CN103532197B - Based on power battery equalization circuit and the implementation method of boosting inverter and Sofe Switch - Google Patents
Based on power battery equalization circuit and the implementation method of boosting inverter and Sofe Switch Download PDFInfo
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Abstract
The invention discloses a kind of power battery equalization circuit based on boosting inverter and Sofe Switch and its implementation, equalizing circuit mainly comprises microcontroller, switch module, BOOST boosting inverter module and LC resonant circuit, microcontroller according to most high monomer voltage and battery cell numbering corresponding to minimum monomer voltage, by battery cell gating high and minimum for the voltage of optional position in battery pack extremely balanced bus; Microcontroller sends the pwm signal control LC resonant circuit of a pair state complementation simultaneously, makes its alternation in charging and discharging state.The present invention effectively overcomes because power electronic device exists the problem being difficult to realize battery cell zero-voltage difference that conduction voltage drop causes; Increase euqalizing current, decrease time for balance; Achieve Zero Current Switch equilibrium, decrease energy dissipation; Effectively improve the inconsistency between battery cell, improve equalization efficiency.
Description
Technical field
The present invention relates to a kind of new-energy automobile power control technology, particularly relate to a kind of power battery equalization circuit based on boosting inverter and Sofe Switch and implementation method.
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 need battery cell series connection to use to improve electric pressure.But battery cell is in manufacturing process, and due to reasons such as techniques, capacity, internal resistance etc. with batch battery there are differences; In use, the difference of battery self discharge 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 is in this inconsistent state for a long time, except affecting the useful life of battery, also easily causes cell damage, even blast.In order to eliminate the inhomogeneities of battery cell, need to carry out equilibrium to battery.At present, equilibrium mainly contains energy-dissipating and the large class of energy non-dissipative type two.
Energy-dissipating carries out electric discharge shunting by giving the resistance in parallel of each cell in battery pack, thus realizes balanced.Energy non-dissipative type circuit adopts electric capacity, inductance as energy-storage travelling wave tube, utilizes common power converting circuit as underlying topology, takes the structure of disperseing or concentrating, realizes unidirectional or two-way charging scheme.
Energy-dissipating circuit structure is simple, by carrying out electric discharge shunting to the resistance in parallel of each cell in battery pack, thus realizing balanced, there is 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 underlying topology, take the structure of disperseing or concentrating, realize unidirectional or two-way charging scheme, there is circuit structure complexity, volume is large, cost is high, time for balance is long, the shortcoming such as high switching loss.
Chinese invention patent application (application number 201010572115.X) discloses a kind of equalizing resistance that utilizes and carries out balanced circuit to battery in battery pack monomer, 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 gathered, then controlling resistance commutation circuit is by parallel for battery cell higher to equalizing resistance and electricity, discharges to this battery cell, thus realizes battery cell electric quantity balancing.This circuit limits battery cell overtension by the mode of energy ezpenditure in fact, is suitable only in static equilibrium, there is the problem of energy dissipation and heat management.
Chinese invention patent application (application number 201210595724.6) proposes a kind of capacitive battery equalization circuit, and two batteries that this circuit is often adjacent share an electric capacity, and when the battery cell that electric capacity and voltage are higher is in parallel, battery is to capacitor charging; When the battery cell that electric capacity and voltage are lower is in parallel, electric capacity charges the battery.Through the charge and discharge of electric capacity, energy transfers to the lower battery cell of voltage from the battery cell that voltage is higher, thus makes its voltage equal.But when series-connected cell amount of monomer is more, required balanced electric capacity and field effect transistor and drive circuit more, cause circuit bulky, and when the adjacent multiple monomer of the battery that voltage is high and minimum, the balanced way of this " passing the flower while the drum is beaten ", makes equalization efficiency greatly to reduce.
Chinese invention patent application (application number 201310278475.2) proposes a kind of electrokinetic cell Zero current switch active equalization circuit and implementation method, it can voltage is high and minimum in real-time judge battery pack battery cell, and Zero Current Switch equilibrium is carried out to it, and each equilibrium is all carry out peak load shifting for two battery cells that voltage difference in battery pack is maximum, greatly improve equalization efficiency, effectively reduce the inconsistency between battery cell.But because used power electronic device exists conduction voltage drop, make to be difficult between battery cell reach zero-voltage difference, and euqalizing current is very little, time for balance is longer.
The open circuit voltage of lithium ion battery is comparatively smooth when SOC is between 30%-70%, and (SOC is the state-of-charge of battery, during SOC=100%, expression battery is full power state), even if SOC differs greatly, the voltage difference of its correspondence is also very little, and therefore traditional equalization methods euqalizing current is less, and there is conduction voltage drop due to power electronic device, make to be difficult between battery cell reach zero-voltage difference, and be operated in hard switching state due to power electronic device, switching loss is higher.
Summary of the invention
Object of the present invention is exactly to solve the problem, a kind of power battery equalization circuit based on boosting inverter and Sofe Switch and implementation method are proposed, this equalizing circuit can realize Zero Current Switch euqalizing current, overcome the problem that there is voltage difference between battery cell, reduce energy dissipation, improve equalization efficiency.
To achieve these goals, the present invention adopts following technical scheme:
A kind of power battery equalization circuit based on boosting inverter and Sofe 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 model calling LC resonant circuit, LC resonant circuit is by balanced bus connecting valve module; Wherein,
Described microcontroller comprises analog-to-digital conversion module, drive circuit and general purpose I/O end;
Described analog-to-digital conversion module, with battery cell and BOOST boosting inverter model calling, for converting the voltage signal of battery cell to digital signal, thus determines the battery cell that voltage is high and minimum;
The pulse width modulation (PWM) signal output part of described drive circuit connects BOOST boosting inverter module, for generation of control drive singal;
Described general purpose I/O end is connected with switch module, the most high monomer voltage determined for decoding microcontroller and battery numbering corresponding to minimum monomer voltage, control switch module is by battery cell gating high and minimum for the voltage of optional position in battery pack extremely balanced bus.
Described BOOST boosting inverter module comprises an inductance L
b, a metal-oxide-semiconductor M
b, a diode D
bwith a bulky 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
2driven by a road PWM+ signal, metal-oxide-semiconductor M
3and M
4the PWM-signal reverse by another line state drives, 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 charging and discharging two states.
Described charged state is LC resonant circuit and BOOST boosting inverter wired in parallel.
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 that voltage difference in battery pack is maximum.
Apply an implementation method for the above-mentioned power battery equalization circuit based on boosting inverter and Sofe Switch, comprise the following steps:
(1) obtain monomer voltage: microcontroller, by analog-to-digital conversion module, obtains electrokinetic cell each monomer voltage, thus determine the battery cell numbering of most high monomer voltage and minimum monomer voltage and correspondence;
(2) voltage is judged: microcontroller, according to the highest and minimum battery cell voltage obtained, calculates maximum monomer voltage poor, if difference is greater than battery balanced threshold value, then starts equalizing circuit;
(3) gating battery: microcontroller by decoding circuit by most high monomer voltage and battery cell numbering decoding corresponding to minimum monomer voltage, control switch module by most high monomer voltage and battery cell gating corresponding to minimum monomer voltage to balanced bus;
(4) energy transferring: battery cell the highest for voltage is boosted to a higher voltage by microprocessor controls BOOST boosting inverter module, control LC resonant circuit makes its alternation in charging and discharging two states simultaneously, thus realizes the continuous transmission of energy.
In described step (4), when LC resonant circuit and BOOST boosting inverter wired in parallel, BOOST boosting inverter module is charged to LC resonant circuit, when the battery cell that LC resonant circuit and voltage are minimum is in parallel, LC resonant circuit charges to battery cell, along with the charge and discharge of LC resonant circuit, achieve energy and transfer to the lower battery cell of voltage from the battery cell that voltage is higher.
Operation principle of the present invention is:
Microcontroller according to most high monomer voltage and battery cell numbering corresponding to minimum monomer voltage, through general purpose I/O end encoded control switch module, by battery cell gating high and minimum for the voltage of optional position in battery pack extremely balanced bus; Then, battery cell the highest for voltage is boosted to a higher voltage by microprocessor controls BOOST boosting inverter module, overcomes because power electronic device exists the problem being difficult to realize battery cell zero-voltage difference that conduction voltage drop causes; Microcontroller sends the pwm signal control LC resonant circuit of a pair state complementation simultaneously, makes its alternation in charging and discharging two states.Especially, when the PWM frequency that microcontroller sends equals the natural resonance frequency of LC resonant circuit, can realize Zero Current Switch equilibrium, and each equilibrium is all carry out peak load shifting for two battery cells that voltage difference in battery pack is maximum, greatly improves equalization efficiency.
Beneficial effect of the present invention is:
(1) effectively overcome because power electronic device exists the problem being difficult to realize battery cell zero-voltage difference that conduction voltage drop causes;
(2) increase euqalizing current, decrease time for balance;
(3) realize Zero Current Switch equilibrium, reduce energy dissipation;
(4) effectively improve the inconsistency between battery cell, improve equalization efficiency.
Accompanying drawing explanation
Fig. 1 is composition schematic diagram of the present invention;
Fig. 2 is LC resonant circuit of the present invention charging fundamental diagram;
Fig. 3 is LC resonant circuit of the present invention electric discharge fundamental diagram;
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 equalization efficiency figure 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 Sofe Switch, comprise microcontroller 5, switch module, BOOST boosting inverter module 6 and LC resonant circuit 7, microcontroller 5 connecting valve module, LC resonant circuit 7 and BOOST boosting inverter module 6, BOOST boosting inverter module 6 connects LC resonant circuit 7, LC resonant circuit 7 by balanced bus connecting valve module ii 11; Wherein,
Microcontroller 5 comprises analog-to-digital conversion module, drive circuit 8 and general purpose I/O end;
Analog-to-digital conversion module is used for converting the voltage signal of battery cell 3 to digital signal, thus determines the battery cell 3 that voltage is high and minimum;
The pulse width modulation (PWM) signal output part of drive circuit 8 connects BOOST boosting inverter module 6, for generation of control drive singal;
General purpose I/O end is connected with switch module, the most high monomer voltage determined for decoding microcontroller 5 and battery cell 3 corresponding to minimum monomer voltage are numbered, and control switch module is by battery cell 3 gating high and minimum for the voltage of optional position in battery pack to balanced bus.
BOOST boosting inverter module 6 comprises an inductance L
b, a metal-oxide-semiconductor M
b, a diode D
bwith a bulky capacitor C
b.BOOST boosting inverter module 6 is for exporting a higher voltage to realize the zero-voltage difference between the balanced and battery cell 3 of big current, particularly, microcontroller 5 sends the metal-oxide-semiconductor in a road pwm signal driving BOOST boosting inverter module 6, and adopt the control mode of closed loop PID to regulate the duty ratio of described PWM, make BOOST boosting inverter module 6 export one and stablize and higher voltage.
Balanced bus comprises balanced bus I4 and balanced bus II2, and switch module comprises switch module I1 and is connected BOOST boosting inverter module 6 and switch module I1 with the balanced bus I4 of switch module II11; Balanced bus II2 connecting valve module ii 11 and LC resonant circuit 7.
LC resonant circuit 7 comprises four metal-oxide-semiconductors, four diodes and a lc circuit, wherein metal-oxide-semiconductor M
1and M
2driven by a road PWM+ signal, M
3and M
4the PWM-signal reverse by another line state drives, diode D
1-D
4play reverse flow limiting.Under this pwm signal to state complementation drives, LC resonant circuit 7 alternation is in charging and discharging two states, charging is namely in parallel with the BOOST boosting inverter module 6 of balanced bus I4 with connection, and the battery cell 3 that the voltage that namely electric discharge is connected with balanced bus II2 with connection is minimum is in parallel.Especially, when the pwm signal frequency that microcontroller 5 sends equals the natural resonance frequency of LC resonant circuit 7, realize Zero Current Switch equilibrium, and each equilibrium is all carry out for two battery cells 3 that voltage difference in battery pack is maximum, greatly improve equalization efficiency, effectively improve the inconsistency between battery cell 3 by means of BOOST boosting inverter module 6 simultaneously.
Apply an implementation method for the above-mentioned power battery equalization circuit based on boosting inverter and Sofe Switch, comprise the following steps:
(1) obtain battery cell 3 voltage: microcontroller 5, by analog-to-digital conversion module, obtains each monomer voltage of electrokinetic cell, thus determine that the battery cell 3 of most high monomer voltage and minimum monomer voltage and correspondence is numbered;
(2) voltage is judged: microcontroller 5, according to the highest and minimum battery cell voltage obtained, calculates maximum monomer voltage poor, if difference is greater than battery balanced threshold value, then starts equalizing circuit;
(3) gating battery: the most high monomer voltage that microcontroller 5 is determined by decoding circuit and battery cell 3 corresponding to minimum monomer voltage are numbered, control switch module by most high monomer voltage and battery cell gating corresponding to minimum monomer voltage to balanced bus;
(4) energy transferring: battery cell 3 the highest for voltage is boosted to a higher voltage by microcontroller 5 control BOOST boosting inverter module 6, control LC resonant circuit 7 makes its alternation in charging and discharging two states simultaneously, thus realizes 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 gives LC resonant circuit charging 7, when the battery cell 3 that LC resonant circuit 7 and voltage are minimum is in parallel, LC resonant circuit 7 charges to battery cell 3, along with the charge and discharge of LC resonant circuit 7, achieve energy and transfer to the lower battery cell of voltage 3 from the battery cell 3 that voltage is higher.
Embodiment one:
For 6 batteries monomers 3, and suppose B
1for the battery cell 3, B that voltage is the highest
4for the battery cell 3 that voltage is minimum.
Digital Signal Processing DSP(TMS320F28335 selected by the microcontroller 5 of equalizing circuit), there is high-precision AD sampling and PWM output; Multi-channel gating switch 9 selects CD4051, is single 8 passages numeral control simulation electronic switches, have A, B and C tri-binary system control input ends 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 measurement chip to measure the voltage of every batteries in battery pack in real time.
Switch module I1, switch module II11 select the relay with a pair normally opened contact, and its model is (S in HJR1-2CL-05V, Fig. 1
x, Q
x) or (S '
x, Q '
x) be a pair normal open switch.Microcontroller 5 controls its conducting or closed 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 bulky capacitor C
bcomposition.BOOST boosting inverter module 6 operates mainly in charging and discharging two states: when metal-oxide-semiconductor conducting, battery cell 3 starts inductance L
bcharging, along with the increase of inductive current, the energy stored 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, boost process is exactly the energy transfer process of an inductance.During charging, inductance absorbs energy, and during electric discharge, inductance releases energy.If electric capacity is enough large, so a lasting electric current just can be kept at output in discharge process.Can be regulated the size of BOOST boosting inverter module 6 output voltage by the duty ratio controlling metal-oxide-semiconductor conducting, the duty ratio that the present invention adopts closed loop PID controller to control metal-oxide-semiconductor conducting makes BOOST boosting inverter module 6 output voltage remain on about 7.5V.
LC resonant circuit 7 is by four metal-oxide-semiconductor M
1-M
4, four diode D
1-D
4with an inductance L, an electric capacity C circuit composition.Wherein, M
1, M
2, D
1, D
2charge circuit is formed with L, C; M
3, M
4, D
3, D
4discharge loop is formed with L, C.M
1source electrode, D
2negative pole respectively with electric capacity C in BOOST boosting inverter module 6
bpositive and negative electrode be connected; D
3negative pole, M
4source electrode respectively with balanced bus II2 positive and negative electrode be connected.Diode D
1-D
4play isolation.Metal-oxide-semiconductor M
1-M
4driven by the pwm signal of a pair state complementation from microcontroller 5DSP, wherein M
1and M
2driven by a road PWM+ signal, M
3and M
4driven by the PWM-signal of 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, energy can be realized by the continuous charge and discharge of LC resonant circuit 7 and be transferred to the minimum battery cell of voltage 3 from the battery cell 3 that voltage is the highest, especially, when the PWM frequency that microcontroller 5 sends equals the natural resonance frequency of LC quasi-resonance circuit 7, Zero Current Switch equilibrium is realized.
First, microcontroller 5 is by analog-to-digital conversion module, obtain each monomer voltage of electrokinetic cell, thus determine that the battery cell 3 of most high monomer voltage and minimum monomer voltage and correspondence is numbered, 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 balanced end, respectively by battery cell B the highest for voltage
1with the battery cell B that voltage is minimum
4on gating 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 battery cell B the highest for voltage
1boost to about 7.5V.
Meanwhile, control LC resonant circuit 7 makes its alternation in charging and discharging two states, thus realizes the continuous transmission of energy.
As shown in Figure 2, M is worked as
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 electric capacity C form a resonant tank, now charge, resonance current i is just, the voltage V at electric capacity C two ends
cstart to rise until resonance current i becomes negative value, as seen from Figure 3, V
cdelayed resonance current i tetra-/one-period, and waveform is sine wave.This moment, due to M
3and M
4be in off state, battery cell B
4open circuit, so flow into B
4current i
b4be zero; Again because microcontroller 5 control BOOST boosting inverter module 6 output voltage stabilization is at about 7.5V, so the resonance current i flowing into LC is flow out battery cell B
1electric current, and rated current flow out battery cell time be just, therefore can obtain the B shown in state I as shown in Figure 4
1and B
4current waveform.
As shown in Figure 3, M is worked as
3and M
4during conducting, M
1and M
2turn off, LC resonant circuit 7 passes through the minimum battery cell B of switch module I1, switch module II11 and voltage
4in parallel.B
4, L and C form a resonant tank, now discharge, resonance current i is negative, the voltage V at electric capacity C two ends
cstart decline until resonance current become on the occasion of.Because BOOST boosting inverter module 6 is in open-circuit condition, therefore flow 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 equalization efficiency measured is up to 98.6%.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but 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 amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (7)
1. the power battery equalization circuit based on boosting inverter and Sofe 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 model calling LC resonant circuit, LC resonant circuit is by balanced bus connecting valve module; Wherein,
Described microcontroller comprises analog-to-digital conversion module, drive circuit and general purpose I/O end;
Described analog-to-digital conversion module, with battery cell and BOOST boosting inverter model calling, for converting the voltage signal of battery cell to digital signal, thus determines the battery cell that voltage is high and minimum;
The pulse width modulation (PWM) signal output part of described drive circuit connects BOOST boosting inverter module, for generation of control drive singal;
Described general purpose I/O end is connected with switch module, the most high monomer voltage determined for decoding microcontroller and battery numbering corresponding to minimum monomer voltage, control switch module is by battery cell gating high and minimum for the voltage of optional position in battery pack extremely balanced bus;
Described balanced bus comprises balanced bus I and balanced bus II, and 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;
LC resonant circuit comprises four metal-oxide-semiconductor M
1, M
2, M
3and M
4, four diode D
1, D
2, D
3and D
4, an inductance L and an electric capacity C, M
1, M
2, D
1, D
2charge circuit is formed with L, C; M
3, M
4, D
3, D
4discharge loop is formed with L, C; M
1source electrode connect the anode of D1, the negative electrode of D1 connects L one end and M3 drain electrode respectively, and the L other end connects C positive pole, and C negative pole connects D4 negative electrode and M2 drain electrode respectively, and M2 source electrode connects D2 positive pole, and D2 negative pole connects the negative pole of BOOST boosting inverter module capacitance, M
1drain electrode be connected with the positive pole of BOOST boosting inverter module capacitance, M3 source electrode connects D3 positive pole, and D4 positive pole connects M4 source electrode, and M4 drain electrode is connected with balanced bus II negative pole, D
3negative pole is connected with balanced bus II positive pole, and the grid of M1, M2, M3, M4 connects drive circuit; Wherein metal-oxide-semiconductor M
1and M
2driven by a road PWM+ signal, M
3and M
4the PWM-signal reverse by another line state drives, four diode D
1, D
2, D
3and D
4play reverse flow limiting.
2. a kind of power battery equalization circuit based on boosting inverter and Sofe 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 charging and discharging two states.
3. a kind of power battery equalization circuit based on boosting inverter and Sofe Switch as claimed in claim 2, is characterized in that: described charged state is LC resonant circuit and BOOST boosting inverter wired in parallel.
4. a kind of power battery equalization circuit based on boosting inverter and Sofe Switch as claimed in claim 2, is characterized in that: described discharge condition is that the battery cell that LC resonant circuit is minimum with voltage is in parallel.
5. a kind of power battery equalization circuit based on boosting inverter and Sofe 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 that voltage difference in battery pack is maximum.
6. the implementation method of the power battery equalization circuit based on boosting inverter and Sofe Switch as described in any one of claim 1-5, is characterized in that: comprise the following steps:
(1) obtain monomer voltage: microcontroller, by analog-to-digital conversion module, obtains electrokinetic cell each monomer voltage, thus determine the battery cell numbering of most high monomer voltage and minimum monomer voltage and correspondence;
(2) voltage is judged: microcontroller, according to the highest and minimum battery cell voltage obtained, calculates maximum monomer voltage poor, if difference is greater than battery balanced threshold value, then starts equalizing circuit;
(3) gating battery: the most high monomer voltage that microcontroller is determined by decoding circuit and battery cell numbering corresponding to minimum monomer voltage, control switch module by most high monomer voltage and battery cell gating corresponding to minimum monomer voltage to balanced bus;
(4) energy transferring: battery cell the highest for voltage is boosted to a higher voltage by microprocessor controls BOOST boosting inverter module, control LC resonant circuit makes its alternation in charging and discharging two states simultaneously, thus realizes the continuous transmission of energy.
7. a kind of implementation method as claimed in claim 6, it is characterized in that: in described step (4), when LC resonant circuit and BOOST boosting inverter wired in parallel, 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 battery cell that LC resonant circuit and voltage are minimum is in parallel, LC resonant circuit charges to battery cell, along with the charge and discharge of LC resonant circuit, achieve energy and transfer to the lower battery cell of voltage from the battery cell that voltage is higher.
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