CN102324862B - Multilevel voltage pumping device - Google Patents

Multilevel voltage pumping device Download PDF

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CN102324862B
CN102324862B CN201110299613.6A CN201110299613A CN102324862B CN 102324862 B CN102324862 B CN 102324862B CN 201110299613 A CN201110299613 A CN 201110299613A CN 102324862 B CN102324862 B CN 102324862B
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power switching
diode
circuit
direct current
voltage
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CN102324862A (en
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程明
丁石川
邹国棠
王政
花为
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Southeast University
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Southeast University
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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

A kind of multilevel voltage pumping device
Technical field
The invention belongs to power electronics, field of power supplies, relate to a kind of Novel electric press pump and rise many level devices and control strategy thereof, being applicable to electric automobile and other is 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, replace traditional internal-combustion engines vehicle with electric automobile and become one of focus of current research, and be generally to obtain alternating current by inverter to the power supply of electric automobile power supply, inevitably can produce harmonic wave and interference, directly affect the runnability of electric automobile, in the urgent need to finding the power supply that a kind of harmonic content is little.Multi-electrical level inverter is compared with traditional two-level inversion device, can effectively reduce the electromagnetic interference of output voltage, because desired switching device voltage withstand class under little, the equal electric pressure of its harmonic wave of output voltage interference is lower, multi-electrical level inverter is widely used in every field.For electric automobile, fail safe, performance and loss from running are considered, more need the good power supply of Electro Magnetic Compatibility, the very little outstanding performance as multi-electrical level inverter of harmonic wave of output voltage content has determined that multi-electrical level inverter can be advantageously applied on electric automobile.
Existing multi-electrical level inverter has three kinds of topological structures, divides and is mainly: diode clamp multi-electrical level inverter, Flying capacitor multilevel inverter and cascaded multilevel inverter by structure.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 Flying capacitor multilevel inverter is more flexible, but also there is the problem that needs a large amount of electric capacity, and the multi-electrical level inverter of these two kinds of topological structures all cannot realize the function of boosting, 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 to cascade, can reach the object of voltage pump rise, but needs a large amount of independent DC power supplies.
The research in past shows, as obtained new many level devices, must on circuit structure, reform and just likely obtain positive result, but from the data of having published, there are two problems in new many level structure: the progression of the many level of one is decided by the quantity of certain or certain several device in circuit without exception, it is the so-called effect that is decided many level outputs by hardware condition, this means, as obtained better many level effect, must increase more number of devices, greatly increase cost; The pump liter of its two output voltage, substantially all obtained by the quantity that increases input power, so-called stack input voltage obtains high output voltage, and this has also improved the cost of device, and complexity to control strategy and the fail safe of system have all 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, with less component equipment, not only can 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, propose a kind of Novel electric press pump and risen many level devices, this device fully uses the thought of DC-DC voltage pump rise, construct new circuit topological structure, and export by inverter circuit, realize without additional independent current source and can promote output voltage, in addition, the level number that can realize easily output voltage by control unit increases arbitrarily, and without the components and parts in extra circuits, save cost, reduced the complexity of inverter circuit structure.Novel electric press pump rises many level devices can, flexibly by the method for software, change many level exponent number of output, obtains desirable sine output, is applicable to very much requiring harsh occasion for the THD of output voltage.
Technical scheme:
1, Novel electric press pump rises many level devices, 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; After described direct current output energy-storage units, connect successively two-way Buck/Boost circuit, part charge-discharge circuit and inverter circuit;
1) described two-way Buck/Boost circuit comprises inductance L, diode D and device for power switching Sa and Sb; Described device for power switching Sa and Sb are connected in parallel to diode;
Described Sa is connected between "+" utmost point and L of direct current output energy-storage units, is connected direct current and exports "+" utmost point of energy-storage units, the first end of the anodic bonding L of the diode in parallel with Sa with the negative electrode of the diode of Sa parallel connection;
Described Sb is connected between the first end of L and "-" utmost point of direct current output energy-storage units, and "-" utmost point of the anodic bonding direct current output energy-storage units of the diode in parallel with Sb is connected the first end of L with the negative electrode of the diode of Sb parallel connection;
The negative electrode of described D connects the second end of L, "-" utmost point of the anodic bonding direct current output energy-storage units of D;
2) described part charge-discharge circuit comprises:
2n equal-wattage switching device discharges and recharges device for power switching and is respectively S as discharging and recharging device for power switching, establishing 11, S 12, S 21, S 22, S n1, S n2; Each device for power switching parallel diode that discharges and recharges, forms and discharges and recharges power switch unit;
N-1 equal-wattage switching device is as voltage pump rise device for power switching; If voltage pump rise device for power switching is respectively S c1, S c2, S cn-1:
N same capacitance C 1, C 2c n, as part charging capacitor;
N diode Dn;
For arbitrary described S n1, S n2, C nand Dn, their Component units, pass through S between unit cn-1connect; For unit a: S n1the anode of corresponding diode all connects the 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 none 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) described 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 is connected with diodes in parallel;
Described 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 of described controller connects respectively the switch control end of each device for power switching in two-way Buck/Boost circuit, part charge-discharge circuit and inverter circuit; The control signal output of controller also connects the switch of controlling direct current output energy-storage units.
Described direct current output energy-storage units comprises DC source and switch, and switch connects the switch of controlling DC source output, this switch of controller output control signal control.
A kind of control strategy of described device, realized by described controller output control signal, control strategy is, by controlling the device for power switching in direct current output energy-storage units, two-way Buck/Boost circuit, part charge-discharge circuit and inverter circuit, to make corresponding part charging capacitor C nthe cycle that discharges and recharges meet 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 described as follows:
Several topological structures of existing multi-level circuit, although have fine help for the waveform that improves output voltage with the stress that reduces switching device, but all there are two intrinsic disadvantages, the one,, as obtained the i.e. more multistage level number of more desirable output waveform, must greatly increase the number of devices in circuit, this has just increased the volume of cost and device; Its two, the amplitude of output voltage and input voltage have strict proportionate relationship, can not realize pump liter, even if tandem type structure is in fact also 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 of voltage pump rise flexibly, in not increasing circuit under the prerequisite of number of devices, by the new circuit topological structure of ingenious structure, obtained on the one hand desirable sine output, the amplitude that has also realized on the other hand output voltage has had 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 of voltage pump rise, depend on control strategy simultaneously, i.e. so-called software approach, but not the quantity of increase hardware, realize the desirable many level outputs of sinuso sine protractor.Therefore, technical scheme provided by the invention is made up of two parts, and one for Novel electric press pump rises the circuit topology of many level devices, comprised hardware circuit and controller; Two is the control strategy of this device.Because the structure of this device is comparatively simple, control program is very flexible, 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 wish to obtain the larger 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 backward diode in parallel), capacitor C 1, C 2... C nwith voltage pump rise device for power switching S c1, S c2, S cn-1the part charge-discharge circuit of composition
Connect again by device for power switching S o1, S o2, S o3, S o4the inverter circuit of (above power switch all needs backward diode in parallel) composition; Controller is mainly for generation of control signal, in order to the device for power switching in Drive and Control Circuit.
Basic principle and control method that Novel electric press pump of the present invention rises many level devices are: in hardware circuit, two-way Buck/Boost circuit and the collaborative work of part charge-discharge circuit have completed and have discharged and recharged and voltage pump rise work, realize the two-way flow of energy between direct current output energy-storage units and electric capacity simultaneously, meanwhile, realized the output of voltage with multiple levels by basic inverter circuit.It is pointed out that voltage pump rise described in the present invention, not realized by the two-way Buck/Boost circuit in above-mentioned hardware circuit, but worked in coordination with by two-way Buck/Boost circuit and part charge-discharge circuit; And the core of this device is part charge-discharge circuit, the pump of voltage rises and is mainly completed by it.Detailed control method and specific embodiments will be narrated hereinafter.
This device both can be operated in low-frequency range, can be operated in again high band.This device output voltage has good sinusoidal degree, in principle can infinite approach sine wave, and THD is extremely low.The P-to-P voltage of this device output can change by adjust electric capacity number and the degree that discharges and recharges at every turn, 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 part charging capacitor.This device does not use the heavy expensive device such as transformer, and whole installation cost is low, and weight is little; Control simply, do not need complicated closed loop, PI control etc.
Beneficial effect:
1) saved transformer, saved multiple independently-powered DC power supply, only needed an increase and decrease part charging capacitor number can reach the object that promotes output voltage grade, simplified the structure, reduced the size of inverter and alleviated the weight of inverter.
2) by increasing the level number of output voltage to the thought of capacitive part charging, thereby make harmonic wave of output voltage content little, level number is more, and THD is less.
3) in whole device, the control of device for power switching is simple, without complicated control methods such as closed loops.
4) along with the increasing of output-voltage levels number, under equal electric pressure, desired device for power switching voltage withstand class is lower, thereby wider to the range of choice of device for power switching, cost is lower.
Accompanying drawing explanation
Fig. 1 is this principle of device schematic diagram
Fig. 2 is apparatus structure schematic diagram of the present invention;
Fig. 3 is for embodiment is described, the electrical block diagram that part charging capacitor quantity is 3;
Fig. 4 is the circuit described in the present invention, and in the time that part charging capacitor quantity is 3, power switch drives signal schematic representation;
Fig. 5 is that part charging capacitor quantity is the simulation data voltage waveform of 3 o'clock;
Fig. 6 is that the THD that is the simulation data voltage of 3 o'clock to part charging capacitor quantity analyzes;
Fig. 7 is that part charging capacitor quantity is the experiment out-put supply waveform (operating frequency is 50Hz) of 3 o'clock;
Fig. 8 is that the THD of experiment output voltage waveforms analyzes.
In figure: direct current output energy-storage units 1, two-way Buck/Boost circuit 2, the part charge-discharge circuit 3 being formed by device for power switching and electrochemical capacitor etc., inverter circuit 4, controller 5.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
Novel electric press pump provided by the invention rises many level devices, and as shown in Figure 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 backward diode in parallel), capacitor C 1, C 2... C nwith voltage pump rise device for power switching S c1, S c2, S cn-1the part charge-discharge circuit (3) of composition, then connect by device for power switching S o1, S o2, S o3, S o4the inverter circuit (4) of (above power switch all needs backward diode in parallel) composition; Controller (5) is mainly for generation of PWM ripple, in order to the device for power switching in control circuit.
Buck/Boost circuit (2) in circuit and part charge-discharge circuit (3) collaborative work have completed and have discharged and recharged and voltage pump rise work as shown in Figure 2, and can realize the two-way flow of energy between direct current output energy-storage units and electric capacity, meanwhile, control rightly the driving signal of basic inverter circuit (4), thereby realize the output of voltage with multiple levels.
In order to further illustrate the specific works mode of related circuit in the present invention, without loss of generality, selection part charging capacitor quantity is that the circuit of 3 o'clock is example, and specific works principle of the present invention is described.As shown in Figure 3, part charging capacitor quantity is shown in 3, Fig. 4 to circuit, is in the cycle, the driving signal schematic representation of each power switch in circuit shown in Fig. 3.
Suppose that the output AC voltage cycle is T, in circuit, have 3 part charging capacitors, front T/2, common inverter circuit output forward voltage, i.e. maintained switch pipe S o1, S o4open-minded, in the time, complete the classification charging to all part charging capacitors at [0, T/4], [T/4, T/2], in the time, completes the classification electric discharge to all part charging capacitors; Rear T/2, common inverter circuit output negative voltage, i.e. maintained switch pipe S o2, S o3open-minded, in the time, complete the classification charging to all part charging capacitors at [T/2,3T/4], [3T/4, T], in the time, completes the classification electric discharge to all part charging capacitors.Supposing that each part charging capacitor is divided equally is charged to given voltage value (generally, this magnitude of voltage is the terminal voltage of direct current output energy-storage units, gets m=2 in Fig. 4) for m time, and to establish direct current output energy-storage units magnitude of voltage be V i, specific works pattern 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 (be designated hereinafter simply as charge-discharge circuit, repeat no more) consisting of the part charge-discharge circuit being become with set of power switches by two-way Buck/Boost circuit is to the charging of part charging capacitor, and control switch pipe S a, S 12turn on and off, points 2 times by capacitor C 1voltage is charged to V i, also, according to being output as sinusoidal wave needs and the output voltage frequency of expectation, calculate switching tube S a, S 12each service time and ON time, make part charging capacitor C 1voltage through 2 times charging, be charged to respectively V i, V i/ 2, as shown in Figure 4, respectively at t 1-t 1, t 2-t 2, in the time period, open S a, S 12, and adopt in the same way to C 2, C 3charging, but that the power device of work is respectively switching tube S a, S 22; S a, S 32.It should be noted that when starting to C 2when charging, answer turning-on voltage pump to rise switching tube S c1, and keep S in whole pattern 1 c1open-minded, the rest may be inferred opens S c2, final in the forward cycle of output voltage, due to the voltage stack of each several part charging capacitor, voltage peak can reach 3V i, realized the object 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 sinusoidal wave needs and the requirement of output voltage frequency, calculate switching tube S b, S 31each service time and ON time, make part rush capacitor C 3each voltage all reduces V i/ 2, be depressurized to 0 through 2 electric discharges, at t 7-t 7 ', t 8-t 8 'in time period, open S b, S 31, and adopt in the same way to C 2, C 1electric discharge, that still open is switching tube S b, S 21; S b, S 11, meanwhile, carry out contrary operation with pattern 1, turn-off successively pump up voltage switch S c2, S c1, final output voltage can be down to 0.In addition as shown in Figure 4, t 7-t 7 ', t 8-t 8 'in time period, part charging capacitor C 3discharge loop is C 3 +→ S 31→ L → S b→ D 3→ C 3 -, therefore the energy major storage of electric discharge is in inductance L, at t 7 '-t 8, t 8 '-t 9in time period, by with S abackward diode and diode D in parallel, L, to power source charges, discharges the energy being stored in wherein.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, all right infinite approach sine wave, and voltage harmonic content is very little (be it should be noted that, the circuit of describing in Fig. 3 and Fig. 4 and control strategy, corresponding N value, m value are respectively 3,2).According to the above-mentioned description for main circuit basic functional principle in 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 conventionally, mainly by changing or the control strategy that improves inverter reduces THD, the multilevel voltage pumping device proposing in the present invention is by controlling the voltage of DC side, be that sinusoidal wave requirement increases voltage exponent number according to output voltage, thereby obtain 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.
Figure 5 shows that the described typical circuit of Fig. 3 is under the control strategy providing as Fig. 4, supply voltage is got 50V, the simulation waveform obtaining, and Fig. 6 has provided the THD analysis result of this waveform, analyzes and shows that the THD of this output voltage waveforms is 3.46%.Fig. 7, Figure 8 shows that output waveform and the THD analysis result thereof of experiment actual measurement, the THD of this output voltage is 3.916%.Can be proved by simulation result and experimental result, the Novel electric press pump described in this patent rises under the control strategy control that multi-level circuit can propose hereinbefore, effectively export the output voltage of near sinusoidal ripple, and the THD of this output voltage is very little.

Claims (2)

1. Novel electric press pump rises many level devices, 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; After described direct current output energy-storage units, connect successively two-way Buck/Boost circuit, part charge-discharge circuit and inverter circuit;
1) described two-way Buck/Boost circuit comprises inductance L, diode D and device for power switching Sa and device for power switching Sb; Described device for power switching Sa and device for power switching Sb are connected in parallel to diode;
Described device for power switching Sa is connected between "+" utmost point and inductance L of direct current output energy-storage units, be connected "+" utmost point of direct current output energy-storage units with the negative electrode of the diode of device for power switching Sa parallel connection, the first end of the anodic bonding inductance L of the diode in parallel with device for power switching Sa;
Described device for power switching Sb is connected between the first end of inductance L and "-" utmost point of direct current output energy-storage units, "-" utmost point of the anodic bonding direct current output energy-storage units of the diode in parallel with device for power switching Sb, is connected the first end of inductance L with the negative electrode of the diode of device for power switching Sb parallel connection;
The negative electrode of described diode D connects the second end of inductance L, "-" utmost point of the anodic bonding direct current output energy-storage units of diode D;
2) described part charge-discharge circuit comprises:
2n equal-wattage switching device discharges and recharges device for power switching and is respectively S as discharging and recharging device for power switching, establishing 11, S 12, S 21, S 22, S n1, S n2; Each device for power switching parallel diode that discharges and recharges, forms and discharges and recharges power switch unit;
N-1 equal-wattage switching device is as voltage pump rise device for power switching; If voltage pump rise device for power switching is respectively S c1, S c2, S cn-1;
N same capacitance C 1, C 2c n, as part charging capacitor;
N diode D 1, D 2dn;
The described device for power switching S that discharges and recharges i1, S i2, capacitor C i and diode Di be as one group, i=1,2,3 ... n, forms a unit; Between every two adjacent cells, pass through voltage pump rise device for power switching S ci-1connect; N is not less than 2 natural number;
For above-mentioned each unit: each device for power switching S that discharges and recharges i1the anode of diode in parallel all connects the second end of inductance L, each device for power switching S that discharges and recharges i2the anode of corresponding diode all connects "-" utmost point of direct current output energy-storage units, discharges and recharges device for power switching S i1the negative electrode of corresponding diode and discharge and recharge device for power switching S i2the negative electrode of corresponding diode passes through capacitor C iconnect; Diode D inegative electrode connect capacitor C ione end, discharge and recharge device for power switching S i2the negative electrode of corresponding diode also connects capacitor C ithe other end;
The tie point of the 1st unit and the 2nd unit is capacitor C 1with discharge and recharge device for power switching S 12connected one end of negative electrode of corresponding diode;
For 2nd～n-1 unit, capacitor C i-1two ends as the tie point of this unit and adjacent cells, voltage pump rise device for power switching S cn-1connect between the tie point of adjacent cells;
The tie point of n-1 unit and n unit is capacitor C nwith discharge and recharge device for power switching S n1connected one end of negative electrode of corresponding diode;
3) described 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 is connected with diodes in parallel;
Described device for power switching S o1, device for power switching S o3series connection, device for power switching S o2, device for power switching S o4series connection, device for power switching S o1and device for power switching S o2the negative electrode of corresponding diode all connects device for power switching S 11the negative electrode of corresponding diode, device for power switching S o3and device for power switching S o4the anode of corresponding diode all connects diode D nanode;
The control signal output of described controller connects respectively the switch control end of each device for power switching in two-way Buck/Boost circuit, part charge-discharge circuit and inverter circuit; The control signal output of controller also connects the switch of controlling direct current output energy-storage units;
Described controller adopts PWM control mode, and its control strategy is, by controlling the device for power switching in direct current output energy-storage units, two-way Buck/Boost circuit, part charge-discharge circuit and inverter circuit, to make corresponding part charging capacitor C ithe cycle that discharges and recharges meet sinusoidal wave needs and the requirement of output voltage frequency, and, to capacitor C idivide and discharge and recharge for m time.
2. install according to claim 1, it is characterized in that described direct current output energy-storage units comprises DC source and switch, switch and DC source are connected in series, and control DC source output, this switch of controller output control signal control.
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* Cited by examiner, † Cited by third party
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 Voltage pump rise multi-level device

Patent Citations (3)

* Cited by examiner, † Cited by third party
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 Voltage pump rise multi-level device

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