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公开(公告)号：US12040618B2
公开(公告)日：2024-07-16
申请号：US17440598
申请日：2020-03-05
Inventor： Takaaki Norisada , Fumito Kusama
Abstract: A power conversion system according to the present disclosure includes a first circuit, a second circuit, and a third circuit. The first circuit has a first external terminal thereof electrically connected to either an AC power supply or an AC load. In the power conversion system, a first internal terminal, a second internal terminal, and a third internal terminal are electrically connected to the same connection unit. The second circuit controls a current or power being input to, or output from, the second circuit itself such that the current or the power is synchronized with power ripples caused by the AC power supply or the AC load. Either the AC power supply or the AC load is electrically connected to the first circuit.
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2.发明授权公开(公告)号：US09866129B2
公开(公告)日：2018-01-09
申请号：US15458129
申请日：2017-03-14
Inventor： Takaaki Norisada , Fumito Kusama , Go Yamada , Keiji Akamatsu
CPC classification number: H02M3/33546 , H02M1/08 , H02M7/4807 , H02M2001/0048 , Y02B70/1491
Abstract: A power converter includes first to fourth terminals, a transformer including primary and secondary windings, an inverter connected between the first and second terminals and the primary winding, a converter connected between fifth and sixth terminals, and a controller. The converter includes first to eighth switch circuits each including a diode and a switch connected in parallel. When a voltage between the fifth and sixth terminals has first polarity, the controller controls the first switch circuit to be in on-state during a first on-period and controls the fifth switch circuit to be in on-state during a second on-period completely including the first on-period. When the voltage between the fifth and sixth terminals has second polarity, the controller controls the second switch circuit to be in on-state during a third on-period and controls the sixth switch circuit to be in on-state during a fourth on-period completely including the third on-period.
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公开(公告)号：US09450517B2
公开(公告)日：2016-09-20
申请号：US14530733
申请日：2014-11-01
Inventor： Fumito Kusama , Hajime Hida , Shun Kazama , Kenji Hanamura
IPC: G05F1/00 , H03K17/56 , H02M7/537 , H02M3/158 , H03K17/0412
CPC classification number: H02M7/537 , H02M3/158 , H03K17/04123 , H03K2217/0036 , H03K2217/009
Abstract: A driving apparatus of the present disclosure includes a coil including a second terminal connected to a control terminal of a switching element, a charging switch connected between a first potential line and a first terminal of the coil, a clamp switch connected between the first potential line and the control terminal of the switching element, a charging diode connected between a second potential line and the first terminal of the coil, and a control circuit that outputs a charging control signal for turning on the charging switch and for turning off the charging switch before a potential of the control terminal of the switching element reaches the first potential and a clamp control signal for turning on the clamp switch after the charging switch is turned on.
Abstract translation: 本公开的驱动装置包括线圈，其包括连接到开关元件的控制端子的第二端子，连接在第一电位线和线圈的第一端子之间的充电开关，连接在第一电位线 以及开关元件的控制端子，连接在第二电位线和线圈的第一端子之间的充电二极管，以及控制电路，其输出用于接通充电开关的充电控制信号，并且在充电开关之前关闭充电开关 开关元件的控制端子的电位达到第一电位，并且在充电开关接通之后用于接通钳位开关的钳位控制信号。
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公开(公告)号：US11165359B2
公开(公告)日：2021-11-02
申请号：US16608132
申请日：2018-04-18
Inventor： Fumito Kusama , Takaaki Norisada , Yutaka Kamon
IPC: H02M7/5387 , H02M1/12 , H02M3/335 , H02M5/458 , H02M1/00
Abstract: A power conversion system includes a converter circuit and a control circuit. The control circuit controls, through use of PWM signals, high potential-side switches for a U-phase circuit, a V-phase circuit, and a W-phase circuit, respectively. The control circuit alternately switches between a first modulation method and a second modulation method at each half carrier period of each of the PWM signals. In the first modulation method, the control circuit determines, as a first value, a duty ratio of the PWM signal for one of a U phase, a V phase, and a W phase that has a maximum phase voltage. In the second modulation method, the control circuit determines, as a second value, the duty ratio of the PWM signal for one of the U phase, the V phase, and the W phase that has a minimum phase voltage.
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公开(公告)号：US11990830B2
公开(公告)日：2024-05-21
申请号：US17440702
申请日：2020-03-05
Inventor： Fumito Kusama , Takaaki Norisada
CPC classification number: H02M1/007 , H02M1/344 , H02M3/158 , H02M3/33576 , H02M7/53871 , H02M1/08
Abstract: A power conversion system according to the present disclosure includes a first circuit, a second circuit, and a third circuit. A first internal terminal, a second internal terminal, and a third internal terminal are electrically connected to the same connection unit. The third circuit provides an output voltage across a secondary winding of a transformer via a switching element and the transformer. The secondary winding is electrically connected to the third internal terminal. The output voltage has a waveform including a rising range in which the output voltage changes from a first potential to a second potential, a falling range in which the output voltage changes from the second potential to the first potential, and a flat range in which the output voltage is maintained at either the first potential or the second potential.
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Patent Agency Ranking
公开(公告)号：US10924024B2
公开(公告)日：2021-02-16
申请号：US16329554
申请日：2017-08-28
Inventor： Takaaki Norisada , Keiji Akamatsu , Fumito Kusama , Go Yamada , Yutaka Kamon , Makoto Ozone
Abstract: A control unit controls an inverter circuit such that a positive voltage and a negative voltage are alternately applied to a primary winding. The control unit controls a cycloconverter so as to allow no power to be transmitted between the cycloconverter and the inverter circuit in a first period including an inversion period during which a voltage of the primary winding has its polarity inverted. The control unit also controls the cycloconverter so as to allow power to be transmitted either in a first direction from the cycloconverter toward the inverter circuit, or in a second direction opposite from the first direction, in a second period different from the first period.
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公开(公告)号：US10673320B2
公开(公告)日：2020-06-02
申请号：US16468220
申请日：2017-12-08
Inventor： Koji Higashiyama , Fumito Kusama
IPC: H02M1/34 , H02M3/335 , H02M7/5387
Abstract: When a magnitude of a voltage between a pair of first voltage points in a main circuit exceeds a first clamp value, a first clamp circuit absorbs electrical energy of the main circuit from the pair of first voltage points to clamp the voltage to the first clamp value. When a magnitude of a voltage between a pair of second voltage points in the main circuit falls below a second clamp value, a second clamp circuit injects electrical energy to the main circuit from the pair of second voltage points to clamp the voltage to the second clamp value. A voltage conversion circuit performs voltage conversion between a first clamp voltage defining a first clamp value and a second clamp voltage defining a second clamp value.
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公开(公告)号：US10917004B2
公开(公告)日：2021-02-09
申请号：US16471325
申请日：2017-12-12
Inventor： Koji Higashiyama , Fumito Kusama
Abstract: A snubber circuit includes a clamp circuit and a voltage conversion circuit. The clamp circuit is configured to absorb electrical energy of a main circuit from a pair of secondary-side voltage points on a secondary side of the main circuit to clamp a secondary-side voltage. The main circuit is of insulating type and is configured to perform electric power conversion. The voltage conversion circuit which is of insulating type is electrically connected to a pair of primary-side voltage points on a primary side of the main circuit and is configured to subject, to direct-current conversion, the direct-current voltage generated by the clamp circuit and output the direct-current voltage to the pair of primary-side voltage points. The voltage conversion circuit includes a transformer, a first capacitance component electrically connected to a primary winding wire of the transformer, and a second capacitance component electrically connected to a secondary winding wire of the transformer.
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公开(公告)号：US10778106B2
公开(公告)日：2020-09-15
申请号：US16607691
申请日：2018-04-23
Inventor： Yutaka Kamon , Fumito Kusama , Takaaki Norisada , Makoto Ozone
Abstract: A power conversion system includes a first capacitor, an isolated type converter circuit, and a control circuit. The first capacitor is connected to the direct-current power supply via an inrush current prevention circuit. The inrush current prevention circuit is switchable at least between a high-impedance state and a low-impedance state. The converter circuit includes a transformer, and the first capacitor is connected to a primary winding wire of the transformer. The control circuit controls the inrush current prevention circuit and the converter circuit to cause the converter circuit to start operating, and then, the control circuit switches the inrush current prevention circuit from the high-impedance state to the low-impedance state.
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公开(公告)号：US09866135B2
公开(公告)日：2018-01-09
申请号：US15465033
申请日：2017-03-21
Inventor： Fumito Kusama , Takaaki Norisada , Go Yamada , Keiji Akamatsu
CPC classification number: H02M3/33592 , H02M1/08 , H02M7/4807 , H02M7/797 , H02M2001/0009 , H02M2001/0048 , H02M2001/0054 , H02M2001/346 , H02M2001/348 , H02M2007/4815 , Y02B70/1441 , Y02B70/1491
Abstract: A power conversion device includes first and second terminals connected to a DC power source, third and fourth terminals connected to a commercial power system or a load, a transformer including a primary winding having seventh and eighth terminals and a secondary winding having fifth and sixth terminals, an inverter circuit connected between the first and second terminals and the seventh and eighth terminals, a converter circuit connected between the fifth and sixth terminals and the third and fourth terminals, a diode bridge including first and second AC input terminals connected to the fifth and sixth terminals, respectively, and first and second DC output terminals, a first capacitor connected between the first and second DC output terminals, and a first resistor connected in parallel with the first capacitor between the first and second DC output terminals.
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