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公开(公告)号：US12074431B2
公开(公告)日：2024-08-27
申请号：US17821521
申请日：2022-08-23
Applicant: ABB Schweiz AG
Inventor： Tero Viitanen
Abstract: A method for controlling a three-level brake chopper and a three-level brake chopper including, a first controllable semiconductor switch connected between a positive direct current pole and a first connection point, a second controllable semiconductor switch connected between the first connection point and a neutral direct current pole, a third controllable semiconductor switch connected between the neutral direct current pole and a second connection point, a fourth controllable semiconductor switch connected between the second connection point and a negative direct current pole, resistance means connected between the first connection point and the second connection point, and control means configured to control the second controllable semiconductor switch and the third controllable semiconductor switch into a conducting state in response to detecting a fault in the resistance means.
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公开(公告)号：US20240283240A1
公开(公告)日：2024-08-22
申请号：US18465741
申请日：2023-09-12
Applicant: KABUSHIKI KAISHA TOSHIBA
Inventor： Koutaro MIYAZAKI
CPC classification number: H02H7/122 , H02H1/0007
Abstract: An electronic circuitry includes: a comparison circuit to detect a first voltage at a first node relating to a first end of a semiconductor switching element and output a first signal in response to the first voltage larger than a predetermined voltage or equal to; a first filter including a first switch between the first node and a second end of the element, the first filter turning on the first switch for a first time based on a control signal indicating conduction of the element; and a second filter to, in response to the first signal output for at least a second time, generate a second signal indicating an overcurrent of the element, wherein the electronic circuitry changes at least one of: a first waveform related to driving of the semiconductor switching element based on the control signal; the second time; the first time; or the predetermined voltage.
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公开(公告)号：US12051895B2
公开(公告)日：2024-07-30
申请号：US18493557
申请日：2023-10-24
Applicant: BLOOM ENERGY CORPORATION
Inventor： Chaitanya Mandela , Prasad Pmsvvsv , Ranganathan Gurunathan , Vishal A. Gopalakrishnan , Ponkiran Ponnappan
CPC classification number: H02H7/122 , H02J3/0012
Abstract: An auxiliary circuit to inject fault current to a grid is provided. The circuit includes a pair of transformers including a first transformer and a second transformer, and a pair of SCRs including a first SCR and a second SCR. Each SCR remains in an OFF state and an ON state when AC voltage of the grid is in normal range and fault range, respectively. The circuit includes a capacitor electrically connected between the first transformer, the second transformer, and the first SCR. The circuit includes a diode biased by the second transformer and the capacitor to enable charging of the capacitor to a peak of AC voltage during one polarity of AC voltage when the AC voltage is in normal range. The capacitor discharges via the first SCR and the first transformer by injecting the fault current into the grid when the AC voltage is in the fault range.
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公开(公告)号：US20240195324A1
公开(公告)日：2024-06-13
申请号：US18584810
申请日：2024-02-22
Applicant: DENSO CORPORATION
Inventor： KUNIHIKO MATSUDA
IPC: H02M7/5387 , H02H7/122 , H02P27/06
CPC classification number: H02M7/53871 , H02H7/122 , H02P27/06
Abstract: A power supply apparatus includes a power converter, pull-up and pull-down resistors, a reverse-connection protective relay, a controller, and a dark current cut switch. The power converter includes upper-arm and lower-arm switching elements being connected in series between a power supply line and a ground line, and converts a DC power of a battery and supplies the converted DC power to a load. The pull-up resistor is connected between the power supply line and a common connection node between the upper-arm and lower-arm switching elements, and the pull-down resistor is connected between the common connection node and a ground. The reverse-connection protective relay cuts off a current from the power converter to the battery. The controller controls the power converter and the reverse-connection protective relay. The dark current cut switch cuts off a dark current flowing to the ground through the pull-up resistor and the pull-down resistor.
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公开(公告)号：US20240030703A1
公开(公告)日：2024-01-25
申请号：US18479625
申请日：2023-10-02
Applicant: Huawei Digital Power Technologies Co., Ltd.
Abstract: A photovoltaic inverter includes a capacitor bridge arm, an inverter bridge arm, and the fault protection apparatus. The capacitor bridge arm includes a positive electrode output port, a negative electrode output port, and a reference output port The inverter bridge arm includes a positive electrode input port, a negative electrode input port, and a reference input port. The positive electrode input port is connected to the positive electrode output port. The negative electrode input port is connected to the negative electrode output port. The reference input port is connected to the reference output port by using the fault protection apparatus. The fault protection apparatus is turned off based on a magnitude value or a variation of a voltage, or a magnitude value or a variation of a current between the reference input port and the positive electrode input port or the negative electrode input port.
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Patent Agency Ranking
公开(公告)号：US11721975B2
公开(公告)日：2023-08-08
申请号：US17302357
申请日：2021-04-30
Applicant: HIS MAJESTY THE KING IN RIGHT OF CANADA, AS REPRESENTED BY THE MINISTER OF NATURAL RESOURCES
Inventor： Khaled Saleh , Ali Mehrizi-Sani
Abstract: A system and method for controlling microgrids composed of inverter-based distributed generation (IBDG) units. This includes a method using multiple IBDGs to inject impedance-modulated harmonic currents during fault conditions, with each IBDG injecting a unique, differentiable harmonic (i.e., non-fundamental) order from neighboring IBDGs. The method also involves using an inverse time-harmonic-current characteristic to detect faults by locally measuring the harmonic currents injected by IBDGs. A harmonic directional overcurrent relay is also used for fault detection.
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公开(公告)号：US11705720B2
公开(公告)日：2023-07-18
申请号：US17664163
申请日：2022-05-19
Applicant: University of Tennessee Research Foundation
Inventor： Fei Wang , Edward A. Jones
IPC: H02H7/122 , H02H7/12 , H02M1/08 , H02H1/00 , H01L29/778 , H02H7/125 , H02M1/32 , H01L29/20 , H01L29/417 , H01L29/10 , H02M1/00
CPC classification number: H02H7/1213 , H01L29/7787 , H02H1/0007 , H02H7/122 , H02H7/125 , H02M1/08 , H02M1/32 , H01L29/1066 , H01L29/2003 , H01L29/41766 , H02M1/0009
Abstract: A power converter circuit includes a switch including a field effect transistor, the field effect transistor being a wide bandgap field effect transistor and being configured to maintain an on operational state responsive to a maintenance signal received through a gate terminal, a current sensing circuit that is configured to estimate a drain terminal current of the field effect transistor responsive to a voltage between the gate terminal of the field effect transistor and a source terminal of the field effect transistor, and a gate driving circuit that is configured to generate the maintenance signal responsive to the estimate of the drain terminal current.
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公开(公告)号：US20230223897A1
公开(公告)日：2023-07-13
申请号：US18184992
申请日：2023-03-16
Applicant: Solaredge Technologies Ltd.
Inventor： Yakir Loewenstern , Ilan Yoscovich , David Braginsky , Tzachi Glovinsky , Izak Assia , Roy Shkoury
IPC: H02S40/34 , H02S50/10 , H02M3/145 , H02H7/20 , H02H9/02 , H02M7/48 , H02S40/36 , H02H7/122 , H02M3/158 , H02H7/12 , H02H3/08
CPC classification number: H02S40/34 , H02S50/10 , H02M3/145 , H02H7/20 , H02H9/02 , H02M7/48 , H02S40/36 , H02H7/122 , H02M3/158 , H02H7/1213 , H02H3/08
Abstract: Various implementations described herein are directed to a methods and apparatuses for disconnecting, by a device, elements at certain parts of an electrical system. The method may include measuring operational parameters at certain locations within the system and/or receiving messages from control devices indicating a potentially unsafe condition, disconnecting and/or short-circuiting system elements in response, and reconnection the system elements when it is safe to do so. Certain embodiments relate to methods and apparatuses for providing operational power to safety switches during different modes of system operation.
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公开(公告)号：US11695268B2
公开(公告)日：2023-07-04
申请号：US17379158
申请日：2021-07-19
Applicant: MINEBEA MITSUMI Inc.
Inventor： Hiroyuki Kato , Toshikazu Koshiba
CPC classification number: H02H7/0833 , H02H7/122 , H02H9/025 , H02M1/32 , H02M3/07 , H02M7/5387 , H02P27/06
Abstract: A protection function of an electronic device is realized with a lower cost. A load drive circuit 102 includes: transistors Qa and Qb for protection of an N-channel type connected between a power source terminal P1 and a power source end P7 for driving; an inverter circuit 14 that drives a load based on an input drive control signal Sd, the inverter circuit 14 being disposed between the power source end P7 for driving and a ground potential; and a booster unit 16 including a capacitor C1 having one terminal connected to an output end of the inverter circuit 14, the booster unit 16 generating, across another terminal of the capacitor C1, a voltage exceeding a power source voltage Vdc, and applying the voltage to control electrodes of the transistors Qa and Qb for protection.
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公开(公告)号：US09997904B2
公开(公告)日：2018-06-12
申请号：US15016185
申请日：2016-02-04
Applicant: LSIS CO., LTD.
Inventor： Hong-Seok Kim , Chun-Suk Yang
Abstract: Disclosed herein is a method for controlling a trip event of an inverter by taking into account the temperature of the inverter. The method includes: sensing a change in temperature of the inverter for an overload current measurement time using the temperature sensing circuit; determining an amount of heat emitted from the inverter based on the change in temperature; determining an electrical energy of the inverter consumed for the overload current measurement time; determining a compensation reference time based on the amount of heat and the electrical energy; and comparing the compensation reference time with the overload current measurement time to trip the inverter. As a result, the actual temperature of the inverter measured when the inverter is in operation is reflected, so that the trip event of the inverter can be controlled more accurately.
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