CN108539821A - A kind of power-supply management system and charging and discharging currents sample-taking calculating circuit - Google Patents
A kind of power-supply management system and charging and discharging currents sample-taking calculating circuit Download PDFInfo
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- CN108539821A CN108539821A CN201810396297.6A CN201810396297A CN108539821A CN 108539821 A CN108539821 A CN 108539821A CN 201810396297 A CN201810396297 A CN 201810396297A CN 108539821 A CN108539821 A CN 108539821A
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- 238000007599 discharging Methods 0.000 title claims abstract description 27
- 239000004065 semiconductor Substances 0.000 claims abstract description 28
- 238000005070 sampling Methods 0.000 claims abstract description 10
- 230000003321 amplification Effects 0.000 claims description 16
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 16
- 230000008771 sex reversal Effects 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 7
- 230000003750 conditioning effect Effects 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims 1
- 230000001143 conditioned effect Effects 0.000 abstract description 3
- 230000005764 inhibitory process Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 108091006146 Channels Proteins 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 102220067365 rs143592561 Human genes 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0024—Parallel/serial switching of connection of batteries to charge or load circuit
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- H02J7/0021—
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
A kind of power-supply management system and charging and discharging currents sampling meter circuit are proposed in the present invention, including charger, charging metal-oxide-semiconductor, accumulator group, current divider, electric discharge metal-oxide-semiconductor, load, modulate circuit, MCU module, wherein charger, charging metal-oxide-semiconductor, accumulator group, current divider constitutes charge circuit；Accumulator group, current divider, load constitute discharge loop；Current divider, modulate circuit, MCU module are sequentially connected in series；Output digit signals and analog signal after the conditioned processing of circuit of charging and discharging currents signal, current polarity is can determine whether according to digital signal, according to analog signal can calculating current size, error can be reduced using instrument amplifier in modulate circuit, improve common mode inhibition capacity, after modulate circuit, charging current output signal is within the scope of [0,5] V, and the output signal of discharge current is also [0,5] within the scope of V, the resolution requirement to AD converter is reduced.
Description
Technical field
The present invention relates to power-supply management system fields more particularly to the sampling of power-supply management system charging and discharging currents to calculate electricity
Road.
Background technology
In some applications when there is external power supply to have electricity, external power supply provides power supply for load, while passing through charger
For battery charging, when external power supply is without electricity, accumulator group provides power supply for load.This just needs to be online accumulator group
Charging and discharging, the current charge excessively of accumulator group, overcurrent electric discharge may influence the service life of accumulator group, in some instances it may even be possible to safety occur
（Especially lithium ion battery）Problem needs to cut off charge or discharge time in time when current charge occurring or overcurrent is discharged
Road.The charging and discharging currents of accumulator group are also an important parameter of calculating accumulator group residual capacity, therefore accurate detection stores
The charging and discharging currents of battery pack are extremely important., can also be to the voltage of battery in power-supply management system, the carry out such as temperature are real-time
Detection, communicates the status information of accumulator group with system host computer, real-time display by way of bus.
Currently, battery current detection main method has：Utilize current sensor（Current divider or hall device）
Current signal is converted to voltage signal, is amplified to voltage signal, after conditioning, using being counted after AD converter sampled voltage signal
Calculate size of current.Acquire the charging and discharging electric current of accumulator group, it is necessary to it is transformed bipolar to acquire current sensor
Property voltage signal, but most of Embedded A/D converter can only acquire positive signal at present, when acquire bipolar signal, need
Bipolar signal be converted to positive signal using adder, then be acquired with AD converter, calculated.
The charging and discharging currents codomain of accumulator group can be inconsistent in actual use, such as when lithium ion battery charging
General charging current is less than 1C, and discharge current can be more than 5C and discharge when discharging, the threshold range of battery current be [- 5C,
1C]（Electric discharge is negative current, is charged as positive current）, using add circuit, when selection reference power supply is 4.1667, current threshold [-
5C, 1C] it is corresponding with [0,5] V of 5V Embedded A/D converters, i.e., corresponding current is -5C when voltage is 0V, and voltage is
4.1667V corresponding currents are 0A, and corresponding current is 1C when voltage is 5V.[4.1667,5] V of electric current [0,1C] and AD converter
Corresponding, the 1/6 of the codomain ranging from 5V systems of electric current in charging current detection just needs to improve AD to improve accuracy
The resolution ratio of converter.
Invention content
To solve the above-mentioned problems, a kind of power-supply management system and charging and discharging currents sampling meter circuit are proposed in the present invention.
A kind of power-supply management system and charging and discharging currents sampling meter circuit, including charger, charging metal-oxide-semiconductor, accumulator group,
Current divider, electric discharge metal-oxide-semiconductor, load, modulate circuit, MCU module, the charger, charging metal-oxide-semiconductor, accumulator group, current divider
Constitute charge circuit；The accumulator group, current divider, load constitute discharge loop；The current divider, modulate circuit, MCU
Module is sequentially connected in series；The MCU module is connected in series with charging metal-oxide-semiconductor, the break-make of control charging metal-oxide-semiconductor；Described
MCU module is connected in series with electric discharge metal-oxide-semiconductor, the break-make of control electric discharge metal-oxide-semiconductor.
It is 0 that the modulate circuit, which includes filter circuit, first order differential amplifier circuit, positive voltage amplification negative voltage exports
Circuit, the output of negative voltage amplifying stage sex reversal positive voltage are 0 circuit, comparison circuit, RC filter circuits；The voltage at current divider both ends
Difference connection filter circuit input terminal；Filter circuit output end connects first order differential amplifier circuit input terminal；First order difference is put
Big circuit output end is separately connected the input terminal of comparator, positive voltage amplification negative voltage output is 0 circuit input end, negative electricity presses
Big polarity reversion positive voltage output is 0 circuit input end；IO low and high levels detection in the output end connection MCU module of comparator
Module；Positive voltage amplification negative voltage output is 0 circuit and the output end that the output of negative voltage amplifying stage sex reversal positive voltage is 0 circuit
Embedded AD converter module after parallel connection after RC filter circuits in connection MCU module.
Preferably, the first order differential amplifier circuit uses dual power supply instrument amplifier, improves input impedance, improves
Common-mode rejection ratio.
Preferably, the output of positive voltage amplification negative voltage is 0 circuit, the output of negative voltage amplifying stage sex reversal positive voltage is 0 electricity
2 channel operation amplifier of dual power supply is used in road, it is 0 circuit, negative voltage amplifying stage sex reversal that positive voltage, which amplifies negative voltage output,
Positive voltage output is that 0 circuit uses one of channel respectively.Positive voltage of the first order differential amplifier circuit after parallel connection
Amplification negative voltage output is 0 circuit, the output of negative voltage amplifying stage sex reversal positive voltage is to export always positive polarity voltage after 0 circuit
Signal；It is 0 circuit that positive voltage, which amplifies negative voltage to export, the output of negative voltage amplifying stage sex reversal positive voltage is times magnification in 0 circuit
Number can be different, can be respectively according to practical adjustment, and signal when making charging after electric current conversion is within the scope of [0,5] V, when electric discharge
Signal after electric current conversion is also within the scope of [0,5] V.
Further, the output signal of first order differential amplifier circuit is judged by comparing circuit compared with 0V voltages
The polarity of voltage.
Further, the current divider uses high-accuracy current divider.
Preferably, the MCU module uses integrated chip, carries AD converter module, and low and high level detects IO outputs
Mouth and low and high level output control I/O port.
The beneficial effects of the present invention are：
（1）Be capable of precise acquisition accumulator group charging current and meanwhile discharge current can also be acquired, use instrument amplifier with
And filter circuit, while error can be reduced, improve acquisition precision and common mode inhibition capacity.
（2）It can make the output signal after the conditioned circuit of charging current within the scope of [0,5] V, while discharge current passes through
Output signal after modulate circuit is also within the scope of [0,5] V.Reduce the resolution requirement to AD converter.
（3）It is versatile, the charging and discharging currents of accumulator group and the Bipolar current value of various equipment can be handled.
Description of the drawings
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the structural schematic diagram of modulate circuit.
Specific implementation mode
As shown in Figure 1, a kind of battery management system charging and discharging currents sample-taking calculating circuit and control method, including charging
Machine 1, charging metal-oxide-semiconductor 2, accumulator group 3, current divider 4, electric discharge metal-oxide-semiconductor 5, load 6, modulate circuit 7, MCU module 8.Described fills
Motor, charging metal-oxide-semiconductor, accumulator group, current divider constitute charge circuit.The accumulator group, current divider constitute discharge loop.
The current divider, modulate circuit, MCU module are sequentially connected in series.The MCU module is connected in series with charging metal-oxide-semiconductor, is controlled
The break-make of system charging metal-oxide-semiconductor.The MCU module is connected in series with electric discharge metal-oxide-semiconductor, the break-make of control electric discharge metal-oxide-semiconductor.Described
Current divider is using accurate current divider.
Wherein, as shown in Fig. 2, modulate circuit includes filter circuit 10, first order differential amplifier circuit 11, positive voltage amplification
Negative voltage output is 0 circuit 13, the output of negative voltage amplifying stage sex reversal positive voltage is 0 circuit 14, comparison circuit 16 and RC filtering
Circuit 15.The voltage difference at current divider both ends connects filter circuit input terminal.Filter circuit output end connects first order differential amplification
Circuit input end.It is defeated that first order differential amplifier circuit output end is separately connected the input terminal of comparator, positive voltage amplification negative voltage
It is 0 circuit input end to go out for 0 circuit input end, the output of negative voltage amplifying stage sex reversal positive voltage.The output end of comparator connects
IO low and high level detection modules in MCU module.It is 0 circuit and negative voltage amplifying stage sex reversal that positive voltage, which amplifies negative voltage output,
Positive voltage output be 0 circuit output end parallel connection after through RC filter circuits connect MCU module in embedded AD converter module.Its
Middle R1, R2, R7, R9, R10, R12, R13 are high-accuracy resistance.
The work process of the present invention is as follows：
When external power supply has electricity, electric discharge metal-oxide-semiconductor 5 disconnects, and external power supply is directly 6 power supply of load, is also turned on charging metal-oxide-semiconductor
2, charger constant current is battery charging, and after fully charged, it is accumulator group floating charging that charger, which is converted to constant pressure,.Work as outside
When power supply is without electricity, electric discharge metal-oxide-semiconductor 5 is connected, accumulator group is 6 power supply of load.When detecting during charging and discharging
When overcurrent, MCU module 8 cuts off corresponding charging and discharging metal-oxide-semiconductor in time.
During charge and discharge, electric current passes through current divider 4, and current divider samples both ends and generates voltage difference, by conditioning electricity
The analog signal of 0V-5V, and the low and high level digital signal of characterization charge or discharge are exported behind road, are counted by MCU module 8
Accurate charging and discharging currents value is obtained after calculation processing.
The modulate circuit design scheme of the present invention is as follows：
Charging and discharging currents in accumulator group charging and discharging circuit are converted to micro voltage signal by current divider, and micro voltage signal is connected to
The input terminal 9 of modulate circuit in Fig. 2.There are two types of connection types with input circuit in Fig. 2 for current divider sampled point.1, adopting in Fig. 1
Sampling point 4A is connect with the BATIF- in Fig. 2, and 4B is connect with the BATIF+ in Fig. 2.2, in the sampled point 4A and Fig. 2 in Fig. 1
BATIF+ connections, 4B connect with the BATIF- in Fig. 2.Two different connection types make in Fig. 2 modulate circuits Vin with
The polarity of Vo1 is on the contrary, comparison circuit output low and high level is opposite.Current value is positive value when charging, and current value is negative when electric discharge
The resistance value of value, current divider sampled point both ends is R0, is illustrated by taking connection type 1 as an example.The input terminal voltage of Fig. 2 modulate circuits
For：
Vin = -I×R0
It is put as shown in Fig. 2, being input to the first order difference being made of instrument amplifier after the filtered circuit filtering of Vin signals 10
Big circuit 11, by K times（Amplification factor K is related with R9 in Fig. 2, and K is positive value）Output voltage is after amplification：
Vo1 = -K×Vin = K×I×R0
As shown in Fig. 2, Vo1 by comparison circuit 16 and 0 voltage relatively after export Vo3, when Vo1 is positive polarity, output Vo3 is
High level, when Vo1 is negative polarity, output Vo3 is low level.I.e. when battery charging, Vo3 is high level, works as electric power storage
Vo3 is low level when the group electric discharge of pond.The IO low and high level detection modules that V03 is input in MCU module 8 judge that accumulator group is to fill
Electricity or electric discharge.
As shown in Fig. 2, the positive voltage amplification negative voltage output that Vo1 passes through parallel connection is 0 circuit 13, negative voltage amplification polarity is anti-
Voltage output of becoming a full member is output analog signal Vo2 after 0 circuit 14 and output RC filter circuits.
As shown in Fig. 2, the positive voltage amplification negative voltage output that Vo1 passes through parallel connection is 0 circuit 13, negative voltage amplification polarity is anti-
Voltage output of becoming a full member is output analog signal Vo2 after 0 circuit 14 and output RC filter circuits.
As shown in Fig. 2, when charging, Vo2 is：
Vo2 = Vo1×（R1/R2）= K×I×R0×（R1/R2）
As shown in Fig. 2, upon discharging, choosing R10=R12, R7=R13, Vo2 are：
Vo2 = |Vo1×（R7/R10）|= |K×I×R0×（R7/R10）|
The signal Vo2 and Vo3 of conditioned circuit output are separately connected embedded AD conversion module and the inspection of IO low and high levels of MCU module
Module is surveyed, MCU computing modules go out the charging current and discharge current value of accumulator group according to the value COMPREHENSIVE CALCULATING of Vo2 and Vo3.
The present invention is not limited to the above embodiment, anyone can show that other are various forms of under the inspiration of the present invention
Product, however, make any variation in its shape or structure, it is every that there is scheme identical or similar to the present application, fall
Within protection scope of the present invention.
Claims (5)
1. a kind of power-supply management system and charging and discharging currents sampling meter circuit, including charger（1）, charging metal-oxide-semiconductor（2）, electric power storage
Pond group（3）, current divider（4）, electric discharge metal-oxide-semiconductor（5）, load（6）, modulate circuit（7）, MCU module（8）, it is characterised in that：It is described
Charger, charging metal-oxide-semiconductor, accumulator group, current divider constitute charge circuit；The accumulator group, current divider constitute electric discharge
Circuit；The current divider, modulate circuit, MCU module are sequentially connected in series；The MCU module is connected company with charging metal-oxide-semiconductor
It connects, the break-make of control charging metal-oxide-semiconductor；The MCU module is connected in series with electric discharge metal-oxide-semiconductor, the break-make of control electric discharge metal-oxide-semiconductor.
2. power-supply management system according to claim 1 and charging and discharging currents sampling meter circuit, feature：The conditioning
Accumulator group charging and discharging currents are converted to digital signal and analog signal, digital signal representation current polarity, simulation letter by circuit
Number size of current is represented, after modulate circuit, charging current output signal within the scope of [0,5] V, believe by the output of discharge current
Number also within the scope of [0,5] V.
3. power-supply management system according to claim 1 and charging and discharging currents sampling meter circuit, it is characterised in that：Described
Modulate circuit includes filter circuit（10）, first order differential amplifier circuit（11）, positive voltage amplification negative voltage output be 0 circuit
（13）, negative voltage amplifying stage sex reversal positive voltage output be 0 circuit（14）, comparison circuit（16）And RC filter circuits（15）；Point
The voltage difference for flowing device both ends connects filter circuit input terminal, and filter circuit output end connects the input of first order differential amplifier circuit
End；First order differential amplifier circuit output end is separately connected the input terminal of comparator, positive voltage amplification negative voltage output is 0 circuit
Input terminal, the output of negative voltage amplifying stage sex reversal positive voltage are 0 circuit input end；In the output end connection MCU module of comparator
IO low and high level detection modules；It is that 0 circuit and negative voltage amplifying stage sex reversal positive voltage are defeated that positive voltage, which amplifies negative voltage output,
Go out after the output end parallel connection for 0 circuit through the embedded AD converter module in RC filter circuits connection MCU module.
4. power-supply management system according to claim 1 and charging and discharging currents sampling meter circuit, it is characterised in that：Described
Current divider uses high-accuracy current divider.
5. power-supply management system according to claim 3 and charging and discharging currents sampling meter circuit, it is characterised in that：Described
First order differential amplifier circuit uses dual power supply instrument amplifier, improves input impedance, improves common-mode rejection ratio.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810396297.6A CN108539821A (en) | 2018-04-28 | 2018-04-28 | A kind of power-supply management system and charging and discharging currents sample-taking calculating circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810396297.6A CN108539821A (en) | 2018-04-28 | 2018-04-28 | A kind of power-supply management system and charging and discharging currents sample-taking calculating circuit |
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| CN108539821A true CN108539821A (en) | 2018-09-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| CN1971302A (en) * | 2005-11-24 | 2007-05-30 | 比亚迪股份有限公司 | Inverter of voltage polarity, detecting circuit and method of charge and discharge current of battery |
| CN104897953A (en) * | 2015-01-30 | 2015-09-09 | 中天储能科技有限公司 | Accurate lithium battery BMS system charging and discharging current sampling and calculation circuit and control method |
| CN205656227U (en) * | 2016-03-08 | 2016-10-19 | 武汉合康智能电气有限公司 | On -vehicle motor output current sampling circuit that fills |
| CN106411250A (en) * | 2016-11-30 | 2017-02-15 | 合肥源擎电气科技有限公司 | Co-cathode photovoltaic controller system |
| CN206564486U (en) * | 2017-03-09 | 2017-10-17 | 合肥凌山新能源科技有限公司 | A kind of solar charging discharging controller |
-
2018
- 2018-04-28 CN CN201810396297.6A patent/CN108539821A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1971302A (en) * | 2005-11-24 | 2007-05-30 | 比亚迪股份有限公司 | Inverter of voltage polarity, detecting circuit and method of charge and discharge current of battery |
| CN104897953A (en) * | 2015-01-30 | 2015-09-09 | 中天储能科技有限公司 | Accurate lithium battery BMS system charging and discharging current sampling and calculation circuit and control method |
| CN205656227U (en) * | 2016-03-08 | 2016-10-19 | 武汉合康智能电气有限公司 | On -vehicle motor output current sampling circuit that fills |
| CN106411250A (en) * | 2016-11-30 | 2017-02-15 | 合肥源擎电气科技有限公司 | Co-cathode photovoltaic controller system |
| CN206564486U (en) * | 2017-03-09 | 2017-10-17 | 合肥凌山新能源科技有限公司 | A kind of solar charging discharging controller |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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Application publication date: 20180914 |