CN208937642U - Intelligent current sensor based on double split flow device - Google Patents
Intelligent current sensor based on double split flow device Download PDFInfo
- Publication number
- CN208937642U CN208937642U CN201821620614.XU CN201821620614U CN208937642U CN 208937642 U CN208937642 U CN 208937642U CN 201821620614 U CN201821620614 U CN 201821620614U CN 208937642 U CN208937642 U CN 208937642U
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- Prior art keywords
- current
- voltameter
- split flow
- flow device
- current sensor
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Abstract
The utility model proposes a kind of Intelligent current sensors based on double split flow device, including two-way current divider, it connects in charge circuit all the way, another way connects in discharge loop, the output end of two-way current divider is connected respectively to the input terminal of voltameter chip, the output end of two voltameter chips is connected respectively to the input terminal of operation single-chip microcontroller, and operation single-chip microcontroller connects subsequent communications device.The utility model uses two current dividers, is each responsible for the electric current of charge circuit and discharge loop, and the range of each current divider can be determined according to the upper current limit in this circuit, so as to improve the precision of measurement.The utility model uses voltameter, and high speed may be implemented and measure electric current to improve the precision of current measurement, in addition the digital signal of voltameter output, strong antijamming capability finally make SOC valuation more accurate.
Description
Technical field
The utility model relates to current sensors.
Background technique
SOC full name is State of Charge, state-of-charge, is also remaining capacity, representative be battery using one section when
Between or for a long time lie idle after residual capacity and its fully charged state capacity ratio.Usually it is to the estimation of SOC value
It is calculated by the current sampling circuit being made of current divider, single-chip microcontroller etc..Current divider is actually the electricity of a resistance value very little
Resistance, for converting voltage signal for the electric current for flowing through itself, in order to carry out current sample to battery pack.Under normal circumstances,
One battery pack only will use a current divider, i.e., when battery charges and discharges, electric current all flows through this current divider.But
Be, in most cases discharge current can be higher than charging current, therefore the range of current divider would generally according to the discharge current upper limit come
It determines.So, when battery charges, charging current can only use the sub-fraction of current divider range, greatly reduce survey
Accuracy of measurement.
On the other hand, the voltage of current divider output is differential voltage, need converted device be converted into single ended voltage export again to
Single-chip microcontroller, single ended voltage are analog signal, and the route between converter and single-chip microcontroller is longer, and transmission process is extremely vulnerable to dry
It disturbs, and the speed of single-chip microcontroller monitoring voltage is that Millisecond is other, voltage error is big, certainly will influence the estimation precision of final SOC.
Utility model content
There is interference and the low estimation precision so as to cause final SOC of measurement accuracy to solve existing current sample process
Low problem proposes a kind of Intelligent current sensor based on double split flow device, following scheme is used to be achieved:
A kind of Intelligent current sensor based on double split flow device, including two-way current divider, connect in charge circuit, separately all the way
It connects in discharge loop all the way, the output end of two-way current divider is connected respectively to the input terminal of voltameter chip, two voltameter cores
The output end of piece is connected respectively to the input terminal of operation single-chip microcontroller, and operation single-chip microcontroller connects subsequent communications device.
Further, the voltameter chip uses MAX17260.
Further, in the discharge loop current divider range be greater than charge circuit in current divider range.
Further, the operation single-chip microcontroller uses STM32F103C8T6.
Further, it is digital signal that the voltameter chip, which is output to the signal in single-chip microcontroller,.
Further, the operation single-chip microcontroller by CAN interface or crosses RS485 interface connection subsequent communications device.
Further, the subsequent communications device is control single chip computer.
Compared with prior art, it the advantages of the utility model and has the active effect that
The utility model uses two current dividers, is each responsible for the electric current of detection battery charge circuit and discharge loop, often
The range of a current divider can be determined according to the upper current limit in this circuit, so as to improve the precision of measurement.The utility model
Using voltameter, high speed may be implemented and measure electric current to improve the precision of current measurement, the number that in addition voltameter exports
Signal, strong antijamming capability finally make SOC valuation more accurate.
Detailed description of the invention
Fig. 1 is Intelligent current sensor circuit functional block diagram of the utility model based on double split flow device.
Specific embodiment
The utility model is described in more detail with reference to the accompanying drawings and detailed description.
With reference to Fig. 1, Intelligent current sensor of the present embodiment based on double split flow device includes two-way current divider (one above in figure
Road is the first via, is below all the way the second tunnel), voltameter and operation single-chip microcontroller, first via current divider be connected in charge circuit,
The output end of current divider connects the differential input end of the first voltameter, and the of the output end connection operation single-chip microcontroller of the first voltameter
One second input terminal；No. second current divider is connected in discharge loop, and the output end of current divider connects the difference of the second voltameter
Input terminal, the 3rd the 4th input terminal of the output end connection operation single-chip microcontroller of the second voltameter.
Usual battery discharge current is higher than charging current, therefore the range of the present embodiment current divider is according to charging and discharging currents
Depending on the upper limit, the range setting of current divider is greater than the range of current divider in charge circuit in discharge loop, in this way, each divide
The range of stream device can be determined according to the upper current limit in this circuit, to improve the precision of measurement.
The voltage of current divider output is differential voltage, i.e., voltage reference is not GND, and the present embodiment selects Maxim
MAX17260 voltameter come measure current divider generation differential voltage.MAX17260 also has a coulomb counter, can be in high speed
While measuring electric current, measurement result is added to a coulomb counter, realizes the automatic integration of electric current.Operation single-chip microcontroller can be with
MAX17260 communicates to configure MAX17260, and obtains the electric current of charge circuit and discharge loop and the electric current of coulomb counter
Accumulated value.In single-chip microcontroller, electric current accumulated value is multiplied with the current sample period of MAX17260, as the electricity that has used of battery
Amount.On the other hand, the signal of MAX17260 voltameter output is digital signal, although MAX17260 voltameter and operation monolithic are straight
The cabling connect is longer, analog signal transmission bring interference effect before overcoming.
The present embodiment operation single-chip microcontroller uses STM32F103C8T6, can be by CAN interface and RS485 interface for communicating.
The present embodiment Intelligent current sensor passes through two-way diverter designs and cooperation voltameter and operation chip microcontroller
To the precise measurement of electric current, and to external equipment for example subsequent control single chip computer directly export precise measurement charging current,
The SOC value of discharge current and battery pack.
The above descriptions are merely preferred embodiments of the present invention, is not to make other forms to the utility model
Limitation, any person skilled in the art is changed or is modified as possibly also with the technology contents of the disclosure above equivalent
The equivalent embodiment of variation is applied to other fields, but all without departing from the content of the technical scheme of the utility model, according to this reality
With novel technical spirit any simple modification, equivalent variations and remodeling to the above embodiments, it is practical new to still fall within this
The protection scope of type technical solution.
Claims (8)
1. a kind of Intelligent current sensor based on double split flow device, it is characterised in that: including two-way current divider, connect charging all the way
In circuit, another way is connect in discharge loop, and the output end of two-way current divider is connected respectively to the input terminal of voltameter chip, and two
The output end of voltameter chip is connected respectively to the input terminal of operation single-chip microcontroller, and operation single-chip microcontroller connects subsequent communications device.
2. the Intelligent current sensor according to claim 1 based on double split flow device, it is characterised in that: the voltameter core
Piece uses MAX17260.
3. the Intelligent current sensor according to claim 1 based on double split flow device, it is characterised in that: the discharge loop
The range of middle current divider is greater than the range of current divider in charge circuit.
4. the Intelligent current sensor according to claim 1 based on double split flow device, it is characterised in that: the operation monolithic
Machine uses STM32F103C8T6.
5. the Intelligent current sensor according to claim 1 based on double split flow device, it is characterised in that: the voltameter core
It is digital signal that piece, which is output to the signal in single-chip microcontroller,.
6. the Intelligent current sensor according to claim 4 based on double split flow device, it is characterised in that: the operation monolithic
Machine connects subsequent communications device by CAN interface.
7. the Intelligent current sensor according to claim 4 based on double split flow device, it is characterised in that: the operation monolithic
Machine connects subsequent communications device by RS485 interface.
8. the Intelligent current sensor according to claim 6 or 7 based on double split flow device, it is characterised in that: described subsequent
Communication device is control single chip computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821620614.XU CN208937642U (en) | 2018-09-30 | 2018-09-30 | Intelligent current sensor based on double split flow device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821620614.XU CN208937642U (en) | 2018-09-30 | 2018-09-30 | Intelligent current sensor based on double split flow device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208937642U true CN208937642U (en) | 2019-06-04 |
Family
ID=66723530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821620614.XU Expired - Fee Related CN208937642U (en) | 2018-09-30 | 2018-09-30 | Intelligent current sensor based on double split flow device |
Country Status (1)
| Country | Link |
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| CN (1) | CN208937642U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2018
- 2018-09-30 CN CN201821620614.XU patent/CN208937642U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190604 Termination date: 20190930 |