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公开(公告)号：US20240275305A1
公开(公告)日：2024-08-15
申请号：US18441451
申请日：2024-02-14
Applicant: North Carolina State University
Inventor： Wensong Yu
CPC classification number: H02M7/515 , H02J3/381 , H02M3/158 , H02M7/537 , H02J2300/26
Abstract: Various examples are provided related to photovoltaic systems that utilize multiple current source inverters. In one example, a solar inverter system includes DC-DC current source converters coupled to a DC link and a grid-frequency inverter coupled to the DC link. The DC power can be converted from energy obtained from a photovoltaic (PV) panel coupled to the DC-DC current source converters and the grid-frequency inverter can generate AC power from the DC power provided to the DC link.
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公开(公告)号：US20230088918A1
公开(公告)日：2023-03-23
申请号：US17946252
申请日：2022-09-16
Applicant: Solaredge Technologies Ltd.
Inventor： Tzachi Glovinsky , Yacov Rabiner , Yosef Lilintal
Abstract: A protection device is disclosed which may comprise a first sensor, a first switch or a controller. The first sensor may be coupled to a first busbar of busbars and may be configured to measure a respective first electrical characteristic of the first busbar. The first switch may be connected between the first busbar and a reference terminal. The first switch may be configured to connect or disconnect the first busbar to and from the reference terminal. The controller may be coupled to the first sensor and to the first switch and may be configured to control the first switch to connect the first busbar to the reference terminal (e.g., based on the measurement of the first electrical characteristic indicating a change in the first electrical characteristic).
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公开(公告)号：US11532996B2
公开(公告)日：2022-12-20
申请号：US16194884
申请日：2018-11-19
Applicant: Indian Institute of Technology Bombay
Inventor： Anshuman Shukla , Siba Kumar Patro
Abstract: Accordingly, the embodiments herein provide a hybrid modular multilevel converter. The hybrid modular multilevel converter includes one or more chain links, one or more high voltage switches and a plurality of inductors. The one or more chain links are formed by sub modules. The one or more high voltage switches are formed by semi-controlled devices or fully controlled or any other suitable semiconductor devices. The plurality of inductors are arranged in the one or more chain links to limit circulating current among the one or more chain links. The one or more chain links are configured to enhance a power handling capability of the hybrid modular multilevel converter.
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公开(公告)号：US20220200435A1
公开(公告)日：2022-06-23
申请号：US17428552
申请日：2020-01-22
Inventor： Akira YOSHITAKE , Tomomi KATO , Takuya KARIKAWA , Yoshinori NORITAKE
Abstract: A power converter for a power system performs power control of a power system by using a first control value derived based on a first stabilization command value for causing a voltage on a first DC bus to be within a first range and a first control command value different from the first stabilization command value. A power converter for a solar cell performs power control of a solar cell by using a second control value derived based on a second stabilization command value for causing a voltage on a second DC bus to be within a second range and a second control command value different from the second stabilization command value. The first range is narrower than the second range.
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公开(公告)号：US11147151B2
公开(公告)日：2021-10-12
申请号：US16405926
申请日：2019-05-07
Applicant: Shimadzu Corporation
Inventor： Yasuhiro Demura
IPC: H05G1/66 , H01J35/10 , H01J35/24 , H01J35/26 , H02M7/515 , H05G1/22 , H05G1/08 , H05G1/26 , H05G1/12 , H05G1/18 , H05G1/24 , H05G1/30 , H01J35/02 , H01J35/06 , H05G1/20 , H05G1/10 , H05G1/32
Abstract: A rotary anode driving device includes a DC power supply, an inverter circuit which is connected to the DC power supply and includes a plurality of switching elements and, the inverter circuit generates an AC voltage from a DC voltage of the DC power supply, and outputs the AC voltage to a stator coil which generates a rotating magnetic field of an X-ray tube; a pulse width modulation (PWM) waveform generator configured to generate an AC voltage of two phases or three phases as the AC voltage from the DC voltage by performing PWM control of the switching elements of the inverter circuit; and a capacitor connected in series to an input side of a stator coil of at least one phase of the stator coil, the capacitor having an electrostatic capacitance constituting a series resonant circuit with the stator coil to which the capacitor is connected.
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Patent Agency Ranking
公开(公告)号：US11146168B2
公开(公告)日：2021-10-12
申请号：US16910102
申请日：2020-06-24
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Ryuji Yamada
Abstract: Provided is a snubber circuit comprising N parallel charging paths each having a positive-side capacitor, a first diode, and a negative-side capacitor sequentially connected in series between a positive-side terminal and a negative-side terminal, and configured to conduct current from the positive-side terminal toward the negative-side terminal; (N+1) parallel discharging paths each having a second diode connected between the negative-side terminal or the negative-side capacitor of kth charging path of N charging paths and the positive-side capacitor of (k+1)th charging path of N charging paths or the positive-side terminal, and configured to counduct current from the negative-side terminal toward the positive-side terminal via at least one of the negative-side capacitor and the positive-side capacitor; and at least one auxiliary capacitor each being connected in parallel to at least one of the N first diodes included on N charging paths and (N+1) second diodes included on (N+1) discharging paths.
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公开(公告)号：US20200044581A1
公开(公告)日：2020-02-06
申请号：US16074098
申请日：2016-10-11
Inventor： Tsuguhiro TANAKA , Tatsuaki AMBO , Masahiro KINOSHITA
IPC: H02M7/515
Abstract: According to an embodiment of the invention, a power conversion device that includes a power converter, a direct current capacitor, a voltage sensor, a rectifying element, an electromagnetic contactor, and a control circuit is provided. The power converter includes a pair of direct current terminals connected to a direct current power supply, includes multiple alternating current terminals connected to an electric power system of alternating current, converts direct current power input from the direct current power supply into alternating current power, and supplies the alternating current power to the electric power system. The direct current capacitor is connected between the pair of direct current terminals. The voltage sensor detects a voltage value of the direct current capacitor. The rectifying element is provided between the direct current capacitor and the direct current power supply and suppresses a reverse flow of electrical power from the power converter and the direct current capacitor into the direct current power supply. The electromagnetic contactor is connected in parallel with the rectifying element. The control circuit controls operations of the power converter and the electromagnetic contactor. In the case where the voltage value of the direct current capacitor detected by the voltage sensor is a prescribed value or more, the control circuit engages the electromagnetic contactor and supplies active power from the power converter to the electric power system; and in the case where the voltage value of the direct current capacitor detected by the voltage sensor is less than the prescribed value, the control circuit opens the electromagnetic contactor and supplies a reactive power from the power converter to the electric power system.
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公开(公告)号：US10340845B2
公开(公告)日：2019-07-02
申请号：US16129811
申请日：2018-09-13
Applicant: OMRON Corporation
Inventor： Atsuo Minato , Katsumi Ohashi , Arata Yoneda , Kazumi Tsuchimichi , Katsutaka Tanabe , Junichiro Yamada , Yasuhiro Tsubota
Abstract: A voltage transform part transforms the direct-current power input to an input part. A first input and output part outputs the transformed direct-current power to a battery unit and to which direct-current power is input from the battery unit. A conversion part converts the direct-current power input to the input part into alternating-current power. A second input and output part outputs the alternating-current power to a power system or a load and to which an alternating-current power is input from the power system. The conversion part converts the alternating-current power input to the second input and output part into direct-current power. The second voltage transform part transforms the direct-current power converted by the conversion part and transforms the direct-current power input to the first input and output part. The conversion part converts the direct-current power transformed by the second voltage transform part into alternating-current power.
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公开(公告)号：US10283261B2
公开(公告)日：2019-05-07
申请号：US16051473
申请日：2018-07-31
Applicant: Delta Electronics, Inc.
Inventor： Da Jin , Yahong Xiong
Abstract: The present invention relates to a power conversion device, comprising: at least one resonant circuit comprising at least one resonant inductor and at least one resonant capacitor; a first transformer comprising a first primary winding which is electrically connected to the resonant circuit and at least one first secondary winding; and a second transformer comprising a second primary winding which is electrically connected to the resonant circuit and at least one second secondary winding, the second primary winding and the first primary winding are connected in parallel and have the same number of coil turns, and the second secondary winding and the first secondary winding have the same number of coil turns; an deviation of inductance between the first primary winding and the second primary winding meets |Lm1−Lm2|/(Lm1+Lm2)
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公开(公告)号：US20180287402A1
公开(公告)日：2018-10-04
申请号：US15473789
申请日：2017-03-30
Applicant: Gennady PLATONOV
Inventor： Gennady PLATONOV
CPC classification number: H02J7/0052 , H02J7/0057 , H02J7/082 , H02J2007/105 , H02M7/155 , H02M7/515
Abstract: A method and device is disclosed for charging and/or maintenance of lead-acid and alkaline accumulator batteries, allowing a charge, discharge, or recovery in control-conditioning cycles of these batteries. To increase efficiency of the battery recovery process, its charge is created by a reversible current in consecutive stages. Correction of the charging mode is provided based on voltage and temperature of the accumulator battery.
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