CN106329616A - Method for correcting electric quantity calculation of battery pack - Google Patents
Method for correcting electric quantity calculation of battery pack Download PDFInfo
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- CN106329616A CN106329616A CN201610655855.7A CN201610655855A CN106329616A CN 106329616 A CN106329616 A CN 106329616A CN 201610655855 A CN201610655855 A CN 201610655855A CN 106329616 A CN106329616 A CN 106329616A
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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
- H02J7/0014—Circuits for equalisation of charge between batteries
Abstract
The invention discloses a method for correcting electric quantity calculation of a battery pack. A circuit control system comprises an MCU correction module, a multipath comparator circuit, an NAND gate control circuit, a coulometer module, a battery pack protection module and a battery pack, wherein the battery pack protection module comprises the functions of balancing, over-discharging, over-charging, short-circuit protection and the like; the coulometer module is mainly used for calculating the electric quantity flowing through a sampling resistor of the protection module; the multipath comparator circuit is mainly used for awakening the MUC module when the protection module starts the balancing function and controlling the NAND gate control circuit when the balancing function is completely started to shunt charge current of a balancing circuit, so that one part of charge current does not flow through the sampling resistor of the coulometer module; and the MCU module is mainly used for correcting more electric quantity, consumed by a discharging resistor in the balancing circuit, calculated by a coulometer when the battery pack protection module starts the balancing function. According to the method for correcting the electric quantity calculation of the battery pack, the estimation accuracy of the electric quantity of batteries can be greatly improved, so that the electric quantity of the batteries can be fully developed and utilized.
Description
Technical field
The present invention relates to multiple batteries group application, a kind of for revising the method that battery electric quantity calculates.
Background technology
Along with the development of science and technology, people are increasingly wider, such as field movable storage battery, mobile charging to the use of battery
The portable equipments such as device, field camera and digital camera.And during the use of battery, people are usually single battery group
Synthesizing various volume and the set of cells of various capacity, meet the long playing demand of machine or equipment, people are the most urgent
Cut the dump energy wishing to know set of cells, thus calculate the use time of machine or equipment.
It is primarily present two kinds of methods on current battery products application to measure battery electric quantity, is broadly divided into voltage method and coulomb
Meter method.Voltage method is mainly the residual capacity speculating battery according to the voltage of battery, and the method precision is poor, it is impossible to reply electricity
Suddenly boosting and the unexpected blood pressure lowering situation in pond, the most slowly withdraws from the market.Coulometer method mainly uses coulometer chip to calculate
The residual capacity of battery, coulometer chip flows through the electric current of sampling resistor by collection, in conjunction with the characteristic of temperature and battery to electricity
The capacity in pond carries out learning and estimating, is the method for a kind of degree of precision measurement, is the main stream approach measuring battery capacity at present.
But owing to the sampling resistor of coulometer collection is typically connected on the front outfan of battery protecting plate or rear outfan, and set of cells exists
In charging process, protection board opens equalizaing charge, and the electricity of equalizing circuit internal resistance consumption also can be counted by coulometer,
So coulometer method is typically useful in above single battery or single storage battery, as the protection board on market and coulometer are typically all
Distribution.
Summary of the invention
It is an object of the invention to provide a kind of for revising the method that battery electric quantity calculates, be used for solving asking of coulometer
Topic.
Set of cells is in charging process, and first certain joint series-connected cell can reach to rush electro-detection voltage, corresponding protection board
On equalizing circuit start working, the switch mosfet pipe of this equilibrium branch road will be opened so that charging current is split a part
Consume on the resistance R of equalizing circuit.Before being typically connected on battery protecting plate due to the sampling resistor of coulometer collection defeated
Go out end or rear outfan, understand the electric current I flowing through coulometer sampling resistor according to Kirchhoff's current law (KCL)QEqual to electric current mistake
Battery current IcElectric current I with equalizing resistanceRSum, i.e. IQ=Ic+IR.The electricity Q that wherein equilibrium branch resistance consumesRIt it is coulomb
Meter need not to count.Set of cells is before completing charging, due to the characteristic of battery so that battery is set of cells during charging
The voltage that protection board is measured not is very accurate, so protection board equilibrium branch road still can turn on, until this branched battery voltage
When releasing voltage less than overcharge, equilibrium branch road is just closed, thus eliminates that each branched battery voltage is unbalanced to be brought to set of cells
Impact.The now electricity Q of resistance consumption in equilibrium branch roadRAlso it is that coulometer need not count.
Concretely comprise the following steps:
One, set up a circuit control system, control including a MCU correcting module, multichannel comparator circuit, NAND gate
Circuit, coulometer module, battery pack protection module and set of cells；Described set of cells is lithium battery or lead-acid battery；At battery
Equalizing circuit on group protection board increases comparator circuit and monitors whether equalizing circuit is opened, if there being equalizing circuit to open
, comparator wakes up MCU module up the most at once so that it is work；The operation principle of comparator is with equal the positive input terminal of comparator
The cell input terminal of weighing apparatus branch road connects, and the grid of the switch mosfet pipe of the negative input end of comparator branch road equilibrium with this connects,
The outfan of comparator has added pull-up resistor；Due to the positive input terminal of comparator and negative input end equal time, comparator output terminal
A labile state can be in, so simultaneously need to comparator positive input terminal connect access a resistance so that it is produce
One bias voltage, thus ensure this equilibrium branch road being not turned on when, positive input terminal is slightly less than negative input end, allows ratio
Relatively device output is in stable low level state；And when this equilibrium branch road is opened, negative input end is equal to the battery of this branch road
Input terminal voltage deducts the cell voltage of this branch road, then negative input end is far smaller than positive input terminal, and now comparator output terminal is defeated
Go out high level to wake up MCU module up；MCU module one wakes up up, be switched on intervalometer to calculate this equilibrium branch road open time, and
According to the time waken up up, calculate this equilibrium branch road and calculate the loss Q of electricityr；
Two, in charging process, when certain equilibrium branch road is first begin to work, according to electricity computing formula and electric current, electricity
The computing formula of pressure is learnt, the electricity formula calculating the loss of this equilibrium branch resistance isWhereinUt
For equalize branch resistance two ends voltage, R be equilibrium branch road resistance, Δ t be set of cells in charging process, this equilibrium branch road
It is opened to the calculating time that all of equilibrium branch road is all performed fighting；The electricity Q that this equilibrium branch road consumesrIt is that coulometer need not calculate
Enter, then the kwh loss that N-1 bar equilibrium branch road is opened is exactlyBut due to the electricity that equilibrium branch resistance is corresponding
Pressure URThe voltage U corresponding with coulometervccIt is unequal, UvccVoltage is more than UR, so before coulometer electricity correction to be carried out
Carry is that the electricity to equilibrium branch resistance loss carries out geometric ratio relation conversion, i.e.Q′r′It is that equilibrium branch resistance damages
The electricity Q of consumptionrCorresponding to the charge value of coulometer after conversion；Then the electricity of N-1 bar equilibrium branch resistance loss is corresponding to coulomb
The charge value of meter isAssume that the electricity that coulometer calculates is Q, then the of coulometer
Electricity correction is Q=Q-Q 'R′；
Three, in charging process, all of equilibrium branch road is switched on, but does not reaches charging at the voltage of set of cells and stop
During threshold values, charger continues to charge the battery；Now multichannel comparator circuit can by AND circuit produce one high
Level, in addition to informing the kwh loss that MCU stops calculating equilibrium branch road, also opens an other charging diverter branch so that
All electric currents of equilibrium branch resistance that flow through all without flow through the sampling resistor of coulometer, thus improve coulometer computational accuracy and
Alleviate the workload of MCU；Then the second time electricity correction of coulometer is to be completed by circuit；
Four, before set of cells is at full charge, if the cell voltage of equilibrium branch road releases voltage more than overcharge, protection
The equilibrium branch road of plate still can turn on, and battery is discharged by this branch road, during until cell voltage releases voltage less than overcharge, all
Weighing apparatus branch road just can be closed；When all equilibrium branch roads there being a branch road quit work, multichannel comparator circuit can by with door
Circuit produces a low level, informs that MCU starts to calculate the kwh loss of the equilibrium branch resistance after electric discharge terminates；According to upper
Stating, the kwh loss of single equilibrium branch road is converted to corresponding to the geometric ratio of coulometerN-1 bar branch road
Kwh loss beWherein Δ t be set of cells before completing charging and terminating, all equilibrium branch roads have
Article one, the calculating time that this branch road is closed closed by branch road；Assume that the electricity that coulometer calculates is Q, then coulometer third time electricity
Correction is Q=Q-Q "R″；
The formula that then coulometer revises electricity three times is: Q=Q-(Q 'R′+Q″R″)；Due to Q 'R′With Q "r″Computing formula one
Sample, thus set of cells complete charging excessively in, can directly use formulaThe calculating completed
Formula is the same, the electricity correction of coulometer, and Δ t now changes into equalizing the time that branch road is always on, deducts all equilibriums and props up
Road open-interval difference simultaneously；
Five, set of cells is during actually accomplishing charging, can be due to the impact of the internal resistance of cell, and the IC of protection board is in charging
In the case of electric current is equalized branch road shunting, can detect that equilibrium branch road two ends cell voltage is different, thereby result in IC output
Balanced control signal produce vibration；This oscillator signal can last till that equalizing circuit is opened, and battery both end voltage falls after rise little
Time eliminate, now battery is the most at full charge；The vibration of balanced control signal, can cause all equilibrium branch roads to be in the most same
Time open, the situation of closedown；The turgor difference charge along with battery due to the cycle of equilibrium oscillator signal and different, it is
Changing, so cause all equilibrium branch roads in the case of opening, closing the most simultaneously, the last item equilibrium branch road is beaten always
The order opened is uncertain, random；In order to eliminate by the impact of protection board IC output Balance route oscillator signal, need
MCU records the time that all equilibrium branch roads are opened respectively, the overlapping cross events opened together with all equilibrium branch roads, institute's record
Equilibrium time of opening of branch road deduct the overlapping cross events that all equilibrium branch roads are all opened, this is equal to be the many calculating of coulometer
The time of the electricity that weighing apparatus branch resistance consumes；So under the influence of equilibrium oscillator signal, equilibrium branch road disappears corresponding to coulometer
The electricity of consumption can use formulaRepresent, then N bar equilibrium branch road isWherein Δ t is this
The time t that equilibrium branch road is opened1, the time t that deducts2Difference；Then MCU module is in the case of equilibrium oscillator signal impact, repaiies
The formula of positive coulometer electricity is
Six, assume that the time having an equilibrium branch road vibration is 0, then have the N bar of vibration impact in N bar vibration branch road
Equilibrium branch road calculates the correction formula of electricity to coulometerImpact of not vibrating can be changed into
N-1 equilibrium branch road calculates the correction formula of electricity to coulometerSet of cells completes charging
During, MCU can be directly with the formula having vibration impactComplete repairing of coulometer electricity
Just calculate.
The most relatively, the method that the present invention calculates for revising battery electric quantity can effectively solve protection board
The electricity of equalizing circuit internal resistance consumption calculate, to coulometer, the impact that causes, greatly improve the calculating essence of coulometer
Degree, enables users to adequately and reasonably use set of cells, and then indirectly extends the service life of set of cells.
Accompanying drawing explanation
The circuit structure frame diagram of Fig. 1 present invention.
The equalizing circuit schematic diagram of the interpolation single channel comparator of Fig. 2 present invention.
The equalizing circuit schematic diagram of the interpolation 4 road comparator of Fig. 3 present invention.
Fig. 4 present invention does not has electricity correction and has the relativity schematic diagram of electricity correction.
Figure is labeled as: 1-MCU correcting module, 2-multichannel comparator circuit, 3-NAND gate control circuit, 4-coulometer mould
Block, 5-battery pack protection module, 6-set of cells.
Detailed description of the invention
Embodiment:
It is a kind of circuit structure frame diagram for revising the method that battery electric quantity calculates shown in Fig. 1, this circuit structure
Frame diagram mainly includes a MCU correcting module 1, multichannel comparator circuit 2, NAND gate control circuit 3, coulometer module 4, electricity
Pond group protection module 5 and set of cells 6.
Fig. 2 is the single channel citing of the equalizing circuit combination of the multichannel comparator described in Fig. 1 and battery pack protection module, i.e. adds
Add the equalizing circuit of single channel comparator.The equalizing circuit of interpolation single channel comparator mainly includes single battery VC1, and (V6 and V7 is also
Connection), balanced discharge resistance R9, biasing resistor R4, pull-up resistor R3, equilibrium switch mosfet pipe M4 and comparator U1A.Wherein by
The equilibrium branch road of VC1, R9 and M4 composition protection board, R4, R3 and U1A are the electronic components of single channel comparator.VC1 is in not charging
Time, the battery balanced control pin (CB1 end) of protection board is output as low level, and M4 is not turned on.Wherein R4 is much larger than R9 so that
U1A_5 terminal voltage is less than U1A_4 end, and therefore U1A end output low level, i.e. OUT1 are that low level is high.When VC1 is in charging, its
When voltage exceedes equilibrium detection voltage threshold, the level signal upset of the battery balanced control pin (CB1 end) of protection board, open
M4 switching tube, equalization function starts, and the charging current of VC1 is split.Now it is carried in the voltage above R9 and approximates battery VC1
The voltage at two ends, the voltage of comparator U1A_5 end approximates the voltage of VCC1 end, and the voltage of U1A_4 end then subtracts equal to VCC1
Remove the voltage of VC1 battery-end, so U1A_5 terminal voltage is more than U1A_4 end.Now comparator U1A then exports high level and wakes up MCU up
Module, MCU module starts timing.According to described before, MCU during set of cells completes charging, the electricity to resistance R9
Loss calculation formula isWhereinΔt1It is time of opening of this equilibrium branch road, deducts institute
There is the difference equalizing the time that branch road is all opened.QrThe geometric ratio conversion of corresponding coulometer isUvccFor coulometer
Corresponding magnitude of voltage.
With reference to Fig. 2, it is known that the circuit structure of Fig. 3 is made up of 4 tunnel single channel comparators and single-unit equalizing circuit, and each road is all
It is separate, and circuit has also added NAND gate (U2A) control circuit.As seen from the figure, when all of equalizing circuit
When all opening, i.e. OUT1 to OUT4 be all high level time, U2A just can export high level, just can be bypass switch mosfet pipe
(M5) opening, now M4 switching tube is closed, then the flow direction of electric current is to flow to change from original M4, R14 (dotted arrow 1 Fig. 2)
For flowing to M5 (dotted arrow 2 in Fig. 2).In conjunction with Fig. 1, if the sampling resistor R of coulometer module during R14 is Fig. 1 in Fig. 3, then
When all equalizing circuits are all opened, all electric currents of equilibrium branch resistance that flow through are all without flow through the sampling electricity of coulometer module
Resistance, the most now electricity calculating of coulometer can eliminate the error caused by equalizing resistance.
The resistance (R3, R6, R9, R12) assuming all equilibrium branch roads in Fig. 3 is all 10 Europe, and R14 is coulometer mould in Fig. 1
The sampling resistor R of block, the virtual voltage of equilibrium branch road correspondence battery is 3.94v, and full range voltage is 4.20V, and actual capacity is
6306mah, theoretical capacity is 8000mah, and the virtual voltage of the sampling resistor R14 correspondence set of cells of coulometer module is
15.76v, full range voltage is 16.80V, and actual capacity is 6306mah, and theoretical capacity is 8000mah.Then Fig. 4 is above
On the basis of the experiment respectively following three situation done: 1) equalizing circuit do not added multichannel comparator and MCU correcting module
Set of cells is charged 15 hours.2) equalizing circuit is only added multichannel comparator, and the set of cells not adding MCU correcting module is entered
Row charging 15 hours.3) set of cells that equalizing circuit with the addition of multichannel comparator and MCU correcting module is charged 15 hours.
Fig. 4, the curve without revising is that equalizing circuit no interpolation multichannel comparator is corresponding with the set of cells of MCU correcting module
Graph of a relation.It increases along with the increase in charging interval, reading the most always, the trend of curve also Cheng Shangsheng, but after within 14 hours, getting over,
What curve became the most slowly rises.Because the main source of error of coulometer reading is its many calculating equilibrium branch resistance consumption always
Electricity, the time is the most long, calculates the most.And set of cells arrives below, battery rushes more and more fuller, the charged electrical of charger
Flow more and more less, then the current value that equilibrium branch road consumes is more and more less.This tested through 15 hours, the reading of coulometer
Being 10721mAh, relative theory value 8000mAh, its error coefficient is 34%.
Shown in Fig. 4, the curve only adding comparator correction is that equalizing circuit only adds multichannel comparator, and does not adds MCU and repair
The graph of a relation that just set of cells of module is corresponding.Set of cells is in charging process, and the reading of coulometer can increase always, but 13
Within about individual hour, starting to tend to mild, be primarily due to increase over time, it is full that the battery of equilibrium branch road rushes the most gradually, electricity
Pond both end voltage falls after rise and little when equalizing branch road and opening, and the IC oscillator signal of protection board starts to reduce, and so flows through equilibrium
The electric current of branch resistance, the sampling resistor flowing through coulometer less and less, so the reading of coulometer is more and more steady.This is real
Testing through 15 hours, the reading of coulometer is 9645mAh, and error coefficient is 20.56%.
Shown in Fig. 4, adding the curve that comparator and MCU revise is to the addition of multichannel comparator in equalizing circuit and MCU repaiies
The graph of a relation that just set of cells of module is corresponding.Set of cells is after charging 3 hours, and the coulometer reading of correction can't be as above-mentioned two
Experiment increases like that, the most steady.It is primarily due to MCU when single equilibrium branch road is opened, begins to the reading to coulometer
Number is modified, thus cumulative error is smaller.In experimentation, the oscillator signal that equalizing circuit produces, ratio can be caused equally
Relatively device and the vibration of NAND gate control circuit, MCU module starts time and the NAND gate control electricity of vibration by calculating 4 road comparators
The time of vibration is opened on road, eliminates the impact of Balance route oscillator signal.This experiment was through 15 hours, and coulometer is now
Reading is 9645mAh, eliminates the impact of Balance route oscillator signal, and 4 tunnels equilibrium times of opening respectively of branch roads that MCU obtains are
4.73h, 4.42h, 5h, 3.58h.The parameter known before above-mentioned data and experiment, substitute into above-mentioned elimination equilibrium vibration letter respectively
Number impact formulaCarry out the charge value correction of coulometer.After correction, the value of coulometer is
7773mah, differs 2.82% with theoretical 8000mah, will be much smaller than the error of above-mentioned two experiments.
In sum, the method being used for revising battery electric quantity calculating of the present invention, can improve battery electric quantity greatly
Estimation precision so that battery electric quantity can give full play to and utilize.
Claims (1)
1. one kind is used for revising the method that battery electric quantity calculates, it is characterised in that concretely comprise the following steps:
One, set up a circuit control system, control electricity including a MCU correcting module, multichannel comparator circuit, NAND gate
Road, coulometer module, battery pack protection module and set of cells；Described set of cells is lithium battery or lead-acid battery；In set of cells
Equalizing circuit on protection board increases comparator circuit and monitors whether equalizing circuit is opened, if there being equalizing circuit to open
, comparator wakes up MCU module up the most at once so that it is work；The operation principle of comparator is with equal the positive input terminal of comparator
The cell input terminal of weighing apparatus branch road connects, and the grid of the switch mosfet pipe of the negative input end of comparator branch road equilibrium with this connects,
The outfan of comparator has added pull-up resistor；Due to the positive input terminal of comparator and negative input end equal time, comparator output terminal
A labile state can be in, so simultaneously need to comparator positive input terminal connect access a resistance so that it is produce
One bias voltage, thus ensure this equilibrium branch road being not turned on when, positive input terminal is slightly less than negative input end, allows ratio
Relatively device output is in stable low level state；And when this equilibrium branch road is opened, negative input end is equal to the battery of this branch road
Input terminal voltage deducts the cell voltage of this branch road, then negative input end is far smaller than positive input terminal, and now comparator output terminal is defeated
Go out high level to wake up MCU module up；MCU module one wakes up up, be switched on intervalometer to calculate this equilibrium branch road open time, and
According to the time waken up up, calculate this equilibrium branch road and calculate the loss Q of electricityr；
Two, in charging process, when certain equilibrium branch road is first begin to work, according to electricity computing formula and electric current, voltage
Computing formula is learnt, the electricity formula calculating the loss of this equilibrium branch resistance isWhereinUtFor all
Weighing apparatus branch resistance two ends voltage, R be equilibrium branch road resistance, Δ t be set of cells in charging process, this equilibrium branch road is opened
The calculating time all performed fighting to all of equilibrium branch road；The electricity Q that this equilibrium branch road consumesrIt is that coulometer need not count
, then the kwh loss that N-1 bar equilibrium branch road is opened is exactlyBut due to the voltage U that equilibrium branch resistance is correspondingR
The voltage U corresponding with coulometervccIt is unequal, UvccVoltage is more than UR, so the premise of coulometer electricity correction to be carried out
It is that the electricity to equilibrium branch resistance loss carries out geometric ratio relation conversion, i.e.Q′r′It it is equilibrium branch resistance loss
Electricity QrCorresponding to the charge value of coulometer after conversion；Then the electricity of N-1 bar equilibrium branch resistance loss is corresponding to coulometer
Charge value beAssume that the electricity that coulometer calculates is Q, then the first of coulometer
Secondary electricity correction is Q=Q-Q 'R′；
Three, in charging process, all of equilibrium branch road is switched on, but does not reaches charging at the voltage of set of cells and stop threshold values
Time, charger continues to charge the battery；Now multichannel comparator circuit can produce a high level by AND circuit,
In addition to informing the kwh loss that MCU stops calculating equilibrium branch road, also open an other charging diverter branch so that all streams
Cross the electric current of equilibrium branch resistance all without flow through the sampling resistor of coulometer, thus improve the computational accuracy of coulometer and alleviate
The workload of MCU；Then the second time electricity correction of coulometer is to be completed by circuit；
Four, before set of cells is at full charge, if the cell voltage of equilibrium branch road releases voltage more than overcharge, protection board
Equilibrium branch road still can turn on, and battery is discharged by this branch road, during until cell voltage releases voltage less than overcharge, and equilibrium
Lu Caihui closes；When there being a branch road to quit work in all equilibrium branch roads, multichannel comparator circuit can pass through AND circuit
Produce a low level, inform that MCU starts to calculate the kwh loss of the equilibrium branch resistance after electric discharge terminates；According to above-mentioned,
The kwh loss of single equilibrium branch road is converted to corresponding to the geometric ratio of coulometerN-1 bar branch road
Kwh loss isWherein Δ t be set of cells before completing charging and terminating, all equilibrium branch roads have one
The calculating time that this branch road is closed closed by bar branch road；Assume that the electricity that coulometer calculates is Q, then coulometer third time electricity is repaiied
Q=Q-Q just "R″；
The formula that then coulometer revises electricity three times is: Q=Q-(Q 'R′+Q″R″)；Due to Q 'R′With Q "r″Computing formula the same,
So set of cells complete charging excessively in, can directly use formulaThe computing formula completed
Equally, the electricity correction of coulometer, Δ t now changes into equalizing the time that branch road is always on, deducts all equilibrium branch roads same
Time open-interval difference；
Five, set of cells is during actually accomplishing charging, can be due to the impact of the internal resistance of cell, and the IC of protection board is in charging current
In the case of equilibrium branch road shunting, can detect that equilibrium branch road two ends cell voltage is different, thereby result in the equal of IC output
Weighing apparatus control signal produces vibration；This oscillator signal can last till that equalizing circuit is opened, and battery both end voltage disappears when falling after rise little
Going, now battery is the most at full charge；The vibration of balanced control signal, can cause all equilibrium branch roads to be in and constantly beat simultaneously
Open, the situation of closedown；The turgor difference charge along with battery due to the cycle of equilibrium oscillator signal and different, it is always
Change, so cause all equilibrium branch roads in the case of opening, closing the most simultaneously, the last item equilibrium branch road is opened
Order is uncertain, random；In order to eliminate by the impact of protection board IC output Balance route oscillator signal, MCU is needed to remember
Recording the time that all equilibrium branch roads are opened respectively, the overlapping cross events opened together with all equilibrium branch roads, recorded is equal
The time that weighing apparatus branch road is opened deducts the overlapping cross events that all equilibrium branch roads are all opened, and is coulometer this equilibrium of many calculating and props up
The time of the electricity of road resistance consumption；So under the influence of equilibrium oscillator signal, equilibrium branch road consumes corresponding to coulometer
Electricity can use formulaRepresent, then N bar equilibrium branch road isWherein Δ t is this equilibrium
The time t that branch road is opened1, the time t that deducts2Difference；Then MCU module is in the case of equilibrium oscillator signal impact, revises storehouse
The formula of logical sequence quantity calculation is
Six, assume that the time having an equilibrium branch road vibration is 0 in N bar vibration branch road, then have the N bar equilibrium of vibration impact
Branch road calculates the correction formula of electricity to coulometerThe N-1 that can be changed into impact of not vibrating is equal
Weighing apparatus branch road calculates the correction formula of electricity to coulometerSet of cells completes the process of charging
In, MCU can be directly with the formula having vibration impactComplete the corrected Calculation of coulometer electricity.
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| CN109254201B (en) * | 2018-09-18 | 2021-04-09 | 易维德科（北京）电子科技有限公司 | Electrical parameter metering method and device, charging equipment and storage medium |
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