CN207215896U - A kind of current detection circuit calculated based on SOC - Google Patents
A kind of current detection circuit calculated based on SOC Download PDFInfo
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- CN207215896U CN207215896U CN201720466725.9U CN201720466725U CN207215896U CN 207215896 U CN207215896 U CN 207215896U CN 201720466725 U CN201720466725 U CN 201720466725U CN 207215896 U CN207215896 U CN 207215896U
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Abstract
The utility model discloses a kind of current detection circuit calculated based on SOC, including：MCU, some sensors and connection sensor and MCU signal processing circuit；The sensor includes two kinds of divertor, Hall sensor sensors.Wherein, the signal processing circuit connected between Hall sensor and MCU detects circuit for Hall sensor, and the circuit connected between divertor and MCU detects circuit 3 for current divider；The sensor is used for sensor current signal, and produces difference or single ended voltage detection signal；The signal processing circuit is used to handle the current signal that sensor detects, and delivers it to MCU and complete current detecting.The utility model alleviates MCU internal arithmetic workloads, reduces resource requirement, the utility model can combine specific circuit and algorithm, the precision of current measurement be improved, so as to ensure the course continuation mileage of new energy car by the way that current measurement is freed from MCU.
Description
Technical field
It the utility model is related to the electric current calculated in new-energy automobile field, more particularly to a kind of BMS systems based on SOC
Detect circuit.
Background technology
BMS systems in existing new-energy automobile are required for using SOC calculating, and this is associated with the continuation of the journey of electric automobile
Journey.Course continuation mileage more and more higher permissible accuracy requirement of the in the market to electric automobile, is required for more accurate current detecting
Scheme is realized.Therefore, to the requirement of the SOC precision calculated, also constantly improving.
On the premise of the target of SOC computational accuracies of electric automobile BMS systems is improved, increasing solution quilt
Application.It is current integration method to compare classical way, and other relatively new computational methods also have：Electrochemical frequency spectrometry,
Internal resistance method, linear model method, neural network, Kalman filtering method etc..These algorithms all expedite the emergence of higher current sample frequency
The demand of rate, for improving the real-time of testing current, but this also means that MCU also can more participate in digital filtering calculation
Method and Current calculation.
Portion of electrical current detection circuit shown in reference picture 1, battery management system current detection scheme on the market, is all adopted
With the current divider or Hall element of precision come sample rate current, and after the current signal sampled with the use of the amplification of accurate amplifier,
Directly sending to MCU does A/D conversions, obtains real-time Current Voltage.Then handled by MCU programs, do corresponding filtering algorithm, come
Noise is removed, obtains effective current value.
However, including the current detection scheme of the low cost of battery management system on the market including such scheme, all deposit
The occupancy MCU resources the problem of.Because MCU needs substantial amounts of time resource to go calculating current value.Typically in order to meet increasingly
The current sample precision problem of raising, it can all improve the frequency of current sample.Into a bottleneck of liberation MCU resources.
Therefore, the prior art is defective, it is necessary to improve.
Utility model content
The purpose of this utility model is overcome the deficiencies in the prior art, there is provided a kind of current detecting electricity calculated based on SOC
Road.
The technical solution of the utility model is as follows：A kind of current detection circuit calculated based on SOC, including：It is MCU, some
Sensor and connection sensor and MCU signal processing circuit；The sensor is used for sensor current signal, and produces difference
Or single ended voltage detection signal；The signal processing circuit is used to handle the current signal that sensor detects, and by the signal
Send MCU to and complete current detecting.
Further, one kind in divertor, Hall sensor, fluxgate sensor of the sensor or
It is a variety of.
Further, the sensor is Hall sensor, and the signal processing circuit includes subtraction circuit, signal amplifies
Circuit and the first filter circuit；The Hall sensor and subtraction circuit one end connection, the other end of the subtraction circuit with
Signal amplification circuit connects, and the other end of the signal amplification circuit connects the first filter circuit；First filter circuit
The other end connects MCU.
Further, the signal processing circuit includes resistance R295, resistance 296, resistance R297, resistance R298, electric capacity
C175, electric capacity C176, electric capacity C177, electric capacity C178, electric capacity C179, operational amplifier, voltage-regulator diode D111, Hall sensor
Port HALL_VOUT；Termination a MCU, another terminating resistor R297, resistance R297 of the resistance R295 another termination fortune
Calculate the output end of amplifier；An electric capacity C176 termination MCU, other end ground connection；An electric capacity C177 end be connected on resistance R295 with
Between resistance R297, other end ground connection；The output end of a resistance R298 termination operational amplifier, another termination operational amplifier
Negative supply input；The electric capacity C179 is connected in parallel on resistance R298 both ends；The positive supply termination of the operational amplifier
Ground, the negative supply termination power of the operational amplifier, the negative power end of a termination operational amplifier of the electric capacity C175, separately
One end is grounded；Hall sensor port HALL_VOUT is met again after the positive input terminal connecting resistance R296 of the operational amplifier；It is described
The positive input terminal of an electric capacity C178 termination operational amplifier, other end ground connection；The terminating resistors of voltage-regulator diode D111 mono-
Between R296 and Hall sensor port HALL_VOUT, other end ground connection.
Further, the sensor is divertor, and the signal processing circuit, which includes one, can sense differential signal
The second filter circuit, second filter circuit includes poor membrane filtration wave circuit and common mode filtering circuit, can be to peak point current
Spiking carries out clipping, to protect the differential signal port of connection divertor.
Further, the signal processing circuit includes：Electric capacity C183, electric capacity C184, electric capacity C185, electric capacity C186, electricity
Hinder R308, resistance R310, voltage-regulator diode D114, diode D115, diode D116, voltage-regulator diode D117, shunt resistance
Device difference port SOC_P and SOC_N；The electric capacity C185 is connected between divertor difference port SOC_P and SOC_N；Institute
It is grounded again after stating electric capacity C185 termination voltage-regulator diode D114 positive pole, electric capacity C185 another terminating diode D117
It is grounded again behind end；The diode D116 is connected in parallel on C117 both ends；The diode D115 is connected in parallel on diode D116 two
End；The other end ground connection of the electric capacity C183, electric capacity C184 and electric capacity C186 series connection, electric capacity C183 and resistance 186；Resistance R308
An end be connected on diode D115 positive pole, it is another to terminate between electric capacity C183 and electric capacity C184；The one of the resistance R310
Diode D115 negative pole is terminated at, the another of resistance R310 is terminated between electric capacity C184 and electric capacity C186；The electric capacity
C184 two termination MCU.
Further, the model ISL28023FR60Z of the MCU.
Further, the model MAX44248ASA of the operational amplifier.
Using such scheme, the utility model has the advantages that：
Hall sensor detection circuit in the current detection circuit of utility model also includes a Hall sensor port
HALL_VOUT can be with the Hall member of compatible conventional as real-time voltage Sampling Interface, Hall sensor port HALL_VOUT
Part direct current 2.5V biases difference output, and integrated level is high, greatly simplify circuit design.
Current detection circuit of the present utility model includes a Real-Time Filtering circuit, i.e. the second filter circuit, the filtered electrical
Road can obtain average electric current letter under complex working condition, to that under interference noise, can filter out the noise of not demand in real time
Number.
The utility model alleviates MCU internal arithmetic workloads, reduces resource requirement, MCU is freed, do
Other work.
Current measurement circuit design is simplified, R ＆ D Cost is saved, shortens the R＆D cycle.To core inside BMS systems
The SOC of the heart is calculated, and reduces the threshold of research staff's current measurement link.The utility model can combine specific circuit and calculation
Method, calculated to the SOC inside new energy car and accurately Current calculation basis is provided, the precision of current measurement is improved, so as to ensure
The course continuation mileage of new energy car.
Brief description of the drawings
Fig. 1 is the partial circuit schematic diagram of existing current detection circuit；
Fig. 2 is the circuit theory diagrams of the utility model specific embodiment；
Fig. 3 is the circuit theory diagrams that Hall sensor detects circuit in the utility model specific embodiment；
Fig. 4 is the circuit theory diagrams that current divider detects circuit in the utility model specific embodiment.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
For reference picture 2 to shown in Fig. 4, the utility model provides a kind of current detection circuit calculated based on SOC, including：MCU
1st, the signal processing circuit of some sensors and connection sensor and MCU 1；The sensor is used for sensor current signal, and
Produce difference or single ended voltage detection signal；The signal processing circuit is used to handle the current signal that sensor detects, and
Deliver it to MCU 1 and complete current detecting, wherein, the model ISL28023FR60Z of the MCU 1.
One or more of the sensor in divertor, Hall sensor, fluxgate sensor.As
A kind of embodiment, the utility model include two kinds of divertor, Hall sensor sensors.Wherein, Hall sensor is connected
Signal processing circuit between MCU 1 detects circuit 2 for Hall sensor, connects the electricity between divertor and MCU 1
Road is that current divider detects circuit 3.
It is noted that the Hall sensor detection circuit 2 includes subtraction circuit, signal amplification circuit and the first filter
Wave circuit；One end connection of the Hall sensor and subtraction circuit, the other end and signal amplification circuit of the subtraction circuit
Connection, the other end of the signal amplification circuit connect the first filter circuit；The other end connection MCU of first filter circuit
1。
Hall sensor detection circuit 2 specifically includes resistance R295, resistance 296, resistance R297, resistance R298, electric capacity
C175, electric capacity C176, electric capacity C177, electric capacity C178, electric capacity C179, operational amplifier, voltage-regulator diode D111, Hall sensor
Port HALL_VOUT；A termination MCU 1 of the resistance R295, another terminating resistor R297, resistance R297 another termination
The output end of operational amplifier；An electric capacity C176 termination MCU 1, other end ground connection；An electric capacity C177 end is connected on resistance
Between R295 and resistance R297, other end ground connection；The output end of a resistance R298 termination operational amplifier, another termination computing
The negative supply input of amplifier；The electric capacity C179 is connected in parallel on resistance R298 both ends；The positive supply of the operational amplifier
End ground connection, the negative supply termination power of the operational amplifier, the negative supply of a termination operational amplifier of the electric capacity C175
End, other end ground connection；Hall sensor port HALL_ is met again after the positive input terminal connecting resistance R296 of the operational amplifier
VOUT；The positive input terminal of a termination operational amplifier of the electric capacity C178, other end ground connection；The voltage-regulator diode D111 mono-
Between terminating resistor R296 and Hall sensor port HALL_VOUT, other end ground connection.The model of the operational amplifier
MAX44248ASA。
The current divider detection circuit 3 includes second filter circuit that can sense differential signal, second filtered electrical
Road includes poor membrane filtration wave circuit and common mode filtering circuit, Xiao Bo amplitude limits can be carried out to the spiking of peak point current, to protect
Connect the differential signal port of divertor.Specifically include：Electric capacity C183, electric capacity C184, electric capacity C185, electric capacity 186, resistance
R308, resistance R310, voltage-regulator diode D114, diode D115, diode D116, voltage-regulator diode D117, divertor
Difference port SOC_P and SOC_N；The electric capacity C185 is connected between divertor difference port SOC_P and SOC_N；It is described
It is grounded again after electric capacity C185 termination voltage-regulator diode D114 positive pole, behind electric capacity C185 another terminating diode D117 ends
It is grounded again；The diode D116 is connected in parallel on C117 both ends；The diode D115 is connected in parallel on diode D116 both ends；Institute
State electric capacity C183, electric capacity C184 and electric capacity C186 series connection, electric capacity C183 and resistance 186 other end ground connection；The one of resistance R308
Diode D115 positive pole is terminated at, it is another to terminate between electric capacity C183 and electric capacity C184；A termination of the resistance R310
In diode D115 negative pole, the another of resistance R310 is terminated between electric capacity C184 and electric capacity C186；The electric capacity C184's
Two termination MCU 1.
The utility model Current calculation, removes current filtering algorithm, is put into outside MCU 1 in being worked from traditional MCU 1
Face is handled.MCU 1 load is greatly alleviated, has been liberated in MCU 1 money current detection circuit of the present utility model
Hall sensor detection circuit 2 also include Hall sensor port HALL_VOUT and be used as real-time voltage Sampling Interface, this
Hall sensor port HALL_VOUT can bias difference output with the Hall element direct current 2.5V of compatible conventional, and integrated level is high,
It greatly simplify circuit design.Current detection circuit of the present utility model includes a Real-Time Filtering circuit, i.e., the second filtering
Circuit, the filter circuit can be under complex working conditions, to that under interference noise, can filter out the noise of not demand in real time, obtain
Average current signal.
In summary, the utility model alleviates MCU internal arithmetic workloads, reduces resource requirement, and MCU is solved and released
Come, do other work.The utility model simplifies current measurement circuit design, saves R ＆ D Cost, shortens research and development week
Phase.The SOC of core inside BMS systems is calculated, reduces the threshold of research staff's current measurement link.The utility model can be tied
Specific circuit and algorithm are closed, is calculated to the SOC inside new energy car and accurately Current calculation basis is provided, improve current measurement
Precision, so as to ensure the course continuation mileage of new energy car.
Preferred embodiment of the present utility model is these are only, is not limited to the utility model, it is all in this practicality
All any modification, equivalent and improvement made within new spirit and principle etc., should be included in guarantor of the present utility model
Within the scope of shield.
Claims (8)
- A kind of 1. current detection circuit calculated based on SOC, it is characterised in that including：MCU, some sensors and connection pass The signal processing circuit of sensor and MCU；The sensor is used for sensor current signal, and produces difference or single ended voltage detection letter Number；The signal processing circuit is used to handle the current signal that sensor detects, and delivers it to MCU and complete electric current Detection.
- 2. the current detection circuit according to claim 1 calculated based on SOC, it is characterised in that the sensor is selected from One or more in divertor, Hall sensor, fluxgate sensor.
- 3. the current detection circuit according to claim 1 calculated based on SOC, it is characterised in that the sensor is suddenly That sensor, the signal processing circuit include subtraction circuit, signal amplification circuit and the first filter circuit；The hall sensing One end of device and subtraction circuit is connected, and the other end of the subtraction circuit is connected with signal amplification circuit, the signal amplification electricity The other end on road connects the first filter circuit；The other end connection MCU of first filter circuit.
- 4. the current detection circuit according to claim 3 calculated based on SOC, it is characterised in that the signal transacting electricity Road includes resistance R295, resistance R296, resistance R297, resistance R298, electric capacity C175, electric capacity C176, electric capacity C177, electric capacity C178, electric capacity C179, operational amplifier, voltage-regulator diode D111, Hall sensor port HALL_VOUT；The resistance R295 One termination MCU, the output end of another terminating resistor R297, resistance R297 another termination operational amplifier；Electric capacity C176's One termination MCU, other end ground connection；An electric capacity C177 end is connected between resistance R295 and resistance R297, other end ground connection；Resistance The output end of a R298 termination operational amplifier, the negative supply input of another termination operational amplifier；The electric capacity C179 It is connected in parallel on resistance R298 both ends；The positive power source terminal ground connection of the operational amplifier, the negative supply termination of the operational amplifier Power supply, the negative power end of a termination operational amplifier of the electric capacity C175, other end ground connection；The operational amplifier it is just defeated Hall sensor port HALL_VOUT is met again after entering terminating resistor R296；A termination operational amplifier of the electric capacity C178 Positive input terminal, other end ground connection；The terminating resistor R296 of voltage-regulator diode D111 mono- and Hall sensor port HALL_VOUT Between, other end ground connection.
- 5. the current detection circuit according to claim 1 calculated based on SOC, it is characterised in that the sensor is electricity Current divider is hindered, the signal processing circuit includes second filter circuit that can sense differential signal, second filter circuit Including poor membrane filtration wave circuit and common mode filtering circuit, Xiao Bo amplitude limits can be carried out to the spiking of peak point current, to the company of protection The differential signal port of connecting resistance current divider.
- 6. the current detection circuit according to claim 5 calculated based on SOC, it is characterised in that the signal transacting electricity Road includes：Electric capacity C183, electric capacity C184, electric capacity C185, electric capacity C186, resistance R308, resistance R310, voltage-regulator diode D114, Diode D115, diode D116, voltage-regulator diode D117, divertor difference port SOC_P and SOC_N；The electric capacity C185 is connected between divertor difference port SOC_P and SOC_N；A termination voltage-regulator diode D114 of the electric capacity C185 Positive pole after be grounded again, be grounded again behind electric capacity C185 another terminating diode D117 ends；The diode D116 is connected in parallel on C117 both ends；The diode D115 is connected in parallel on diode D116 both ends；The electric capacity C183, electric capacity C184 and electric capacity C186 Series connection, electric capacity C183 and resistance R186 other end ground connection；A resistance R308 end is connected on diode D115 positive pole, the other end It is connected between electric capacity C183 and electric capacity C184；An end of the resistance R310 is connected on diode D115 negative pole, resistance R310's It is another to terminate between electric capacity C184 and electric capacity C186；The two termination MCU of the electric capacity C184.
- 7. the current detection circuit according to claim 1 calculated based on SOC, it is characterised in that the model of the MCU ISL28023FR60Z。
- 8. the current detection circuit according to claim 4 calculated based on SOC, it is characterised in that the operational amplifier Model MAX44248ASA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720466725.9U CN207215896U (en) | 2017-04-28 | 2017-04-28 | A kind of current detection circuit calculated based on SOC |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720466725.9U CN207215896U (en) | 2017-04-28 | 2017-04-28 | A kind of current detection circuit calculated based on SOC |
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| CN207215896U true CN207215896U (en) | 2018-04-10 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108512512A (en) * | 2018-06-27 | 2018-09-07 | 沈阳工程学院 | The online failure detector of solar energy off-network power generation |
| CN108809256A (en) * | 2018-06-27 | 2018-11-13 | 沈阳工程学院 | A kind of photovoltaic off-grid power failure intelligent checking system |
| CN109039276A (en) * | 2018-06-27 | 2018-12-18 | 沈阳工程学院 | A kind of portable on-line fault diagnosis device in photovoltaic off-grid power station |
| CN112858768A (en) * | 2021-01-07 | 2021-05-28 | 力高(山东)新能源技术有限公司 | Circuit and method for improving current detection precision of current divider |
-
2017
- 2017-04-28 CN CN201720466725.9U patent/CN207215896U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108512512A (en) * | 2018-06-27 | 2018-09-07 | 沈阳工程学院 | The online failure detector of solar energy off-network power generation |
| CN108809256A (en) * | 2018-06-27 | 2018-11-13 | 沈阳工程学院 | A kind of photovoltaic off-grid power failure intelligent checking system |
| CN109039276A (en) * | 2018-06-27 | 2018-12-18 | 沈阳工程学院 | A kind of portable on-line fault diagnosis device in photovoltaic off-grid power station |
| CN112858768A (en) * | 2021-01-07 | 2021-05-28 | 力高(山东)新能源技术有限公司 | Circuit and method for improving current detection precision of current divider |
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| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 518000 Guangdong Shenzhen Baoan District Xin'an Street Hai Yu community 82 District Huafeng science and technology trade building 420 Patentee after: Shenzhen Rui Energy Technology Co., Ltd. Address before: 518000 Guangdong Shenzhen Futian District Sha tou street Che Kung Temple Futian Tianan science and Technology Pioneer Park building A100 Patentee before: Shenzhen city river Amperex Technology Limited |
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