CN103296731A - Zero current switch active equalization circuit of power batteries and implementation method - Google Patents
Zero current switch active equalization circuit of power batteries and implementation method Download PDFInfo
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Abstract
The invention discloses a zero current switch active equalization circuit of power batteries and an implementation method. Zero current switch equalization is performed on the two batteries with maximum voltage differences in a battery pack by utilizing an LC quasi-resonant circuit. The equalization circuit comprises an MCU (Microcontroller Unit), an equalization switching circuit and the LC quasi-resonant circuit. The equalization switching circuit is used for switching the LC quasi-resonant circuit between the batteries under the control of the MCU; the MCU obtains voltages of every power battery with the aid of a voltage acquisition circuit so as to determine a highest battery voltage and a lowest battery voltage and numbers of corresponding batteries, and if a maximum battery voltage difference value is larger than a battery equalization threshold value, the equalization circuit is started; in an equalization state, the MCU controls the equalization switching circuit to cyclically switch the LC quasi-resonant circuit between batteries of the highest voltage and the lowest voltage; and when a switching frequency emitted by the MCU is equal to a natural resonant frequency of an LC, the zero current switch equalization is achieved.
Description
Technical field
The present invention relates to a kind of new-energy automobile power control technology, especially a kind of electrokinetic cell Zero Current Switch is equalizing circuit and implementation method initiatively.
Background technology
At present, divide dissipative type and energy non-dissipative type two big classes.The energy dissipation type is by the shunting of discharging to the resistance in parallel of each cell in the battery pack, thereby realization is balanced.The energy non-dissipative type circuit adopts electric capacity, inductance as energy-storage travelling wave tube, utilizes common power converting circuit as the topology basis, takes to disperse or concentrated structure, realizes unidirectional or two-way charging scheme.
Energy dissipation type circuit structure is simple, but has the problem of energy dissipation and heat management.Shortcomings such as there is the circuit structure complexity in the energy non-dissipative type circuit, volume is big, cost is high, time for balance is long, high switching loss.
Chinese invention patent application (application number 201010572115.X) discloses a kind of equalizing resistance that utilizes battery cell in the battery pack has been carried out balanced circuit, mainly comprises controller, resistance commutation circuit and equalizing resistance.At first determine the dump energy of each battery cell according to the magnitude of voltage of gathering, controlling resistance commutation circuit battery cell that equalizing resistance and electric weight is higher is in parallel then, gives this battery cell discharge, thus the equilibrium of realization battery cell electric weight.This circuit is too high by the mode limit battery monomer voltage of energy consumption in fact, only is suitable for having the problem of energy dissipation and heat management in the static equilibrium.
Chinese invention patent application (application number 201210595724.6) has proposed a kind of condenser type battery equalizing circuit, and the every two adjacent batteries of this circuit share an electric capacity, and when the higher battery cell of electric capacity and voltage was in parallel, battery charged to electric capacity; When the lower battery cell of electric capacity and voltage was in parallel, electric capacity charged the battery.Through the charge and discharge of electric capacity, energy is transferred to the lower battery cell of voltage from the higher battery cell of voltage, thereby makes its voltage equate.But it is more to work as the series-connected cell amount of monomer, needed balanced electric capacity and switch module and drive circuit thereof are more, cause circuit bulky, and when the adjacent a plurality of monomer of the high and minimum battery of voltage, the balanced way of this " passing the flower while the drum is beaten " makes balanced efficient to reduce greatly.
Summary of the invention
The objective of the invention is for overcoming the problem of inconsistency between the battery cell of effectively to eliminate in the above-mentioned prior art in the battery pack, a kind of electrokinetic cell Zero Current Switch initiatively equalizing circuit and implementation method are provided, its can the real-time judge battery pack in the high and minimum battery cell of voltage, and it is carried out the Zero Current Switch equilibrium, because all being two battery cells at voltage difference maximum in the battery pack, each equilibrium carries out peak load shifting, greatly improve balanced efficient, thereby effectively reduced the inconsistency between the battery cell.
For achieving the above object, the present invention adopts following technical proposals:
A kind of electrokinetic cell Zero Current Switch is equalizing circuit initiatively, comprises microcontroller, and described microcontroller comprises analog-to-digital conversion module, two signal output parts and some general purpose I ends;
Described analog-to-digital conversion module is used for converting the voltage signal of voltage collection circuit collection to digital signal, thereby determines the high and minimum battery cell of voltage;
Described two signal output parts link to each other with the input of a multi-channel gating switch respectively, and a plurality of outputs of multi-channel gating switch input of the switch unit corresponding with each battery cell respectively link to each other; Described two signal output parts are for generation of the control signal of a pair of state complementation, and control LC quasi-resonance circuit switches between two battery cells;
Described general purpose I end links to each other with the control input end of multi-channel gating switch; The high monomer voltage that described general purpose I end is used for that the described microcontroller of decoding determines and the battery numbering of minimum monomer voltage correspondence, the conducting of control multi-channel gating switch will the pwm signal of described a pair of complementation be delivered to the input of the high and minimum battery cell correspondence switch unit of voltage respectively; A plurality of described switch units are formed balanced commutation circuit, the corresponding battery cell setting of each switch unit;
Each switch unit comprises that four drive chip and four metal-oxide semiconductor (MOS) metal tube metal-oxide-semiconductors; Wherein two metal-oxide-semiconductor differential concatenations namely drain and link to each other with the positive pole of battery cell with an end that drains after linking to each other, and the other end links to each other with the positive pole of described LC quasi-resonance circuit; Two other metal-oxide-semiconductor differential concatenation namely drains and links to each other with the negative pole of battery cell with an end that drains after linking to each other, and the other end links to each other with the negative pole of described LC quasi-resonance circuit.
Described control signal is pulse width modulating signal PWM.
A kind of electrokinetic cell Zero Current Switch is the implementation method of equalizing circuit initiatively,
Microcontroller utilizes voltage collection circuit, obtains each monomer voltage of electrokinetic cell, thereby determines high monomer voltage and minimum monomer voltage and corresponding battery cell numbering, if maximum monomer voltage difference greater than battery balanced threshold value, then starts equalizing circuit;
Under equilibrium state, the balanced commutation circuit of microprocessor controls is switched LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage;
When the highest battery cell of LC quasi-resonance circuit and voltage is in parallel, battery cell charges to capacitor C, when the minimum battery cell of described LC quasi-resonance circuit and voltage was in parallel, capacitor C was charged to battery cell, thereby realizes the continuous equilibrium of two battery cell voltages;
When the switching frequency that sends when microcontroller equals the natural resonance frequency of LC quasi-resonance circuit, the equilibrium of realization Zero Current Switch, and each equilibrium all is that two battery cells at voltage difference maximum in the battery pack carry out peak load shifting, greatly improve balanced efficient, effectively improved the inconsistency between battery cell.
The present invention utilizes LC quasi-resonance circuit that two battery cells of voltage difference maximum in the battery pack are carried out the Zero Current Switch equilibrium, and the electrokinetic cell equalizing circuit comprises microcontroller (MCU), balanced commutation circuit and LC quasi-resonance circuit, wherein,
Microcontroller (MCU) utilizes voltage collection circuit, obtain each monomer voltage of electrokinetic cell, thereby determine high monomer voltage and minimum monomer voltage and corresponding battery cell numbering, if maximum monomer voltage difference greater than battery balanced threshold value, then starts equalizing circuit; Under equilibrium state, the described balanced commutation circuit of microcontroller (MCU) control is switched described LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage, when the highest battery cell of LC and voltage is in parallel, battery cell charges to capacitor C, when the minimum battery cell of LC quasi-resonance circuit and voltage is in parallel, capacitor C is charged to battery cell, thereby realize the continuous equilibrium of two battery cell voltages, when the switching frequency that sends when described microcontroller equals the natural resonance frequency of described LC quasi-resonance circuit especially, the equilibrium of realization Zero Current Switch, and each equilibrium all is that two battery cells at voltage difference maximum in the battery pack carry out, greatly improve balanced efficient, effectively improved the inconsistency between battery cell.
Microcontroller comprises analog-to-digital conversion module, two signal output parts and some general purpose I ends.Wherein said analog-to-digital conversion module is used for converting the voltage signal of voltage collection circuit collection to digital signal, thereby determines the high and minimum battery cell of voltage; Described two signal output parts are controlled described LC quasi-resonance circuit and are switched between two battery cells for generation of the control signal of a pair of state complementation; The high monomer voltage that described general purpose I end is used for that the described microcontroller of decoding determines and the battery numbering of minimum monomer voltage correspondence; Described pwm signal is delivered to the switch unit of the high and minimum battery cell correspondence of voltage, thereby realize that LC quasi-resonance circuit switches between the high and minimum battery cell of voltage.
Balanced commutation circuit comprises a plurality of switch units, the corresponding battery cell setting of each switch unit, under the control of described microcontroller, switch unit switches LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage, realizes the Zero Current Switch equilibrium.
And two signal output parts of described microcontroller link to each other with the input of a multi-channel gating switch respectively, and a plurality of outputs of multi-channel gating switch input of the switch unit corresponding with each battery cell respectively link to each other; Described general purpose I end links to each other with the control input end of multi-channel gating switch.
Each switch unit comprises that further four drive chip and four metal-oxide semiconductor (MOS) metal tube metal-oxide-semiconductors.Wherein the end after two metal-oxide-semiconductor differential concatenations (drain electrode links to each other with drain electrode) links to each other with the positive pole of battery cell, and the other end links to each other with the positive pole of described LC quasi-resonance circuit; End after two other metal-oxide-semiconductor differential concatenation (drain electrode links to each other with drain electrode) links to each other with the negative pole of battery cell, and the other end links to each other with the negative pole of described LC quasi-resonance circuit.
Wherein, above-mentioned control signal is pulse width modulating signal PWM.
And described pulse width modulating signal PWM is further used for driving described switch unit, LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage is switched, and realized the Zero Current Switch equilibrium by the frequency of adjusting pwm signal.Described general purpose I end is further used for the battery cell numbering that voltage is high and minimum and deciphers, and controls the different passage outputs of multi-channel gating switch in real time, pwm signal is delivered to the switch unit of the high and minimum battery cell correspondence of voltage.
The invention has the beneficial effects as follows: by means of technique scheme, described microcontroller is according to the battery cell numbering of high monomer voltage and minimum monomer voltage correspondence, the pwm signal of described a pair of complementation is delivered to the input of the corresponding switch unit of the high and minimum battery cell of voltage respectively through the different passage conductings of IO encoded control multi-channel gating switch, controlling described LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage switches, especially, when the pwm signal frequency that sends equals described LC natural resonance frequency, the equilibrium of realization Zero Current Switch, and each equilibrium all is that two battery cells at voltage difference maximum in the battery pack carry out, greatly improve balanced efficient, effectively improved the inconsistency between battery cell.
Description of drawings
Fig. 1 is application principle figure of the present invention;
Fig. 2 be according to the present invention in governor circuit figure;
Fig. 3 be according to the present invention in PWM gating circuit figure;
Fig. 4 be according to the present invention in the balanced commutation circuit figure of LC.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
At can't effectively eliminating in the battery pack problem of inconsistency between the battery cell in the correlation technique, as shown in Figure 1, battery management system (BMS) can effectively be eliminated in the battery pack problem of inconsistency between the battery cell by technical scheme of the present invention.The present invention proposes, gathered the voltage signal of each battery cell by voltage collection circuit by microcontroller, determine the battery cell that voltage is high and minimum and judge whether to satisfy equilibrium condition, if satisfy condition, the balanced commutation circuit of microprocessor controls is switched described LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage, realize the continuous equilibrium of both voltages, when switching frequency equals LC quasi-resonance circuit resonant frequencies, form quasi-resonance and realize the Zero Current Switch equilibrium, and each equilibrium all is two battery cells at voltage difference maximum in the battery pack, greatly improved balanced efficient, thereby effectively reduce the inconsistency between the battery cell, and can save volume and the cost of equipment.
Describe embodiments of the invention below in detail.
According to embodiments of the invention, initiatively equalizing circuit of a kind of electric automobile power battery Zero Current Switch is provided, utilize LC quasi-resonance circuit that two battery cells of voltage difference maximum in the battery pack (for example, ferric phosphate lithium cell) are carried out the Zero Current Switch equilibrium.
Wherein, microcontroller (MCU) utilizes voltage collection circuit, obtains each monomer voltage of electrokinetic cell, thereby determines high monomer voltage and minimum monomer voltage and corresponding battery cell numbering, if maximum monomer voltage difference greater than battery balanced threshold value, then starts equalizing circuit;
Under equilibrium state, the described balanced commutation circuit of microcontroller (MCU) control is switched described LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage, when the highest battery cell of LC and voltage is in parallel, battery cell charges to capacitor C, when the minimum battery cell of LC and voltage is in parallel, capacitor C is charged to battery cell, thereby realizes the continuous equilibrium of two battery cell voltages;
When the switching frequency that sends when described microcontroller equals the natural resonance frequency of described LC especially, the equilibrium of realization Zero Current Switch, and each equilibrium all is that two battery cells at voltage difference maximum in the battery pack carry out, greatly improve balanced efficient, effectively improved the inconsistency between battery cell.
Wherein, microcontroller comprises analog-to-digital conversion module, two signal output parts and some general purpose I ends.Wherein said analog-to-digital conversion module is used for converting the voltage signal of voltage collection circuit collection to digital signal, thereby determines the high and minimum battery cell of voltage; Described two signal output parts are controlled described LC quasi-resonance circuit and are switched between two battery cells for generation of the control signal of a pair of state complementation; The high monomer voltage that described general purpose I end is used for that the described microcontroller of decoding determines and the battery numbering of minimum monomer voltage correspondence.
Balanced commutation circuit comprises a plurality of switch units, the corresponding battery cell setting of each switch unit, under the control of described microcontroller, switch unit switches LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage, realizes the Zero Current Switch equilibrium.
Particularly, two signal output parts of microcontroller link to each other with the input of a multi-channel gating switch respectively, and a plurality of outputs of multi-channel gating switch input of the switch unit corresponding with each battery cell respectively link to each other; Described general purpose I end links to each other with the control input end of multi-channel gating switch.
And each switch unit comprises that further four drive chip and four metal-oxide semiconductor (MOS) metal tube metal-oxide-semiconductors.Wherein the end after two metal-oxide-semiconductor differential concatenations (drain electrode links to each other with drain electrode) links to each other with the positive pole of battery cell, and the other end links to each other with the positive pole of described LC quasi-resonance circuit; End after two other metal-oxide-semiconductor differential concatenation (drain electrode links to each other with drain electrode) links to each other with the negative pole of battery cell, and the other end links to each other with the negative pole of described LC quasi-resonance circuit.
Wherein, described control signal is pulse width modulating signal PWM.And described pulse width modulating signal PWM is further used for driving described switch unit, LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage is switched, and realized the Zero Current Switch equilibrium by the frequency of adjusting pwm signal.Described general purpose I end is further used for the battery cell numbering that voltage is high and minimum and deciphers, and controls the different passage outputs of multi-channel gating switch in real time, pwm signal is delivered to the switch unit of the high and minimum battery cell correspondence of voltage.
Below in conjunction with Fig. 2 to Fig. 4, describe structure and the operation principle of microcontroller and balanced commutation circuit in detail.
The microcontroller of described equalizing circuit adopts Digital Signal Processing DSP(TMS320F2812) as shown in Figure 2; Multi-channel gating switch is realized as shown in Figure 3 by two CD4051; Metal-oxide-semiconductor drives chip (driving chip) and adopts HCPL_3120 as shown in Figure 4.
DSP(TMS320F2812) dispose as shown in Figure 2, GPIOA0/PWM1 and GPIOA1/PWM2 pin produce pwm signal PWM+ and the PWM-of a pair of complementation, and link to each other with the input of two CD4051 analog channels respectively; GPIOA6～GPIOA13 is as control input signal P0～P7 of two CD4051, respectively with its binary system control input end A, B, C and
Link to each other; Battery voltage sampling signal VBT1～VBT3 inserts pin ADCINA0～ADCINA2 and carries out high-precision A/D conversion, is used for the high and minimum battery cell of definite voltage and corresponding battery numbering.
As shown in Figure 3, be the PWM gating circuit of described microcontroller, realized by two CD4051 that CD4051 is the digital control simulant electronic switches of single 8 passages, have three binary system control input ends of A, B and C and
Totally 4 inputs have low conduction impedance and very low cut-off leakage current.Wherein a slice CD4051 delivers to PWM+ the switch unit of the highest battery cell correspondence of voltage under the control of controller DSP GPIOA10～GPIOA13 pin, and another sheet is delivered to PWM-the switch unit of the minimum battery cell correspondence of voltage under the control of controller DSPGPIOA6～GPIOA9 pin.
As shown in Figure 4, be described balanced main circuit, formed by balanced commutation circuit and a LC quasi-resonance circuit.Corresponding switch unit of every batteries monomer wherein, (except the head and the tail battery cell) drives chips and four metal-oxide semiconductor (MOS) metal tubes (hereinafter referred metal-oxide-semiconductor) composition by four.Wherein the end source electrode after two metal-oxide-semiconductor differential concatenations (drain electrode links to each other with drain electrode) links to each other with the positive pole of battery cell, and another source electrode links to each other with the positive pole of described LC quasi-resonance circuit; A source electrode after two other metal-oxide-semiconductor differential concatenation (drain electrode links to each other with drain electrode) links to each other with the negative pole of battery cell, and another source electrode links to each other with the negative pole of described LC quasi-resonance circuit.As shown in Figure 4, U1, Q1, D1 and U2, Q2, D2 are to being used for the switch unit of battery cell BT1; U3, Q3, D3, U4, Q4, D4 and U5, Q5, D5, U6, Q6, D6 are to being used for the switch unit of battery cell BT2; U7, Q7, D7 and U8, Q8, D8 are to being used for the switch unit of battery cell BT3.
Wherein the grid of metal-oxide-semiconductor links to each other with output 6 pins that drive chip HCPL_3120 by a resistance, and input 2 pins that drive chip HCPL_3120 link to each other with the output of multi-channel gating switch CD4051.
Controller DSP is, and the batteries in battery set monomer carries out voltage acquisition, determines high monomer voltage and minimum monomer voltage and corresponding battery numbering, and judges whether to satisfy balanced unlocking condition, if satisfy, carries out equilibrium.DSP will high monomer voltage correspondence the battery numbering and the battery of minimum monomer voltage correspondence number, by GPIOA6～GPIOA13 pin decoding, the switch unit that the PWM+ that control CD4051 sends controller DSP respectively and PWM-deliver to the highest and minimum battery cell correspondence of voltage, because two PWM opposite states, make LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage switch.
Suppose that battery cell BT1 voltage is the highest, battery cell BT3 voltage is minimum, and controller DSP is decoded into 0010 to GPIOA6～GPIOA9 pin, control CD4051 U0^ gating x2 road, PWM-is sent to the input that drives chip U7 by the x2 road of CD4051 U0^, and driven MOS pipe Q7 switch; Simultaneously GPIOA10～GPIOA13 pin is decoded into 0000, control CD4051 U0 gating x0 road, PWM+ is sent to the input that drives chip U1 by the x0 road of U0, and driven MOS pipe Q1 switch.When PWM+ is high level (PWM-is low level), the Q1 conducting, electric current enters LC quasi-resonance circuit from the drain electrode by Q1 of the positive pole of BT1, and gets back to the negative pole of cell BT1 by the inverse parallel diode D2 of the metal-oxide-semiconductor Q2 that connects with the BT1 negative pole, and BT1 charges to capacitor C.When PWM-is high level (PWM+ is low level), the Q7 conducting, electric current enters the positive pole of BT3 from the positive pole of LC quasi-resonance circuit by the drain electrode of Q7, and gets back to the negative pole of LC quasi-resonance circuit by the inverse parallel diode D8 of the metal-oxide-semiconductor Q8 that connects with the BT3 negative pole, and capacitor C is charged to BT3.Thereby realize the equilibrium of BT1 and BT3, when the PWM frequency equals the natural resonance frequency of LC quasi-resonance circuit, form quasi-resonance and realize the Zero Current Switch equilibrium especially.
In sum, by means of technique scheme of the present invention, LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage is switched.When the highest battery cell of LC quasi-resonance circuit and voltage is in parallel, battery cell charges to capacitor C, when the minimum battery cell of LC quasi-resonance circuit and voltage is in parallel, capacitor C is charged to battery cell, thereby realize the continuous equilibrium of two battery cell voltages, when switching frequency equals the natural resonance frequency of L quasi-resonance circuit C, form quasi-resonance and realize the Zero Current Switch equilibrium, what deserves to be mentioned is that each equilibrium all is that two battery cells at voltage difference maximum in the battery pack carry out, greatly improved balanced efficient, effectively improve the inconsistency between battery cell, and can save volume and the cost of equipment.
It should be noted that Fig. 1 to shown in Figure 3 only be a kind of specific embodiments that realizes that the LC quasi-resonance switches; also can adopt other connected mode that above-mentioned parts are connected in actual applications, and carry out connected mode change belong to protection scope of the present invention equally.
In addition, except LC quasi-resonance circuit optionally can being connected in parallel to certain battery cell by the scheme shown in Fig. 2 to 4, can also reach this purpose by switch arrays or in conjunction with the mode of other circuit devcies, concrete mode this paper enumerates no longer one by one.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. an electrokinetic cell Zero Current Switch active equalizing circuit is characterized in that comprise microcontroller, described microcontroller comprises analog-to-digital conversion module, two signal output parts and some general purpose I ends;
Described analog-to-digital conversion module is used for converting the voltage signal of voltage collection circuit collection to digital signal, thereby determines the high and minimum battery cell of voltage;
Described two signal output parts link to each other with the input of a multi-channel gating switch respectively, and a plurality of outputs of multi-channel gating switch input of the switch unit corresponding with each battery cell respectively link to each other; Described two signal output parts are for generation of the control signal of a pair of state complementation, and control LC quasi-resonance circuit switches between two battery cells;
Described general purpose I end links to each other with the control input end of multi-channel gating switch; The high monomer voltage that described general purpose I end is used for that the described microcontroller of decoding determines and the battery numbering of minimum monomer voltage correspondence, the conducting of control multi-channel gating switch will the pwm signal of described a pair of complementation be delivered to the input of the high and minimum battery cell correspondence switch unit of voltage respectively;
A plurality of described switch units are formed balanced commutation circuit, the corresponding battery cell setting of each switch unit;
Each switch unit comprises that four drive chip and four metal-oxide semiconductor (MOS) metal tube metal-oxide-semiconductors; Wherein two metal-oxide-semiconductor differential concatenations namely drain and link to each other with the positive pole of battery cell with an end that drains after linking to each other, and the other end links to each other with the positive pole of described LC quasi-resonance circuit; Two other metal-oxide-semiconductor differential concatenation namely drains and links to each other with the negative pole of battery cell with an end that drains after linking to each other, and the other end links to each other with the negative pole of described LC quasi-resonance circuit.
2. want 1 described circuit as right, it is characterized in that, described control signal is pulse width modulating signal PWM, and pwm signal is delivered to the switch unit of the high and minimum battery cell correspondence of voltage, thereby realizes that LC quasi-resonance circuit switches between the high and minimum battery cell of voltage.
3. the electrokinetic cell Zero Current Switch implementation method of equalizing circuit initiatively according to claim 1 is characterized in that,
Microcontroller utilizes voltage collection circuit, obtains each monomer voltage of electrokinetic cell, thereby determines high monomer voltage and minimum monomer voltage and corresponding battery cell numbering, if maximum monomer voltage difference greater than battery balanced threshold value, then starts equalizing circuit;
Under equilibrium state, the balanced commutation circuit of microprocessor controls is switched LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage;
When the highest battery cell of LC quasi-resonance circuit and voltage is in parallel, battery cell charges to capacitor C, when the minimum battery cell of described LC quasi-resonance circuit and voltage was in parallel, capacitor C was charged to battery cell, thereby realizes the continuous equilibrium of two battery cell voltages;
When the switching frequency that sends when microcontroller equals the natural resonance frequency of LC quasi-resonance circuit, the equilibrium of realization Zero Current Switch, and each equilibrium all is that two battery cells at voltage difference maximum in the battery pack carry out peak load shifting, greatly improve balanced efficient, effectively improved the inconsistency between battery cell.
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