CN203607875U - A power battery pack equalization circuit based on boost conversion and soft switching - Google Patents
A power battery pack equalization circuit based on boost conversion and soft switching Download PDFInfo
- Publication number
- CN203607875U CN203607875U CN201320660950.8U CN201320660950U CN203607875U CN 203607875 U CN203607875 U CN 203607875U CN 201320660950 U CN201320660950 U CN 201320660950U CN 203607875 U CN203607875 U CN 203607875U
- Authority
- CN
- China
- Prior art keywords
- module
- voltage
- circuit
- equalization
- boosting inverter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a power battery pack equalization circuit based on boost conversion and soft switching. The equalization circuit mainly comprises a microcontroller, a switch module, a BOOST (boost) transformation module and an LC resonance circuit. According to single battery numbers correspond to a highest single voltage and a lowest single voltage, and the single batteries correspond to the highest single voltage and the lowest single voltage at any position of a battery pack are subjected to gating carried out by the microcontroller to an equalization bus; simultaneously, the microcontroller transmits a pair of PWM signals which are complementary to each other in terms of states to control the LC resonance circuit; and the LC resonance circuit is made to work in charging and discharging states alternatively. According to the utility model, problems that a zero voltage difference of the single batteries is difficult to realize due to a conduction pressure drop of an electric power electronic device are effectively overcome; equalization currents are increased; the equalization time is reduced; zero current switch equalization is realized; energy waste is reduced; the inconsistence among the single batteries is effectively reduced; and the equalization efficiency is raised.
Description
Technical field
The utility model relates to a kind of new-energy automobile power control technology, relates in particular to a kind of power battery equalization circuit 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.But battery cell, in manufacturing process, due to reasons such as techniques, there are differences with capacity, the internal resistance etc. of batch battery; 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 circuit structure complexity, a shortcoming such as 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, by parallel battery cell higher with electric weight equalizing resistance, given this battery cell electric discharge, thereby realized battery cell electric quantity balancing.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 in the time that the electric capacity battery cell higher with voltage is in parallel, battery is to capacitor charging; In the time that 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 in the time of the high and minimum adjacent multiple 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 to carry out peak load shifting for two battery cells of voltage difference maximum in battery pack, 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, when 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
The purpose of this utility model is exactly in order to address the above problem, a kind of power battery equalization circuit based on boosting inverter and soft switch is 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 utility model 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, microcontroller comprises analog-to-digital conversion module, drive circuit and general purpose I/O end; Analog-to-digital conversion module connecting single batteries, BOOST boosting inverter module, the pulse width modulation (PWM) signal output part of drive circuit connects BOOST boosting inverter module; General purpose I/O end is connected with switch module.
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.
Operation principle of the present utility model is:
Microcontroller is according to 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 the voltage of optional position in battery pack extremely on balanced bus; Then, battery cell the highest voltage is boosted to a higher voltage by microprocessor controls BOOST boosting inverter module, 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 equilibrium is all to carry out peak load shifting for two battery cells of voltage difference maximum in battery pack at every turn, has greatly improved balanced efficiency.
The beneficial effects of the utility model are:
(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 utility model;
Fig. 2 is LC resonant circuit charging fundamental diagram of the present utility model;
Fig. 3 is LC resonant circuit electric discharge fundamental diagram of the present utility model;
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 utility model is described in further detail.
As shown in Figure 1, a kind of power battery equalization circuit based on boosting inverter and soft switch, mainly comprise microcontroller 5, switch module, BOOST boosting inverter module 6 and LC resonant circuit 7, microcontroller 5 connecting valve modules 1, 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, drives signal for generation of controlling;
General purpose I/O end is connected with switch module, high monomer voltage and battery cell 3 corresponding to minimum monomer voltage determined for decoding microcontroller 5 are numbered, and control switch module is by battery cell 3 gatings high and minimum 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 between large current balance and battery cell 3, 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 BOOST boosting inverter module 6 export a stable and higher voltage.
Balanced bus comprises balanced bus I4 and balanced bus II2, and switch module comprises that the balanced bus I4 of switch module I1 connects BOOST boosting inverter module 6 and switch module I1; 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
2you Yi road PWM
+signal driver, M
3and M
4by the reverse PWM-signal driver of another line state, diode D
1-D
4play reverse flow limiting.Under this pwm signal to state complementation drives, 7 alternations of LC resonant circuit are at two states of charging and discharging, charge in parallel with the BOOST boosting inverter module 6 of balanced bus I4 with connection, minimum battery cell 3 parallel connections of voltage that electric discharge is connected with balanced bus II2 with connection.Especially, when the pwm signal frequency of sending when microcontroller 5 equals the natural resonance frequency of LC resonant circuit 7, realize Zero Current Switch equilibrium, and each equilibrium is all to carry out for two battery cells 3 of voltage difference maximum in battery pack, greatly improve balanced efficiency, effectively improved the inconsistency of 3 of battery cells by means of BOOST boosting inverter module 6 simultaneously.
Embodiment mono-:
Take 6 batteries monomers 3 as example, and suppose that B1 is the battery cell 3 that voltage is the highest, B4 is the battery cell 3 that voltage is minimum.
The microcontroller 5 of equalizing circuit is selected Digital Signal Processing DSP(TMS320F28335), there is high-precision AD sampling and PWM output; Multi-channel gating switch 9 is selected CD4051, is single 8 passage numeral control simulation electronic switches, has tri-binary system control input ends of A, B and C and EN totally 4 inputs, has low conduction impedance and very low cut-off leakage current; Voltage detecting circuit 10 adopts the LTC6802 specialized voltages measurement chip of Linear Tech to measure in real time the voltage of every batteries in battery pack.
Switch module is selected 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
bcomposition.BOOST boosting inverter module 6 operates mainly in two states of charging and discharging: in the time of 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
bwhen 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.When charging, inductance absorbs energy, and when electric discharge, inductance is emitted energy.If electric capacity is enough large, just can in discharge process, keep a lasting electric current at output so.Can regulate the size of BOOST boosting inverter module 6 output voltages by controlling the duty ratio of metal-oxide-semiconductor conducting, the utility model adopts the duty ratio of closed loop PID control device control metal-oxide-semiconductor conducting to make 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 respectively with balanced bus II2 positive and negative electrode be connected.Diode D1-D4 plays 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
4by the PWM of another line state complementation
-signal driver.Work as M
1and M
2conducting, M
3and M
4when shutoff, LC resonant circuit and 7 is operated in charged state; Work as M
3and M
4conducting, M
1and M
2when shutoff, LC resonant circuit 7 is operated in discharge condition.So, can realize energy by the continuous charge and discharge of LC resonant circuit 7 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 the each monomer voltage of electrokinetic cell, thereby determine that high monomer voltage and minimum monomer voltage and corresponding battery cell 3 number, and judge whether maximum voltage difference is greater than battery balanced threshold value, start equalizing circuit if be greater than, 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 battery cell B the highest 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 the control of PID controller, and BOOST boosting inverter module 6 is by battery cell B the highest 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
2when 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, be outflow battery cell B so flow into the resonance current i of LC again
1electric current, and rated current flows out when battery cell for just, therefore 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
4when conducting, M
1and M
2turn-off, LC resonant circuit 7 is by switch module 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 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
7when=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%.
By reference to the accompanying drawings embodiment of the present utility model is described although above-mentioned; but the not restriction to the utility model protection range; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection range of the present utility model.
Claims (2)
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, microcontroller comprises analog-to-digital conversion module, drive circuit and general purpose I/O end; Analog-to-digital conversion module connecting single batteries, BOOST boosting inverter module, the pulse width modulation (PWM) signal output part of drive circuit connects BOOST boosting inverter module; General purpose I/O end is connected with switch module.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320660950.8U CN203607875U (en) | 2013-10-24 | 2013-10-24 | A power battery pack equalization circuit based on boost conversion and soft switching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320660950.8U CN203607875U (en) | 2013-10-24 | 2013-10-24 | A power battery pack equalization circuit based on boost conversion and soft switching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203607875U true CN203607875U (en) | 2014-05-21 |
Family
ID=50720535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320660950.8U Expired - Fee Related CN203607875U (en) | 2013-10-24 | 2013-10-24 | A power battery pack equalization circuit based on boost conversion and soft switching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203607875U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105874683A (en) * | 2014-10-08 | 2016-08-17 | 株式会社Lg化学 | Battery cell balancing system and method using lc resonance |
-
2013
- 2013-10-24 CN CN201320660950.8U patent/CN203607875U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105874683A (en) * | 2014-10-08 | 2016-08-17 | 株式会社Lg化学 | Battery cell balancing system and method using lc resonance |
| CN105874683B (en) * | 2014-10-08 | 2019-06-18 | 株式会社Lg 化学 | Use the battery unit balancing system and method for LC resonance |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103532197B (en) | Based on power battery equalization circuit and the implementation method of boosting inverter and Sofe Switch | |
| CN103296731B (en) | Zero current switch active equalization circuit of power batteries and implementation method | |
| CN103956802A (en) | Switch matrix and LC resonant transformation based cells to cells equalization circuit and method | |
| CN104410133B (en) | Equalization circuit based on Buck-Boost convertor and bidirectional LC (inductance capacitance) resonant convertor as well as implementation method | |
| CN103956801B (en) | A kind of Pack to Cell equalizing circuit based on LC resonant transformation and implementation method | |
| CN203840033U (en) | Cells to cells equalization circuit based on switch matrix and LC resonant conversion | |
| CN203660604U (en) | Power battery equalization management system of electric automobile | |
| CN106712211A (en) | Multi-input transformation-based dual-layer active balance circuit and implementation method | |
| CN102163854A (en) | Charge-discharge equalizing circuit of multi-monomer tandem dynamic lithium battery | |
| CN104953659B (en) | A kind of battery set charge/discharge equalizing circuit and charging/discharging thereof | |
| CN104377778B (en) | Adjacent-Cell-to-Cell equalizing circuit based on LCL resonant transformation and implementation method | |
| CN105391130B (en) | Battery equalizing circuit and its control method based on multiphase interleaved converter | |
| CN204304528U (en) | Based on Buck-Boost conversion and the equalizing circuit of two-way LC resonant transformation | |
| CN105529780B (en) | Adjacent Cell to Cell equalizing circuits and control method based on three resonant condition LC conversion | |
| CN104410136B (en) | Interlaced modular Pack to Cell equalizer circuit and control method | |
| CN104868532A (en) | Cuk chopper circuit bidirectional arm-based series storage cell pack bidirectional energy equalizer and control method thereof | |
| CN101867210A (en) | Series power storage battery energy non-dissipative type equalization charging circuit | |
| CN103970022A (en) | GM (1, N) grey forecasting model-based balancing control method | |
| CN209217738U (en) | A kind of active equalization of battery device containing forward converter | |
| CN103956800A (en) | Self-adaptive fuzzy balancing control method based on historical balancing speed | |
| CN110649337A (en) | Novel lithium ion battery Cell-to-Cell modular equalization circuit based on single inductor and control method | |
| CN203859563U (en) | Pack to Cell equalization circuit based on LC resonant conversion | |
| CN204304529U (en) | A kind of Pack to Cell equalizing circuit of deinterleaving block | |
| CN203607875U (en) | A power battery pack equalization circuit based on boost conversion and soft switching | |
| CN204376462U (en) | The efficient equalizer topological circuit of a kind of double-deck brachium pontis series-connected batteries |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140521 Termination date: 20151024 |
|
| EXPY | Termination of patent right or utility model |