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公开(公告)号：US20240333132A1
公开(公告)日：2024-10-03
申请号：US18422853
申请日：2024-01-25
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Ryuji YAMADA
CPC classification number: H02M1/08 , H02M1/0032 , H02M7/21
Abstract: A switching control circuit including: a command value output circuit that respectively outputs a command value indicating a first time period, and command values indicating second and third time periods, in first and second load states; a first driver circuit that, in the first load state, turns on a first transistor after a first inductor current reaches a first value, and subsequently turns off the first transistor when the first time period has elapsed; and a second driver circuit that, in the second load state, turns on a second transistor when a second inductor current reaches a second value, and subsequently turns off the second transistor when the third time period has elapsed. The first driver circuit, in the second load state, turns on the first transistor when the first inductor current reaches the first value, and subsequently turns off the first transistor when the second time period has elapsed.
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公开(公告)号：US20240146184A1
公开(公告)日：2024-05-02
申请号：US18455339
申请日：2023-08-24
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Ryuji YAMADA
CPC classification number: H02M1/4208 , H02M1/0009 , H02M1/088 , H02M7/23
Abstract: A switching control circuit for a power supply circuit including first and second inductors, and first and second transistors controlling first and second inductor currents flowing through the first and second inductors, respectively. The switching control circuit includes: a detection circuit detecting a switching period of the first transistor and a time difference between first and second timings, at which the first and second inductor currents respectively reach first and second predetermined values; an error output circuit outputting an error between a predetermined ratio and a ratio of the time difference to the switching period; and a driving signal output circuit configured to output a driving signal to turn on the second transistor, after the second inductor current reaches the second predetermined value, and to turn off the second transistor, in response to a second time period according to the first time period and the error having elapsed.
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公开(公告)号：US20230072309A1
公开(公告)日：2023-03-09
申请号：US17877377
申请日：2022-07-29
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Ryuji YAMADA , Ryuunosuke ARAUMI
Abstract: A switching control circuit for a power supply circuit, including: a first command value output circuit outputting a first command value; a correction circuit correcting the first command value, to output a second command value; a first timer circuit measuring a first time period starting from a first timing at which a transistor of the power supply circuit is turned on; and a driving signal output circuit outputting a driving signal to turn on the transistor in response to an inductor current of the power supply circuit reaching a predetermined value and the first time period having elapsed since the first timing, and outputting the driving signal to turn off the transistor based on the second command value. The correction circuit causes an on time period of the transistor to increase, when the first time period has elapsed since the first timing, after the inductor current reaches the predetermined value.
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公开(公告)号：US20190097532A1
公开(公告)日：2019-03-28
申请号：US16056168
申请日：2018-08-06
Applicant: Fuji Electric Co., Ltd.
Inventor： Ryuji YAMADA
IPC: H02M3/156 , H02H7/125 , H02M1/42 , H03K17/082 , H02M7/25
CPC classification number: H02M3/156 , H02H7/125 , H02M1/4225 , H02M1/4233 , H02M1/4258 , H02M7/25 , H02M2001/0003 , H03K17/082
Abstract: An AC-DC converter that converts an AC power supply voltage to a DC output voltage of a prescribed magnitude with power factor regulation includes a voltage regulation unit; an instantaneous value command calculator; a current regulation unit; an output voltage command calculator; a drive signal generator that generates a drive signal for a semiconductor switching device from the output voltage command and a carrier signal, the driving signal being provided to the semiconductor switching device so as to switch the semiconductor switching device ON and OFF; and a rectified voltage estimation unit that that derives an estimated value of a rectified voltage obtained by rectifying the AC power supply voltage from the output voltage command without actually detecting a rectified voltage, for providing to the instantaneous value command calculator and the output voltage command calculator.
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公开(公告)号：US20180358807A1
公开(公告)日：2018-12-13
申请号：US15959308
申请日：2018-04-23
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Ryuji YAMADA
Abstract: A power supply system, including: a plurality of power supply apparatuses; and an acquisition unit to acquire a load parameter representing load state of the plurality of power supply apparatuses as a whole, wherein each power supply apparatus has a control unit to control, depending on the load parameter, output by said power supply apparatus according to a reference condition different from at least the other one of the plurality of power supply apparatuses, will be provided.
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Patent Agency Ranking
公开(公告)号：US20170214324A1
公开(公告)日：2017-07-27
申请号：US15366003
申请日：2016-12-01
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Satoru FUJITA , Ryuji YAMADA
CPC classification number: H02M3/33507 , H02M3/337 , H02M7/003 , H02M7/162 , H02M7/217 , H02M2001/007 , H02M2001/0074
Abstract: A direct current (DC) power supply, including a plurality of first printed circuit boards (PCBs) disposed on a primary side of the DC power supply, a plurality of alternating current (AC)/DC converter circuits having different potentials, each formed on a different one of the plurality of first PCBs, a second PCB disposed on a secondary side of the DC power supply, and a plurality of DC/DC converter circuits having an equal potential disposed on the second PCB. The AC/DC converter circuits are electrically connected in series and connected to an AC input of the DC power supply. The DC/DC converter circuits are electrically connected in parallel and connected to a DC output of the DC power supply.
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公开(公告)号：US20160301305A1
公开(公告)日：2016-10-13
申请号：US15187591
申请日：2016-06-20
Applicant: Fuji Electric Co., Ltd.
Inventor： Ryuji YAMADA
CPC classification number: H02M3/156 , H02M7/06 , H02M7/10 , H02M2001/007 , H02M2001/0074
Abstract: An AC to DC converter includes a plurality of rectifier circuits connected in series to an AC voltage source at an input side to collectively receive an output voltage of the AC voltage source; and a plurality of switching units respectively connected to the plurality of rectifier circuits, each of the switching units having a semiconductor switching device, a diode, and a capacitor, and performing ON/OFF switching of the semiconductor switching device provided therein to step up a voltage received from the corresponding rectifier circuit, each of the switching units supplying the stepped-up voltage to said capacitor through said diode so that a resulting DC across said capacitor can be provided, as a DC output voltage of the switching unit, to a respective load to be connected to terminals of said capacitor.
Abstract translation: AC-DC转换器包括在输入侧与AC电压源串联连接的多个整流电路，以共同接收AC电压源的输出电压; 以及分别连接到多个整流电路的多个开关单元，每个开关单元具有半导体开关器件，二极管和电容器，并且对其中提供的半导体开关器件进行ON / OFF切换以升高 从相应的整流电路接收的电压，每个开关单元通过所述二极管向所述电容器提供升压电压，使得可以将所述电容器两端的所得直流作为开关单元的直流输出电压提供给相应的 要连接到所述电容器的端子的负载。
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公开(公告)号：US20160028224A1
公开(公告)日：2016-01-28
申请号：US14877318
申请日：2015-10-07
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Ryuji YAMADA , Koji MARUYAMA , Takaaki TANAKA
CPC classification number: H02H9/02 , H02M3/156 , H02M7/487 , H02M7/537 , H02M2001/007 , Y02B70/1483
Abstract: A series circuit of capacitors and a series circuit of semiconductor switches such as SiC-MOSFETs are connected in parallel to a direct current power source, and one end of a bidirectional switch formed of semiconductor switches, such as IGBTs, and diodes, such as SiC-SBDs (Silicon Carbide Schottky Barrier Diodes), is connected to a series connection point (an M point) of the capacitors, while the other end of the bidirectional switch is connected to a series connection point of the semiconductor switches, in a three-level inverter that outputs three voltage levels by operating the semiconductor switches so as to satisfy at least one of the condition that the peak value of an alternating current output voltage Vo is a value of 80% or more of the voltage of the capacitors and the condition that an output power factor is 0.8 or more.
Abstract translation: 电容器的串联电路和诸如SiC-MOSFET的半导体开关的串联电路并联连接到直流电源，并且由诸如IGBT的半导体开关和诸如SiC的二极管形成的双向开关的一端 -SBD（碳化硅肖特基势垒二极管）连接到电容器的串联连接点（M点），而双向开关的另一端连接到半导体开关的串联连接点， 电平逆变器，其通过操作半导体开关输出三个电压电平，以满足以下条件中的至少一个：交流输出电压Vo的峰值为电容器的电压的80％以上的值，条件 输出功率因数为0.8以上。
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公开(公告)号：US20190068078A1
公开(公告)日：2019-02-28
申请号：US16018459
申请日：2018-06-26
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Satoru FUJITA , Ryuji YAMADA
Abstract: A power conversion device including an alternating current (AC) source, a plurality of switching units connected in series between positive and negative terminals of the AC source, each including a semiconductor switching element and having a load connected thereto, each switching unit outputting, to the load connected thereto, an input current from the AC source and a direct current (DC) output voltage that is generated through ON/OFF control of the semiconductor switching elements, a capacitor connected in parallel with the AC source and with the switching units, an inductor inserted between the capacitor and the switching units, and between the AC source and the switching units, a current measurement unit that measures a value of a current flowing from the AC source to the capacitor, and a control device that performs the ON/OFF control on the semiconductor switching elements on the basis of the measured current value.
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公开(公告)号：US20170302169A1
公开(公告)日：2017-10-19
申请号：US15641929
申请日：2017-07-05
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Ryuji YAMADA
Abstract: A power converting device, in one possible configuration, includes a chopper circuit with a first semiconductor switching device, a fast recovery diode, and an inductor of which one end is connected to a connection point connecting between the first semiconductor switching device and fast recovery diode; a series circuit, connected in parallel with the fast recovery diode, including a rectifying diode with a greater reverse recovery loss and a smaller forward voltage drop than those of the fast recovery diode, and a second semiconductor switching device. The second semiconductor switching device has a lower breakdown voltage and a smaller forward voltage drop than those of the first semiconductor switching device, is configured to turn on when the first semiconductor switching device is turned off, and is configured to turn off at a timing before the first semiconductor switching device shifts from an off-state to an on-state.
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