CN104377778B - Adjacent-Cell-to-Cell equalizing circuit based on LCL resonant transformation and implementation method - Google Patents
Adjacent-Cell-to-Cell equalizing circuit based on LCL resonant transformation and implementation method Download PDFInfo
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- CN104377778B CN104377778B CN201410698450.2A CN201410698450A CN104377778B CN 104377778 B CN104377778 B CN 104377778B CN 201410698450 A CN201410698450 A CN 201410698450A CN 104377778 B CN104377778 B CN 104377778B
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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
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
Abstract
The invention discloses a kind of Adjacent Cell to Cell equalizing circuit based on LCL resonant transformation and implementation method, equalizing circuit includes microcontroller, several LCL resonant transformation module and battery cells, wherein, the battery cell that each two is adjacent shares a LCL resonant transformation module, and each LCL resonant transformation module is connected microcontroller with battery cell；Microcontroller is according to the high voltage person of two adjacent battery cells and low-voltage person, the pwm signal of a pair state complementation is sent to the corresponding metal-oxide-semiconductor of LCL resonant transformation, make its alternation in charging and discharging state, thus realize energy and pass to, from the battery cell that voltage is high, the battery cell that voltage is low, when the frequency of PWM is equal to the natural resonance frequency of LCL, it is achieved Zero Current Switch equalizes.The equalizing circuit efficiency of the present invention is high, euqalizing current is big and controls simple, and it is big and can not realize the difficult problem of zero-voltage difference equilibrium to overcome tradition Cell to Cell equalizing circuit switching loss.
Description
Technical field
The present invention relates to a kind of Adjacent-Cell-to-Cell equalizing circuit based on LCL resonant transformation and implementation method.
Background technology
The whole world is faced with the unprecedented energy and environmental crisis, enjoys World Focusing.But, opportunities and challenges often and are deposited.
The energy internet being combined into feature with regenerative resource and internet will expedite the emergence of the third time industrial revolution.As third time industry leather
One of five big pillars of life, electric automobile is the most welcomed by the people with energy-saving and environmental protection, it has also become the certainty of future automobile development
Trend.Lithium ion battery is because its energy density is high, self-discharge rate is low and does not has memory effect, is widely used in electricity as power source
In electrical automobile and hybrid-electric car.In actual applications, in order to obtain higher electric pressure, battery pack is many with cascade
Use.But, serial lithium battery group brings a Tough questions: due to the restriction of manufacture craft, battery in battery pack monomer
Capacity and internal resistance there is fine difference, after battery pack uses a period of time, this fine difference can cause battery cell voltage
With the imbalance of SOC, greatly reduce active volume and the cycle life of battery pack.Therefore, battery balanced just seem very
Necessary.It is clear that as one of the key technology of battery management system, the efficient balance of series battery has become as one
Study hotspot.At present, equilibrium is broadly divided into dissipation equilibrium, non-dissipation equilibrium and battery and selects three major types.
Dissipation equilibrium is by carrying out electric discharge shunting to the resistance in parallel of each cell in battery pack, thus realizes equilibrium.
This circuit structure is simple, only by the energy ezpenditure of cell high for voltage, the problem that there is energy dissipation and heat management.
The energy consuming ratio dissipation equilibrium of non-dissipation equalizing circuit is little, but circuit structure is relative complex, and energy conversion type can be divided into equalize
Two kinds are equalized with energy transfer type.Energy conversion type equilibrium is by switching signal, overall to cell by Li-ion batteries piles
Supplement, or carried out energy conversion to battery pack by coaxial coil by cell.Consider from cost and equalization efficiency,
Energy conversion type can be applicable to middle low power occasion, but is not suitable for big battery pack.The equilibrium of energy transfer type is to utilize inductance or electric capacity
Deng energy-storage travelling wave tube, the energy in cell high for capacity in Li-ion batteries piles is transferred on the battery cell that Capacity Ratio is relatively low.
This circuit is switched by switch-capacitor, by the energy of electric capacity transmission adjacent cell, is sent to from the battery cell that voltage is high by electric charge
On the battery cell that voltage is low, thus reach the purpose of equilibrium.The energy loss of this circuit is the least, but reaches to equalize necessary
It is transmitted several times, so speed is relatively slow, is unsuitable for more battery pack of connecting.
Battery selects equilibrium to refer to the battery cell structure battery pack consistent by experimental selection performance, typically has two step screening processes.
The first step, under different discharge currents, selects the battery cell that battery average size is close；Second step, screens in the first step
Battery cell in, under different SOC, selected the battery list with close cell voltage variable quantity by pulse charge and discharge experiment
Body.Owing to the self-discharge rate of battery cell is not quite similar, battery selects equilibrium to be not enough to keep electricity in the whole life cycle of battery
Pond group equalizes always.It supplements equalization methods only as the one of other equalization methods.
The main cause that tradition equalization methods is not suitable for lithium ion battery is as follows:
(1) open-circuit voltage of lithium ion battery is relatively flat when SOC is between 20%-80%, even if SOC differs greatly, its
Corresponding voltage difference is the least, and therefore the euqalizing current of tradition equalizing circuit is the least.
(2) there is conduction voltage drop due to power electronic devices, between battery cell, be difficulty with zero-voltage difference equilibrium.
Chinese invention patent application (application number 201210595724.6) proposes a kind of capacitive battery equalization circuit, this circuit
Two the most adjacent batteries share an electric capacity, and when the battery cell that electric capacity and voltage are higher is in parallel, battery cell fills to electric capacity
Electricity；When the battery cell that electric capacity and voltage are relatively low is in parallel, electric capacity charges to battery cell.Through the charge and discharge of electric capacity, energy
Measure and transfer to, from the battery cell that voltage is higher, the battery cell that voltage is relatively low, thus realize battery voltage equilibrium.But the party
Method switching loss is big, efficiency is low, euqalizing current is little, and can not realize zero-voltage difference equilibrium.
Summary of the invention
The present invention is to solve the problems referred to above, disclose a kind of Adjacent-Cell-to-Cell based on LCL resonant transformation equilibrium electricity
Road and implementation method, equalizing circuit includes microcontroller, several LCL resonant transformation module and battery cells, wherein, every two
Individual adjacent battery cell shares a LCL resonant transformation module, and each LCL resonant transformation module is connected micro-control with battery cell
Device processed；Microcontroller is according to the high voltage person of two adjacent battery cells and low-voltage person, by PWM complementary for a pair state
Signal is sent to the corresponding metal-oxide-semiconductor of LCL resonant transformation so that it is alternation in charging and discharging state, thus realize energy from
The battery cell that voltage is high passes to the battery cell that voltage is low, when the frequency of PWM is equal to the natural resonance frequency of LCL,
Realize Zero Current Switch equilibrium.The equalizing circuit efficiency of the present invention is high, euqalizing current is big and controls simple, and overcomes tradition
Cell-to-Cell equalizing circuit switching loss is big and can not realize the difficult problem that zero-voltage difference equalizes.
To achieve these goals, the present invention adopts the following technical scheme that
A kind of Adjacent-Cell-to-Cell equalizing circuit based on LCL resonant transformation, including microcontroller, several LCL resonance
Conversion module and battery cell, wherein, the battery cell that each two is adjacent shares a LCL resonant transformation module, and each LCL is humorous
The conversion module that shakes is connected microcontroller with battery cell；
Described microcontroller includes analog-to-digital conversion module and pulse width modulation (PWM) signal output part, and wherein, described modulus turns
Die change block, is connected with battery cell by voltage detecting circuit, and the voltage signal of battery cell is converted into data signal, thus
Obtain the voltage of battery in battery pack monomer；
Described pulse width modulation (PWM) signal output part connects LCL resonant transformation module by drive circuit, is used for producing LCL
In resonant transformation module, the control of metal-oxide-semiconductor switch drives signal.
Described LCL resonant transformation module, including a LCL circuit and two metal-oxide-semiconductor branch roads, each metal-oxide-semiconductor branch road includes two
The metal-oxide-semiconductor of differential concatenation, one end of two branch roads is connected to positive pole and the negative pole of LCL circuit capacitance C, and the other end connects simultaneously
It is connected to the common port of adjacent two battery cells；One end of series LC L circuit is connected to the positive pole of adjacent two battery cells, another
End is connected to the negative pole of adjacent two battery cells.
Described LCL resonant transformation module is under the pwm signal that one group of state is complementary drives, and alternation is in charged state and puts
Electricity condition, when the frequency of pwm signal is equal to the natural resonance frequency of LCL resonant transformation, it is achieved Zero Current Switch equalizes.
Described LCL resonant transformation module is reversible transducer, by controlling the opening and closing of the metal-oxide-semiconductor of LCL resonant transformation module,
Enable that and flow to, from the battery cell that voltage is high, the battery cell that voltage is low.
Said two metal-oxide-semiconductor branch road, the pwm signal complementary when state is sent to the MOS of upper end in two metal-oxide-semiconductor branch roads
Guan Shi, energy passes to, from the battery cell that electromotive force is low, the battery cell that electromotive force is high；The pwm signal complementary when state is sent to
In two metal-oxide-semiconductor branch roads during the metal-oxide-semiconductor of lower end, energy passes to, from the battery cell that electromotive force is high, the battery cell that electromotive force is low.
A kind of implementation method applying above-mentioned equalizing circuit, comprises the following steps:
(1) monomer voltage is obtained: microcontroller obtains each monomer voltage of electrokinetic cell by analog-to-digital conversion module；
(2) equilibrium is started: microcontroller, according to the battery cell voltage obtained, calculates the voltage difference of adjacent two battery cell,
If its difference is more than battery balanced threshold value, then start the equalizing circuit that this group is corresponding；
(3) equilibrium direction is judged: microcontroller is according to the battery cell voltage obtained, it is judged that two adjacent battery cells
High voltage person and low-voltage person, and send the corresponding metal-oxide-semiconductor of a pair complementary pwm signal control LCL resonant transformation module of state；
(4) energy transmission: microprocessor control LCL resonant transformation module so that it is alternation in two states of charging and discharging,
The Zero Current Switch transmission of energy is realized when the pwm signal frequency sent is equal to the intrinsic frequency of LCL resonant transformation.
In described step (3), if the battery cell voltage that the high battery cell voltage of electromotive force is low higher than battery, then by complementary PWM
Signal is sent to the metal-oxide-semiconductor of lower end in two metal-oxide-semiconductor branch roads, if the battery list that the low battery cell voltage of electromotive force is high higher than electromotive force
Bulk voltage, then be sent to the metal-oxide-semiconductor of upper end in two metal-oxide-semiconductor branch roads by complementary pwm signal.
The operation principle of the present invention is: microcontroller obtains each monomer voltage of battery pack by D/A converter module, and then to adjacent
Two batteries monomer voltages compare, determine the adjacent cell monomer needing equilibrium, and judge high voltage person and low-voltage
Person；Then, microcontroller sends a pair complementary pwm signal control LCL resonant transformation module of state so that it is alternation exists
Two states of charging and discharging, thus energy high voltage person from adjacent cell monomer is transferred to low-voltage person.Especially,
When the PWM frequency that microcontroller sends is equal to the natural resonance frequency of LCL resonant transformation module, it is possible to achieve Zero Current Switch
Equilibrium.
The invention have the benefit that
(1) realize the Zero Current Switch equilibrium between battery cell adjacent in battery pack, there is higher equalization efficiency；
(2) tradition Cell-to-Cell type equalizing circuit euqalizing current problem little, inefficient is overcome, it is adaptable to high-capacity dynamical
The equilibrium of battery pack；
(3) charging and discharging deposit the difficult problem causing equalization efficiency low when overcoming tradition Pack-to-Cell type equalizing circuit equilibrium；
(4) effectively overcome owing to power electronic devices exists the difficulty being difficult to battery cell zero-voltage difference that conduction voltage drop causes
Topic.
Accompanying drawing explanation
Fig. 1 (a) is the equalizing circuit schematic diagram that the present invention includes n batteries monomer；
Fig. 1 (b) is the equalizing circuit schematic diagram that the present invention includes 2 batteries monomers；
Fig. 2 (a) is that the LCL resonant transformation of the present invention is at V0>V1Time charged state fundamental diagram；
Fig. 2 (b) is that the LCL resonant transformation of the present invention is at V0>V1Time discharge condition fundamental diagram；
Fig. 3 (a) is that the LCL resonant transformation of the present invention is at V1>V0Time charged state fundamental diagram；
Fig. 3 (b) is that the LCL resonant transformation of the present invention is at V1>V0Time and the fundamental diagram of discharge condition；
Fig. 4 is the charging and discharging currents i that is under resonant condition of the LCL resonant transformation of the present invention and capacitance voltage VCOscillogram；
Fig. 5 is the voltage design sketch that adjacent cell monomer is equalized by the LCL resonant transformation of the present invention.
Detailed description of the invention:
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
As Figure 1-5, a kind of Adjacent-Cell-to-Cell equalizing circuit based on LCL resonant transformation, including microcontroller and
LCL resonant transformation module, two the most adjacent batteries monomers share a LCL resonant transformation, and microcontroller connects LCL resonance and becomes
Change and battery cell.
Described microcontroller includes analog-to-digital conversion module and pulse width modulation (PWM) signal output part, wherein, described analog-to-digital conversion
Module, is connected with battery cell by voltage detecting circuit, for the voltage signal of battery cell is converted into data signal, from
And obtain the voltage of battery in battery pack monomer；
Described pulse width modulation (PWM) signal output part connects LCL resonant transformation module by drive circuit, is used for producing LCL
In resonant transformation module, the control of metal-oxide-semiconductor switch drives signal；
Described LCL resonant transformation module includes a series LC L circuit and two metal-oxide-semiconductor branch roads.Two reverse strings of each route
The metal-oxide-semiconductor composition of connection, one end of two branch roads is connected to positive pole and the negative pole of electric capacity C, and the other end is simultaneously coupled to adjacent two
The common port of individual battery cell；One end of series LC L circuit is connected to the positive pole of adjacent two battery cells, and the other end is connected to phase
The negative pole of adjacent two battery cells.
Described LCL resonant transformation module is under the pwm signal that one group of state is complementary drives, and alternation is in charged state and electric discharge
State, especially, when the frequency of pwm signal is equal to the natural resonance frequency of LCL resonant transformation, it is achieved Zero Current Switch is equal
Weighing apparatus.
Described LCL resonant transformation module is reversible transducer, can realize energy from voltage by controlling the metal-oxide-semiconductor of said two branch road
High battery cell flows to the battery cell that voltage is low.
When the pwm signal that state is complementary is sent to the metal-oxide-semiconductor of upper end in two metal-oxide-semiconductor branch roads, energy is from the low battery of electromotive force
Monomer passes to the battery cell that electromotive force is high；The pwm signal complementary when state is sent to the MOS of lower end in two metal-oxide-semiconductor branch roads
Guan Shi, energy passes to, from the battery cell that electromotive force is high, the battery cell that electromotive force is low.
A kind of implementation method applying above-mentioned Adjacent-Cell-to-Cell equalizing circuit based on LCL resonant transformation, including following step
Rapid:
(1) monomer voltage is obtained: microcontroller, by analog-to-digital conversion module, obtains each monomer voltage of electrokinetic cell；
(2) equilibrium is started: microcontroller, according to the battery cell voltage obtained, calculates the voltage difference of adjacent two battery cell,
If its difference is more than battery balanced threshold value, then start the equalizing circuit that this adjacent cell monomer is corresponding；
(3) equilibrium direction is judged: if being in the battery cell voltage of upper end (electromotive force is high) higher than being in lower end (electromotive force is low)
Battery cell voltage, then be sent to two metal-oxide-semiconductors of lower end in metal-oxide-semiconductor branch road by complementary pwm signal；If being in lower end (electricity
Gesture is low) battery cell voltage higher than being in the battery cell voltage of upper end (electromotive force high), then complementary pwm signal is sent
To two metal-oxide-semiconductors of upper end in metal-oxide-semiconductor branch road；
(4) energy transmission: microprocessor control LCL resonant transformation module so that it is alternation in two states of charging and discharging,
The Zero Current Switch transmission of energy is realized when the pwm signal frequency sent is equal to the intrinsic frequency of LCL resonant transformation.
Embodiment:
As it is shown in figure 1, digital signal processing chip DSP (TMS320F28335) selected by the microcontroller of equalizing circuit, there is height
Precision A/D sampling and PWM export；Voltage detecting circuit uses the LTC6802 specialized voltages of Linear Tech to measure chip and measures in real time
The voltage of every batteries in battery pack.As shown in Fig. 1 (a), it is applied to the block mold figure of battery pack for LCL resonance modules,
Every two adjacent sections battery cell shares a LCL resonance modules, and the series winding battery pack constituted for a n batteries monomer shares
To n-1 LCL resonance modules.
As shown in Fig. 1 (b), it is applied to adjacent two battery cell B for LCL resonance modules0And B1.LCL resonance circuit is by four
Individual metal-oxide-semiconductor M1-M4, four diode D1-D4, two inductance L1、L2With an electric capacity C composition.Wherein, M2、M4Source
Pole, D2、D4Positive pole respectively with B0Negative pole (B1Positive pole) be connected；Inductance L1With B0Positive pole be connected, L2With B1Negative
The most connected.Metal-oxide-semiconductor M1、M3The pwm signal complementary by a pair state from microcontroller DSP drives, M2、M4By separately
The pwm signal of a pair state complementation drives.During the charge or discharge of each LCL resonance circuit, control one of them MOS
Pipe turns on, and remaining metal-oxide-semiconductor is held off.
After circuit runs, microcontroller by analog-to-digital conversion module, obtains each monomer voltage of electrokinetic cell, so that it is determined that need into
Adjacent two battery cells of row equilibrium, and judge that voltage difference, whether more than battery balanced threshold value 0.01V, if being more than, starts correspondence
Equalizing circuit.Under equilibrium state, microprocessor control LCL resonance circuit make its alternation in two states of charging and discharging,
Thus realize the continuous transmission of energy.
As in figure 2 it is shown, be at V0>V1Time equalizing circuit fundamental diagram.Complementary pwm signal is sent to down by microcontroller
End metal-oxide-semiconductor M4And M2.As shown in Fig. 2 (a), work as M4During conducting, M1、M2And M3Turn off, B0, inductance L1With electric capacity C
Form resonant tank, now a B0Charging electric capacity C, resonance current i is just, the voltage V at electric capacity C two endscBegin to ramp up；As
Shown in Fig. 2 (b), work as M2During conducting, M1、M3And M4Turn off, B1, inductance L2A resonant tank is become with electric capacity C-shaped, this
Time electric capacity C to B1Electric discharge, resonance current i becomes negative value, the voltage V at electric capacity C two endscBegin to decline.Through LCL resonance circuit
One charge and discharge process, by B0Energetic portions transfer to B1, it is achieved thereby that B0And B1The equilibrium of voltage.
As it is shown on figure 3, be at V0<V1Time equalizing circuit fundamental diagram.Complementary pwm signal is sent to by microcontroller
End metal-oxide-semiconductor M1And M3.As shown in Fig. 3 (a), work as M1During conducting, M2、M3And M4Turn off, B1, inductance L2With electric capacity C
Form resonant tank, now a B1Charging electric capacity C, resonance current i is just, the voltage V at electric capacity C two endscBegin to ramp up；As
Shown in Fig. 3 (b), work as M3During conducting, M1、M2And M4Turn off, B0, inductance L1A resonant tank is become with electric capacity C-shaped, this
Time electric capacity C to B0Electric discharge, resonance current i becomes negative value, the voltage V at electric capacity C two endscBegin to decline.Through LCL resonance circuit
One charge and discharge process, B1Energetic portions transfer to B0, it is achieved thereby that B0And B1The equilibrium of voltage.
As shown in Figure 4, the charging and discharging currents i being under resonant condition for LCL resonant transformation and capacitance voltage VCOscillogram, by scheming
It can be seen that in the balancing procedure of one group of adjacent monomer, one group of complementary pwm signal (PWM+, PWM-) controls MOS
The alternate conduction of pipe, capacitance voltage VC, euqalizing current i cyclically-varying, capacitance voltage VCLagging current i 90o, leading of metal-oxide-semiconductor
Logical and shutoff occurs exactly at electric current i zero crossing, it is achieved that Zero Current Switch, drastically increases equalization efficiency.
It is illustrated in figure 5 the voltage design sketch that adjacent cell monomer is under static state equalized by LCL resonant transformation, works as battery
Monomer initial voltage is respectively VB0=3.001V, VB1During=3.209V, it is only necessary to the time of about 12.5s, equalizing circuit allows for
The voltage difference of adjacent cell monomer is close to 0, it is achieved that the zero-voltage difference equilibrium between battery cell.
Although the detailed description of the invention of the present invention is described by the above-mentioned accompanying drawing that combines, but not limit to scope
System, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art need not pay
Go out various amendments or deformation that creative work can make still within protection scope of the present invention.
Claims (5)
1. an Adjacent-Cell-to-Cell equalizing circuit based on LCL resonant transformation, is characterized in that: include microcontroller,
Several LCL resonant transformation module and battery cells, wherein, the battery cell that each two is adjacent shares a LCL resonant transformation mould
Block, each LCL resonant transformation module is connected microcontroller with battery cell；
Described microcontroller includes analog-to-digital conversion module and pulse width modulation (PWM) signal output part, and wherein, described modulus turns
Die change block, is connected with battery cell by voltage detecting circuit, and the voltage signal of battery cell is converted into data signal, thus
Obtain the voltage of battery in battery pack monomer；
Described pulse width modulation (PWM) signal output part connects LCL resonant transformation module by drive circuit, is used for producing LCL
In resonant transformation module, the control of metal-oxide-semiconductor switch drives signal；
Described LCL resonant transformation module, including a LCL circuit and two metal-oxide-semiconductor branch roads, each metal-oxide-semiconductor branch road includes two
The metal-oxide-semiconductor of differential concatenation, one end of two branch roads is connected to positive pole and the negative pole of the electric capacity C of LCL circuit, and the other end is simultaneously
It is connected to the common port of adjacent two battery cells；One end of series LC L circuit is connected to the positive pole of adjacent two battery cells, separately
One end is connected to the negative pole of adjacent two battery cells；Described LCL resonant transformation module is driven at the pwm signal that one group of state is complementary
Under Dong, alternation is in charged state and discharge condition, when the frequency of pwm signal is equal to the natural resonance frequency of LCL resonant transformation
During rate, it is achieved Zero Current Switch equalizes.
A kind of Adjacent-Cell-to-Cell equalizing circuit based on LCL resonant transformation, it is special
Levy and be: described LCL resonant transformation module is reversible transducer, by controlling the opening and closing of the metal-oxide-semiconductor of LCL resonant transformation module,
Enable that and flow to, from the battery cell that voltage is high, the battery cell that voltage is low.
A kind of Adjacent-Cell-to-Cell equalizing circuit based on LCL resonant transformation, it is special
Levying and be: said two metal-oxide-semiconductor branch road, the pwm signal complementary when state is sent to the MOS of upper end in two metal-oxide-semiconductor branch roads
Guan Shi, energy passes to, from the battery cell that electromotive force is low, the battery cell that electromotive force is high；The pwm signal complementary when state is sent to
In two metal-oxide-semiconductor branch roads during the metal-oxide-semiconductor of lower end, energy passes to, from the battery cell that electromotive force is high, the battery cell that electromotive force is low.
4. the implementation method of the equalizing circuit as according to any one of claim 1-3, is characterized in that: comprise the following steps:
(1) monomer voltage is obtained: microcontroller obtains each monomer voltage of electrokinetic cell by analog-to-digital conversion module；
(2) equilibrium is started: microcontroller, according to the battery cell voltage obtained, calculates the voltage difference of adjacent two battery cell,
If its difference is more than battery balanced threshold value, then start the equalizing circuit that this adjacent cell monomer is corresponding；
(3) equilibrium direction is judged: microcontroller is according to the battery cell voltage obtained, it is judged that two adjacent battery cells
High voltage person and low-voltage person, and send the relevant metal-oxide-semiconductor of a pair complementary pwm signal control LCL resonant transformation module of state；
(4) energy transmission: microprocessor control LCL resonant transformation module so that it is alternation in two states of charging and discharging,
The Zero Current Switch transmission of energy is realized when the pwm signal frequency sent is equal to the intrinsic frequency of LCL resonant transformation.
5. implementation method as claimed in claim 4, is characterized in that: in described step (3), if the battery cell that electromotive force is high
The battery cell voltage that voltage is low higher than electromotive force, then be sent to the MOS of lower end in two metal-oxide-semiconductor branch roads by complementary pwm signal
Pipe, if the battery cell voltage that the low battery cell voltage of electromotive force is high higher than electromotive force, is then sent to two by complementary pwm signal
The metal-oxide-semiconductor of upper end in metal-oxide-semiconductor branch road.
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| CN104659885B (en) * | 2015-03-23 | 2017-01-04 | 阳光电源股份有限公司 | A kind of balanced system for storage battery pack and balance control method |
| CN106505663B (en) * | 2016-11-04 | 2019-01-25 | 重庆雅讯电源技术有限公司 | Series-connected cell group equilibrium system and method |
| CN106712211B (en) * | 2017-02-21 | 2023-08-08 | 山东大学 | Double-layer active equalization circuit based on multi-input transformation and implementation method |
| CN106787021B (en) * | 2017-03-16 | 2023-11-17 | 山东大学 | Battery pack equalizer modularization system and method based on multi-winding transformer |
| CN107187334A (en) * | 2017-07-27 | 2017-09-22 | 重庆日拓能源科技有限公司 | Series battery voltage balanced management system, series battery and its control method |
| CN112606781B (en) * | 2020-12-28 | 2023-03-31 | 卢浩义 | Electronic control type starting battery and control and application method thereof |
| CN113098115B (en) * | 2021-06-10 | 2021-08-17 | 西南交通大学 | Resonant series battery voltage-sharing circuit based on multi-port transformer and implementation method |
| CN114189022A (en) * | 2021-12-15 | 2022-03-15 | 傲普(上海)新能源有限公司 | Battery monomer capacitance balance control circuit of parallel battery module |
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