Patent Application
20240034179
The instant application claims priority to European Patent Application No. 22186948.0, filed Jul. 26, 2022, which is incorporated herein in its entirety by reference.
The present disclosure generally relates to an electric vehicle fueling system, EVFS, and a corresponding method. In particular, the present disclosure relates to an EVFS with a super capacitor.
Electric vehicle fueling systems, EVFS, are used to charge electric vehicles. When the charging session is over and the electric vehicle is fully charged, the EVFS provides information about the amount of charged power as well as billing information.
The EVFS is usually supplied by the AC power of the electric grid that is also used to charge the electric vehicle. However, when the electric grid fails during a charging session, the EVFS shuts down and valuable information about the charging session is lost.
Thus, there is a need for an improved EVFS, in particular in a scenario of grid power failure. According to an aspect of the disclosure, an electric vehicle fueling system, EVFS, comprises: An alternating current, AC, grid input, configured to receive AC power from an electric grid. A main control chip, configured to control the EVFS to perform a charge session of an electric vehicle using the AC power. A power module connected to the grid input and configured to supply the main control chip with a supply power. A power loss detection module, wherein the power loss detection module is configured to provide a power loss signal, if the power loss detection module detects that the AC power is unavailable. The power module comprises a super capacitor, configured to store an auxiliary supply power, wherein the power module is configured to supply the main control chip with the auxiliary supply power. If the main control chip receives the power loss signal, the main control chip is configured to save session information of the charging session. The session information comprises information needed to continue or complete the charging session, in particular when the AC power is available again.
In other words, the super capacitor is configured to store energy. This stored energy is used to continue to provide supply power to the main control chip in the case of grid power loss. Thus, a shutdown of the main control chip can be delayed for a small period of time. During this period of time, the main control chip can save the session information needed to continue or complete the charging session, in particular for billing purpose, so that there will be no data loss and a transaction can be closed in time.
The term “charging session”, as used herein, relates to a process of charging an electric vehicle by the EVFS. The term “super capacitor”, as used herein, relates to a capacitor that is sized in a magnitude that allows to store enough energy to supply a control chip for a short amount of time to execute mandatory operations. Compared to compensation capacitors, the super capacitor has a significantly bigger capacitance.
Preferably, the main control chip comprises a general-purpose input/output pin, GPIO, wherein the power loss detection module is connected to the main control chip via the GPIO.
The improved EVFS provides a user a safe mechanism in case of blackout and power loss due to the upstream overload, in public charging station, it enables user to unplug the charging cable without physical intervention and provide more precise billing information when an ongoing charging session is stopped by the power loss.
Consequently, an improved EVFS is provided that uses a simple implementation to prevent loss of session information in the case of power grid failure.
The subject matter of the disclosure will be explained in more detail in the following text with reference to preferred exemplary embodiments, which are illustrated in the attached drawings.
The reference symbols used in the drawings, and their meanings, are listed in summary form in the list of reference symbols. In principle, identical assembly parts are provided with the same reference symbols in the figures. Preferably, the functional modules and/or the configuration mechanisms are implemented as programmed software modules or procedures, respectively; however, one skilled in the art will understand that the functional modules and/or the configuration mechanisms can be implemented fully or assembly partially in hardware.
The EVFS 100 further comprises a measurement module 90 is connected to the main control chip 30 and the AC power VAC. The measurement module 90 is configured to determine a quantity of charged AC power P of a charging session. In other words, the measurement module 90 monitors the AC power VAC during charging of the EV 300 and determines how much AC power VAC has been provided to the EV 300. Therefore, the measurement module 90 comprises a current sensor 93 and a voltage sensor 92, wherein the current sensor 93 measures the current of the AC power VAC over the time of charging, wherein the voltage sensor 92 measures the voltage of the AC power VAC over the time of charging. The voltage sensor 92 and the current sensor 93 are disposed between the power switch 50 and the AC grid output. The voltage sensor 92 and the current sensor 93 are connected a measurement chip 91 of the measurement module 90. The measurement chip 91 uses the provided voltage and current of the AC power VAC over time and determines the quantity of charged AC power P. The quantity of charged AC power P is provided to the main control chip 30, preferably in a predetermined sampling rate, for example once per second.
The EVFS 100 comprises a power module 20 that is connected to the AC grid input 10. The power module 20 is also connected to the main control chip 30 and is configured to supply the main control chip 30 with supply power VS. In this case, the power module 20 comprises an AC/DV-converter 21, which is configured to convert the AC power VAC into a DC power VDC. More specifically, the AC/DC-converter 21 comprises an 120-240V AC input that inputs the AC power VAC, and a 12 V DC output that outputs 12V of DC power VDC. As the main control chip 30 runs on 3.3V, the power module 20 comprises a DC/DC-converter 22 that comprises a 12V DC input that is connected to the 12V DC output of the AC/DC-converter, and a 3.3V DC output, in this case the supply power VS, that is connected to the main control chip 30. In other words, the power module 20 is configured to supply the main control chip 30 with supply power VS using the AC power VAC of the electric grid 200.
However, if the electric grid 200, or a connection to the electric grid 200, fails, the power module 20 is not able to provide supply power VS to the main control chip 30. Thus, not only the charging session of the EV 300 ends, but the main control chip 30 loses valuable information about the charging session. This information is referred to as session information IS and comprises for example the quantity of f charged AC power P already provided to the EV as well as the present price per unit of the AC power, VAC. Thus, necessary information for billing the charging session until the electric grid 200 fails might be lost.
Therefore, the power module 20 comprises a super capacitor 23 that is connected to the AC/DC-converter 21. When the AC power VAC is available, the power module 20 charges the super capacitor 23 with its 12V DC output. Consequently, the super capacitor 23 is a 12V capacitor. In order to provide the functionality of a short time energy source, the super capacitor 23 has a relatively high capacitance, for example 10000 uF.
If the AC power is unavailable, the DC output of the AC/DC-converter also falls down. The super capacitor 23 that is connected between the DC output of the AC/DC-converter and the DC input of the DC/DC-converter consequently, serves as a power supply until the super capacitor 23 is emptied. Thus, the DC/DC-converter can provide the main control chip 30 for a short time frame after the AC power becomes unavailable using the power stored in the super capacitor 23. This power is also referred to as auxiliary supply power. Due to the circuit as described, no further switching control has to be added to implement the described functionality.
However, the main control chip 30 needs to be aware that the AC power became unavailable in order to execute some last commands before shutting down. Thus, the EVFS 100 comprises a power loss detection module 40, which is connected to the AC power VAC and the main control chip 30. The power loss detection module 40 detects if the AC power VAC fails and becomes unavailable and provides a power loss signal SP to the main control chip 30. Thus, the main control chip 30 becomes aware that no AC power VAC is available and a shutdown of the EVFS and the main control chip 30 is imminent. At this point, the main control chip 30 is already supplied with supply power VS based on the super capacitor 23.
If the main control chip 30 receives the power loss signal SP, the main control chip 30 saves the session information IS. For example, the EVFS 100 comprises a storage unit 60, in particular a flash memory, into which the main control chip 30 saves the session information IS. Alternatively, or additionally, the EVFS 100 comprises a communication module 70, which is configured to transmit data to a backend server 400. Thus, the EVFS 100 transmits the session information IS to the backend server. Thus, when the AC power VAC will be available again, the main control chip 30 can read the session information IS from the storage unit 60 or from the backend server 400.
Thus, the EVFS 100 provides a simple implementation of an improved EVFS 100 that does not lose the session information IS in case of an electric grid failure.
In addition, the EVFS 100 comprises a display 80, in particular an LED display, which is configured to display the session information IS to a user, in particular the owner of the EV.
In a preferred embodiment, the super capacitor comprises a capacitance that allows to provide supply power to the main control chip to save the session information, if the AC power is unavailable.
Preferably, the super capacitor is configured to provide supply power to the main control chip if the AC power is unavailable for at least 3 seconds, further preferably for at least 5 seconds.
In a preferred embodiment, the super capacitor comprises a capacitance of at least 10000 uF.
Preferably, the super capacitor comprises a capacitance of at least 20000 uF, further preferably of 22000 uF, which can provide supply power to the main control chip for seconds if the AC power is unavailable.
Preferably, the super capacitor is a 12V DC capacitor.
In a preferred embodiment, the power module is configured to load the super capacitor using the AC power, if the AC power is available.
Thus, the super capacitor is fully charged when the electric grid is available.
In a preferred embodiment, the power module comprises an AC/DC-converter, connected to the AC grid input, wherein the AC/DC-converter is configured to convert the AC power into DC power, wherein the DC power is the supply power for the main control chip.
In other words, the AC/DC-converter is disposed between the AC grid input and the main control chip. The AC/DC-converter comprises an AC input, connected to the grid input, and a DC output, connected to the main control chip. The AC/DC-converter is configured to convert the AC power of the electric grid into DC power in order to power the main control chip.
Preferably, the AC/DC-converter allows an input of 120V-240V AC and provides a DC output of 12V.
Preferably, the power module comprises a DC/DC-converter, connected to the AC/DC-converter, wherein the DC/DC-converter is configured to convert the DC power into the supply power for the main control chip. In other words, the DC/DC converter comprises a DC input, connected to the DC output of the AC/DC converter, and a DC output, connected to the main control chip. The DC/DC-converter is configured to convert the DC power of the AC/DC-converter into the supply power for the main control chip. The DC/DC-converter is necessary, when the DC output of the AC/DC-converter does not comply with the specification of the main control chip. For example, the AC/DC-converter provides a 12V DC output, but the main control chip needs a 3.3V DC power supply. Consequently, the DC/DC-converter allows the power module to supply the main control chip with supply power using the grid power.
Preferably, the DC/DC-converter allows a DC input of 12V and provides a DC output of 12V.
In a preferred embodiment, the AC/DC-converter is connected to the super capacitor, wherein the AC/DC-converter is configured to load the super capacitor using the DC power.
The AC/DC-converter preferably comprises an AC-input that is connected to the AC grid input and a DC-output that is connected to the super capacitor.
In a preferred embodiment, the EVFS comprises a storage unit, connected to the main control chip, wherein saving the transaction information of the charge session comprises storing, by the main control chip, the transaction information in the storage module.
In a preferred embodiment, the EVFS comprises a communication module, connected to the main control chip, wherein saving the transaction information of the charge session comprises, instructing, by the main control chip, the communication module to transmit the transaction information to a backend server.
In a preferred embodiment, the communication module comprises a mobile radio module, a Wi-Fi module and/or an Ethernet module.
In a preferred embodiment, the storage module is flash memory.
Preferably, the storage module is on-chip flash memory of the main control chip. Alternatively, the storage module is flash memory that is separated from the main control chip.
In a preferred embodiment, the session information comprises a quantity of charged AC power and/or a price of the AC power.
In a preferred embodiment, the EVFS comprises a measurement module configured to determine the quantity of charged AC power. The measurement module is configured to provide the quantity of charged AC power to the main control chip.
Preferably, the measurement module is configured to measure a measured voltage and a measured current of the AC power over time and thus determines the quantity of charged AC power that the electric vehicle has been charged with.
In a preferred embodiment, the EVFS comprises a power switch, connected to the main control chip, wherein the power switch is configured to control an energy flow from the electric grid to the electric vehicle. The main control chip is configured to control the power switch.
In a preferred embodiment, the EVFS comprises a display module, connected to the main control chip, wherein the display module is configured to display the session information.
According to an aspect of the invention a method for operating an electric vehicle fueling system, EVFS, comprises the following steps. Receiving, by an AC grid input of the EVFS, AC power from an electric grid. Controlling, by a main control chip of the EVFS, the EVFS to perform a charge session of an electric vehicle using the AC power. Supplying, by a power module of the EVFS, connected to the grid input, the main control chip with a supply power. Detecting, by a power loss detection module of the EVFS, that the AC power is unavailable, and providing a power loss signal. Supplying, by a super capacitor of the power module, the main control chip with an auxiliary supply power. If the main control chip receives the power loss signal, saving, by the main control chip, session information of the charging session. The session information comprises information needed to continue or complete the charging session, in particular when the AC power is available again.
All references, including publications, patent applications, and patents, cited herein are hereby incorporated by reference to the same extent as if each reference were individually and specifically indicated to be incorporated by reference and were set forth in its entirety herein.
The use of the terms “a” and “an” and “the” and “at least one” and similar referents in the context of describing the invention (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The use of the term “at least one” followed by a list of one or more items (for example, “at least one of A and B”) is to be construed to mean one item selected from the listed items (A or B) or any combination of two or more of the listed items (A and B), unless otherwise indicated herein or clearly contradicted by context. The terms “comprising,” “having,” “including,” and “containing” are to be construed as open-ended terms (i.e., meaning “including, but not limited to,”) unless otherwise noted. Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., “such as”) provided herein, is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention.
Preferred embodiments of this invention are described herein, including the best mode known to the inventors for carrying out the invention. Variations of those preferred embodiments may become apparent to those of ordinary skill in the art upon reading the foregoing description. The inventors expect skilled artisans to employ such variations as appropriate, and the inventors intend for the invention to be practiced otherwise than as specifically described herein. Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context.
| Number | Date | Country | Kind |
|---|---|---|---|
| 22186948.0 | Jul 2022 | EP | regional |
