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公开(公告)号：EP4068599A1
公开(公告)日：2022-10-05
申请号：EP22162908.2
申请日：2022-03-18
发明人： SHI, Ling , HU, Wenfei , LIU, Hong , LU, Cheng
摘要： A method for controlling a distributed power conversion system comprises: configuring N control units for controlling N power modules of the system respectively, wherein each of the control units is configured to execute: step S1, generating a first variable Q1 reflecting respective module serial numbers R according to a coordination variable; step S2, generating a second variable Q2 reflecting the optimal operating number M of the modules; and step S3, comparing the first variable Q1 and the second variable Q2, wherein, when the first variable Q1 is greater than the second variable Q2, the corresponding power module stops; and when the first variable Q1 is less than or equal to the second variable Q2, the corresponding power module runs.
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公开(公告)号：EP4142085A1
公开(公告)日：2023-03-01
申请号：EP22190986.4
申请日：2022-08-18
发明人： LIU, Hong , ZHANG, Wen , HU, Wenfei , LU, Cheng , WU, Hongyang
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：EP4000997A1
公开(公告)日：2022-05-25
申请号：EP21198105.5
申请日：2021-09-21
发明人： LU, Cheng , LIU, Hong , HU, Wenfei , KONG, Jie
摘要： Embodiments of the present invention provide a power conversion system and a control method. The power conversion system includes multiple power modules, and each power module includes a first port, a second port, and a third port, where the first port of each power module is connected to an external device, second ports of the power modules are independent of each other and used as independent ports to output power, third ports of the power modules are connected in parallel to form a power bus and power flow of the third port of each power module is bidirectional. Therefore, when loads of output ports are imbalanced, the power bus formed by the third ports connected in parallel realizes power regulating among multiple power modules, so that power input into the power modules through first ports is as equal as possible, which reduces or eliminates a DC link voltage balance problem caused by load imbalance.
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公开(公告)号：EP3852262A1
公开(公告)日：2021-07-21
申请号：EP21151833.7
申请日：2021-01-15
发明人： LU, Cheng , HU, Wenfei
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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5.发明公开
公开(公告)号：EP4228135A1
公开(公告)日：2023-08-16
申请号：EP23155582.2
申请日：2023-02-08
发明人： LIU, Hong , SONG, Baihui , ZHANG, Wen , HU, Wenfei , LU, Cheng
摘要： The disclosure discloses a method for estimating parameters of a resonant converter (100). The resonant converter (100) has a first port (101), a second port (102), and a resonant tank (10) that includes an equivalent resonant capacitor ( C r ) and an equivalent resonant inductor ( L r ), the method including: estimating a second voltage estimation value ( v oEst ) of the second port (102), an equivalent resonant capacitor estimation value, and/or an equivalent resonant inductor estimation value of the resonant converter (100) according to a first voltage ( V in ) of the first port (101), an equivalent resonant capacitor voltage ( v Cr ) and an equivalent resonant inductor current ( i Lr ) of at least three effective points, wherein the points have different coordinates on a state plane of the equivalent resonant capacitor voltage ( v Cr ) and the equivalent resonant inductor current ( i Lr ), and are on a state trajectory formed by the equivalent resonant capacitor voltage ( v Cr ) and the equivalent resonant inductor current ( i Lr ), and the points are not central symmetric about a center of the state trajectory.
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公开(公告)号：EP4195480A1
公开(公告)日：2023-06-14
申请号：EP22211402.7
申请日：2022-12-05
发明人： LIU, Hong , SONG, Baihui , HU, Wenfei , LU, Cheng , WU, Hongyang
摘要： The application discloses a resonant converter and a method for controlling the same. The resonant converter includes: a resonant tank, a first circuit electrically connected to a first end of the resonant tank, and a second circuit electrically connected to a second end of the resonant tank; the first circuit including at least one primary switch, the second circuit including at least one controllable switch, and controlling the at least one controllable switch according to a secondary initial switching frequency, such that the second circuit outputs power, adjusting a secondary switching frequency of the at least one controllable switch according to the secondary initial switching frequency and a signal reflecting the power of the second circuit, such that the secondary switching frequency of the second circuit follows a primary switching frequency of the first circuit.
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公开(公告)号：EP4191851A1
公开(公告)日：2023-06-07
申请号：EP22208789.2
申请日：2022-11-22
发明人： LIU, Hong , ZHANG, Wen , HU, Wenfei , LU, Cheng , WU, Hongyang , SONG, Baihui
摘要： The application provides a cascade system distributed control method and device. The method including: taking an output of a closed-loop control for regulating an AC current of the power module as a reference value of a bridge arm voltage; according to the reference value of the bridge arm voltage to obtain an amplitude of the bridge arm voltage, taking the amplitude of the bridge arm voltage as a feedback signal, and after closed-loop control and regulation together with the AC current of the power module, adjusting the reference value of the bridge arm voltage; and controlling the bridge arm voltage according to the reference value of the bridge arm voltage, wherein in at least one working mode of the cascade system, a change of parameters reflecting an active current has a monotonic relation with a change of the amplitude of the bridge arm voltage.
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公开(公告)号：EP4068600A1
公开(公告)日：2022-10-05
申请号：EP22163483.5
申请日：2022-03-22
发明人： HU, Wenfei , SHI, Ling , LIU, Hong , LU, Cheng
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 0≤ 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：EP3683945A1
公开(公告)日：2020-07-22
申请号：EP20152059.0
申请日：2020-01-15
发明人： HU, Wenfei , LU, Cheng
摘要： The present disclosure relates to a control method of a DC/DC converter (100). The DC/DC converter (100) includes: a first capacitor (CI) and a second capacitor (C2) coupled to a first node (N1); a five-port network (11) coupled to the first to fifth nodes; a transformer (12) electrically connected to the fourth and fifth nodes; and a secondary side circuit (13) electrically connected to a secondary winding of the transformer and coupled to a load; the control method includes: controlling, when the load is less than a preset value, switching states of multiple switches in the secondary side circuit, causing the transformer to be short-circuited for at least a first time period during a phase of stopping energy transmission; and controlling switching states of multiple switches in the five-port network during the first time period, causing current to flow from the five-port network to the first node or flow from the first node to the five-port network.
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公开(公告)号：EP3683944A1
公开(公告)日：2020-07-22
申请号：EP20152039.2
申请日：2020-01-15
发明人： HU, Wenfei , LU, Cheng
摘要： A DC/DC converter includes a first capacitor and a second capacitor coupled to a first node, a first switch and a second switch coupled between the first node and a second node, a third switch and a fourth switch coupled between the first node and a third node, a first passive network coupled between a fourth node and a fifth node, the first passive network connecting the fourth node and the fifth node in series to a primary winding of a transformer, and a secondary side circuit coupled to a secondary winding of the transformer; a control method of the DC/DC converter includes: adjusting a phase shift angle between control signals of the first switch and the fourth switch to reduce a voltage difference between the first capacitor and the second capacitor.
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