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公开(公告)号：US20230308022A1
公开(公告)日：2023-09-28
申请号：US18188227
申请日：2023-03-22
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Hiroyuki TAKATSUJI , Tatsuya HOSOTANI
CPC classification number: H02M3/33523 , H02M3/158 , H02M1/44
Abstract: A switching power-supply unit includes a power conversion circuit, a control circuit, a common-mode choke coil, and half-bridge capacitors. The common-mode choke coil is connected to the control circuit on its side of a direct-current power supply. The half-bridge capacitor is connected to the power conversion circuit on its side of a direct-current power supply, and is connected to the control circuit on its side of the direct-current power supply. A midway point of the half-bridge capacitor is electrically connected to a midway point of the half-bridge capacitor. A noise balancing circuit is configured as a closed circuit including the power conversion circuit, the control circuit, the half-bridge capacitors, and the common-mode choke coil, and causes common-mode currents to be confined and canceled out each other. The common-mode currents are switching noise generated in multiple parts of the closed circuit due to a switching operation of power-conversion switching devices.
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公开(公告)号：US20230280813A1
公开(公告)日：2023-09-07
申请号：US18315435
申请日：2023-05-10
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Tatsuya HOSOTANI , Kiyokazu YAMADA
IPC: G06F1/3231
CPC classification number: G06F1/3231
Abstract: An electronic card includes an electric storage device, a charging circuit, a wireless communication circuit, a processor, an electronic function circuit, a power management circuit, and a wakeup circuit configured to start the power management circuit upon receiving an external trigger. The power management circuit supplies, after being started by the wakeup circuit, power of the electric storage device to the processor and the electronic function circuit. The processor stores, before the start of wireless communication, an operation state or an output result of the electronic function circuit which is obtained by an operation with power of the electric storage device, and causes, after operation processing of the electronic function circuit, the wireless communication circuit to start the wireless communication.
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公开(公告)号：US20230100463A1
公开(公告)日：2023-03-30
申请号：US18061265
申请日：2022-12-02
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Tatsuya HOSOTANI
IPC: G06K19/073 , H02J50/12 , H02J7/00
Abstract: An electronic card with electronic function circuit includes a communication antenna for short-range wireless communication, a wireless communication IC electrically coupled to the communication antenna, a receiving coil, a resonant capacitor forming a receiving resonant circuit together with the receiving coil, a rectifying and smoothing circuit coupled to the receiving resonant circuit, receiving display elements, a power control unit that controls power from the receiving resonant circuit, and an electronic function circuit that operates by using the power from the receiving resonant circuit. In response to the receiving coil receiving the power, the power control circuit indicates a power receiving state to a user by driving the receiving display elements.
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公开(公告)号：US20230095548A1
公开(公告)日：2023-03-30
申请号：US18061314
申请日：2022-12-02
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Tatsuya HOSOTANI
IPC: G06K19/073
Abstract: An electronic card with biometric authentication function includes a communication antenna for short-range wireless communication, a wireless communication IC, a receiving coil, a resonant capacitor, a rectifying and smoothing circuit, a biometric sensor, and a biometric authentication circuit. The communication antenna and the receiving coil respond to a magnetic field in the same frequency band for the short-range wireless communication. The wireless communication IC performs short-range wireless communication. The receiving coil receives power from the magnetic field in the same frequency band for the short-range wireless communication. The biometric authentication circuit causes the biometric sensor to operate by using the power received from the receiving resonant circuit. The communication antenna and the receiving coil share electromagnetic field energy resonating in the same frequency band for the short-range wireless communication, the electromagnetic field energy being shared because of magnetic coupling between the communication antenna and the receiving coil.
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公开(公告)号：US20230010809A1
公开(公告)日：2023-01-12
申请号：US17933565
申请日：2022-09-20
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Norikazu SAKAMOTO , Osamu MIKI , Tatsuya HOSOTANI
Abstract: A multi-converter power supply system includes a plurality of cell converters, a common node to which an individual output terminal of each of the plurality of cell converters is connected, a current waveform signal generation circuit that generates a current waveform signal corresponding to a current waveform flowing through an individual inductor, and a first instrumentation amplifier that receives input of an individual output voltage signal obtained from the individual output terminal and the current waveform signal and that outputs a signal for comparison with a current common signal shared by a plurality of switching control circuits. The current waveform signal and the individual output voltage signal that are input to the first instrumentation amplifier are formed with reference to a potential of the common node.
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Patent Agency Ranking
公开(公告)号：US20230009649A1
公开(公告)日：2023-01-12
申请号：US17933116
申请日：2022-09-18
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Osamu MIKI , Tatsuya HOSOTANI
IPC: H05K1/02 , H05K1/14 , H05K7/20 , H01L25/16 , H01L23/367
Abstract: A circuit board module includes a first circuit board having a first main surface on which an electronic component that generates heat when the electronic component operates is mounted and a second main surface, a second circuit board having a third main surface on which the first circuit board is mounted and a fourth main surface, and a first thermally-conductive sheet between the first circuit board and the second circuit board. The first circuit board is mounted such that the second main surface faces the third main surface. The first circuit board includes thermally-conductive vias that extend between the first and second main surfaces, the vias being densely distributed in a region near a mounting terminal of the electronic component, filled with a thermally-conductive member, and physically in contact with the first thermally-conductive sheet that covers the third main surface of the second circuit board.
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公开(公告)号：US20220407564A1
公开(公告)日：2022-12-22
申请号：US17860674
申请日：2022-07-08
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Tatsuya HOSOTANI , Takahiro NAGAI
Abstract: A wireless power-receiving device with near field communication function includes a communication antenna on a flat surface for near field communication, an interface circuit connected to the antenna and allowing a signal in the near field communication to pass, a wireless communication IC that is connected to the interface circuit and processes the signal, a receiving coil on the flat surface, a resonant capacitor included, with the receiving coil, in a receiving resonant circuit, and a rectifying/smoothing circuit connected to the receiving resonant circuit. The receiving resonant circuit resonates at a frequency for the near field communication, a resonance current flowing through the receiving resonant circuit causes a current to flow through the coil, a main flux is generated near the coil, and a magnetic path of the main flux is isolated from a magnetic path of a magnetic flux for the near field communication interlinking with the antenna.
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公开(公告)号：US20220383004A1
公开(公告)日：2022-12-01
申请号：US17818530
申请日：2022-08-09
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Takahiro NAGAI , Tatsuya HOSOTANI
IPC: G06K7/10 , H02J50/10 , H02J50/90 , G06K19/07 , G06K19/073
Abstract: An IC card communicates with a reader/writer, which is inductive read/write communication equipment, in a non-contact manner. The IC card includes a proximity detection circuit that detects a proximity state to the reader/writer, a near-field communication circuit, an electronic function circuit, an electricity storage device, and a power supply control circuit. The power supply control circuit controls, based on a detection result of the proximity detection circuit, power supply from the electricity storage device to the electronic function circuit. The IC card manages and controls presence/absence and timing of power supply from the electricity storage device to the electronic function circuit and effectively controls discharging of the electricity storage device and charging of the electricity storage device.
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公开(公告)号：US20220131467A1
公开(公告)日：2022-04-28
申请号：US17647267
申请日：2022-01-06
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Tatsuya HOSOTANI
Abstract: A power supply system includes a plurality of power conversion circuits, each including an inductor and switching elements. A load distribution controller amplifies an inductor current signal input to a current signal terminal, outputs the amplified signal to a common node terminal, and generates an individual feedback signal to be output to a feedback signal adjustment terminal according to an inductor current signal and a voltage of the common node terminal. A switching control circuit controls the switching elements according to the individual feedback signal input to a feedback terminal.
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公开(公告)号：US20210408914A1
公开(公告)日：2021-12-30
申请号：US17470833
申请日：2021-09-09
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Tatsuya HOSOTANI
Abstract: Each of a plurality of power conversion units includes an inductor, a switching circuit, and an individual analog controller. An MPU is capable of performing programmable arithmetic processing and outputs oscillation control signals to the plurality of power conversion circuits. Output parts of the plurality of power conversion units are connected to a common output terminal in a parallel manner, and the common output terminal is connected to a load. The individual analog controller is formed of an analog electronic circuit and includes a feedback signal generating part and a driving part. The feedback signal generating part detects the state of the output part of the power conversion unit and generates a feedback signal to be fed back to the power conversion unit. The driving part drives a switching element of the switching circuit.
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