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Patent Issued for Intelligent electric-vehicle charging station (USPTO 11318858)


China Business Day  

 

    2022 MAY 23 (NewsRx) -- By a News Reporter-Staff News Editor at China Business Day -- A patent by the inventors Chen, Peijun (Zhejiang, CN), He, Chunlin (Zhejiang, CN), Li, Yan (Zhejiang, CN), Wang, Weifu (Zhejiang, CN), Zheng, Zhengxian (Zhejiang, CN), Zhu, Jun (Zhejiang, CN), filed on October 12, 2019, was published online on May 3, 2022, according to news reporting originating from Alexandria, Virginia, by NewsRx correspondents.

    Patent number 11318858 is assigned to Hangzhou Power Supply Company of State Grid Zhejiang Electric Power (Zhejiang, People’s Republic of China).

    The following quote was obtained by the news editors from the background information supplied by the inventors: “With the rapid development of electric vehicles, the number of people who use electric vehicles is growing year by year and the charging demand of users is urgent. However, when the original distribution substations are designed and planned, charging facilities of electric vehicles are not incorporated into the capacity of distribution substations. The capacity of distribution substations in the related art cannot meet the fast-growing charging demand of charging facilities of electric vehicles. In addition, it is difficult to acquire land for construction of charging facilities at present. Thus, it is necessary to construct electric-vehicle charging stations based on integration of power transformation, distribution and charging in comprehensive view of regional power distribution capacity and charging requirements.

    “The charging strategies of conventional intelligent electric-vehicle charging stations are relatively single and cannot meet charging requirements in different situations. In addition, a charger usually cannot effectively guard against situations doing harm to charging safety during charging.”

    In addition to the background information obtained for this patent, NewsRx journalists also obtained the inventors’ summary information for this patent: “The present application provides an intelligent electric-vehicle charging station in comprehensive view of regional power distribution and charging power capacity, capable of charging using a plurality of strategies, applicable to charging requirements in different situations and capable of active safety protection by a charger during charging. The present application adopts the following technical solution: an intelligent electric-vehicle charging station. The charging station includes at least one charger. Each charger includes at least one power conversion unit and at least one charging terminal. Each power conversion unit includes an alternating-current power distribution module, a plurality of rectification modules, a switch matrix and a power controller. The alternating-current power distribution module is configured to supply power to a respective power conversion unit and the at least one charging terminal. The rectification modules are divided into a plurality of groups of modules. The plurality of groups of module assemblies is controlled, through the switch matrix, to be connected to a plurality of direct-current output circuits. Each direct-current output circuit is connected to one charging terminal. The switch matrix switches each group of module assemblies in the plurality of direct-current output circuits according to a control instruction of the power controller.”

    The claims supplied by the inventors are:

    “1. An intelligent electric-vehicle charging station, comprising at least one charger, wherein each of the at least one charger comprises at least one power conversion unit and at least one charging terminal; each of the at least one power conversion unit comprises an alternating-current power distribution module, a plurality of rectification modules, a switch matrix and a power controller, and the alternating-current power distribution module is configured to supply power to a respective power conversion unit and a respective charging terminal; and the plurality of rectification modules are divided into a plurality of groups of module assemblies, the plurality of groups of module assemblies is controlled, through the switch matrix, to be connected to a plurality of direct-current output circuits, each of the plurality of direct-current output circuits is connected to one charging terminal, and the switch matrix switches each of the plurality of groups of module assemblies in the plurality of direct-current output circuits according to a control instruction of the power controller; wherein the power controller is configured to issue a charging power allocation and load adjustment instruction according to one of the following charging strategies: (i) full-power orderly charging: each of the at least one power conversion unit is configured to output constant power to each of the at least one charging terminal, wherein each of the at least one charging terminal corresponds to one vehicle, a current charging terminal is configured to charge a current vehicle corresponding to the current charging terminal, and a charging terminal other than the current charging terminal is configured to do not charge a vehicle other than the current vehicle before charging of the current vehicle is finished; and during charging, in a case where charging power allocated by the power controller to the current vehicle includes redundant power and the redundant power is an integer multiple of power of one of the plurality of rectification modules, rectification modules having the redundant integer multiple of power are cut off one by one and the cut rectification modules is configured to enter a sequence of charging modules having idle power; and (ii) average-power charging: the at least one charging terminal comprises a plurality of charging terminals, each of the at least one power conversion unit is configured to output equal charging power to the plurality of charging terminals, each of the plurality of charging terminals corresponds to one vehicle, and the plurality of charging terminals are configured to simultaneously charge vehicles corresponding to the plurality of charging terminals; or (iii) free dynamic-power charging: after a to-be-charged vehicle enters a charging sequence, in a case where idle power of a power conversion unit is greater than or equal to required charging power of the to-be-charged vehicle, idle power matching the required charging power of the to-be-charged vehicle is outputted to charge the to-be-charged vehicle; in a case where the idle power of the power conversion unit is less than the required charging power of the to-be-charged vehicle, all of the idle power of the power conversion unit is outputted to charge the to-be-charged vehicle; after the to-be-charged vehicle enters the charging sequence, in a case where the power conversion unit has no idle power, a corresponding module assembly of a charging terminal corresponding to the to-be-charged vehicle is used to charge the to-be-charged vehicle; and during charging, in a case where charging power allocated to the to-be-charged vehicle includes redundant power and the redundant power is an integer multiple of power of one of the plurality of rectification modules, rectification modules having the redundant integer multiple of power are cut off one by one, the cut rectification modules are configured to enter a sequence of charging modules having idle power, and cut rectification modules are allocated, according to a first-in first-out principle, to charging terminals that need to charge vehicles and exclude charging terminals of the cut rectification modules so as to charge the vehicles that need to be charged.

    “2. The charging station of claim 1, wherein each of the at least one charging terminal comprises a charging column connected to one of the at least one power conversion unit, a charging cable connected to the charging column, and a vehicle plug connected to the charging cable; the charging column is provided with a charging controller, and the charging controller is configured to communicate with the one of the at least one power conversion unit and a battery management system of a vehicle respectively; the charging controller is provided with an active safety protection module, the active safety protection module is configured to monitor a power storage battery of the vehicle and a charging terminal, and take an active safety protection measure in a case where the power storage battery of the vehicle and the charging terminal satisfy an active safety protection condition during charging; the active safety protection condition comprises the following: a voltage of a single power storage battery is greater than a maximum allowable charging voltage threshold of the single power storage battery, a temperature of the power storage battery is greater than a maximum allowable temperature threshold of the power storage battery, a voltage output value of the charging terminal is greater than a maximum allowable charging voltage threshold of the charging terminal, a required charging voltage value of the vehicle is greater than a maximum allowable charging voltage threshold of the vehicle, or a charging voltage measurement value of the power storage battery is greater than a maximum allowable charging voltage threshold of the power storage battery, a current output value of the charging terminal is greater than a maximum allowable charging current threshold of the charging terminal, a required charging current value of the vehicle is greater than a maximum allowable charging current threshold of the vehicle, or a charging current measurement value of the power storage battery is greater than a maximum allowable charging current threshold of the power storage battery, an accumulated charging electric quantity of the charging terminal is greater than a total electric quantity indicated for the power storage battery, an absolute value of a difference between the charging voltage measurement value of the power storage battery and the voltage output value of the charging terminal is greater than a preset voltage threshold, an absolute value of a difference between the charging current measurement value of the power storage battery and the current output value of the charging terminal is greater than a preset current threshold, or a current state of charge (SOC) of the power storage battery remains unchanged within 5 min, and an estimated remaining charging time remains unchanged within 5 min; and the active safety protection measure comprises stopping charging within 1 s, disconnecting a low-voltage auxiliary power supply relay and a high-voltage direct-current contactor on a direct-current output circuit bus, and uploading alarm information.

    “3. The charging station of claim 1, wherein the alternating-current power distribution module comprises a circuit breaker, a contactor and a lightning protector; and a leakage protection switch is disposed at an output feed terminal and a direct-current fast-acting fuse is disposed at a charging connection output terminal to provide an overload and short-circuit protection.

    “4. The charging station of claim 1, wherein each of the at least one power conversion unit is provided with an input overvoltage or undervoltage protection module, and the input overvoltage or undervoltage protection module is configured to control respective rectification modules to shut down and raise an alarm in a case of an input overvoltage or undervoltage protection action; and each of the at least one power conversion unit is provided with an output overvoltage or overcurrent protection module, and the output overvoltage or overcurrent protection module is configured to control respective rectification modules to shut down and raise an alarm in a case of an output overvoltage or overcurrent protection action.

    “5. The charging station of claim 2, wherein the charging controller is configured to control a charger to stop charging and control the low-voltage auxiliary power supply relay and the high-voltage direct-current contactor on the direct-current output circuit bus to be disconnected within 100 ms when one of the following cases occurs during charging: a failure that the charger is incapable of continuing charging; triggering an emergency stop switch action; disconnecting a protective ground wire between the charger and the vehicle; or disconnecting a connection confirmation signal between the charger and the vehicle.

    “6. The charging station of claim 2, wherein the vehicle plug is provided with an electronic lock and a mechanical lock which are locked to a vehicle charging interface; in a case where the electronic lock is in a locked position, the mechanical lock is inoperable and the charging controller is configured to determine whether the electronic lock is reliably locked, and a charger stops charging or does not start charging in a case where the electronic lock is not reliably locked; and the electronic lock is automatically unlocked in a case where the charger is faulty and incapable of continuing charging.”

    There are additional claims. Please visit full patent to read further.

    URL and more information on this patent, see: Chen, Peijun. Intelligent electric-vehicle charging station. U.S. Patent Number 11318858, filed October 12, 2019, and published online on May 3, 2022. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=11318858.PN.&OS=PN/11318858RS=PN/11318858

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