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公开(公告)号：US11557780B2
公开(公告)日：2023-01-17
申请号：US17233568
申请日：2021-04-19
发明人： Guoqiao Shen , Tsu-Hua Al , Jinfa Zhang
IPC分类号： H01M8/04 , H01M8/04858
摘要： An energy regulation method for a fuel cell energy supply system including a plurality of fuel cell power generation modules, a plurality of power conversion modules, and a communication control module connected to the plurality of power conversion modules includes: calculating a parameter average value based on an energy state parameter of the fuel cell power generation module; calculating a compensation factor depending on the energy state parameter and the parameter average value; calculating a control parameter reference value of each of the power conversion modules based on a droop algorithm, and multiplying the control parameter reference value by the corresponding compensation factor to obtain a control parameter set value of the power conversion module; and regulating the corresponding fuel cell power generation modules depending on the control parameter set value.
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公开(公告)号：US11451135B2
公开(公告)日：2022-09-20
申请号：US17158017
申请日：2021-01-26
发明人： Guoqiao Shen , Tengshen Zhang , Luping Cao
摘要： The disclosure provides a multilevel port under-voltage protection circuit with flying capacitor, comprising: a first circuit unit having first to fourth power switches sequentially connected in series, wherein the first circuit unit is arranged a positive terminal and a negative terminal of a DC input port and each of the switches can tolerate a reverse current; a first flying capacitor having a first terminal connected to the common node of the first power switch and the second power switch in series, and a second terminal connected to the common node of the third power switch and the fourth power switch in series; and a first shunt element connected in antiparallel to the first power switch or the fourth power switch, wherein a pulse peak current tolerated by the first shunt element is greater than the reverse current tolerated by the first power switch or the fourth power switch.
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公开(公告)号：US11502501B2
公开(公告)日：2022-11-15
申请号：US17104119
申请日：2020-11-25
发明人： Guoqiao Shen , Jinfa Zhang , Yuhu Zhou
摘要： The invention discloses an overcurrent protection circuit, coupled to a DC bus between first and second DC ends, the DC bus including positive bus and negative bus, and the circuit including: a main protection branch connected in series with the positive or negative bus, and including first and second protection switches connected in series and connected to a first node; a freewheeling switch branch having two ends, one end being connected to the first node, the other end being connected to an opposite bus to the main protection branch; a detection unit coupled to the DC bus for detecting a voltage or a current of the DC bus to output an overcurrent detection signal; and a control unit coupled to the detection unit and the main protection branch, and configured to control the main protection branch according to the overcurrent detection signal.
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公开(公告)号：US20210184594A1
公开(公告)日：2021-06-17
申请号：US17118961
申请日：2020-12-11
发明人： Guoqiao Shen , Guojin Xu , Ning He , Jinfa Zhang
摘要： A voltage balance control method for a flying-capacitor multilevel converter is provided. If the amplitude of the resultant current of the inductor currents from a plurality of output inductors is lower than or equal to a threshold current value, the flowing direction of the inductor current of at least one flying-capacitor multilevel branch circuit is controlled to be changed. Consequently, the problem of erroneously judging the current direction is avoided. Moreover, when the inductor current is low, the voltage of the flying capacitor is correspondingly controlled. Consequently, the voltage balance of the flying capacitor of the flying-capacitor multilevel converter can be achieved more easily.
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5.发明授权公开(公告)号：US11323030B2
公开(公告)日：2022-05-03
申请号：US16872366
申请日：2020-05-12
发明人： Guoqiao Shen , Jian Li , Guojin Xu , Jinfa Zhang
摘要： A control method for a DC/DC converter and a DC/DC converter are provided. The method includes: detecting an input voltage and an output voltage, and calculating a voltage gain according to a ratio of the output voltage to the input voltage; determining an operating mode of the DC/DC converter according to a first threshold and the voltage gain, and setting a first duty ratio and a second duty ratio according to the mode; detecting an inductor current to generate a current feedback signal, and then setting a regulation component according to the current feedback signal; regulating the first or second duty ratio according to the regulation component and generating driving signals to control the two groups of switches. The converter could operate in the Buck mode, Boost mode and Buck-Boost mode, and the voltage gain could be linearly continuous around 1.
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公开(公告)号：US11575264B2
公开(公告)日：2023-02-07
申请号：US17233522
申请日：2021-04-18
发明人： Guoqiao Shen , Changyong Wang , Jinfa Zhang
摘要： A distributed power supply system includes a plurality of energy modules, a plurality of power conversion modules, and a bus voltage controller. The energy modules are electrically connected to a DC bus via corresponding power conversion modules, and the bus voltage controller is connected to the power conversion modules. An energy regulation method includes: acquiring at least one energy state parameter of the corresponding energy module and computing a base value of the respective power conversion module; generating a normalized control signal based on a bus voltage of the DC bus and transmitting the control signal to the power conversion modules by the bus voltage controller; and obtaining a specified control reference value of the power conversion module depending on the control signal and the base value and regulating the corresponding energy module depending on the specified control reference value by the power conversion module.
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公开(公告)号：US11476751B2
公开(公告)日：2022-10-18
申请号：US17152747
申请日：2021-01-19
发明人： Yuhu Zhou , Haidong Chen , Guoqiao Shen , Jinfa Zhang
摘要： The present invention discloses a flying capacitor converter, a short circuit current suppression circuit for the same and an energy storage system. The flying capacitor converter comprises a controller, and has a high voltage side connected to a first power source and a low voltage side connected to a second power source. The short circuit current suppression circuit comprises: at least one current detection unit connected to the low voltage side and/or the high voltage side of the flying capacitor converter; and at least one switch set connected in series to the high voltage side and/or the low voltage side of the flying capacitor converter, wherein the controller controls the switch set to cut off a connection between the flying capacitor converter and the first power source and/or between the flying capacitor converter and the second power source, when the current detection unit detects a short circuit.
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公开(公告)号：US10056818B2
公开(公告)日：2018-08-21
申请号：US15657578
申请日：2017-07-24
发明人： Guojin Xu , Guoqiao Shen , Jinfa Zhang
CPC分类号： H02M1/00 , H02M3/00 , H02M3/158 , H02M2001/0003 , H02M2001/0074
摘要： A series-parallel converter system includes: a first set of parallel circuitries including a plurality of first circuitries in parallel with each other; a second set of parallel circuitries including a plurality of second circuits in parallel with each other, the second circuit being controlled in a second control method; wherein an input end of the first set of parallel circuitries and an input end of the second set of parallel circuitries are connected in series with an input power supply; and wherein the first circuitry in the first set of parallel circuitries includes: a first circuit being controlled in a first control method; and a first control circuitry electrically connected with the first circuit and configured to generate a first control signal for controlling the first circuit based on a variable intercept compensation, and an input voltage, a first output current and a virtual impedance of the first circuit.
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9.发明申请公开(公告)号：US20170310105A1
公开(公告)日：2017-10-26
申请号：US15465100
申请日：2017-03-21
发明人： Guoqiao Shen , Guojin Xu , Jinfa Zhang
CPC分类号： H02J1/14 , G05B15/02 , H02M7/483 , H02M2001/0025
摘要： A voltage balance control device and a voltage balance control method for a flying-capacitor multilevel converter are provided. A current direction forecasting unit acquires a voltage change amount of any selected flying capacitor of the flying-capacitor multilevel converter, and receives a feedback signal of two adjacent switch elements corresponding to the selected flying capacitor. A computing result is generated according to an average value or a cumulative value of the feedback signal in the adjusting period. After multiplication and/or division is performed on the voltage change amount and the computing result, the current direction can be forecasted according to the obtained sign. Consequently, the voltage balance of the flying capacitor of the flying-capacitor multilevel converter can be achieved.
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10.发明授权公开(公告)号：US12113431B2
公开(公告)日：2024-10-08
申请号：US17822439
申请日：2022-08-26
发明人： Guoqiao Shen , Jinfa Zhang
CPC分类号： H02M1/0095 , H02M1/327 , H02M3/003 , H02M3/07 , H02M3/1582 , H02M3/1584 , H05K7/20909
摘要： Disclosed is a flying capacitor three-level converter, including a plurality of circuit units, wherein each of the plurality of circuit units includes: an input capacitor; a bridge arm, electrically connected with the input capacitor in parallel, wherein the bridge arm includes a first switch, a second switch, a third switch and a fourth switch electrically and sequentially connected in series; and a flying capacitor unit, wherein the flying capacitor unit includes a first capacitor and a second capacitor, and the first capacitor and the second capacitor are electrically connected in parallel and electrically connected with a series branch in parallel, and the series branch includes the second switch and the third switch; wherein the input capacitor, the first switch, the first capacitor and the fourth switch form a first switching loop, and the second capacitor, the second switch and the third switch form a second switching loop.
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