CN102005826B - Power interface circuit for energy storage device with energy storage monomers connected in series - Google Patents
Power interface circuit for energy storage device with energy storage monomers connected in series Download PDFInfo
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- CN102005826B CN102005826B CN 201010547903 CN201010547903A CN102005826B CN 102005826 B CN102005826 B CN 102005826B CN 201010547903 CN201010547903 CN 201010547903 CN 201010547903 A CN201010547903 A CN 201010547903A CN 102005826 B CN102005826 B CN 102005826B
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- energy storage
- high frequency
- switching tube
- frequency power
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Abstract
The invention discloses a power interface circuit for an energy storage device with energy storage monomers connected in series. The energy storage device is divided into two energy storage modules which have the same number of energy storage monomers connected in series by the power interface circuit; and an improved asymmetry dual-buck power interface circuit is adopted. When the power interface circuit is used for charging or discharging, a conventional voltage equalizing unit is also divided into two voltage equalizing units corresponding to the two energy storage modules. A charging and discharging circuit and a circuit with a voltage equalizing function of the energy storage device are integrated by the power interface circuit, so that the control of charging and discharging power and the voltage equalization between the two energy storage modules are realized, simultaneously the voltage equalizing speeds among the energy storage monomers in the two energy storage modules are improved, and simultaneously charging and discharging power tracking speeds can also be improved.
Description
Technical field
The present invention relates to power interface circuit that two and the monomer series-connected energy storage device that forms of above energy storage are discharged and recharged.
Background technology
Energy storage devices such as high capacity cell (the present invention refers to rechargeable battery) and super capacitor; Mostly be by saying identical monomer series-connected the forming of several energy storage in theory; For example, the most frequently used high capacity cell of people is exactly the battery pack that is in series by several cells.Yet; Because each cell in the battery pack; At in fact really not identical (for example: internal resistance value is not quite identical); The charge-discharge performance that each cell showed is just real the same, and " short slab "---this has just influenced the useful life of battery pack also promptly to have what is called, even also will bring the problem of secure context.For example, when giving batteries charging, after a certain often cell had been full of earlier, other batteries are underfill still also.Owing to be to be connected in series, if the battery of these underfills is continued charging, that cell that has been full of just is in overcharge condition.The battery that is overcharged not only can shorten its useful life greatly, but also possibly cause the battery explosion that is overcharged.If overcharged for fear of a certain cell; And let charging device stop charging through certain overvoltage crowbar; This can cause more cell undercharge again; This not only causes the utilance of battery pack whole volume to reduce, and the life-span of these cells of long-term undercharge also will shorten the final certainly useful life that has also just shortened whole battery group.For this reason, people just are provided with pressure unit to special interpolation of the charge and discharge device that applies to this type energy storage device, even have improved corresponding circuit to this type energy storage device itself.In existing this type charge and discharge device, comprising charges puts the unit, realizes the pressure unit and the necessary sample circuit and the control unit of electric weight, voltage relative equilibrium between the energy storage monomer.Wherein, it is the charge power supply of energy storage device and outside direct current or the power interface circuit that couples together with electric loading that the unit is put in charging, but the unit buck power interface circuit of employing energy two-way flow how are at present put in charging; Pressure unit plays and can prevent that individual cell from overcharging; Can guarantee that again all the other batteries can be full of the effect of electricity; The at present equalizing circuits that adopt the energy transfer type of pressure unit more, the equalizing circuit of energy transfer type has all presses precision high, the advantage of waste little energy; But its pressure rate is limited by the number of the energy storage monomer of series connection, and energy storage monomer number is many more, and its pressure rate is slow more.And the power interface circuit of unit is put in existing charging and the circuit of pressure unit is separate; Promptly existing power interface circuit itself does not possess uniform voltage function, can not assist pressure unit to improve the pressure rate of each series connection accumulation monomer when discharging and recharging in the energy storage device.
Summary of the invention
The objective of the invention is, propose a kind ofly can assist the whole pressure rate that improves charging energy storage device when putting, himself possess the power interface circuit of the monomer series-connected energy storage device of the energy storage of uniform voltage function.
Technical scheme of the present invention is the power interface circuit of the monomer series-connected energy storage device of a kind of like this energy storage; With the identical aspect of existing power interface circuit be; One end of this power interface circuit is connected with DC power supply or DC load, and the other end is connected with energy storage device; When discharging and recharging, this power interface circuit also will be connected with control unit through sample circuit, also will be equipped with corresponding pressure unit in the energy storage device.Its improvements are, said energy storage device is divided into identical energy storage module I of the monomer series-connected quantity of energy storage and energy storage module II, and this power interface circuit comprises two inductance, a times of high frequency power switching tube and two high frequency power switching tubes; The positive pole of said DC power supply or DC load is connected with a times high frequency power switching tube; The other end of this times high frequency power switching tube is connected by high frequency power switching tube I, inductance I and energy storage module I and constitutes on the high frequency power switching tube I and the node between the inductance I in the loop, and the node between said energy storage module I and the high frequency power switching tube I is common point I; The negative pole of said DC power supply or DC load is connected by high frequency power switching tube II, inductance II and energy storage module II and constitutes on the high frequency power switching tube II and the node between the inductance II in the loop; Node between said energy storage module II and the high frequency power switching tube II is common point II, and this common point II is connected with said common point I; Wherein, Described three power switch pipes are controlled by said control unit when discharging and recharging; The conducting sequential of these three power switch pipes does, begins conducting at a switch periods medium-high frequency power switch pipe I from initial time, and high frequency power switching tube II begins conducting with the hysteresis half period; Times high frequency power switching tube turn-offs when high frequency power switching tube I and the equal conducting of high frequency power switching tube II, and all the other are all conductings constantly; When discharging and recharging, said pressure unit is divided into and energy storage module I and corresponding respectively pressure unit I and the pressure unit II of energy storage module II.
From scheme, can find out; The present invention is divided into two groups of identical energy storage modules of the monomer series-connected quantity of energy storage to energy storage device; And when utilization the present invention discharges and recharges, two pressure units corresponding also have been divided into to existing pressure unit (at this moment, also having saved a basic equalizer circuit) with them.Thisly be divided into the method for two energy storage modules to energy storage device, and each energy storage module cooperates the benefit of a pressure unit to be, when charging is put, not only can all press two parts energy storage module; And after the series connection amount of monomer that pressure unit is corresponding is reduced to original half; Just effectively shortened the separately energy Flow path of pressure unit when all pressing, back; Thereby improve in the whole energy storage device balancing speed of voltage between the energy storage monomer, and reduced energy loss.In brief; When utilization is of the present invention; Be equivalent to combine its charging and discharging road and equalizer circuit; Make power interface circuit of the present invention have charging and discharging road function and uniform voltage function simultaneously, promptly when the power dynamic response requirement was put in satisfied charging, auxiliary pressure unit had improved pressure rate and has all pressed effect.
It can also be seen that from scheme charging and discharging of the present invention road is the equal of to have used asymmetric two existing buck power interface circuit.Because the staggered control of two high frequency power switching tubes in this circuit; Make times high frequency power switching tube operating frequency in the circuit to double; Thereby the cut-off frequency of the power control loop in control unit joint can correspondingly double, and obtained the effect that power response speed is put in the charging of bring to power interface circuit again.
Obviously; When not only being adapted at charging, the present invention uses; And can combine the composite type energy storage device that formation has the balance charge/discharge effect with pure energy storage device, and can greatly prolong the useful life of energy storage device itself, guarantee making full use of of energy storage device capacity.
Description of drawings
Fig. 1---power interface circuit of the present invention and sample circuit, control unit schematic diagram
Fig. 2---the enlarged drawing of power interface circuit among Fig. 1
Fig. 3---the schematic diagram of control unit among Fig. 1
Fig. 4---the schematic diagram when being divided into two-part pressure unit among Fig. 1 and combining with two energy storage modules
Fig. 5---the switching sequence figure that control is adopted
The voltage difference figure of Fig. 6---two energy storage modules
Fig. 7---current waveform figure on times high frequency power switching tube
Fig. 8---inductance I goes up current waveform figure
Fig. 9---inductance II goes up current waveform figure
Figure 10---power controlling set-point oscillogram
Figure 11---actual power pursuit gain oscillogram
Embodiment
The power interface circuit of the energy storage device that a kind of energy storage is monomer series-connected (with reference to figure 1,2), an end of this power interface circuit is connected with DC power supply or DC load, and the other end is connected with energy storage device; When discharging and recharging, this power interface circuit also will be connected with control unit CON through sample circuit, also will be equipped with corresponding pressure unit in the energy storage device.Among the present invention, said energy storage device is divided into identical energy storage module I of the monomer series-connected quantity of energy storage and energy storage module II, and this power interface circuit comprises two inductance (L
1, L
2), a times of high frequency power switching tube S
0With two high frequency power switching tube (S
1, S
2); The positive pole of said DC power supply or DC load and times high frequency power switching tube S
0Series connection, this times high frequency power switching tube S
0The other end be connected S by high frequency power switching tube I
1, inductance I L
1Constitute the high frequency power switching tube I S in the loop with energy storage module I
1With inductance IL
1Between node on, said energy storage module I and high frequency power switching tube I S
1Between node be common point I; The negative pole of said DC power supply or DC load is connected the S by high frequency power switching tube II
2, inductance II L
2Constitute the high frequency power switching tube II S in the loop with energy storage module II
2With inductance II L
2Between node on, said energy storage module II and high frequency power switching tube II S
2Between node be common point II, this common point II is connected with said common point I; Wherein, described three power switch pipe (S
0, S
1, S
2) when discharging and recharging, be controlled by said control unit CON, these three power switch pipe (S
0, S
1, S
2) the conducting sequential do, at a switch periods medium-high frequency power switch pipe I S
1Begin conducting from initial time, its duty ratio depends on value and power reference, high frequency power switching tube II S
2The hysteresis half period is begun conducting, and its duty ratio depends on voltage target difference zero, i.e. high frequency power switching tube I S
1With high frequency power switching tube II S
2The staggered 180 ° of phase sequences, times high frequency power switching tube S of differing of control signal
0At high frequency power switching tube I S
1With high frequency power switching tube II S
2All turn-off during conducting, all the other are all conductings (with reference to figure 5) constantly.When discharging and recharging, said pressure unit is divided into and energy storage module I and corresponding respectively pressure unit I and the pressure unit II of energy storage module II.
In conjunction with the understanding to beneficial effect of the present invention, based on above-mentioned disclosure, those skilled in the art possibly adopt all sample circuits and/or the control module that are fit to this case in the prior art fully when using power interface circuit of the present invention.For the help those of ordinary skill is more in depth understood, and even realize the present invention, will do further to disclose to the sample circuit, control unit and the pressure unit that are adopted in this embodiment below.
In this embodiment, its sample circuit comprises (with reference to figure 1), is parallel to the voltage sensor VT at DC power supply or DC load two ends, is parallel to the voltage sensor (VT at energy storage module I and energy storage module II two ends respectively
1, VT
2), be connected on DC power supply or DC load and high frequency power switching tube S doubly
0Between current sensor CT; Described three voltage sensors (VT, VT
1, VT
2) be connected with said control unit CON with current sensor CT, with the output sampled signal; This control unit CON receives outside given value and power reference Pref simultaneously.
In this embodiment, its control unit CON adopts traditional P I to regulate, and realizes power tracking and all decoupling zero control (with reference to figure 3) of pressure through the feedforward decoupling zero.Specifically comprise: magnitude of voltage V that will transmit and current value I by the voltage sensor VT and the current sensor CT at said DC power supply or DC load two ends multiply each other and the multiplier Mux of actual power value
1, with this multiplier Mux
1Actual power value and the said value and power reference Pref of feedback compares and adder I Add that must power difference DELTA P
1, with the voltage sensor (VT at energy storage module I and energy storage module II two ends
1, VT
2) the energy storage module I magnitude of voltage V that transmits
1With energy storage module II magnitude of voltage V
2Compare and obtain the adder IIAdd of voltage difference Δ V
2, and four adjuster (PI
1, PI
2, PI
3, PI
4), adder IIIAdd
3, adder IVAdd
4, pulse width modulator I PWM
1, pulse width modulator IIPWM
2With not gate &; Said power difference DELTA P is leaded up to an adjuster PI
1With lead up to two adjuster (PI by voltage difference Δ V
2, PI
4) the feedforward decoupling zero link that constitutes is summarized in adder IVAdd
3Thereby get power modulation signal P
c, this power modulation signal P
cThrough pulse width modulator I PWM
1Generate signal and drive high frequency power switching tube S
1Another road of said voltage difference Δ V is through an adjuster PI
2With by another road of power difference DELTA P through two adjuster (PI
1, PI
3) the feedforward decoupling zero link that constitutes is summarized in adder IVAdd
4Thereby get voltage modulation signal V
c, this voltage modulation signal V
cThrough pulse width modulator II PWM
2Generate signal and drive high frequency power switching tube S
2By said pulse width modulator I PWM
1With pulse width modulator IIPWM
2The signal that generates is simultaneously also through said NAND gate
Synthetic another signal drives a times high frequency power switching tube S
0
In embodiment; But the basic equalizer circuit that its pressure unit is made up of the buck-boost circuit of energy two-way flow and corresponding control section is formed; But the buck-boost circuit through the energy two-way flow is realized the transfer of energy between adjacent two energy storage monomers; But promptly every adjacent two energy storage monomers need be equipped with the buck-boost circuit and the corresponding required control section of an energy two-way flow, and then realize the electric voltage equalization between all series connection accumulation monomers (with reference to figure 4) in the whole energy storage module.Basic equalizer circuit specifically comprises: two power switch pipe (S
a, S
b) and an inductance L
a, and a controller CON
a, the positive pole of energy storage monomer I and power switch pipe I S
aSeries connection, power switch pipe I S
aThe other end and power switch pipe II S
bSeries connection, power switch pipe II S
bThe other end negative pole that is connected to the energy storage monomer II constitute a loop; Be initiating terminal with the node between energy storage monomer I and the energy storage monomer II again, with inductance L
aSeries connection, inductance L
aThe other end be connected to power switch pipe I S
aWith power switch pipe IIS
bBetween node.Controller CON
aThe output two path control signal drives two power switch pipe (S
a, S
b) conducting or shutoff.
The power interface circuit of the present invention that discloses below in conjunction with above-mentioned embodiment and the sample circuit and the control unit that use when of the present invention realize that to this power interface circuit power tracking and the process of all pressing do further introduction.
At first the voltage target difference zero between value and power reference Pref and energy storage module I and the energy storage module II is put in the target setting charging in control unit CON.Sample circuit feeds back to control unit with each voltage signal and current signal, and the voltage difference between performance number and two the energy storage modules is put in the actual charging that in control unit, calculates feedback.And then respectively power offset value and voltage deviation value are modulated decoupling zero by control unit and calculate, the control signal that obtains three power switch pipes respectively is switch control time sequence (with reference to figure 5).Needing ben is high frequency power switching tube I S
1With high frequency power switching tube II S
2Control signal staggered differ 180 ° of phase sequences, and high frequency power switching tube S doubly
0Control signal be by high frequency power switching tube I S
1With high frequency power switching tube II S
2Control signal synthetic.To the control that turns on and off of three power switch pipes, realize the target (with reference to figure 6) of the balance of voltage between the energy storage module, and finally realize the target of the balance of voltage between the energy storage monomer through pressure unit.Because the particular switch control timing (with reference to figure 5) that this circuit adopts is inductance (L as the electric current change frequency on times HF switch of performance number feedback
1, L
2) go up the twice (with reference to figure 7,8,9) of electrorheological frequency; The electrorheological frequency is consistent on electric current change frequency in the general buck power interface circuit on the main switch and the inductance; This circuit can double the cut-off frequency that power control loop is put in charging, can significantly improve power tracking speed (with reference to Figure 10,11).
Claims (3)
1. the power interface circuit of the monomer series-connected energy storage device of an energy storage, an end of this power interface circuit is connected with DC power supply or DC load, and the other end is connected with energy storage device; When discharging and recharging; This power interface circuit also will be connected with control unit (CON) through sample circuit; Also to be equipped with corresponding pressure unit in the energy storage device; It is characterized in that said energy storage device is divided into identical energy storage module I of the monomer series-connected quantity of energy storage and energy storage module II, said power interface circuit comprises inductance I (L
1), inductance II (L
2), times high frequency power switching tube (S
0), high frequency power switching tube I (S
1) and high frequency power switching tube II (S
2); The positive pole of said DC power supply or DC load and times high frequency power switching tube (S
0) series connection, this times high frequency power switching tube (S
0) the other end be connected by high frequency power switching tube I (S
1), inductance I (L
1) and energy storage module I constitute the high frequency power switching tube I (S in the series loop
1) and inductance I (L
1) between node on, said energy storage module I and high frequency power switching tube I (S
1) between node be the common point I; The negative pole of said DC power supply or DC load is connected by high frequency power switching tube II (S
2), inductance II (L
2) and energy storage module II constitute the high frequency power switching tube II (S in the series loop
2) and inductance II (L
2) between node on, said energy storage module II and high frequency power switching tube II (S
2) between node be the common point II, this common point II is connected with said common point I; Wherein, described three power switch pipe (S
0, S
1, S
2) when discharging and recharging, be controlled by said control unit (CON), these three power switch pipe (S
0, S
1, S
2) the conducting sequential do, at a switch periods medium-high frequency power switch pipe I (S
1) begin conducting from initial time, high frequency power switching tube II (S
2) the hysteresis half period is begun conducting, times high frequency power switching tube (S
0) at high frequency power switching tube I (S
1) and high frequency power switching tube II (S
2) all turn-off during conducting, all the other are all conductings constantly; When discharging and recharging, said pressure unit is divided into and energy storage module I and corresponding respectively pressure unit I and the pressure unit II of energy storage module II.
2. according to the power interface circuit of the monomer series-connected energy storage device of the said energy storage of claim 1; It is characterized in that; Said sample circuit comprises, is parallel to the voltage sensor (VT) at DC power supply or DC load two ends, is parallel to the voltage sensor (VT at energy storage module I and energy storage module II two ends respectively
1, VT
2), be connected on DC power supply or DC load and high frequency power switching tube (S doubly
0) between current sensor (CT); Described three voltage sensors (VT, VT
1, VT
2) be connected with said control unit (CON) with current sensor (CT), with the output sampled signal; This control unit (CON) receive simultaneously outside given value and power reference (
Pref).
3. according to the power interface circuit of the monomer series-connected energy storage device of the said energy storage of claim 2; It is characterized in that said control unit (CON) comprising: the magnitude of voltage that will transmit by the voltage sensor (VT) and the current sensor (CT) at said DC power supply or DC load two ends (
V) and current value (
I) multiply each other and the multiplier (Mux of actual power value
1), with this multiplier (Mux
1) feedback actual power value and said value and power reference (
Pref) compare and power difference (△
P) adder I (Add
1), with the voltage sensor (VT at energy storage module I and energy storage module II two ends
1, VT
2) transmit energy storage module I magnitude of voltage (
V 1 ) and energy storage module II magnitude of voltage (
V 2 ) compare and obtain voltage difference (△
V) adder II (Add
2), and four adjuster (PI
1, PI
2, PI
3, PI
4), adder III (Add
3), adder IV (Add
4), pulse width modulator I (PWM
1), pulse width modulator II (PWM
2) and NAND gate (
); Said power difference (△
P) lead up to adjuster I (PI
1) and by voltage difference (△
V) lead up to adjuster II (PI
2) and adjuster IV (PI
4) the feedforward decoupling zero link that constitutes is summarized in adder IV (Add
3Thereby) the power modulation signal (
P c ), this power modulation signal (
P c ) through pulse width modulator I (PWM
1) generate signal and drive high frequency power switching tube I (S
1); Said voltage difference (△
V) another road is through adjuster II (PI
2) and by power difference (△
P) another road is through adjuster I (PI
1) and adjuster III (PI
3) the feedforward decoupling zero link that constitutes is summarized in adder IV (Add
4Thereby) voltage modulation signal (
V c ), this voltage modulation signal (
V c ) through pulse width modulator II (PWM
2) generate signal and drive high frequency power switching tube II (S
2); By said pulse width modulator I (PWM
1) and pulse width modulator II (PWM
2) signal that generates simultaneously also through said NAND gate (
) synthetic another signal drives a times high frequency power switching tube (S
0).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010547903 CN102005826B (en) | 2010-11-17 | 2010-11-17 | Power interface circuit for energy storage device with energy storage monomers connected in series |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010547903 CN102005826B (en) | 2010-11-17 | 2010-11-17 | Power interface circuit for energy storage device with energy storage monomers connected in series |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102005826A CN102005826A (en) | 2011-04-06 |
| CN102005826B true CN102005826B (en) | 2012-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010547903 Expired - Fee Related CN102005826B (en) | 2010-11-17 | 2010-11-17 | Power interface circuit for energy storage device with energy storage monomers connected in series |
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|---|---|
| CN (1) | CN102005826B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103287249A (en) * | 2012-02-28 | 2013-09-11 | 黄承丰 | Mixed energy device |
| CN103094963B (en) * | 2013-01-18 | 2015-04-29 | 李相哲 | Twice battery pack balanced method based on battery power capacity and balanced circuit thereof |
| CN104917253B (en) * | 2015-06-20 | 2018-11-06 | 江苏博强新能源科技股份有限公司 | BMS charging and discharging control circuit |
| CN107565183B (en) * | 2017-09-07 | 2020-05-22 | 山东大学 | Full-life-cycle application-oriented modular distributed battery management system and method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7391132B2 (en) * | 2004-12-03 | 2008-06-24 | Huei-Jung Chen | Methods and apparatus providing double conversion/series-parallel hybrid operation in uninterruptible power supplies |
| CN100566076C (en) * | 2007-06-30 | 2009-12-02 | 杭州中恒电气股份有限公司 | The equalizer circuit of back-up source |
| CN101685975B (en) * | 2008-09-27 | 2013-02-27 | 力博特公司 | Method and device of soft start of bus voltage in uninterruptible power supply |
| CN101814773A (en) * | 2009-12-11 | 2010-08-25 | 北京工业大学 | Voltage balancing device of super capacitor bank and control method thereof |
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2010
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| CN102005826A (en) | 2011-04-06 |
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