CN106841734A - A kind of current sensor and electric current detecting method based on current divider - Google Patents
A kind of current sensor and electric current detecting method based on current divider Download PDFInfo
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- CN106841734A CN106841734A CN201611226939.5A CN201611226939A CN106841734A CN 106841734 A CN106841734 A CN 106841734A CN 201611226939 A CN201611226939 A CN 201611226939A CN 106841734 A CN106841734 A CN 106841734A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/08—Circuits for altering the measuring range
- G01R15/09—Autoranging circuits
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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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Abstract
The present invention is applied to current detecting, current sensor based on current divider is provided, including signal gathering unit, signal adjustment unit, signal conversion unit and signal processing unit, signal gathering unit includes current divider, for by the current divider collection voltages signal, and the voltage signal for gathering is sent to signal adjustment unit, signal adjustment unit is used to for the voltage signal to be adjusted to target simulation signal, and the target simulation signal is sent to signal conversion unit, after signal conversion unit is used to for the target simulation signal to be converted to digital voltage signal, it is sent to signal processing unit, signal processing unit, for being calculated according to the digital voltage signal, obtain flowing through the current signal of the current divider.By current divider collection voltages signal, and after voltage signal to collecting is adjusted, the current detecting that realization outranges, the current sensor provided using the present invention can realize the accurately measuring to low current to the embodiment of the present invention.
Description
Technical field
It is the invention belongs to field of sensing technologies more particularly to a kind of based on the current sensor of current divider and current detecting side
Method.
Background technology
Widely used Hall-type current sensor is because its principle is based on Hall effect (Hall on current electric automobile
Effect), it is necessary to the magnetic core made using high permeability material, and non-linear and hysteresis effect is the intrinsic of all high permeability materials
Characteristic, so output can obtain different results when electric current (primary side signal) is risen with same trend, declined.
For open loop type Hall current sensor, its work depends on the linearly interval of magnetic conduction magnetic core high, due to this biography
Magnetic flux at sensor direct measurement magnetic conduction magnetic core air gap high, therefore easily it is subject to magnetic core saturation, magnetic hysteresis, nonlinear influence, institute
It is relatively low with the precision of this open loop type Hall current sensor, and influenceed by hysteresis effect, it is impossible to measure too fast frequency
Electric current, Measurement bandwidth is narrower.
Closed loop Hall current sensor increased secondary compensative winding on the basis of open loop type current sensor, its survey
Accuracy of measurement has been lifted compared with open loop type Hall sensor, but due to increased secondary compensative winding and its corresponding control loop,
So that cost increases, volume increase, simultaneously because secondary compensative winding power output is limited, also occurs magnetic under special circumstances
The situation of core saturation, causes measuring error.
No matter open loop type Hall current sensor or closed loop Hall current sensor, in actual applications cannot be right
Low current carries out accurately measuring.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of current sensor and current detecting based on current divider
Method, it is intended to solve the problems, such as that prior art cannot carry out accurately measuring to low current.
The present invention is achieved in that a kind of current sensor based on current divider, including signal gathering unit, signal are adjusted
Whole unit, signal conversion unit and signal processing unit；
The signal gathering unit, including current divider, for by the current divider collection voltages signal, and will gather
The voltage signal is sent to the signal adjustment unit；
The signal adjustment unit, for the voltage signal to be adjusted into target simulation signal, and by the target mould
Intend signal and be sent to the signal conversion unit；
The signal conversion unit, after the target simulation signal is converted into digital voltage signal, is sent to institute
State signal processing unit；
The signal processing unit, for being calculated according to the digital voltage signal, obtains flowing through the current divider
Current signal.
Further, the signal adjustment unit includes signal gain module and signal biasing module；
The signal gain module, for the voltage signal to be amplified into preset gain signal；
The signal biasing module, for the preset gain signal to be biased, with the target mould after being biased
Intend signal.
Further, the signal gain module includes the first programmable gain amplifier, the signal biasing module bag
Include first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the first operational amplifier and the first power supply；
The first input end of first programmable gain amplifier connects the first output end of the signal sampling unit,
Second input of first programmable gain amplifier connects the second output end of the signal sampling unit, described first
First output end of programmable gain amplifier is connected to the anti-phase defeated of first operational amplifier by the first resistor
Enter end, the second output end of first programmable gain amplifier is connected to first computing and puts by the second resistance
The in-phase input end of big device；The first end of the 3rd resistor connects first power supply, and the second end of the 3rd resistor connects
Connect the in-phase input end of first operational amplifier；The first end of the 4th resistance connects first operational amplifier
In-phase input end, the second end ground connection of the 4th resistance；The first end of the 5th resistance connects first operation amplifier
The inverting input of device, the second end of the 5th resistance connects the output end of first operational amplifier；First fortune
The output end for calculating amplifier connects the signal conversion unit.
Further, the signal gain module includes the second programmable gain amplifier, the signal biasing module bag
Include the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11st resistance, the second operational amplifier, second
Power supply and the first electric capacity；
The first input end of second programmable gain amplifier connects the first output end of the signal sampling unit,
Second input of second programmable gain amplifier connects the second output end of the signal sampling unit, described second
First output end of programmable gain amplifier is connected to the anti-phase defeated of second operational amplifier by the 6th resistance
Enter end, the second output end of second programmable gain amplifier is connected to second computing and puts by the 7th resistance
The in-phase input end of big device；The first end of the 8th resistance connects the in-phase input end of second operational amplifier, described
The second end ground connection of the 8th resistance；The first end of the 9th resistance connects the inverting input of second operational amplifier,
Second end of the 9th resistance connects the output end of second operational amplifier；The first end connection institute of the tenth resistance
The output end of the second operational amplifier is stated, the second end of the tenth resistance connects the signal conversion unit；Described 11st
The first end of resistance connects the second source, and the second end of the 11st resistance connects the second end of the tenth resistance,
The first end of first electric capacity connects the second end of the 11st resistance, the second end ground connection of first electric capacity.
Further, the signal processing unit includes temperature compensation module and data processing module；
The temperature compensation module, the temperature information for gathering the current divider, and the temperature of the current divider is believed
Breath is sent to the data processing module；
The data processing module, for being calculated according to the temperature information and the digital voltage signal, is flowed through
The current signal of the current divider.
Further, the signal processing unit also includes：
Startup self-detection module, for after startup self-detection signal is detected, detecting the link information of the current divider, and presses
The link information is shown according to preset display mode；
Off-line monitoring module, for after off-line monitoring signal is detected, obtaining the current signal and connection letter
Cease and external monitoring systems will be sent to；
Temperature alarming module, the temperature information for detecting the current divider, and exceed preset temperature in the temperature information
During angle value, high temperature alarm signal is sent according to preset type of alarm；
Excessively stream alarm module, for when the current signal for flowing through the current divider is detected more than preset current value, pressing
Excessively stream alarm signal is sent according to preset type of alarm；
Self-defined detection module, for receiving self-defined detection instruction, according to the self-defined detection instruction to the electricity
Stream signal is detected.
Present invention also offers a kind of electric current detecting method, including：
The voltage signal at current divider two ends is obtained, the voltage signal at the current divider two ends is adjusted to target simulation letter
Number；
The target simulation signal is converted into digital voltage signal；
Calculated according to the digital voltage signal, obtained flowing through the current signal of the current divider.
Further, the voltage signal by the current divider two ends is adjusted to target simulation signal includes：
The both end voltage signal of the current divider is amplified to preset gain signal according to preset multiplication factor；
The preset gain signal is biased, to obtain preset target simulation signal.
Further, it is described to be calculated according to the digital voltage signal, obtain flowing through the electric current letter of the current divider
Number include：
Obtain the temperature information of the current divider；
Temperature information, the preset multiplication factor and the digital voltage signal according to the current divider are calculated,
Obtain flowing through the current signal of the current divider.
Further, the electric current detecting method also includes：
Detect the link information of the current divider；
After data call signal is detected, target data is sent to external monitoring systems, the target data includes
The current signal for flowing through the current divider, the temperature data, one or more of the link information of the current divider.
Compared with prior art, beneficial effect is the present invention：The embodiment of the present invention passes through current divider collection voltages signal,
And the voltage signal is adjusted and analog-to-digital conversion after calculate, obtain flowing through the current signal of the current divider.The present invention is implemented
Example by current divider collection voltages signal, and after voltage signal to collecting is adjusted, the current detecting that realization outranges,
The current sensor provided using the present invention, can realize the accurately measuring to low current.
Brief description of the drawings
Fig. 1 is a kind of reception schematic diagram of current sensor based on current divider provided in an embodiment of the present invention；
Fig. 2 is the structural representation of signal adjustment unit provided in an embodiment of the present invention；
Fig. 3 is the detailed construction schematic diagram of the signal adjustment unit that one embodiment of the invention is provided；
Fig. 4 is the detailed construction schematic diagram of the signal adjustment unit that another embodiment of the present invention is provided；
Fig. 5 is a kind of use schematic diagram of current sensor based on current divider provided in an embodiment of the present invention；
Fig. 6 is a kind of flow chart of electric current detecting method provided in an embodiment of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
At present, China's new-energy automobile industry is in the ascendant, for the traffic safety of support vehicles, electrokinetic cell system
The critical datas such as extreme monomer voltage, electrokinetic cell stagnation pressure, the size of current of electrokinetic cell are must real-time monitoring.For example move
The total current of power battery is predicted extremely for monitoring the running status of battery system with SOC (System On Chip, on-chip system)
Close important.Inventor has found, Hall current is widely used in current electric automobile industry and is sensed in the practice of the invention
Device is used as current monitoring device, but Hall current sensor has problems with：1. common open loop Hall current sensor is smart
Degree is relatively low, and temperature influence is larger, and the measurement reaction time is not fast enough, and frequency bandwidth is narrow；2. closed loop Hall current sensor is smart
Degree is high but expensive, and overload capacity is poor, and volume is larger, while needing calibration using the later stage；3. Hall current sensor volume
Greatly, inconvenience is installed, the requirement of current small size lightweight development is not met；4. either closed loop Hall current sensor is still
Open loop type Hall current sensor measures low current under the conditions of wide range and larger error occurs, low current collection is inaccurate
Really；5. Hall current sensor can not play normal measurement effect after there is magnetic saturation, while easily causing sensor to damage
It is bad；6. the complicated electromagnetic environment of electric automobile easily disturbs the simulation output of Hall current sensor, and then influences current measurement
Precision.
Regarding to the issue above, present inventor provides a kind of high-precision current sensor based on current divider, the electricity
The operation principle of flow sensor is based on not existing nonlinear device, according to lumped-circuit characteristic, the electricity in Ohm's law, and circuit
The Measurement bandwidth of the electric current of flow sensor can do very wide, can measure rapidly alternating current；Linear unit does not exist back simultaneously
Difference and hysteresis, therefore calibration avoids the need for calibrating again after completing for the first time；There is no magnet ring, therefore whole current sensor can
It is very small with what is done, save Main Control Tank space；Using numeral output, the complicated electromagnetic environment of electric automobile is prevented effectively to electric current
The interference of sensor；There is automatic gain control function with circuit inside, ensure that sensor in different current ranges
Inside possesses highest current measurement precision all the time；With outranging current measuring capabilities.
Based on above-mentioned invention thinking, the invention provides a kind of current sensor based on current divider as shown in Figure 1,
Including signal gathering unit 101, signal adjustment unit 102, signal conversion unit 103 and signal processing unit 104；
Signal gathering unit 103, including current divider, for by the current divider collection voltages signal, and will gather
The voltage signal is sent to signal adjustment unit 102；
Signal adjustment unit 102, for the voltage signal to be adjusted into target simulation signal, and by the target simulation
Signal is sent to signal conversion unit 103.
Specifically, as shown in Fig. 2 signal adjustment unit 102 includes signal gain module 1021 and signal biasing module
1022, signal gain module 1021 is used to for the voltage signal to be amplified to preset gain signal, and signal biasing module 1022 is used
In after the preset gain signal for receiving the transmission of signal gain module 1021, the preset gain signal is biased, with
Target simulation signal after to biasing.
Signal conversion unit 103, after the target simulation signal is converted into digital voltage signal, is sent to signal
Processing unit 104；
Signal processing unit 14, for being calculated according to the digital voltage signal, obtains flowing through the current divider
Current signal.
The embodiment of the present invention is further explained with reference to Fig. 3 and Fig. 4：
As shown in figure 3, signal gain module 1021 includes the first programmable gain amplifier PGA1, signal biasing module
1022 include first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the first operational amplifier
E1 and the first power supply VCC1；The of the first input end connection signal sampling unit 101 of the first programmable gain amplifier PGA1
One output end, the second output end of the second input connection signal sampling unit 101 of the first programmable gain amplifier PGA1,
First output end of the first programmable gain amplifier PGA1 is connected to the anti-of the first operational amplifier E1 by first resistor R1
Phase input, second output end of the first programmable gain amplifier PGA1 is connected to the first operation amplifier by second resistance R2
The in-phase input end of device PGA1；The first end of 3rd resistor R3 connects the first power supply VCC1, the second end connection of 3rd resistor R3
The in-phase input end of the first operational amplifier E1；The first end of the 4th resistance R4 connects the homophase input of the first operational amplifier E1
End, the second end ground connection of the 4th resistance R4；5th resistance R5 is connected to inverting input and the output of the first operational amplifier E1
Between end；The output end connection signal conversion unit 103 of the first operational amplifier E1.
Fig. 4 also show another specific embodiment of signal adjustment unit 102, and signal gain module 1021 includes
Second programmable gain amplifier PGA2, signal biasing module 1022 includes the 6th resistance R6, the 7th resistance R7, the 8th resistance
R8, the 9th resistance R9, the tenth resistance R10, the 11st resistance R11, the second operational amplifier E2, the electricity of second source VCC2 and first
Hold C1；First output end of the first input end connection signal sampling unit 101 of the second programmable gain amplifier PGA2, second
Second output end of the second input connection signal sampling unit 101 of programmable gain amplifier PGA2, the second programmable increasing
First output end of beneficial amplifier PGA2 is connected to the inverting input of the second operational amplifier E2, second by the 6th resistance R6
Second output end of programmable gain amplifier PGA2 is connected to the same mutually defeated of the second operational amplifier E2 by the 7th resistance R7
Enter end；The first end of the 8th resistance R8 connects the in-phase input end of the second operational amplifier E2, second termination of the 8th resistance R8
Ground；9th resistance is connected and the inverting input and output end of the second operational amplifier E2 between；The first end of the tenth resistance R10
Connect the output end of the second operational amplifier E2, the second end connection signal conversion unit 103 of the tenth resistance R10；11st electricity
The second end for hindering first end connection the second source CC2, the 11st resistance R11 of R11 connects second end of the tenth resistance R10, the
The first end of one electric capacity C1 connects second end of the tenth resistance R10, the second end ground connection of the first electric capacity C1.
Further, signal processing unit 104 includes temperature compensation module 1041 and data processing module 1042；
Temperature compensation module 1041, the temperature information for gathering the current divider, and the temperature of the current divider is believed
Breath is sent to data processing module 1042；
Data processing module 1042, for being calculated according to the temperature information and the digital voltage signal, is flowed through
The current signal of the current divider.
Startup self-detection module 1043, for after startup self-detection signal is detected, detecting the link information of the current divider,
And show the link information according to preset display mode.In the present embodiment, user is opening the electric current that the present embodiment is provided
Be connected to current sensor in detection circuit by sensor device, and current sensor will boot up self-inspection, start detection point
The connection and other information of device are flowed, and link information is shown with preset display mode, preset display mode is included using not
With the light flash of color to indicate different connections, also including saying that it is outer that the connection of the current divider for detecting is sent to
Portion's monitoring system, to facilitate monitoring personnel to know the connection of current divider, specifically, ought such as detect current divider and not connect,
Then startup self-detection 1043 will flash feux rouges to carry out light warning, and the connection of current divider is passed by wireless transmission protocol
External monitoring systems are defeated by, monitoring personnel can be further processed according to the connection of the current divider.
Off-line monitoring module 1044, for after off-line monitoring signal is detected, obtaining the current signal and the company
Connect information and external monitoring systems will be sent to.In the present embodiment, external monitoring systems send to off-line monitoring module 1044
Offline inspection signal, after off-line monitoring module 1044 receives the offline inspection signal, will obtain current flow sensor meter
The current signal of calculation and the link information of current divider are simultaneously sent to external monitoring systems.It should be appreciated that offline when detecting
After detection signal, if current divider is not connected, and when causing the data processing module 1042 cannot to calculate current signal, offline prison
Surveying module 1044 will individually send the connection signal of current divider to external monitoring systems, likewise, during concrete application, from
The link information of current signal and current divider can be sent to external monitoring systems by line detection module 1044 in real time, be not limited to
Just started working after offline inspection signal is received, meanwhile, the information that monitored off-line module 1044 sends also not only is limited to
In current information and the link information of current divider, other information can also be obtained according to the instruction of other in offline inspection signal,
It is not limited herein.
Temperature alarming module 1045, the temperature information for detecting the current divider, and exceed in the temperature information pre-
When putting temperature value, high temperature alarm signal is sent according to preset type of alarm.
Excessively stream alarm module 1046, the current signal for flowing through the current divider is detected more than preset current value for working as
When, send excessively stream alarm signal according to preset type of alarm.In the present embodiment, when detecting the current signal that flows through current divider
During more than preset current value, excessively stream alarm module 1046 will send excessively stream alarm signal, and excessively stream alarm signal can be according to reality
Situation is configured, and such as sends light flash, buzzing and reminds, or generation excessively stream alarm signal is sent to external monitoring systems,
So that external monitoring systems can
Self-defined detection module 1047, for receiving self-defined detection instruction, according to the self-defined detection instruction to institute
Current signal is stated to be detected.In the present embodiment, custom block 1047 is used to receive the self-defined detection instruction of user, should
Self-defined detection instruction is used for the offer function of the current sensor for expanding the present embodiment offer.
The operation principle of the current sensor for providing the present embodiment below is further illustrated：
As shown in figure 5, operationally, it is necessary to by the present embodiment provide current sensor be arranged on power loop in, together
When the digital output end of current sensor that the present embodiment is provided is connected to current information receiving terminal, the current information receiving terminal
Including the intelligent terminal such as mobile phone, flat board, or computer, configuration display screen, BMS systems etc., by above-mentioned installation, you can complete
The collection of electric current and its relevant information.
The Part I of the current sensor that the present embodiment is provided is the adjustment of the collection with voltage signal of voltage signal, main
Will in order to realize by separator gather voltage signal gain-adjusted and bias-adjusted.After electric current is by current divider, root
Voltage will be produced according to Ohm's law current divider two ends, it is assumed that current divider resistance value is R, electric current now is I, it is assumed that now electric current
Forward direction, current divider both end voltage is also for just, then the voltage U at current divider two endsiFor：Ui=IR；When the current flow is reversed, current divider
The voltage at two ends will be negative value, i.e.,：-Ui=-IR.In a particular application, in order to take into account the problem of power consumption, the resistance of current divider is equal
It is designed to very small, when electric current is flowed through, the voltage at current divider two ends also will be very small, when the current flow is reversed, current divider two ends
Voltage also will be reverse, as negative value；Acquisition process for the ease of low current is, it is necessary to the voltage amplification at current divider two ends is arrived
Suitable voltage range, while whole output voltage is raised into more than 0V using biasing circuit.Assuming that current divider resistance is
0.1m Ω, the current divider range of design is ± 500A, and when the current value for flowing through current divider, for i, (i can also may be used more than ± 500A
With less than or equal to ± 500A) when, then the voltage signal of current divider output is (i × 10-4) mV, the voltage signal is amplified A times, together
When apply 2.5V voltage bias, it is possible to the voltage signal of the current divider that will be collected is transformed into closest to signal conversion unit
103 preset voltage scope, to obtain optimal acquisition precision.Due to not knowing for current value i, so needing corresponding amplification
Multiple A is not known yet, therefore a programmable gain amplifier (Pmgrammable Gain is increased in the present embodiment
Amplifier, PGA), multiplication factor A is dynamically changed by program, to ensure when arbitrary electric current i flows through current divider,
The voltage signal for collecting is in more than 0V by after signal adjustment unit 102, can guarantee that final output signal all the time, and
Amplitude is suitable so as to the sample effect being optimal.
Preferably, the programmable gain amplifier that signal gain module 1021 is used can use the collection of model PGA281
Gain-adjusted is realized into PGA, signal biasing module 1022 can be using by the circuit realiration voltage bias in Fig. 3 or Fig. 4.
In Fig. 3, voltage bias are realized using difference add circuit, wherein, the first power supply VCC1 is bias voltage, magnitude of voltage
It is 2.5V, then in figure 3, circuit transitive relation is：
In specific practical application, to realize 1:1 gain, the resistance of the resistance R9 of first resistor R1 to the 9th is consistent,
Therefore in above-mentioned formula, Vout is the output voltage of signal adjustment unit 102, VoutnIt is the first programmable gain amplifier
PGA1 is the output voltage of the first output end, VoutpFor the first programmable gain amplifier PGA1 is the output of the second output end
Voltage, the R1 and R1 in denominator in molecule is same variable.
Fig. 4 shows that another realizes the circuit of voltage bias, wherein, the output voltage of second source VCC2 is Vcc, the
The resistance of ten resistance R10 is 10K Ω for the resistance of 10K Ω, the 11st resistance R11, and the circuit transitive relation of the circuit is：
In above-mentioned formula, Vout is the output voltage of signal adjustment unit 102, Voutn' it is the second programmable automation controller
Device PGA2 is the output voltage of the first output end, Voutp' it is that the second programmable gain amplifier PGA2 is the defeated of the second output end
Go out voltage.
It should be noted that first output end of the first programmable gain amplifier PGA1 in Fig. 3 is Voutn, second
Output end is Voutp, the gain G ain=A that the first programmable gain amplifier PGA1 is set；The second programmable-gain is put in Fig. 4
First output end of big device PGA2 is Voutn', the second output end is Voutp', what the second programmable gain amplifier PGA2 was set
Gain G ain=A ', and as second source VCC2=5V, there is the relation of A '=2A in the gain in Fig. 3 and Fig. 4.Due to Fig. 3
Identical voltage bias function can be realized with Fig. 4, so in the circuit without particular demands, Fig. 3 or Fig. 4 is equal for selection
Can.But when having high requirements to whole circuit precision, or when exigent to bias voltage, selection Fig. 3 can more expire
The high-precision requirement of foot, 2.5V bias voltages therein can be produced using the voltage-reference of High Precision Low Temperature drift, for example
REF3025；When not high to circuit required precision, or when more sensitive to cost requirement, or late-class circuit is hindered output
It is anti-when do not require, it is possible to use Fig. 4 realizes voltage bias.
The Part II of the embodiment of the present invention is analog to digital conversion circuit, i.e. signal conversion unit 103.Signal conversion unit
Analog voltage signal, by digital-to-analogue conversion, is converted into numeral by 103 by by the output voltage after amplitude adjusted with biasing first
Amount, in order to signal processing unit processes data below.
The Part III of the embodiment of the present invention is signal processing unit 104, and the part is used to adopt comprising temperature collection circuit
Collect the temperature data of current divider, because current divider is linear unit, its resistance variation with temperature is predictable and is to determine
, the built-in algorithm according to signal processing unit carries out temperature-compensating to the signal that collection is returned, and combines the PGA increasings for setting
Benefit value, anti-plug-flow obtains revised final current data through the size of the current signal of current divider.Further, signal
Processing unit 104 can also realize startup self-detection, off-line monitoring, temperature alarming, the excessively stream alarm of current sensor by software
Deng the function of application, it is also possible to by user's spread correlation function.Current data that current sensor measurement is arrived and
Relevant information is transmitted to the host computer of current detecting, such as entire car controller, BMS by digital communi- cations link.
Present invention also offers a kind of electric current detecting method as shown in Figure 6, including：
S601, obtains the voltage signal at current divider two ends, and the voltage signal at the current divider two ends is adjusted into target mould
Intend signal；
S602, digital voltage signal is converted to by the target simulation signal；
S603, is calculated according to the digital voltage signal, obtains flowing through the current signal of the current divider.
Further, the voltage signal by the current divider two ends is adjusted to target simulation signal includes：
The both end voltage signal of the current divider is amplified to preset gain signal according to preset multiplication factor；
The preset gain signal is biased, to obtain preset target simulation signal.
Further, it is described to be calculated according to the digital voltage signal, obtain flowing through the electric current letter of the current divider
Number include：
Obtain the temperature information of the current divider；
Temperature information, the preset multiplication factor and the digital voltage signal according to the current divider are calculated,
Obtain flowing through the current signal of the current divider.
Further, the electric current detecting method also includes：
Detect the link information of the current divider；
After data call signal is detected, target data is sent to external monitoring systems, the target data includes
The current signal for flowing through the current divider, the temperature data, one or more of the link information of the current divider.
Current sensor provided in an embodiment of the present invention all has precision very high in the range of each current range, and
And with electric current it is smaller more accurate the characteristics of, possess and outrange current acquisition ability；Current sensor inside has temperature correction
Circuit, that is, use temperature compensation module to realize the function of temperature correction, while there is digital interface, strong antijamming capability.Can
To realize the extension of function by the software section inside sensors configured, such as electric current/temperature threshold alarm, offline alarm etc.
Function.The embodiment of the present invention is together processed counter push away etc. of the collection of current divider signal, treatment, compensation, electric current using discrete device,
So that shunt portion turns into a complete module, after PGA so that the precision of current divider is greatly carried
Height, and can realize outranging current acquisition.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of current sensor based on current divider, it is characterised in that the current sensor includes signal gathering unit, letter
Number adjustment unit, signal conversion unit and signal processing unit；
The signal gathering unit, including current divider, for by the current divider collection voltages signal, and will be described in collection
Voltage signal is sent to the signal adjustment unit；
The signal adjustment unit, for the voltage signal to be adjusted into target simulation signal, and the target simulation is believed
Number it is sent to the signal conversion unit；
The signal conversion unit, after the target simulation signal is converted into digital voltage signal, is sent to the letter
Number processing unit；
The signal processing unit, for being calculated according to the digital voltage signal, obtains flowing through the electricity of the current divider
Stream signal.
2. current sensor as claimed in claim 1, it is characterised in that the signal adjustment unit includes signal gain module
With signal biasing module；
The signal gain module, for the voltage signal to be amplified into preset gain signal；
The signal biasing module, for the preset gain signal to be biased, is believed with the target simulation after being biased
Number.
3. current sensor as claimed in claim 2, it is characterised in that the signal gain module includes that first programmable increases
Beneficial amplifier, the signal biasing module includes first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the
One operational amplifier and the first power supply；
The first input end of first programmable gain amplifier connects the first output end of the signal sampling unit, described
Second input of the first programmable gain amplifier connects the second output end of the signal sampling unit, and described first can compile
First output end of journey gain amplifier is connected to the inverting input of first operational amplifier by the first resistor,
Second output end of first programmable gain amplifier is connected to first operational amplifier by the second resistance
In-phase input end；The first end of the 3rd resistor connects first power supply, the second end connection institute of the 3rd resistor
State the in-phase input end of the first operational amplifier；The first end of the 4th resistance connects the same phase of first operational amplifier
Input, the second end ground connection of the 4th resistance；5th resistance is connected to the anti-phase defeated of first operational amplifier
Enter between end and output end；The output end of first operational amplifier connects the signal conversion unit.
4. current sensor as claimed in claim 2, it is characterised in that the signal gain module includes that second programmable increases
Beneficial amplifier, the signal biasing module includes the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the
11 resistance, the second operational amplifier, second source and the first electric capacity；
The first input end of second programmable gain amplifier connects the first output end of the signal sampling unit, described
Second input of the second programmable gain amplifier connects the second output end of the signal sampling unit, and described second can compile
First output end of journey gain amplifier is connected to the inverting input of second operational amplifier by the 6th resistance,
Second output end of second programmable gain amplifier is connected to second operational amplifier by the 7th resistance
In-phase input end；The first end of the 8th resistance connects the in-phase input end of second operational amplifier, the described 8th
The second end ground connection of resistance；9th resistance be connected to second operational amplifier inverting input and output end it
Between；The first end of the tenth resistance connects the output end of second operational amplifier, and the second end of the tenth resistance connects
Connect the signal conversion unit；The first end of the 11st resistance connects the second source, and the of the 11st resistance
Two ends connect the second end of the tenth resistance, and the first end of first electric capacity connects the second end of the tenth resistance, institute
State the second end ground connection of the first electric capacity.
5. the current sensor as described in any one of Claims 1-4, it is characterised in that the signal processing unit includes temperature
Degree compensating module and data processing module；
The temperature compensation module, the temperature information for gathering the current divider, and the temperature information of the current divider is sent out
Give the data processing module；
The data processing module, for being calculated according to the temperature information and the digital voltage signal, obtains flowing through described
The current signal of current divider.
6. current sensor as claimed in claim 5, it is characterised in that the signal processing unit also includes：
Startup self-detection module, for after startup self-detection signal is detected, detecting the link information of the current divider, and according to pre-
Put display mode and show the link information；
Off-line monitoring module, for after off-line monitoring signal is detected, obtaining the current signal and the link information simultaneously
External monitoring systems will be sent to；
Temperature alarming module, the temperature information for detecting the current divider, and exceed preset temperature value in the temperature information
When, send high temperature alarm signal according to preset type of alarm；
Excessively stream alarm module, for when the current signal for flowing through the current divider is detected more than preset current value, according to pre-
Put type of alarm and send excessively stream alarm signal；
Self-defined detection module, for receiving self-defined detection instruction, believes the electric current according to the self-defined detection instruction
Number detected.
7. a kind of electric current detecting method, it is characterised in that including：
The voltage signal at current divider two ends is obtained, the voltage signal at the current divider two ends is adjusted to target simulation signal；
The target simulation signal is converted into digital voltage signal；
Calculated according to the digital voltage signal, obtained flowing through the current signal of the current divider.
8. electric current detecting method as claimed in claim 7, it is characterised in that the voltage signal by the current divider two ends
Being adjusted to target simulation signal includes：
The both end voltage signal of the current divider is amplified to preset gain signal according to preset multiplication factor；
The preset gain signal is biased, to obtain preset target simulation signal.
9. electric current detecting method as claimed in claim 8, it is characterised in that described to be counted according to the digital voltage signal
Calculate, the current signal for obtaining flowing through the current divider includes：
Obtain the temperature information of the current divider；
Temperature information, the preset multiplication factor and the digital voltage signal according to the current divider are calculated, and are obtained
Flow through the current signal of the current divider.
10. electric current detecting method as claimed in claim 9, it is characterised in that the electric current detecting method also includes：
Detect the link information of the current divider；
After data call signal is detected, target data is sent to external monitoring systems, the target data includes described
Flow through the current signal of the current divider, the temperature data, one or more of the link information of the current divider.
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| CN201611226939.5A CN106841734A (en) | 2016-12-27 | 2016-12-27 | A kind of current sensor and electric current detecting method based on current divider |
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| CN107505483A (en) * | 2017-10-13 | 2017-12-22 | 沃尔特电子（苏州）有限公司 | A kind of high current, voltage monitor and method |
| CN108226624A (en) * | 2018-01-11 | 2018-06-29 | 江西联智集成电路有限公司 | Current sensor and electric current inducing method |
| CN109490615A (en) * | 2018-12-20 | 2019-03-19 | 中国航空工业集团公司西安飞机设计研究所 | The monitoring method and current collecting device of a kind of pair of airborne equipment electric current |
| CN109633255A (en) * | 2019-01-25 | 2019-04-16 | 常州索维尔电子科技有限公司 | Current measuring device and current measuring method based on current divider |
| CN109884377A (en) * | 2019-03-05 | 2019-06-14 | 常州索维尔电子科技有限公司 | The hall signal measuring device and method of detection range automatic adjustment |
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| CN112649661A (en) * | 2020-12-30 | 2021-04-13 | 无锡市同飞科技有限公司 | Current detection circuit based on Hall sensor |
| CN112688687A (en) * | 2020-12-09 | 2021-04-20 | 南方电网数字电网研究院有限公司 | Method and device for acquiring physical information to be tested, computer equipment and storage medium |
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| CN114002482A (en) * | 2021-12-24 | 2022-02-01 | 深圳市永联科技股份有限公司 | Equipment current detection method and electronic equipment |
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