CN102324862A - A voltage pumping multilevel device - Google Patents
A voltage pumping multilevel device Download PDFInfo
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- CN102324862A CN102324862A CN201110299613A CN201110299613A CN102324862A CN 102324862 A CN102324862 A CN 102324862A CN 201110299613 A CN201110299613 A CN 201110299613A CN 201110299613 A CN201110299613 A CN 201110299613A CN 102324862 A CN102324862 A CN 102324862A
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- 238000005086 pumping Methods 0.000 title claims abstract 9
- 238000004146 energy storage Methods 0.000 claims abstract description 32
- 238000007599 discharging Methods 0.000 claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims abstract description 13
- 230000002457 bidirectional effect Effects 0.000 claims abstract 6
- 238000011217 control strategy Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 238000004088 simulation Methods 0.000 description 2
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- 238000002485 combustion reaction Methods 0.000 description 1
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Abstract
The invention relates to a multilevel voltage pumping device. One set of multilevel main inverter circuits capable of realizing voltage pumping output is combined with the corresponding on-off control policy, and the waveform of the output voltage has good sinusoidal property. Meanwhile, the pumping of the output voltage is realized in relative to input. The hardware circuit of the device comprises a DC output energy storage unit and a bidirectional Buck/Boost circuit and is followed by a partial charging and discharging circuit and an inverter circuit, wherein the partial charging and discharging circuit comprises charging and discharging power switches S11, S12, S21, S22... ...,Sn1, Sn2, capacitors C1, C2... ...Cn and voltage pumping power switches SC1, SC2... ...,SCn; the inverter circuit comprises power switches So1, So2, So3 and So4. A controller is mainly used for generating control signals and is used for driving the power switches in the control circuit. A new topological structure is put forward by using the existing DC-DC voltage pumping and multilevel inverting ideas, and the output voltage with excellent sinusoidal property is realized.
Description
Technical field
The invention belongs to power electronics, field of power supplies, relate to a kind of novel voltage pump and rise many level device and control strategy thereof, be applicable to that electric automobile and other are provided the power supply occasion of electric energy by direct current output energy-storage units.
Background technology
Along with becoming increasingly conspicuous of energy problem and environmental pollution; People more and more pay close attention to for green energy resource and biological environment; Replacing traditional internal-combustion engines vehicle with electric automobile becomes one of focus of current research, and the power supply of supplying power to electric automobile generally is to obtain alternating current through inverter, can produce harmonic wave and interference inevitably; Directly influence the runnability of electric automobile, press for and seek the little power supply of a kind of harmonic content.Multi-electrical level inverter is compared with traditional two-level inversion device; Can reduce the electromagnetic interference of output voltage effectively; Because desired switching device voltage withstand class is lower under little, the equal electric pressure of its harmonic wave of output voltage interference, multi-electrical level inverter is widely used in every field.For electric automobile; Fail safe from running, performance and loss are considered; More need Electro Magnetic Compatibility power supply preferably, the very little outstanding performance as multi-electrical level inverter of harmonic wave of output voltage content has determined multi-electrical level inverter to be advantageously applied on the electric automobile.
Existing multi-electrical level inverter has three kinds of topological structures, divides by structure to be mainly: diode clamp multi-electrical level inverter, striding capacitance multi-electrical level inverter and cascaded multilevel inverter.The diode clamp multi-electrical level inverter is fairly simple comparatively speaking, but needs a large amount of diodes; The relative diode clamp multi-electrical level inverter of striding capacitance multi-electrical level inverter is more flexible; But also existence needs the problem of a large amount of electric capacity; And the multi-electrical level inverter of these two kinds of topological structures all can't realize the function of boosting, and it is identical that the peak-to-peak value of output AC voltage and the direct current of input are surveyed voltage.The basic thought of cascaded multilevel inverter is that the traditional single phase inverter with independent DC power supply is carried out cascade, can reach the purpose that voltage pump rises, but needs a large amount of independent DC power supplies.
The research in past shows; As to obtain new many level device, must on circuit structure, reform just and might obtain positive result, but the data from having published; There are two problems without exception in new many level structure: the progression of the many level of one of which is decided by the quantity of certain or a few kinds of devices in the circuit; Be the so-called effect that decides many level to export by hardware condition, this means, as obtaining better many level effect; Must increase more number of devices, increase cost greatly; The pump liter of its two output voltage; Basically all obtain by the quantity that increases the input power supply; Promptly so-called stack input voltage obtains high output voltage, and this has also improved the cost of device, and the complexity of control strategy and the fail safe of system have all been proposed challenge.In view of the shortcoming of above-mentioned three kinds of traditional multi-electrical level inverter structures and the deficiency of part new construction, be necessary to invent a kind of new equipment, use less elements equipment, not only can the pump up voltage, can also make harmonic wave of output voltage content little.
Summary of the invention
Technical problem: the deficiency that the present invention is directed to existing multi-electrical level inverter designs, and has proposed a kind of novel voltage pump and has risen many level device, and this device is the thought of utilization DC-DC voltage pump liter fully; Constructed new circuit topological structure; And export through inverter circuit, realized that need not to add independent current source can promote output voltage, in addition; Can realize that easily the level number of output voltage increases arbitrarily through control unit; And need not the components and parts in the extra circuits, and practiced thrift cost, reduced the complexity of inverter circuit structure.The novel voltage pump rises many level device can change many level exponent number of output flexibly through the method for software, obtains desirable sine output, is fit to very much require harsh occasion for the THD of output voltage.
Technical scheme:
1, a kind of novel voltage pump rises many level device, it is characterized in that comprising direct current output energy-storage units, two-way Buck/Boost circuit, part charge-discharge circuit, inverter circuit and controller; Connect two-way Buck/Boost circuit, part charge-discharge circuit and inverter circuit successively behind the said direct current output energy-storage units;
1) said two-way Buck/Boost circuit comprises inductance L, diode D and device for power switching Sa and Sb; Said device for power switching Sa and Sb are connected in parallel to diode;
Said Sa is connected between "+" utmost point and L of direct current output energy-storage units, is connected "+" utmost point of direct current output energy-storage units with the negative electrode of Sa diode connected in parallel, is connected first end of L with the anode of Sa diode connected in parallel;
Said Sb is connected first end and the direct current of L and exports between "-" utmost point of energy-storage units, is connected "-" utmost point of direct current output energy-storage units with the anode of Sb diode connected in parallel, is connected first end of L with the negative electrode of Sb diode connected in parallel;
The negative electrode of said D connects second end of L, and the anode of D connects "-" utmost point of direct current output energy-storage units;
2) said part charge-discharge circuit comprises:
2n equal-wattage switching device be as discharging and recharging device for power switching, establishes to discharge and recharge device for power switching and be respectively S
11, S
12, S
21, S
22, S
N1, S
N2Each discharges and recharges all parallel diodes of device for power switching, constitutes to discharge and recharge power switch unit;
N-1 equal-wattage switching device is as voltage pump power per liter switching device; If voltage pump power per liter switching device is respectively S
C1, S
C2, S
Cn-1:
N same capacitance C
1, C
2C
n, as partial charging electric capacity;
N diode Dn;
For arbitrary said S
N1, S
N2, C
nAnd Dn, they constitute the unit, pass through S between each unit
Cn-1Connect; For unit a: S
N1The anode of corresponding diode all connects second end of L, S
N2The anode of corresponding diode all connects "-" utmost point of direct current output energy-storage units, and the negative electrode of two diodes passes through C
nConnect; D
nNegative electrode connect C
nAn end, S
N2The negative electrode of corresponding diode also connects C
nThis end;
Arbitrary C
nTwo ends as the tie point of this unit and adjacent cells, S
Cn-1Connect between the tie point of adjacent cells;
3) said inverter circuit comprises:
4 identical power switch units, each power switch unit comprises device for power switching S
O1, S
O2, S
O3And S
O4, each device for power switching all is connected in parallel with diode;
Said S
O1, S
O3Series connection, S
O2, S
O4Series connection, S
O1And S
O2The negative electrode of corresponding diode all connects S
11The negative electrode of corresponding diode, S
O3And S
O4The anode of corresponding diode all connects D
nAnode;
The control signal output ends of said controller connects the switch control end of each device for power switching in two-way Buck/Boost circuit, part charge-discharge circuit and the inverter circuit respectively; The control signal output ends of controller also connects the switch of control direct current output energy-storage units.
Said direct current output energy-storage units comprises DC source and switch, and switch connects the switch of control DC source output, this switch of controller output control signal control.
A kind of control strategy of said device; Realize by said controller output control signal; Control strategy is that the device for power switching through in control direct current output energy-storage units, two-way Buck/Boost circuit, part charge-discharge circuit and the inverter circuit makes corresponding partial charging capacitor C
nThe cycle of discharging and recharging meet the sinusoidal wave needs and the requirement of output voltage frequency, and, to C
nDivide and discharge and recharge for m time.
Principle of the present invention is explained as follows:
Several kinds of topological structures of existing multi-level circuit; Though fine help is arranged for waveform that improves output voltage and the stress that reduces switching device; But all there are two intrinsic disadvantages, the one,, as obtaining the promptly more multistage level number of more desirable output waveform; Then must increase the number of devices in the circuit greatly, this has just increased the volume of cost and device; Its two, output voltage amplitude and input voltage have strict proportionate relationship, can not realize the pump liter, even if the tandem type structure in fact also is to have adopted more power supply to superpose to obtain higher output voltage.Given this; The present invention has used the thought of existing multi-electrical level inverter and the relevant technologies that voltage pump rises flexibly; Under the prerequisite that does not increase number of devices in the circuit; Through the new circuit topological structure of ingenious structure, obtained desirable sine output on the one hand, realized also that on the other hand output voltage amplitude has had the pump liter than input voltage.
The key problem that quasi-solution of the present invention is determined is: propose new circuit structure to obtain the effect that voltage pump rises, depend on control strategy simultaneously, promptly so-called software approach, but not the quantity of increase hardware are realized many level outputs that sinuso sine protractor is desirable.Therefore, technical scheme provided by the invention is made up of two parts, and one for the novel voltage pump rises the circuit topology of many level device, comprised hardware circuit and controller; Two is the control strategy of this device.Because the structure of this device is comparatively simple; Controlling schemes very flexibly; The sinuso sine protractor of output voltage is very good; Therefore be very suitable for electric automobile, portable multimedia device, high-accuracy servo system and Aero-Space etc. and hope to obtain the bigger output voltage of change of rank, THD requires harsh occasion simultaneously.
Hardware circuit of the present invention comprises direct current output energy-storage units, two-way Buck/Boost circuit, after connect and discharge and recharge device for power switching S
11, S
12, S
21, S
22, S
N1, S
N2(above power switch all needs parallelly connected backward diode), capacitor C
1, C
2... C
nWith voltage pump power per liter switching device S
C1, S
C2, S
Cn-1The part charge-discharge circuit of forming
Connect again by device for power switching S
O1, S
O2, S
O3, S
O4The inverter circuit that (above power switch all needs parallelly connected backward diode) formed; Controller is mainly used in the generation control signal, in order to the device for power switching in the Drive and Control Circuit.
Basic principle and control method that novel voltage pump of the present invention rises many level device are: in the hardware circuit; Two-way Buck/Boost circuit and the collaborative work of part charge-discharge circuit have been accomplished to discharge and recharge with voltage pump and have been risen work; Realize the two-way flow of energy between direct current output energy-storage units and electric capacity simultaneously; Meanwhile, realize the output of voltage with multiple levels by basic inverter circuit.It is pointed out that the liter of voltage pump described in the present invention, is not to be realized by the two-way Buck/Boost circuit in the above-mentioned hardware circuit, but by two-way Buck/Boost circuit and the collaborative completion of part charge-discharge circuit; And the core of this device is the part charge-discharge circuit, and the pump of voltage rises mainly by its completion.Detailed control method and specific embodiments will be narrated hereinafter.
This device both can be operated in low-frequency range, can be operated in high band again.This device output voltage has good sinusoidal degree, in principle can be infinitely near sinusoidal wave, and THD is extremely low.The P-to-P voltage of this device output can through adjustment electric capacity number and at every turn the degree of discharging and recharging change; Therefore crest voltage can change flexibly; The voltage of the direct current output energy-storage units of its size and input does not have positive connection, and is decided by the control strategy of control unit and the number of partial charging electric capacity.This device does not use heavy expensive device such as transformer, and whole installation cost is low, and weight is little; Control is simple, does not need complicated closed loop, PI control etc.
Beneficial effect:
1) saved transformer, saved a plurality of independently-powered DC power supplys, only needed an increase and decrease partial charging electric capacity number can reach the purpose that promotes the output voltage grade, simplified the structure, reduced the size of inverter and alleviated the weight of inverter.
2) increase the level number of output voltage through the thought to the capacitive part charging, thereby make harmonic wave of output voltage content little, level number is many more, and THD is more little.
3) control of device for power switching is simple in the whole device, need not complicated control methods such as closed loop.
4) along with the increasing of output-voltage levels number, desired device for power switching voltage withstand class is lower under the equal electric pressure, thereby wideer to the range of choice of device for power switching, cost is lower.
Description of drawings
Fig. 1 is this principle of device sketch map
Fig. 2 is an apparatus structure sketch map of the present invention;
Fig. 3 is that partial charging electric capacity quantity is 3 electrical block diagram for embodiment is described;
Fig. 4 is the circuit described in the present invention, power switch drive signal sketch map when partial charging electric capacity quantity is 3;
Fig. 5 is 3 o'clock emulation output voltage waveforms for partial charging electric capacity quantity;
Fig. 6 is for to partial charging electric capacity quantity being the THD analysis of 3 o'clock emulation output voltage;
Fig. 7 is 3 o'clock experiment out-put supply waveform (operating frequency is 50Hz) for partial charging electric capacity quantity;
Fig. 8 analyzes for the THD of experiment output voltage waveforms.
Among the figure: direct current output energy-storage units 1, two-way Buck/Boost circuit 2, part charge-discharge circuit 3, inverter circuit 4, the controller 5 formed by device for power switching and electrochemical capacitor etc.
Embodiment
Below in conjunction with accompanying drawing the present invention is further specified.
Novel voltage pump provided by the invention rises many level device, and shown in accompanying drawing 2, this device comprises direct current output energy-storage units (1), two-way Buck/Boost circuit (2), after connect and discharge and recharge device for power switching S
11, S
12, S
21, S
22, S
N1, S
N2(above power switch all needs parallelly connected backward diode), capacitor C
1, C
2... C
nWith voltage pump power per liter switching device S
C1, S
C2, S
Cn-1The part charge-discharge circuit of forming (3) connects by device for power switching S again
O1, S
O2, S
O3, S
O4The inverter circuit (4) that (above power switch all needs parallelly connected backward diode) formed; Controller (5) is mainly used in and produces the PWM ripple, in order to the device for power switching in the control circuit.
Accomplished to discharge and recharge by Buck/Boost circuit (2) in the circuit shown in Figure 2 and part charge-discharge circuit (3) collaborative work and risen work with voltage pump; And can realize the two-way flow of energy between direct current output energy-storage units and electric capacity; Meanwhile; Control the drive signal of basic inverter circuit (4) rightly, thereby realize the output of voltage with multiple levels.
In order to further specify the concrete working method of related circuit among the present invention, be without loss of generality, selection partial charging electric capacity quantity is that 3 o'clock circuit is an example, and concrete operation principle of the present invention is described.Circuit is as shown in Figure 3, and partial charging electric capacity quantity is 3, and is shown in Figure 4, in one-period, and the drive signal sketch map of each power switch in the circuit shown in Figure 3.
Suppose that the output AC voltage cycle is T, have 3 partial charging electric capacity in the circuit, preceding T/2, common inverter circuit output forward voltage, i.e. maintained switch pipe S
O1, S
O4Open-minded, in the time, accomplish classification charging in [0, T/4] to all partial charging electric capacity, [T/4, T/2] accomplishes the classification discharge to all partial charging electric capacity in the time; Back T/2, common inverter circuit output negative voltage, i.e. maintained switch pipe S
O2, S
O3Open-minded, in the time, accomplish classification charging at [T/2,3T/4] to all partial charging electric capacity, [3T/4, T] accomplishes the classification discharge to all partial charging electric capacity in the time.Supposing that each partial charging electric capacity is divided equally is charged to given voltage value (generally speaking, this magnitude of voltage is the terminal voltage of direct current output energy-storage units, gets m=2 among Fig. 4) for m time, and to establish direct current output energy-storage units magnitude of voltage be V
i, concrete mode of operation can be divided into following four-stage in one-period:
Stage 1 [0, T/4]: maintained switch pipe S
O1, S
O4Open-minded, the charge-discharge circuit of forming through the part charge-discharge circuit that is become with set of power switches by two-way Buck/Boost circuit (be designated hereinafter simply as charge-discharge circuit, repeat no more) charges to partial charging electric capacity, and control switch pipe S
a, S
12Turn on and off, divide 2 times with capacitor C
1Voltage is charged to V
i, also, calculated switching tube S promptly according to being output as the sinusoidal wave needs and the output voltage frequency of expectation
a, S
12Each service time and ON time make the partial charging capacitor C
1Voltage through 2 times the charging, be charged to V respectively
i, V
i/ 2, as shown in Figure 4, respectively at t
1-t
1, t
2-t
2, open S in the time period
a, S
12, and adopt and give C in the same way
2, C
3Charging, but that the power device of work is respectively switching tube S
a, S
22S
a, S
32It should be noted that when beginning to C
2During charging, answer the turning-on voltage pump to rise switching tube S
C1, and in whole pattern 1, keep S
C1Open-minded, the rest may be inferred opens S
C2, final in the forward cycle of output voltage, because the stack of the voltage of each several part charging capacitor, voltage peak can reach 3V
i, realized the purpose of boosting.
Stage 2 [T/4, T/2]: maintained switch pipe S
O1, S
O4Open-minded, charge-discharge circuit is operated in discharge condition, switching tube S
aTurn-off S
b, S
31Open-minded, according to being output as the sinusoidal wave needs and the requirement of output voltage frequency, calculated switching tube S
b, S
31Each service time and ON time make part towards capacitor C
3Each voltage all reduces V
i/ 2, be depressurized to 0 through 2 discharges, promptly at t
7-t
7 ', t
8-t
8 'Open S in time period
b, S
31, and adopt in the same way to C
2, C
1Discharge, that still open is switching tube S
b, S
21S
b, S
11, meanwhile, carry out opposite operation with pattern 1, turn-off pump up voltage switch S successively
C2, S
C1, final output voltage can reduce to 0.As shown in Figure 4 in addition, t
7-t
7 ', t
8-t
8 'In time period, the partial charging capacitor C
3Discharge loop is C
3 +→ S
31→ L → S
b→ D
3→ C
3 -, therefore the energy of discharge mainly is stored in the inductance L, at t
7 '-t
8, t
8 '-t
9In time period, through with S
aThe backward diode and the diode D of parallel connection, L is to power source charges, release stored energy therein.C
1, C
2Discharge mode and above-mentioned C
3In full accord.
Stage 3 [T/2,3T/4]: maintained switch pipe S
O2, S
O3Open-minded.Other mode of operations and stage 1 are in full accord.
Stage 4 [3T/4, T]: maintained switch pipe S
O2, S
O3Open-minded.Other mode of operations and stage 2 are in full accord.So far the one-period of alternating voltage finishes.
Through above-mentioned control strategy, the output voltage of this device is that voltage peak is N * V
i, level number is 2 * m * N, along with the increase of m, N; Output voltage not only electric pressure is high, can also be unlimited near sinusoidal wave, and voltage harmonic content is very little (to be it should be noted that; Circuit of describing among Fig. 3 and Fig. 4 and control strategy, pairing N value, m value are respectively 3,2).According to above-mentioned description for main circuit basic functional principle among the present invention; Be not difficult to find out that the thinking that the present invention is different from general multi-electrical level inverter is: multi-electrical level inverter usually; Mainly be to reduce THD through the control strategy that changes or improve inverter; The voltage pump that is proposed among the present invention rises many level device then through the voltage of control DC side, increases the voltage exponent number according to output voltage for sinusoidal wave requirement, thereby obtains the very little output voltage of THD.Undoubtedly, such voltage offers electric automobile or as voltage source, will bring more excellent performance to electric automobile.
Shown in Figure 5 for the described typical circuit of Fig. 3 under the control strategy that provides like Fig. 4, supply voltage is got 50V, the simulation waveform that is obtained, Fig. 6 have provided the THD analysis result of this waveform, the analysis show that the THD of this output voltage waveforms is 3.46%.Fig. 7, output waveform and THD analysis result thereof for the experiment actual measurement shown in Figure 8, the THD of this output voltage is 3.916%.Can prove that by simulation result and experimental result the novel voltage pump described in this patent rises control strategy control that multi-level circuit can be proposed hereinbefore down, effectively export the output voltage of near sinusoidal ripple, and the THD of this output voltage is very little.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110299613.6A CN102324862B (en) | 2011-09-29 | 2011-09-29 | Multilevel voltage pumping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110299613.6A CN102324862B (en) | 2011-09-29 | 2011-09-29 | Multilevel voltage pumping device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102324862A true CN102324862A (en) | 2012-01-18 |
| CN102324862B CN102324862B (en) | 2014-06-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2987522A1 (en) * | 2012-02-24 | 2013-08-30 | Toshiba Kk | MULTI-LEVEL POWER SUPPLY |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158064A (en) * | 2011-01-26 | 2011-08-17 | 中国科学院等离子体物理研究所 | Turn-off power semiconductor device valve and tandem topology structure thereof |
| CN102185329A (en) * | 2011-05-04 | 2011-09-14 | 华北电力大学 | Super-capacitor-based DC voltage sag suppression device and suppression method thereof |
| CN202285372U (en) * | 2011-09-29 | 2012-06-27 | 东南大学 | A voltage pumping multilevel device |
-
2011
- 2011-09-29 CN CN201110299613.6A patent/CN102324862B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158064A (en) * | 2011-01-26 | 2011-08-17 | 中国科学院等离子体物理研究所 | Turn-off power semiconductor device valve and tandem topology structure thereof |
| CN102185329A (en) * | 2011-05-04 | 2011-09-14 | 华北电力大学 | Super-capacitor-based DC voltage sag suppression device and suppression method thereof |
| CN202285372U (en) * | 2011-09-29 | 2012-06-27 | 东南大学 | A voltage pumping multilevel device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2987522A1 (en) * | 2012-02-24 | 2013-08-30 | Toshiba Kk | MULTI-LEVEL POWER SUPPLY |
| US9787100B2 (en) | 2012-02-24 | 2017-10-10 | Kabushiki Kaisha Toshiba | Multilevel power supply |
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| CN102324862B (en) | 2014-06-18 |
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