Patents by Inventor Feidong XU

Feidong XU has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 12348042
    Abstract: A photovoltaic energy storage system and a control method for the photovoltaic energy storage system are provided. The photovoltaic energy storage system includes an energy storage unit, a photovoltaic array assembly, an inverter and a rapid shutdown switch. The inverter is electrically coupled to the energy storage unit and the photovoltaic array assembly. The rapid shutdown switch is electrically coupled to the inverter, a power grid and a load. A detecting and controlling circuit of the inverter detects at least two of a first voltage, a second voltage and a third voltage, and determines whether the rapid shutdown switch is turned off according to the detected voltages and a reference value. When it is determined that the rapid shutdown switch is turned off, a connection between the inverter and the energy storage unit and a connection between the inverter and the photovoltaic array assembly are cut off.
    Type: Grant
    Filed: January 6, 2022
    Date of Patent: July 1, 2025
    Assignee: Delta Electronics (Shanghai) Co., Ltd.
    Inventors: Jixing Qiu, Shen Chen, Feidong Xu
  • Publication number: 20250158517
    Abstract: A control method for a resonant converter is provided. The primary-secondary phase shift angle is adjusted according to a variable dead zone. Consequently, the output current approaches to the reference current, and the deviation between the theoretical zero crossing value and the actual zero crossing value is reduced. In this way, the resonant converter of the present disclosure can be turned on in a zero-voltage switching manner within a wide voltage range.
    Type: Application
    Filed: November 12, 2024
    Publication date: May 15, 2025
    Inventors: Feidong Xu, Bin Wang, Xiaoping Wang, Weiyi Zheng
  • Publication number: 20250158516
    Abstract: The present disclosure provides a control method applicable for a resonant converter. The control method includes steps of: (a) determining a voltage gain of the resonant converter according to the input voltage, a turn ratio of the transformer and the output voltage, and determining a resonant frequency according to an inductance of the resonant inductor and a capacitance of the resonant capacitor; (b) determining an output current of the resonant converter according to the switching frequency, the voltage gain and the resonant frequency; and (c) adjusting the switching frequency when the output current is not equal to a reference current, and performing the step (b) again.
    Type: Application
    Filed: October 28, 2024
    Publication date: May 15, 2025
    Inventors: Bin Wang, Weiyi Zheng, Yuxi Wang, Feidong Xu
  • Publication number: 20250158518
    Abstract: A bidirectional resonant converter includes a first port, a second port, a first circuit, a resonant circuit, a transformer, a second circuit and a selection unit. The transformer includes a plurality of primary windings. The resonant circuit comprise a plurality of resonant branches. Each resonant branch is electrically connected with at least one primary winding. The plurality of resonant branches and the corresponding primary windings are collaboratively formed as a plurality of connection paths. The selection unit is electrically connected with the plurality of connection paths, and selects at least one connection path from the plurality of connection paths. A resonant cavity between the first circuit and the transformer is formed. The resonant cavity is selected according to the working mode, and the parameters of the resonant cavity are correspondingly changed.
    Type: Application
    Filed: November 12, 2024
    Publication date: May 15, 2025
    Inventors: Feidong Xu, Bin Wang, Xiaoping Wang, Weiyi Zheng
  • Patent number: 12095309
    Abstract: The application discloses an automatic transfer switch and a power supply system. The automatic transfer switch includes: a first switch unit having a first end connected to a first device through a converter port, and a second end electrically connected to a power grid through a power grid port; a second switch unit having a first end connected to a second device through an electric vehicle port and a charging/discharging circuit unit, and a second end electrically connected to the second end of the first switch unit; a third switch unit, having a first end electrically connected to the power grid through the power grid port, and a second end electrically connected to a load through a load port; a sampling unit; and a control unit connected to the sampling unit.
    Type: Grant
    Filed: December 1, 2022
    Date of Patent: September 17, 2024
    Assignee: Delta Electronics (Shanghai) Co., Ltd.
    Inventors: Feidong Xu, Mengsheng Wu, Mengyu Liang
  • Publication number: 20240283250
    Abstract: The application provides an interaction system between an electric vehicle and a power grid, including the electric vehicle including: a battery, and an on board charger including a bidirectional power conversion circuit connected to the battery and an on board charger controller; an electric vehicle supply equipment including: a charge and discharge connection device including a first contactor connected between the power grid and the bidirectional power conversion circuit; and an interaction communication system including: an electric vehicle communication controller, a supply equipment communication controller, and the on board charger controller controlling the bidirectional power conversion circuit; wherein, the supply equipment communication controller indirectly communicates with the on board charger controller via the electric vehicle communication controller through a first communication channel, and the supply equipment communication controller further directly communicates with the on board charger
    Type: Application
    Filed: February 6, 2024
    Publication date: August 22, 2024
    Inventors: Feidong XU, Lei JIA, Mengyu LIANG, Juiyuan HSU
  • Publication number: 20240195178
    Abstract: A power conversion device and a control method thereof are provided. The power conversion device includes a three-level inverter, positive and negative DC terminals, first and second capacitors, a balance circuit, a bidirectional DC-DC converter and a controller. The three-level inverter has two DC terminals coupled to the positive and negative DC terminals respectively. Two terminals of the first capacitor are coupled to the positive DC terminal and a capacitor midpoint respectively. Two terminals of the second capacitor are coupled to the capacitor midpoint and the negative DC terminal respectively. The balance circuit is electrically connected between the positive and negative DC terminals and has a neutral terminal electrically connected to the capacitor midpoint. The bidirectional DC-DC converter is electrically connected to the DC terminals.
    Type: Application
    Filed: December 7, 2023
    Publication date: June 13, 2024
    Inventors: Feidong Xu, Bin Wang, Yueran Zhang, Heng Wang
  • Patent number: 11881815
    Abstract: The application provides a photovoltaic inverter system, an automatic locating method of RSDs and a fault control method thereof. The automatic locating method comprises turning off all RSDs and sampling a voltage of an output end of each RSD as a first voltage before an inverter operates; turning on any one of the RSDs and sampling a voltage of the output end of each RSD as a second voltage, determining all RSDs in a photovoltaic module string to which the RSD in a turned-on state belongs according to the first voltage and the second voltage, and repeating the above control method for any one of the RSDs outside the photovoltaic module string to which the determined RSDs belong until corresponding connection relations between all RSDs and all photovoltaic module strings are determined.
    Type: Grant
    Filed: April 25, 2022
    Date of Patent: January 23, 2024
    Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.
    Inventors: Chengjun He, Feidong Xu, Xuancai Zhu
  • Patent number: 11799296
    Abstract: An islanding detection system and method for multiple inverters operating in parallel, wherein the multiple inverters at least comprises a first inverter and a second inverter connected in parallel. The islanding detection system comprises a current detection circuit arranged on a grid side or an AC side of the second inverter; and a controller connected to the current detection circuit and the first inverter. The controller determines whether to perform distributed islanding detection or centralized islanding detection on the first inverter and the second inverter according to a grid voltage signal and a current detection signal of the current detection circuit. By recognizing the islanding detection mode of the second inverter, matching it with typical islanding detection modes preset in a library, and determining to perform a distributed or centralized islanding detection according to matching results, the application improves the success ratio of islanding detection.
    Type: Grant
    Filed: November 8, 2021
    Date of Patent: October 24, 2023
    Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.
    Inventors: Shen Chen, Feidong Xu, Xuancai Zhu
  • Publication number: 20230231409
    Abstract: The application discloses an automatic transfer switch and a power supply system. The automatic transfer switch includes: a first switch unit having a first end connected to a first device through a converter port, and a second end electrically connected to a power grid through a power grid port; a second switch unit having a first end connected to a second device through an electric vehicle port and a charging/discharging circuit unit, and a second end electrically connected to the second end of the first switch unit; a third switch unit, having a first end electrically connected to the power grid through the power grid port, and a second end electrically connected to a load through a load port; a sampling unit; and a control unit connected to the sampling unit.
    Type: Application
    Filed: December 1, 2022
    Publication date: July 20, 2023
    Inventors: Feidong XU, Mengsheng WU, Mengyu LIANG
  • Publication number: 20220368282
    Abstract: The application provides a photovoltaic inverter system, an automatic locating method of RSDs and a fault control method thereof. The automatic locating method comprises turning off all RSDs and sampling a voltage of an output end of each RSD as a first voltage before an inverter operates; turning on any one of the RSDs and sampling a voltage of the output end of each RSD as a second voltage, determining all RSDs in a photovoltaic module string to which the RSD in a turned-on state belongs according to the first voltage and the second voltage, and repeating the above control method for any one of the RSDs outside the photovoltaic module string to which the determined RSDs belong until corresponding connection relations between all RSDs and all photovoltaic module strings are determined.
    Type: Application
    Filed: April 25, 2022
    Publication date: November 17, 2022
    Inventors: Chengjun HE, Feidong XU, Xuancai ZHU
  • Publication number: 20220239107
    Abstract: A photovoltaic energy storage system and a control method for the photovoltaic energy storage system are provided. The photovoltaic energy storage system includes an energy storage unit, a photovoltaic array assembly, an inverter and a rapid shutdown switch. The inverter is electrically coupled to the energy storage unit and the photovoltaic array assembly. The rapid shutdown switch is electrically coupled to the inverter, a power grid and a load. A detecting and controlling circuit of the inverter detects at least two of a first voltage, a second voltage and a third voltage, and determines whether the rapid shutdown switch is turned off according to the detected voltages and a reference value. When it is determined that the rapid shutdown switch is turned off, a connection between the inverter and the energy storage unit and a connection between the inverter and the photovoltaic array assembly are cut off.
    Type: Application
    Filed: January 6, 2022
    Publication date: July 28, 2022
    Inventors: Jixing Qiu, Shen Chen, Feidong Xu
  • Publication number: 20220190604
    Abstract: An islanding detection system and method for multiple inverters operating in parallel, wherein the multiple inverters at least comprises a first inverter and a second inverter connected in parallel. The islanding detection system comprises a current detection circuit arranged on a grid side or an AC side of the second inverter; and a controller connected to the current detection circuit and the first inverter. The controller determines whether to perform distributed islanding detection or centralized islanding detection on the first inverter and the second inverter according to a grid voltage signal and a current detection signal of the current detection circuit. By recognizing the islanding detection mode of the second inverter, matching it with typical islanding detection modes preset in a library, and determining to perform a distributed or centralized islanding detection according to matching results, the application improves the success ratio of islanding detection.
    Type: Application
    Filed: November 8, 2021
    Publication date: June 16, 2022
    Inventors: Shen CHEN, Feidong XU, Xuancai ZHU
  • Patent number: 11309789
    Abstract: The invention discloses an inverter and a soft-start method for the same. The inverter is electrically connected between a DC power supply and a grid and includes a main power circuit electrically coupled to the grid through a relay, a filter, the relay, and a controller electrically connected with the main power circuit and the relay, respectively. The soft-start method includes: sampling a grid voltage of the grid; calculating an output voltage of the controller, and calculating a virtual current based on the output voltage of the controller, the grid voltage and a virtual impedance; and performing current closed-loop control by taking the virtual current as a feedback signal and sending a relay control signal to turn on the relay when a steady state is reached. The invention enables the soft start of the inverter without increasing any hardware circuit, such as a starting resistor, or the like.
    Type: Grant
    Filed: September 18, 2020
    Date of Patent: April 19, 2022
    Assignee: Delta Electronics (Shanghai) Co., Ltd.
    Inventors: Qikang Wei, Feidong Xu, Xuancai Zhu
  • Patent number: 11175316
    Abstract: A method for identifying type of a grid automatically and an inverter device thereof are provided. The inverter device comprises a power line L1, a power line L2, a neutral line N and a ground line electrically connectable to a first power line, a second power line, a neutral line and a ground line of the grid, respectively. The method comprises: sampling at least two of voltages between L1 and L2, between L1 to N and between L2 to N when the two neutral lines are connected, and identifying the type of the grid based on the sampling result; and sampling the voltage between L1 and L2 when the two neutral lines are not connected, sampling at least one of a voltage between L1 and GND and between L2 and GND with cooperation of a grid-connected switching unit, and identifying the type of the grid based on the sampling results.
    Type: Grant
    Filed: January 6, 2020
    Date of Patent: November 16, 2021
    Assignee: Delta Electronics (Shanghai) Co., Ltd.
    Inventors: Qikang Wei, Feidong Xu, Xuancai Zhu
  • Publication number: 20210135563
    Abstract: The invention discloses an inverter and a soft-start method for the same. The inverter is electrically connected between a DC power supply and a grid and includes a main power circuit electrically coupled to the grid through a relay, a filter, the relay, and a controller electrically connected with the main power circuit and the relay, respectively. The soft-start method includes: sampling a grid voltage of the grid; calculating an output voltage of the controller, and calculating a virtual current based on the output voltage of the controller, the grid voltage and a virtual impedance; and performing current closed-loop control by taking the virtual current as a feedback signal and sending a relay control signal to turn on the relay when a steady state is reached. The invention enables the soft start of the inverter without increasing any hardware circuit, such as a starting resistor, or the like.
    Type: Application
    Filed: September 18, 2020
    Publication date: May 6, 2021
    Inventors: Qikang WEI, Feidong XU, Xuancai ZHU
  • Patent number: 10897241
    Abstract: A hysteresis control method for inverter and an inverter based on hysteresis control are disclosed. The inverter is electrically connected to a power grid, and the method includes: Step S1, sampling a grid voltage Vg(z) and an output current Ig(z) of the inverter; Step S2, calculating a present period hysteresis bandwidth H(z) based on the grid voltage Vg(z) sampled in step S1; Step S3, predicting a next period hysteresis bandwidth H(z+1); Step S4, correcting the present period hysteresis bandwidth H(z) based on the next period hysteresis bandwidth H(z+1) obtained in step S3, to obtain a final hysteresis bandwidth Hout(z); and Step S5, controlling an output driving signal according to the output current Ig(z) of the inverter and the final hysteresis bandwidth Hout(z) to control the operation of the inverter.
    Type: Grant
    Filed: December 17, 2019
    Date of Patent: January 19, 2021
    Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.
    Inventors: Qikang Wei, Feidong Xu, Xuancai Zhu
  • Publication number: 20200341750
    Abstract: A method of upgrading inverter software comprises: embedding a software upgrade package for software to be upgraded into an application package, and uploading the application package to a server; obtaining the application package from the server through a terminal and sending the application package to an inverter, wherein the terminal and the inverter are connected through a wireless communication; in an operating cycle, determining by the inverter whether current time is within a predetermined time window, and if the current time is within the predetermined time window, performing a next operation, and if the current time is not within the predetermined time window, entering a next operating cycle; obtaining version information of the software of the inverter to be upgraded; and if the version information of the software to be upgraded is lower than that of the application package, performing an upgrade operation.
    Type: Application
    Filed: July 9, 2020
    Publication date: October 29, 2020
    Applicant: Delta Electronics (Shanghai) CO., LTD
    Inventors: Shen CHEN, Feidong XU, Xuancai ZHU
  • Publication number: 20200264215
    Abstract: A method for identifying type of a grid automatically and an inverter device thereof are provided. The inverter device comprises a power line L1, a power line L2, a neutral line N and a ground line electrically connectable to a first power line, a second power line, a neutral line and a ground line of the grid, respectively. The method comprises: sampling at least two of voltages between L1 and L2, between L1 to N and between L2 to N when the two neutral lines are connected, and identifying the type of the grid based on the sampling result; and sampling the voltage between L1 and L2 when the two neutral lines are not connected, sampling at least one of a voltage between L1 and GND and between L2 and GND with cooperation of a grid-connected switching unit, and identifying the type of the grid based on the sampling results.
    Type: Application
    Filed: January 6, 2020
    Publication date: August 20, 2020
    Inventors: Qikang WEI, Feidong XU, Xuancai ZHU
  • Publication number: 20200228102
    Abstract: A hysteresis control method for inverter and an inverter based on hysteresis control are disclosed. The inverter is electrically connected to a power grid, and the method includes: Step S1, sampling a grid voltage Vg(z) and an output current Ig(z) of the inverter; Step S2, calculating a present period hysteresis bandwidth H(z) based on the grid voltage Vg(z) sampled in step S1; Step S3, predicting a next period hysteresis bandwidth H(z+1); Step S4, correcting the present period hysteresis bandwidth H(z) based on the next period hysteresis bandwidth H(z+1) obtained in step S3, to obtain a final hysteresis bandwidth Hout(z); and Step S5, controlling an output driving signal according to the output current Ig(z) of the inverter and the final hysteresis bandwidth Hout(z) to control the operation of the inverter.
    Type: Application
    Filed: December 17, 2019
    Publication date: July 16, 2020
    Inventors: Qikang WEI, Feidong XU, Xuancai ZHU