CN101814773A - Voltage balancing device of super capacitor bank and control method thereof - Google Patents

Voltage balancing device of super capacitor bank and control method thereof Download PDF

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Publication number
CN101814773A
CN101814773A CN200910250248A CN200910250248A CN101814773A CN 101814773 A CN101814773 A CN 101814773A CN 200910250248 A CN200910250248 A CN 200910250248A CN 200910250248 A CN200910250248 A CN 200910250248A CN 101814773 A CN101814773 A CN 101814773A
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voltage
capacitor
converter
control unit
super capacitor
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许家群
宋小敬
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Beijing University of Technology
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Beijing University of Technology
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Abstract

The invention relates to a voltage balancing device, in particular to a device capable of balancing voltage among monomers of a series super capacitor bank and a control method thereof. The device comprises a series super capacitor bank, a switch array, a DC/DC converter, a balancing capacitor, a detection unit and a control unit, wherein the series super capacitor set, the switch array, the DC/DC converter and the balancing capacitor are connected in sequence; the input end of the detection unit is connected with the series super capacitor bank and the balancing capacitor, and the output end is connected with the control unit; the output end of the control unit is connected with the switch array and the DC/DC converter; a control signal output by the control unit controls the switch array and the DC/DC converter; and finally, energy transfer between the super capacitor bank and the balancing capacitor is realized. The invention only needs one DC/DC converter, and compared with a DC/DC converter method, power devices, such as inductance tubes, switching tubes and the like, are saved a lot, and thereby the system reliability is improved, and the energy consumption is reduced.

Description

Voltage balancing device of super capacitor bank and control method thereof
Technical field
The present invention relates to a kind of voltage balancing device, the device and the control method of voltage between each monomer of the balanced series super capacitor bank of especially a kind of energy.
Background technology
The rated voltage of super capacitor is lower, needs a large amount of series connection in application.Because the dispersiveness of characterisitic parameter between each ultracapacitor, bank of super capacitors normally discharge and recharge or inactive state under, voltage between the monomer can occur unbalanced, overcharges and crosses to put phenomenon and all can cause the permanent damages of ultracapacitor, and then cause the inefficacy of whole energy-storage system.
For the monomer voltage of balanced series super capacitor bank, generally adopt voltage balance circuit.Wherein, passive equalization is that the high super capacitor redundance energy consumption of voltage is fallen, promptly by resistive device consumed energy; Active equilibrium is the energy transfer technology of pressure equalization, promptly shifts energy by energy storage device, and energy consumption is little, and controllability is good.
In the active equalization methods, the flying capacitance method is to carry out parallel connection between the monomer capacitance group that the equalizing capacitor monomer capacitance group that voltage is the highest in the series capacitance group and series voltage is minimum to switch, finish electric charge by of the transfer of the highest monomer capacitance group of voltage to the minimum monomer capacitance group of voltage, thereby the voltage of the high monomer capacitance group of voltage is descended, the voltage of the monomer capacitance group that voltage is low rises, and reaches balanced purpose.This method for equalizing voltage can carry out electric voltage equalization fast, and all presses precision height, loss little, is all can carry out electric voltage equalization at charging and discharging state or in inactive state.But this method for equalizing voltage dynamic property is relatively poor, because it needs relay network to come balanced electric capacity of gating and high-voltage capacitance (low-voltage capacitance), when relay conducting moment, the system shock electric current is big, and equipment dependability is low.
DC/DC converter method in the active equalization methods is all to connect a DC/DC converter between per two adjacent ultracapacitors, by the voltage between the more adjacent super capacitor, the energy of the super capacitor that voltage is high is transferred in the low capacitor of voltage by converter and is gone.For the series capacitor bank of forming by N capacitor, need N-1 DC/DC converter.The advantage of this method is that energy loss is low, and electric voltage equalization speed is fast, all can carry out electric voltage equalization to charging and discharging state.But shortcoming is that the inductance, the switching tube constant power device that need are many, and control is complicated, the cost height.
Summary of the invention
The objective of the invention is to overcome the above-mentioned defective of existing super capacitor electric voltage equalization technology, a kind of new electric voltage equalization method-the converter method flies over for the serial connected super capacitance group provides.This method utilizes the voltage stabilizing of DC/DC converter, advantage that dynamic property is good to solve the big problem of system shock electric current in the flying capacitor method, can effectively control simultaneously the energy Flow between equalizing capacitor and the serial connected super capacitance group monomer, make that the energy consumption of voltage balance circuit is low, balancing speed is fast, impulse current is little, cost is low.
To achieve these goals, the present invention has taked following technical scheme.The present invention includes serial connected super capacitance group 1, switch arrays 2, DC/DC converter 3, equalizing capacitor 4, detecting unit 5 and control unit 6.Wherein:
Super capacitor group 1 is joined with detecting unit 5, detects voltage signal by detecting unit 5, current signal and temperature signal.Voltage signal is the voltage that detects on each monomer voltage of super capacitor and the equalizing capacitor; Current signal is the electric current that detects on the equalizing capacitor, and utilizes this current signal to judge the charging and discharging state of super capacitor group; Temperature signal is the temperature that detects the super capacitor group, because the state of super capacitor and parameter are subjected to it self temperature effect, therefore detected temperatures can help to estimate accurately the state of ultracapacitor in real time, controls thereby better carry out equilibrium.
Control unit 6 is connected with detecting unit 5, handles voltage, electric current, the temperature signal of detecting unit 5 inputs, the control signal of output relay switch arrays 2 and DC/DC converter 3;
Serial connected super capacitance group 1, switch arrays 2, DC/DC converter 3 and equalizing capacitor 4 are connected successively, the input of detecting unit 5 is connected with equalizing capacitor 4 with serial connected super capacitance group 1, output is connected with control unit 6, the output of control unit 6 is connected with DC/DC converter 3 with switch arrays 2, the control signal of control unit 6 outputs is come control switch array 2 and DC/DC converter 3, finally realizes the energy delivery between super capacitor group 1 and the equalizing capacitor 4.Wherein equalizing capacitor 4 is the capacitors that carry out energy delivery with super capacitor group 1, realize super capacitor group electric voltage equalization function.
The gating order of switch arrays and the control mode of DC/DC converter are implemented as follows:
(1) detector 5 detects the electric current of equalizing capacitor 4, and gives control unit 6 with this electric current transmission, and control unit 6 is judged the charging and discharging state of bank of super capacitors according to the size and Orientation of electric current on the detected equalizing capacitor.If the super capacitor group is in charged state, the control strategy when then choosing charged state; Otherwise, the control strategy when choosing discharge condition.
Control strategy during described charged state is as follows:
1) detecting unit 5 detects super capacitor group 1 each monomer voltage (voltage of single super capacitor in the super capacitor group) and equalizing capacitor 4 voltages;
2) control unit 6 is found out the super capacitor of voltage maximum in the super capacitor group, and its voltage is designated as Umax, and sends control signal for switch arrays 2, and the super capacitor of voltage maximum is connected with the DC/DC converter,
3) power switch of 6 pairs of DC/DC converters 3 of control unit sends control signal, makes DC/DC converter 3 be operated in pressure-increasning state;
4) as Δ U aWith Δ U bSatisfy Δ U b〉=k Δ U aThe time, k ∈ [0,1], control unit 6 sends signal to switch arrays 2, and the highest capacitor of new voltage is connected with the DC/DC converter;
Wherein: U FullRated voltage when being full of electricity for super capacitor, U NewBe the voltage of the electric capacity that the new voltage that produces is the highest in the charging process, U OldBe the capacitance voltage that links to each other with the DC/DC converter before; Δ U a=U Full-U New, Δ U b=U New-U Old, k is the arbitrary constant between [0,1].
Control strategy during described discharge condition is as follows:
1) detecting unit 5 detects super capacitor group 1 each monomer voltage and equalizing capacitor 4 voltage U f
2) control unit 6 is found out voltage maximum (U in the super capacitor group Max) and minimum ( Umin) super capacitor, and obtain their average voltage U Ave(average of maximum monomer of voltage and the minimum monomer of voltage in the super capacitor group), relatively U AveVoltage U with equalizing capacitor f
If U AveMore than or equal to equalizing capacitor voltage, then control unit 6 output control signals are joined the capacitor of switch arrays 2 gate voltage maximums and DC/DC converter 3, control unit 6 makes it be operated in the forward pressure-increasning state to DC/DC converter 3 input control signals, and equalizing capacitor 4 is charged to U Av, U AvIt is the average of equalizing capacitor voltage and the super capacitor group monomer voltage in parallel with equalizing capacitor;
If U AveLess than equalizing capacitor voltage, then control unit 6 output control signals are joined the capacitor of switch arrays 2 gate voltage minimums and DC/DC converter 3, control unit 6 makes it be operated in reverse pressure-increasning state to DC/DC converter 3 input control signals, and equalizing capacitor is filled 4 to U Av
3) repeating step 1), check whether serial connected super capacitance group 1 each monomer voltage satisfies accuracy of equalization control requirement, and the described accuracy of equalization comprises two indexs, i.e. voltage variance δ vWith the maximum voltage deviation delta vIf each monomer voltage satisfies voltage variance and the requirement of maximum voltage deviation simultaneously, then stops equilibrium.
Voltage variance δ vCalculate by following formula:
δ v = Σ i = 1 N ( v i - v avg ) 2 ≤ ϵ 1 , In the formula: v iBe in the super capacitor group monomer voltage value, v AvgBe the average voltage of each super capacitor of super capacitor group, N is the number of super capacitor in the super capacitor group, ε 1Be a positive set-point, span is generally [0,1], and it has determined the requirement to control precision.
The maximum voltage deviation delta vCalculate by following formula:
Δ v=max | v i-v j|≤ε 2, v i, v jBe respectively the magnitude of voltage of two different super capacitors in the super capacitor group, ε 2Also be a positive set-point, span is generally [0,0.25], and it has determined the permissible value of maximum voltage.
The present invention compared with prior art, advantage is:
1) the present invention adopts the DC/DC converter to solve the shortcoming that flying capacitor system shock electric current is big, equipment dependability is low, and has realized that the controlled energy between series capacitance group and the equalizing capacitor flows.
2) the present invention only needs a DC/DC converter, lacks a lot of inductance, switching tube constant power device than DC/DC converter method, makes that system reliability improves, energy consumption reduces.
Description of drawings
Fig. 1 is the electric voltage equalization system architecture diagram
Fig. 2 is the DC/DC converter method circuit diagram that flies over
Fig. 3 is the electric voltage equalization control flow chart
Among the figure: 1, serial connected super capacitance group, 2, switch arrays, 3, the DC/DC converter, 4, equalizing capacitor, 5, detecting unit, 6, control unit.
Embodiment
The invention will be further described below in conjunction with Fig. 1, Fig. 2, Fig. 3:
As shown in Figure 1, present embodiment comprises serial connected super capacitance group 1, switch arrays 2, DC/DC converter (dc dc converter) 3, equalizing capacitor 4, detecting unit 5 and control unit 6.Detect the voltage of each super capacitor group 1 monomer and equalizing capacitor 4 with detecting unit 5, by control unit 6, enable switch array 2, make serial connected super capacitance group 1 and DC/DC converter 3 and equalizing capacitor 4 gatings, thereby realize the energy Flow between serial connected super capacitance group 1 and the equalizing capacitor 4.
As shown in Figure 2, the super capacitor group of one group of series connection selects four monomer super capacitors 100,101,102 wherein with 103 to be described being connected of physical circuit.Voltage balance circuit is made up of switch arrays 211, DC/DC converter 311 and equalizing capacitor 400.Wherein switch arrays are made up of switch 200,201,202,203.
First exit 01 of switch 200 meets the anode a0 of super capacitor, second exit 02 be connected to adjacent two ultracapacitors 100 with 101 be connected mid point a1; First exit 11 of switch 201 is connected to second exit 02 of switch 200, second exit 12 be connected to adjacent two super capacitors 101 with 102 be connected mid point a2, three terminal 03, the four exit 14 that three terminal 13 is connected to switch 200 is connected to the 4th exit 04 of switch 200; The connection of back switch similarly.The function of switch arrays is that equalizing capacitor 400 is in parallel with two ultracapacitors of needs equilibrium respectively, thereby the electric charge of the high ultracapacitor of voltage is transferred on the low ultracapacitor of voltage by equalizing capacitor 400.
DC/DC converter 3 is made up of two power switch pipes, two diodes and an inductance.Diode 300 is attempted by power switch 302 two ends, and diode 301 is attempted by power switch 303 two ends, and power switch 302 is connected with power switch 303, and one of inductance is connected to the mid point b1 place of power switch 302 and power switch 303.These power devices are finally formed the power inverter of Boost-Buck (buck) structure.When super capacitor group monomer voltage during greater than the voltage on the equalizing capacitor, power switch 302 conductings, power switch 303 by, power switch 302, diode 301, inductance 304 constitute booster circuit, the DC/DC converter is operated in the forward pressure-increasning state, and (so-called forward: the input of DC/DC converter is the super capacitor group, output is an equalizing capacitor), energy is transferred to balanced converter 400 from the super capacitor group; When super capacitor group monomer voltage during less than the voltage on the equalizing capacitor, power switch 302 ends, power switch 303 conductings, diode 300, inductance 304 constitute booster circuit, the DC/DC converter is operated in reverse pressure-increasning state, and (oppositely so-called: the input of DC/DC converter is an equalizing capacitor, output is the super capacitor group), energy is transferred to the super capacitor group from balanced converter 400.This two-way DC/DC transformer configuration is simple, energy consumption is little, stability is high and be easy to realization.
The gating order of switch arrays and the control mode of DC/DC converter are as shown in Figure 3.Concrete implementation step is as follows:
(1) judges the charging and discharging state of bank of super capacitors by the size and Orientation that detects electric current on the balance controller 4.If the super capacitor group is in charged state, the control strategy when then choosing charged state; Otherwise, the control strategy when choosing discharge condition.
(2), then carry out according to the following steps if super capacitor is in charged state:
1) detecting unit 5 detects super capacitor group 1 each monomer voltage (voltage of single super capacitor in the super capacitor group) and equalizing capacitor 4 voltages.
2) control unit 6 is found out the super capacitor of voltage maximum in the super capacitor group, and its voltage is designated as Umax, and sends control signal for switch arrays 2, and the super capacitor of voltage maximum is connected with the DC/DC converter.
3) power switch of 6 pairs of DC/DC converters 3 of control unit sends control signal, makes DC/DC converter 3 be operated in pressure-increasning state.
4) as Δ U aWith Δ U bSatisfy Δ U b〉=k Δ U aWhen (k ∈ [0,1]), control unit 6 sends signal to switch arrays 2, and the highest capacitor of new voltage is connected with the DC/DC converter.
Wherein: U FullRated voltage when being full of electricity for super capacitor, U NewBe the voltage of the electric capacity that the new voltage that produces is the highest in the charging process, U OldBe the capacitance voltage that links to each other with the DC/DC converter before; Δ U a=U Full-U New, Δ U b=U New-U Old, k is the arbitrary constant between [0,1].
(3), then carry out according to the following steps if super capacitor is in discharge condition:
1) detecting unit 5 detects super capacitor group 1 each monomer voltage and equalizing capacitor 4 voltages.
2) control unit 6 is found out voltage maximum (U in the super capacitor group Max) and minimum (U Min) super capacitor, and obtain their equal threshold voltage u Ave, compare U AveVoltage U with equalizing capacitor f
If U AveMore than or equal to equalizing capacitor voltage, then control unit 6 output control signals are joined the capacitor of switch arrays 2 gate voltage maximums and DC/DC converter 3, and control unit 6 makes it be operated in the forward pressure-increasning state to DC/DC converter 3 input control signals.Equalizing capacitor 4 is charged to U Av
If U AveLess than equalizing capacitor voltage, then control unit 6 output control signals are joined the capacitor of switch arrays 2 gate voltage minimums and DC/DC converter 3, and control unit 6 makes it be operated in reverse pressure-increasning state to DC/DC converter 3 input control signals.Equalizing capacitor is filled 4 to U Av,
3) repeating step 1), check whether serial connected super capacitance group 1 each monomer voltage satisfies accuracy of equalization control requirement, and the described accuracy of equalization comprises two indexs, i.e. voltage variance δ vWith the maximum voltage deviation delta vIf each monomer voltage satisfies voltage variance and the requirement of maximum voltage deviation simultaneously, then stops equilibrium.
Voltage variance δ vCalculate by following formula:
δ v = Σ i = 1 N ( v i - v avg ) 2 ≤ ϵ 1 , In the formula: v iBe in the super capacitor group monomer voltage value, v AvgBe the average voltage of each super capacitor of super capacitor group, N is the number of super capacitor in the super capacitor group, ε 1Be a positive set-point, value is 0.8 in the present embodiment, and it has determined the requirement to control precision.
The maximum voltage deviation delta vCalculate by following formula:
Δ v=max|v i-v j|≤ε 2, v i, v jBe respectively the magnitude of voltage of two different super capacitors in the super capacitor group, ε 2Also be a positive set-point, value is 0.25 in the present embodiment, and it has determined the permissible value of maximum voltage.

Claims (2)

1. voltage balancing device of super capacitor bank is characterized in that: comprise serial connected super capacitance group (1), switch arrays (2), DC/DC converter (3), equalizing capacitor (4), detecting unit (5) and control unit (6); Wherein: serial connected super capacitance group (1), switch arrays (2), DC/DC converter (3) is connected successively with equalizing capacitor (4), the input of detecting unit (5) is connected with equalizing capacitor (4) with serial connected super capacitance group (1), output is connected with the input of control unit (6), the output of control unit (6) is connected with DC/DC converter (3) with switch arrays (2), the control signal of control unit (6) output is come control switch array (2) and DC/DC converter (3), finally realizes the energy delivery between super capacitor group (1) and the equalizing capacitor (4).
2. a control method that is used for the described voltage balancing device of super capacitor bank of claim 1 is characterized in that, this method may further comprise the steps:
Detector (5) detects the electric current of equalizing capacitor (4), and give control unit (6) with this electric current transmission, control unit (6) is judged the charging and discharging state of bank of super capacitors (1) according to the size and Orientation of electric current on the detected equalizing capacitor, if the super capacitor group is in charged state, control strategy when then taking charged state, otherwise, the control strategy when taking discharge condition;
Control strategy during described charged state is as follows:
1) detecting unit (5) detects each monomer voltage of super capacitor group (1) and equalizing capacitor (4) voltage;
2) control unit (6) is found out the super capacitor of voltage maximum in the super capacitor group, and its voltage is designated as Umax, and sends control signal for switch arrays (2), and the super capacitor of voltage maximum is connected with the DC/DC converter;
3) control unit (6) sends control signal to the power switch of DC/DC converter (3), makes DC/DC converter (3) be operated in pressure-increasning state;
4) as Δ U aWith Δ U bSatisfy Δ U b〉=k Δ U aThe time, k ∈ [0,1], control unit (6) sends signal to switch arrays (2), and the highest capacitor of new voltage is connected with the DC/DC converter;
Wherein: U FullRated voltage when being full of electricity for super capacitor, U NewBe the voltage of the electric capacity that the new voltage that produces is the highest in the charging process, U OldBe the capacitance voltage that links to each other with the DC/DC converter before; Δ U a=U Full-U New, Δ U b=U New-U Old, k is the arbitrary constant between [0,1];
Control strategy during described discharge condition is as follows:
1) detecting unit (5) detects each monomer voltage of super capacitor group (1) and equalizing capacitor (4) voltage U f
2) control unit (6) is found out the maximum U of voltage in the super capacitor group MaxWith minimum U MinSuper capacitor, and obtain their average voltage U Ave, compare U AveVoltage U with equalizing capacitor f
If U AveMore than or equal to equalizing capacitor voltage, then control unit (6) output control signal is joined the capacitor of switch arrays (2) gate voltage maximum and DC/DC converter (3), control unit (6) is to DC/DC converter (3) input control signal, make it be operated in the forward pressure-increasning state, equalizing capacitor (4) is charged to U Av, U AvIt is the average of equalizing capacitor voltage and the super capacitor group monomer voltage in parallel with equalizing capacitor;
If U AveLess than equalizing capacitor voltage, then control unit (6) output control signal is joined the capacitor of switch arrays (2) gate voltage minimum and DC/DC converter (3), control unit (6) is to DC/DC converter (3) input control signal, make it be operated in reverse pressure-increasning state, equalizing capacitor is filled (4) to U Av
3) repeating step 1), check whether each monomer voltage of serial connected super capacitance group (1) satisfies accuracy of equalization control requirement, and the described accuracy of equalization comprises two indexs, i.e. voltage variance δ vWith the maximum voltage deviation delta vIf each monomer voltage satisfies voltage variance and maximum voltage deviation simultaneously, then stops equilibrium.
CN200910250248A 2009-12-11 2009-12-11 Voltage balancing device of super capacitor bank and control method thereof Pending CN101814773A (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102005826A (en) * 2010-11-17 2011-04-06 重庆大学 Power interface circuit for energy storage device with energy storage monomers connected in series
CN102570622A (en) * 2011-12-30 2012-07-11 合肥同智机电控制技术股份有限公司 Voltage-sharing device of super capacitors
CN102832661A (en) * 2012-08-06 2012-12-19 东南大学 Novel dynamic voltage sharing device for serially connected super capacitor bank
CN103427462A (en) * 2013-08-19 2013-12-04 中国科学院电工研究所 Charging circuit used for super capacitor group with voltage balancing capability
CN104527448A (en) * 2015-01-04 2015-04-22 南车株洲电力机车有限公司 Voltage equilibrium control method and system
US9564275B2 (en) 2012-03-09 2017-02-07 The Paper Battery Co. Supercapacitor structures
US9583277B2 (en) 2013-09-30 2017-02-28 The Paper Battery Company, Inc. Ultra-capacitor structures and electronic systems with ultra-capacitor structures
US9831533B2 (en) 2013-03-15 2017-11-28 The Paper Battery Co. Energy storage structures and fabrication methods thereof
CN108128173A (en) * 2017-12-27 2018-06-08 深圳市金能弘盛能源科技有限公司 For the protection circuit of super capacitor module
CN109888904A (en) * 2019-03-15 2019-06-14 中南大学 A kind of asynchronous compensation pressure-equalizing device and control method of vehicle-mounted super capacitor
CN111313117A (en) * 2020-03-27 2020-06-19 华霆（合肥）动力技术有限公司 Lossless passive equalization method and device for battery module and battery system
CN113746190A (en) * 2021-08-17 2021-12-03 湖南工商大学 Distributed cooperative control method and system for single voltage balance
WO2023065083A1 (en) * 2021-10-18 2023-04-27 深圳市华思旭科技有限公司 Circuit structure and control method therefor, and power source device

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102005826A (en) * 2010-11-17 2011-04-06 重庆大学 Power interface circuit for energy storage device with energy storage monomers connected in series
CN102570622B (en) * 2011-12-30 2014-03-26 合肥同智机电控制技术股份有限公司 Voltage-sharing device of super capacitors
CN102570622A (en) * 2011-12-30 2012-07-11 合肥同智机电控制技术股份有限公司 Voltage-sharing device of super capacitors
US9564275B2 (en) 2012-03-09 2017-02-07 The Paper Battery Co. Supercapacitor structures
US10153094B2 (en) 2012-03-09 2018-12-11 The Paper Battery Co. Supercapacitor structures
CN102832661A (en) * 2012-08-06 2012-12-19 东南大学 Novel dynamic voltage sharing device for serially connected super capacitor bank
CN102832661B (en) * 2012-08-06 2014-12-10 东南大学 Novel dynamic voltage sharing device for serially connected super capacitor bank
US9831533B2 (en) 2013-03-15 2017-11-28 The Paper Battery Co. Energy storage structures and fabrication methods thereof
CN103427462B (en) * 2013-08-19 2015-11-04 中国科学院电工研究所 A kind of bank of super capacitors charging circuit with electric voltage equalization ability
CN103427462A (en) * 2013-08-19 2013-12-04 中国科学院电工研究所 Charging circuit used for super capacitor group with voltage balancing capability
US9583277B2 (en) 2013-09-30 2017-02-28 The Paper Battery Company, Inc. Ultra-capacitor structures and electronic systems with ultra-capacitor structures
CN104527448A (en) * 2015-01-04 2015-04-22 南车株洲电力机车有限公司 Voltage equilibrium control method and system
CN108128173A (en) * 2017-12-27 2018-06-08 深圳市金能弘盛能源科技有限公司 For the protection circuit of super capacitor module
CN109888904A (en) * 2019-03-15 2019-06-14 中南大学 A kind of asynchronous compensation pressure-equalizing device and control method of vehicle-mounted super capacitor
CN111313117A (en) * 2020-03-27 2020-06-19 华霆（合肥）动力技术有限公司 Lossless passive equalization method and device for battery module and battery system
CN113746190A (en) * 2021-08-17 2021-12-03 湖南工商大学 Distributed cooperative control method and system for single voltage balance
WO2023065083A1 (en) * 2021-10-18 2023-04-27 深圳市华思旭科技有限公司 Circuit structure and control method therefor, and power source device

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Application publication date: 20100825