CN107492924A - Battery equalizing circuit and control method - Google Patents
Battery equalizing circuit and control method Download PDFInfo
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- CN107492924A CN107492924A CN201710664381.7A CN201710664381A CN107492924A CN 107492924 A CN107492924 A CN 107492924A CN 201710664381 A CN201710664381 A CN 201710664381A CN 107492924 A CN107492924 A CN 107492924A
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 230000005611 electricity Effects 0.000 claims description 19
- 238000005070 sampling Methods 0.000 claims description 10
- 230000009123 feedback regulation Effects 0.000 claims description 6
- 230000000737 periodic effect Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
-
- H02J2007/0067—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a kind of battery equalizing circuit and control method, the battery equalizing circuit includes selection circuit and battery discharging circuit, the selection circuit receives the battery voltage signal characterized per batteries both end voltage difference, and therefrom selects the battery voltage signal of maximum；The battery discharging circuit is when the maximum voltage signal reaches threshold voltage, then to the battery discharge corresponding to the maximum voltage signal.The maximum battery discharge of present invention selection voltage, circuit caloric value substantially reduces, so as to improve circuit safety performance and battery.
Description
Technical field
The present invention relates to electric and electronic technical field, and in particular to a kind of battery equalizing circuit and control method.
Background technology
One battery pack includes multiple batteries, the problem of due to actual production technique, has difference between each cell
Different, battery set charge/discharge process will also result in the difference of voltage and capacity in every batteries.The battery equalizing circuit of prior art,
By taking four batteries as an example, a series circuit in parallel per batteries, each series circuit includes a current source and one is opened
Close series connection.Voltage in 4 batteries is sampled, exports after comparison circuit and is each opened in 4 each series circuits of switching signals control
The break-make of pass.
The selection circuit schematic diagram of prior art battery equalizing circuit is as shown in figure 1, the selection circuit includes four ratios
Compared with device U101, U102, U103 and U104.By sample obtain four economize on electricity cell voltages respectively at setting balanced turn-on threshold voltage
Vref compares, and output control signal V101, V102, V103 and V104 go control with being opened in the series circuit of cell parallel respectively
The break-make of pass.When voltage is more than Vref in certain batteries, corresponding comparator output high level controls the battery parallel circuit
On switch closure, now the battery on corresponding parallel circuit current source discharge.When the cell voltage drops to
During weighing apparatus turn-on threshold voltage Vref, switching off on battery parallel circuit described in corresponding comparator output low level control.By
Simultaneously greater than balanced turn-on threshold voltage Vref is possible in voltage on each battery, thus this battery equalizing circuit can be present
The situation that multiple batteries discharge to current source on corresponding parallel circuit simultaneously, it is big to easily cause heat on circuit, cause circuit safety,
The problem of reducing battery and shortening battery durable mileage.
The content of the invention
In view of this, it is existing for solving it is an object of the invention to provide a kind of multiple batteries equalizing circuit and control method
There is the problem of circuit safety existing for technology, battery are low and battery durable mileage is short.
To achieve the above object, the invention provides a kind of battery equalizing circuit, including：
Selection circuit, the battery voltage signal characterized per batteries both end voltage difference is received, and therefrom select the electricity of maximum
Cell voltage signal；
Battery discharging circuit, when the maximum battery voltage signal reaches threshold voltage, then to the maximum electricity
Battery discharge corresponding to cell voltage signal.
Optionally, described selection circuit includes comparison circuit, and the comparison circuit includes one or more comparators, will
Voltage on per batteries is compared by comparator, selects maximum battery voltage.
Optionally, the voltage in every two batteries is compared by described selection circuit, selects larger voltage, will be selected
All larger voltages be compared two-by-two again, by that analogy, until select maximum battery voltage.
Optionally, described selection circuit only needs a comparator, and the comparator both ends receive battery voltage signal,
The constantly battery voltage signal of switching comparator both ends input, until selecting maximum battery voltage.
Optionally, the selection circuit includes differential amplifier circuit and output circuit, the differential amplifier circuit and output
Circuit connects to form negative feedback structure, and described differential amplifier circuit one end inputs battery voltage signal, and other end input is through output
Voltage signal after electronic feedback regulation, the voltage signal after the feedback regulation is maximum battery voltage signal.
Optionally, the differential amplifier circuit includes multiple input pipes and current mirror, and the input pipe inputs cell voltage
Signal, the current mirror outputs connect the multiple input pipe；
Optionally, the output circuit includes multiple efferent ducts and current source, and all efferent ducts are in parallel, the parallel connected end
One terminating load, the load can be resistance or current source, and the voltage of the parallel connected end and the current source common port is most
Big battery voltage.
Optionally, the input pipe and the voltage at current mirror public connecting end for inputting maximum battery voltage are low level, defeated
It is high level to enter the input pipe of non-maximum battery voltage with the voltage of current mirror public connecting end, by judging input pipe and electric current
The voltage swing of mirror public connecting end can select the maximum battery of voltage.
Optionally, the selection circuit includes the current source that mirror image circuit and output circuit and cell voltage are converted into, institute
State mirror image circuit, output circuit connects to form negative feedback structure with current source.
Optionally, the mirror image circuit includes the first mirror image pipe and multiple second mirror image pipes, and all mirror image circuits share the
One mirror image pipe, the current source characterize corresponding cell voltage：After feedback regulation, the electric current for flowing through the first mirror image pipe is
Maximum input current, the maximum input current characterize maximum battery voltage.
Optionally, the current source is connected with the mirror image circuit output end, the electric current of the maximum battery voltage conversion
Source is high level with the voltage at mirror image circuit public connecting end, and other current sources are low with the voltage at mirror image circuit common port
Level, by judging that each current source and the voltage swing at mirror image circuit common port can select the maximum battery of voltage.
Optionally, the battery discharging circuit includes multiple battery discharge modules, the corresponding battery discharge of each battery
Module.
Optionally, the battery discharge module includes switch and resistance or switch and current source, the resistance or current source
For to battery discharge；When the maximum battery voltage reaches threshold voltage, the battery discharge mould corresponding to maximum battery voltage
Switch closure in block, the battery discharge corresponding to the maximum battery voltage.
The present invention also provides a kind of battery balanced control method, comprises the following steps：
Voltage in the every batteries of sampling, and therefrom select the voltage signal of maximum；Reach in the maximum voltage signal
During threshold voltage, then to the battery discharge corresponding to the maximum voltage signal；Sampling of the sampling per batteries both end voltage
Mode is that periodic samples or continuity sample.
Compared with prior art, technical scheme has advantages below：Voltage in the every batteries of sampling, and therefrom
Select the voltage signal of maximum；When the maximum voltage signal reaches threshold voltage, then to the maximum voltage signal institute
Corresponding battery discharge.Battery equalizing circuit of the present invention can be integrated in piece, can also be built by discrete device and
Into.The maximum battery discharge of present invention selection voltage, circuit caloric value substantially reduce, so as to improve circuit safety performance and
Battery.
Brief description of the drawings：
Fig. 1 is the selection circuit schematic diagram in prior art battery equalizing circuit；
Fig. 2 is the circuit theory diagrams of battery equalizing circuit of the present invention；
Fig. 3 is the first circuit diagram of selection circuit of the present invention；
Fig. 4 is second of circuit diagram of selection circuit of the present invention；
Fig. 5 is the third circuit diagram of selection circuit of the present invention；
Fig. 6 is the 4th kind of circuit diagram of selection circuit of the present invention；
Embodiment
The preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any replacement made in the spirit and scope of the present invention, modification, equivalent method and scheme.
Thoroughly understand in order that the public has to the present invention, be described in detail in present invention below preferred embodiment specific
Details, and description without these details can also understand the present invention completely for a person skilled in the art.
More specifically description is of the invention by way of example referring to the drawings in the following passage.It should be noted that accompanying drawing is adopted
Non- accurately ratio is used with more simplified form and, only to convenience, lucidly aid in illustrating the embodiment of the present invention
Purpose.
As shown in Fig. 2 the circuit structure of battery equalizing circuit of the present invention is illustrated, and by taking 4 batteries as an example, including battery
Discharge circuit, selection circuit U01, discharge switch pipe S01, charge switch pipe S02 and charger/load module U02.Normal charge and discharge
When electric, S01 and S02 are both turned on；S02 is turned off when there is over-charging of battery or the charging charge fault such as excessively stream, cut-out charger U02 to
The charge circuit of battery pack；There is battery and cross S01 shut-offs when putting or discharge the discharge faults such as excessively stream, cut off battery pack to load
U02 discharge loop.Pack+, Pack- are respectively the positive pole and negative pole of charger/load.Battery discharging circuit is put including 4
Electric module, each battery discharge module include a batteries, a current source (or resistance) and a switch.On per batteries simultaneously
Join a series circuit, the series circuit is made up of a current source and a switching tube.The every batteries both end voltage of sampling,
Voltage is respectively V1, V2, V3 and V4 on per batteries, and exporting 4 switching signals after chosen circuit U 01 controls the series electricals
Each switched on-off in road.
Battery voltage sampling of the present invention is that periodic samples or continuity sample, when the largest battery electricity that sampling obtains
When pressure reaches threshold voltage, the battery discharge corresponding to the maximum battery voltage.
Reference picture 3, illustrates comparison circuit U01 of the present invention the first circuit structure, including four comparator U301,
U302, U303 and U304.For example, V1 and V2 to be selected by comparator U301 to the maximum in V1, V2, V3 and V4 are passed through into ratio
Maximum in V3 and V4 is selected compared with device U303, the maximum in V1 and V2 is selected compared with the maximum in V3 and V4
Maximum Vmax in V1, V2, V3 and V4.The maximum Vmax and threshold voltage Vref is compared by comparator U304
Compared with output comparison signal OUT.When comparison signal OUT is high level, the switch closure on the maximum battery parallel circuit of voltage,
The maximum battery of voltage is discharged by current source.
In addition, comparator U301 two input signals can be the voltage on any two battery, it is assumed that V1, V2, than
An input signal compared with device U302 is the maximum in V1, V2, another input signal hypothesis V3, and one of comparator U303 is defeated
Enter signal for the maximum in V1, V2 and V3, another input signal be V4, a comparator U304 input signal be V1,
Maximum in V2, V3, V4, another input signal are threshold signal.
Reference picture 4, illustrate selection circuit U01 of the present invention second of circuit structure, it is only necessary to a comparator U401.
The maximum in V1, V2, V3, V4 is obtained with a comparator U401 switching input.It is assumed that comparator U401 homophase inputs V1, anti-
Mutually input V2, the maximum voltage in V1, V2, such as V1 are selected according to comparative result OUT.Then by comparator U401 homophase inputs
V1 is switched to, anti-phase input is switched to V3, and the maximum voltage in V1, V2, V3, such as V3 are selected according to comparative result OUT.Then
By comparator U401 with the maximum V3 being mutually switched between V1 and V2 and V3, anti-phase input V4, selected according to comparative result OUT
Maximum voltage in V1, V2, V3, V4, such as V4.Then comparator U401 positives are switched between V1 and V2 and V3 and V4
Maximum V4, anti-phase input threshold voltage Vref, if maximum battery voltage V4 reaches threshold voltage Vref, the maximum electricity of voltage
Tank discharge.Reference picture 4 is listed below formula：
U1=Φ 1+ Φ 2*OUT1+ Φ 3*OUT1*OUT2+ Φ 4*OUT1*OUT2*OUT3
Carried out according to formula (1) as described below：
Φ 1, Φ 2, Φ 3, Φ 4 and u1, u2, u3, u4 are switch controlling signal, and OUT1, OUT2, OUT3 are comparator U401
Output signal, as described below 1 and 0 represents high level and low level respectively, when the switch controlling signal is high level, control
Respective switch closes, otherwise control respective switch disconnects.During Φ 1=1, Φ 2=Φ 3=Φ 4=0, u1=1, u2=u3=u4
=0, comparator U401 homophase input terminate V1, anti-phase input termination V2, export OUT1 and are latched in the finish times of Φ 1, work as V1
During ＜ V2, OUT1=0, otherwise OUT1=1；Switch comparator U401 input signals, during Φ 2=1, Φ 1=Φ 3=Φ 4=0,
It is assumed that comparative result OUT1=1 during Φ 1, then u1=1, u2=u3=u4=0, the normal phase input end of comparator 401 connect V1, negative
Input termination V3；It is assumed that comparative result OUT1=0 during Φ 1, then u2=1, u1=u3=u4=0, comparator U401 positives are defeated
Enter and terminate V2, negative-phase input meets V3.To sum up, during Φ 2 V1 with the maximum in V2 compared with V3.By that analogy, handle during Φ 3
Maximum in V1, V2 and V3 is compared with V4；During Φ 4 the maximum in V1, V2, V3 and V4 compared with threshold voltage Vref,
If maximum battery voltage reaches threshold voltage Vref, the maximum battery discharge of voltage.
Reference picture 5, illustrate the third circuit structure of selection circuit of the present invention, including differential amplifier circuit, output electricity
Road and comparator U601.The differential amplifier circuit includes current mirror, input pipe and current source I601.The current mirror includes ginseng
Examine pipe S605 and mirror image pipe S601, S602, S603, S604；The input pipe S606 and S610, S607 and S610, S608 and
S610, S609 and S610 separately constitute 4 pairs of input pipes, and 4 pairs of input pipes share an input pipe S610.The output circuit includes
Current source I602 and efferent duct S611, S612, S613, S614.Above-mentioned middle S601, S602, S603, S604, S611, S612,
S613, S614 are by taking PMOS as an example, and S606, S607, S608, S609, S610 are by taking NMOS tube as an example.
Difference channel described above connects to form unit gain negative feedback structure with output circuit, specific as follows：The electricity
All mirror image pipes and reference pipe cascade pole in mirror are flowed, the grid connects to drain with reference to pipe S605.4 pairs of input pipes are total to
Source electrode, the source electrode meet current source I601, and input pipe S606, S607, S608 and S609 grid connect 4 cell voltage letters respectively
Number, drain electrode connects current mirror outputs i.e. mirror image pipe S601, S602, S603, S604 drain electrode respectively, and its voltage at node is respectively
VO1, VO2, VO3 and VO4, input pipe S610 drain electrodes connect to drain with reference to pipe S605.4 efferent duct parallel connections of the output circuit,
And the terminating load of parallel connected end one, the load can be resistance or current source, load here by taking current source I602 as an example.Institute
The grid that parallel connected end is also connected with switching tube S610 is stated, voltage is Vm at its common node.Comparator U610 normal phase input ends connect electricity
Press Vm, anti-phase input termination threshold voltage Vref, output end output OUT signal.
It is assumed that voltage at node Vm is more than maximum battery voltage, then reference current and image current are very big, the 4 of output circuit
Individual PMOS grid is pulled up, 4 PMOS shut-offs, and no current in 4 PMOSs, such case does not allow to deposit in circuit
Therefore, pressing Vm to be more than maximum battery voltage at node.It is assumed that voltage V1 ＞ Vm ＞ V2 ＞ V3 ＞ V4 in 4 batteries
When, as image current follows reference current, PMOS S611 grids are pulled down, PMOS S611 conductings, PMOS S612,
S613 and S614 grids are pulled up, PMOS S612, S613 and S614 shut-off.As PMOS S611 grids pull down driving current
Increase, voltage at node Vm rise, and after Vm rises to V1, circuit stability is got off.In addition, voltage at node VO1 is low level,
VO2, VO3, VO4 are high level, and by detecting voltage VO1, VO2, VO3, VO4 size, can to select maximum battery voltage V1 institute right
The battery answered.Selection circuit voltage at node Vm of the present invention may ultimately reach maximum battery voltage, by the maximum electricity
Cell voltage Vm is compared with threshold voltage Vref, when Vm reaches threshold voltage Vref, the maximum battery discharge of voltage.
Reference picture 6, illustrate the 4th kind of circuit structure of selection circuit of the present invention, including mirror image circuit, output circuit, electricity
Stream source, current mirror U701, resistance R2 comparators U702, the mirror image circuit include the first mirror image pipe S705, the second mirror image pipe
S701, S702, S703, S704 and resistance R1, the output circuit include multiple efferent duct S706, S707, S708, S709, institute
Stating current source includes I701, I702, I703, I704, respectively sign cell voltage V1, V2, V3, V4, I1~4=V1~4/R2.More than
Described the first mirror image pipe, the second mirror image pipe, efferent duct are by taking NMOS tube as an example.
Mirror image circuit described above, output circuit connect to form negative feedback structure with current source, and specific connected mode is as follows：
First mirror image pipe of the mirror image circuit and the second mirror image pipe cascade pole, the common source ground connection, the common gate connect one
It is grounded after resistance R1, the common gate voltage at node is Vml, and the electric current for flowing through the first mirror image pipe S705 is designated as Im, the first mirror
Image tube S705, which drains, connects current mirror U701 inputs, current mirror U701 output terminating resistor R2 one end, voltage at its common node
It is designated as Vm.Second mirror image pipe S701, S702, S703, S704 drains connects current source I701, I702, I703, I704 one end respectively
With efferent duct S706, S707, S708, S709 grid, voltage is respectively VP1, VP2, VP3, VP4 at its common node.Output
Pipe S706, S707, S708, S709 common source common drain, the common source connect the common gate of the mirror image circuit, and the common drain connects
Power vd D.Comparator U702 normal phase input ends connect voltage Vm, anti-phase input termination threshold voltage Vref, output end output signal
OUT。
It is assumed that flow through the electric current Im ＞ I701 ＞ I702 ＞ I703 ＞ I704 on the first mirror image pipe S705, then each second mirror image
Leakage current is respectively greater than I701, I702, I703 and I704 on pipe, and efferent duct S706, S707, S708, S709 grid is pulled down, defeated
Outlet pipe S706, S707, S708, S709 are turned off, and such case does not allow to exist.It is assumed that electric current I701 ＞ Im ＞ I702 ＞ I703 ＞
I704, efferent duct S706 grids are pulled up, and efferent duct S707, S708, S709 grid is pulled down, efferent duct S706 conductings, output
Pipe S707, S708, S709 are turned off, and as efferent duct S706 grid pulling drives electric current increases, voltage Vml increases, flow through first
Until circuit reaches stable state, now electric current Im is equal to current source I701 sizes, i.e., electric for mirror image pipe S705 electric current Im increases
Stream mirror U701 output currents are equal to current source I701 sizes, and voltage at node Vm is equal to maximum battery voltage.It is in addition, electric at node
Pressure VP1 is high level, and VP2, VP3, VP4 are low level, can be selected most by the size for detecting voltage VP1, VP2, VP3, VP4
The battery of voltage maximum corresponding to the I701 of high current source.By Vm compared with threshold voltage Vref, when Vm reaches threshold value electricity
When pressing Vref, the maximum battery discharge of voltage.
Although embodiment is separately illustrated and illustrated above, it is related to the common technology in part, in ordinary skill
Personnel apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and the content recorded is not known, then
Refer to another embodiment on the books.
Embodiments described above, the restriction to the technical scheme protection domain is not formed.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements made within the spirit and principle of mode etc., should be included in the protection model of the technical scheme
Within enclosing.
Claims (14)
1. a kind of battery equalizing circuit, including：
Selection circuit, the battery voltage signal characterized per batteries both end voltage difference is received, and therefrom select the battery electricity of maximum
Press signal；
Battery discharging circuit, when the maximum battery voltage signal reaches threshold voltage, then to the maximum battery electricity
Press the battery discharge corresponding to signal.
2. battery equalizing circuit according to claim 1, it is characterised in that：Described selection circuit includes comparison circuit,
The comparison circuit includes one or more comparators, and the voltage in every batteries is compared by comparator, selected most
Big battery voltage.
3. battery equalizing circuit according to claim 2, it is characterised in that：Described selection circuit is by every two batteries
Voltage be compared, select larger voltage, all larger voltages selected be compared two-by-two again, by that analogy, until
Select maximum battery voltage.
4. battery equalizing circuit according to claim 2, it is characterised in that：Described selection circuit only needs a comparison
Device, the comparator both ends receive battery voltage signal, constantly switch the battery voltage signal of comparator both ends input, until choosing
Go out maximum battery voltage.
5. battery equalizing circuit according to claim 1, it is characterised in that：The selection circuit includes differential amplifier circuit
And output circuit, the differential amplifier circuit connect to form negative feedback structure with output circuit, described differential amplifier circuit one end
Battery voltage signal is inputted, the other end inputs the voltage signal after output circuit feedback regulation, the electricity after the feedback regulation
Pressure signal is maximum battery voltage signal.
6. battery equalizing circuit according to claim 5, it is characterised in that：The differential amplifier circuit includes multiple inputs
Pipe and current mirror, the input pipe input battery voltage signal, and the current mirror outputs connect the multiple input pipe.
7. battery equalizing circuit according to claim 6, it is characterised in that：The output circuit include multiple efferent ducts and
Current source, all efferent ducts are in parallel, the terminating load of parallel connected end one, and the load can be resistance or current source, described
Parallel connected end and the voltage of the current source common port are maximum battery voltage.
8. battery equalizing circuit according to claim 6, it is characterised in that：Input the input pipe and electricity of maximum battery voltage
The voltage for flowing Jing Gonggonglianjieduanchu is low level, is inputted at the input pipe and current mirror public connecting end of non-maximum battery voltage
Voltage be high level, the voltage swing by judging input pipe and current mirror public connecting end can select the maximum electricity of voltage
Pond.
9. battery equalizing circuit according to claim 1, it is characterised in that：The selection circuit includes mirror image circuit and defeated
Go out the current source that circuit and cell voltage change into, the mirror image circuit, output circuit connect to form negative-feedback knot with current source
Structure.
10. battery equalizing circuit according to claim 9, it is characterised in that：The mirror image circuit includes the first mirror image pipe
With multiple second mirror image pipes, all mirror image circuits share the first mirror image pipe, and the current source characterizes corresponding cell voltage；Through anti-
After feedback regulation, the electric current for flowing through the first mirror image pipe is maximum input current, and the maximum input current characterizes largest battery
Voltage.
11. battery equalizing circuit according to claim 9, it is characterised in that：The current source and the mirror image circuit are defeated
Going out end to be connected, the current source and the voltage at mirror image circuit public connecting end of the maximum battery voltage conversion are high level, its
His current source be low level with the voltage at mirror image circuit common port, by judging at each current source and mirror image circuit common port
Voltage swing can select the maximum battery of voltage.
12. battery equalizing circuit according to claim 1, it is characterised in that：The battery discharging circuit includes multiple electricity
Tank discharge module, the corresponding battery discharge module of each battery.
13. battery equalizing circuit according to claim 12, it is characterised in that：The battery discharge module include switch and
Resistance or switch and current source, the resistance or current source are used for battery discharge；The maximum battery voltage reaches threshold value electricity
During pressure, the switch closure in the battery discharge module corresponding to maximum battery voltage, the electricity corresponding to the maximum battery voltage
Tank discharge.
14. a kind of battery balanced control method, including：
Sampling therefrom selects the voltage signal of maximum per batteries both end voltage；Reach threshold in the maximum voltage signal
During threshold voltage, then to the battery discharge corresponding to the maximum voltage signal；Sampling side of the sampling per batteries both end voltage
Formula is that periodic samples or continuity sample.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710664381.7A CN107492924B (en) | 2017-08-04 | 2017-08-04 | Battery equalization circuit and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710664381.7A CN107492924B (en) | 2017-08-04 | 2017-08-04 | Battery equalization circuit and control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107492924A true CN107492924A (en) | 2017-12-19 |
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Citations (6)
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|---|---|---|---|---|
| JPH02294114A (en) * | 1989-05-08 | 1990-12-05 | Mitsubishi Electric Corp | Selection circuit for maximum value or minimum value |
| US6586917B1 (en) * | 2001-10-19 | 2003-07-01 | National Semiconductor Corporation | Battery charger shunt regulator with dual feedback control |
| CN101989847A (en) * | 2009-07-29 | 2011-03-23 | 联咏科技股份有限公司 | Numerical value judging device |
| CN102640382A (en) * | 2010-03-24 | 2012-08-15 | 株式会社杰士汤浅国际 | Secondary battery system |
| US20130328532A1 (en) * | 2012-06-06 | 2013-12-12 | Analog Vision Technology Inc. | Mult-channel constant voltage and constant current converting controler and apparatus |
| CN207117240U (en) * | 2017-08-04 | 2018-03-16 | 杰华特微电子（杭州）有限公司 | Battery equalizing circuit |
-
2017
- 2017-08-04 CN CN201710664381.7A patent/CN107492924B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02294114A (en) * | 1989-05-08 | 1990-12-05 | Mitsubishi Electric Corp | Selection circuit for maximum value or minimum value |
| US6586917B1 (en) * | 2001-10-19 | 2003-07-01 | National Semiconductor Corporation | Battery charger shunt regulator with dual feedback control |
| CN101989847A (en) * | 2009-07-29 | 2011-03-23 | 联咏科技股份有限公司 | Numerical value judging device |
| CN102640382A (en) * | 2010-03-24 | 2012-08-15 | 株式会社杰士汤浅国际 | Secondary battery system |
| US20130328532A1 (en) * | 2012-06-06 | 2013-12-12 | Analog Vision Technology Inc. | Mult-channel constant voltage and constant current converting controler and apparatus |
| CN207117240U (en) * | 2017-08-04 | 2018-03-16 | 杰华特微电子（杭州）有限公司 | Battery equalizing circuit |
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| CN107492924B (en) | 2023-06-23 |
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