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公开(公告)号：US09876362B2
公开(公告)日：2018-01-23
申请号：US14250656
申请日：2014-04-11
Applicant: MURATA MANUFACTURING CO., LTD.
Inventor： Keiichi Ichikawa , Shinji Goma , Tsuyoshi Suesada , Henri Bondar
Abstract: A capacitance (Cp) is a capacitance formed between a transmitting-device-side passive electrode and a receiving-device-side passive electrode. A capacitance (Ca) is a capacitance formed between a transmitting-device-side active electrode and a receiving-device-side active electrode. A bridge circuit formed by Z1 to Z4 is connected to a secondary side of a step-up transformer, where Z1 represents an impedance of a first element, Z2 represents an impedance of a second element, Z3 represents an impedance of a series circuit formed by the capacitance (Ca) and a load, and Z4 represents an impedance of the capacitance (Cp). By determining the impedances Z1 to Z4 such that this bridge circuit is balanced, a potential at a receiving-device-side reference potential point is made equal to a ground potential. This reduces variation in receiving-device-side reference potential, reduces noise, and stabilizes the operation of a load circuit on the receiving device side.
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公开(公告)号：US09853460B2
公开(公告)日：2017-12-26
申请号：US14944771
申请日：2015-11-18
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Keiichi Ichikawa , Tatsuya Hosotani
CPC classification number: H02J5/005 , H02J7/025 , H02J50/05 , H02J50/12 , H02M3/158 , H02M3/1582 , H02M3/1584 , H02M3/33584 , H02M2001/0074
Abstract: A power conversion circuit includes multiple input-side capacitors connected in series between input terminals; series circuits composed of high-side switching elements and low-side switching elements connected in parallel to the multiple input-side capacitors; and output-side capacitors connected between nodes and a node. The circuit further includes an output-side inductor connected to the node and a controller that alternately turns on and off the high-side switching elements and the low-side switching elements. Each of the low-side switching elements and the high-side switching elements is a MOSFET and causes current to flow from the low side to the high side using a body diode. Accordingly, there is provided a power conversion circuit that has high conversion efficiency and that is capable of realizing reduction in size, a power transmission system, and a power conversion system.
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公开(公告)号：US09846183B2
公开(公告)日：2017-12-19
申请号：US14744089
申请日：2015-06-19
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Keiichi Ichikawa
CPC classification number: G01R21/07 , G01R23/07 , G01R27/02 , G01R27/18 , H02J5/005 , H02J7/025 , H02J50/05 , H04B5/0037
Abstract: A method for determining parameters of a wireless power transmission system is disclosed where the wireless power transmission system transmits power from a power transmission device to a power reception device via electric field coupling. The parameters include a coupling coefficient ke of an electric field coupling unit that is formed of active electrodes and passive electrodes of the power transmission device and the power reception device.
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公开(公告)号：US09755460B2
公开(公告)日：2017-09-05
申请号：US14228927
申请日：2014-03-28
Applicant: MURATA MANUFACTURING CO., LTD.
Inventor： Satoshi Shinoda , Keiichi Ichikawa
CPC classification number: H02J50/80 , H02J5/005 , H02J7/0044 , H02J7/025 , H02J17/00 , H02J50/05 , H04B5/0012 , H04B5/0031 , H04B5/0037 , H04B5/0081
Abstract: A mobile terminal device performs short range communication with an R/W device and receives power from a power transmission device. The mobile terminal device includes a coil antenna, an RFID IC circuit that performs short range communication with the outside via the coil antenna, a charging circuit that receives power received by the coil antenna which is capacitively coupled with a passive electrode and switches that switch to a short range communication state in which short range communication is performed via the coil antenna or a power reception state in which power is received via the coil antenna. Accordingly, a power reception device, a power transmission device and a wireless power transmission system are provided with which wireless power transmission can be realized without obstructing size reduction by giving a single member two functions.
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公开(公告)号：US09531216B2
公开(公告)日：2016-12-27
申请号：US14017698
申请日：2013-09-04
Applicant: MURATA MANUFACTURING CO., LTD.
Inventor： Keiichi Ichikawa
CPC classification number: H02J50/05 , H02J5/005 , H02J7/025 , H02J17/00 , H02J50/00 , H02J50/10 , H02J50/80 , H04B5/0012 , H04B5/0037
Abstract: A piezoelectric transformer includes capacitance elements, an inductance element, a resistance, and an ideal transformer. A first resonance circuit includes the piezoelectric transformer, the capacitance of a capacitance element of a coupling electrode of a power receiving apparatus, and the capacitance of a capacitance element of a coupling electrode of a power transmitting apparatus. On the other hand, a second resonance circuit includes an equivalent output capacitance of the piezoelectric transformer and an inductance element. The frequency of a high-frequency high voltage that is generated by a high-frequency high-voltage generating circuit is set to a value between two resonance frequencies generated by a complex resonance of the first resonance circuit and the second resonance circuit.
Abstract translation: 压电变压器包括电容元件，电感元件，电阻和理想变压器。 第一谐振电路包括压电变压器，电力接收装置的耦合电极的电容元件的电容和电力传输装置的耦合电极的电容元件的电容。 另一方面，第二谐振电路包括压电变压器的等效输出电容和电感元件。 由高频高压发生电路产生的高频高压的频率被设定为由第一谐振电路和第二谐振电路的复共振产生的两个谐振频率之间的值。
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Patent Agency Ranking
公开(公告)号：US09461507B2
公开(公告)日：2016-10-04
申请号：US14189357
申请日：2014-02-25
Applicant: MURATA MANUFACTURING CO., LTD.
Inventor： Hironobu Takahashi , Keiichi Ichikawa , Tsutomu Ieki
Abstract: A power transmitting apparatus includes an active electrode, a passive electrode, a voltage generating circuit that applies a voltage between the active electrode and the passive electrode, and a reference potential electrode connected to a reference potential. A power receiving apparatus includes an active electrode, a passive electrode, a secondary battery connected between the active electrode and the passive electrode, and a reference potential electrode connected to a reference potential. Power is transmitted from the power transmitting apparatus to the power receiving apparatus as a result of the respective electrodes facing each other and being capacitively coupled to each other when the power receiving apparatus is mounted to the power transmitting apparatus.
Abstract translation: 电力传输装置包括有源电极，无源电极，在有源电极和被动电极之间施加电压的电压产生电路和连接到参考电位的参考电位电极。 电力接收装置包括有源电极，无源电极，连接在有源电极和被动电极之间的二次电池以及连接到参考电位的参考电位电极。 由于各个电极彼此面对，并且当电力接收装置安装到电力传输装置时，电力从电力传输装置传送到电力接收装置并且彼此电容耦合。
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公开(公告)号：US20160252553A1
公开(公告)日：2016-09-01
申请号：US15134844
申请日：2016-04-21
Applicant: Murata Manufacturing Co., Ltd.
Inventor： SHINJI GOMA , Keiichi Ichikawa
CPC classification number: G01R23/04 , G01R23/16 , G01R29/0878 , H02J7/0054 , H02J7/025 , H02J50/05 , H02J50/10 , H02J50/70
Abstract: A power transmission-side measurement tool is installed in a power transmitting apparatus that applies an AC voltage stepped up by a step-up transformer to an active electrode and a passive electrode. The power transmission-side measurement tool includes a measurement active electrode that faces the active electrode and a measurement passive electrode that faces the passive electrode, and the measurement active electrode and measurement passive electrode are shorted together. Frequency characteristics of a serial resonance circuit formed by leakage inductance of the step-up transformer and capacitors are measured in a state where the power transmission-side measurement tool is placed on the power transmitting apparatus.
Abstract translation: 电力传输侧测量工具安装在将由升压变压器升压的交流电压施加到有源电极和被动电极的电力传输装置中。 电力传输侧测量工具包括面向有源电极的测量有源电极和面向无源电极的测量无源电极，测量有源电极和测量被动电极短路在一起。 在电力传输侧测量工具放置在电力传输装置上的状态下测量由升压变压器和电容器的漏电感形成的串联谐振电路的频率特性。
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公开(公告)号：US20160126754A1
公开(公告)日：2016-05-05
申请号：US14993193
申请日：2016-01-12
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Keiichi Ichikawa , Tsuyoshi Suesada , Henri Bondar , Hironobu Takahashi
IPC: H02J5/00
Abstract: A power transmission system is disclosed in which power is transmitted from a power transmission apparatus to a power receiving apparatus by electric field coupling between active and passive electrodes. The power transmission apparatus includes a step-up/down circuit for stepping up or down a direct voltage and an inverter circuit for converting the direct voltage into an alternating voltage that is output to the active and passive electrodes. The power transmission apparatus controls the step-up/down circuit to sweep a transformation ratio M=Vo1/Vin and detects the ratio M when an input power Pin of the step-up/down circuit is a minimum. The power transmission apparatus drives the step-up/down circuit to obtain the ratio M and perform the power transmission. As a result, there is provided a power transmission system capable of efficiently performing power transmission regardless of the change in a load in the power receiving apparatus.
Abstract translation: 公开了一种电力传输系统，其中通过有源和无源电极之间的电场耦合将电力从电力传输装置传输到电力接收装置。 电力传输装置包括用于升压或降低直流电压的升压/降压电路和用于将直流电压转换成输出到有源和无源电极的交流电压的逆变器电路。 电力传输装置控制升压/降压电路以扫描变换比M = Vo1 / Vin，并且当升压/降压电路的输入功率Pin为最小时检测比率M. 电力传输装置驱动升压/降压电路以获得比率M并执行电力传输。 结果，提供了能够有效地执行电力传输的电力传输系统，而与电力接收装置中的负载的变化无关。
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公开(公告)号：US10938244B2
公开(公告)日：2021-03-02
申请号：US16426242
申请日：2019-05-30
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Yosuke Kawanami , Keiichi Ichikawa , Tsuyoshi Suesada
Abstract: A first power transfer circuit in a first power transfer apparatus and a second power transfer circuit in a second power transfer apparatus are configured to be electrically symmetrical to each other. In transfer of electric power from one of the first and second power transfer apparatuses to the other of the first and second power transfer apparatuses, a controller drives a first switching circuit and a second switching circuit using a parallel resonant frequency of a complex resonant circuit as a reference frequency of an operating frequency. The controller changes the operating frequency to a frequency higher than the reference frequency or a frequency lower than the reference frequency if a duty ratio is maximized when transmitted electric power is lower than target electric power, which is a control target value, during the driving at the reference frequency.
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公开(公告)号：US20190280529A1
公开(公告)日：2019-09-12
申请号：US16426242
申请日：2019-05-30
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Yosuke Kawanami , Keiichi Ichikawa , Tsuyoshi Suesada
Abstract: A first power transfer circuit in a first power transfer apparatus and a second power transfer circuit in a second power transfer apparatus are configured to be electrically symmetrical to each other. In transfer of electric power from one of the first and second power transfer apparatuses to the other of the first and second power transfer apparatuses, a controller drives a first switching circuit and a second switching circuit using a parallel resonant frequency of a complex resonant circuit as a reference frequency of an operating frequency. The controller changes the operating frequency to a frequency higher than the reference frequency or a frequency lower than the reference frequency if a duty ratio is maximized when transmitted electric power is lower than target electric power, which is a control target value, during the driving at the reference frequency.
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