CN206461054U - A kind of battery pack reduction voltage circuit - Google Patents
A kind of battery pack reduction voltage circuit Download PDFInfo
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- CN206461054U CN206461054U CN201621277583.3U CN201621277583U CN206461054U CN 206461054 U CN206461054 U CN 206461054U CN 201621277583 U CN201621277583 U CN 201621277583U CN 206461054 U CN206461054 U CN 206461054U
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- switch
- battery pack
- output capacitance
- circuit
- reduction voltage
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- 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
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The utility model discloses a kind of battery pack reduction voltage circuit, and the circuit includes：The first end of each positive switch is connected with the positive pole of a cell, and the second end is connected with one end of output capacitance and a control end of control centre respectively；The first end of each negative switch is connected with the negative pole of a cell, and output capacitance two ends are connected with first voltage output end and second voltage output end respectively.The utility model is a kind of battery pack reduction voltage circuit, because the power consumption produced by positive switch, negative switch and control centre is very low, so not producing transition loss substantially, improves conversion efficiency.And with the increase of load current, the reduction voltage circuit conversion efficiency is higher, and compared to existing pressure drop circuit, energy loss is lower.The utility model provides a kind of battery pack reduction voltage circuit, reduces the voltage disturbance that change-over circuit is produced by output capacitance, improves the stability of the pressure drop circuit.
Description
Technical field
The utility model is related to battery pack pressure drop circuit field, more particularly to a kind of battery pack reduction voltage circuit.
Background technology
With widely using for the portable equipment such as automotive electronics and family's energy storage, the purposes of battery pack is more and more wider, uses
It is battery-powered to turn into a kind of trend.The power and voltage request needed due to electrical equipment and battery pack itself control circuit is not
Equally, so needing to set change-over circuit by the voltage conversion of battery pack into electrical equipment required voltage in circuit, such as：
Switch control relay etc..And switch is more, the electric current of conversion is bigger, and the loss of change-over circuit is bigger.
Mainly problem is lost to reduce by way of reducing voltage in current battery group power supply circuit caused by high current.Most
Common decompression mode has two kinds, and one kind is depressured using transistor linearity, and another be depressured with on-off circuit.Linear voltage decreasing
Conversion to produce voltage disturbance small, but conversion efficiency is than relatively low, and can further be reduced with the rise efficiency of input voltage,
In addition, with the increase of electric current, substantial amounts of heat can be produced；Although on-off circuit decompression conversion efficiency is higher than linear voltage decreasing, meeting
Switching harmonics are produced, the stability of electricity consumption device is influenceed, in addition, energy loss is all equally had in transfer process, and with
Electric current increases, and transition loss is further exacerbated by, and then influences vehicle-mounted or portable product design difficulty and development cost.
Because current reduction voltage circuit has transition loss, and transition loss can shorten whole battery pack use time.
In order to make up transition loss, to increase more batteries during deisgn product, and the loss of conversion is all converted to form of heat
Come, so that radiating treatment must be done to battery again, and then the design volume of product can be increased, increase product development sheet, while
The difficulty of design can be increased.In addition, existing common reduction voltage circuit is with the increase of load current, loss can further increase, electricity
Road design can be more complicated.
Utility model content
The purpose of this utility model is to overcome weak point of the prior art there is provided a kind of battery pack reduction voltage circuit,
Utility model can reduce transition loss, reduce the interference that change-over circuit is produced.
The purpose of this utility model is achieved through the following technical solutions：
The utility model provides a kind of battery pack reduction voltage circuit, including：Multiple cells connect composition in a series arrangement
Battery pack, several positive switch, several negative switch, output capacitance and control centre；
The first end of each positive switch is connected with the positive pole of a cell, the second end respectively with the output capacitance
The control end connection of one end and control centre；
The first end of each negative switch is connected with the negative pole of a cell, the second end respectively with the output capacitance
Another control end connection of the other end and control centre；
The output capacitance two ends are connected with first voltage output end and second voltage output end respectively.
As further preferred scheme, in addition to voltage detection unit, the test side of the voltage detection unit and institute
State the common point connection of the first end of output capacitance and the positive switch, the output end of the voltage detection unit and the control
The detection input connection at center processed.
As further preferred scheme, the voltage detection unit include first resistor, second resistance, sampling resistor,
First electric capacity and power supply；
The power supply is grounded through the first resistor, the second resistance；One end of the sampling resistor with it is described
Output capacitance is connected, and the other end is connected with the common point of the first resistor and the second resistance；
First electric capacity is connected in parallel with the second resistance；
The common point of the first resistor and the second resistance also connects with the detection input of the control centre
Connect.
As further preferred scheme, the output capacitance is made up of several monomer electric capacity with parallel way connection.
As further preferred scheme, the positive switch and the negative switch are relay.
As further preferred scheme, the positive switch and the negative switch are metal-oxide-semiconductor.
The utility model compared to prior art advantage and have the beneficial effect that：
1st, the utility model is a kind of battery pack reduction voltage circuit, by positive switch, negative switch and control centre are produced
Raw power consumption is very low, so not producing transition loss substantially, improves conversion efficiency.And with the increase of load current,
The reduction voltage circuit conversion efficiency is higher, and compared to existing pressure drop circuit, energy loss is lower.
2nd, the utility model provides a kind of battery pack reduction voltage circuit, and the voltage that change-over circuit is produced is reduced by output capacitance
Interference, improves the stability of the pressure drop circuit.
3rd, the utility model provides a kind of battery pack reduction voltage circuit and is provided with control centre, alternately can control all positive poles
Switch and negative switch break-make, so that each cell can have the uniform discharge and recharge time, it is to avoid cell mistake occur
The phenomenon put, reduces the difference between cell, improves the security of battery pack.
4th, the utility model provides a kind of battery pack reduction voltage circuit and is provided with output capacitance, and output capacitance is according to output electricity
The big I of stream multiple monomer electric capacity in parallel, so that the circuit is smaller than traditional pressure drop circuit conversion ripple, further reduces and turn
Change the interference of circuit generation.
5th, a kind of battery pack reduction voltage circuit is additionally provided with voltage detection unit, can be to the electricity after each cell or packet
Pond carries out voltage detecting, is determined according to the voltage of detection during work, the length of positive switch and negative switch closing time.
6th, the circuit design advantages of simple of battery pack reduction voltage circuit of the present utility model, can improve the stabilization of reduction voltage circuit
Property and security.
Brief description of the drawings
Fig. 1 is the theory diagram of the battery pack pressure drop circuit of the utility model embodiment；
Fig. 2 is the circuit diagram of the battery pack reduction voltage circuit of the utility model embodiment.
Embodiment
For the ease of understanding the utility model, the utility model is more fully retouched below with reference to relevant drawings
State.Better embodiment of the present utility model is given in accompanying drawing.But, the utility model can come in many different forms
Realize, however it is not limited to embodiments described herein.On the contrary, the purpose for providing these embodiments is to make to this practicality newly
It is more thorough comprehensive that the disclosure of type understands.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or can also have element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " level ", " left side ",
For illustrative purposes only, it is unique embodiment to be not offered as " right side " and similar statement.
Unless otherwise defined, all of technologies and scientific terms used here by the article is led with belonging to technology of the present utility model
The implication that the technical staff in domain is generally understood that is identical.It is herein to be in term used in the description of the present utility model
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term as used herein " and/or " bag
Include the arbitrary and all combination of one or more related Listed Items.
Embodiment
Referring to Fig. 1, the utility model provides a kind of battery pack reduction voltage circuit, including：Multiple cells are with the side of series connection
Battery pack, several positive switch, several negative switch, output capacitance Cn and the control centre 100 of formula connection composition.
Cell BT provides power supply for load circuit, and positive switch is used to control cell BT positive pole to export, born
Pole is switched for controlling the negative pole of cell to export, and output capacitance Cn is used for the ripple for filtering out switch switching moment.In control
The heart 100 is used for closure or the disconnection for controlling positive switch and negative switch.The control centre is MCU.The MCU receives output
The output voltage Vout at electric capacity two ends, and control each positive switch and each negative pole to open according to output voltage Vout
The switch motion of pass, so that battery pack regulated output voltage.The positive switch and negative switch are relay or metal-oxide-semiconductor.Institute
Output capacitance is stated to be composed in parallel by several monomer electric capacity.
The first end of each positive switch is connected with the positive pole of a cell, the second end respectively with the output capacitance Cn
One end and control centre a control end connection.The first end of each negative switch is connected with the negative pole of a cell, the
Two ends are connected with the other end of the output capacitance Cn and another control end of control centre respectively.The output capacitance Cn two ends
It is connected respectively with first voltage output end and second voltage output end.
In Fig. 1, battery pack include multiple cells, respectively BT1, BT2, BT3 ..., BTn.Several positive poles are opened
Close, respectively S1+, S2+, S3+ ..., Sn+.Several positive switch, respectively S1-, S2-, S3- ..., Sn-.It is described each
Cell is corresponded with positive switch and negative switch, i.e. the first cell BT1 positive pole and the first positive switch S1+
Connection, negative pole is connected with the first negative switch S1-, and second comonomer battery BT2 positive pole is connected with the second positive switch S2+, is born
Pole is connected with the second negative switch S2-, and Third monomer battery BT3 positive pole is connected with the 3rd positive switch S3+, negative pole and the 3rd
Negative switch S3- connections, by that analogy the positive pole to the n-th cell BTn be connected with the n-th positive switch Sn+, negative pole and n-th
Negative switch Sn- connections.Meanwhile, the first cell BT1 negative pole and second comonomer battery BT2 positive pole are connected in series, the
Two cell BT2 negative pole and Third monomer battery BT3 positive pole are connected in series, by that analogy.
Also referring to Fig. 1 and Fig. 2, the battery pack reduction voltage circuit also includes voltage detection unit 200, the voltage inspection
The test side for surveying unit is connected with the output capacitance Cn and the first end of the positive switch common point, the voltage detecting
The output end of unit is connected with the detection input of the control centre 100.
Specifically, the voltage detection unit includes first resistor R1, second resistance R2, sampling resistor Rs, the first electric capacity
C1 and power supply VCC.The power supply is grounded through the first resistor R1, the second resistance R2；The sampling resistor
Rs one end is connected with the output capacitance C, and the common point of the other end and the first resistor R1 and second resistance R2 connects
Connect.The first electric capacity C1 is connected in parallel with the second resistance R2.The first resistor R1 and second resistance R2
Detection input of the common point also with the control centre 100 be connected.
The capacitance of first electric capacity substantially takes 0.1U and 1U, because MCU is powered by VCC, so the ginseng inside MCU
Examine voltage lower than VCC.In order to avoid AI sampled voltages exceed sample range, we take VCC/2, i.e. first resistor R1, second
Resistance R2 carries out partial pressure.Rs is sampling isolation resistance, it is to avoid high current damages MCU samplings.
The voltage detection unit is used to carry out voltage detecting, root to the cell group after each cell or packet
The closing time length switched during work is determined according to the voltage of the cell group after cell or packet.For example：If working as
The voltage of cell group after the cell of preceding electric discharge or packet is higher than cell group after all cells or packet
Average voltage when, its correspondence switch-closed time be H1Minute, H1More than H, preferably H1=H+0.1min；If present discharge
Cell or packet after the voltage of cell group be averaged less than cell group after all cells or packet
During voltage, its correspondence switch-closed time is H2Minute, H2Less than H, preferably H2=H-0.1min.
The course of work：
The control centre 100 determines that the output capacitance two ends need the size of target voltage；Further according to needing target
The size of voltage, the switch motion of each positive switch of control and each negative switch, to export stable target
Voltage.
Further, control centre 100 calculates the joint number of power supply cell every time according to target voltage.For example：Monomer
The voltage of battery is Un, and target voltage is V, and the joint number that can obtain power supply cell every time is N=Un/V.It is described to be used as power supply
Cell number be no more than cell sum.
The control centre 100 determines switch combination, switches set described in closure one according to the joint number of power supply cell
Close；The switch combination includes negative switch described in positive switch and one described in one.Calculated in step and obtain power supply monomer electricity
The joint number N in pond, then when can determine that each cell is powered, the switch combination that control centre 100 closes, i.e. control centre
The positive switch and negative switch of 100 closures.Specifically：Each switch combination is determined since lowest section cell, is closed
Stacked switch where lowest section cell.
The control centre 100 determines the size of load current, and calculates power-on time according to the size of the load current.
The power-on time H=V/C, wherein C are load current, and V is target voltage.It will be clear that load current is bigger, lead to
The electric time is shorter；Load current is smaller, and conduction time is longer.Here the size for calculating output capacitance Cn, the output are also included
Electric capacity Cn=A*C*V, wherein A are power conversion coefficient corresponding with filter circuit.Output capacitance Cn size is supplied with reality
Electrical power is relevant, for solving the ripple of switch switching moment；Multiple monomer electric capacity in parallel can reduce conversion interference, filter out out
Concern changes the ripple of generation, improves the stability of circuit.
After power-on time, current switch combination, the next switch combination of the control closure of control centre 100 are disconnected.
It will be clear that in general, since being combined first switch, each switch combination is closed successively.Opened when from first
Close combination to be closed to after last switch combination, first switch combination is closed again, disconnection is other to open combination, follows again
The ring process, realization is alternately closed each switch combination, exports target voltage.
Control centre 100 controls positive switch and negative switch closure or the detailed process disconnected：For example：If power supply is single
During the joint number N=1 of body battery, then illustrate only one of which cell as power supply, each switch that may thereby determine that
Combination is specially：First group of switch, which is closed, includes the first positive switch and the first negative switch；Second switch combination is including second just
Pole is switched and the second negative switch；…；N-th switch combination includes the n-th positive switch and the n-th negative switch.So now controlling
Center 100 by the switch combination where closing first segment cell, i.e., first group switch combination include the first positive switch and
First negative switch, control centre 100 controls other switch combinations to disconnect.After power-on time, first switch group is disconnected
Close, closure second switch combination, by that analogy, a to the last switch combination.Then start to close first switch again
Combination.
, can be true if during the joint number N=2 for cell of powering, illustrating to have two cells as power supply
Fixed each switch combination is specially：First switch combination includes the first positive switch and the second negative switch；Second switch group
Conjunction includes the 3rd positive switch and the 4th negative switch；…；Last switch combination is negative including the (n-1)th positive switch and n-th
Pole is switched.So the first switch combination that now control centre 100 closes includes the first positive switch and the second negative switch, control
Center 100 processed controls other switch combinations to disconnect.After power-on time, first switch combination is disconnected, second switch is closed
Combination, by that analogy, a to the last switch combination.Then closure first switch combination is started again.
Certainly it can also control to close the stacked switch where highest section cell here, that is, close the n-th switch combination,
Other switch combinations are disconnected, each switch combination is closed successively since the cell of highest section.
Control centre 100 can be controlled the break-make of corresponding switch combination according to the joint number of power supply cell, enter
And battery pack can be controlled to be depressured.The controlling switch combination circulation closure of control centre 100, can avoid cell or divide
Cell group continuous discharge after group, it is to avoid cell occur and cross the phenomenon put, reduce the difference between cell, carry
The safety and stability of high battery pack.
Output capacitance Cn in circuit can be according to the big I of output current multiple monomer electric capacity in parallel, so that the electricity
Road is smaller than traditional pressure drop circuit conversion ripple, reduces conversion interference, improves the stability of the pressure drop circuit.
Because the power consumption produced by positive switch, negative switch and control centre is very low, so not producing conversion substantially
Loss, improves conversion efficiency.And with the increase of load current, the reduction voltage circuit conversion efficiency is higher, compared to existing
Pressure drop circuit, energy loss is lower.
Embodiment described above only expresses several embodiments of the present utility model, and it describes more specific and detailed
Carefully, but can not therefore and be interpreted as the limitation to the utility model the scope of the claims.It should be pointed out that for the general of this area
For logical technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these are all
Belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (6)
1. a kind of battery pack reduction voltage circuit, it is characterised in that including：Multiple cells connect the battery of composition in a series arrangement
Group, several positive switch, several negative switch, output capacitance and control centre (100)；
The first end of each positive switch is connected with the positive pole of a cell, the one end of the second end respectively with the output capacitance
Connected with a control end of control centre (100)；
The first end of each negative switch is connected with the negative pole of a cell, and the second end is another with the output capacitance respectively
Another control end of end and control centre (100) is connected；
The output capacitance two ends are connected with first voltage output end and second voltage output end respectively.
2. battery pack reduction voltage circuit according to claim 1, it is characterised in that described also including voltage detection unit (200)
The test side of voltage detection unit (200) is connected with the common point of the output capacitance and the first end of the positive switch, institute
The output end for stating voltage detection unit (200) is connected with the detection input of the control centre (100).
3. battery pack reduction voltage circuit according to claim 2, it is characterised in that the voltage detection unit includes the first electricity
Resistance, second resistance, sampling resistor, the first electric capacity and power supply；
The power supply is grounded through the first resistor, the second resistance；One end of the sampling resistor and the output
Capacitance connection, the other end is connected with the common point of the first resistor and the second resistance；
First electric capacity is connected in parallel with the second resistance；
Detection input of the common point of the first resistor and the second resistance also with the control centre (100) is connected.
4. battery pack reduction voltage circuit according to claim 1, it is characterised in that the output capacitance is by several monomer electric capacity
Connected and constituted with parallel way.
5. battery pack reduction voltage circuit according to claim 1, it is characterised in that the positive switch and the negative switch are
Relay.
6. battery pack reduction voltage circuit according to claim 1, it is characterised in that the positive switch and the negative switch are
Metal-oxide-semiconductor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621277583.3U CN206461054U (en) | 2016-11-25 | 2016-11-25 | A kind of battery pack reduction voltage circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621277583.3U CN206461054U (en) | 2016-11-25 | 2016-11-25 | A kind of battery pack reduction voltage circuit |
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| CN206461054U true CN206461054U (en) | 2017-09-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106848444A (en) * | 2016-11-25 | 2017-06-13 | 惠州市蓝微新源技术有限公司 | A kind of battery pack voltage reduction method and reduction voltage circuit |
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2016
- 2016-11-25 CN CN201621277583.3U patent/CN206461054U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106848444A (en) * | 2016-11-25 | 2017-06-13 | 惠州市蓝微新源技术有限公司 | A kind of battery pack voltage reduction method and reduction voltage circuit |
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