WO2009123094A1 - 電力アシスト装置 - Google Patents
電力アシスト装置 Download PDFInfo
- Publication number
- WO2009123094A1 WO2009123094A1 PCT/JP2009/056461 JP2009056461W WO2009123094A1 WO 2009123094 A1 WO2009123094 A1 WO 2009123094A1 JP 2009056461 W JP2009056461 W JP 2009056461W WO 2009123094 A1 WO2009123094 A1 WO 2009123094A1
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- WIPO (PCT)
- Prior art keywords
- power
- inverter
- voltage
- unit
- chopper
- Prior art date
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- 238000012937 correction Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 abstract description 7
- 238000007599 discharging Methods 0.000 abstract 2
- 241001125929 Trisopterus luscus Species 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 230000002457 bidirectional effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/32—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from a charging set comprising a non-electric prime mover rotating at constant speed
-
- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
Definitions
- the present invention relates to a power assist device, and more particularly to a power assist device that eliminates the need for a voltage / current detection device in a power system.
- the power assist device is connected between an AC power system and a load and used as a load power assist.
- This power assist device is configured by connecting a power storage device combining an buck-boost chopper and a storage device such as an electric double layer capacitor and the storage device to a DC circuit of an inverter.
- power assist refers to one that includes peak power cut, load leveling, power storage, and compensation for instantaneous voltage drop.
- Patent Document 1 and Patent Document 2 etc. are known.
- FIG. 4 is a schematic block diagram of the power assist device.
- An inverter 1 includes a forward converter 2 for converting alternating current to direct current and a bidirectional converter 3 having a bidirectional conversion function, and is installed between a commercial power supply 4 and a load 5.
- 6 is a buck-boost chopper
- 7 is a storage device, and these 6 and 7 constitute a power storage device, which is connected to the DC circuit of the inverter 1.
- this power assist device for example, when the load 5 is in a regenerative state, the DC voltage of the inverter 1 rises, and when the voltage becomes equal to or higher than a preset charging voltage, the storage device 7 is charged via the chopper 6 When the voltage of the commercial power supply 4 decreases, the energy stored in the storage device 7 is supplied to the load 5 via the chopper 6 and the bidirectional conversion unit 3.
- JP 2003-244840 JP-A-11-27874 JP 2003-244840 JP-A-11-27874
- the monitor voltage for performing charge control and discharge control is a transformer for an instrument on the AC side of the forward converter of the inverter, A current transformer or the like is installed, and the detected voltage and current obtained are monitored by the monitoring unit, and this is performed based on the voltage. Therefore, a device for monitoring commercial power is required, and the size and cost of the power assist device are increased.
- An object of the present invention is to provide a power assist device that eliminates the need for a commercial power monitoring device for charge and discharge control.
- a chopper and a power storage device having a storage device are connected to a DC circuit of an inverter connected to an AC power supply, and connected to the inverter to assist load power.
- the instantaneous output power is detected by a power calculation unit that detects the voltage between the inverter and the load and current, performs coordinate conversion, and calculates power based on the converted voltage and current, and a correction calculation unit that corrects the calculated power.
- a voltage control unit for calculating a charge command value and a discharge command value, each constituting a calculation unit, and separately inputting deviation signals between upper limit voltage and lower limit voltage set values and detected DC circuit voltage of the inverter.
- a chopper control circuit comprising a limiter unit for separately inputting a signal from each voltage control unit, and a PWM control unit for generating a PWM signal of the chopper by separately inputting a signal from each limiter unit;
- the power signal calculated by the output power calculation unit is output to each limiter unit of the chopper control circuit to vary the limiter value.
- the present invention is characterized in that the correction operation unit of the instantaneous output power operation unit corrects the input / output power characteristic of the inverter.
- the power assist apparatus power assist control based on the estimated instantaneous output power is possible without the power detection apparatus on the AC power supply side of the inverter, and the apparatus can be miniaturized. realizable. Further, in parallel operation, adjustment of load sharing can be easily performed. Further, by grasping the efficiency characteristic as the power assist device and setting the optimum efficiency point as the threshold of the limiter, the charge / discharge efficiency can be utilized to the maximum.
- FIG. 1 is a block diagram showing an embodiment of the present invention.
- Reference numeral 10 denotes an instantaneous output power calculation unit, and the instantaneous output power calculation unit 10 inputs coordinate and detection units 11 and 12 which receive voltage and current detected from the output side of the inverter 1 and convert them into Vq and Iq, respectively; It has functions of a power calculation unit 13 that calculates power based on the converted q-axis voltage and current, and a correction calculation unit 14.
- the instantaneous output power calculation unit 10 utilizes a function incorporated in the control device of the inverter.
- Reference numeral 20 denotes a chopper control circuit, which includes a charge control unit and a discharge control unit.
- 21a and 21b are subtraction units
- 22a and 22b are voltage control units
- 23a and 23b are limiter units
- 24a and 24b are PWM control units
- suffix a is a charge control unit
- b is a discharge control unit.
- the subtraction unit 21a receives the preset upper limit voltage setting value VDCH * and the detection voltage VDC of the DC circuit of the inverter 1 to calculate a difference signal between them, and the difference signal is input to the voltage control unit 22a.
- a charge command value corresponding to the difference signal is calculated and output to the limiter unit 23a.
- the limiter value is changed by the voltage Pout from the instantaneous output power calculation unit 10, and the PWM control unit 24a generates a PWM signal according to the charge command value limited by the limiter value. PWM control is performed on the switching elements. As a result, the DC circuit voltage of the inverter 1 raised in the load regeneration state is charged in the storage device (here, the electric double layer capacitor) 7 via the chopper 6 and the reactor 8.
- the lower limit voltage set value VDCL * set in advance and the detection voltage VDC of the DC circuit of the inverter 1 are input to the subtraction unit 21b on the discharge control unit side to calculate the difference signal between them, and the difference signal A discharge command value input to the control unit 22b and corresponding to the difference signal is calculated and output to the limiter unit 23b.
- the limiter value is changed by the voltage Pout from the instantaneous output power calculation unit 10, the PWM control unit 24b generates a PWM signal according to the discharge command value limited by the limiter value, and the discharge of the chopper 6 is performed. PWM control is performed on the switching elements. Thereby, the energy stored in the storage device 7 is supplied to the DC circuit of the inverter 1 via the reactor 8 and the chopper 6.
- the charge control when the load 5 is in the power running state and the power running load becomes load power (load current) equal to or higher than a predetermined threshold value, the charge control is released to set the discharge current command. Discharge control for peak cut. As the load decreases and the negative overcurrent decreases, the limiter of the limiter unit 25b is narrowed by the power Pout, and the discharge control is stopped when the set charge stop voltage is reached. In addition, even when the load 5 is in the regenerative state, the charge control is executed when the load power (load current) equal to or higher than a predetermined threshold value is obtained in the same manner.
- FIG. 2 shows a vector diagram of the output voltage and current of the inverter.
- V0ref [V] is the output voltage command (phase voltage: E0ref) of the inverter
- I0det [A] is the detected current (output current command), and the power calculation unit 13 uses these signals to make instantaneous
- the estimation operation of the output power Pout is performed.
- Pout [kW] ⁇ 3
- the efficiency characteristic of the inverter can be calculated by performing a correction as shown in the following equation by a preliminary evaluation test.
- FIG. 3 shows input / output power characteristics of the inverter, where the vertical axis represents input power Pin and the horizontal axis represents output power Pout.
- the correction operation unit 14 can estimate the input power to the inverter under an arbitrary operating condition of the inverter by pre-calculating and interpolating the software as aw.
- A, Pin a1 ⁇ Pout + b1 (area A) (I)
- Pin a2 ⁇ Pout + b2 (area B)
- Pin a3 x Pout + b3 (region C)
- a1 to a3 and b1 to b3 are constants.
- the efficiency is lowered as the region B is the most efficient and the region C (the power increase direction) is reached. Further, even in the region A where the input power is smaller, the inverter efficiency is reduced due to the loss.
- the correction operation unit 14 interpolates linearly (in a linear expression) in each region.
- the instantaneous output voltage Pout calculated by the instantaneous output power calculation unit 10 provided in the control circuit of the inverter is output to the chopper control circuit 20, and the limit value of the limiter unit 23 (23a, 23b) is varied.
- the chopper 6 can be controlled to adjust the charge / discharge power according to the load state to perform power assist.
- the power assist device power assist control based on the estimated instantaneous output power can be performed without providing the power detection device on the AC power supply side of the inverter, and the device can be miniaturized. Become. Further, in parallel operation, adjustment of load sharing can be easily performed. Further, by grasping the efficiency characteristic as the power assist device and setting the optimum efficiency point as the threshold of the limiter, the charge / discharge efficiency can be utilized to the maximum.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Description
この電力アシスト装置は、例えば、負荷5が回生状態になるとインバータ1の直流電圧が上昇し、その電圧が予め設定された充電電圧以上となったときに、チョッパ6を介して蓄電デバイス7が充電され、商用電源4の電圧が低下したとき、蓄電デバイス7に蓄積されたエネルギーをチョッパ6、双方向変換部3を介して負荷5に電力を供給する。
前記インバータと負荷間の電圧、電流を検出して座標変換し、変換された電圧と電流を基に電力を算出する電力演算部と、この算出された電力を補正する補正演算部で瞬時出力電力演算部を構成すると共に、上限電圧及び下限電圧の各設定値と前記インバータの検出された直流回路電圧との偏差信号を各別に入力して充電指令値と放電指令値を演算する電圧制御部と、各電圧制御部からの信号を各別に入力するリミッタ部と、各リミッタ部からの信号を各別に入力して前記チョッパのPWM信号を生成するPWM制御部でチョッパ制御回路を構成し、前記瞬時出力電力演算部にて算出された電力信号をチョッパ制御回路の各リミッタ部に出力してリミッタ値を可変するよう構成したことを特徴としたものである。
また、負荷5が回生状態となったときも、同様にして予め決められた閾値以上の負荷電力(負荷電流)となったときに充電制御を実行する。
図2はインバータの出力電圧と電流のベクトル図を示したものである。V0ref[V]はインバータの出力電圧指令(相電圧:E0ref)、I0det[A]は検出電流(出力電流指令)で、電力演算部13はこれらの信号を用いて、ソフトウエアで次式により瞬時出力電力Poutの推定演算を実行する。
Pout[kW]=√3|V0ref|×|I0det|cosθ
また、インバータの効率特性は、事前の評価試験により次式のような補正を行えば効率が算出できる。
η=Pout/Pin[%]
図3はインバータの入出力電力特性を示したもので、縦軸は入力電力Pin、横軸に出力電力Poutをとったものである。補正演算部14は、ア~ウのようにソフトウエア予め計算し補間することで、インバータの任意の運転条件下におけるインバータへの入力電力の推定が可能となる。
ア、Pin =a1×Pout+b1(領域A)
イ、Pin =a2×Pout+b2(領域B)
ウ、Pin =a3×Pout+b3(領域C)
ここで、a1~a3、b1~b3は定数である。
本発明では、インバータの制御回路に設けられた瞬時出力電力演算部10が演算した瞬時出力電圧Poutをチョッパ制御回路20に出力し、そのリミッタ部23(23a,23b)のリミット値を可変することでチョッパ6を制御し、負荷状態に応じながら充放電の電力を加減し、電力アシストを行うことができる。
2… 順変換部
3… 双方向変換部
6… チョッパ
7… 蓄電デバイス
8… リアクトル
10… 瞬時出力電力演算部
11,12… 座標変換部
13… 電力演算部
20… チョッパ制御回路
22… 電圧制御部
23… リミッタ部
24… PWM制御部
Claims (2)
- 交流電源に接続されたインバータの直流回路に、チョッパ、蓄電デバイスを有する電力蓄積装置を接続し、インバータに接続されて負荷電力をアシストするものにおいて、
前記インバータと負荷間の電圧、電流を検出して座標変換し、変換された電圧と電流を基に電力を算出する電力演算部と、この算出された電力を補正する補正演算部で瞬時出力電力演算部を構成すると共に、上限電圧及び下限電圧の各設定値と前記インバータの検出された直流回路電圧との偏差信号を各別に入力して充電指令値と放電指令値を演算する電圧制御部と、各電圧制御部からの信号を各別に入力するリミッタ部と、各リミッタ部からの信号を各別に入力して前記チョッパのPWM信号を生成するPWM制御部でチョッパの制御回路を構成し、前記瞬時出力電力演算部にて算出された電力信号を、チョッパ制御回路の各リミッタ部に入力してリミッタ値を可変するよう構成したことを特徴とした電力アシスト装置。 - 前記瞬時出力電力演算部の補正演算部は、インバータの入出力電力特性を補正することを特徴とした請求項1記載の電力アシスト装置。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/935,118 US8598738B2 (en) | 2008-03-31 | 2009-03-30 | Power assist device |
GB201018342A GB2471436B (en) | 2008-03-31 | 2009-03-30 | Power assist device |
CN2009801116939A CN101981799B (zh) | 2008-03-31 | 2009-03-30 | 电力辅助装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008091292A JP5245498B2 (ja) | 2008-03-31 | 2008-03-31 | 電力アシスト装置 |
JP2008-091292 | 2008-03-31 |
Publications (1)
Publication Number | Publication Date |
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WO2009123094A1 true WO2009123094A1 (ja) | 2009-10-08 |
Family
ID=41135470
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2009/056461 WO2009123094A1 (ja) | 2008-03-31 | 2009-03-30 | 電力アシスト装置 |
Country Status (5)
Country | Link |
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US (1) | US8598738B2 (ja) |
JP (1) | JP5245498B2 (ja) |
CN (1) | CN101981799B (ja) |
GB (1) | GB2471436B (ja) |
WO (1) | WO2009123094A1 (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP4958052B2 (ja) * | 2010-02-24 | 2012-06-20 | ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー | 系統電力平準化装置および画像診断システム |
JP5427845B2 (ja) * | 2011-07-08 | 2014-02-26 | 山洋電気株式会社 | 電力給電システム |
JP2013150412A (ja) * | 2012-01-18 | 2013-08-01 | Kyushu Electric Power Co Inc | 可変出力充電装置 |
CN103475229A (zh) * | 2013-09-05 | 2013-12-25 | 无锡晶凯科技有限公司 | 一种氮化镓基隔离dc-dc电源模块 |
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JP2001320893A (ja) * | 2000-05-09 | 2001-11-16 | Mitsubishi Electric Corp | 電動機駆動装置 |
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JP3484621B2 (ja) | 1997-07-04 | 2004-01-06 | 株式会社日立製作所 | 二次電池を用いる電力貯蔵システム |
JP4283963B2 (ja) * | 2000-02-28 | 2009-06-24 | 三菱電機株式会社 | エレベータの制御装置 |
JP2003244840A (ja) | 2001-12-14 | 2003-08-29 | Furukawa Electric Co Ltd:The | 負荷平準化装置 |
-
2008
- 2008-03-31 JP JP2008091292A patent/JP5245498B2/ja not_active Expired - Fee Related
-
2009
- 2009-03-30 US US12/935,118 patent/US8598738B2/en not_active Expired - Fee Related
- 2009-03-30 CN CN2009801116939A patent/CN101981799B/zh not_active Expired - Fee Related
- 2009-03-30 WO PCT/JP2009/056461 patent/WO2009123094A1/ja active Application Filing
- 2009-03-30 GB GB201018342A patent/GB2471436B/en not_active Expired - Fee Related
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JPH08237884A (ja) * | 1995-02-28 | 1996-09-13 | Kyocera Corp | 太陽光発電装置 |
JP2001320893A (ja) * | 2000-05-09 | 2001-11-16 | Mitsubishi Electric Corp | 電動機駆動装置 |
JP2004265683A (ja) * | 2003-02-28 | 2004-09-24 | Nissan Motor Co Ltd | 燃料電池発電制御システム |
JP2005324887A (ja) * | 2004-05-12 | 2005-11-24 | Toshiba Elevator Co Ltd | ハイブリッド駆動型エレベータの制御装置 |
JP2005354825A (ja) * | 2004-06-11 | 2005-12-22 | Nissan Motor Co Ltd | ハイブリッド車両のsoc演算装置 |
JP2008062826A (ja) * | 2006-09-08 | 2008-03-21 | West Japan Railway Co | 電力貯蔵装置 |
Also Published As
Publication number | Publication date |
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US20110068628A1 (en) | 2011-03-24 |
GB2471436B (en) | 2013-02-13 |
GB201018342D0 (en) | 2010-12-15 |
US8598738B2 (en) | 2013-12-03 |
CN101981799A (zh) | 2011-02-23 |
JP2009247127A (ja) | 2009-10-22 |
JP5245498B2 (ja) | 2013-07-24 |
GB2471436A (en) | 2010-12-29 |
CN101981799B (zh) | 2013-12-04 |
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