chopping switch is connected with divider resistance R1, and pin 4 meets the VDD of 5V, and pin 6 connects A/D analog-digital converters, and pin 7 connects
Ground；The termination operational amplifiers of resistance Rf mono- pin 2, another termination operational amplifier pin 6；The terminations of resistance Ri mono- fortune
Amplifier pin 2 is calculated, another termination chopping switch is connected with one end of divider resistance R2.
The A/D analog-digital converters are connected with MCU, and access the VDD of 5V, for two voltage signals of collection to be changed
Export to MCU into data signal, so that MCU calculates the difference of two voltage, the voltage of shunt resistance generation is calculated then
Value, completes the measurement of electric current.
The process of the utility model measurement electric current is as follows：
（1）Closure chopping switch, op-amp output voltage signal U1, and gathered by A/D analog-digital converters；
（2）Chopping switch, op-amp output voltage signal U2 are disconnected, and is gathered by A/D analog-digital converters；
（3）Two voltage signals for gathering are changed into data signal by A/D analog-digital converters, and are transmitted to MCU, by MCU
The difference of two voltage is calculated, the magnitude of voltage Ui of shunt resistance generation is then calculated by following equation, you can complete electric current
Measurement：
Ui=(U2-U1)/(G+0.5)
In formula, G is the gain of operational amplifier, and G is equal to the resistance of the resistance divided by resistance Ri of resistance Rf.
The topology that the utility model passes through analog amplifier circuit, only need to utilize the dc amplifier of low input offset Vos+
Chopping switch and MCU and A/D analog-digital converters, you can complete the measurement of batteries of electric automobile electric current, it compares existing electric current
It is not only simple to operate, with low cost, less demanding to hardware design for metering system, and with patent " New energy electric
After the Principle Method that car shunting digital current sensor " is provided is combined, a kind of high-precision current sense can also be produced
Device.Therefore, the utility model compared to existing technology for, technological progress is fairly obvious, with prominent substantive distinguishing features and aobvious
The progress of work.
According to above-described embodiment, the utility model just can be well realized.What deserves to be explained is, based on said system structure
And be to solve same technical problem, even if making some on the utility model again has no substance on the premise of method is designed
Change or polishing, its technical scheme for being adopted essence still as the utility model, should be included in this reality
Within new protection domain.
Claims (3)
1. a kind of electric automobile current measurement circuit, it is characterised in that including shunt resistance, chopping switch, dc amplifier, A/
D analog-digital converters and MCU, wherein：
Shunt resistance, for accessing batteries of electric automobile, and produces voltage signal when battery current flows through；
Chopping switch, is connected with shunt resistance two ends, and wherein one end accesses the VDD of 5V by divider resistance R1, and the other end leads to
Divider resistance R2 ground connection is crossed, the chopping switch is used to carry out copped wave to the voltage signal that shunt resistance is produced；
Dc amplifier, while the VDD, chopping switch and A/D analog-digital converters with 5V is connected, and while ground connection, for copped wave
Two voltage signals are exported respectively when switch closure and opening, so that A/D analog-digital converters are gathered in turn；
A/D analog-digital converters, are connected with MCU, and access the VDD of 5V, for two voltage signals of collection to be converted into into numeral
Signal output, so that MCU calculates the difference of two voltage, calculates the magnitude of voltage of shunt resistance generation then to MCU, completes
The measurement of electric current.
2. a kind of electric automobile current measurement circuit according to claim 1, it is characterised in that the dc amplifier bag
Include operational amplifier, resistance Rf and resistance Ri；The operational amplifier pin 3 connects chopping switch is connected with divider resistance R1 one
End, pin 4 meets the VDD of 5V, and pin 6 connects A/D analog-digital converters, and pin 7 is grounded；The terminations of resistance Rf mono- operational amplifier draws
Pin 2, another termination operational amplifier pin 6；The termination operational amplifiers of resistance Ri mono- pin 2, another termination chopping switch
It is connected with one end of divider resistance R2.
3. a kind of electric automobile current measurement circuit according to claim 2, it is characterised in that the chopping switch with point
Current-limiting resistance R3 is also associated between piezoresistance R1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621196621.2U CN206114766U (en) | 2016-10-31 | 2016-10-31 | Electric automobile current measurement circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621196621.2U CN206114766U (en) | 2016-10-31 | 2016-10-31 | Electric automobile current measurement circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206114766U true CN206114766U (en) | 2017-04-19 |
Family
ID=58525788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621196621.2U Expired - Fee Related CN206114766U (en) | 2016-10-31 | 2016-10-31 | Electric automobile current measurement circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206114766U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443156A (en) * | 2016-10-31 | 2017-02-22 | 成都雅骏新能源汽车科技股份有限公司 | Current measuring circuit for electrical automobile and realization method of current measuring circuit |
| TWI711827B (en) * | 2019-08-28 | 2020-12-01 | 新煒科技有限公司 | Current measurement system |
-
2016
- 2016-10-31 CN CN201621196621.2U patent/CN206114766U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443156A (en) * | 2016-10-31 | 2017-02-22 | 成都雅骏新能源汽车科技股份有限公司 | Current measuring circuit for electrical automobile and realization method of current measuring circuit |
| CN106443156B (en) * | 2016-10-31 | 2023-06-30 | 成都雅骏新能源汽车科技股份有限公司 | Electric automobile current measurement circuit |
| TWI711827B (en) * | 2019-08-28 | 2020-12-01 | 新煒科技有限公司 | Current measurement system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20170419 Termination date: 20191031 |