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公开(公告)号：US11496044B2
公开(公告)日：2022-11-08
申请号：US17142243
申请日：2021-01-06
摘要： The present disclosure provides a control method of a DC/DC converter and a related DC/DC converter. The control method allows for: detecting a difference between a first voltage and a second voltage; if an absolute value of the difference between the first voltage and the second voltage is greater than or equal to a preset value, reselecting desired operating states of respective switches in a 1-level state according to the difference between the first voltage and the second voltage and a direction of an average current from a fourth node to a first passive network in the 1-level state; and thus outputting a control signal to enable the voltage difference between the first capacitor and the second capacitor to be reduced, thereby effectively adjusting the neutral-point voltage balance of the DC/DC converter.
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公开(公告)号：US11496038B2
公开(公告)日：2022-11-08
申请号：US17383457
申请日：2021-07-23
摘要： The present application provides a conversion system and a control method, including N power converters and N controllers, where each power converter includes a first side and a second side, the first sides of the N power converters are electrically coupled in series, and currents flowing through the first sides of the N power converters are the same, the N controllers correspond to the N power converters one to one. Each controller contains a common-mode voltage loop and a current loop. The common-mode voltage loop is configured to receive a voltage reference signal and a voltage feedback signal, and output a given signal. The current loop is configured to receive the given signal, a current reference signal, and a first side current of a corresponding power converter, and output a common-mode control signal to modulate a first side voltage of the corresponding power converter.
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公开(公告)号：US11233462B2
公开(公告)日：2022-01-25
申请号：US17035749
申请日：2020-09-29
摘要： The present application provides a power converter and a power supply system, the power converter includes: a star/delta switching unit, a first power conversion unit, a second power conversion unit, a third power conversion unit, and a controller; AC terminals of the first power conversion unit, the second power conversion unit and the third power conversion unit are connected to a three-phase AC terminal through the star/delta switching unit, and DC terminals of the first power conversion unit, the second power conversion unit, and the third power conversion unit are connected to a DC power terminal; wherein the controller is configured to control the star/delta switching unit according to a signal reflecting a voltage of the DC power terminal, to form a star connection or a delta connection among the three-phase AC terminal and the first power conversion unit, the second power conversion unit and the third power conversion unit.
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公开(公告)号：US09837930B2
公开(公告)日：2017-12-05
申请号：US15131187
申请日：2016-04-18
发明人： Feiqin Hao , Hongyang Wu , Xiaoming Chen , Cheng Lu , Tao Ge
摘要： The present disclosure provides a power supply system and a power conversion device. The power conversion device is used for converting electric energy outputted by a power supply module, and the power conversion device includes an electric energy conversion module and a switching module. The electric energy conversion module is configured to convert the electric energy output from the power supply module into a single-phase two-wire output or a single-phase three-wire output, and includes a half-bridge circuit, a bridge conversion circuit and a neutral line. The switching module is coupled with the electric energy conversion module, and is configured to control the electric energy conversion module to provide the single-phase two-wire output or single-phase three-wire output.
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公开(公告)号：US11799393B2
公开(公告)日：2023-10-24
申请号：US17817656
申请日：2022-08-05
发明人： Hong Liu , Wen Zhang , Wenfei Hu , Cheng Lu , Hongyang Wu
IPC分类号： H02M7/493 , H02M7/5395 , H02M7/483 , H03K5/01
CPC分类号： H02M7/493 , H02M7/483 , H02M7/5395 , H03K5/01
摘要： The application provides a dispersed carrier phase-shifting method and system. The method includes connecting at least two power modules to form a modular system; each power module including a control module for sampling at least twice a common state variate, signs of slopes of the common state variate at a first and second sampling time are opposite, and a reference time of the first sampling time for each control module is the same; and regulating a carrier frequency of the power module according to a relative size between a sampled values at the first and second sampling time. According to embodiments herein, carrier phase-shifting of modular system may be implemented without communication between respective modules. Under closed-loop control, optimal carrier phase-shifting can be automatically achieved under various duty ratios, thereby having good stability.
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公开(公告)号：US11750088B2
公开(公告)日：2023-09-05
申请号：US17656213
申请日：2022-03-23
发明人： Cheng Lu , Hongyang Wu , Wenfei Hu
CPC分类号： H02M1/4233 , H02M7/219 , H02M7/487 , H02M1/4208
摘要： The application provides a method for controlling a PFC circuit including a diode bridge arm, DNPC bridge arm and capacitor group connected in parallel. The control method includes: switching working mode of the PFC circuit back and forth between first mode and third mode via second mode in each switching cycle when positive half cycle of a modulation wave is modulated, and switching working mode of the PFC circuit back and forth between sixth mode and fourth mode via fifth mode in each switching cycle when negative half cycle of the modulation wave is modulated. The durations of the second and fifth modes are as short as possible, thereby decreasing a current flowing into or out from midpoint of the capacitor group, and reducing voltage fluctuation at the midpoint. The application further provides a PFC circuit using the control method and a power conversion device having the PFC circuit.
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公开(公告)号：US11711019B2
公开(公告)日：2023-07-25
申请号：US17654068
申请日：2022-03-09
CPC分类号： H02M3/24 , H02M1/007 , H02M1/0074 , H02M1/14 , H02M3/1586
摘要： A method for controlling a power conversion system includes: configuring a carrier period of the power modules, and configuring a phase shift of carrier waves of the adjacent power modules to be 2π/N; selecting M power modules to operate within the carrier period, where O≤M≤N, and providing a modulation wave to the power modules, an amplitude of the modulation wave being A/N of a carrier peak of the carrier waves; and comparing the value of the modulation wave with a value of the carrier wave of each of the power modules, respectively, wherein, when the value of the modulation wave is greater than the value of the carrier wave, the corresponding power module runs; when the value of the modulation wave is less than or equal to the value of the carrier wave, the corresponding power module stops.
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公开(公告)号：US20220140739A1
公开(公告)日：2022-05-05
申请号：US17505439
申请日：2021-10-19
发明人： Hong Liu , Cheng Lu , Weiqiang Zhang
摘要： A power conversion system includes N power converters. Each power converter includes an input terminal, a first output terminal and a second output terminal. Each of the N power converters receives a DC power through the input terminal. The first output terminal of a first power converter and the second output terminal of an N-th power converter are connected in parallel to form an N-th total output terminal. The first output terminal of an i-th power converter and the second output terminal of an (i−1)-th power converter are connected in parallel to form an (i−1)-th total output terminal. The two input terminals of the load are connected with two total output terminals of N total output terminals. A (2k−1)-th power converter is connected with a first power source. A 2k-th power converter is connected with a second power source. The redundancy of the power conversion system can be achieved.
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公开(公告)号：US12132412B2
公开(公告)日：2024-10-29
申请号：US17820877
申请日：2022-08-18
发明人： Hong Liu , Hongyang Wu , Cheng Lu , Weiqiang Zhang , Xingkuan Guo
CPC分类号： H02M7/219 , H02M1/0067 , H02M1/0074
摘要： The present application provides a power supply apparatus, a three-phase power supply system and a control method, including N modules, where N is a positive integer greater than or equal to 2, and each module includes: a transformer, including a primary winding and a first secondary winding; and a first switch unit connected to the first secondary winding of the transformer, where primary windings of transformers of the N modules are connected in series, the first switch unit operates in one of a bypass mode, an open-circuit mode and a modulation mode, an output of each module is controlled by the first switch unit, so as to make the power supply apparatus provide voltages of different amplitudes according to power demand, and transformers with large volume and heavy weight, such as a centralized line frequency transformer or a multiple-winding transformer, are no longer required.
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公开(公告)号：US12027985B2
公开(公告)日：2024-07-02
申请号：US17505439
申请日：2021-10-19
发明人： Hong Liu , Cheng Lu , Weiqiang Zhang
CPC分类号： H02M3/33576 , H02J3/0073 , H02M1/007 , H02M7/23
摘要： A power conversion system includes N power converters. Each power converter includes an input terminal, a first output terminal and a second output terminal. Each of the N power converters receives a DC power through the input terminal. The first output terminal of a first power converter and the second output terminal of an N-th power converter are connected in parallel to form an N-th total output terminal. The first output terminal of an i-th power converter and the second output terminal of an (i−1)-th power converter are connected in parallel to form an (i−1)-th total output terminal. The two input terminals of the load are connected with two total output terminals of N total output terminals. A (2k−1)-th power converter is connected with a first power source. A 2k-th power converter is connected with a second power source. The redundancy of the power conversion system can be achieved.
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