CN106526304A - Shunting type digital current sensor for new energy electric vehicle - Google Patents
Shunting type digital current sensor for new energy electric vehicle Download PDFInfo
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- CN106526304A CN106526304A CN201610973276.7A CN201610973276A CN106526304A CN 106526304 A CN106526304 A CN 106526304A CN 201610973276 A CN201610973276 A CN 201610973276A CN 106526304 A CN106526304 A CN 106526304A
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- copper
- current sensor
- aluminium base
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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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a shunting type digital current sensor for a new energy electric vehicle. The shunting type digital current sensor sequentially comprises an electronic component, a copper foil circuit layer, an insulating layer and a copper/aluminum substrate from top to bottom. The copper foil circuit of the copper foil circuit layer passes through the insulating layer to be connected with the copper/aluminum substrate. The electronic component passes through the copper foil circuit layer to be connected with the copper/aluminum substrate. The current sensor of the present invention is high in precision, and is applicable to electric vehicles. The current sensor of the invention can be manufactured by the equipment of existing PCB manufacturers instead of high-precision manufacture equipment.
Description
Technical field
The present invention relates to a kind of new energy electric motor vehicle shunting digital current sensor.
Background technology
New energy electric motor vehicle utilizes the battery as energy storage device.In electric vehicle, battery discharge device, battery need be
Drive vehicle to provide tens peaces, the electric current of even hundreds of peace, and in charging device, charging current is typically all in tens peaces.
On the one hand the purpose of electric motor car measurement charging and discharging currents is monitoring Vehicular system whether normal work, and such as vehicle occurs
During short circuit, when monitoring current is more than certain setting threshold range, it is believed that vehicle there occurs internal short circuits；It is another
Aspect measurement electric current purpose is calculated for battery SOC.Battery SOC as an important parameter in whole electric vehicle control,
The computational accuracy of SOC affects the accuracy of car load torque management, the effectiveness of the switching of charge and discharge mode.It is presently the most accurate
Combined techniqueses of the SOC computational methods for ampere-hour integral kernel open-circuit voltage, ampere-hour integration method be charging or discharging current to the integrated value of time with
The ratio of battery capacity, therefore the calculating of SOC is directly relevant with the acquisition precision of electric current.
At present, it is that shunt resistance mode measures electric current to measure a kind of more accurate mode of electric current.
Shunt resistance makes current sensor using copper-manganese, constantan material, due to measuring electric current typically in tens peaces, or even
Peaces up to a hundred.The volume ratio of shunt resistance is larger, and resistance is typically in 100 microhms or so.Manufacture high-precision electric current to pass
Sensor, needs the high-precision manufacturing equipment of comparison, complicated manufacturing process, complicated testing equipment.
Existing current sensor makes current sensor using copper-manganese, constantan material, and which generally provides accurate resistance.With
Voltage on family measurement current sensor.Current value is obtained by formula I=U/R.Due to measuring voltage U, current sense
Device resistance R has certain error, obtains electric current I values and there is certain error.Meanwhile, the volume ratio of shunt resistance is larger, resistance resistance
Value is typically in 100 microhms or so.High-precision current sensor is manufactured, the high-precision manufacturing equipment of comparison, complexity is needed
Manufacturing process, complicated testing equipment, the cost of current sensor is higher.
The content of the invention
In order to improve the problems referred to above, it is an object of the invention to provide a kind of new energy electric motor vehicle shunting digital current is passed
Sensor.
To achieve these goals, the technical solution used in the present invention is as follows：
New energy electric motor vehicle shunting digital current sensor, including the electronic component, Copper Foil that from top to bottom set gradually
Line layer, insulating barrier, copper/aluminium base；The copper foil circuit of the copper foil circuit layer is connected through insulating barrier with copper/aluminium base；Institute
State electronic component to be connected with copper/aluminium base by copper foil circuit layer.
Further, the electronic component includes voltage signal amplifier, A/D digital to analog converters, MCU, EEPROM and leads to
Communication interface, and for detecting the temperature sensor of copper/aluminium base plate temperature；The A/D digital to analog converters, temperature sensor,
EEPROM, communication interface are connected with MCU respectively；The voltage signal amplifier and A/D digital to analog converters and copper/aluminium base phase
Even.
Wherein, copper/aluminium base is primarily used to super-high-current, can produce small voltage when electric current passes through copper/aluminium base
Signal.
Voltage signal amplifier：The voltage signal that copper/aluminium base is produced is sent to voltage signal amplifier, is put by voltage signal
After big device carries out the amplification of certain multiple, A/D digital to analog converters are then sent through.
A/D digital to analog converters are converted to digital signal to the analog voltage signal that voltage signal amplifier is brought.
MCU：MCU receives the digital signal of A/D digital to analog converters, is converted to the current signal of numeral through certain process.
MCU will be also compensated to digital current signal by the temperature of temperature sensor measurement copper/aluminium base；Temperature
Supplementation with copper/aluminium base is because the change of ambient temperature causes the conversion of copper/aluminium base resistance.
Communicated with external calibration module, received calibration digital calibration current signal, the electric current to copper/aluminium base sensing
Signal is calibrated.
The calibration parameter of reset current is to EEPROM.
Temperature sensor：The temperature of collection copper/aluminium base.
EEPROM：The calibration parameter of record current.
Communication interface：Communicated with foreign current calibration instrument.
Yet further, the copper/aluminium base is made by copper product or aluminum.
The present invention compared with prior art, with advantages below and beneficial effect：
The current sensor high precision of the present invention, it is adaptable to electric vehicle；And the making of current sensor of the present invention is not
High-precision manufacturing equipment is needed, can be made using the equipment of existing pcb board producer.
Description of the drawings
Fig. 1 is the structural representation of the present invention.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples, and embodiments of the present invention are included but is not limited to
The following example.
Embodiment
As shown in figure 1, new energy electric motor vehicle shunting digital current sensor, including the electronics for from top to bottom setting gradually
Element 1, copper foil circuit layer 2, insulating barrier 3, copper/aluminium base 4；The copper foil circuit of the copper foil circuit layer through insulating barrier and copper/
Aluminium base is connected；The electronic component is connected with copper/aluminium base by copper foil circuit layer.Wherein, the copper/aluminium base is by copper material
Material or aluminum are made.What deserves to be explained is the present invention is making current sensor using copper/aluminium base.
Specifically, the electronic component includes voltage signal amplifier, A/D digital to analog converters, MCU, EEPROM and communication
Interface, and for detecting the temperature sensor of copper/aluminium base plate temperature；The A/D digital to analog converters, temperature sensor,
EEPROM, communication interface are connected with MCU respectively；The voltage signal amplifier and A/D digital to analog converters and copper/aluminium base phase
Even.
Copper/the aluminium base of the present invention has small resistance, when there is electric current to flow through copper/aluminium base, will above copper/aluminium base
Small voltage signal is produced, after being amplified process to faint current signal, is exactly the current signal of my needs.
The calibration steps of the current sensor of the present invention is as follows：
Correcting current module can be passed through from the higher current sensor of precision, the parametric calibration electric current of current sensor
Communication interface is obtained from calibration module.
1st, under the standard temperature of calculating current sensor (25 DEG C) resistance value R25。
Method is to be passed through a certain normalized current I of current sensorT, obtain temperature Tx (the calibration temperature of current copper/aluminium base
It is not necessarily 25 DEG C).
There is formula：RX*TT=UOFormula is 1.
UORepresent that digital to analog converter ADC measures current sensor voltage.
Tcr=(RX-R25)/(R25*(TX-T25)) formula is 2.
T25Represent that temperature is 25 DEG C.
TcrRepresent temperature-coefficient of electrical resistance.Metal is constant in certain temperature range temperature-coefficient of electrical resistance.
1. and 2. pushed away by formula：
R25=UO/(IT*(1+Tcr*(TX-T25)))
2nd, by previously obtained resistance value R of current sensor25, R can be passed through25Worth electric current.
I=U/ (R25*(1+Tcr*(T-T25))) formula is 3.
TcrFor known quantity, due to R25It is not an accurate value to obtain value, and it is affected by A/D digital to analog converters, electric current
The current value that sensor is surveyed needs to carry out secondary correction.
Order calibration electric current is I1、I2、I3、I4、……In-1、In, by current sensor.
It is measurable to the voltage U produced on current sensory1、Uy2、Uy3、Uy4、……Uyn-1、Uyn.3. can be counted by formula
The current value for calculating current sensor is Iy1、Iy2、Iy3、Iy4、……Iyn-1、Iyn。
The electric current of arbitrary size can after calibration equation is calibrated value：
I=(Iy-Iyn-1)*(In-In-1)/(Iyn-Iyn-1)+In-1。IyMeet：Iyn-1≤Iy≤Iyn。
Calibration electric current I1、I2、I3、I4、……In-1、InWith corresponding current sensor detected current value Iy1、Iy2、Iy3、
Iy4、……Iyn-1、IynEEPROM is stored in, facilitates later stage MCU calculating current to carry out computation of table lookup.
What deserves to be explained is, the present invention compared with prior art, works as current sensor using common copper material and aluminium,
Current sensor can be made of copper aluminium base PCB, and copper aluminium base can be given professional pcb board producer and make.Compare with existing
Current sensor make, original accurate resistance value, temperature pair need not be obtained using the current sensor of copper/aluminium base
The resistivity effects of copper/aluminum are more than copper-manganese or constantan material, but eliminate temperature using temperature sensor (such as critesistor NTC thermometrics)
Impact of the degree to copper/aluminum resistivity.
Current sensor is made using copper/aluminium base mode, MCU, voltage signal amplifier, temperature sensor can be direct
It is connected on copper/aluminium base, it is possible to reduce outside that small-signal current measurement is affected.
It is difficult to do together MCU, voltage signal amplifier, temperature sensor using prior art current sensor.Only
Can will be current sensor and MCU, voltage signal amplifier, temperature sensor separated, be so readily incorporated certain interference.
Existing shunt resistance current sensor needs the resistance exact value of adjustment shunt resistance.And the current sense of the present invention
The current value of the direct adjustment current sensor output of device, eliminates the exact value of adjustment shunt resistance, compares existing shunt resistance
Flow measurement can more provide accurate current value.
According to above-described embodiment, the present invention just can be realized well.What deserves to be explained is, before said structure design
Put, be to solve same technical problem, even if some made in the present invention are adopted without substantial change or polishing
Technical scheme essence still as the present invention, therefore which should also be as within the scope of the present invention.
Claims (3)
1. a kind of new energy electric motor vehicle shunting digital current sensor, it is characterised in that including what is from top to bottom set gradually
Electronic component（1）, copper foil circuit layer（2）, insulating barrier（3）, copper/aluminium base（4）；The copper foil circuit of the copper foil circuit layer is passed through
Insulating barrier is connected with copper/aluminium base；The electronic component is connected with copper/aluminium base by copper foil circuit layer.
2. new energy electric motor vehicle shunting digital current sensor according to claim 1, it is characterised in that the electronics
Element includes voltage signal amplifier, A/D digital to analog converters, MCU, EEPROM and communication interface, and for detecting copper/aluminium base
The temperature sensor of plate temperature；The A/D digital to analog converters, temperature sensor, EEPROM, communication interface are connected with MCU respectively；
The voltage signal amplifier is connected with A/D digital to analog converters and copper/aluminium base.
3. new energy electric motor vehicle shunting digital current sensor according to claim 1 and 2, it is characterised in that described
Copper/aluminium base is made by copper product or aluminum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610973276.7A CN106526304A (en) | 2016-10-31 | 2016-10-31 | Shunting type digital current sensor for new energy electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610973276.7A CN106526304A (en) | 2016-10-31 | 2016-10-31 | Shunting type digital current sensor for new energy electric vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN106526304A true CN106526304A (en) | 2017-03-22 |
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| CN201610973276.7A Pending CN106526304A (en) | 2016-10-31 | 2016-10-31 | Shunting type digital current sensor for new energy electric vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208715A (en) * | 2019-07-02 | 2019-09-06 | 上海禾他汽车科技有限公司 | A kind of method and automobile batteries management system measuring automobile batteries packet state of charge |
| CN113815439A (en) * | 2020-06-19 | 2021-12-21 | 安波福中央电气（上海）有限公司 | Onboard shunt current sensor in ICCPD (integrated circuit control power supply) of electric automobile |
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| WO2001069269A2 (en) * | 2000-03-17 | 2001-09-20 | Sauer-Danfoss Holding A/S | Device for measuring an electric current that flows through a strip conductor |
| CN200996974Y (en) * | 2007-01-17 | 2007-12-26 | 梁柏青 | Welding current and voltage detection device of electronic spot welding machine |
| EP2042879A1 (en) * | 2007-09-28 | 2009-04-01 | MAGNETI MARELLI SISTEMI ELETTRONICI S.p.A. | Battery current sensor for a motor vehicle |
| CN201352234Y (en) * | 2009-05-18 | 2009-11-25 | 深圳市森晖电子有限公司 | Three-phase multifunctional electric energy meter |
| CN201464530U (en) * | 2009-01-14 | 2010-05-12 | 常州麦科卡电动车辆科技有限公司 | Current sensor |
| CN105334373A (en) * | 2015-11-29 | 2016-02-17 | 国网江西省电力科学研究院 | Small current sensor with piezoelectric/elastic-metal rectangular drum |
-
2016
- 2016-10-31 CN CN201610973276.7A patent/CN106526304A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001069269A2 (en) * | 2000-03-17 | 2001-09-20 | Sauer-Danfoss Holding A/S | Device for measuring an electric current that flows through a strip conductor |
| CN200996974Y (en) * | 2007-01-17 | 2007-12-26 | 梁柏青 | Welding current and voltage detection device of electronic spot welding machine |
| EP2042879A1 (en) * | 2007-09-28 | 2009-04-01 | MAGNETI MARELLI SISTEMI ELETTRONICI S.p.A. | Battery current sensor for a motor vehicle |
| CN201464530U (en) * | 2009-01-14 | 2010-05-12 | 常州麦科卡电动车辆科技有限公司 | Current sensor |
| CN201352234Y (en) * | 2009-05-18 | 2009-11-25 | 深圳市森晖电子有限公司 | Three-phase multifunctional electric energy meter |
| CN105334373A (en) * | 2015-11-29 | 2016-02-17 | 国网江西省电力科学研究院 | Small current sensor with piezoelectric/elastic-metal rectangular drum |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208715A (en) * | 2019-07-02 | 2019-09-06 | 上海禾他汽车科技有限公司 | A kind of method and automobile batteries management system measuring automobile batteries packet state of charge |
| CN113815439A (en) * | 2020-06-19 | 2021-12-21 | 安波福中央电气（上海）有限公司 | Onboard shunt current sensor in ICCPD (integrated circuit control power supply) of electric automobile |
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Application publication date: 20170322 |