WO2012023209A1 - 接地装置 - Google Patents
接地装置 Download PDFInfo
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- WO2012023209A1 WO2012023209A1 PCT/JP2010/064090 JP2010064090W WO2012023209A1 WO 2012023209 A1 WO2012023209 A1 WO 2012023209A1 JP 2010064090 W JP2010064090 W JP 2010064090W WO 2012023209 A1 WO2012023209 A1 WO 2012023209A1
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- Prior art keywords
- power
- output bus
- current
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- 238000001514 detection method Methods 0.000 claims description 35
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 239000003990 capacitor Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 238000009499 grossing Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/02016—Circuit arrangements of general character for the devices
- H01L31/02019—Circuit arrangements of general character for the devices for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/02021—Circuit arrangements of general character for the devices for devices characterised by at least one potential jump barrier or surface barrier for solar cells
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Definitions
- DC power source for example, a DC positive bus between a solar cell and a power converter in a system that converts DC power of a solar cell through a power converter (power conditioner) and supplies this to an AC power system
- the present invention relates to a grounding device installed between a DC negative bus and a ground.
- Patent Document 1 is a power supply device that supplies DC power supplied from, for example, a solar battery to a grounded ground load, and the input / output for supplying power to the ground load has non-insulated power supply means; and A first output switch for switching between the power supply means and the ground load; an impedance means, a voltage or current detection means, and a ground switch between the vicinity of the power input end of the power supply device and the ground potential.
- the ground fault detection except for the ground load detects the voltage difference of the main voltage based on the voltage or current value detected by the voltage or current detection means when the ground switch is closed. is there
- Patent Document 1 Since Patent Document 1 has such a configuration, it is possible to detect a ground fault without being connected to a grounded load.
- Patent Document 2 is a grid-connected inverter that converts DC power input from, for example, a solar cell into AC power via a converter circuit and an inverter circuit whose inputs and outputs are not insulated, and outputs the AC power to a grounded system.
- the solar cell comprising a DC ground fault detecting means for detecting a ground fault of the solar cell by controlling the input voltage or an intermediate voltage between the converter circuit and the inverter circuit to increase or decrease the solar cell.
- the ground detection is a grid interconnection inverter that detects a difference in main current.
- Patent Document 2 Since Patent Document 2 has such a configuration, a control means for controlling the input voltage or the intermediate voltage to raise or lower the solar cell ground potential to a value other than near zero is provided. A ground fault in the battery can be reliably detected.
- the method of providing a current detector on the grounding wire knows the ground current, so it can know the complete ground fault condition (ground fault when there is no impedance between the ground fault point and the ground line) or the incomplete ground fault condition.
- the complete ground fault condition ground fault when there is no impedance between the ground fault point and the ground line
- the incomplete ground fault condition it is difficult to ensure detection accuracy due to the magnitude of the short-circuit current, and the short-circuit current path between the ground fault point and the ground line cannot be disconnected.
- the invention corresponding to claim 1 is directed to a DC power source and DC power of the DC power source input through a DC positive output bus and a DC negative output bus to perform AC power conversion and AC power.
- the invention corresponding to claim 2 is directed to a DC power source and DC power of the DC power source input through a DC positive output bus and a DC negative output bus to perform AC power conversion and AC power.
- a power converter to be supplied to the system, and connected to the DC positive output bus and the DC negative output bus, respectively, and when the current flowing through the circuit exceeds a first protection set value, the DC power supply and the power converter Between the power converter and the circuit breaker, the DC positive output bus or the DC negative output bus and the ground.
- Current detection value detected by the detector a grounding device having a determination unit to provide the open operation command to the circuit breaker when the first protection level less than the second protection level.
- the invention corresponding to claim 3 is directed to a DC power source and DC power of the DC power source input through a DC positive output bus and a DC negative output bus to perform AC power conversion and AC power.
- a power converter to be supplied to the system, and connected to the DC positive output bus and the DC negative output bus, respectively, and when the current flowing through the circuit exceeds a first protection set value, the DC power supply and the power converter Between the power converter and the circuit breaker, the DC positive output bus or the DC negative output bus and the ground.
- Current detection value detected by the detector is a ground apparatus and a determiner for generating a warning when the protection setting value is smaller than the second protection level of the fuses.
- an invention corresponding to claim 4 is directed to a DC power source and DC power of the DC power source input through a DC positive output bus and a DC negative output bus to perform AC power conversion and AC power.
- an opening operation command is given to the circuit breaker, and the current detection value detected by the current detector is a second protection setting value equal to the first protection setting value.
- a determination unit that gives an open operation command to the circuit breaker and that generates an alarm when a current detection value detected by the current detector is a second protection setting value that is smaller than the protection setting value of the fuse; It is a grounding device.
- a grounding device that can open an instantaneous flow path at the time of a complete ground fault, open a flow path at the time of an incomplete ground fault, or provide an alarm notification (also serving as a malfunction prevention) by continuing operation.
- FIG. 1 is a schematic configuration diagram for explaining a first embodiment of a grounding device of the present invention.
- FIG. 2 is a diagram for explaining the operation example 1 of FIG.
- FIG. 3 is a diagram for explaining the operation example 2 of FIG.
- FIG. 4 is a diagram for explaining the operation example 3 of FIG.
- the DC power that is the output power of the solar cell (PV) 1 is converted into AC power by a power converter (power conditioner), for example, an inverter 3 and supplied to the AC power system 8.
- a power converter power conditioner
- an insulation transformer 10 is connected to a connection bus 13 that connects the AC power system 8.
- a smoothing capacitor 4 is connected between the DC positive bus (P) 11 and the DC negative bus (N) 12 on the input side of the inverter 3, and a connection bus between the output side of the inverter 3 and the insulating transformer 10.
- a snubber circuit composed of a reactor 5 and a capacitor 6 is connected to 13, and a switch 7 is connected to a connection bus 13 between the snubber circuit and the insulating transformer 10.
- a backflow preventing diode 9 is connected to a part of the DC positive bus 11 to which the output side of the solar cell 1 and the circuit breaker 21 with a trip function are connected.
- the grounding device 2 of the present invention described below is installed on the DC positive bus 11 and the DC negative bus 12 between the output side of the solar cell 1 and the sliding capacitor 4.
- the grounding device 2 is connected in series to the DC positive bus 11 and the DC negative bus 12, and includes a circuit breaker 21 that performs a trip operation when a protection set value (set current value) or exceeds this,
- a protection set value set current value
- a ground line 25 that connects between the DC negative bus 12 and the ground 26, to which the smoothing capacitor 4 is connected
- a current detector 23 that detects a current flowing through the ground line 25, and one of the ground lines 25 Fused when the current flowing through the ground line 25 exceeds a current detection level that does not damage the current detector 23, and is in a complete ground fault state exceeding a first protection setting value, for example, 5A
- a fuse 22 that does not blow when a current detection level that does not break the current detector 23, for example, an incomplete ground fault state of 10 A or less, and a determiner 24 described below are provided.
- the determiner 24 gives an open operation command (trip command) to the circuit breaker 21 when the current detection value Ig detected by the current detector 23, for example, 1000A exceeds a first protection setting value, for example, 5A, and also detects the current.
- a first protection setting value for example, 5A
- the second protection setting value 5A equal to the first protection setting value 5A
- an opening operation command is given to the circuit breaker 21, and further detected by the current detector 23
- the detected current value Ig, for example, 1A is a second protection setting value, for example, 0.5A, which is smaller than the protection setting value for the fuse 22, an alarm is generated for the upper monitoring side (not shown).
- the fuse 22 is inserted in series in a part of the ground line 25 as shown in FIG. 2 and exceeds a current detection level such as 10 A at which the current flowing through the ground line 25 does not break the current detector 23, and the first protection.
- the current detector 23 is, for example, a Hall CT, which is not saturated with direct current, and can detect not only alternating current but also direct current.
- the current detector 23 and the fuse 22 are selected to have the following relationship. That is, the current detector 23 is selected to be small enough to measure a ground fault current of several A, and the fuse 22 is blown at a protection setting value that does not damage the current detector 23, for example, a current value exceeding 5A. Choose what you want.
- the complete ground fault (short circuit) state will be described with reference to FIG. Now, for example, when a current of 1000 A flows between the output side of the solar cell 1 and the inverter 3, the ground circuit to which the fuse 22 and the current detector 23 are instantaneously connected is opened by the fusing of the fuse 22. At the same time, since the protection set value is set to 5A, since the detected value of the current detector 23 is 1000A, a trip command is given from the determiner 24 to the breaker 21, and the breaker 21 is opened. It becomes.
- the complete ground fault means that the DC positive bus 11 and the DC negative bus 12 are connected with no impedance between the DC positive bus 11 and the DC negative bus 12.
- the DC positive bus 11 and the DC negative bus 12 are connected in the state where there is an imperfect ground fault and there is an impedance between the DC positive bus 11 and the DC negative bus 12.
- grounding device described above is beneficial when applied to a photovoltaic power conditioner, particularly when N grounding or P grounding is required on the power conditioner side.
- the determination unit 24 has been described as including all of FIGS. 2, 3 and 4 for explaining the operation of the present invention. However, the determination unit 24 includes only one of them. However, it goes without saying that the present invention is established.
Abstract
Description
Claims (5)
- 直流電源と、
前記直流電源の直流電力を直流正側出力母線及び直流負側出力母線を介して入力し交流電力に変換する電力変換器と、
前記電力変換器で変換した交流電力を絶縁変圧器を介して供給する交流電力系統と、
前記直流正側出力母線及び直流負側出力母線にそれぞれ接続され、その回路に流れる電流が第1の保護設定値を超えたとき前記直流電源と前記電力変換器との間の電路を開放可能にする遮断器と、
前記電力変換器と前記遮断器との間であって、前記直流正側出力母線又は前記直流負側出力母線と対地との間を接続する接地線と、
前記接地線に流れる電流を検出する電流検出器と、
前記接地線の一部に直列に挿入され、前記接地線に流れる電流が前記電流検出器を壊さないような電流検出レベルを超え、第1の保護設定値を超えた完全地絡状態のとき溶断するヒューズと、
前記電流検出器で検出した電流検出値が前記遮断器の第1の保護設定値を超えたとき前記遮断器に対して開放動作指令を与える判定器と、
を具備したことを特徴とする接地装置。 - 直流電源と、
前記直流電源の直流電力を直流正側出力母線及び直流負側出力母線を介して入力し交流電力に変換する電力変換器と、
前記電力変換器で変換した交流電力を絶縁変圧器を介して供給する交流電力系統と、
前記直流正側出力母線及び直流負側出力母線にそれぞれ接続され、その回路に流れる電流が第1の保護設定値を超えたとき前記直流電源と前記電力変換器との間の電路を開放可能にする遮断器と、
前記電力変換器と前記遮断器との間であって、前記直流正側出力母線又は前記直流負側出力母線と対地との間を接続する接地線と、
前記接地線に流れる電流を検出する電流検出器と、
前記接地線の一部に直列に挿入され、前記電流検出器を壊さないような電流検出レベル以下の不完全地絡状態のときは溶断しないヒューズと、
前記電流検出器で検出した電流検出値が、前記第1の保護設定値より小さい第2の保護設定値のとき前記遮断器に対して開放動作指令を与える判定器と、
を具備したことを特徴とする接地装置。 - 直流電源と、
前記直流電源の直流電力を直流正側出力母線及び直流負側出力母線を介して入力し交流電力に変換する電力変換器と、
前記電力変換器で変換した交流電力を絶縁変圧器を介して供給する交流電力系統と、
前記直流正側出力母線及び直流負側出力母線にそれぞれ接続され、その回路に流れる電流が第1の保護設定値を超えたとき前記直流電源と前記電力変換器との間の電路を開放可能にする遮断器と、
前記電力変換器と前記遮断器との間であって、前記直流正側出力母線又は前記直流負側出力母線と対地との間を接続する接地線と、
前記接地線に流れる電流を検出する電流検出器と、
前記接地線の一部に直列に挿入され、前記電流検出器を壊さないような電流検出レベル以下の不完全地絡状態のときは溶断しないヒューズと、
前記電流検出器で検出した電流検出値が前記ヒューズの保護設定値より小さい第2の保護設定値のとき警報を発生する判定器と、
を具備したことを特徴とする接地装置。 - 直流電源と、
前記直流電源の直流電力を直流正側出力母線及び直流負側出力母線を介して入力し交流電力に変換する電力変換器と、
前記電力変換器で変換した交流電力を絶縁変圧器を介して供給する交流電力系統と、
前記直流正側出力母線及び直流負側出力母線にそれぞれ接続され、その回路に流れる電流が第1の保護設定値を超えたとき前記直流電源と前記電力変換器との間の電路を開放可能にする遮断器と、
前記電力変換器と前記遮断器との間であって、前記直流正側出力母線又は前記直流負側出力母線と対地との間を接続する接地線と、
前記接地線に流れる電流を検出する電流検出器と、
前記接地線の一部に直列に挿入され、前記接地線に流れる電流が前記電流検出器を壊さないような電流検出レベルを超え、第1の保護設定値を超えた完全地絡状態のとき溶断し、且つ前記電流検出器を壊さないような電流検出レベル以下の不完全地絡状態のときは溶断しないヒューズと、
前記電流検出器で検出した電流検出値が第1の保護設定値を超えたとき前記遮断器に対して開放動作指令を与え、また前記電流検出器で検出した電流検出値が、前記第1の保護設定値と等しい第2の保護設定値のとき前記遮断器に対して開放動作指令を与え、さらに前記電流検出器で検出した電流検出値が前記ヒューズの保護設定値より小さい第2の保護設定値のとき警報を発生する判定器と、
を具備したことを特徴とする接地装置。 - 前記前記電流検出器が壊されないような電流検出レベルは、前記判定器の誤検出防止のオフセット値とすることを特徴とする請求項1~4のいずれか1項に記載の接地装置。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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CN201080068675.XA CN103081268B (zh) | 2010-08-20 | 2010-08-20 | 接地装置 |
JP2012529469A JP5542942B2 (ja) | 2010-08-20 | 2010-08-20 | 接地装置 |
ES10856166.3T ES2620253T3 (es) | 2010-08-20 | 2010-08-20 | Dispositivo de conexión a tierra |
EP10856166.3A EP2608341B1 (en) | 2010-08-20 | 2010-08-20 | Grounding device |
PCT/JP2010/064090 WO2012023209A1 (ja) | 2010-08-20 | 2010-08-20 | 接地装置 |
US13/771,997 US9257829B2 (en) | 2010-08-20 | 2013-02-20 | Grounding apparatus |
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PCT/JP2010/064090 WO2012023209A1 (ja) | 2010-08-20 | 2010-08-20 | 接地装置 |
Related Child Applications (1)
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US13/771,997 Continuation US9257829B2 (en) | 2010-08-20 | 2013-02-20 | Grounding apparatus |
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WO2012023209A1 true WO2012023209A1 (ja) | 2012-02-23 |
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US (1) | US9257829B2 (ja) |
EP (1) | EP2608341B1 (ja) |
JP (1) | JP5542942B2 (ja) |
CN (1) | CN103081268B (ja) |
ES (1) | ES2620253T3 (ja) |
WO (1) | WO2012023209A1 (ja) |
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CN102882227A (zh) * | 2012-09-14 | 2013-01-16 | 江苏兆伏新能源有限公司 | 高功率光伏并网逆变器 |
US20130222951A1 (en) * | 2012-02-28 | 2013-08-29 | General Electric Company | Fault protection circuit for photovoltaic power system |
JP2015508991A (ja) * | 2012-02-20 | 2015-03-23 | エスエムエー ソーラー テクノロジー アーゲー | 接地と関連するサージ電圧に対する光電発生器の光起電モジュールの保護 |
JP2015080392A (ja) * | 2013-10-18 | 2015-04-23 | パナソニックIpマネジメント株式会社 | 電源供給装置 |
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WO2022091249A1 (ja) * | 2020-10-28 | 2022-05-05 | 東芝三菱電機産業システム株式会社 | 電力変換器 |
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WO2023145465A1 (ja) * | 2022-01-28 | 2023-08-03 | 株式会社デンソー | 車載電源システム |
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US20140313624A1 (en) * | 2013-04-23 | 2014-10-23 | Chicony Power Technology Co., Ltd. | Solar energy conversion apparatus |
CN103490402A (zh) * | 2013-09-05 | 2014-01-01 | 南京南瑞继保电气有限公司 | 一种光伏组件接地装置、监测装置及监测方法 |
RU181036U1 (ru) * | 2017-07-13 | 2018-07-04 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Калининградский государственный технический университет" | Устройство заземления нейтрали |
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WO2024021118A1 (zh) * | 2022-07-29 | 2024-02-01 | 华为数字能源技术有限公司 | 光伏供电系统及其控制方法 |
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CN102882227A (zh) * | 2012-09-14 | 2013-01-16 | 江苏兆伏新能源有限公司 | 高功率光伏并网逆变器 |
JP2015080392A (ja) * | 2013-10-18 | 2015-04-23 | パナソニックIpマネジメント株式会社 | 電源供給装置 |
JP2015173567A (ja) * | 2014-03-12 | 2015-10-01 | オムロン株式会社 | 故障対処装置、および電源システム |
WO2022091249A1 (ja) * | 2020-10-28 | 2022-05-05 | 東芝三菱電機産業システム株式会社 | 電力変換器 |
JP7435817B2 (ja) | 2020-10-28 | 2024-02-21 | 東芝三菱電機産業システム株式会社 | 電力変換器 |
WO2022230397A1 (ja) * | 2021-04-27 | 2022-11-03 | 株式会社日立製作所 | 単独運転系統構成装置、単独運転系統構成システム、および単独運転系統構成方法 |
WO2023145465A1 (ja) * | 2022-01-28 | 2023-08-03 | 株式会社デンソー | 車載電源システム |
Also Published As
Publication number | Publication date |
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ES2620253T3 (es) | 2017-06-28 |
EP2608341A1 (en) | 2013-06-26 |
JP5542942B2 (ja) | 2014-07-09 |
US9257829B2 (en) | 2016-02-09 |
JPWO2012023209A1 (ja) | 2013-10-28 |
EP2608341A4 (en) | 2014-04-02 |
CN103081268B (zh) | 2016-01-20 |
US20130163133A1 (en) | 2013-06-27 |
CN103081268A (zh) | 2013-05-01 |
EP2608341B1 (en) | 2017-01-04 |
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