CN205157638U - Current acquisition circuit - Google Patents
Current acquisition circuit Download PDFInfo
- Publication number
- CN205157638U CN205157638U CN201520878222.3U CN201520878222U CN205157638U CN 205157638 U CN205157638 U CN 205157638U CN 201520878222 U CN201520878222 U CN 201520878222U CN 205157638 U CN205157638 U CN 205157638U
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- Prior art keywords
- resistance
- current collection
- operational amplifier
- chip
- electric capacity
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Abstract
The utility model relates to a current acquisition circuit, including a filter circuit, operational amplifier and AD sampling chip, positive current collection end I+ and positive input terminal and the negative pole input of negative current collection end I - difference cross -over connection at a filter circuit, connect to operational amplifier's syntropy input behind a filter circuit's the positive output end series resistance R4, connect behind the cathode output series resistance R8 to operational amplifier's reverse input end, meet to AD sampling chip's reference voltage output port output termination AD sampling chip's AD sampling port, an output cross -over connection feedback resistance R6 still and between the reverse input end behind operational amplifier's the syntropy input series resistance R2. Through adopting invariable reference voltage as operational amplifier's reference voltage, improve accuracy and reliability that the current acquisition circuit electric current was gathered, for battery management system provides safeguard to the control that the battery is real -time, accurate, increase the battery and be the security that electric automobile supplied power.
Description
Technical field
The utility model relates to batteries of electric automobile administrative skill field, is specifically related to a kind of current collection circuit.
Background technology
Electric automobile commercially obtains the favor of increasing consumer, and is the electric automobile most important factor affecting electric automobile and further develop that provides the battery of power to become.In order to ensure cell safety, efficiently for electric automobile is powered, need the duty by battery management system Real-Time Monitoring battery, such as, need the voltage, electric current, temperature etc. that detect battery in real time.In prior art, the electric current that battery management system gathers electric battery adopts independently circuit realiration respectively with collection battery cell voltage, so in prior art, the circuit of battery management system is complicated.In addition, the input voltage source gathering the input end in the same way of operational amplifier in the current collection circuit of battery pack current in prior art easily mixes clutter, thus cause gather current data inaccurate, reliability is low, and then affect battery management system battery is controlled in real time, accurately, adding battery is that electric automobile is powered the danger existed.
Utility model content
The purpose of this utility model overcomes shortcomings and deficiencies of the prior art, provides a kind of current collection circuit, adopts constant reference voltage as the reference voltage of operational amplifier, improves the accuracy of current collection circuit current acquisition.
The purpose of this utility model is achieved through the following technical solutions:
A kind of current collection circuit, comprise the first filtering circuit, operational amplifier and AD sampling A/D chip, positive current collection terminal I+ and negative current collection terminal I-is connected across electrode input end and the negative input of the first filtering circuit respectively; Be connected to the input end in the same way of operational amplifier after the cathode output end resistance in series R4 of the first filtering circuit, after cathode output end resistance in series R8, be connected to the reverse input end of operational amplifier; Be connected to the reference voltage output end mouth of AD sampling A/D chip after the resistance in series R2 of input end in the same way of operational amplifier, export the AD sample port of termination AD sampling A/D chip, output terminal cross-over connection one feedback resistance R6 also and between reverse input end.
As preferably, described AD sampling A/D chip is LTC6804 chip.
As preferably, the resistance of described resistance R4 equals the resistance of resistance R8, and the resistance of resistance R2 equals the resistance of resistance R6.
As preferably, described first filtering circuit comprises resistance R3, resistance R7, electric capacity C8 and electric capacity C9, a termination positive current collection terminal I+ of resistance R3, ground connection after other end series capacitance C8, composition the one RC filter unit; The one termination negative current collection terminal I-of resistance R7, ground connection after other end series capacitance C9, composition the 2nd RC filter unit.
As preferably, described first filtering circuit also comprises the electric capacity C5 be connected across between a RC filter unit output terminal and the 2nd RC filter unit output terminal.
As preferably, the resistance of described resistance R3 equals the resistance of resistance R7.
As preferably, the output terminal of described operational amplifier is connected and is met the AD sample port GPIO1 of AD sampling A/D chip after the second filtering circuit.
As preferably, described second filtering circuit is RC filtering circuit.
As preferably, described second filtering circuit comprises resistance R5, electric capacity C6 and electric capacity C7, the output terminal of described resistance R5 mono-termination operational amplifier, one end after another termination capacitor C6 is in parallel with electric capacity C7, meet the AD sample port GPIO1 of AD sampling A/D chip, the other end ground connection after electric capacity C6 is in parallel with electric capacity C7 simultaneously.
As preferably, the power input of described operational amplifier connects one end of filter capacitor C4, connects the VREG energization pins of LTC6804 chip simultaneously, shares a power supply, the other end ground connection of filter capacitor C4 with LTC6804 chip.
The utility model comprises following advantage and beneficial effect compared to existing technology:
The utility model will be connected to the reference voltage output end mouth of AD sampling A/D chip after the resistance in series R2 of input end in the same way of operational amplifier, by adopting constant reference voltage as the reference voltage of operational amplifier, improve accuracy and the reliability of current collection circuit current acquisition, for battery management system controls to provide safeguard to battery in real time, accurately, increasing battery is the security that electric automobile is powered.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the utility model embodiment.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited thereto.
Embodiment
As shown in Figure 1, a kind of current collection circuit, comprises the first filtering circuit, operational amplifier and AD sampling A/D chip, and positive current collection terminal I+ and negative current collection terminal I-is connected across electrode input end and the negative input of the first filtering circuit respectively; Be connected to the input end in the same way of operational amplifier after the cathode output end resistance in series R4 of the first filtering circuit, after cathode output end resistance in series R8, be connected to the reverse input end of operational amplifier; Be connected to the reference voltage output end mouth of AD sampling A/D chip after the resistance in series R2 of input end in the same way of operational amplifier, export the AD sample port of termination AD sampling A/D chip, output terminal cross-over connection one feedback resistance R6 also and between reverse input end.In the present embodiment, described AD sampling A/D chip is LTC6804 chip.The resistance of described resistance R4 equals the resistance of resistance R8, and the resistance of resistance R2 equals the resistance of resistance R6.The VREF2 pin of LTC6804 chip is connected to after the resistance in series R2 of input end in the same way of described operational amplifier.The power input of operational amplifier connects one end of filter capacitor C4, connects the VREG energization pins of LTC6804 chip simultaneously, the other end ground connection of filter capacitor C4.Operational amplifier and LTC6804 chip share a power supply, and electric capacity C4 is power supply filtering, and circuit structure is simple, reliability is high.
In the present embodiment, described first filtering circuit comprises resistance R3, resistance R7, electric capacity C8, electric capacity C9 and electric capacity C5, a termination positive current collection terminal I+ of resistance R3, ground connection after other end series capacitance C8, composition the one RC filter unit; The one termination negative current collection terminal I-of resistance R7, ground connection after other end series capacitance C9, composition the 2nd RC filter unit, described electric capacity C5 is connected across between a RC filter unit output terminal and the 2nd RC filter unit output terminal.The resistance of described resistance R3 equals the resistance of resistance R7.By the clutter of two RC filter units difference filtering positive current collection terminal I+ and negative current collection terminal I-of the first filtering circuit, improve the accuracy of current acquisition data; Be carried in the clutter of positive current collection terminal I+ and negative current collection terminal I-by electric capacity C5 filtering, improve the accuracy of current acquisition data further.
In the present embodiment, the output terminal of described operational amplifier is connected and is met the AD sample port GPIO1 of AD sampling A/D chip after the second filtering circuit.In the present embodiment, described second filtering circuit is RC filtering circuit.Described second filtering circuit comprises resistance R5, electric capacity C6 and electric capacity C7, the output terminal of described resistance R5 mono-termination operational amplifier, one end after another termination capacitor C6 is in parallel with electric capacity C7, meet the AD sample port GPIO1 of AD sampling A/D chip simultaneously, other end ground connection after electric capacity C6 is in parallel with electric capacity C7, by the signal of the second filtering circuit filtering after operational amplifier amplifies, improve the accuracy of current acquisition data further.
The above embodiment only have expressed embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (10)
1. a current collection circuit, is characterized in that: comprise the first filtering circuit, operational amplifier and AD sampling A/D chip, and positive current collection terminal I+ and negative current collection terminal I-is connected across electrode input end and the negative input of the first filtering circuit respectively; Be connected to the input end in the same way of operational amplifier after the cathode output end resistance in series R4 of the first filtering circuit, after cathode output end resistance in series R8, be connected to the reverse input end of operational amplifier; Be connected to the reference voltage output end mouth of AD sampling A/D chip after the resistance in series R2 of input end in the same way of operational amplifier, export the AD sample port of termination AD sampling A/D chip, output terminal cross-over connection one feedback resistance R6 also and between reverse input end.
2. current collection circuit according to claim 1, is characterized in that: described AD sampling A/D chip is LTC6804 chip.
3. current collection circuit according to claim 1, is characterized in that: the resistance of described resistance R4 equals the resistance of resistance R8, and the resistance of resistance R2 equals the resistance of resistance R6.
4. current collection circuit according to claim 1, it is characterized in that: described first filtering circuit comprises resistance R3, resistance R7, electric capacity C8 and electric capacity C9, the one termination positive current collection terminal I+ of resistance R3, ground connection after other end series capacitance C8, composition the one RC filter unit; The one termination negative current collection terminal I-of resistance R7, ground connection after other end series capacitance C9, composition the 2nd RC filter unit.
5. current collection circuit according to claim 4, is characterized in that: described first filtering circuit also comprises the electric capacity C5 be connected across between a RC filter unit output terminal and the 2nd RC filter unit output terminal.
6. current collection circuit according to claim 4, is characterized in that: the resistance of described resistance R3 equals the resistance of resistance R7.
7. current collection circuit according to claim 1, is characterized in that: the output terminal of described operational amplifier is connected and met the AD sample port GPIO1 of AD sampling A/D chip after the second filtering circuit.
8. current collection circuit according to claim 7, is characterized in that: described second filtering circuit is RC filtering circuit.
9. current collection circuit according to claim 8, it is characterized in that: described second filtering circuit comprises resistance R5, electric capacity C6 and electric capacity C7, the output terminal of described resistance R5 mono-termination operational amplifier, one end after another termination capacitor C6 is in parallel with electric capacity C7, meet the AD sample port GPIO1 of AD sampling A/D chip, the other end ground connection after electric capacity C6 is in parallel with electric capacity C7 simultaneously.
10. current collection circuit according to claim 2, it is characterized in that: the power input of described operational amplifier connects one end of filter capacitor C4, connect the VREG energization pins of LTC6804 chip simultaneously, share a power supply with LTC6804 chip, the other end ground connection of filter capacitor C4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520878222.3U CN205157638U (en) | 2015-11-03 | 2015-11-03 | Current acquisition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520878222.3U CN205157638U (en) | 2015-11-03 | 2015-11-03 | Current acquisition circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205157638U true CN205157638U (en) | 2016-04-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520878222.3U Expired - Fee Related CN205157638U (en) | 2015-11-03 | 2015-11-03 | Current acquisition circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205157638U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107589293A (en) * | 2017-09-11 | 2018-01-16 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of current sampling circuit |
| CN111722004A (en) * | 2019-03-19 | 2020-09-29 | 上海度普新能源科技有限公司 | Acquisition circuit based on shunt |
-
2015
- 2015-11-03 CN CN201520878222.3U patent/CN205157638U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107589293A (en) * | 2017-09-11 | 2018-01-16 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of current sampling circuit |
| CN111722004A (en) * | 2019-03-19 | 2020-09-29 | 上海度普新能源科技有限公司 | Acquisition circuit based on shunt |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160413 Termination date: 20191103 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |