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公开(公告)号：US20250038575A1
公开(公告)日：2025-01-30
申请号：US18911821
申请日：2024-10-10
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koyo KAIWA , Tatsuya HOSOTANI
Abstract: A wireless power receiving device includes power receiving coils, power receiving resonance circuits, and rectifier circuits. The power receiving coils each generate a power receiving current by being coupled to an external magnetic field. Each power receiving resonance circuit includes a power receiving coil and a capacitor. The rectifier circuits are connected to the power receiving resonance circuits and rectify resonance currents, respectively. The power receiving coils are planar spiral coils, and the power receiving coils are cylindrical solenoid coils. The power receiving coils and the power receiving coils are disposed in a state where a direction orthogonal to a plane of the spiral coil and axes of cylindrical shapes of the solenoid coils are not parallel to each other. A power adding circuit adds DC outputs of the rectifier circuits at a subsequent stage of the rectifier circuits and supplies power to a load.
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公开(公告)号：US20240250428A1
公开(公告)日：2024-07-25
申请号：US18587266
申请日：2024-02-26
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Takahiro NAGAI , Tatsuya HOSOTANI
Abstract: A ring-type device includes a wireless power receiver circuit, a radio communication circuit, and a ring-shaped structure. The wireless power receiver circuit includes a power receiver circuit, and a loop coil. The radio communication circuit operates with the loop coil serving as an antenna. The power receiver circuit and the radio communication circuit include an electronic component, and a flexible circuit board to which the electronic component is mounted. The ring-shaped structure has a lateral ring face, a top ring face, and a bottom ring face. The loop coil is disposed along the top ring face. The flexible circuit board is planar in structure in its developed condition, and is disposed in a curved configuration along the lateral ring face of the ring-shaped structure.
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公开(公告)号：US20240136926A1
公开(公告)日：2024-04-25
申请号：US18403297
申请日：2024-01-03
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Tatsuya HOSOTANI , Hiroyuki TAKATSUJI , Yuki ISHIKURA
Abstract: A noise reduction circuit includes a surface-mount common mode choke coil mounted on a circuit board. Output terminals of the common mode choke coil are connected to an input capacitor via second circuit patterns. Two terminals of the input capacitor are connected to two input ends of a switching circuit via third circuit patterns. Path lengths of the second circuit patterns are longer than path lengths of the third circuit patterns. Of a plurality of current paths, the path lengths of the third circuit patterns are shortest in comparison with path lengths of other current paths. First circuit patterns are parallel and face each other to form a first parasitic capacitance, and the second circuit patterns are parallel and face each other to form second parasitic capacitances.
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公开(公告)号：US20230268774A1
公开(公告)日：2023-08-24
申请号：US18307073
申请日：2023-04-26
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Koyo KAIWA , Tatsuya HOSOTANI , Takahiro NAGAI
CPC classification number: H02J50/12 , H02J50/80 , H02M3/33571 , H02M3/33573 , H04B5/0037
Abstract: A magnetic coupling coefficient between a power reception coil and a communication antenna is 0.3 or less. A power management circuit suppresses electromagnetic interference between the power reception coil and the communication antenna in a predetermined time period by causing a rectification stopping circuit to operate to keep the rectification stopping circuit in an operation state in the predetermined time period with a received power voltage exceeding a first threshold value and by changing a resonant frequency of a power reception resonant circuit to a frequency different from a frequency being used in a wireless communication circuit to keep the resonant frequency in a changed state.
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公开(公告)号：US20220321172A1
公开(公告)日：2022-10-06
申请号：US17846852
申请日：2022-06-22
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Tatsuya HOSOTANI , Takahiro NAGAI
IPC: H04B5/00
Abstract: A near-field communication device includes a communication antenna for near-field communication formed along a plane, an interface circuit connected to the communication antenna for making a signal of the near-field communication pass through the interface circuit, a wireless communication IC connected to the interface circuit for processing the signal of the near-field communication, a power reception coil arranged along the plane to surround the communication antenna, a resonant capacitor constituting, together with the power reception coil, a power reception resonant circuit, and a rectifying and smoothing circuit connected to the power reception resonant circuit. The power reception resonant circuit resonates at a frequency of the near-field communication, and magnetic flux generated in the vicinity of the power reception coil by a resonant current flowing through the power reception resonant circuit interlinks with the communication antenna.
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Patent Agency Ranking
公开(公告)号：US20220231348A1
公开(公告)日：2022-07-21
申请号：US17716370
申请日：2022-04-08
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Tatsuya HOSOTANI , Kiyokazu YAMADA
IPC: H01M10/46 , H02J7/00 , H02J50/10 , H02J50/70 , H02H7/18 , H02H7/16 , H01G11/14 , H01M50/202 , H01M50/213 , H01M10/42
Abstract: A secondary battery, a wireless charging circuit connected to the secondary battery, an outer casing member that has an outer shape equivalent to an outer shape of a universal battery and accommodates the secondary battery and the wireless changing circuit, and a positive terminal and a negative terminal that are electrically connected to the secondary battery and are provided at positions corresponding to positions of a positive terminal and a negative terminal, respectively, of the universal battery, are provided. The wireless charging circuit includes a power reception protecting circuit that stops power reception at a rectifier circuit in a case where a received voltage exceeds a predetermined voltage range.
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公开(公告)号：US20210242769A1
公开(公告)日：2021-08-05
申请号：US17238257
申请日：2021-04-23
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Yuki ISHIKURA , Tatsuya HOSOTANI
Abstract: A switching converter includes a controller configured or programmed to detect voltages of snubber capacitors, a voltage of a first capacitor, and a voltage of a second capacitor using voltage sensors. The controller adjusts the turn-off timings of switches based on the voltages of the snubber capacitors, the voltage between terminals of the first capacitor, and the voltage of the second capacitor.
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公开(公告)号：US20210104350A1
公开(公告)日：2021-04-08
申请号：US17125677
申请日：2020-12-17
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Tatsuya HOSOTANI , Osamu MIKI
Abstract: A planar array coil includes a multilayer substrate at which a plurality of coils are formed and arranged on a plane of the multilayer substrate. First ends of the plurality of coils are connected to switching circuit units of a power conversion circuit, and second ends of the plurality of coils are connected to a common output part. The coils include two coil parts in which currents flow in opposite rotation directions, and one coil part of one coil is adjacent to one coil part of another coil. The plurality of coils are connected such that operation of switching circuits causes currents in regions of adjacent coil parts that extend in parallel to each other to flow in the same direction. Accordingly, adverse effects by unwanted coupling between adjacent coils are reduced and a switching power supply device that includes the planar array coil performs stable power conversion operations.
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公开(公告)号：US20190089199A1
公开(公告)日：2019-03-21
申请号：US16192589
申请日：2018-11-15
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Tatsuya HOSOTANI
IPC: H02J50/12
Abstract: A power reception device includes a power reception coil configured to couple with a power transmission coil included in a power transmission device; a rectifier circuit including a diode and a transistor electrically connected to the power reception coil and configured to rectify a high frequency AC current flowing in the power reception coil; outputs configured to output the current rectified by the rectifier circuit to a load; a voltage detection circuit configured to detect an output voltage Va; and a controller configured to control an operation of the transistor based on the output voltage Va. The controller turns off the transistor when the output voltage Va≤the threshold value Va1 is satisfied and causes the rectifier circuit to execute a rated rectification operation, and turns on the transistor when the voltage Va≥the threshold value Va2 is satisfied and stops the rated rectification operation.
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10.发明申请公开(公告)号：US20190074726A1
公开(公告)日：2019-03-07
申请号：US16180993
申请日：2018-11-05
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Tatsuya HOSOTANI
Abstract: A transmitter has a transmitting resonant circuit, a transmitting circuit that supplies high-frequency power to the transmitting resonant circuit, and a demodulator. A receiver has a receiving resonant circuit; a receiving circuit that converts high-frequency power received by the resonant circuit into DC power; a load circuit that consumes the DC power; a resonance modulator that varies an input impedance, viewed toward the load circuit from the transmitting circuit, to switch whether an electromagnetic resonance condition is established; and a transmission-signal controller that converts a transmission signal into a variation pattern, representing a pattern of variation per predetermined time period of the input impedance, to control the resonance modulator. The demodulator detects a variable that varies with whether the electromagnetic resonance condition is established, and demodulates the transmission signal based on a pattern of variation per predetermined time period with respect to temporal variation of the variable.
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