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公开(公告)号：US20230327546A1
公开(公告)日：2023-10-12
申请号：US18335058
申请日：2023-06-14
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Tatsuya HOSOTANI , Hiroyuki TAKATSUJI , Yuki ISHIKURA
CPC classification number: H02M1/44 , H02M3/156 , H02M3/33571
Abstract: A switching power supply device includes power supply input lines, DC output lines, a DC-DC converter circuit, and a noise reduction circuit. The noise reduction circuit includes a first half-bridge capacitor circuit that is connected between the power supply input lines, a second half-bridge capacitor circuit that is connected between the DC output lines, a first common mode choke coil, and an electrical path. The electrical path electrically connects a midpoint of the first half-bridge capacitor circuit to a midpoint of the second half-bridge capacitor circuit.
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公开(公告)号：US20210242768A1
公开(公告)日：2021-08-05
申请号：US17233680
申请日：2021-04-19
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Yuki ISHIKURA
IPC: H02M1/08 , H02M3/158 , H02M7/483 , H02M1/00 , H03K17/687
Abstract: A three-level converter includes a switch circuit including first to fourth switch groups with n switches. A boot diode connected to a drive circuit to drive a switch on a lowest voltage side of a second switch group includes a cathode to which an anode of another boot diode of the second switch group is connected. A boot diode connected to a drive circuit to drive a switch element on a lowest voltage side of a third switch group includes a cathode to which an anode of another boot diode of the third switch group is connected. A boot diode connected to a drive circuit to drive a switch on a lowest voltage side of a fourth switch group includes a cathode to which an anode of another boot diode of the fourth switch group is connected.
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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：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：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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Patent Agency Ranking
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：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：US20240136925A1
公开(公告)日：2024-04-25
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：US20230402922A1
公开(公告)日：2023-12-14
申请号：US18134599
申请日：2023-04-14
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Yuki ISHIKURA
Abstract: In a power converter, a first current loop includes a first snubber capacitor, a first high-side switch, and a first low-side switch, and a second current loop includes a second snubber capacitor, a second high-side switch, and a second low-side switch. In a plan view in a direction perpendicular or substantially perpendicular to a substrate, third low-potential wiring defining a portion of the second power line is located between the first current loop and the second current loop. A direction of current flowing through the first current loop is opposite to a direction of current flowing through the second current loop.
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公开(公告)号：US20230327539A1
公开(公告)日：2023-10-12
申请号：US18335075
申请日：2023-06-14
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Yuki ISHIKURA , Hiroyuki TAKATSUJI , Tatsuya HOSOTANI
Abstract: A switching power supply device includes an inverter circuit and a noise reduction circuit. The noise reduction circuit includes a first half-bridge capacitor circuit coupled to the DC input line, a second half-bridge capacitor circuit coupled to the AC output line, a first common-mode choke coil coupled between the first half-bridge capacitor circuit and the second half-bridge capacitor circuit, and an electrical path that electrically couples a middle point of the first half-bridge capacitor circuit with a middle point of the second half-bridge capacitor circuit.
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