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公开(公告)号：US20190207527A1
公开(公告)日：2019-07-04
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：US20240332979A1
公开(公告)日：2024-10-03
申请号：US18742605
申请日：2024-06-13
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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公开(公告)号：US20200052601A1
公开(公告)日：2020-02-13
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：US20240322698A1
公开(公告)日：2024-09-26
申请号：US18429123
申请日：2024-01-31
Inventor： Fumito KUSAMA
CPC classification number: H02M3/33573 , B60L50/60 , H02M1/0022 , H02M1/088 , H02M3/01 , H02M3/33592 , B60L2210/10
Abstract: A power conversion device according to the present disclosure is applied with a DC input voltage and outputs a DC output voltage to a load. The power conversion device includes first to fourth switch elements, a resonance circuit including an inductor and a capacitor, a transformer in which the inductor, the capacitor, and a primary-side coil are connected in series, a rectifier circuit, a smoothing circuit, and a controller. The controller controls an operation frequency, simultaneously switches the first and fourth switch elements in a first mode, and switches the fourth switch element with a phase of the fourth switch element delayed by a predetermined first phase with respect to the first switch element in a second mode. The controller switches the first and second modes according to at least one of the output voltage, an output current, a dead time current, the input voltage, and a circuit temperature.
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公开(公告)号：US20220200480A1
公开(公告)日：2022-06-23
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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Patent Agency Ranking
公开(公告)号：US20200220450A1
公开(公告)日：2020-07-09
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：US20200044573A1
公开(公告)日：2020-02-06
申请号：US16341387
申请日：2017-10-12
Inventor： Fumito KUSAMA , Makoto OZONE , Takaaki NORISADA , Yutaka KAMON
Abstract: The control unit controls the converter unit not to cause transfer of power between the transformer circuit unit and the converter unit in the first time period including the reversal time period in which a reversal of polarity of the voltage across the primary winding occurs. The control unit controls the converter unit to cause transfer of power in the first direction from the transformer circuit unit to the converter unit or the second direction opposite to the first direction in the second time period different from the first time period.
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公开(公告)号：US20220181985A1
公开(公告)日：2022-06-09
申请号：US17440685
申请日：2020-03-05
Inventor： Kenichi ASANUMA , Fumito KUSAMA
Abstract: A power conversion system configured to determine whether or not an abnormality is present in a power conversion circuit, and diagnosis method and program for the power conversion circuit are provided. A power conversion system includes a power conversion circuit, a snubber circuit, and a diagnosis unit. The power conversion circuit includes a transformer and a switching element configured to be electrically connected to the transformer, and the power conversion circuit is configured to convert electric power. The snubber circuit is electrically connected to the transformer and is configured to extract electrical energy from the power conversion circuit. The diagnosis unit is configured to make diagnosis for the power conversion circuit in accordance with at least one of a voltage at a terminal of the transformer, a voltage generated at the snubber circuit, or a current generated at the snubber circuit.
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公开(公告)号：US20220173652A1
公开(公告)日：2022-06-02
申请号：US17440702
申请日：2020-03-05
Inventor： Fumito KUSAMA , Takaaki NORISADA
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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公开(公告)号：US20200169177A1
公开(公告)日：2020-05-28
申请号：US16608132
申请日：2018-04-18
Inventor： Fumito KUSAMA , Takaaki NORISADA , Yutaka KAMON
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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