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公开(公告)号：US20220360182A1
公开(公告)日：2022-11-10
申请号：US17636184
申请日：2020-06-22
Inventor： Shogo HIROTA , Kenji HANAMURA , Takashi SHIRAKAWA
Abstract: For power transfer from a first DC part to a second DC part in a dual active bridge (DAB) converter by stepping up a voltage, the second bridge circuit 12 includes a period in which a secondary winding n2 of an insulated transformer TR1 and the second DC part conduct and a period in which ends of the secondary winding n2 of the insulated transformer TR1 are short-circuited in the second bridge circuit 12. A control circuit 13 fixes a phase difference between a first leg a the second leg, variably controls a simultaneous off period of a fifth switching element S5 and a sixth switching element S6, and variably controls a simultaneous off period of a seventh switching element S7 and an eighth switching element S8.
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公开(公告)号：US20220193867A1
公开(公告)日：2022-06-23
申请号：US17604894
申请日：2020-01-30
Inventor： Kenji HANAMURA , Masayuki NAKAHARA , Fumiiki YONEDA
IPC: B25B21/02 , B25B23/147
Abstract: An electric power tool includes an electric motor (AC motor), an impact mechanism, an impact detecting unit, and a measuring unit. The impact mechanism performs an impact operation that generates impacting force by receiving motive power from the electric motor. The impact detecting unit determines whether or not the impact operation is being performed. The measuring unit measures at least one of a d-axis current or a q-axis current, each of which is supplied to the electric motor. The impact detecting unit determines, based on at least one of a measured value (current measured value) of the d-axis current or a measured value (current measured value) of the q-axis current, whether or not the impact operation is being performed. The measured values (current measured values) of the d-axis current and the q-axis current have been obtained by the measuring unit.
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公开(公告)号：US20220321027A1
公开(公告)日：2022-10-06
申请号：US17613016
申请日：2020-02-21
Inventor： Kenji HANAMURA , Wataru HORIO , Hiroyuki FUJII , Shogo HIROTA
IPC: H02M7/483 , H02M1/00 , H02M1/32 , H02M7/5395
Abstract: An inverter circuit includes a plurality of flying capacitors and converts a DC voltage supplied from a DC power supply into an AC voltage. A filter circuit approximates a waveform of an output voltage of the inverter circuit to a sinusoidal wave. An excess current protection circuit supplies a block signal for turning off a plurality of switching elements to the driving circuit when an excess current is detected. When at least one of an abnormal voltage in any of the plurality of flying capacitors and an abrupt change in an output voltage of the power converter occurs, voltages other than a positive voltage of the DC power supply, a negative voltage of the DC power supply, and a zero voltage are restricted from being output from the inverter circuit.
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公开(公告)号：US20220278625A1
公开(公告)日：2022-09-01
申请号：US17636676
申请日：2020-06-22
Inventor： Shogo HIROTA , Kenji HANAMURA , Takashi SHIRAKAWA
Abstract: For power transfer from a first DC part to a second DC part in a dual active bridge (DAB) converter by stepping down a voltage, a first bridge circuit includes a period in which the first DC part and a primary winding of an insulated transformer conduct and a period in which ends of a primary winding of the insulated transformer are short-circuited in the first bridge circuit. A second bridge circuit includes a rectification period. A control circuit variably controls a phase difference between a first leg a the second leg, variably controls a simultaneous off period of a fifth switching element and a sixth switching element, and variably controls a simultaneous off period of a seventh switching element and an eighth switching element.
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公开(公告)号：US20220247338A1
公开(公告)日：2022-08-04
申请号：US17603748
申请日：2020-01-30
Inventor： Fumiiki YONEDA , Kenji HANAMURA , Masayuki NAKAHARA
IPC: H02P21/22
Abstract: An electric tool includes an electric motor (AC motor), an impact mechanism, and a control unit. The control unit includes an impact detecting unit. The control unit performs feedback control on an operation of the electric motor. In a following period after the impact detecting unit has detected that the impact mechanism has started an impact operation, the control unit changes target parameters in a preceding period before the impact detecting unit detects that the impact mechanism has started the impact operation into different target parameters. The target parameters include a control gain of the feedback control.
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Patent Agency Ranking
公开(公告)号：US20220216746A1
公开(公告)日：2022-07-07
申请号：US17604407
申请日：2020-01-30
Inventor： Fumiiki YONEDA , Kenji HANAMURA , Masayuki NAKAHARA
Abstract: An electric tool includes an AC motor (an electric motor) and a control unit. The AC motor includes a permanent magnet and a coil. The control unit is configured to perform control on operation of the AC motor. The control performed by the control unit includes field weakening control. In the field weakening control, the control unit causes a flux-weakening current to flow through the coil. The flux-weakening current is a current that generates, in the coil, a magnetic flux that weakens a magnetic flux of the permanent magnet.
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公开(公告)号：US20210367532A1
公开(公告)日：2021-11-25
申请号：US16753475
申请日：2018-09-13
Inventor： Kazunori KIDERA , Kenji HANAMURA
IPC: H02M7/537
Abstract: A power converter 10 includes: flying capacitor circuits 11 and 12 connected in series so as to be in parallel with a DC power supply; flying capacitor circuits 13 and 14 connected in series so as to be in parallel with the DC power supply; switching elements S1 and S2 connected in series between output terminals of the flying capacitor circuits 11 and 12; switching elements S3 and S4 connected in series between output terminals of the flying capacitor circuits 13 and 14; a first output end OUT1 provided at a midpoint between the switching elements S1 and S2; and a second output end OUT2 provided at a midpoint between the switching elements S3 and S4, wherein a node between the flying capacitor circuits 11 and 12 and a node between the flying capacitor circuits 13 and 14 are connected to a midpoint of a DC power supply voltage.
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公开(公告)号：US20200019199A1
公开(公告)日：2020-01-16
申请号：US16582156
申请日：2019-09-25
Inventor： Kota MAEBA , Akihiro KIKUCHI , Wataru HORIO , Hiroyuki FUJII , Kenji HANAMURA , Tomoki ITO
Abstract: In a power converter including: a first DC-DC converter, an inverter, and a control circuit, a second DC-DC converter that controls an input and an output of a power storage unit is connectable to a DC bus. The control circuit deactivates a reverse power flow suppression function for suppressing a reverse power flow from the inverter to a power system when the second DC-DC converter is not connected to the DC bus and activates the reverse power flow suppression function when the second DC-DC converter is connected to the DC bus.
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公开(公告)号：US20210288504A1
公开(公告)日：2021-09-16
申请号：US17258092
申请日：2019-06-19
Inventor： Wataru HORIO , Hiroyuki FUJII , Kenji HANAMURA , Kota MAEBA
Abstract: The converter circuit includes an inverter. The converter circuit receives DC power from a DC power supply (such as a solar cell or a storage battery unit), has the DC power converted into AC power by at least the inverter, and outputs the AC power to a load or a power grid. When acquiring information that two or more types of power curtailment causes have arisen, a control circuit makes the converter circuit limit power output to a maximum degree of power curtailment out of two or more degrees of power curtailment according to specifics of the two or more types of power curtailment causes.
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10.发明申请公开(公告)号：US20190326752A1
公开(公告)日：2019-10-24
申请号：US16475611
申请日：2018-01-22
Inventor： Akihiro KIKUCHI , Kenji HANAMURA , Tomoki ITO
Abstract: In a power converter, a DC bus is supplied with a DC power from a voltage conversion circuit for regulating a voltage of a power output from a DC power supply, a voltage of the DC power being regulated by the voltage conversion circuit. An inverter converts a DC power on the DC bus into an AC power and supplies the AC power as converted to a power system. A controller controls the inverter. When it is necessary to suppress an output, the controller suppresses the AC power supplied by the inverter to increase a voltage on the DC bus.
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