CN102299517A - Industrial harmonic-eliminating filtering energy-saving device and method - Google Patents
Industrial harmonic-eliminating filtering energy-saving device and method Download PDFInfo
- Publication number
- CN102299517A CN102299517A CN2011102687170A CN201110268717A CN102299517A CN 102299517 A CN102299517 A CN 102299517A CN 2011102687170 A CN2011102687170 A CN 2011102687170A CN 201110268717 A CN201110268717 A CN 201110268717A CN 102299517 A CN102299517 A CN 102299517A
- Authority
- CN
- China
- Prior art keywords
- circuit
- harmonic
- energy
- industrial
- accumulator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to an industrial harmonic-eliminating filtering energy-saving device and an industrial harmonic-eliminating filtering energy-saving method. The device comprises a harmonic and surge absorbing and rectifying circuit, an energy storage circuit, an inversion circuit, a power grid voltage phase and a frequency tracking circuit. Harmonic and surge signals and the like in a power grid are taken out and rectified by the rectifying circuit, and the rectified signals are sent to the energy storage circuit, namely the energy storage circuit is charged; the rectifying circuit and the energy storage circuit absorb the harmonic and surge signals and the like generated by industrial electric equipment on the power grid in the energy storage circuit; and when the energy storage circuit is saturated, the inversion circuit releases saturated energy in the energy storage circuit, is needed to track the frequency and phase of power grid voltage when releasing the energy, and releases energy under the conditions of the same frequency and the same phase, so that the industrial harmonic-eliminating filtering energy-saving device can eliminate harmonic and fulfill the aim of saving energy.
Description
Technical field
The invention belongs to the power grid control equipment in the electrotechnics, particularly relate to the energy-conservation devices and methods therefor of a kind of industrial harmonic elimination filtering.
Background technology
Electric energy is the most widely used energy of modern society, and development of modern industry has been brought the contradiction between decline of the electrical network quality of power supply and the high-quality power requirement.On the one hand, because the popularization of power-saving technology and automatic technology, the access of nonlinear disturbance loads such as various power electronic equipments is increasing, the demand of electric energy is increased day by day, and inevitably the higher harmonic current that produces is injected electrical network in a large number, caused such as phenomenons such as grid voltage waveform distortion, voltage flicker, interference, caused the quality of power supply to worsen day by day; On the other hand, because the needs of Development of Power Electronic Technology, sensitive load equipment such as various chip manufacturings, precise machining equipment such as frequency-changing speed-regulating driver, robot, automatic assembly line, Programmable Logic Controller, computer information system have not only proposed more strict requirement to power supply qualitys such as supply power voltage interruption, flickering and harmonic contents, and very responsive to the fluctuation and the external interference of power supply.The deterioration of any power supply quality all may cause the decline of product quality, causes great economic loss, and thus, electric harmonic becomes the subject matter of the quality of power supply.Mains by harmonics is mainly produced by nonlinear-load.Electric current and the non-linear relation of terminal voltage that nonlinear-load absorbs, the wave distortion of electric current generation as a result and cause the terminal voltage wave distortion.This periodic distorted waveform can be launched into the Fourier series form by fundamental frequency (50Hz), and its component greater than fundamental frequency is harmonic wave.Harmonic pollution is serious to the harm of electric power system and power consumption equipment, mainly show following several aspect: load of utility 1, increases electric power, reduce the system power factor, reduce the available capacity and the efficient of generating, transmission of electricity and power consumption equipment, cause equipment waste, circuit waste and energy loss; 2, cause that compensation capacitors resonance and harmonic current amplify, cause the capacitor group to damage maybe and can't put into operation because of overcurrent or overvoltage; 3, produce pulsating torque and cause motor vibration, influence product quality and electrical machinery life; 4, because eddy current and kelvin effect make motor, transformer, transmission line etc. produce the secondary power loss and overheated, the waste electric energy also quickens ageing of insulation; 5, harmonic voltage has strengthened the electric field strength of dielectric with the form that is proportional to its crest voltage, reduces service life of equipment; 6,3 multiple subharmonic current can cause the center line overload of three-phase four wire system, and produces circulation in the Transformer Winding of delta connection, makes the winding current overrate, when serious even accidents caused.
Every device of having the ability to carry out signal processing can be called filter.In modern age telecommunication apparatus and all kinds of control system, filter applies is very extensive; In all electronic units, use at most, what technology was the most complicated will calculate filter.The quality of the good and bad directly decision product of filter, so, the research and the production of filter are always paid attention to by various countries.The U.S. in 1917 and Germany scientist have been invented the LC filter respectively, and next year has caused the appearance of first multiplex system of the U.S..The 1950's, passive filter reached its maturity.Development from the sixties owing to computer technology, integrated technique and material industry, the filter development steps on a new stage, and towards low-power consumption, high accuracy, small size, multi-functional, reliable and stable and inexpensive direction effort, wherein small size, multi-functional, high accuracy, the reliable and stable main direction that becomes after the seventies.Cause the develop rapidly of various filters such as RC active filter, digital filter, switching capacity filter and transchanger, to the later stage seventies, the monolithic of above-mentioned several filters is integrated to be developed out and to be applied.The eighties, be devoted to the research of all kinds of new mode filters, make great efforts to improve performance and enlarge range of application gradually.The nineties is to now mainly being devoted to exploitation and the development of all kinds of filter applies in various product.Certainly, the research of filter itself is still constantly being carried out.The kind of the existing filter of China and the frequency that is covered satisfy existing various telecommunication apparatus basically.As a whole, China's active filter development is slower than passive filter, a large amount of as yet production and application.From the following production application ratio applicable cases of all kinds of filters of China as can be seen: the LC filter accounts for 50%; Crystal filter accounts for 20%; Mechanical filter accounts for 15%; Pottery and SAW (Surface Acoustic Wave) filter respectively account for 1%; All the other all kinds of filters account for 13% altogether.From these application percentages, China's electronic product wants to realize integrated on a large scale, the integrated important topic that remains of filter.Along with the development of electronics industry, more and more higher to the performance requirement of filter, function is also more and more, and requires them to develop to integrated direction.China's filter development and production and above-mentioned requirements differ greatly, for shortening this gap, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, and the utilization of cooperation scientific principle, actively studied innovation, in the hope of founding a kind of industrial harmonic elimination filtering energy saver of new structure, can improve general existing industrial harmonic elimination filtering energy saver, make it have more practicality.Through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.
Summary of the invention
Main purpose of the present invention is that overcome existing filter and have following defective: the traditional passive filter is harmonic carcellation effectively, but harmonic energy is not fully used; The tradition active filter eliminates harmonic wave by reverse injection energy, harmonic carcellation effectively, but need the outside that energy is provided, and loss own is bigger, the invention provides a kind of industrial harmonic elimination filtering energy saver of new structure, and technical problem to be solved is not only to make it have the harmonic carcellation function, but also have harmonic energy is made full use of function, have obvious energy-saving effect, thus more suitable, and have value on the industry.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, in order to reach aforementioned goal of the invention, major technique of the present invention thes contents are as follows:
A kind of industrial harmonic elimination filtering energy saver comprises:
Harmonic wave, surge absorb rectification circuit, are used for signals such as the harmonic wave of electrical network and surge are taken out, and carry out rectification;
Accumulator is used to store the electric energy after harmonic wave and surge absorb the rectification circuit rectification;
Inverter circuit is used for the electric energy that accumulator is saturated and discharges;
Electric network voltage phase, frequency tracking circuit, the frequency and the phase place that are used to follow the tracks of line voltage reach the electric energy in the accumulator and line voltage frequency, same-phase together, thereby electric energy saturated in the accumulator are discharged by inverter circuit.
A kind of industrial harmonic elimination filtering power-economizing method, its step is as follows:
(1), absorbing rectification circuit by harmonic wave, surge takes out harmonic wave and surge from electrical network;
(2), by storing into after the rectification in the accumulator;
(3), by electric network voltage phase, frequency tracking circuit, with the electric energy in the accumulator, by inverter circuit with frequently, homophase is discharged in the electrical network.
Aforesaid accumulator adopts capacitance energy storage,
Aforesaid electric network voltage phase, frequency tracking circuit comprise voltage signal acquisition circuit, microprocessor, drive circuit; Microprocessor is handled the electric energy in the accumulator by the information of voltage signal acquisition circuit, reaches and line voltage frequency, same-phase together, sends to drive circuit then.
The working power of aforesaid microprocessor is an accumulator.
Aforesaid inverter circuit comprises H bridge circuit, output filter circuit, and the H bridge circuit is used for receiving the electric energy of electric network voltage phase, frequency tracking circuit drive circuit, is discharged in the electrical network by output filter circuit.
The working power of aforesaid H bridge circuit is an accumulator.
The aforesaid industrial harmonic elimination filtering energy saver scope of application is 30-300KW, voltage 220-380VAC industrial electricity apparatus.
By technique scheme, the present invention has following advantage at least:
1, utilize accumulator that the harmonic wave that industrial electricity apparatus produces is absorbed in the accumulator.
2, when accumulator reaches capacity, give off energy, be that harmonic carcellation reaches energy-conservation dual purpose again like this.
3, traditional passive filter harmonic carcellation effectively, but harmonic energy is not fully used; The tradition active filter is by reverse injection energy harmonic wave to be eliminated, harmonic carcellation effectively, but need the outside that energy is provided, and loss own is bigger, the invention provides a kind of industrial harmonic elimination filtering energy saver of new structure, and technical problem to be solved is not only to make it have the harmonic carcellation function, but also have harmonic energy is made full use of function, have obvious energy-saving effect, thus more suitable, and have value on the industry.
4, the present invention is energy-conservation from optimizing approach such as design of electrical motor industry, reasonable selection, technological transformation, and its successful development will be filled up the technological gap of domestic electron trade.And this product large scale investment is produced, and can bring more job opportunity, promotes local expanding economy, has good economic benefit and social benefit.
In sum, the present invention has above-mentioned many advantages and practical value, and in like product, do not see have similar structural design to publish or use and really genus innovation, no matter it structurally or bigger improvement is all arranged on the function, is had large improvement technically, and has produced handy and practical effect, and more existing filter has the multinomial effect of enhancement, thereby being suitable for practicality more, and having the extensive value of industry, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, below with preferred embodiment of the present invention and conjunction with figs. describe in detail as after.
The specific embodiment of the present invention is provided in detail by following examples and accompanying drawing thereof.
Description of drawings
Fig. 1 is a principle assumption diagram of the present invention;
Fig. 2 is electric network voltage phase, frequency tracking circuit principle assumption diagram;
Fig. 3 is an electrical network inverter circuit principle assumption diagram.
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to industrial its embodiment of harmonic elimination filtering energy saver, structure, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
As shown in Figure 1, a kind of industrial harmonic elimination filtering energy saver comprises:
Harmonic wave, surge absorb rectification circuit, are used for signals such as the harmonic wave of electrical network and surge are taken out, and carry out rectification;
Accumulator is used to store the electric energy after harmonic wave and surge absorb the rectification circuit rectification;
Inverter circuit is used for the electric energy that accumulator is saturated and discharges;
Electric network voltage phase, frequency tracking circuit, the frequency and the phase place that are used to follow the tracks of line voltage reach the electric energy in the accumulator and line voltage frequency, same-phase together, thereby electric energy saturated in the accumulator are discharged by inverter circuit.
Aforesaid accumulator adopts capacitance energy storage.
As shown in Figure 2, aforesaid electric network voltage phase, frequency tracking circuit comprise voltage signal acquisition circuit, microprocessor, drive circuit; Microprocessor is handled the electric energy in the accumulator by the information of voltage signal acquisition circuit, reaches and line voltage frequency, same-phase together, sends to drive circuit then.The working power of aforesaid microprocessor is an accumulator.
As shown in Figure 3, aforesaid inverter circuit comprises H bridge circuit, output filter circuit, and the H bridge circuit is used for receiving the electric energy of electric network voltage phase, frequency tracking circuit drive circuit, is discharged in the electrical network by output filter circuit.The working power of aforesaid H bridge circuit is an accumulator.
The aforesaid industrial harmonic elimination filtering energy saver scope of application is 30-300KW, voltage 220-380VAC industrial electricity apparatus.
As shown in Figure 1, a kind of industrial harmonic elimination filtering power-economizing method, its step is as follows:
(1), absorbing rectification circuit by harmonic wave, surge takes out harmonic wave and surge from electrical network;
(2), by storing into after the rectification in the accumulator;
(3), by electric network voltage phase, frequency tracking circuit, with the electric energy in the accumulator, by inverter circuit with frequently, homophase is discharged in the electrical network.
The technological innovation of the present invention that above-mentioned structure like this constitutes all has many saving graces for technical staff of the same trade now, and the progressive that possesses skills really.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (8)
1. industrial harmonic elimination filtering energy saver is characterized in that comprising:
Harmonic wave, surge absorb rectification circuit, are used for signals such as the harmonic wave of electrical network and surge are taken out, and carry out rectification;
Accumulator is used to store the electric energy after harmonic wave and surge absorb the rectification circuit rectification;
Inverter circuit is used for the electric energy that accumulator is saturated and discharges;
Electric network voltage phase, frequency tracking circuit, the frequency and the phase place that are used to follow the tracks of line voltage reach the electric energy in the accumulator and line voltage frequency, same-phase together, thereby electric energy saturated in the accumulator are discharged by inverter circuit.
2. industrial harmonic elimination filtering power-economizing method, its step is as follows:
(1), absorbing rectification circuit by harmonic wave, surge takes out harmonic wave and surge from electrical network;
(2), by storing into after the rectification in the accumulator;
(3), by electric network voltage phase, frequency tracking circuit, with the electric energy in the accumulator, by inverter circuit with frequently, homophase is discharged in the electrical network.
3. industrial harmonic elimination filtering energy saver according to claim 1 is characterized in that wherein said accumulator adopts capacitance energy storage.
4. industrial harmonic elimination filtering energy saver according to claim 1 is characterized in that described electric network voltage phase, frequency tracking circuit comprise voltage signal acquisition circuit, microprocessor, drive circuit; Microprocessor is handled the electric energy in the accumulator by the information of voltage signal acquisition circuit, reaches and line voltage frequency, same-phase together, sends to drive circuit then.
5. industrial harmonic elimination filtering energy saver according to claim 3, the working power that it is characterized in that described microprocessor is an accumulator.
6. industrial harmonic elimination filtering energy saver according to claim 1, it is characterized in that described inverter circuit comprises H bridge circuit, output filter circuit, the H bridge circuit is used for receiving the electric energy of electric network voltage phase, frequency tracking circuit drive circuit, is discharged in the electrical network by output filter circuit.
7. industrial harmonic elimination filtering energy saver according to claim 5, the working power that it is characterized in that described H bridge circuit is an accumulator.
8. industrial harmonic elimination filtering energy saver according to claim 1 is characterized in that the described industrial harmonic elimination filtering energy saver scope of application is 30-300KW, voltage 220-380VAC industrial electricity apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102687170A CN102299517B (en) | 2011-09-13 | 2011-09-13 | Industrial harmonic-eliminating filtering energy-saving device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102687170A CN102299517B (en) | 2011-09-13 | 2011-09-13 | Industrial harmonic-eliminating filtering energy-saving device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102299517A true CN102299517A (en) | 2011-12-28 |
| CN102299517B CN102299517B (en) | 2013-04-24 |
Family
ID=45359761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102687170A Active CN102299517B (en) | 2011-09-13 | 2011-09-13 | Industrial harmonic-eliminating filtering energy-saving device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102299517B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104617912A (en) * | 2015-01-07 | 2015-05-13 | 胡文杰 | Filtering system on direct-current or alternating-current signal transmission circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5351180A (en) * | 1992-10-30 | 1994-09-27 | Electric Power Research Institute, Inc. | Highly fault tolerant active power line conditioner |
| CN2527016Y (en) * | 2002-01-11 | 2002-12-18 | 张玉良 | Hybrid reactive power generator |
| CN1832289A (en) * | 2006-03-24 | 2006-09-13 | 武汉大学 | Neutral harmonic current managing device and control method thereof |
| CN101604844A (en) * | 2009-07-06 | 2009-12-16 | 山东雷奇电器有限公司 | A kind of frequency converter for eliminating harmonic waves |
| CN201398174Y (en) * | 2009-03-31 | 2010-02-03 | 杭州金兰达科技有限公司 | Power saving device special for asynchronous motor |
-
2011
- 2011-09-13 CN CN2011102687170A patent/CN102299517B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5351180A (en) * | 1992-10-30 | 1994-09-27 | Electric Power Research Institute, Inc. | Highly fault tolerant active power line conditioner |
| CN2527016Y (en) * | 2002-01-11 | 2002-12-18 | 张玉良 | Hybrid reactive power generator |
| CN1832289A (en) * | 2006-03-24 | 2006-09-13 | 武汉大学 | Neutral harmonic current managing device and control method thereof |
| CN201398174Y (en) * | 2009-03-31 | 2010-02-03 | 杭州金兰达科技有限公司 | Power saving device special for asynchronous motor |
| CN101604844A (en) * | 2009-07-06 | 2009-12-16 | 山东雷奇电器有限公司 | A kind of frequency converter for eliminating harmonic waves |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104617912A (en) * | 2015-01-07 | 2015-05-13 | 胡文杰 | Filtering system on direct-current or alternating-current signal transmission circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102299517B (en) | 2013-04-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101340099B (en) | Super capacitor and accumulator hybrid energy-storing series type dynamic voltage restorer | |
| CN201290010Y (en) | Cascade dynamic voltage recovery device | |
| CN204706889U (en) | Low-voltage dynamic filtering bucking-out system | |
| CN204633344U (en) | A kind of Research on Unified Power Quality Conditioner with uninterrupted power supply function | |
| CN201430444Y (en) | Compensation device | |
| CN102299517B (en) | Industrial harmonic-eliminating filtering energy-saving device and method | |
| CN202167852U (en) | Passive filtering device with adjustable inductance parameters | |
| CN204012712U (en) | Power quality controlling and energy storage integrated energy saver | |
| CN203026945U (en) | Energy-saving device for absorbing harmonic waves in power grid | |
| CN204068268U (en) | A kind of dynamic active filtering compensation device | |
| CN203406617U (en) | Dynamic reactive power compensation apparatus capable of compensating each phase respectively | |
| CN106849128A (en) | The power compensating system of diesel generating set | |
| CN202474859U (en) | Passive power filter circuit used for industrial electrical equipment | |
| CN201523236U (en) | Power quality comprehensive controller for power distribution system | |
| CN204928130U (en) | Take timesharing and deposit high -pressure active power filter device of ability | |
| CN106374470A (en) | High-voltage active filtering apparatus with time-sharing energy storage | |
| CN201075691Y (en) | Combining frequency conversion type electricity saver | |
| CN104166418B (en) | A kind of control method of hypervelocity energy-saving alternating current stable-pressure device | |
| CN204009642U (en) | A kind of hypervelocity energy-saving alternating current stable-pressure device | |
| CN203406618U (en) | Dynamic reactive power compensation apparatus capable of compensating three phases together | |
| CN204835528U (en) | Synthesize main circuit topology of electric energy quality regulator | |
| CN204089192U (en) | Based on the Research on Unified Power Quality Conditioner of thyristor and energy storage | |
| CN202651805U (en) | Static reactive generator based on DSP | |
| CN203632257U (en) | An SVG active dynamic reactive harmonic wave compensation apparatus | |
| CN220291677U (en) | Electric energy quality adjusting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SICHUAN DEFENG ELECTRIC CO., LTD. Free format text: FORMER OWNER: CHANGZHOU CAMPUS, HOHAI UNIVERSITY Effective date: 20131008 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 213022 CHANGZHOU, JIANGSU PROVINCE TO: 638402 GUANG AN, SICHUAN PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20131008 Address after: County Economic Development Zone Industrial Park of Guang'an City, Sichuan Province, wusheng County 638402 Patentee after: SICHUAN DEFENG ELECTRIC CO.,LTD. Address before: 213022 Jiangsu, North District, Changzhou Jin Ling North Road, No. 200 Patentee before: CHANGZHOU CAMPUS OF HOHAI University |