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公开(公告)号：US12212250B2
公开(公告)日：2025-01-28
申请号：US17867827
申请日：2022-07-19
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Lin Ji , Kai Xin , Haibin Guo
Abstract: A control method of a three-phase multi-level inverter includes: determining a modulation ratio based on output of the three-phase multi-level inverter, where the modulation ratio indicates a ratio of an amplitude value of a sinusoidal modulation wave in pulse width modulation to an amplitude value of a carrier; generating, based on the modulation ratio and a modulation ratio threshold, a common-mode voltage regulation signal for regulating a common-mode voltage in phase voltages of the three-phase multi-level inverter; adding the common-mode voltage regulation signal and a differential-mode voltage regulation signal for regulating a differential-mode voltage in the phase voltages of the three-phase multi-level inverter to obtain a composite regulation signal, where the composite regulation signal is presented as a modulation wave for discontinuous pulse width modulation (DPWM); and generating, based on the composite regulation signal, drive signals for controlling switches of phases of the three-phase multi-level inverter.
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公开(公告)号：US20250023488A1
公开(公告)日：2025-01-16
申请号：US18780449
申请日：2024-07-22
Applicant: Inertech IP LLC
Inventor： Subrata K. Mondal
IPC: H02M7/483 , H02J7/00 , H02J9/00 , H02J9/06 , H02M1/00 , H02M1/04 , H02M1/08 , H02M3/155 , H02M3/158 , H02M3/335 , H02M7/487 , H02M7/527
Abstract: Systems and methods of this disclosure use low voltage energy storage devices to supply power at a medium voltage from an uninterruptible power supply (UPS) to a data center load. The UPS includes a low voltage energy storage device (ultracapacitor/battery), a high frequency (HF) bidirectional DC-DC converter, and a multi-level (ML) inverter. The HF DC-DC converter uses a plurality of HF planar transformers, multiple H-bridge circuits, and gate drivers for driving IGBT devices to generate a medium DC voltage from the ultracapacitor/battery energy storage. The gate drivers are controlled by a zero voltage switching (ZVS) controller, which introduces a phase shift between the voltage on the primary and secondary sides of the transformers. When the primary side leads the secondary side, the ultracapacitor/battery discharges and causes the UPS to supply power to the data center, and when the secondary side leads the primary side, power flows from the grid back to the UPS, thereby recharging the ultracapacitor/battery.
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公开(公告)号：US20250015717A1
公开(公告)日：2025-01-09
申请号：US18760044
申请日：2024-07-01
Applicant: SHANGHAI METAPWR ELECTRONICS CO., LTD
Inventor： Jianhong ZENG
Abstract: According to the six-switch flying capacitor voltage buck-type conversion circuit and the four-switch flying capacitor voltage buck-type conversion circuit applied to the intermediate bus converter, further optimization is provided. On one hand, a power conversion device is provided, the voltage peak of the switch is absorbed by optimizing the clamping circuit and the layout thereof, the voltage stress of the switch is reduced, no extra loss is generated, and the conversion efficiency of the power conversion device is improved. On the other hand, by optimizing the current sampling circuit, the monitoring and control performance related to the current is optimized, and the size of the power conversion device is reduced.
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公开(公告)号：US20250007421A1
公开(公告)日：2025-01-02
申请号：US18640673
申请日：2024-04-19
Applicant: Petróleo Brasileiro S.A. – Petrobras
Inventor： Emmanuel Cordeiro DIAS
Abstract: The present invention proposes a frequency inverter that provides sinusoidal output voltage without the need to use passive filters. The innovation consists of the use of strategically positioned diodes, inductors, capacitors and semiconductor switches. One of the diodes works to discharge both inductors. This innovation results in a reduction in the discharge current peaks of each inductor, which encounter two sources in series when they are in the discharge process, reduces a semiconductor element in the structure, and conditions the semiconductor switches to operate in non-dissipative switching ZVS (Zero Voltage Switching) and ZCS (Zero Current Switching) in most of the switching periods, which means that the frequency inverter being proposed has a much higher electrical performance and is compatible with commercial use. THD is also improved. The new topology being proposed makes it unnecessary to use filters at the inverter output and mitigates or eliminates problems such as motor burnout, acoustic noise, among others.
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公开(公告)号：US12183547B2
公开(公告)日：2024-12-31
申请号：US18005342
申请日：2021-07-06
Inventor： Jordi Everts , Noud Slaats
Abstract: A voltage waveform generator for a plasma assisted processing apparatus includes a common node, a voltage supply circuit operable to switch between at least two voltage levels at a first switch node, a first inductor connected between the first switch node and the common node, and a control unit configured to operate the voltage supply circuit.
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Patent Agency Ranking
公开(公告)号：US12160176B2
公开(公告)日：2024-12-03
申请号：US17876319
申请日：2022-07-28
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Motoyoshi Kubouchi
Abstract: A power converter, includes: a first line to which a first voltage is applied; a second line to which a second voltage lower than the first voltage is applied; a third line to which a third voltage lower than the second voltage is applied; a first bridge circuit that is provided between the first line and the second line, the first bridge circuit including a plurality of first switching elements; a second bridge circuit that is provided between the second line and the third line, the second bridge circuit including a plurality of second switching elements; and a voltage output circuit configured to generate a predetermined direct current (DC) voltage based on operations of the first and second bridge circuits.
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公开(公告)号：US20240396472A1
公开(公告)日：2024-11-28
申请号：US18797720
申请日：2024-08-08
Applicant: Huawei Digital Power Technologies Co., Ltd.
Inventor： Shen GAO , Fenglong LU , Shuai LIU , Lei SHI
IPC: H02M7/5387 , H02M7/487
Abstract: An inverter includes an inverter circuit, a collection circuit, a balanced circuit, and an inductor. The collection circuit is configured to detect a direct current bus voltage, to obtain end voltage values of a first capacitor and a second capacitor. The balanced circuit is configured to: when an end voltage value of a target capacitor is less than or equal to a first voltage threshold, control on or off of a plurality of switching transistors, to adjust a current for charging the target capacitor through the inductor and reduce a difference between the end voltage values of the target capacitor and a non-target capacitor in the two groups of capacitors. When the difference between the end voltage values of the two groups of capacitors in the inverter circuit is large, the balanced circuit may adjust an output current of the inductor to charge the target capacitor.
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公开(公告)号：US20240372483A1
公开(公告)日：2024-11-07
申请号：US18552864
申请日：2021-03-30
Applicant: ABB E-mobility B.V.
Inventor： Fu Yang , Yaming Shi
Abstract: A multi-level power convertor is provided. The multi-level power convertor includes a DC port, an AC port, a first power converting unit coupled to the DC port and including a first AC terminal adapted to provide a first plurality of voltage levels, a second power converting unit coupled to the DC port and including a second AC terminal adapted to provide a second plurality of voltage levels of the same number as the first plurality of voltage levels, a coupling inductor including first and second windings with the same number of turns, and an inductive filtering unit arranged between the AC port and the second and fourth ends of the first and second windings.
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公开(公告)号：US20240367252A1
公开(公告)日：2024-11-07
申请号：US18609467
申请日：2024-03-19
Applicant: ILLINOIS TOOL WORKS INC.
Inventor： James Frank Ulrich
Abstract: A welding-type power system than includes a power supply, a DC power bus, an energy storage device, and a bi-directional converter. The bi-directional converter configured to connect the DC power bus to the energy storage device, and further configured to convert power from the DC power bus to the energy storage device to charge the energy storage device, and to convert power from the energy storage device to the DC power bus in response to a power demand on the DC power bus. The bi-directional converter further configured to balance the DC power bus. A controller is configured to control the duty cycle of the bi-directional converter in order to balance the DC power bus, and control the flow of power between the energy storage device and the DC power bus.
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10.发明公开公开(公告)号：US20240348152A1
公开(公告)日：2024-10-17
申请号：US18280336
申请日：2022-12-28
Applicant: SHANDONG JIANZHU UNIVERSITY
Inventor： Changwei QIN , Xiaoyan LI , Zhiyuan CHU , Hongliang ZHANG , Yanfeng LI
IPC: H02M1/12 , H02M1/088 , H02M7/487 , H02M7/5395
CPC classification number: H02M1/123 , H02M1/088 , H02M7/487 , H02M7/5395
Abstract: A common-mode voltage suppression method includes: selecting two large and two small vectors with low common-mode voltage magnitudes as basic voltage vectors; writing a volt-second balance equation according to a selected basic voltage vectors, and calculating, an introduced distribution factor of duty cycles of small vectors, initial values of distribution factors of a duty cycle of each basic voltage vector and of small vectors; designing a neutral-point voltage balance controller to obtain and utilize a corrected value of the distribution factor of the duty cycles of the small vectors and the initial values and combine with a set neutral-point voltage balance control threshold to update the duty cycle of each basic voltage vector; and inserting shoot-through states into the small vectors, designing a switching sequence, converting the sequence into a driving signal of a power switch, and controlling an operation of the quasi-Z-source simplified three-level inverter.
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