CN205941835U - Current detection circuit and signal processing module thereof - Google Patents
Current detection circuit and signal processing module thereof Download PDFInfo
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- CN205941835U CN205941835U CN201620874777.5U CN201620874777U CN205941835U CN 205941835 U CN205941835 U CN 205941835U CN 201620874777 U CN201620874777 U CN 201620874777U CN 205941835 U CN205941835 U CN 205941835U
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- 238000012545 processing Methods 0.000 title claims abstract description 40
- 238000001514 detection method Methods 0.000 title claims abstract description 13
- 238000002955 isolation Methods 0.000 claims abstract description 10
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 239000011324 bead Substances 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 6
- 238000004088 simulation Methods 0.000 claims description 4
- 230000003139 buffering effect Effects 0.000 claims description 2
- 230000007704 transition Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 101100328957 Caenorhabditis elegans clk-1 gene Proteins 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 102100036285 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Human genes 0.000 description 1
- 102100040844 Dual specificity protein kinase CLK2 Human genes 0.000 description 1
- 101000875403 Homo sapiens 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Proteins 0.000 description 1
- 101000749291 Homo sapiens Dual specificity protein kinase CLK2 Proteins 0.000 description 1
- 101100489713 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND1 gene Proteins 0.000 description 1
- 101100489717 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND2 gene Proteins 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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Abstract
The utility model provides a signal processing module, signal processing module includes signal receiving unit, signal coding unit and keeps apart the unit. Signal receiving unit is to receive first and the 2nd analog signal amplifies, biasing and filtering are handled in order generating the 3rd analog signal, and will the 3rd analog signal export for signal coding unit. Signal coding unit will the 3rd analog signal transition becomes a frequency signal, and will a frequency signal export for keep apart the unit. It is right to keep apart the unit a frequency signal carries out the electric isolation in order generating the 2nd frequency signal, and output the second frequency signal. The utility model provides an use signal processing module's current detection circuit. Above -mentioned current detection circuit and signal processing module thereof can improve current sensor output signal's accuracy.
Description
【Technical field】
The present invention relates to testing circuit technical field, more particularly, to a kind of current detecting electricity with signal processing module
Road.
【Background technology】
New-energy automobile quickly grows in recent years, for BMS (Battery Management System, battery management system
System) requirement also increasingly harsher, as a part requisite in BMS, it does not say current detecting to the importance of BMS
And explain.Current sensor is usually used in BMS to detect electric current, the precision of current sensor output is directly connected to electronic
The estimation precision of automobile SOC (State of Charge, dump energy).If the precision of current sensor output is not,
SOC calculating error will be led to larger, or even vehicle launch software protection strategy can be triggered because current measurement is forbidden.
【Content of the invention】
In view of the foregoing it is necessary to provide a kind of signal processing mould that can improve current sensor output degree of accuracy
Block.
There is a need to and a kind of current detection circuit applying described signal processing module is provided.
To achieve these goals, the present invention provides a kind of signal processing module, and described signal processing module includes signal
Receiving unit, Signal coding unit and isolated location, described signal receiving unit enters to first and second analogue signal receiving
Row amplifies, biasing and Filtering Processing are to generate the 3rd analogue signal, and described 3rd analog signal output compiles to described signal
Code unit, described 3rd analogue signal is converted into first frequency signal by described Signal coding unit, and by described first frequency
Signal output gives described isolated location, and described isolated location carries out electrical isolation to generate the second frequency to described first frequency signal
Rate signal, and export described second frequency signal.
The present invention also provides a kind of current detection circuit, and described current detection circuit includes current sensor, as mentioned above
Signal processing module and control module, described current sensor is by described signal processing module and described control module phase
Even, described signal processing module is processed to first and second analogue signal that described current sensor exports, and will process
Signal output afterwards gives described control module.
The simulation by described signal processing module, described current sensor being sensed compared to prior art, the present invention
Signal be converted into high-low pressure survey electrical isolation frequency signal, with improve described current sensor output stability,
Capacity of resisting disturbance and degree of accuracy, so that the phase of described electrokinetic cell that described control module goes out according to the signal of change receiving
The degree of accuracy of related parameter (SOC as electrokinetic cell etc.) is higher.
【Brief description】
The theory diagram of the current detection circuit that Fig. 1 provides for embodiment of the present invention.
Fig. 2 is the circuit diagram of signal processing module in Fig. 1.
【Specific embodiment】
In order that the purpose of the present invention, technical scheme and Advantageous Effects become apparent from understanding, below in conjunction with this
Accompanying drawing in bright embodiment, is clearly and completely described it is clear that being retouched to the technical scheme in embodiment of the present invention
The embodiment stated is only a part of embodiment of the present invention, rather than whole embodiments.Based on the reality in the present invention
Apply mode, the every other embodiment that those of ordinary skill in the art are obtained under the premise of not making creative work,
Broadly fall into the scope of protection of the invention.
When an element was considered with another element " being connected ", it can be directly to another element or
May be simultaneously present centering elements.Unless otherwise defined, all of technology used herein and scientific terminology with belong to this
The implication that bright those skilled in the art are generally understood that is identical.The term being used in the description of the invention herein
Be intended merely to describe specific embodiment purpose it is not intended that in limit the present invention.
Refer to Fig. 1, the theory diagram of the current detection circuit 10 that Fig. 1 provides for embodiments of the present invention.Described electricity
Current detection circuit 10 includes current sensor 12, signal processing module 16 and control module 18.Described current sensor 12 passes through
Described signal processing module 16 is connected with described control module 18.Described current sensor 12 is used for sensing the electricity of Devices to test
Stream, and the signal output sensing is given described signal processing module 16.Described signal processing module 16 is used for receiving
Signal is processed, and by the signal output after processing to described control module 18.Described control module 18 is according to receiving
The relevant parameter of Devices to test described in signal of change.
In the present embodiment, described current sensor 12 includes diverter 126, and described control module 18 includes MCU
(Microcontroller Unit, micro-control unit) 186；Described Devices to test is the electrokinetic cell of new-energy automobile, described
The signal that current sensor 12 senses includes the first analogue signal SHUNT+ and the second analogue signal SHUNT-, described control mould
The relevant parameter of block 18 electrokinetic cell according to the signal of change receiving, such as SOC (the State of of electrokinetic cell
Charge, dump energy) etc..In other embodiments, described Devices to test can be miscellaneous equipment or unit according to practical situation
Part.
Described signal processing module 16 includes signal receiving unit 162, Signal coding unit 166 and isolated location 168.Institute
State signal receiving unit 162 to be connected with described current sensor 12, and single with described isolation by described Signal coding unit 166
Unit 168 is connected.Described isolated location 168 is connected with described control module 18.Described signal receiving unit 162 receives described electricity
Described first analogue signal SHUNT+ of stream sensor 12 output and described second analogue signal SHUNT-, and to described in reception
First analogue signal SHUNT+ and described second analogue signal SHUNT- be amplified, bias and Filtering Processing is to generate the 3rd mould
Intend signal V_SHUNT, and described 3rd analogue signal V_SHUNT is exported to described Signal coding unit 166.Described signal is compiled
Described 3rd analogue signal V_SHUNT is converted into first frequency signal F1 by code unit 166, and by described first frequency signal F1
Export to described isolated location 168.Described isolated location 168 carries out electrical isolation to generate to described first frequency signal F1
Two frequency signal F2, and described second frequency signal F2 is exported to described control module 18.
Refer to Fig. 2, the circuit diagram of the described signal processing module 16 that Fig. 2 provides for embodiments of the present invention.Described
Signal receiving unit 162 includes comparator U1, electric capacity C1 and first to fourth resistance R1-R4.The homophase of described comparator U1 is defeated
Enter end+by described first resistor R1 reception described first analogue signal SHUNT+, and by described first resistor R1 with described
The first end of electric capacity C1 is connected, and receives reference signal V_REF also by described second resistance R2.Described comparator U1's is anti-phase defeated
Enter end-by described 3rd resistor R3 reception described second analogue signal SHUNT-, and by described 3rd resistor R3 with described
Second end of electric capacity C1 is connected, and is connected with the outfan of described comparator U1 also by described 4th resistance R4.Described comparator
The outfan of U1 is connected with described Signal coding unit 166, is compiled to described signal with exporting described 3rd analogue signal V_SHUNT
Code unit 166.
Described signal receiving unit 162 also includes the 5th to the 8th resistance R5-R8.The in-phase input end of described comparator U1
+ receive described first analogue signal SHUNT+ also by described 5th resistance R5, and received described by described 6th resistance R6
Reference signal V_REF.The inverting input of described comparator U1-receive described second simulation letter also by described 7th resistance R7
Number SHUNT-, and be connected with the outfan of described comparator U1 by described 8th resistance R8.
Described signal receiving unit 162 also includes the first magnetic bead L1 and the second magnetic bead L2.The power end of described comparator U1
VCC is connected with the first power supply V1 by described first magnetic bead L1.The earth terminal GND of described comparator U1 passes through described second magnetic bead
L2 is connected with second source V2.In the present embodiment, described first magnetic bead L1 and described second magnetic bead L2 has logical high frequency, resistance
The function of low frequency, so as to play the effect of filtering to described first power supply V1 and described second source V2.
Described Signal coding unit 166 includes voltage to frequency converter U2.The input of described voltage to frequency converter U2 is drawn
Foot VIN is connected with described signal receiving unit 162, to receive described 3rd analogue signal V_SHUNT.Described voltage to frequency convert
The output pin FO of device U2 is connected with described isolated location 168, to export described first frequency signal F1 to described isolated location
168.
Described Signal coding unit 166 also includes the 9th to the 11st resistance R9-R11.Described voltage to frequency converter U2
Input pin VIN be connected with described signal receiving unit 162 by described 9th resistance R9.Described voltage to frequency converter U2
Buffering pin BUF be connected with described first power supply V1 by described tenth resistance R10, and by the 11st resistance R11 ground connection.
Power pins VDD of described voltage to frequency converter U2 are connected with described first power supply V1.Described voltage to frequency converter U2's
Low reference pin REF is connected with described first power supply V1.The clock pins CLKI of described voltage to frequency converter U2 and described isolation
Unit 168 is connected, to receive the first clock signal clk 1 of described isolated location 168 output.Described voltage to frequency converter U2
Grounding pin GND ground connection.
Described isolated location 168 includes isolator U3.The first input pin A1 of described isolator U3 and described voltage frequency
The output pin FO of rate converter U2 is connected, to receive described first frequency signal F1.First output of described isolator U3 is drawn
Foot B1 is connected with the relevant pins (such as having the pin of intervalometer input characteristics) of the MCU 186 of described control module 18, with defeated
Go out the relevant pins of the MCU 186 to described control module 18 for the described second frequency signal F2.
The second input pin B2 of described isolator U3 receives second clock signal CLK2.The second of described isolator U3 is defeated
The clock pins CLKI going out pin A2 with described voltage to frequency converter U2 is connected, with export described first clock signal clk 1 to
The clock pins CLKI of described voltage to frequency converter U2.First power pins VDD1 of described isolator U3 and described first electricity
Source V1 is connected, and the second source pin VDD2 of described isolator U3 is connected with the 3rd power supply V3, and the first of described isolator U3 connects
Ground pin GND1 and the second grounding pin GND2 is all grounded.
Below the operation principle of the current detection circuit 10 that first embodiment of the invention is provided is illustrated.
During work, described current sensor 12 senses the electric current of electrokinetic cell, and will sense described first analogue signal
SHUNT+ and described second analogue signal SHUNT- export to described signal receiving unit 162.Described signal receiving unit 162 connects
Receive described first analogue signal SHUNT+ of described current sensor 12 output and described second analogue signal SHUNT-, and dock
Described first analogue signal SHUNT+ received and described second analogue signal SHUNT- are amplified, bias and Filtering Processing is with life
Become the 3rd analogue signal V_SHUNT, and described 3rd analogue signal V_SHUNT is exported to described Signal coding unit 166.Institute
State Signal coding unit 166 and described 3rd analogue signal V_SHUNT is converted into first frequency signal F1, and by described first frequently
Rate signal F1 exports to described isolated location 168.Described isolated location 168 carries out electrical isolation to described first frequency signal F1
To generate second frequency signal F2, and described second frequency signal F2 is exported to the MCU 186 of described control module 18.Described
The MCU 186 of control module 18 calculates the relevant parameter of described electrokinetic cell according to the described second frequency signal F2 receiving,
SOC as electrokinetic cell etc..
In the present embodiment, described 3rd analogue signal of sign that the frequency of described first frequency signal F1 can be linear
The magnitude of voltage of V_SHUNT, that is, described first frequency signal F1 can characterize the raw voltage signals of diverter.Described second frequency
Rate signal F2 is equal with the frequency of described first frequency signal F1, and described second frequency signal F2 has been carried out high-low pressure survey
Electrical isolation.It is appreciated that compared to analogue signal and digital signal, described first frequency signal F1 and described second frequency are believed
Number F1 is more stable, capacity of resisting disturbance is higher and degree of accuracy is higher.
The analogue signal that described current sensor 12 senses is converted into by the present invention by described signal processing module 16
The frequency signal of the electrical isolation that high-low pressure is surveyed, to improve the stability of described current sensor 12 output signal, anti-interference energy
Power and degree of accuracy, so that the relevant parameter of described electrokinetic cell that described control module 18 goes out according to the signal of change receiving
The degree of accuracy of (SOC as electrokinetic cell etc.) is higher.
The present invention is not restricted to described in description and embodiment, therefore for the personnel of familiar field
It is easily achieved additional advantage and modification, therefore the essence in the general concept being limited without departing substantially from claim and equivalency range
God and scope in the case of, the present invention be not limited to specific details, representational equipment and shown here as with description diagram
Example.
Claims (10)
1. a kind of signal processing module, including signal receiving unit, Signal coding unit and isolated location, described signal receives single
Unit is amplified, biases and Filtering Processing is to generate the 3rd analogue signal to first and second analogue signal receiving, and by institute
State the 3rd analog signal output to described Signal coding unit, described 3rd analogue signal is converted into by described Signal coding unit
First frequency signal, and described first frequency signal output is given described isolated location, described isolated location is to the described first frequency
Rate signal carries out electrical isolation to generate second frequency signal, and exports described second frequency signal.
2. signal processing module as claimed in claim 1 it is characterised in that：Described signal receiving unit includes comparator, electricity
Hold and first to fourth resistance, the in-phase input end of described comparator receives described first simulation letter by described first resistor
Number, and be connected with the first end of described electric capacity by described first resistor, receive reference signal, institute also by described second resistance
State the inverting input of comparator and described second analogue signal received by described 3rd resistor, and by described 3rd resistor and
Second end of described electric capacity is connected, and is connected with the outfan of described comparator also by described 4th resistance, described comparator
Outfan is connected with described Signal coding unit, to export described 3rd analogue signal to described Signal coding unit.
3. signal processing module as claimed in claim 2 it is characterised in that：Described signal receiving unit also includes the 5th to
Eight resistance, the in-phase input end of described comparator receives described first analogue signal also by described 5th resistance, and passes through institute
State the 6th resistance and receive described reference signal, the inverting input of described comparator receives described the also by described 7th resistance
Two analogue signals, and be connected with the outfan of described comparator by described 8th resistance.
4. signal processing module as claimed in claim 2 it is characterised in that：Described signal receiving unit also includes the first magnetic bead
And second magnetic bead, the power end of described comparator is connected with the first power supply by described first magnetic bead, the ground connection of described comparator
End is connected with second source by described second magnetic bead.
5. signal processing module as claimed in claim 1 it is characterised in that：Described Signal coding unit includes electric voltage frequency and turns
Parallel operation, the input pin of described voltage to frequency converter is connected with described signal receiving unit, to receive described 3rd simulation letter
Number, the output pin of described voltage to frequency converter is connected with described isolated location, to export described first frequency signal to institute
State isolated location.
6. signal processing module as claimed in claim 5 it is characterised in that：Described Signal coding unit also includes the 9th to
11 resistance, the input pin of described voltage to frequency converter is connected with described signal receiving unit by described 9th resistance,
The buffering pin of described voltage to frequency converter is connected with the first power supply by described tenth resistance, and is connect by the 11st resistance
Ground, the power pins of described voltage to frequency converter are connected with described first power supply, and the reference of described voltage to frequency converter is drawn
Foot is connected with described first power supply, and the clock pins of described voltage to frequency converter are connected with described isolated location, to receive
State the first clock signal of isolated location output, the grounding pin ground connection of described voltage to frequency converter.
7. signal processing module as claimed in claim 6 it is characterised in that：Described isolated location includes isolator, described every
The first input pin from device is connected with the output pin of described voltage to frequency converter, to receive described first frequency signal,
First output pin of described isolator exports described second frequency signal.
8. signal processing module as claimed in claim 7 it is characterised in that：Second input pin of described isolator receives the
Two clock signals, the second output pin of described isolator is connected with the clock pins of described voltage to frequency converter, to export
Described first clock signal give described voltage to frequency converter clock pins, the first power pins of described isolator with described
First power supply is connected, and the second source pin of described isolator is connected with the 3rd power supply, and first and second of described isolator connects
Ground pin is all grounded.
9. a kind of current detection circuit, including current sensor, the signal processing module as any one of claim 1-8
And control module, described current sensor is connected with described control module by described signal processing module, described signal processing
Module is processed to first and second analogue signal that described current sensor exports, and by the signal output after processing to institute
State control module.
10. current detection circuit as claimed in claim 9 it is characterised in that：Described current sensor includes diverter, described
Control module includes micro-control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620874777.5U CN205941835U (en) | 2016-08-12 | 2016-08-12 | Current detection circuit and signal processing module thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620874777.5U CN205941835U (en) | 2016-08-12 | 2016-08-12 | Current detection circuit and signal processing module thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205941835U true CN205941835U (en) | 2017-02-08 |
Family
ID=57920995
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620874777.5U Active CN205941835U (en) | 2016-08-12 | 2016-08-12 | Current detection circuit and signal processing module thereof |
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| Country | Link |
|---|---|
| CN (1) | CN205941835U (en) |
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2016
- 2016-08-12 CN CN201620874777.5U patent/CN205941835U/en active Active
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