WO2012081129A1 - 突入電流抑制装置 - Google Patents
突入電流抑制装置 Download PDFInfo
- Publication number
- WO2012081129A1 WO2012081129A1 PCT/JP2010/072816 JP2010072816W WO2012081129A1 WO 2012081129 A1 WO2012081129 A1 WO 2012081129A1 JP 2010072816 W JP2010072816 W JP 2010072816W WO 2012081129 A1 WO2012081129 A1 WO 2012081129A1
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- WIPO (PCT)
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- magnetic flux
- power supply
- inrush current
- supply voltage
- residual magnetic
- Prior art date
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F5/00—Systems for regulating electric variables by detecting deviations in the electric input to the system and thereby controlling a device within the system to obtain a regulated output
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
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- 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
- H02H7/04—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 transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/001—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off
- H02H9/002—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off limiting inrush current on switching on of inductive loads subjected to remanence, e.g. transformers
Definitions
- the present invention relates to an inrush current suppressing device.
- the present invention has been made in view of the above, and an object thereof is to provide an inrush current suppressing device capable of suppressing an exciting inrush current that may occur due to a mismatch between a residual magnetic flux and a steady magnetic flux.
- the inrush current suppressing device is applied to a configuration in which a circuit breaker is connected between a power source and a transformer, and is used for closing operation of the transformer.
- An inrush current suppressing device for suppressing an energizing inrush current a power supply voltage measuring unit for measuring a power supply voltage on the power supply side of the circuit breaker, a breaking characteristic in the opening process of the circuit breaker, and the current after breaking the current Remaining magnetic flux attenuation characteristics of the transformer, a current interruption magnetic flux value is calculated based on the power supply voltage and the interruption characteristic, and a residual magnetic flux value is calculated based on the current interruption magnetic flux value and the attenuation characteristic
- a magnetic flux calculation unit, a closing phase calculation unit that calculates a power supply voltage phase in which the residual magnetic flux value and the steady magnetic flux value at the time of application of the power supply voltage coincide with each other, and sets the input power supply voltage phase;
- the breaker is characterized in that it
- FIG. 1 is a diagram illustrating an example of the inrush current suppressing device according to the first embodiment.
- FIG. 2 is a diagram illustrating an example of the closing phase control in the inrush current suppressing device according to the first embodiment.
- FIG. 3 is a diagram illustrating an example in which the power supply voltage phase is the same as the power supply voltage phase when the circuit breaker is opened as a comparison with the closing phase control according to the first embodiment.
- FIG. 4 is a diagram illustrating an example of a magnetic flux value conversion table according to the second embodiment.
- FIG. 1 is a diagram illustrating an example of the inrush current suppressing device according to the first embodiment.
- a circuit breaker 1 is connected between each phase power source (not shown) composed of R phase, S phase and T phase on the right side of the figure and a transformer 30 on the left side of the figure.
- the circuit breaker 1 includes switches 2, 3, and 4 for each phase, and can open and close the switches 2, 3, and 4 simultaneously or independently. Each switch 2, 3, 4 is closed during normal operation, and power is supplied to the transformer 30. Further, when some accident occurs or during maintenance inspection, the switches 2, 3 and 4 are opened, and the power supply to the transformer 30 is cut off.
- the transformer 30 is a three-phase transformer connected by Y- ⁇ connection, and specifically, a three-phase primary winding 31 that is star-connected and the neutral point is opened. And a three-phase secondary winding 32 connected in a triangular manner.
- the three input terminals of the three-phase primary winding 31 are connected to the respective phase power sources via the switches 2, 3 and 4, respectively, and the three output terminals of the three-phase secondary winding 32 are connected to a load (see FIG. (Not shown).
- a power supply voltage detection unit 60 that detects each phase power supply voltage is connected to the power supply side terminals of the switches 2, 3, and 4, and a detection signal is output to the inrush current suppression device 50.
- the inrush current suppression device 50 is configured by, for example, a computer and includes a power supply voltage measurement unit 54, a residual magnetic flux calculation unit 51, a closing phase calculation unit 52, and a control unit 53.
- the power supply voltage measurement unit 54 continuously measures the instantaneous value of each phase power supply voltage based on the detection signal from the power supply voltage detection unit 60 and outputs the instantaneous value to the residual magnetic flux calculation unit 51 and the control unit 53.
- the power supply voltage detection unit 60 and the power supply voltage measurement unit 54 are described as different components, and the inrush current suppression device 50 is described as not including the power supply voltage detection unit 60.
- the power supply voltage detection unit 60 may be included in the inrush current suppression device 50, and the power supply voltage measurement unit 54 may have the function of the power supply voltage detection unit 60.
- the residual magnetic flux calculation unit 51 obtains the power supply voltage phase at the time of current interruption from the input time of the opening command signal 20, and calculates the residual magnetic flux value from the magnetic flux value at the obtained power supply voltage phase. A method for calculating the residual magnetic flux value will be described later.
- the closing phase calculation unit 52 calculates a power supply voltage phase at which the residual magnetic flux calculated by the residual magnetic flux calculation unit 51 matches the steady magnetic flux when the power supply voltage is applied.
- the control unit 53 controls opening of the switches 2, 3, and 4 of the circuit breaker 1 based on the opening command signal 20 and is calculated by the closing phase calculation unit 52 based on the closing command signal 25.
- the switches 2, 3 and 4 of the circuit breaker 1 are controlled to be closed so that they are turned on at the power supply voltage phase.
- each switch 2, 3, 4 being closed means that each contact of each switch 2, 3, 4 is in mechanical contact, and the control unit 53 closes each switch 2, 3, 4.
- a predetermined time from the control until the switches 2, 3, and 4 are actually closed is called a closing time.
- an arc current starts to flow (pre-arc) before the switches 2, 3, and 4 are closed.
- Turning on each switch 2, 3 and 4 means that an arc current caused by a pre-arc is caused to flow through each switch 2, 3 and 4.
- the predetermined time until the switches 2, 3 and 4 are turned on is referred to as a turn-on time.
- This charging time is determined by the inter-dielectric strength change rate (RDDS) characteristic in the closing process of the circuit breaker 1.
- RDDS inter-dielectric strength change rate
- opening each switch 2, 3, 4 means that the contacts of each switch 2, 3, 4 are mechanically separated, and the control unit 53 opens each switch 2, 3, 4.
- a predetermined time from when the control is performed until the switches 2, 3, and 4 are actually opened is referred to as an opening time.
- an arc current flows for a predetermined time even when the switches 2, 3, and 4 are mechanically opened.
- To shut off each of the switches 2, 3 and 4 means to extinguish the arc current flowing through each of the switches 2, 3 and 4, and after the control unit 53 performs the opening control of each of the switches 2, 3 and 4.
- the predetermined time until the switches 2, 3 and 4 are actually interrupted is called arc time.
- This arc time is determined by an inter-dielectric strength change rate (RRDS) characteristic in the opening process of the circuit breaker 1.
- RRDS inter-dielectric strength change rate
- control unit 53 considers the above-described closing time, closing time, opening time, and arc time, and opens the switches 2, 3 and 4 of the circuit breaker 1 for each phase or for each phase individually. Perform control and closing control.
- FIG. 2 is a diagram illustrating an example of the closing phase control in the inrush current suppressing device according to the first embodiment.
- FIG. 2A shows a power supply voltage waveform for one phase normalized by setting the maximum value of the power supply voltage to 1.
- FIG. 2B shows the magnetic flux waveform of the phase corresponding to FIG. 2A normalized with the maximum value of the magnetic flux being 1.
- the waveform shown with the broken line in FIG.2 (b) has shown the theoretical value waveform of the stationary magnetic flux at the time of application of a power supply voltage.
- the change in the magnetic flux is the same as the steady magnetic flux at the arc time t from when the switches 2, 3 and 4 of the circuit breaker 1 are opened at time T1 until the current is interrupted at time T2.
- the magnetic flux after the current interruption (time T2) is charged and discharged by the characteristics of the iron core material of the transformer 30, the relative ground capacity of the transformer 30 and the inter-electrode capacity of the switches 2, 3 and 4, etc. It attenuates ( ⁇ ) from the magnetic flux value ⁇ 0 (hereinafter referred to as “magnetic flux value at the time of current interruption”) at the time of current interruption (time T2), and eventually becomes a constant residual magnetic flux value ⁇ r.
- Such characteristics are hereinafter referred to as “attenuation characteristics”. That is, the residual magnetic flux value ⁇ r can be obtained by preliminarily estimating and obtaining this attenuation characteristic by actual measurement or analysis and applying it to the current interruption magnetic flux value ⁇ 0.
- FIG. 3 is a diagram showing an example in which the power supply voltage phase is the same as the power supply voltage phase when the circuit breaker is opened as a comparison with the closing phase control according to the first embodiment.
- FIG. 3A shows a power supply voltage waveform for one phase normalized with the maximum value of the power supply voltage being 1.
- FIG. 3B shows the magnetic flux waveform of the phase corresponding to FIG. 3A normalized with the maximum value of the magnetic flux being 1.
- the waveform shown with the broken line in FIG.3 (b) has shown the theoretical value waveform of the stationary magnetic flux at the time of application of a power supply voltage.
- the attenuation of the residual magnetic flux after the current interruption (T2) is not taken into consideration and the power supply voltage phase is the same as the power supply voltage phase when the circuit breaker is opened (T1) (time T3 ′). ).
- the magnetic flux after application does not coincide with the steady magnetic flux, a magnetic flux transient occurs, magnetic saturation of the transformer core occurs, and an excitation inrush current corresponding to the magnitude flows.
- the controller 53 controls opening of the switches 2, 3 and 4 of the circuit breaker 1.
- the contacts of the switches 2, 3 and 4 are opened at time T1 in the figure after the opening time has elapsed, and are cut off at time T2 after the arc time t has elapsed.
- the residual magnetic flux calculation unit 51 holds in advance the breaking characteristics of the circuit breaker 1 (that is, the inter-dielectric strength change rate (RRDS) characteristics in the opening process of the circuit breaker 1), and the arc time based on the breaking characteristics. t is calculated to determine the cutoff time T2, and the power supply voltage phase at the cutoff time T2 is determined. In addition, the interruption
- RRDS inter-dielectric strength change rate
- the residual magnetic flux calculation unit 51 obtains the current interruption magnetic flux value ⁇ 0 in the power supply voltage phase at the interruption time T2, and from the current interruption magnetic flux value ⁇ 0, for example, according to the residual magnetic flux calculation expression shown in the following equation (1).
- a residual magnetic flux value ⁇ r is obtained.
- k represents a magnetic flux attenuation coefficient, and is determined by the characteristics of the iron core material of the transformer 30, the relative ground capacity of the transformer 30, the interpolar capacity of the switches 2, 3, and 4 and the like. It is a value and can be arbitrarily set within the range of 0 ⁇ k ⁇ 1. That is, in the residual magnetic flux calculation unit 51 according to the first embodiment, the attenuation coefficient k is held as the above-described attenuation characteristic, and the residual magnetic flux value is calculated by the residual magnetic flux calculation formula shown in the formula (1). Note that the attenuation coefficient k is set to a value obtained by estimation in advance by actual measurement or analysis during actual operation.
- the input phase calculation unit 52 obtains the power supply voltage phase ( ⁇ 1, ⁇ 2) in which the residual magnetic flux value ⁇ r and the theoretical value waveform of the steady magnetic flux coincide with each other and outputs it to the control unit 53.
- the control unit 53 receives each switch 2 of the circuit breaker 1 at time T3 when the applied power supply voltage phase (power supply voltage phase ⁇ 1 or ⁇ 2) is input from the input phase calculation unit 52.
- the closing control is performed so that 3 and 4 are inserted.
- the breaking characteristics and the magnetic flux attenuation coefficient in the opening process of the circuit breaker estimated in advance by actual measurement or analysis are retained,
- the residual magnetic flux value is calculated by applying a damping coefficient to the magnetic flux value at the time of current interruption obtained based on the interruption characteristics of the current, and the circuit breaker is turned on at the power supply voltage phase where the calculated residual magnetic flux value matches the theoretical value of the steady magnetic flux.
- the residual magnetic flux value is obtained by applying the attenuation coefficient to the magnetic flux value at the time of current interruption.
- the magnetic flux value obtained by comparing the magnetic flux value at the time of current interruption and the residual magnetic flux value An example in which a conversion table is held and the residual magnetic flux value corresponding to the magnetic flux value at the time of current interruption is read from the magnetic flux value conversion table will be described.
- description is abbreviate
- the operation of the components other than the residual magnetic flux calculation unit 51 is the same as that of the first embodiment, the description thereof is omitted here.
- FIG. 4 is a diagram illustrating an example of a magnetic flux value conversion table according to the second embodiment.
- the residual magnetic flux calculation unit 51 in the second embodiment holds a magnetic flux value conversion table as shown in FIG. 4, for example, instead of the attenuation coefficient k and the residual magnetic flux calculation formula as the attenuation characteristics described in the first embodiment. Yes.
- FIG. 4 the example which tabulated the magnetic flux value ratio at the time of current interruption with respect to the maximum value of magnetic flux and the residual magnetic flux value ratio with respect to the maximum value of magnetic flux is shown.
- the residual magnetic flux calculation unit 51 holds the breaking characteristic of the circuit breaker 1 in advance, calculates the arc time t based on this breaking characteristic, and cuts off time T2. And the power supply voltage phase at the cutoff time T2 is obtained.
- the current interruption magnetic flux value ⁇ 0 in the power supply voltage phase at the interruption time T2 is obtained, the ratio of the current interruption magnetic flux value ⁇ 0 to the maximum magnetic flux value is calculated, and the magnetic flux value conversion table shown in FIG.
- the ratio of the residual magnetic flux value ⁇ r corresponding to the ratio of the magnetic flux value ⁇ 0 at the time of current interruption to the maximum value of the magnetic flux is read to obtain the residual magnetic flux value ⁇ r.
- This magnetic flux value conversion table can be obtained by estimation in advance by actual measurement, analysis, or the like, similarly to the attenuation coefficient k described in the first embodiment.
- the breaking characteristics and the current breaking magnetic flux in the opening process of the circuit breaker estimated in advance by actual measurement or analysis or the like. Holding a magnetic flux value conversion table in which the value and the residual magnetic flux value are compared, and calculating a residual magnetic flux value corresponding to the current interruption magnetic flux value obtained from the breaking characteristics of the circuit breaker from the magnetic flux value conversion table, Since the circuit breaker is turned on at a phase where the calculated residual magnetic flux value and the theoretical value of the steady magnetic flux match, similar to the first embodiment, excitation that may occur due to the mismatch between the residual magnetic flux and the steady magnetic flux Inrush current can be suppressed.
- each phase has three homology.
- the present invention can be applied at any time or when each phase is added individually.
- the inrush current suppressing device is useful as an invention that can suppress the magnetizing inrush current that may occur due to the mismatch between the residual magnetic flux and the steady magnetic flux.
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- Electromagnetism (AREA)
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- Radar, Positioning & Navigation (AREA)
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
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Abstract
Description
図1は、実施の形態1にかかる突入電流抑制装置の一例を示す図である。図1において、遮断器1は、同図右方側のR相、S相、T相からなる各相電源(図示せず)と、同図左方側の変圧器30との間に接続されている。この遮断器1は、各相毎に各スイッチ2,3,4を具備し、各スイッチ2,3,4を同時に、あるいは独立して開閉動作させることが可能である。各スイッチ2,3,4は、通常動作時には閉極され、変圧器30に電力供給が行われる。また、何らかの事故が発生した場合、あるいは保守点検時などには、各スイッチ2,3,4が開極され、変圧器30への電力供給が遮断される。
実施の形態1では、電流遮断時磁束値に減衰係数を適用して残留磁束値を求めるようにしたが、本実施の形態では、電流遮断時磁束値と残留磁束値とを対比させた磁束値変換テーブルを保持しておき、その磁束値変換テーブルから電流遮断時磁束値に対応する残留磁束値を読み取る例について説明する。なお、実施の形態2にかかる突入電流抑制装置の構成は、実施の形態1において説明した図1の構成と同一であるので、ここでは説明を省略する。また、残留磁束演算部51以外の構成部の動作は、実施の形態1と同一であるので、ここでは説明を省略する。
2~4 スイッチ
20 開極指令信号
25 閉極指令信号
30 変圧器
31 三相一次巻線
32 三相二次巻線
50 突入電流抑制装置
51 残留磁束演算部
52 投入位相演算部
53 制御部
54 電源電圧測定部
60 電源電圧検出部
Claims (5)
- 電源と変圧器との間に遮断器が接続される構成に適用され、前記変圧器の閉極動作に伴う励磁突入電流を抑制する突入電流抑制装置であって、
前記遮断器の前記電源側における電源電圧を測定する電源電圧測定部と、
前記遮断器の開極過程における遮断特性および電流遮断後における前記変圧器の磁束の減衰特性を保持し、前記電源電圧および前記遮断特性に基づいて電流遮断時磁束値を算出し、前記電流遮断時磁束値および前記減衰特性に基づいて残留磁束値を算出する残留磁束演算部と、
前記残留磁束値と前記電源電圧の印加時における定常磁束値とが一致する電源電圧位相を算出して投入電源電圧位相とする投入位相演算部と、
前記投入電源電圧位相において前記遮断器が投入されるように閉極制御する制御部と、
を備えることを特徴とする突入電流抑制装置。 - 前記残留磁束演算部は、前記減衰特性として、前記電流遮断時磁束値に適用する減衰係数を保持し、前記電流遮断時磁束値に前記減衰係数を適用する残留磁束演算式により前記残流磁束値を算出することを特徴とする請求項1に記載の突入電流抑制装置。
- 前記残留磁束演算部は、前記減衰特性として、前記電流遮断時磁束値と前記残留磁束値とを対比させた磁束値変換テーブルを保持し、前記電流遮断時磁束値に対応する前記残流磁束値を前記磁束値変換テーブルから読み取って得ることを特徴とする請求項1に記載の突入電流抑制装置。
- 前記残留磁束演算部は、突入電流抑制装置が適用される前記電源、前記遮断器、および前記変圧器を含む構成において実測して得た前記減衰特性を保持することを特徴とする請求項1に記載の突入電流抑制装置。
- 前記残留磁束演算部は、突入電流抑制装置が適用される前記電源、前記遮断器、および前記変圧器を含む構成における解析結果から推定した前記減衰特性を保持することを特徴とする請求項1に記載の突入電流抑制装置。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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EP10860886.0A EP2654060B1 (en) | 2010-12-17 | 2010-12-17 | Inrush current suppression device |
PCT/JP2010/072816 WO2012081129A1 (ja) | 2010-12-17 | 2010-12-17 | 突入電流抑制装置 |
US13/877,756 US9170597B2 (en) | 2010-12-17 | 2010-12-17 | Inrush current suppressing device |
CN201080069827.8A CN103180926B (zh) | 2010-12-17 | 2010-12-17 | 浪涌电流抑制装置 |
JP2011511547A JP4762378B1 (ja) | 2010-12-17 | 2010-12-17 | 突入電流抑制装置 |
CA2815464A CA2815464C (en) | 2010-12-17 | 2010-12-17 | Inrush current suppressing device |
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PCT/JP2010/072816 WO2012081129A1 (ja) | 2010-12-17 | 2010-12-17 | 突入電流抑制装置 |
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US (1) | US9170597B2 (ja) |
EP (1) | EP2654060B1 (ja) |
JP (1) | JP4762378B1 (ja) |
CN (1) | CN103180926B (ja) |
CA (1) | CA2815464C (ja) |
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JP2022553725A (ja) * | 2019-10-25 | 2022-12-26 | ヒタチ・エナジー・スウィツァーランド・アクチェンゲゼルシャフト | 結合負荷の制御されたスイッチングのための方法および装置 |
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JP5908336B2 (ja) * | 2012-05-08 | 2016-04-26 | 株式会社東芝 | 励磁突入電流抑制装置及び励磁突入電流抑制方法 |
CN103701110B (zh) * | 2014-01-10 | 2016-05-11 | 国家电网公司 | 一种基于交流消磁法的励磁涌流抑制方法 |
JP5769901B1 (ja) * | 2014-06-09 | 2015-08-26 | 三菱電機株式会社 | 位相制御装置 |
WO2017188489A1 (ko) * | 2016-04-26 | 2017-11-02 | 주식회사 모스트파워 | 위상 오프 제어를 위한 유도성 킥백 전압 제거 장치 |
CN108390377A (zh) * | 2018-04-25 | 2018-08-10 | 深圳市禾望电气股份有限公司 | 一种岸基供电系统及减小励磁涌流的方法 |
CN113325345B (zh) * | 2021-06-02 | 2024-04-09 | 云南电网有限责任公司电力科学研究院 | 一种对变压器铁芯剩磁进行测试的装置及方法 |
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- 2010-12-17 EP EP10860886.0A patent/EP2654060B1/en active Active
- 2010-12-17 CN CN201080069827.8A patent/CN103180926B/zh not_active Expired - Fee Related
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JP2022553725A (ja) * | 2019-10-25 | 2022-12-26 | ヒタチ・エナジー・スウィツァーランド・アクチェンゲゼルシャフト | 結合負荷の制御されたスイッチングのための方法および装置 |
JP7437581B2 (ja) | 2019-10-25 | 2024-02-26 | ヒタチ・エナジー・リミテッド | 結合負荷の制御されたスイッチングのための方法および装置 |
Also Published As
Publication number | Publication date |
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CA2815464C (en) | 2016-05-10 |
EP2654060A4 (en) | 2016-10-19 |
EP2654060B1 (en) | 2017-09-06 |
US20130193946A1 (en) | 2013-08-01 |
CN103180926B (zh) | 2015-11-25 |
CA2815464A1 (en) | 2012-06-21 |
EP2654060A1 (en) | 2013-10-23 |
CN103180926A (zh) | 2013-06-26 |
US9170597B2 (en) | 2015-10-27 |
JP4762378B1 (ja) | 2011-08-31 |
JPWO2012081129A1 (ja) | 2014-05-22 |
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