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公开(公告)号：US10033275B2
公开(公告)日：2018-07-24
申请号：US15013426
申请日：2016-02-02
Inventor： Takuya Ishii , Atsushi Kitagawa , Tadata Hatanaka
Abstract: A DC-DC converter module includes a module substrate on which switching transistors and a controller IC chip are mounted, stud terminals mounted on a surface of the module substrate, and an inductor attached to the stud terminals such that the inductor faces the module substrate. In a plan view, the switching transistors are arranged within an area where the inductor overlaps the module substrate, whereas at least a portion of the controller IC chip is arranged outside the area.
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公开(公告)号：US11252813B2
公开(公告)日：2022-02-15
申请号：US16533643
申请日：2019-08-06
Inventor： Yoshihisa Minami , Takuya Ishii
Abstract: An advantageous effect of a low-pass filter that reduces high-frequency noise can be obtained by including an input terminal that extends from a front surface to a rear surface of a multilayer circuit board including a double-sided circuit board; a first wiring conductor having an end connected to the input terminal on the rear surface of the multilayer circuit board; a first via that extends from an other end of the first wiring conductor to the front surface of the multilayer circuit board; a second wiring conductor having an end connected to the first via on the front surface of the multilayer circuit board; and a first input capacitor disposed on the second wiring conductor; by being conductive due to the input terminal and the first via being configured in series; and including the first input capacitor.
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Patent Agency Ranking
公开(公告)号：US10530269B2
公开(公告)日：2020-01-07
申请号：US16455623
申请日：2019-06-27
Inventor： Takao Hashimoto , Takuya Ishii
Abstract: An alternating current-direct current (AC-DC) converter includes: an input AC power supply that outputs an input AC voltage; a step-up converter that converts the input AC voltage into an output DC voltage to be outputted from an output capacitor; and an inrush current suppressing circuit. The inrush current suppressing circuit includes: an inrush current suppressing resistor provided on a path through which a current from the input AC power supply flows to charge the output capacitor and returns to the input AC power supply; a resistance short-circuiting switch that short-circuits the inrush current suppressing resistor; and a control circuit that generates a signal for turning off the resistance short-circuiting switch when an absolute value of the input AC voltage is higher than the output DC voltage.
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公开(公告)号：US10483966B2
公开(公告)日：2019-11-19
申请号：US16226081
申请日：2018-12-19
Inventor： Takahiro Uehara , Takuya Ishii , Hiroyuki Handa , Atsushi Kitagawa , Takeshi Tanaka
Abstract: A switching circuit includes: a drive power supply; a first transistor and a second transistor; a drive signal source; and a drive circuit. Each of the first transistor and the second transistor includes: a drain electrode and a source electrode in which a main current flows when a corresponding one of the first transistor and the second transistor is ON; a first source terminal for passing the main current; and a second source terminal. Here, the first source terminal is connected to the source electrode at an impedance lower than an impedance of the second source terminal.
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公开(公告)号：US10205449B2
公开(公告)日：2019-02-12
申请号：US15925104
申请日：2018-03-19
Inventor： Takahiro Uehara , Takuya Ishii , Hiroyuki Handa , Atsushi Kitagawa , Takeshi Tanaka
Abstract: A switching circuit includes: a drive power supply; a first transistor and a second transistor; a drive signal source; and a drive circuit. Each of the first transistor and the second transistor includes: a drain electrode and a source electrode in which a main current flows when a corresponding one of the first transistor and the second transistor is ON; a first source terminal for passing the main current; and a second source terminal. Here, the first source terminal is connected to the source electrode at an impedance lower than an impedance of the second source terminal.
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公开(公告)号：US12074516B2
公开(公告)日：2024-08-27
申请号：US17758404
申请日：2020-12-17
Inventor： Hiroki Akashi , Takuya Ishii , Yoshihito Kawakami , Kazuhiro Yahata , Takeshi Azuma , Yoshihisa Minami
Abstract: A switch circuit is configured of a first semiconductor element and a second semiconductor element connected in series, and receives a DC voltage of 100 V or more. The drive circuit causes the first semiconductor element or the second semiconductor element to perform a switching operation. The isolated power supply circuit converts a predetermined power supply voltage into an isolated first power supply voltage, and outputs the first power supply voltage to the drive circuit. The isolation signal converter converts a first signal of 6 MHz or more into an isolated first drive signal, and outputs the first drive signal to the drive circuit. The single substrate mounts the isolated power supply circuit and the isolation signal converter. Both the first semiconductor element and the second semiconductor element are wide bandgap semiconductor elements.
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公开(公告)号：US10536074B2
公开(公告)日：2020-01-14
申请号：US16455615
申请日：2019-06-27
Inventor： Takao Hashimoto , Takuya Ishii
Abstract: A power-factor correcting converter includes: a series circuit including a first higher-potential switch and a first lower-potential switch connected in series to each other; and another series circuit including a second higher-potential switch and a second lower-potential switch connected in series to each other. In a positive phase period of the input AC voltage, a control circuit turns off the second higher-potential switch, turns on the second lower-potential switch, and alternately turns on and off the first lower-potential switch as a master switch and the first higher-potential switch as a slave switch. In a negative phase period of the input AC voltage, the control circuit reverses the on/off operation and the master/slave relationship, and turns on and off only the master switch and turns off the slave switch when the absolute value of the input AC voltage is smaller than or equal to a predetermined value.
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