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公开(公告)号：US20240423473A1
公开(公告)日：2024-12-26
申请号：US18824386
申请日：2024-09-04
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Norikazu SAKAMOTO , Tatsuya HOSOTANI
Abstract: A housing of an in-vivo implantable medical device includes a window including a nonmetallic biocompatible material that enables formation of an electromagnetic resonance field and radio communication. In plan view of the housing, an outer shape of the window is larger than an outer shape of a power receiving coil. An outer shape of a magnetic sheet is larger than the outer shape of the power receiving coil to form a magnetic circuit that serves as a main magnetic flux that forms an electromagnetic resonance field to obtain power for the power receiving coil. A radio communication antenna is at a position where the main magnetic flux does not intersect. An outer shape of the radio communication antenna has an area of 1/100 or less of the outer shape of the power receiving coil.
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公开(公告)号：US20240413755A1
公开(公告)日：2024-12-12
申请号：US18813423
申请日：2024-08-23
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Yoshihiro FUJIWARA , Tatsuya HOSOTANI
Abstract: A signal extension circuit is electrically connected between an MPU and a drive circuit and outputs a second drive signal generated by adjusting a phase of a first drive signal. A low-voltage malfunction prevention circuit is connected between the input end of the drive circuit and the output ends of the MPU and the signal extension circuit. The first drive signal is a three-state signal having one of first, second and third voltages in ascending order. The low-voltage malfunction prevention circuit includes a detection comparison circuit that detects an output voltage and determines whether the output voltage is less than or equal to a threshold value representing a voltage value that is less than a predetermined output voltage. When the output voltage is less than the threshold value, the low-voltage malfunction prevention circuit outputs the first drive signal as the second drive signal to the drive circuit.
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公开(公告)号：US20240235395A9
公开(公告)日：2024-07-11
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：US20240235394A9
公开(公告)日：2024-07-11
申请号：US18399221
申请日：2023-12-28
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Yuki ISHIKURA , Tatsuya HOSOTANI , Hiroyuki TAKATSUJI
Abstract: A circuit board of a switching power supply device includes a positive terminal circuit pattern and a negative terminal circuit pattern that are provided on a component mount surface and respectively supply currents from input parts to two input terminals of a common mode choke coil. The positive terminal circuit pattern and the negative terminal circuit pattern are positioned in parallel and close to each other. The component mount surface of the circuit board includes a component mount surface side ground pattern arranged below the common mode choke coil. A heat dissipation ground surface of the circuit board includes a ground pattern and a plurality of heat dissipation conductor patterns. Input terminals and output terminals of the common mode choke coil are respectively electrically and thermally connected to the heat dissipation conductor patterns via through-hole conductors provided between the component mount surface and the heat dissipation ground surface.
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公开(公告)号：US20240206071A1
公开(公告)日：2024-06-20
申请号：US18587254
申请日：2024-02-26
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Tatsuya HOSOTANI , Osamu MIKI
Abstract: A switching power supply device includes a circuit board on which plural inductor windings are formed, and a common magnetic body incorporated into the circuit board from both sides. The circuit board has a common wiring line electrically connected to one end of each of the plural inductor windings in common. The common magnetic body has inner legs inserted through inside the plural inductor windings and an outer leg inserted through outside the plural inductor windings. A smoothing capacitor connected between a common wiring line and ground wiring is mounted on the circuit board to constitute a smoothing filter with the inductance of the common wiring line and the smoothing capacitor. The plural inductor windings are magnetically coupled to each other, and the common wiring line and the plural inductor windings are substantially not magnetically coupled.
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Patent Agency Ranking
公开(公告)号：US20240154463A1
公开(公告)日：2024-05-09
申请号：US18415482
申请日：2024-01-17
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Tatsuya HOSOTANI , Takahiro NAGAI , Hiromitsu ITO
Abstract: A short-range wireless communication device includes a coil, a capacitor, a short-range wireless communication IC, and a rectifier circuit. The short-range wireless communication IC and the rectifier circuit are connected to the coil via a node. The capacitor is connected between the node and the rectifier circuit. A receiving circuit is composed of the coil and a power-receiving circuit is composed of the coil and the capacitor. An output impedance of the receiving circuit is set larger than an output impedance of the power-receiving circuit at a communication frequency, and the output impedance of the power-receiving circuit is set smaller than the output impedance of the receiving circuit at a power-receiving frequency, by appropriately setting capacitance of the capacitor.
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公开(公告)号：US20240154307A1
公开(公告)日：2024-05-09
申请号：US18415509
申请日：2024-01-17
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Tatsuya HOSOTANI , Takahiro NAGAI
Abstract: A short-range wireless communication device includes a receiving circuit, a power-receiving circuit, a short-range wireless communication IC, a rectifier circuit, and a load circuit. The receiving circuit and the power-receiving circuit have a common circuit portion composed of a coil, a capacitor, and a capacitor. The coil and the capacitor constitute a first parallel resonance circuit, and the coil, the capacitor, and the capacitor constitute a second parallel series resonance circuit. The first parallel resonance circuit and the second parallel series resonance circuit function as impedance adjusting circuits, an output impedance of the receiving circuit is adjusted to be higher than or equal to a first predetermined value for realizing load modulation and an output impedance of the power-receiving circuit is adjusted to be lower than or equal to a second predetermined value for realizing power supply, and operations of the receiving circuit and the power-receiving circuit are realized.
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公开(公告)号：US20230327545A1
公开(公告)日：2023-10-12
申请号：US18334154
申请日：2023-06-13
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Hiroyuki TAKATSUJI , Tatsuya HOSOTANI , Yuki ISHIKURA
CPC classification number: H02M1/4225 , H02M7/12 , H02M1/123
Abstract: A power factor correction switching power supply device includes a power factor correction circuit connected to an alternating-current input line, a first half-bridge capacitor circuit connected between lines of the AC input line, a second half-bridge capacitor circuit connected between lines of a direct-current output line that is closer to a load than a first output capacitor, a common mode choke coil disposed between the first output capacitor and the second half-bridge capacitor circuit, and an electric path configured to electrically connect a midpoint of the first half-bridge capacitor circuit and a midpoint of the second half-bridge capacitor circuit to form a noise balancing circuit. The noise balancing circuit has a potential different from a potential of a ground and is configured to balance common mode noise.
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公开(公告)号：US20230268776A1
公开(公告)日：2023-08-24
申请号：US18311193
申请日：2023-05-02
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Takahiro NAGAI , Tatsuya HOSOTANI
CPC classification number: H02J50/12 , H02J50/80 , H04B5/0037
Abstract: An electronic card of a wireless communication charging circuit system includes a power reception coil, a power reception circuit, a power storage device, a charging circuit, a voltage conversion circuit that is connected to the power storage device and generates a prescribed power supply voltage, a communication antenna , a communication circuit that performs communication using output power of the voltage conversion circuit, and a control circuit that controls the voltage conversion circuit and the charging circuit. The control circuit sets a power path in a communication period so that the communication circuit performs communication and power used by a microcontroller is supplied from the power storage device, and sets a power path in a charging period so that a reader-writer device, which was made to recognize the communication circuit, generates a magnetic field and power used by the microcontroller is supplied from the power reception circuit.
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公开(公告)号：US20230124799A1
公开(公告)日：2023-04-20
申请号：US18068459
申请日：2022-12-19
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Osamu MIKI , Tatsuya HOSOTANI
Abstract: A wireless power transfer system includes a power transmission circuit that includes power transmission resonance mechanisms including power transmission coils and power transmission resonant capacitors, and a power reception circuit that includes a power reception resonance mechanism including a power reception coil that magnetically couples to the power transmission coils and a power reception resonant capacitor. The power transmission circuit includes a square wave power supply circuit including a direct-current power supply and a switching circuit, the power transmission resonance mechanisms and the power reception resonance mechanism form electromagnetic resonance coupling, and the power reception resonance mechanism acquires reception power by superposing resonance currents induced by the electromagnetic resonance coupling.
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