CN108889096B - Pulse corona discharge plasma power supply based on module superposition - Google Patents
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- CN108889096B CN108889096B CN201810809779.XA CN201810809779A CN108889096B CN 108889096 B CN108889096 B CN 108889096B CN 201810809779 A CN201810809779 A CN 201810809779A CN 108889096 B CN108889096 B CN 108889096B
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- 238000005516 engineering process Methods 0.000 description 5
- 239000000779 smoke Substances 0.000 description 5
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
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- 230000023556 desulfurization Effects 0.000 description 2
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- 239000003546 flue gas Substances 0.000 description 2
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- 238000007254 oxidation reaction Methods 0.000 description 2
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- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/402—Dinitrogen oxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/404—Nitrogen oxides other than dinitrogen oxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/818—Employing electrical discharges or the generation of a plasma
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
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Abstract
The invention discloses a pulse corona discharge plasma power supply based on module superposition, which comprises a PWM full-bridge controller, a rectifying power storage module, a loop inductance L str, a magnetic compression switch L m1, a magnetic compression switch L m2, a sharpening capacitor C p and a Load, wherein the input ends of the boost transformer, the PWM full-bridge controller and the direct current power storage module are sequentially connected, the output end of the direct current power storage module is connected with one end of the loop inductance Ltr, the other end of the loop inductance L str is respectively connected with one end of the magnetic compression switch L m1 and one end of the sharpening capacitor Cp, the other end of the magnetic compression switch L m1 is respectively connected with one end of the magnetic compression switch L m2 and one end of the Load, and the other end of the sharpening capacitor C p, the other end of the magnetic compression switch L m2 and the other end of the Load are grounded. The invention solves the problems of low conversion efficiency and slow rising time of the traditional plasma power supply, ensures higher voltage conversion efficiency and faster rising time of output voltage, is beneficial to free electron acceleration in the reactor and has better effect of removing harmful gases by air purification.
Description
Technical Field
The invention belongs to the technical field of electronic circuits, and particularly relates to a pulse corona discharge plasma power supply based on module superposition.
Background
The pulse corona discharge technology is widely applied to desulfurization and denitrification of flue gas. The high-voltage pulse generated by a pulse power supply is applied to a reactor electrode, a strong electric field is generated between the reactor electrodes, part of smoke molecules are ionized under the action of the strong electric field, the ionized electrons are accelerated by the strong electric field to obtain energy which becomes high-energy electrons (5-20 eV), the high-energy electrons can activate, crack and ionize other smoke molecules to generate various active particles such as OH, O and HO2 and free radicals, SO2 and NO in the smoke are oxidized into higher-order oxides SO3 and NO2 by the active particles and the free radicals, H2SO4 and HNO3 are formed after meeting H2O in the smoke, aerosol of (NH 4) 2SO4/NH4NO3 is generated under the condition of NH3 or other neutral substances injection, the aerosol is collected by a dust collector, and the electric field generated by the pulse corona discharge smoke desulfurization and denitrification reaction has the dust removal function. The flue gas containing sulfur dioxide and nitrogen oxides generated in the industries of coal-fired power plants, chemical industry, metallurgy, building materials and the like can be purified in an environment-friendly way by adopting a pulse corona discharge technology, so that the atmospheric pollution is reduced.
Pulse corona discharge, interface discharge, dielectric barrier discharge and the like are mainly used in the discharge mode in the application of a pulse corona discharge technology, wherein a pulse corona discharge plasma power supply is used for pulse corona discharge, a pulse transformer is used for boosting a traditional pulse corona discharge plasma power supply, the pulse transformer is adopted, the index requirement is higher than that of a common power frequency transformer, and the iron core is commonly used as high-permeability ferroalloy or ferrite, so that the winding requirement is strict, and the cost of the pulse transformer in the power supply is high; in addition, the traditional pulse corona discharge plasma power supply is a multi-stage magnetic compression pulse power supply, a pulse power generator is internally provided with a plurality of magnetic compression loops, the circuit connection relation is complex, and the stability is poor, so that the voltage transformation ratio of a pulse transformer is large, the leakage inductance is large, and the resonance period of a first-stage resonance loop is long (about tens of us); this often requires the provision of 2-3 stages or even more magnetic compression loops containing magnetic switches in order to obtain a voltage pulse on the load with a rise time of about 100 ns. But the voltage loss per stage of the magnetic switch is about 10%, that is to say the voltage conversion rate is between 80% and 70%. In addition, the rising time of the low output voltage of the voltage conversion efficiency is relatively slow through a plurality of loops, and the rising time is slow, so that the speed of free electrons in a reactor adopting the power supply is slow, the generation speed and the reaction speed of oxidation free radicals are not facilitated, the efficiency of removing harmful gases is finally reduced, and the removal effect of the harmful gases is poor.
Therefore, the power supply circuit in the existing reactor still needs to be researched to improve the harmful gas removal effect and meet the environmental protection requirement.
Disclosure of Invention
The invention aims to solve the problems and provide a module superposition pulse corona discharge based plasma power supply.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
A pulsed corona discharge plasma power supply based on module superposition, comprising: the input ends of the step-up transformer, the PWM full-bridge controller and the direct-current power storage module are sequentially connected, the output end of the direct-current power storage module is connected with one end of the loop inductor Lstr, the other end of the loop inductor L str is respectively connected with one end of the magnetic compression switch L m1 and one end of the sharpening capacitor Cp, the other end of the magnetic compression switch L m1 is respectively connected with one end of the magnetic compression switch L m2 and one end of the Load, and the other end of the sharpening capacitor C p, the other end of the magnetic compression switch L m2 and the other end of the Load are all grounded. In the scheme, after the power grid voltage is boosted, the alternating current is converted into direct current by the rectifying power storage module and is stored in an element at the rear end of the circuit for use.
As a preferable technical scheme, the magnetic compression switch further comprises a resistor R P, and the other end of the magnetic compression switch Lm2 is grounded after being connected with the resistor R P.
As a preferable embodiment, the number of the rectifying power storage modules is 2 or more, and 2 or more rectifying power storage modules are connected in parallel.
As a preferable aspect, the rectifying and storing module includes:
The high-frequency transformer T1, fast rectifying tube, isolation buffer L t1, discharge capacitor C k1, IGBT switch S 1, high-frequency transformer T1 is connected with fast rectifying tube, fast rectifying tube 'S negative pole end with isolation buffer Lt1 one end is connected, discharge capacitor C k1 both ends respectively with the isolation buffer Lt1 other end the positive pole end of fast rectifying tube is connected, IGBT switch S 1' S one end with discharge capacitor C k1 one end is connected, IGBT switch S 1 'S the other end with the discharge capacitor C k1 other end return circuit inductance Ltr' S one end is connected respectively.
As a preferable technical scheme, the fast rectifying tube comprises 4 diodes, 2 diodes are connected in series to form two branches, and two coil heads of the high-frequency transformer T1 are connected with connection points between 2 diodes in the two branches.
As a preferable solution, the device further includes a diode D1, and the positive terminal and the negative terminal of the diode D1 are respectively connected with the other end of the discharge capacitor C k1 and the other end of the IGBT switch S 1.
As a preferable technical scheme, the fast rectifying tube further comprises a capacitor C m1, and two ends of the capacitor C m1 are respectively connected with two ends of the fast rectifying tube.
As a preferable embodiment, the rectifying and storing module further includes: and two ends of a circuit formed by connecting the resistor and the diode in series are respectively connected with two ends of the inductor L t1.
As a preferable technical solution, the step-up transformer adopts 380V:560V, boosting the ac 380V grid voltage to 560V.
As a preferable technical scheme, the PWM full-bridge controller comprises a rectifying module, an electric storage module, a direct-current bus capacitor C1 and an inversion module, wherein the rectifying module, the electric storage module, the direct-current bus capacitor C1 and the inversion module are sequentially connected.
According to the invention, a voltage module (rectifying and storing module) is adopted to combine with the magnetic switch, and a pulse transformer and a load (load capacitor) are not needed to be converted to a low-voltage side, so that the pulse rising time is greatly shortened, the conversion efficiency of a voltage peak value is improved to 90%, and the conversion efficiency of active power is improved by more than 15%.
Compared with the prior art, the invention has the beneficial effects that:
1. The power circuit structure is simpler and the cost is lower;
2. only 1-level magnetic switch compression is adopted, so that the voltage conversion efficiency is higher, the output voltage rising time is faster, and free electron acceleration in the reactor is facilitated; the 1-level magnetic switch is compressed, so that the voltage conversion efficiency is higher, the output voltage rising time is faster, free electrons in the reactor are accelerated, and the requirements of air pollution purification are met;
3. The number of the magnetic switches is reduced without adopting a traditional pulse transformer, transformer oil is not required to be cooled, and the method is better suitable for special engineering of indoor installation;
4. can be according to the demand, through the module stack, realize control of circuit speed and conversion efficiency for the circuit of different demands is changed more convenient and fast.
Drawings
Fig. 1 is a schematic diagram of a pulsed corona discharge plasma power supply based on module superposition in accordance with one embodiment.
Detailed Description
The technical scheme of the invention is further described and illustrated by the following specific examples, so that the technical scheme is more clear and obvious.
Unless otherwise indicated, all materials used in the examples of the present invention are those commonly used in the art, and all methods used in the examples are those commonly used in the art.
Example 1
As shown in fig. 1, this embodiment discloses a pulse corona discharge plasma power supply based on module superposition, which includes a step-up transformer, a PWM full-bridge controller, a rectifying power storage module, a loop inductance Lstr, a magnetic compression switch Lm1, a magnetic compression switch Lm2, a sharpening capacitor Cp, a Load, a resistor R P, the input ends of the step-up transformer, the PWM full-bridge controller, and the dc power storage module are sequentially connected, the output end of the dc power storage module is connected with one end of the loop inductance Lstr, the other end of the loop inductance Lstr is connected with one end of the magnetic compression switch Lm1 and one end of the sharpening capacitor Cp, the other end of the magnetic compression switch Lm1 is connected with one end of the magnetic compression switch Lm2 and one end of the Load respectively, the other end of the magnetic compression switch Lm2 is terminated with a resistor R P, one end of the sharpening capacitor Cp, the other end of the resistor R P, and the other end of the Load are all grounded.
One of the rectifying and storing modules is illustrated in the figure, and a preferable composition and connection relationship of the rectifying and storing module are specifically as follows: the high-frequency transformer T1 is connected with the fast rectifying tube, two ends of the fast rectifying tube are connected with two ends of the capacitor C m1, the positive end of the fast rectifying tube is further connected with one end of the inductor L t1, the other end of the inductor L t1 is connected with one end of the discharging capacitor C k1 and one end of the IGBT switch S 1, the other end of the discharging capacitor C k1 and the other end of the IGBT switch S 1 are respectively connected with the positive end and the negative end of the diode D1, and a node, connected with the negative end of the diode D1, of the other end of the IGBT switch S 1 is connected with one end of the loop inductor Lstr.
In this embodiment, a resistor and a diode may be additionally provided in the rectifying and storing module, where two ends of a circuit formed by connecting the resistor and the diode in series are connected to two ends of the inductor L t1 respectively.
The fast rectifying tube in this embodiment preferably adopts a structure arrangement of 4 diodes, the 2 diodes are connected in series to form two branches, and the two coil heads of the high-frequency transformer T1 are connected with the connection points between the 2 diodes in the two branches.
In this embodiment, 3 rectifying and storing modules are provided, which is only used for illustration, and in practical circuit application, the number of rectifying and storing modules may be adjusted according to the use requirement, and may be increased to a plurality, or may be 1 or 2.
The PWM full-bridge controller in the embodiment comprises a rectifying module, an electricity storage module, a direct current bus capacitor C1 and an inversion module, wherein the rectifying module, the electricity storage module, the direct current bus capacitor C1 and the inversion module are sequentially connected.
The working principle of the module superposition pulse corona discharge plasma power supply based on the embodiment is as follows:
(1) The 380V power grid voltage is boosted by a boosting transformer; and then, rectifying the alternating current electric energy into direct current voltage with any controllable amplitude through a PWM full-bridge controller. And then, the direct-current voltage is inverted into high-frequency square wave alternating-current voltage through a single-phase full bridge. The square wave alternating voltage is changed into a direct current power supply with stable amplitude again through a high-frequency transformer Ti and a fast rectifying tube. The direct current power supply is isolated by the buffer L t1 and is used for supplying power to the discharge capacitor C k1;
(2) The discharging capacitor C k1 is discharged through the IGBT switch S 1 to form a resonant loop with the loop inductor L str, and meanwhile, the voltage at two ends of the capacitor C k1 is quickly transferred to the sharpening capacitor C p. With the rapid rise of the voltage at the terminal C p, the magnetic switch L m1 is saturated rapidly, the inductance of the magnetic switch drops to zero rapidly, and at this time, the voltage at the two terminals of C p is transferred to the Load capacitor Load. At the Load voltage peak, the magnetic switch L m2 is turned on and no function is released through R P.
The invention provides a topological structure of a pulse voltage generator circuit based on module superposition. Conventional plasma power supplies are boosted by pulse transformers. The pulse transformer has large transformation ratio, so that leakage inductance is large, and the resonance period of the first-stage resonance circuit is long (about tens of us); this often requires 2-3 stages of magnetic switch compression in order to obtain a voltage pulse on the load with a rise time of about 100 ns; but the voltage loss per stage of the magnetic switch is about 10%, that is to say the voltage conversion rate is between 80% and 70%. The invention does not adopt the traditional pulse transformer, but adopts the common step-up transformer to realize step-up, only needs 1-level magnetic switch compression, has higher voltage conversion efficiency and faster rise time of output voltage, and is beneficial to free electron acceleration in the reactor. The larger the kinetic energy obtained by the free electrons is, the more the oxidation free radicals are generated in the reactor, and the better the removal effect of harmful gases is.
The invention adopts Cp sharpening capacitor technology. For pulse voltage generators above 100kV, the series lead inductance between the modules is large (about several tens uH). If the capacitor is not sharpened, the magnetic switch is directly adopted for compression, the pulse rising time is very large (about several us levels), and the 100ns rising edge technical requirement cannot be met. If a sharpening capacitor is added, the resonance period in the first-stage resonant circuit is smaller than 1us, which is equivalent to adding a first-stage magnetic compression switch, so that the voltage volt-seconds applied to the magnetic switch Lm1 is reduced in multiple, and the rising time of the Load is prolonged.
The invention adopts the technology of high-frequency electromagnetic switches Lm1 and Lm 2. The working frequency of the traditional plasma power supply is only 400Hz, and a nanocrystalline magnet with high rectangular ratio is mostly adopted as a magnetic switch. Based on the module superposition technical scheme, the pulse repetition frequency is increased to more than 2000 Hz. In order to reduce the heating value of the magnetic switch, the invention adopts a manganese-zinc magnet to develop a magnetic compression switch.
The above description is not intended to limit the scope of the application, but is intended to cover modifications and improvements made by those skilled in the art in light of the present teachings. In particular, many variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will be apparent to those skilled in the art.
Claims (7)
1. A pulsed corona discharge plasma power supply based on module superposition, comprising: the device comprises a step-up transformer, a PWM full-bridge controller, a rectification power storage module, a loop inductance L str, a magnetic compression switch L m1, a sharpening capacitor C m2, a Load, wherein the step-up transformer, the PWM full-bridge controller and the rectification power storage module are sequentially connected, the output end of the rectification power storage module is connected with one end of the loop inductance L str, the other end of the loop inductance L str is respectively connected with one end of the magnetic compression switch L m1 and one end of the sharpening capacitor C p, the other end of the magnetic compression switch L m1 is respectively connected with one end of the magnetic compression switch L m2 and one end of the sharpening capacitor C p, the other end of the magnetic compression switch L m2 and the other end of the Load;
The magnetic compression switch is characterized by further comprising a resistor R p, wherein the other end of the magnetic compression switch L m2 is connected with the resistor R p and then grounded;
the number of the rectifying power storage modules is more than 2, and the more than 2 rectifying power storage modules are connected in parallel;
The rectifying and storing module includes:
the high-frequency transformer T1, quick rectifying tube, isolation buffer L t1, discharge capacitor C k1, IGBT switch S 1, high-frequency transformer T1 is connected with quick rectifying tube, quick rectifying tube 'S negative pole end with isolation buffer L t1 one end is connected, discharge capacitor C k1 both ends respectively with the isolation buffer L t1 other end the positive pole end of quick rectifying tube is connected, IGBT switch S 1' S one end with discharge capacitor C k1 one end is connected, IGBT switch S 1 'S the other end with the discharge capacitor C k1 other end return circuit inductance L str' S one end is connected respectively.
2. A pulsed corona discharge plasma power supply based on modular superposition according to claim 1, characterized in that said fast rectifying tube comprises 4 diodes, each 2 diodes being connected in series, forming two branches, the two coil heads of said high frequency transformer T1 being connected to the connection point between 2 diodes in the two branches.
3. A pulsed corona discharge plasma power supply based on module superposition according to claim 1 or 2, further comprising a diode D1, the positive and negative terminals of said diode D1 being connected to the other terminal of said discharge capacitor C k1 and the other terminal of said IGBT switch S 1, respectively.
4. A pulsed corona discharge plasma power supply based on modular superposition according to claim 1 or 2, further comprising a capacitor C m1, the two ends of said capacitor C m1 being connected to the two ends of said fast rectifying tube, respectively.
5. A pulsed corona discharge plasma power supply based on modular superposition according to claim 1 or 2, wherein said rectified power storage module further comprises: and two ends of a circuit formed by connecting the resistor and the diode in series are respectively connected with two ends of the inductor L t1.
6. A pulsed corona discharge plasma power supply based on modular superposition according to claim 1, wherein said step-up transformer employs 380V:560V.
7. The pulse corona discharge plasma power supply based on module superposition according to claim 1, wherein the PWM full-bridge controller comprises a rectifying module, an electric storage module, a dc bus capacitor C1 and an inversion module, and the rectifying module, the electric storage module, the dc bus capacitor C1 and the inversion module are sequentially connected.
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| WO2021115101A1 (en) * | 2019-12-13 | 2021-06-17 | 浙江大维高新技术股份有限公司 | Medium-high voltage bidirectional all-solid-state direct-current circuit breaker and high-potential energy supply apparatus thereof |
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| CN101534071A (en) * | 2009-04-09 | 2009-09-16 | 复旦大学 | All solid state high voltage nanosecond pulse power supply |
| CN105553322A (en) * | 2015-12-11 | 2016-05-04 | 浙江大维高新技术股份有限公司 | Power source device for plasma generation |
| CN208786118U (en) * | 2018-07-23 | 2019-04-26 | 浙江大维高新技术股份有限公司 | Corona discharge pulse plasma electrical source based on module superposition |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101534071A (en) * | 2009-04-09 | 2009-09-16 | 复旦大学 | All solid state high voltage nanosecond pulse power supply |
| CN105553322A (en) * | 2015-12-11 | 2016-05-04 | 浙江大维高新技术股份有限公司 | Power source device for plasma generation |
| CN208786118U (en) * | 2018-07-23 | 2019-04-26 | 浙江大维高新技术股份有限公司 | Corona discharge pulse plasma electrical source based on module superposition |
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