Murata Manufacturing Co., Ltd.

Murata Manufacturingco., Ltd.

Tatsuya Hosotani

Hiroshi Takemura

Takahiro Nagai

Osamu Miki

Kiyokazu Yamada

Norikazu Sakamoto

Hiroyuki Takatsuji

Naoki Yamaguchi

Koyo Kaiwa

Yoshiyuki Uno

Yuki Ishikura

Takanori Koyama

Satoshi Yamaguchi

Yasuji Okamoto

Takahiro Minagawa

Tomokuni Tokugawa

Keiichi Ichikawa

Mitsuyoshi Nishide

Tadahiko Matsumoto

Katsumi Taniguchi

Makoto Takeoka

Takafumi Nasu

Takashi Hara

Tomohiro Kato

Tomohiro Yamada

Masaaki Kanao

Kentaro Takahashi

Takuji Yokawa

Tatsuya Doi

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.

Circuit board module

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.

Wireless power transfer system

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.

Power factor correction switching power supply device

Converter units of a power supply system apparatus each perform feedback control using an individual voltage feedback loop. Master-slave control for synchronizing oscillation control signals is performed in such a manner that master control of the converter unit and slave control of the converter unit are performed. The oscillation control signals are set in such a manner that a phase difference occurs between a plurality of power conversion circuits in association with the number of power conversion circuits that are operate. The power supply system apparatus supplies power to a load, while causing the converter units to be synchronized with each other and performing a voltage conversion operation for converting the voltage of an input power supply using a plurality of power conversion circuits in the converter units.

Power supply system apparatus

A switching power-supply unit includes a power conversion circuit, a control circuit, a class-Y capacitor, and a common-mode choke coil. The control circuit has a direct electrical connection to the power conversion circuit. The class-Y capacitor is connected to the power conversion circuit on its side of a direct-current power supply, and is connected to the ground potential. The common-mode choke coil is connected to the control circuit on its side of a direct-current power supply. A noise balancing circuit is formed of a closed circuit including the power conversion circuit, the control circuit, the class-Y capacitor, and the common-mode choke coil. The noise balancing circuit causes common-mode currents to be confined and canceled out each other. The common-mode currents serve as switching noise generated in multiple parts of the closed circuit due to a switching operation of power-conversion switching devices.

Switching power-supply unit

A wireless rechargeable solid-state battery module includes a solid-state battery; an internal structure including an internal circuit electrically connected with the battery; positive and negative electrode terminals, each of which is electrically connected with the solid-state battery, is exposed on an outer surface, and is where the positive or negative electrode terminal can be mounted on an electronic circuit board; barrier layers that entirely or partially contain a conductor and isolate the battery and the internal structure from an outside air environment; and a power receiving terminal electrically connected with an external circuit, which includes a power receiving coil coupled with an external electromagnetic or magnetic field, is electrically connected with the internal circuit, and is in an outside of the barrier layers. The power receiving coil converts the external electromagnetic or magnetic field into electrical energy and supplies current to the internal circuit via the power receiving terminal.

Wireless rechargeable solid-state battery module and wireless power supply module

A circuit module includes a circuit module substrate having an area smaller than a large-scale circuit board, an electronic circuit component mounted on the circuit module substrate, a connection pin provided to the circuit module substrate, and a circuit-module-substrate-side fitting structure part provided to the circuit module substrate. A pin receptacle and the connection pin are electrically connected to each other. A non-conductive thermal adhesive layer is formed between a surface of the circuit module substrate and a surface of a base material of the large-scale circuit board facing to each other, the non-conductive thermal adhesive layer electrically insulating and thermally joining the surfaces by a non-conductive thermally conductive material.

Circuit module and large-scale circuit system

A power supply system apparatus includes a plurality of power conversion circuits and an MPU. The MPU outputs oscillation control signals to the plurality of power conversion circuits. Each of the plurality of power conversion circuits includes a pulse width modulation control circuit formed of an analog electronic circuit. For example, the power conversion circuit drives switching elements on the basis of a feedback signal obtained by detecting an output voltage of a common output terminal. An integrated system controller including the MPU and the plurality of power conversion circuits includes a plurality of individual voltage feedback control loops for individually controlling the plurality of power conversion circuits on the basis of feedback signals and supplies power to a load, while the plurality of power conversion circuits performing driving control using the individual voltage feedback control loops at the same time.

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.

Switching power supply device

An in vivo-implantable medical device includes a housing that includes a body part and a protruding part, and that forms a sealed inner space; a power-receiving coil in a part of the inner space and that receives power by interlinking with external magnetic flux generated by an AC current flowing in an externally located power-transmitting coil; and a circuit substrate including a power reception circuit electrically connected to the power-receiving coil. The body part includes a metallic biocompatible material and the protruding part includes a non-metallic biocompatible material. The protruding part is structured so that, for a magnetic path along which the external magnetic flux passes, a magnetic path in which the magnetic flux interlinks with the power-receiving coil while avoiding the body part is formed, and the protruding part reduces eddy current loss caused by eddy currents generated by the external magnetic flux interlinking with the body part.

Vivo-implantable medical device

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.

Wirelessly chargeable battery

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.

Electronic card

An in-vivo implantable electronic device includes a housing, a power reception coil, and an electronic circuit. The housing is formed of a biocompatible material and forms an internal space sealed. The power reception coil is disposed in the internal space of the housing and receives power by interacting with an electromagnetic field formed by an external electric field or magnetic field, or transmits an electromagnetic wave to the outside. The electronic circuit is disposed in the internal space, is connected to the power reception coil, and performs at least processing of an electric signal. The housing includes a first member in a box shape formed of a biocompatible metal material and having an opening, a second member formed of a biocompatible nonmetal material and having a shape that closes the opening, a packing in an annular shape disposed between the first member and the second member.

In-vivo implantable electronic device

An in-vivo implantable medical device includes a housing, an electronic circuit component, a power reception coil, and a magnetic material. The housing is formed of a biocompatible material and forms an internal space. The electronic circuit component is disposed in the internal space. The power reception coil is disposed in the internal space, interacts with an external electromagnetic field to form an electromagnetic resonance field to receive power. At least part of a region of the housing in which the electromagnetic resonance field is formed is formed of a biocompatible nonmetal material.

In-vivo implantable medical device

A first circuit board includes a positive output pin and a negative output pin of a power conversion circuit, each of which has a shape projecting from a second main surface. A second circuit board has a positive through via and a negative through via, each of which has a shape extending between a third main surface and a fourth main surface. The second main surface of the first circuit board and the third main surface of the second circuit board are physically in close contact with each other. The positive output pin is inserted through the positive through via to reach the fourth main surface. The negative output pin is inserted through the negative through via in such a manner as to reach the fourth main surface. The load receives a current supplied from the power conversion circuit through the positive output pin and the negative output pin.

Growing community of inventors

Nagaokakyo, Japan

Tatsuya Hosotani