CN105277774A - High-precision current monitoring circuit for power battery management - Google Patents
High-precision current monitoring circuit for power battery management Download PDFInfo
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- CN105277774A CN105277774A CN201510716286.8A CN201510716286A CN105277774A CN 105277774 A CN105277774 A CN 105277774A CN 201510716286 A CN201510716286 A CN 201510716286A CN 105277774 A CN105277774 A CN 105277774A
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Abstract
The invention discloses a high-precision current monitoring circuit for power battery management. According to the prior art, the problem of zero drift of a circuit caused by the remanence of a current sensor and the temperature drift of an operational amplifier cannot be solved, and the zero drift phenomenon reduces the precision of current monitoring. The high-precision current monitoring circuit for power battery management of the invention includes a linear Hall current sensor, a micro relay, an MCU, a first operational amplifier U1, a second operational amplifier U2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9. According to the high-precision current monitoring circuit for power battery management of the invention, after the circuit is electrified every time, automatic zero adjustment operation is carried out for once when a battery is in a static state, and offset voltage outputted by the current monitoring circuit in operation can be approximate to zero assuredly, and therefore, the precision of current monitoring can be improved.
Description
Technical field
The present invention relates to the technical field of electrokinetic cell management, particularly relate to a kind of high-precision current observation circuit.
Background technology
Electric current is as the important parameter of in electrokinetic cell management process, and the precision of electric current directly affects the precision of battery state of charge estimation.Along with the change of cell operating conditions and the prolongation of working time, the remanent magnetism phenomenon of Hall-type current sensor is further obvious, and environment temperature is also in moment change, and thus circuit there will be drift and temperature drift etc., affects the precision of electric current.Although the existing current sensors linearity is good, highly sensitive, the problem that drift and temperature drift appear in circuit also cannot be solved.
Summary of the invention
Object of the present invention overcomes the deficiencies in the prior art exactly, provides a kind of high-precision current observation circuit for electrokinetic cell management.
A kind of high-precision current observation circuit for electrokinetic cell management of the present invention, comprises linear Hall current sensor U3, midget relay U5, MCU, the first operational amplifier U1, the second operational amplifier U2, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9;
One end of the first described resistance R1 and the current output terminal VI of linear Hall current sensor U3, the in-phase input end of the first operational amplifier U1 connects, the other end ground connection of the first resistance R1, the inverting input of the first operational amplifier U1 and one end of the second resistance R2, one end of 3rd resistance R3 connects, the other end ground connection of the second resistance R2, the other end of the 3rd resistance R3 and the output terminal of the first operational amplifier U1, one end of 4th resistance R4 connects, positive voltage termination+15V the voltage of the first operational amplifier U1, negative voltage termination-15V the voltage of the first operational amplifier U1, the other end of the 4th resistance R4 and the in-phase input end of the second operational amplifier U2, one end of 5th resistance R5, one end of 6th resistance R6 connects, another termination+5V voltage of the 5th resistance R5, the other end ground connection of the 6th resistance R6, one end ground connection of the 7th resistance R7, the other end of the 7th resistance R7 and the inverting input of the second operational amplifier U2, one end of 8th resistance R8 connects, the other end of the 8th resistance R8 and the output terminal of the second operational amplifier U2, 2 pin of midget relay U5 connect, positive voltage termination+5V the voltage of the second operational amplifier U2, the negative voltage side ground connection of the second operational amplifier U2, 3 pin of midget relay U5 meet voltage output end VO, 4 pin of midget relay U5 connect+2.5V voltage, the 8 pin ground connection of midget relay U5, 1 pin of midget relay U5 is connected with one end of the 9th resistance R9, the other end of the 9th resistance R9 is connected with the PB9 pin of MCU,
The signal of described linear Hall current sensor U3 is LT-208-S1;
The model of the first described operational amplifier is ADA4638-1;
The model of described midget relay U5 is G6K-2F-Y;
The model of described MCU is STM32F407ZET6.
Beneficial outcomes of the present invention: have the intellectuality of zeroing process and high precision electro flow monitoring, circuit structure is simple, and circuit maintenance is simple, with low cost, circuit sensor remanent magnetism and environment temperature affect little on circuit.
In order to solve the problems of the technologies described above, present invention employs following technical scheme:
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present invention;
Embodiment
As shown in Figure 1, a kind of high-precision current observation circuit for electrokinetic cell management of the present invention comprises linear Hall current sensor U3 (LT-208-S1), operation amplifier circuit, midget relay U5 control circuit, MCU (STM32F407ZET6).
Described arithmetical unit amplifying circuit comprises the first operational amplifier U1 (ADA4638-1), the second operational amplifier U2 (OPA340), the first resistance R1 (33 Ω), the second resistance R2 (10K Ω), the 3rd resistance R3 (10K Ω), the 4th resistance R4 (50K Ω), the 5th resistance R5 (20K Ω), the 6th resistance R6 (20K Ω), the 7th resistance R7 (50K Ω), the 8th resistance R8 (10K Ω);
Described midget relay U5 control circuit comprises midget relay U5 (G6K-2F-Y), the 9th resistance R9 (5.1 Ω);
One end of first resistance R1 and the current output terminal VI of linear Hall current sensor U3, the in-phase input end of the first operational amplifier U1 connects, the other end ground connection of the first resistance R1, the inverting input of the first operational amplifier U1 and one end of the second resistance R2, one end of 3rd resistance R3 connects, the other end ground connection of the second resistance R2, the other end of the 3rd resistance R3 and the output terminal of the first operational amplifier U1, one end of 4th resistance R4 connects, positive voltage termination+15V the voltage of the first operational amplifier U1, negative voltage termination-15V the voltage of the first operational amplifier U1, the other end of the 4th resistance R4 and the in-phase input end of the second operational amplifier U2, one end of 5th resistance R5, one end of 6th resistance R6 connects, another termination+5V voltage of the 5th resistance R5, the other end ground connection of the 6th resistance R6, one end ground connection of the 7th resistance R7, the other end of the 7th resistance R7 and the inverting input of the second operational amplifier U2, one end of 8th resistance R8 connects, the other end of the 8th resistance R8 and the output terminal of the second operational amplifier U2, 2 pin of midget relay U5 connect, positive voltage termination+5V the voltage of the second operational amplifier U2, the negative voltage side ground connection of the second operational amplifier U2, 3 pin of midget relay U5 meet voltage output end VO, 4 pin of midget relay U5 connect+2.5V voltage, the 8 pin ground connection of midget relay U5, 1 pin of midget relay U5 is connected with one end of the 9th resistance R9, the other end of the 9th resistance R9 is connected with the PB9 pin of MCU.
In the embodiment of the present invention, the current measuring range of linear Hall current sensor U3 is-300A-+300A, the range of current of the current output terminal VI of linear Hall current sensor U3 is-150mA-+150mA, voltage range after the first resistance R1 (33 Ω) sampling is-4.95V-+4.95V, if need the minimum current measured to be 100mA, so the voltage of linear hall sensor current output terminal VI is 1.65mV, the model of the present invention first operational amplifier U1 is ADA4638-1, the offset voltage of this operational amplifier is low to moderate 4uV, by the first operational amplifier U1, second resistance R2, input voltage range is extended to-9.9V-+9.9V by the in-phase proportion computing circuit that the 3rd resistance R3 forms, this voltage is as by the second operational amplifier U2, 4th resistance R4, 5th resistance R5, 6th resistance R6, 7th resistance R7, the input of the adder operation circuit that the 8th resistance R8 forms, adder operation circuit converts the bipolar voltage scope of input to electrode scope 0.52V-4.48V, the model of the second operational amplifier U2 is OPA340, this operational amplifier is track to track output operational amplifier, the output of adder operation circuit inputs to 2 pin of the midget relay U5 of normally off, then 3 pin of midget relay U5 are connected with voltage output pin VO, the magnitude of voltage exported is designated as V
out(unit: V), foregoing circuit completes the current monitoring of degree of precision from the type selecting of linear Hall current sensor U3, the type selecting of operational amplifier and the flexible conversion of voltage range, solution is floated by the remanent magnetism of linear Hall current sensor U3, the temperature of operational amplifier the drift problem brought below.
Circuit automatically carries out zeroing at every turn and solves drift problem after powering on, the process of zeroing is as follows: electrokinetic cell remains static, the PB9 pin of MCU exports high level, 1 pin of midget relay U5 is connected with 8 pin inside, 9th resistance R9 is current-limiting resistance, 3 pin adhesive to 4 pin of midget relay U5, voltage output end VO and+2.5V Voltage On state, wherein+2.5V voltage is provided by voltage reference chip, now complete the calibration of normal voltage+2.5V to circuit, time delay 5ms, the PB9 pin output low level of MCU, the 3 pin recoveries of midget relay U5 and the connection of 2 pin, at this moment under electrokinetic cell stationary state, the magnitude of voltage of voltage output end VO is designated as V
static(unit: V), this completes the self zeroing process of circuit, now provides battery under any state, and the computing formula of circuit zeroing after-current, the magnitude of voltage of voltage output end VO is V
out, to the measurement result of electric current being designated as I=(V under the moment
out-V
static) * 5000.0/33.0 Ω (unit: A).
Claims (5)
1., for a high-precision current observation circuit for electrokinetic cell management, comprise linear Hall current sensor U3, midget relay U5, MCU, the first operational amplifier U1, the second operational amplifier U2, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9;
One end of the first described resistance R1 and the current output terminal VI of linear Hall current sensor U3, the in-phase input end of the first operational amplifier U1 connects, the other end ground connection of the first resistance R1, the inverting input of the first operational amplifier U1 and one end of the second resistance R2, one end of 3rd resistance R3 connects, the other end ground connection of the second resistance R2, the other end of the 3rd resistance R3 and the output terminal of the first operational amplifier U1, one end of 4th resistance R4 connects, positive voltage termination+15V the voltage of the first operational amplifier U1, negative voltage termination-15V the voltage of the first operational amplifier U1, the other end of the 4th resistance R4 and the in-phase input end of the second operational amplifier U2, one end of 5th resistance R5, one end of 6th resistance R6 connects, another termination+5V voltage of the 5th resistance R5, the other end ground connection of the 6th resistance R6, one end ground connection of the 7th resistance R7, the other end of the 7th resistance R7 and the inverting input of the second operational amplifier U2, one end of 8th resistance R8 connects, the other end of the 8th resistance R8 and the output terminal of the second operational amplifier U2, 2 pin of midget relay U5 connect, positive voltage termination+5V the voltage of the second operational amplifier U2, the negative voltage side ground connection of the second operational amplifier U2, 3 pin of midget relay U5 meet voltage output end VO, 4 pin of midget relay U5 connect+2.5V voltage, the 8 pin ground connection of midget relay U5, 1 pin of midget relay U5 is connected with one end of the 9th resistance R9, the other end of the 9th resistance R9 is connected with the PB9 pin of MCU.
2. a kind of high-precision current observation circuit for electrokinetic cell management according to claim 1, is characterized in that: the model of described linear Hall current sensor U3 is LT-208-S1.
3. a kind of high-precision current observation circuit for electrokinetic cell management according to claim 1, is characterized in that: the model of the first described operational amplifier is ADA4638-1.
4. a kind of high-precision current observation circuit for electrokinetic cell management according to claim 1, is characterized in that: the model of described midget relay U5 is G6K-2F-Y.
5. a kind of high-precision current observation circuit for electrokinetic cell management according to claim 1, is characterized in that: the model of described MCU is STM32F407ZET6.
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| CN201510716286.8A CN105277774B (en) | 2015-10-29 | 2015-10-29 | A kind of high-precision current observation circuit for electrokinetic cell management |
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| CN201510716286.8A CN105277774B (en) | 2015-10-29 | 2015-10-29 | A kind of high-precision current observation circuit for electrokinetic cell management |
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| CN105277774B CN105277774B (en) | 2017-12-26 |
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Cited By (4)
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| CN108761337A (en) * | 2018-05-03 | 2018-11-06 | 自贡同发荣实业有限公司 | A kind of lithium battery management system |
| CN110286259A (en) * | 2019-07-12 | 2019-09-27 | 浙江匠联科技有限公司 | A kind of current peak detection circuit |
| CN110888069A (en) * | 2018-08-15 | 2020-03-17 | 上海汽车集团股份有限公司 | Current detection method and device for power battery |
| CN113848371A (en) * | 2021-09-26 | 2021-12-28 | 南方电网数字电网研究院有限公司 | Current sensor, current measuring apparatus, method, and storage medium |
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| CN105277774B (en) | 2017-12-26 |
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Application publication date: 20160127 Assignee: Soyea Technology Co., Ltd. Assignor: Hangzhou Electronic Science and Technology Univ Contract record no.: X2019330000056 Denomination of invention: High-precision current monitoring circuit for power battery management Granted publication date: 20171226 License type: Common License Record date: 20191226 |
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