CN1132298C - Triphase single-switch power factor correcting step-up converter - Google Patents
Triphase single-switch power factor correcting step-up converter Download PDFInfo
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- CN1132298C CN1132298C CN00136053A CN00136053A CN1132298C CN 1132298 C CN1132298 C CN 1132298C CN 00136053 A CN00136053 A CN 00136053A CN 00136053 A CN00136053 A CN 00136053A CN 1132298 C CN1132298 C CN 1132298C
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- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input voltage
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- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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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
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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- Dc-Dc Converters (AREA)
Abstract
The present invention discloses a booster converter with three-phase single-switching power factor correction, which comprises a three-phase input end, an output end, a three-phase rectification circuit, a pulse width modulation circuit, a voltage loop and a current loop. The positive phase input end of the current loop is connected with the output of the voltage loop, and the reverse phase input end is connected with the output end of a current sampling circuit. The output end of the current loop is connected with the positive phase input end of the pulse width modulation circuit. As long as the current parameters satisfy certain condition, the input power range satisfying the harmonic standards of an IEC1000-3-2A grade can be greatly improved.
Description
The present invention relates to a kind of triphase single-switch rectifier converter that has circuit of power factor correction, particularly adopt (Boost) converter that boosts of discontinuous mode (DCM), it is commonly referred to as triphase single-switch DCM Boost converter.
Triphase single-switch DCM Boost converter is [referring to document 1:A.R.Prasad, P.D.Ziogas, and S.Manias, " An Active Power Factor Correction Technique for Three-Phase Diode Rectifiers ", IEEE Power Electronic Specialists Conf. (PESC) Record, pp.58-66,1989.] be a kind of approximate circuit of power factor correction (PFC).With other three-phase pfc circuit relatively, it have simple in structure, control is convenient, the Boost diode does not have advantages such as reverse-recovery problems.Adopt the fixed frequency of tradition to decide this pfc circuit of duty ratio, the maximal input that satisfies IEC-1000-3-2 A level harmonic standard approximately is 5kW.Thereby,, can reach IEC-1000-3-2 A level harmonic standard again for keeping this pfc circuit advantage of simple structure for the power supply module for communication of bigger input power, best approach is revised control strategy, the modulation duty cycle function exactly.
In recent years, more existing improved fixed controlling schemes frequently are suggested in succession, they can be divided into two big classes: the first kind is to inject by high order harmonic component to modulate the control duty ratio: the typical control technology is that 6 subharmonic inject control [referring to document 2:Q.Huang and F.C.Lee, " Harmonic Reduction in A Single-Switch; Three-Phase Boost Retifier with HighOrder Harmonic Injected PWM ", IEEE Power Electronics Specialists Conf. (PESC) Record, pp.1266-1271,1996. and document 3:Qihong Huang; " Harmonic ReductionIn A Single-Switch Three Phase Boost Rectifer With Harmonic-Injected PWM, Thesis submitted to the Faculty of the Virginia Polytechnic Institute and StateUniversity in Partial fulfillment of the requirements for the degree Master ofScience in Electrical Engineering, February 4,1997, Blacksburg, Virgina.]; The 6n subharmonic injects control [referring to document 4:Yangtack Jang, and Milan M.Jovanovi é, " Robust; Harmonic Injection Method for Single-Switch; Three Phase; Discontinuous-Conduction-Mode Boost Rectifiers. " United States Patent 5847944, Dec 18,1998] and peak current inject control [referring to document 5: the patent No. is 99121240.1 and is called the Chinese patent application of " three-phase rectifier that has circuit of power factor correction "] etc.; Second class be a kind of Average Current Control technology [document 6: referring to application number be 99104662.5, name is called " single-switch triphase power factor correcting method and circuit "].After adopting these improved control strategies, can reduce 5 times, 7 inferior harmonic contents greatly, thereby guarantee under the constant situation of main circuit structure, to increase the maximal input that satisfies the IEC-1000-3-2 standard.Although these control strategies can both be realized reducing of current harmonic content effectively, shortcoming is arranged respectively.Wherein preceding two kinds [the aforementioned documents 2-4] in the first kind will produce harmonic wave injection signal with the testing circuit of complexity; Back a kind of [document 5] though very simple testing circuit is arranged, but still with preceding two kinds the same, the less stable of large-signal.Second class [document 6] then is to promote single-phase CCM average current PFC control technology, and its testing circuit and control are very complicated.
Prior art also proposed a kind of employing Current-Clamped (current clamp) [referring to document 7:R.Rdel, B.P.Erisman, " Low-Cost Power-Factor Correction/Line-Harmonics Reduction with Current-ClampedBoost converter; ＂ HFPC ＇ 95; pp261-269. and document 8:R.Rdel; A.S.Kislovski; B.P.Erisman; " Input-Current-Clamping:AnInexpensive Novel Control, Technique to Achieve Compliance with HarmonicRegulations ＂ .IEEE APEC ＇ 96, pp145-151] control CCM single phase boost pfc circuit, it adopts traditional average current type current control and two kinds of technology of peak electricity flow pattern control, has realized that quite simply 1KW is with the interior single-phase high power factor correction requirement of satisfying IEC 1000-3-2 A level harmonic standard.But obviously be not enough with interior meeting the demands only at 1KW.
Purpose of the present invention is exactly in order to overcome the above problems, a kind of triphase single-switch power factor correcting step-up converter is provided, can improve Harmonics of Input, make it still can satisfy the IEC-1000-3-2 standard, make circuit simpler again in more powerful application scenario.
The present invention realizes that the scheme of above-mentioned purpose is: a kind of triphase single-switch power factor correcting step-up converter, comprise three-phase input end, output, rectified three-phase circuit, pulse-width modulation circuit and Voltage loop, described three-phase input end connects three-phase alternating-current supply respectively, output is output as direct current, electronic switch of output two ends cross-over connection at rectification circuit, the control end of this electronic switch links to each other with the output of pulse-width modulation circuit, the inverting input of this pulse-width modulation circuit PWM links to each other with outside input triangular signal, at forward switching diode of rectification circuit DC side anode serial connection; The sampling of input termination output voltage and the reference voltage of Voltage loop; It is characterized in that: also comprise electric current loop, the normal phase input end of described electric current loop directly or by multiplier connects the output of Voltage loop, and inverting input connects the output of current sampling circuit, and the output of electric current loop then is connected to the normal phase input end of pulse-width modulation circuit; The waveform voltage output of described multiplier links to each other with a fixing voltage signal with the effective value input, and what link to each other with the output of Voltage loop then is signal input part.
Owing to adopted above scheme, average current clamp control technology is applied to triphase single-switch DCM Boost circuit and, has kept the characteristics of the low harmonic wave of this circuit high power factor correction through modification and comprehensive, improved power bracket.In this scheme, (bandwidth is far below the net frequency, and output generally＜10Hz) is the benchmark of current inner loop (fast ring, general＞1/10fs, fs is a switching frequency) for Voltage loop.The result of control is that the electric current of artificail commutation bridge DC side becomes direct current, thereby can make each phase inductance electric current in the half period, all have the time (corresponding to the interval of phase voltage 60 degree-120 degree) of 60 degree to be direct current, total phase current is approximately trapezoidal wave, so can increase the maximum power that satisfies the IEC-1000-3-2A harmonic standard.Experiment has also proved this point.On the other hand, compare with other processing modes, circuit has been simplified again greatly.
Fig. 1 is the available technology adopting principle schematic of the triphase single-switch DCM Boost converter of frequency control surely.
Fig. 2 is the another kind of modified model triphase single-switch of a prior art DCM BOOST pfc circuit schematic diagram.
Fig. 3 is one of modified model three-phase DCM BOOST pfc circuit schematic diagram of proposing of the present invention.
Fig. 4 is two of the modified model three-phase DCM BOOST pfc circuit schematic diagram that proposes of the present invention.
Fig. 5 is the schematic diagram (M=1.4) of Fig. 1 PFC input phase current.
Fig. 6 is the schematic diagram (M=1.4) of Fig. 3 PFC input phase current.
Fig. 7 is schematic diagram (M=1.4) schematic diagram of Fig. 4 PFC input phase current.
Also the present invention is described in further detail in conjunction with the accompanying drawings below by specific embodiment.
The present invention is by detecting the current signal of triphase single-switch DCM Boost converter DC side, constitute an electric current loop (interior ring) amplifier with the output of Voltage loop (outer shroud), the output of electric current loop relatively produces required duty cycle of switching with the external subcarrier signal again, to realize high-quality input current waveform, improve the input power range that satisfies IEC 1000-3-2 A level harmonic standard.The inventive circuit control structure is similar to traditional average current type current control technology, so be called the Average Current Control scheme here.But this realization that is controlled in the triphase single-switch DCM BOOST converter still belongs to the first time.
Fig. 1 is the triphase single-switch DCM Boost converter block diagram that available technology adopting is controlled surely frequently, it is a traditional voltage-type control, as the bandwidth of design voltage ring well below the frequency of electrical network (＜10Hz), then the electrical network of duty cycle of switching after rectification in the cycle (300Hz) can regard constant as, the maximum power that the simplest this three-phase PFC technology can satisfy the IEC-1000-3-2A harmonic standard is 5KW.
Fig. 2 is a kind of modified model three-phase PFC block diagram of the prior art, it by 6 times of the input line voltage of output superposition of Voltage loop or 6n rd harmonic signal with the modulation switch duty ratio, making it at electrical network is not that constant---the effect of modulation is near the phase voltage peak value in the cycle, suitably increases duty ratio; And near 60 degree and 120 degree, suitably reduce duty ratio, make the input phase current more near sinusoidal, thereby increase the maximum power that satisfies the IEC-1000-3-2A harmonic standard.But the shortcoming that all has the large-signal less stable, wherein [document 2-4] also will produce harmonic wave injection signal with the testing circuit of complexity.
Prior art also has another kind of modified model three-phase PFC, it has identical principle with the Average Current Control of single-phase CCM BOOSTPFC, also use the UC3854 chip, just the current signal that detects is the electric current of rectifier bridge DC side, non-each independent phase inductance electric current, waveform signal is six pulse wave heads of input three-phase phase voltage, the phase voltage waveform of non-each phase.On principle, this control can make each phase inductance electric current all have the time (corresponding to the interval of phase voltage 60 degree-120 degree) of 60 degree to follow its input phase voltage in the half period, increases the maximum power that satisfies the IEC-1000-3-2A harmonic standard so can improve.But for the three-phase three-wire system input, six pulse wave head testing circuits of three-phase input phase voltage are very complicated, and the rectifier bridge DC side current detection circuit in the document [6] is also very complicated, so more difficult practicability.
The modified model three-phase PFC block diagram that Fig. 3, the 4th, the present invention propose.Wherein Fig. 4 (a) is very simple a kind of Average Current Control technology, triphase single-switch power factor correcting step-up converter comprises three-phase input end Va shown in this figure, Vb, Vc, output end vo, rectified three-phase circuit, pulse-width modulation circuit PWM and Voltage loop 1, described three-phase input end Va, Vb, Vc connects three-phase alternating-current supply respectively, output end vo is output as direct current, electronic switch of output two ends cross-over connection at rectification circuit, the control end of this electronic switch links to each other with the output of pulse-width modulation circuit (PWM), and the inverting input of this pulse-width modulation circuit PWM links to each other with outside input triangular signal; It is characterized in that: also comprise electric current loop 2, the normal phase input end of described electric current loop 2 meets the output Vc of Voltage loop 1, and inverting input connects the output of current sampling circuit, and the output of electric current loop 2 then is connected to the normal phase input end of pulse-width modulation circuit PWM.
In this scheme, (bandwidth is far below netting frequently, and output generally＜10Hz) is the benchmark of current inner loop (fs is a switching frequency for fast ring, generally〉1/10fs) for Voltage loop.The result of control is that the electric current (Idc) of artificail commutation bridge DC side becomes direct current, thereby can make each phase inductance electric current in the half period, all have the time (corresponding to the interval of phase voltage 60 degree～120 degree) of 60 degree to be direct current, total phase current is approximately trapezoidal wave, so can increase the maximum power that satisfies the IEC-1000-3-2A harmonic standard.
Fig. 4 (b) adopts the structure of Fig. 3 to realize Fig. 4 (a), and the difference of Fig. 4 (a) is also to be connected to multiplier 3 between the output of the normal phase input end of electric current loop 2 and Voltage loop 1, the waveform voltage output terminals A of this multiplier 3 links to each other with a fixing voltage signal Vcon with effective value input C, and signal input part B links to each other with the output of Voltage loop 1.
Though theoretically, this multiplier 3 is nonsensical, can omit fully, and in actual applications, this circuit has certain directive significance.In order to use circuit shown in Figure 3, existing ready-made integrated circuit (IC) chip has a multiplier 3 between electric current loop 2 and Voltage loop 1 in this chip.In order to use ready-made chip, can use connection shown in Fig. 4 (b) with multiplier " perforation ".Be equivalent to that 6 waveform voltage signals need not detect in Fig. 3 circuit this moment, and alternative with a fixing direct voltage.Make that control realizes simplifying greatly.
Circuit of the present invention is the electric current of Current Transformer detection rectifier bridge DC side directly, makes realization simpler.
Average Current Control triphase single-switch DCM BOOSTPFC with Fig. 4 principle realizes can adopt resolution element or integrated IC and any kind of current detection circuit, and they all belong to the protection range of this patent.
Drawn three current sensors among Fig. 4, in the application circuit of reality,, and connected corresponding sample circuit as long as adopt a pair of current sensor that detects id, is or the current sensor that detects idc.Its annexation is seen shown in the figure.
When adopting idc, described current sampling circuit is serially connected with on the bus of rectification circuit DC side near end, and the signal of its sampling is DC side near end bus current idc.When adopting the superposition of id, is, described current sampling circuit has two, be input to the inverting input of electric current loop 2 behind the output signal superposition of the two, one of them current sampling circuit is serially connected with on the rectification circuit switching diode D, the signal of its sampling is diode current id, another is serially connected with on the electronic switch, and the signal of its sampling is switching current is.
Be that example is introduced operation principle of the present invention only below with the block diagram of Fig. 4 (a), 4 (b).The input current normalization waveform of the single switch three-phase DCM Boost converter of tradition [document 1] as shown in Figure 5.Adopt the modified model three-phase PFC of Fig. 3, its input current waveform as shown in Figure 6.As seen can reduce the each harmonic content of input current greatly.
Satisfy condition (1) at the circuit parameter that guarantees Fig. 4 (a), 4 (b): the electric current of three inductance is DCM; Condition (2): the Voltage loop bandwidth is very low, and (generally＜10Hz), promptly the electrical network after rectification is in the cycle, and Voltage loop output can be approximately constant; And condition (3): three inductance L a=Lb=Lc; (experimental example is: R1=20K, R2=100K, C1=470pF when the electric current loop among Fig. 4 (a), 4 (b) is designed to enough when fast so, C2=0.01uF), its input current waveform will be as shown in Figure 7, compares with Fig. 6, and the each harmonic content of this input current is existing obviously to be reduced.By regulating the parameter of electric current loop, also can make it have minimum distortion.
Emphasis of the present invention is that the Average Current Control of Current Clamped has been generalized in the triphase single-switch DCM BOOST converter first, has realized the three-phase PFC of quite stable with very simple detection and control.This programme has been used for three-phase input (304V-456VAC), in the communication primary power source prestage single tube DCM three-phase Boost converter of 48V@100A output (being rated for 53.5V@100A), in the input voltage of IEC1000-3-2A standard code and loading range, can both quite easily satisfy harmonic requirement.From specific implementation relatively, it is all simpler than existing various controlling schemes, and is reliable, and dynamic characteristic is better.
Claims (3)
1. triphase single-switch power factor correcting step-up converter, comprise three-phase input end (Va, Vb, Vc), output (Vo), rectified three-phase circuit, pulse-width modulation circuit (PWM) and Voltage loop (1), described three-phase input end (Va, Vb, Vc) connect three-phase alternating-current supply respectively, output (Vo) is output as direct current, electronic switch of output two ends cross-over connection at rectification circuit, the control end of this electronic switch links to each other with the output of pulse-width modulation circuit (PWM), the inverting input of this pulse-width modulation circuit (PWM) links to each other with outside input triangular signal, at a rectification circuit DC side anode serial connection forward switching diode (D); The sampling of input termination output voltage (Vf) and the reference voltage (Vref) of Voltage loop (1);
It is characterized in that: also comprise electric current loop (2), the normal phase input end of described electric current loop (2) directly or connect the output (Vc) of Voltage loop (1) by multiplier (3), inverting input connects the output of current sampling circuit, and the output of electric current loop (2) then is connected to the normal phase input end of pulse-width modulation circuit (PWM); The waveform voltage output (A) of described multiplier (3) links to each other with a fixing voltage signal Vcon with effective value input (C), and that link to each other with the output of Voltage loop (1) then is signal input part (B).
2, triphase single-switch power factor correcting step-up converter as claimed in claim 1 is characterized in that: described current sampling circuit is serially connected with on the bus of rectification circuit DC side near end, and the signal of its sampling is a DC side near end bus current (idc).
3, triphase single-switch power factor correcting step-up converter as claimed in claim 1 or 2, it is characterized in that: described current sampling circuit has two, be input to the inverting input of electric current loop (2) behind the output signal superposition of the two, one of them current sampling circuit is serially connected with on the switching diode (D), the signal of its sampling is the electric current (id) of switching diode, another is serially connected with on the electronic switch, and the signal of its sampling is switching current (is).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00136053A CN1132298C (en) | 2000-12-26 | 2000-12-26 | Triphase single-switch power factor correcting step-up converter |
| PCT/CN2001/001646 WO2002052708A1 (en) | 2000-12-26 | 2001-12-26 | A three-phase single switch power factor correcting boost converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00136053A CN1132298C (en) | 2000-12-26 | 2000-12-26 | Triphase single-switch power factor correcting step-up converter |
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| CN1308406A CN1308406A (en) | 2001-08-15 |
| CN1132298C true CN1132298C (en) | 2003-12-24 |
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| CN00136053A Expired - Fee Related CN1132298C (en) | 2000-12-26 | 2000-12-26 | Triphase single-switch power factor correcting step-up converter |
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| Country | Link |
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| CN (1) | CN1132298C (en) |
| WO (1) | WO2002052708A1 (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1540801A1 (en) * | 2002-09-20 | 2005-06-15 | STMicroelectronics S.r.l. | Power factor correction device for switching power supplies |
| US6900623B2 (en) * | 2003-07-10 | 2005-05-31 | System General Corp. | Power supply having multi-vector error amplifier for power factor correction |
| CN1332502C (en) * | 2003-08-20 | 2007-08-15 | 台达电子工业股份有限公司 | Three-phase power factor compensating converter with flexibly switching |
| CN101132132B (en) * | 2006-08-25 | 2011-05-18 | 佛山市顺德区顺达电脑厂有限公司 | Power factor adjusting device and power supply system |
| CN101291106B (en) * | 2007-04-20 | 2010-12-01 | 台达电子工业股份有限公司 | Sampling method for adjusting duty ratio |
| CN101867283B (en) * | 2010-06-13 | 2014-03-19 | 中兴通讯股份有限公司 | Method and device for improving control characteristic of power factor correction |
| TWI436190B (en) * | 2010-09-16 | 2014-05-01 | System General Corp | Correction circuit, correction apparatus and correction method for power converter |
| CN104467397B (en) * | 2012-12-13 | 2017-01-11 | 国网山东省电力公司蒙阴县供电公司 | Chain type SVG device suitable for correcting power factor and improving utilization rate of transformer |
| CN103401267A (en) * | 2013-07-17 | 2013-11-20 | 天津大学 | Grid-connected circuit for small-sized wind-driven generator |
| CN105988496B (en) * | 2015-02-10 | 2018-11-23 | 杨宏 | Digitize current control device |
| CN108414825A (en) * | 2018-02-07 | 2018-08-17 | 大连理工大学 | A kind of input and output scaling method of 4-20mA electric current loops |
| CN109450276A (en) * | 2018-11-20 | 2019-03-08 | 株洲科盟车辆配件有限责任公司 | Power generator and train |
| CN111697813B (en) * | 2019-03-13 | 2022-03-04 | 青岛海尔智能技术研发有限公司 | Frequency conversion equipment, control method and device of PFC circuit of frequency conversion equipment and storage medium |
| CN110611442A (en) * | 2019-11-08 | 2019-12-24 | 成都信息工程大学 | PWM (pulse-width modulation) rectifying circuit for charging pile |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5847944A (en) * | 1997-08-06 | 1998-12-08 | Delta Electronics, Inc. | Robust, harmonic-injection system for single-switch, three-phase, discontinuous-conduction-mode boost rectifiers |
| CN1111938C (en) * | 1999-12-27 | 2003-06-18 | 艾默生网络能源有限公司 | Single-phase rectifier with power-factor correcting circuit |
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2000
- 2000-12-26 CN CN00136053A patent/CN1132298C/en not_active Expired - Fee Related
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- 2001-12-26 WO PCT/CN2001/001646 patent/WO2002052708A1/en not_active Application Discontinuation
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| WO2002052708A1 (en) | 2002-07-04 |
| CN1308406A (en) | 2001-08-15 |
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Address after: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee after: Vitamin Technology Co., Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee before: Aimosheng Network Energy Source Co., Ltd. |
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Granted publication date: 20031224 Termination date: 20191226 |