CN103532197A - Power battery pack equalization circuit based on boost conversion and soft switching, and realization method - Google Patents
Power battery pack equalization circuit based on boost conversion and soft switching, and realization method Download PDFInfo
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Abstract
The invention discloses a power battery pack equalization circuit based on boost conversion and soft switching, and a realization method of the equalization circuit. The equalization circuit mainly comprises a microcontroller, a switching module, a BOOST conversion module and an LC (inductance-capacitance) resonance circuit, wherein the microcontroller gates battery monomers with maximum voltage and minimum voltage in any position of a battery pack on an equalization bus according to battery monomer numbers corresponding to maximum monomer voltage and minimum monomer voltage; and the microcontroller sends a pair of state-complementary PWM (pulse-width modulation) signals to control the LC resonance circuit, so that the LC resonance circuit alternately operates in charging and discharging states. The equalization circuit and the realization method effectively solve the problem that zero voltage difference of the battery monomers cannot be realized easily due to conduction voltage drop of electric and electronic devices; equalization current is increased; the equalization time is shortened; zero current switching equalization is realized; energy waste is reduced; the inconsistency among the battery monomers is improved effectively; and the equalization efficiency is improved.
Description
Technical field
The present invention relates to a kind of new-energy automobile power control technology, relate in particular to a kind of power battery equalization circuit and implementation method based on boosting inverter and soft switch.
Background technology
At present, lithium ion battery, due to its higher energy density and low self-discharge rate, is widely used in pure electric automobile, mixed power electric car, battery-operated motor cycle and UPS uninterrupted power supply.Because lithium-ion battery monomer voltage only has 2.5-3.6V, for meeting electric automobile power drive demand, generally battery cell series connection need to be used to improve electric pressure.Yet battery cell is in manufacturing process, due to reasons such as techniques, the capacity of same batch battery, internal resistance etc. there are differences; In use, the difference of self-discharge of battery rate, environment for use, as the difference of temperature, circuit board, also can cause the imbalance of battery capacity.Therefore electrokinetic cell is in charge and discharge process, and some monomer voltages can be higher, and some monomer voltages can be on the low side.If electrokinetic cell, for a long time in this inconsistent state, except meeting affects the useful life of battery, also easily causes that battery damages, and even blasts.In order to eliminate the inhomogeneities of battery cell, need to carry out equilibrium to battery.At present, equilibrium mainly contains energy dissipation type and the large class of energy non-dissipative type two.
Energy dissipation type is by the shunting of discharging to the resistance in parallel of each cell in battery pack, thereby realization is balanced.Energy non-dissipative type circuit adopts electric capacity, inductance as energy-storage travelling wave tube, utilizes common power converting circuit as topology basis, takes to disperse or concentrated structure, realizes unidirectional or two-way charging scheme.
Energy dissipation type circuit structure is simple, by the shunting of discharging to the resistance in parallel of each cell in battery pack, thereby realizes equilibrium, has the problem of energy dissipation and heat management.Energy non-dissipative type circuit adopts electric capacity, inductance as energy-storage travelling wave tube, utilize common power converting circuit as topology basis, take to disperse or concentrated structure, realize unidirectional or two-way charging scheme, have the shortcomings such as circuit structure is complicated, volume is large, cost is high, time for balance is long, high switching loss.
Chinese invention patent application (application number 201010572115.X) discloses a kind of equalizing resistance that utilizes battery in battery pack monomer has been carried out to balanced circuit, mainly comprises controller, resistance commutation circuit and equalizing resistance.First this invention determines the dump energy of each battery cell according to the magnitude of voltage gathering, then controlling resistance commutation circuit is in parallel by the equalizing resistance battery cell higher with electric weight, discharges, thereby realize battery cell electric quantity balancing to this battery cell.This circuit is that the mode consuming by energy limits battery cell overtension in fact, is only suitable in static equilibrium, has the problem of energy dissipation and heat management.
Chinese invention patent application (application number 201210595724.6) has proposed a kind of condenser type battery equalizing circuit, and the every two adjacent batteries of this circuit share an electric capacity, and when the electric capacity battery cell higher with voltage is in parallel, battery is to capacitor charging; When the electric capacity battery cell lower with voltage is in parallel, electric capacity charges the battery.Through the charge and discharge of electric capacity, energy transfers to from the higher battery cell of voltage the battery cell that voltage is lower, thereby its voltage is equated.But it is more to work as series-connected cell amount of monomer, needed balanced electric capacity and field effect transistor and drive circuit thereof are more, cause circuit bulky, and when the high and minimum adjacent a plurality of monomer of battery of voltage, the balanced way of this " passing the flower while the drum is beaten ", can reduce balanced efficiency greatly.
Chinese invention patent application (application number 201310278475.2) has proposed a kind of electrokinetic cell Zero Current Switch active equalization circuit and implementation method, its can real-time judge battery pack in the high and minimum battery cell of voltage, and it is carried out to Zero Current Switch equilibrium, and each equilibrium is all that two battery cells for voltage difference maximum in battery pack carry out peak load shifting, greatly improve balanced efficiency, effectively reduced the inconsistency between battery cell.But, because used power electronic device exists conduction voltage drop, make between battery cell, to be difficult to reach zero-voltage difference, and euqalizing current being very little, time for balance is longer.
The open circuit voltage of lithium ion battery is the comparatively smooth (state-of-charge that SOC is battery between 30%-70% time at SOC, during SOC=100%, expression battery is full power state), even if SOC differs greatly, its corresponding voltage difference is also very little, and therefore traditional equalization methods euqalizing current is less, and because power electronic device exists conduction voltage drop, make between battery cell, to be difficult to reach zero-voltage difference, and because power electronic device is operated in hard switching state, switching loss is higher.
Summary of the invention
Object of the present invention is exactly in order to address the above problem, a kind of power battery equalization circuit and implementation method based on boosting inverter and soft switch proposed, this equalizing circuit can be realized Zero Current Switch euqalizing current, overcome the problem that has voltage difference between battery cell, reduce energy dissipation, improve balanced efficiency.
To achieve these goals, the present invention adopts following technical scheme:
A kind of power battery equalization circuit based on boosting inverter and soft switch, comprise microcontroller, switch module, BOOST boosting inverter module and LC resonant circuit, microcontroller connecting valve module, LC resonant circuit and BOOST boosting inverter module, BOOST boosting inverter module connects LC resonant circuit, and LC resonant circuit is by balanced bus connecting valve module; Wherein,
Described microcontroller comprises analog-to-digital conversion module, drive circuit and universal I/O end;
Described analog-to-digital conversion module, is connected with BOOST boosting inverter module with battery cell, for converting the voltage signal of battery cell to digital signal, thereby determines the high and minimum battery cell of voltage;
The pulse width modulation (PWM) signal output part of described drive circuit connects BOOST boosting inverter module, for generation of controlling, drives signal;
Described universal I/O end is connected with switch module, high monomer voltage and battery numbering corresponding to minimum monomer voltage for decoding microcontroller, determined, control switch module is by the high and minimum battery cell gating of the voltage of optional position in battery pack extremely on balanced bus.
Described BOOST boosting inverter module comprises an inductance L
b, a metal-oxide-semiconductor M
b, a diode D
bwith a large capacitor C
b.
Described LC resonant circuit comprises four metal-oxide-semiconductors, four diodes and a lc circuit, wherein metal-oxide-semiconductor M
1and M
2you Yi road PWM+ signal driver, metal-oxide-semiconductor M
3and M
4by the reverse PWM-signal driver of another line state, diode D
1-D
4play reverse flow limiting.
Described balanced bus comprises balanced bus I and balanced bus II, and described switch module comprises switch module I and switch module II, and balanced bus I connects BOOST boosting inverter module and switch module I; Balanced bus II connecting valve module ii and LC resonant circuit.
Described LC resonant circuit, under the pwm signal of two state complementations drives, alternately changes between two states of charging and discharging.
Described charged state is that LC resonant circuit is in parallel with BOOST boosting inverter module.
Described discharge condition is that the battery cell that LC resonant circuit is minimum with voltage is in parallel.
When the frequency of described pwm signal equals the natural resonance frequency of LC resonant circuit, equalizing circuit carries out Zero Current Switch equilibrium to two battery cells of voltage difference maximum in battery pack.
An implementation method for the above-mentioned power battery equalization circuit based on boosting inverter and soft switch, comprises the following steps:
(1) obtain monomer voltage: microcontroller, by analog-to-digital conversion module, obtains each monomer voltage of electrokinetic cell, thereby determine high monomer voltage and minimum monomer voltage and corresponding battery cell numbering;
(2) judgement voltage: microcontroller, according to the highest and minimum battery cell voltage obtaining, calculates maximum monomer voltage poor, if difference is greater than battery balanced threshold value, starts equalizing circuit;
(3) gating battery: microcontroller by decoding circuit by high monomer voltage and battery cell numbering decoding corresponding to minimum monomer voltage, control switch module by high monomer voltage and battery cell gating corresponding to minimum monomer voltage to balanced bus;
(4) energy transmission: microprocessor controls BOOST boosting inverter module boosts to a higher voltage by the highest battery cell of voltage, control LC resonant circuit simultaneously and make its alternation at two states of charging and discharging, thereby realize the continuous transmission of energy.
In described step (4), when LC resonant circuit is in parallel with BOOST boosting inverter module, BOOST boosting inverter module is charged to LC resonant circuit, when the LC resonant circuit battery cell minimum with voltage is in parallel, LC resonant circuit charges to battery cell, along with the charge and discharge of LC resonant circuit, realized energy and transferred to from the higher battery cell of voltage the battery cell that voltage is lower.
Operation principle of the present invention is:
Microcontroller is according to high monomer voltage and battery cell numbering corresponding to minimum monomer voltage, through universal I/O end encoded control switch module, by the high and minimum battery cell gating of the voltage of optional position in battery pack extremely on balanced bus; Then, microprocessor controls BOOST boosting inverter module boosts to a higher voltage by the highest battery cell of voltage, has overcome the problem that is difficult to realize battery cell zero-voltage difference that exists conduction voltage drop to cause due to power electronic device; Microcontroller sends the pwm signal control LC resonant circuit of a pair of state complementation simultaneously, makes its alternation at two states of charging and discharging.Especially, when the PWM frequency of sending when microcontroller equals the natural resonance frequency of LC resonant circuit, can realize Zero Current Switch equilibrium, and each equilibrium is all that two battery cells for voltage difference maximum in battery pack carry out peak load shifting, greatly improved balanced efficiency.
Beneficial effect of the present invention is:
(1) effectively overcome the problem that is difficult to realize battery cell zero-voltage difference that exists conduction voltage drop to cause due to power electronic device;
(2) increase euqalizing current, reduced time for balance;
(3) realize Zero Current Switch equilibrium, reduce energy dissipation;
(4) effectively improve the inconsistency between battery cell, improved balanced efficiency.
Accompanying drawing explanation
Fig. 1 is composition schematic diagram of the present invention;
Fig. 2 is LC resonant circuit charging fundamental diagram of the present invention;
Fig. 3 is LC resonant circuit electric discharge fundamental diagram of the present invention;
Fig. 4 is charging and discharging currents oscillogram of the present invention;
Fig. 5 is the portfolio effect figure under electrokinetic cell inactive state of the present invention;
Fig. 6 is the balanced efficiency chart under electrokinetic cell inactive state of the present invention.
Wherein, 1, switch module I; 2, balanced bus II; 3, battery cell; 4, balanced bus I; 5, microcontroller; 6, BOOST boosting inverter module; 7, LC resonant circuit; 8, drive circuit; 9, multi-channel gating switch; 10, voltage detecting circuit; 11, switch module II.
Embodiment:
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As shown in Figure 1, a kind of power battery equalization circuit based on boosting inverter and soft switch, comprise microcontroller 5, switch module, BOOST boosting inverter module 6 and LC resonant circuit 7, microcontroller 5 connecting valve modules, LC resonant circuit 7 and BOOST boosting inverter module 6, BOOST boosting inverter module 6 connects LC resonant circuit 7, and LC resonant circuit 7 is by balanced bus connecting valve module ii 11; Wherein,
Analog-to-digital conversion module is for converting the voltage signal of battery cell 3 to digital signal, thus definite high and minimum battery cell 3 of voltage;
The pulse width modulation (PWM) signal output part of drive circuit 8 connects BOOST boosting inverter module 6, for generation of controlling, drives signal;
Universal I/O end is connected with switch module, high monomer voltage and battery cell 3 numberings corresponding to minimum monomer voltage for decoding microcontroller 5, determined, control switch module is by high and minimum battery cell 3 gatings of the voltage of optional position in battery pack extremely on balanced bus.
BOOST boosting inverter module 6 comprises an inductance L
b, a metal-oxide-semiconductor M
b, a diode D
bwith a large capacitor C
b.BOOST boosting inverter module 6 is for exporting a higher voltage to realize the zero-voltage difference of 3 of large current balance and battery cells, particularly, microcontroller 5 sends a road pwm signal and drives the metal-oxide-semiconductor in BOOST boosting inverter module 6, and the control mode that adopts closed loop PID regulates the duty ratio of described PWM, make stable and higher voltage of BOOST boosting inverter module 6 output.
Balanced bus comprises balanced bus I4 and balanced bus II2, and switch module comprises that the balanced bus I4 of switch module I1 and switch module II11 is connected BOOST boosting inverter module 6 and switch module I1; Balanced bus II2 connecting valve module ii 11 and LC resonant circuit 7.
An implementation method for the above-mentioned power battery equalization circuit based on boosting inverter and soft switch, comprises the following steps:
(1) obtain battery cell 3 voltages: microcontroller 5, by analog-to-digital conversion module, obtains each monomer voltage of electrokinetic cell, thereby determine high monomer voltage and minimum monomer voltage and corresponding battery cell 3 numberings;
(2) judgement voltage: microcontroller 5, according to the highest and minimum battery cell voltage obtaining, calculates maximum monomer voltage poor, if difference is greater than battery balanced threshold value, starts equalizing circuit;
(3) gating battery: battery cell 3 numberings that the high monomer voltage that microcontroller 5 is determined by decoding circuit and minimum monomer voltage are corresponding, control switch module by high monomer voltage and battery cell gating corresponding to minimum monomer voltage to balanced bus;
(4) energy transmission: microcontroller 5 is controlled BOOST boosting inverter module 6 the highest battery cell 3 of voltage is boosted to a higher voltage, control LC resonant circuit 7 simultaneously and make its alternation at two states of charging and discharging, thereby realize the continuous transmission of energy.
In step (4), when LC resonant circuit 7 is in parallel with BOOST boosting inverter module 6, BOOST boosting inverter module 6 is given LC resonant circuit charging 7, when LC resonant circuit 7 battery cell 3 minimum with voltage is in parallel, LC resonant circuit 7 gives battery cell 3 chargings, along with the charge and discharge of LC resonant circuit 7, realized energy and transferred to from the higher battery cell 3 of voltage the battery cell 3 that voltage is lower.
Embodiment mono-:
The 6 batteries monomers 3 of take are example, and suppose B
1for the highest battery cell 3 of voltage, B
4for the minimum battery cell 3 of voltage.
The microcontroller 5 of equalizing circuit is selected Digital Signal Processing DSP(TMS320F28335), there is high-precision A/D sampling and PWM output; Multi-channel gating switch 9 is selected CD4051, is single 8 passages numeral control simulation electronic switches, have tri-binary system control input ends of A, B and C and
totally 4 inputs, have low conduction impedance and very low cut-off leakage current; Voltage detecting circuit 10 adopts the LTC6802 specialized voltages of Linear Tech to measure the voltage that chip is measured every batteries in battery pack in real time.
Switch module I1, switch module II11 select the relay with a pair of normally opened contact, and its model is HJR1-2C L-05V, (S in Fig. 1
x, Q
x) or (S '
x, Q '
x) be a pair of normal open switch.Microcontroller 5 is controlled its conducting or closure by a multi-channel gating switch 9CD4051.
BOOST boosting inverter module 6 is by an inductance L
b, a metal-oxide-semiconductor M
b, a diode D
bwith a large capacitor C
bform.BOOST boosting inverter module 6 operates mainly in two states of charging and discharging: when metal-oxide-semiconductor conducting, battery cell 3 starts inductance L
bcharging, along with the increase of inductive current, the energy of storing in inductance increases; As metal-oxide-semiconductor M
bduring disconnection, battery and inductance L
bstart through diode D
bto capacitor discharge, electric capacity both end voltage raises, and now voltage is higher than input voltage.In a word, the process of boosting is exactly the energy transfer process of an inductance.During charging, inductance absorbs energy, and during electric discharge, inductance is emitted energy.If electric capacity is enough large, at output, just can in discharge process, keep a lasting electric current so.By controlling the duty ratio of metal-oxide-semiconductor conducting, can regulate the size of BOOST boosting inverter module 6 output voltages, the duty ratio that the present invention adopts closed loop PID control device to control metal-oxide-semiconductor conducting makes BOOST boosting inverter module 6 output voltages remain on 7.5V left and right.
LC resonant circuit 7 is by four metal-oxide-semiconductor M
1-M
4, four diode D
1-D
4with an inductance L, a capacitor C the electric circuit constitute.Wherein, M
1, M
2, D
1, D
2form charge circuit with L, C; M
3, M
4, D
3, D
4form discharge loop with L, C.M
1source electrode, D
2negative pole respectively with BOOST boosting inverter module 6 in capacitor C
bpositive and negative electrode be connected; D
3negative pole, M
4source electrode be connected with balanced bus II2 positive and negative electrode respectively.Diode D
1-D
4play isolation.Metal-oxide-semiconductor M
1-M
4pwm signal by a pair of state complementation from microcontroller 5DSP drives, wherein M
1and M
2you Yi road PWM+ signal driver, M
3and M
4pWM-signal driver by another line state complementation.Work as M
1and M
2conducting, M
3and M
4during shutoff, LC resonant circuit and 7 is operated in charged state; Work as M
3and M
4conducting, M
1and M
2during shutoff, LC resonant circuit 7 is operated in discharge condition.So, by the continuous charge and discharge of LC resonant circuit 7, can realize energy and be transferred to from the highest battery cell 3 of voltage the battery cell 3 that voltage is minimum, especially, when the PWM frequency of sending when microcontroller 5 equals the natural resonance frequency of LC quasi-resonance circuit 7, realize Zero Current Switch equilibrium.
First, microcontroller 5 is by analog-to-digital conversion module, obtain each monomer voltage of electrokinetic cell, thereby determine high monomer voltage and minimum monomer voltage and corresponding battery cell 3 numberings, and judge whether maximum voltage difference is greater than battery balanced threshold value, if be greater than, start equalizing circuit, and by coding chip CD4051 gating switch module I 1 (S '
2, Q '
2) and (S of switch module II11
5, Q
5) and keep its conducting state until this equilibrium finishes, respectively by the highest battery cell B of voltage
1with the minimum battery cell B of voltage
4gating is to balanced bus I4 and balanced bus II2.
Under equilibrium state, microcontroller 5 adopts PID controller to control, and BOOST boosting inverter module 6 is by the highest battery cell B of voltage
1boost to 7.5V left and right.
Meanwhile, control LC resonant circuit 7 and make its alternation at two states of charging and discharging, thereby realize the continuous transmission of energy.
As shown in Figure 2, work as M
1and M
2during conducting, M
3and M
4turn-off, LC resonant circuit 7 is in parallel with BOOST boosting inverter module 6.C
b, inductance L and capacitor C form a resonant tank, now charging, resonance current i is being for just, the voltage V at capacitor C two ends
cstart to rise until resonance current i becomes negative value, as seen from Figure 3, V
chysteresis resonance current i tetra-/one-period, and waveform is sine wave.This moment, due to M
3and M
4in off state, battery cell B
4open circuit, so flow into B
4current i
b4be zero; Because microcontroller 5 is controlled BOOST boosting inverter module 6 output voltage stabilizations in 7.5V left and right, so flow into the resonance current i of LC, be outflow battery cell B again
1electric current, and rated current while flowing out battery cell for just, so can obtain the B shown in state I as shown in Figure 4
1and B
4current waveform.
As shown in Figure 3, work as M
3and M
4during conducting, M
1and M
2turn-off, LC resonant circuit 7 is by switch module I1, switch module II11 and the minimum battery cell B of voltage
4in parallel.B
4, L and C form a resonant tank, now electric discharge, resonance current i is for negative, the voltage V at capacitor C two ends
cstart to decline until resonance current become on the occasion of.Because BOOST boosting inverter module 6, in open-circuit condition, therefore flows out battery cell B
1current i
b1be zero; Resonance current i is exactly B this moment simultaneously
4charging current, therefore can obtain the B as shown in Fig. 4 state II
1and B
4current waveform.
As shown in Figure 5, Figure 6, when battery cell initial voltage is respectively B
0=3.098V, B
1=3.112V, B
2=3.079V, B
3=2.975V, B
4=3.036V, B
5=3.083V, B
6=3.1V, B
7during=2.853V, only need the time of about 3000s, equalizing circuit just makes the maximum voltage difference of battery in battery pack monomer close to 0, and the balanced efficiency of measuring is up to 98.6%.
Although above-mentioned, by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (8)
1. the power battery equalization circuit based on boosting inverter and soft switch, it is characterized in that: comprise microcontroller, switch module, BOOST boosting inverter module and LC resonant circuit, microcontroller connecting valve module, LC resonant circuit and BOOST boosting inverter module, BOOST boosting inverter module connects LC resonant circuit, and LC resonant circuit is by balanced bus connecting valve module; Wherein,
Described microcontroller comprises analog-to-digital conversion module, drive circuit and universal I/O end;
Described analog-to-digital conversion module, is connected with BOOST boosting inverter module with battery cell, for converting the voltage signal of battery cell to digital signal, thereby determines the high and minimum battery cell of voltage;
The pulse width modulation (PWM) signal output part of described drive circuit connects BOOST boosting inverter module, for generation of controlling, drives signal;
Described universal I/O end is connected with switch module, high monomer voltage and battery numbering corresponding to minimum monomer voltage for decoding microcontroller, determined, control switch module is by the high and minimum battery cell gating of the voltage of optional position in battery pack extremely on balanced bus.
2. a kind of power battery equalization circuit based on boosting inverter and soft switch as claimed in claim 1, it is characterized in that: described balanced bus comprises balanced bus I and balanced bus II, switch module comprises switch module I and switch module II, and balanced bus I connects BOOST boosting inverter module and switch module I; Balanced bus II connecting valve module ii and LC resonant circuit.
3. a kind of power battery equalization circuit based on boosting inverter and soft switch as claimed in claim 1, is characterized in that: described LC resonant circuit, under the pwm signal of two state complementations drives, alternately changes between two states of charging and discharging.
4. a kind of power battery equalization circuit based on boosting inverter and soft switch as claimed in claim 1, is characterized in that: described charged state is that LC resonant circuit is in parallel with BOOST boosting inverter module.
5. a kind of power battery equalization circuit based on boosting inverter and soft switch as claimed in claim 1, is characterized in that: described discharge condition is that the battery cell that LC resonant circuit is minimum with voltage is in parallel.
6. a kind of power battery equalization circuit based on boosting inverter and soft switch as claimed in claim 1, it is characterized in that: when the frequency of described pwm signal equals the natural resonance frequency of LC resonant circuit, equalizing circuit carries out Zero Current Switch equilibrium to two battery cells of voltage difference maximum in battery pack.
7. apply an implementation method for the above-mentioned power battery equalization circuit based on boosting inverter and soft switch, it is characterized in that: comprise the following steps:
(1) obtain monomer voltage: microcontroller, by analog-to-digital conversion module, obtains each monomer voltage of electrokinetic cell, thereby determine high monomer voltage and minimum monomer voltage and corresponding battery cell numbering;
(2) judgement voltage: microcontroller, according to the highest and minimum battery cell voltage obtaining, calculates maximum monomer voltage poor, if difference is greater than battery balanced threshold value, starts equalizing circuit;
(3) gating battery: high monomer voltage and battery cell corresponding to minimum monomer voltage that microcontroller is determined by decoding circuit are numbered, control switch module by high monomer voltage and battery cell gating corresponding to minimum monomer voltage to balanced bus;
(4) energy transmission: microprocessor controls BOOST boosting inverter module boosts to a higher voltage by the highest battery cell of voltage, control LC resonant circuit simultaneously and make its alternation at two states of charging and discharging, thereby realize the continuous transmission of energy.
8. a kind of implementation method as claimed in claim 7, it is characterized in that: in described step (4), when LC resonant circuit is in parallel with BOOST boosting inverter module, the control mode of described BOOST boosting inverter is PID closed-loop control, BOOST boosting inverter module is charged to LC resonant circuit, when the LC resonant circuit battery cell minimum with voltage is in parallel, LC resonant circuit charges to battery cell, along with the charge and discharge of LC resonant circuit, realized energy and transferred to from the higher battery cell of voltage the battery cell that voltage is lower.
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