CN109768590A - A kind of low-power consumption is from balancing battery voltage sampling circuit - Google Patents
A kind of low-power consumption is from balancing battery voltage sampling circuit Download PDFInfo
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Abstract
The present invention discloses a kind of low-power consumption from balancing battery voltage sampling circuit, and battery pack includes 2 or more concatenated battery units；Battery voltage sampling circuit includes the detection branch for respectively corresponding each battery unit, and one end of each detection branch connects the positive terminal of respective battery unit, and the other end is grounded, and is in series at least two divider resistance in detection branch；The tie point of 2 divider resistances is voltage sampling port；Between the adjacent detection branch of corresponding adjacent cell, it is also connected with from balanced route, is serially connected with from equilibrium line road from equalizing resistance and is equipped with controllable the first controllable switch from balanced circuit on-off；Respectively the both ends of equilibrium route respectively with the positive and negative end of one of battery unit and connect；The second controllable switch of controllable detection branch on-off is further respectively had in each detection branch.The present invention can the balanced electric current for flowing through each series-connected cell unit of tested battery pack in the detection process, ensure the service life of battery pack, while reducing detection circuit power consumption.
Description
Technical field
The present invention relates to battery detecting administrative skill field, especially a kind of low-power consumption that can be used for battery management system is certainly
Balancing battery voltage sampling circuit.
Background technique
In traditional battery management system, series-connected cell high-voltage signal is acquired by the way of electric resistance partial pressure, this
Sample can reduce requirement of the postscript ADC to dynamic range.It is the concatenated voltage of 4 (n) batteries as shown in Figure of description Fig. 1
Acquisition Circuit, during voltage acquisition, the total current for flowing through Cell-1 is Ic1=I1+I2+I3+I4(…+In), it flows through
The total current of Cell-2 is Ic2=I2+I3+I4(…+In), and so on go down it is found that flowing through the electric current of highest Cell-4 (n)
Electric current difference for I4 (n), each battery is larger, therefore easily leads to the unbalanced of battery, reduces the service life of battery pack, and
And battery pack series unit is more, situation is more serious.
Meanwhile regardless of whether during the test, detection circuit is constantly on state, and electric quantity consumption is big, loss is fast.
Summary of the invention
The object of the present invention is to provide a kind of electric resistance partial pressure type battery voltage sampling circuits, balanced in the detection process can flow
The electric current for crossing tested each series-connected cell unit of battery pack, ensures the service life of battery pack, while reducing detection circuit power consumption.
The technical scheme adopted by the invention is as follows: a kind of battery voltage sampling circuit, battery pack include 2 or more concatenated electricity
Pool unit；Battery voltage sampling circuit includes the detection branch for respectively corresponding each battery unit, and one end of each detection branch connects
The positive terminal of respective battery unit is connect, the other end is grounded, and is in series at least two divider resistance in detection branch；2 partial pressures
The tie point of resistance is voltage sampling port；
Between the adjacent detection branch of corresponding adjacent cell, it is also connected with from balanced route, is gone here and there from equilibrium line road
It is connected to from equalizing resistance and is equipped with controllable the first controllable switch from balanced circuit on-off；The respectively both ends difference of equilibrium route
With the positive and negative end of one of battery unit and connect；
The second controllable switch of controllable detection branch on-off is further respectively had in each detection branch.
The resistance value of respective equalizing resistance is designed, so that flowing through the electricity for being equal to from the electric current of equalizing resistance and flowing through divider resistance
Stream, then can make the electric current for flowing through each battery unit identical, to minimize the electric current extracted from each battery unit up to 0, i.e.,
The unbalanced of each battery unit in battery pack is avoided, has ensured battery life.In application sample circuit of the present invention, by outer
Portion's control changes the switch state of the first controllable switch and the second controllable switch, that is, each detection branch can be switched and from equilibrium line
The on off operating mode on road reduces the total power consumption of sample circuit to avoid kwh loss when not needing detection.
Preferably, define in battery pack by ground terminal, battery unit Cell-1, Cell-2 ..., Cell-n successively goes here and there
Connection, detection branch one end of corresponding battery unit Cell-i are connected to the positive terminal and Cell- (i+1) of battery unit Cell-i
Between negative pole end, other end ground connection；2 divider resistances are in series in each detection branch；
In addition to battery unit Cell-1, all respectively and one is connected to from equilibrium line on the positive and negative end of other battery units
Road.
As an implementation, first controllable switch and the second controllable switch are respectively relay contact, and first
Controllable switch is serially connected with from equilibrium line road, and the second controllable switch and divider resistance are serially connected in detection branch.Each first is controllable
Switch and the second controllable switch can be realized controllable according to detection needs in such a way that the microcontrollers such as single-chip microcontroller control relay
The closing or opening state of switch switches, so that conducting is accordingly from balanced route or detection branch.
Further, it is connected between two detection branch of definition corresponding adjacent cell Cell-i and Cell- (i+1)
It is RB from equalizing resistancei+1, the electric current flowed through thereon is Ibi+1；The divider resistance of the detection branch of corresponding battery unit Cell-i
On the electric current that flows through be Iai；Battery unit Cell-1, Cell-2 ..., the equal initial voltage on Cell-n be Vcell；Then
RBi+1Resistance value selection are as follows:
Consider that the electric current extracted from each battery unit is 0, then Ib2=Ia1, Ibi=Ibi-1+Iai-1, i >=3, therefore RBi+1
Resistance value are as follows:
About the value of Vcell, it is presently believed that the initial voltage of all battery units is the same when factory, i.e.,
Vcell when design is from equalizing resistance, presets selection sampling end voltage VAiFor the optimum linear input voltage of ADC chip, then examine
Consider route power consumption and interference free performance, presets the electric current Ia that divider resistance is crossed at each detection branch upstreami, can be according to the road of detection
The intrinsic standoff ratio coefficient of upper divider resistance, Extrapolation obtain the value of initial Vcell.
Preferably, in each detection branch, the detection electric current Ia of divider resistance is flowed throughiIt is equal, then the resistance of respective equalizing resistance
Value selection are as follows:
RBi+1=Vcell/ (i*Ia1),i≥1。
Certainly, Ia1,Ia2,...,IanAlso it can choose different, but thus need divider resistance RA1,RA2,...,
RANDifferent, resistance type is more, gets ready the goods cumbersome, and can have the performance differences such as temperature drift.
Preferably, for there is 4 battery cells in series, and each battery unit nominal voltage is the battery pack of 3.6V, each to examine
Survey the divider resistance of branch road and the resistance value from equalizing resistance are as follows: RA1=RA2=RA3=RA4=25K Ω, R1=11K Ω,
RB2=36K Ω, R2=47K Ω, RB3=18K Ω, R3=83K Ω, RB4=12K Ω, R4=119K Ω.Under this embodiment,
When design is from equalizing resistance, selection sampling end voltage VA is presetiThe electric current phase flowed through for 2.5V, each detection branch divider resistance
Deng for 100 μ A.
As another embodiment, first controllable switch is that drain electrode is serially connected in source electrode from equilibrium line road
PMOS switch pipe connects and is additionally provided with time concatenated with divider resistance high-pressure side in the respectively on high-tension side each detection branch of balanced route
Road resistance, the grid of the first controllable switch of respective equilibrium line road are connected to this from balanced route high-pressure side and even detect branch
Between the loop resistance and divider resistance on road；
Second controllable switch is NMOS switch pipe, and the drain electrode of each second controllable switch and source electrode are serially connected in two partial pressures electricity
Detection line road between resistance, grid connect the control output end of peripheral control unit.
The peripheral control unit can be the microcontrollers such as single-chip microcontroller, utilize 3V the or 5V output voltage of one-chip machine port
The conducting of each NMOS switch pipe is directly driven, to realize the control of the second controllable switch.
When the second controllable switch is connected, then corresponding detection branch conducting, first be connected in detection branch controllably open
The grid of pass is high level, then the first controlled tr tube is connected, and then respectively balanced line conduction, both realizes sample circuit
From equilibrium, while when controlling sample circuit, it is only necessary to which the control to two controllable switches can be realized in a pin of controller
System, can simplified control route, reduce the output pin resource distribution of controller, and other device extensions.
Further, on the positive and negative end of battery unit Cell-1 and a balanced route, the equilibrium route are connected to
On be serially connected with the third controllable switch of equalizing resistance and controllable balanced circuit on-off.The equilibrium route can be used for other factors shadow
It rings, such as the capacity individual difference generated in battery use process and the battery difference of self discharge generation, causes the both ends Cell-1 electric
When pressure increases, equalizing resistance is connected by individually controlling third controllable switch, with balanced Cell-1 both end voltage.
The resistance value of equalizing resistance can according to the voltage change range of single battery unit and required euqalizing current into
Row setting.
Preferably, the third controllable switch is the relay contact or PMOS switch pipe for concatenating equalizing resistance；Third can
When control switching tube is PMOS switch pipe, source electrode and drain electrode is serially connected with equilibrium line road, and grid connects the control of peripheral control unit
Output end.
Beneficial effect
The present invention between adjacent detection branch by being arranged from equalizing resistance, so that the tie point of two adjacent cells
The electric current flowed out to detection branch is close to 0, so that the electric current flowed through on each battery unit is equal as far as possible, that is, avoids and adopts
Each battery unit of battery pack is unbalanced during sample, can ensure battery life；
By the way that controllable switch is being arranged from balanced route and detection branch, so that the on-off of detection branch is controllable, thus
Can when not needing detection breaking circuit to reduce the energy consumption of detection circuit；
By setting PMOS and NMOS tube for controllable switch, control detects the on-off to show the way, and then by detection branch
The on-off of the certainly balanced branch of on-off variation control, the configuration requirement to control chip pin resource of reduction are not necessarily to other extensions.
Detailed description of the invention
Fig. 1 show conventional batteries voltage collection circuit schematic illustration；
Fig. 2 show the battery voltage acquisition circuit schematic illustration of an embodiment of the present invention；
Fig. 3 show the battery voltage acquisition circuit schematic illustration of another embodiment of the invention.
Specific embodiment
It is further described below in conjunction with the drawings and specific embodiments.
Shown in referring to figs. 2 and 3, battery pack that is tested or being managed includes 2 or more concatenated battery units；The present invention
From balancing battery voltage sampling circuit, the detection branch including respectively corresponding each battery unit, one end of each detection branch
The positive terminal of respective battery unit is connected, the other end is grounded, and is in series at least two divider resistance in detection branch；Described 2 points
The tie point of piezoresistance is voltage sampling port；
Between the adjacent detection branch of corresponding adjacent cell, it is also connected with from balanced route, is gone here and there from equilibrium line road
It is connected to from equalizing resistance and is equipped with controllable the first controllable switch from balanced circuit on-off；The respectively both ends difference of equilibrium route
With the positive and negative end of one of battery unit and connect；
The second controllable switch of controllable detection branch on-off is further respectively had in each detection branch.
The resistance value of respective equalizing resistance is designed, so that flowing through the electricity for being equal to from the electric current of equalizing resistance and flowing through divider resistance
Stream, then can make the electric current for flowing through each battery unit identical, to minimize the electric current extracted from each battery unit up to 0, i.e.,
The unbalanced of each battery unit in battery pack is avoided, has ensured battery life.In application sample circuit of the present invention, by changing
Become the switch state of the first controllable switch and the second controllable switch, that is, the on-off of each detection branch can be switched and from balanced route
On off operating mode, thus do not need detection when avoid kwh loss, reduce the total power consumption of sample circuit.
Embodiment 1
Referring to figs. 2 and 3, in the present embodiment, 2 divider resistances R and RA are in series in each detection branch.
Define in battery pack by ground terminal, battery unit Cell-1, Cell-2 ..., Cell-n be sequentially connected in series, it is corresponding
Detection branch one end of battery unit Cell-i is connected to the positive terminal of battery unit Cell-i and the negative pole end of Cell- (i+1)
Between, other end ground connection；
In addition to battery unit Cell-1, all respectively and one is connected to from equilibrium line on the positive and negative end of other battery units
Road.
On the positive and negative end of battery unit Cell-1 and it is connected to a balanced route, the equilibrium line road is serially connected with equilibrium
Resistance RB1With the third controllable switch of controllable balanced circuit on-off.The equilibrium route can be used for other factors influence, such as battery
The battery difference that the capacity individual difference generated in use process and self discharge generate, when Cell-1 both end voltage being caused to increase,
Equalizing resistance is connected by individually controlling third controllable switch, with balanced Cell-1 both end voltage.
The resistance value of equalizing resistance can according to the voltage change range of single battery unit and required euqalizing current into
Row setting.
Embodiment 1-1
Based on embodiment 1, with reference to Fig. 2, in the present embodiment, the first controllable switch, the second controllable switch and third are controllably opened
Closing is respectively relay contact, and the first controllable switch is serially connected with from equilibrium line road, and the second controllable switch is concatenated with divider resistance
In in detection branch.Each first controllable switch and the second controllable switch can pass through the microcontrollers such as single-chip microcontroller according to detection needs
The mode of control relay realizes the closing or opening state switching of controllable switch, so that conducting is accordingly from balanced route or inspection
Survey branch.
The resistance value design principle of respective equalizing resistance are as follows: do not consider that the setting of the both ends Cell-1 equilibrium route, definition correspond to
Connected between two detection branch of adjacent cell Cell-i and Cell- (i+1) from equalizing resistance be RBi+1, flow through thereon
Electric current be Ibi+1；The electric current flowed through on the divider resistance of the detection branch of corresponding battery unit Cell-i is Iai；Battery unit
Cell-1, Cell-2 ..., the equal voltage on Cell-n be Vcell；Then RBi+1Resistance value selection are as follows:
Consider that the electric current extracted from each battery unit is 0, then Ib2=Ia1, Ibi=Ibi-1+Iai-1, i >=3, therefore RBi+1
Resistance value are as follows:
Design principle of the invention are as follows: each battery unit is flowed through during aligned sample by being arranged from equalizing resistance
Electric current flows through the total of Cell-1 for the battery pack of n (n > 4) a battery cells in series with reference to traditional sampling circuit diagram in Fig. 1
Electric current is Ic1=I1+I2+I3+I4,...,+In, the total current for flowing through Cell-2 is Ic2=I2+I3+I4,...,+In, and so on
Go down it is found that the electric current for flowing through highest Cell-n is In；
With reference to Fig. 2, the present invention passes through the value being back-calculated to obtain from equalizing resistance: it is arranged from after equalizing resistance, in order to enable
Ic1,Ic2,...,IcnIt is equal, then it is required that I1,I2,...,In-1Respectively equal to 0, guarantee not extract electric current from battery unit,
Then for any RBi+1(i >=1), the electric current Ib flowed through thereoni+1, and divided in the detection branch of corresponding battery supply Cell-i
The electric current Ia that resistance flows throughiBetween relationship are as follows:
It is assumed that the voltage at each battery unit both ends is Vcell, then the resistance value RB of respective equalizing resistance can be obtainedi+1
Are as follows:
Namely:
Have with reference to Fig. 2 for any detection branch:
I*Vcell=Iai*(Ri+RAi)
Therefore, pass through Vcell and Iai, can be obtained the resistance value of divider resistance in each detection branch, and from equalizing resistance
Resistance value.
About the value of Vcell, it is presently believed that the initial voltage of all battery units is the same when factory, i.e.,
Vcell when design is from equalizing resistance, presets selection sampling end voltage VAiFor the optimum linear input voltage of ADC chip, preferably
For 2.5V；It considers further that route power consumption and interference free performance, presets the electric current Ia that divider resistance is crossed at each detection branch upstreami, preferably
For 100 μ A；The value of initial Vcell can be obtained according to the intrinsic standoff ratio coefficient of the road divider resistance of detection, Extrapolation.
In order to simplify route, resistance type is reduced, stock complexity is reduced, avoids the performance differences such as temperature drift, this reality as far as possible
It applies example to design in each detection branch, flows through the electric current Ia of divider resistanceiIt is equal, then the resistance value selection of respective equalizing resistance are as follows:
RBi+1=Vcell/ (i*Ia1),i≥1。
Referring again to FIGS. 2, for there is 4 battery cells in series, and each battery unit nominal voltage is the battery pack of 3.6V,
When design is from equalizing resistance, selection sampling end voltage VA is presetiThe electric current phase flowed through for 2.5V, each detection branch divider resistance
Deng for 100 μ A, then the divider resistance in each detection branch and the resistance value from equalizing resistance are as follows:
RA1=RA2=...=RAn=VAi/Iai=2.5V/100uA=25K Ω
R1=(Vcell-VA1)/Ia1=(3.6V-2.5V)/100uA=11K Ω
RB2=Vcell/Ia1=3.6V/100uA=36K Ω
R2=(2*Vcell-VA2)/Ia2=(2*3.6V-2.5V)/100uA=47K Ω
RB3=Vcell/ (2*Ia1)=18K Ω
It similarly can be calculated: R3=83K Ω, RB4=12K Ω, R4=119K Ω.
It should be noted that target I of the invention1,I2,...,In-1=0 is ideal situation, due to each electricity in actual circuit
The voltage Vcell of pool unit is there are deviation, therefore I1,I2,...,In-1It may not absolutely be zero, but the present invention is designed from system
Angle allow electric current approach to be zero, can still achieve the purpose that in detection process that each battery unit is balanced as far as possible to greatest extent.
The present embodiment application when: when not needing battery voltage detection, first controllable switch SWB1, SWB2, SWB3,
SWB4 and second controllable switch SW1, SW2, SW3, SW4 are all disconnected, and detection circuit no current passes through, and does not consume power consumption；
SW4 is closed when detecting most significant end battery Cell-4 voltage, and other switches disconnect, other batteries from equalizing resistance
Upper no electric current passes through, and the operating current of all batteries is consistent, under the conditions of guaranteeing that battery current is consistent, reduces detection power consumption；
When detection removes other battery cell voltages of most significant end battery Cell-4, the equalizer switch of least significant end battery Cell-1
SWB1 is disconnected, other to close the switch, and guarantees that the operating current of all batteries when detection circuit work is consistent；
When any one battery cell voltage is excessively high, corresponding balanced electricity can be connected by controlling corresponding controllable switch
Resistance is realized from equalizing resistance.
The present embodiment is equally applicable to the situation of n battery units in parallel.Since each battery unit Cell is parallel with
Equalizing resistance and control switch, so if occur that operating voltage is inconsistent, some cell voltage is excessively high in battery use process,
The equalizer switch closure that can be controlled separately associated batteries realizes equalization function.
Embodiment 1-2
Based on embodiment 1, in the present embodiment, the first controllable switch is that drain electrode is serially connected in source electrode from equilibrium line road
PMOS switch pipe connects and is additionally provided with time concatenated with divider resistance high-pressure side in the respectively on high-tension side each detection branch of balanced route
Road resistance, the grid of the first controllable switch of respective equilibrium line road are connected to this from balanced route high-pressure side and even detect branch
Between the loop resistance and divider resistance on road；
Second controllable switch is NMOS switch pipe, the drain electrode of each second controllable switch and source electrode be serially connected in two divider resistances it
Between detection line road, grid connect peripheral control unit control output end.
The peripheral control unit can be the microcontrollers such as single-chip microcontroller, utilize 3V the or 5V output voltage of one-chip machine port
The conducting of each NMOS switch pipe is directly driven, to realize the control of the second controllable switch.
When the second controllable switch is connected, then corresponding detection branch conducting, first be connected in detection branch controllably open
The grid of pass is high level, then the first controlled tr tube is connected, and then respectively balanced line conduction, both realizes sample circuit
From equilibrium, while when controlling sample circuit, it is only necessary to which the control to two controllable switches can be realized in a pin of controller
System, can simplified control route, reduce the output pin resource distribution of controller, and other device extensions.
Third controllable switch is that its source electrode and drain electrode of PMOS switch pipe is serially connected with equilibrium line road, the external control of grid connection
The control output end of device.It is not provided with loop resistance in the connection on high-tension side detection branch of Cell-1, third controlled tr tube is by outer
Portion's controller directly controls.Loop resistance resistance value in other detection branch can according to the cut-in voltage VSG of PMOS switch pipe with
And electric current is detected to determine, Rp=VSG/Ia is such as set, and voltage is VSG bias voltage when PMOS is opened on Rp resistance, with guarantor
Demonstrate,proving each first controlled tr tube being capable of the unlatching when detection circuit is connected.
As Fig. 2 realizes controllable low-power consumption in use, control CB1 is high level, C1, C2, C3, C4 while high level
From balancing battery voltage detecting；C1 control is low level, and the independently control of CB1, C2, C3, C4 can open corresponding battery
Independent Balance route.
The present embodiment may be equally applied to the battery pack of more battery cells in series.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of battery voltage sampling circuit, battery pack includes 2 or more concatenated battery units；It is characterized in that:
Battery voltage sampling circuit includes the detection branch for respectively corresponding each battery unit, and one end of each detection branch connects phase
The positive terminal of battery unit is answered, the other end is grounded, and is in series at least two divider resistance in detection branch；2 divider resistances
Tie point be voltage sampling port；
Between the adjacent detection branch of corresponding adjacent cell, it is also connected with from balanced route, is serially connected with from equilibrium line road
From equalizing resistance and it is equipped with controllable the first controllable switch from balanced circuit on-off；Respectively equilibrium route both ends respectively with its
In a battery unit positive and negative end and connect；
The second controllable switch of controllable detection branch on-off is further respectively had in each detection branch.
2. battery voltage sampling circuit according to claim 1, it is characterized in that: defining in battery pack by ground terminal,
Battery unit Cell-1, Cell-2 ..., Cell-n be sequentially connected in series, detection branch one end connection of corresponding battery unit Cell-i
Between the negative pole end of the positive terminal and Cell- (i+1) of battery unit Cell-i, other end ground connection；It connects in each detection branch
There are 2 divider resistances；
In addition to battery unit Cell-1, all respectively and one is connected to from balanced route on the positive and negative end of other battery units.
3. battery voltage sampling circuit according to claim 1 or 2, it is characterized in that: first controllable switch and second
Controllable switch is respectively relay contact；First controllable switch is serially connected with from equilibrium line road, the second controllable switch and partial pressure electricity
Resistance is serially connected in detection branch.
4. battery voltage sampling circuit according to claim 2, it is characterized in that: defining corresponding adjacent cell Cell-i
Connected between two detection branch of Cell- (i+1) from equalizing resistance be RBi+1, the electric current flowed through thereon is Ibi+1；It is corresponding
The electric current flowed through on the divider resistance of the detection branch of battery unit Cell-i is Iai；Battery unit Cell-1, Cell-2 ...,
Equal initial voltage on Cell-n is Vcell；Then RBi+1Resistance value selection are as follows:
Consider that the electric current extracted from each battery unit is 0, then Ib2=Ia1, Ibi=Ibi-1+Iai-1, i >=3, therefore RBi+1Resistance
Value are as follows:
5. battery voltage sampling circuit according to claim 4, it is characterized in that: flowing through divider resistance in each detection branch
Electric current IaiIt is equal, then the resistance value selection of respective equalizing resistance are as follows:
RBi+1=Vcell/ (i*Ia1),i≥1。
6. battery voltage sampling circuit according to claim 5, it is characterized in that: for there is 4 battery cells in series, and it is each
Battery unit nominal voltage is the battery pack of 3.6V, the divider resistance in each detection branch and the resistance value from equalizing resistance are as follows:
RA1=RA2=RA3=RA4=25K Ω, R1=11K Ω, RB2=36K Ω, R2=47K Ω, RB3=18K Ω, R3=83K Ω,
RB4=12K Ω, R4=119K Ω.
7. battery voltage sampling circuit according to claim 1 or 2, it is characterized in that: first controllable switch is drain electrode
It is serially connected in the PMOS switch pipe from equilibrium line road with source electrode, connects and is also set in the respectively on high-tension side each detection branch of balanced route
There is the loop resistance concatenated with divider resistance high-pressure side, the grid of the first controllable switch of respective equilibrium line road is connected to this
From between the loop resistance and divider resistance of balanced the connected detection branch in route high-pressure side；
Second controllable switch is NMOS switch pipe, the drain electrode of each second controllable switch and source electrode be serially connected in two divider resistances it
Between detection line road, grid connect peripheral control unit control output end.
8. battery voltage sampling circuit according to claim 1 or 2, it is characterized in that: the positive and negative anodes of battery unit Cell-1
On both ends and it is connected to a balanced route, the equilibrium line road is serially connected with the third of equalizing resistance and controllable balanced circuit on-off
Controllable switch.
9. battery voltage sampling circuit according to claim 8, it is characterized in that: the third controllable switch is that concatenation is balanced
The relay contact or PMOS switch pipe of resistance；When third controlled tr tube is PMOS switch pipe, source electrode and drain electrode is serially connected with
Equilibrium line road, grid connect the control output end of peripheral control unit.
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| CN110350632A (en) * | 2019-08-20 | 2019-10-18 | 深圳市道通智能航空技术有限公司 | A kind of battery balanced self discharge circuit and unmanned plane |
| CN111044931A (en) * | 2019-12-10 | 2020-04-21 | 浙江大学昆山创新中心 | Battery disconnection detection circuit and detection method |
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| CN209516650U (en) * | 2018-12-26 | 2019-10-18 | 苏州易美新思新能源科技有限公司 | A kind of low-power consumption is from balancing battery voltage sampling circuit |
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| CN110350632A (en) * | 2019-08-20 | 2019-10-18 | 深圳市道通智能航空技术有限公司 | A kind of battery balanced self discharge circuit and unmanned plane |
| CN111044931A (en) * | 2019-12-10 | 2020-04-21 | 浙江大学昆山创新中心 | Battery disconnection detection circuit and detection method |
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