Apparatus and method for charging electric vehicle

Abstract

An apparatus for charging an electric vehicle, according to an embodiment, may comprise: a case having a vent through which air moves; a cooling fan mounted on at least one side of the case so that air is introduced and discharged through the vent; a temperature and humidity sensor disposed to be adjacent to the vent at one side of the case so as to measure external temperature and humidity; and a control unit for receiving the external temperature and humidity information, calculating, on the basis of the external temperature and external humidity information, a condition under which condensation occurs in the case, and controlling the operation of the cooling fan on the basis of the condition.

Description

Electric vehicle charging device and method

[0001] The embodiment relates to cooling fan control of an electric vehicle charging device.

[0002] In general, automobiles have established themselves as a representative means of transportation through continuous development and improvement, and recently, various types of automobiles have appeared, including large luxury models as well as economical compact cars.

[0003] Recently, with global environmental regulations strengthening and energy cost reductions trending, demand for environmentally friendly electric vehicles (EVs) is increasing. In the US and Europe, the introduction of air conservation laws mandates the distribution of EVs. Accordingly, interest in and research on green cars (eco-friendly vehicles) are actively underway in Korea as part of the low-carbon, green growth movement.

[0004] Additionally, as electric vehicles become more widespread, charging devices to charge the batteries of electric vehicles are being installed in buildings and public facilities.

[0005] In conventional charging devices, the internal temperature rises rapidly when the electric vehicle changes from standby to charging, and a cooling fan is installed to prevent the internal temperature from rising.

[0006] However, since the cooling fan mounted on the charging device is simply operated without considering temperature and humidity, the lifespan of the cooling fan may be shortened or condensation may occur inside the charging device, which may cause damage to hardware components or fire due to high current inside the charging device.

[0007] The purpose of the present invention is to provide an electric vehicle charging device and method for preventing condensation from forming inside the charging device.

[0008] In addition, the embodiment has another purpose of providing an electric vehicle charging device and method for preventing shortening of the lifespan of a cooling fan mounted inside the charging device.

[0009] In order to solve the above problem, an electric vehicle charging device according to an embodiment may include a case having a ventilation hole through which air moves, a cooling fan mounted on at least one side of the case to draw in and draw out air through the ventilation hole, a temperature and humidity sensor positioned adjacent to the ventilation hole on one side of the case to measure external temperature and humidity, and a control unit that receives information on the external temperature and humidity, calculates conditions under which condensation occurs within the case based on the external temperature and external humidity information, and controls the operation of the cooling fan based on the conditions.

[0010] The electric vehicle charging device further includes a storage unit in which hygroscopic air lead information is stored, and the control unit can compare the external temperature and humidity information with the hygroscopic air lead information to determine conditions under which condensation occurs within the case.

[0011] The device further includes a communication unit that receives charging status information including a power-on signal, a charging preparation signal, a charging start signal, and a charging end signal, and the control unit can control the cooling fan to operate by setting the RPM differently based on the charging status information.

[0012] The control unit may control the cooling fan to operate at a first RPM when the power-on signal is received while the external temperature has a temperature value between a first temperature and a second temperature, determine whether the humidity corresponds to a condition for condensation to occur within the case when the charge preparation signal is received, and control the cooling fan to operate at a second RPM greater than the first RPM when the humidity is equal to or greater than the first humidity corresponding to a condition for condensation to occur within the case.

[0013] The above control unit can control the cooling fan to operate at a first RPM when the humidity is less than the first humidity.

[0014] The above control unit can control the cooling fan to operate at a third RPM lower than the second RPM when the charging start signal is received.

[0015] The control unit may control the cooling fan to operate at a fourth RPM lower than the first RPM when the power-on signal is received while the external temperature is lower than the first temperature, and may control the cooling fan to operate at a second RPM higher than the fourth RPM when the charge preparation signal is received.

[0016] The above control unit can control the cooling fan to operate at a fifth RPM lower than the second RPM when the charging start signal is received.

[0017] The cooling fan includes a first cooling fan for drawing in the air and a second cooling fan for drawing out the air, and the temperature and humidity sensor can be installed adjacent to the first cooling fan.

[0018] In addition, in order to solve the above problem, the electric vehicle charging method according to the embodiment may include a step of receiving external temperature and humidity information, a step of calculating a condition for condensation to occur within the electric vehicle charging device based on the external temperature and humidity information, and a step of controlling the operation of the cooling fan based on the condition.

[0019] The step of calculating the above conditions can calculate the conditions under which condensation occurs within the case by comparing the external temperature and humidity information with the psychrometric chart information.

[0020] The method further includes a step of receiving a power-on signal, a charge preparation signal, a charge start signal, and a charge end signal, and the step of controlling the operation of the cooling fan may include: when the power-on signal is received while the external temperature has a temperature value between a first temperature and a second temperature, controlling the cooling fan to operate at a first RPM; when the charge preparation signal is received, determining whether the humidity corresponds to a condition in which condensation occurs within the case; and when the humidity is equal to or greater than the first humidity corresponding to a condition in which condensation occurs within the case, controlling the cooling fan to operate at a second RPM greater than the first RPM.

[0021] The step of controlling the operation of the cooling fan may control the cooling fan to operate at a first RPM when the humidity is less than the first humidity.

[0022] The step of controlling the operation of the cooling fan may include controlling the cooling fan to operate at a fourth RPM lower than the first RPM when the power-on signal is received while the external temperature is lower than the first temperature, and controlling the cooling fan to operate at a second RPM higher than the fourth RPM when the charge preparation signal is received.

[0023] The step of controlling the operation of the cooling fan may control the cooling fan to operate at a fifth RPM lower than the second RPM when the charging start signal is received.

[0024] The embodiment can prevent condensation from occurring inside the charging device by controlling the RPM of the cooling fan in consideration of the external temperature and humidity.

[0025] In addition, the embodiment can prevent damage to the cooling fan by operating it with different RPMs set according to the charging status information.

[0026] Fig. 1 is a cross-sectional view showing an electric vehicle charging device according to an embodiment.

[0027] Fig. 2 is a schematic diagram showing a control unit of an electric vehicle charging device according to an embodiment.

[0028] Figure 3 is a drawing showing a moisture air direction graph stored in a storage unit according to an embodiment.

[0029] Fig. 4 is a flowchart showing a process of operating a cooling fan based on charging status information according to an embodiment.

[0030] Figure 5 is a flowchart showing a process of operating a cooling fan based on external temperature and humidity information according to an embodiment.

[0031] Figures 6 to 9 are flowcharts showing an electric vehicle charging method according to an external temperature value according to an embodiment.

[0032] Hereinafter, embodiments will be described in detail with reference to the attached drawings. The embodiments may be modified in various ways and take various forms. Therefore, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the embodiments to a specific disclosed form, but rather to encompass all modifications, equivalents, and alternatives within the spirit and technical scope of the embodiments.

[0033] While terms like "first" and "second" may be used to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another. Furthermore, terms specifically defined in light of the configuration and operation of the embodiments are intended only to describe the embodiments and do not limit the scope of the embodiments.

[0034] In the description of the embodiments, when it is described as being formed "on or under" each element, "on or under" includes both cases where two elements are directly in contact with each other or where one or more other elements are formed by being positioned indirectly between the two elements. In addition, when expressed as "on or under," it can include the meaning of not only the upward direction but also the downward direction based on one element.

[0035] Additionally, relational terms such as “upper / upper / above” and “lower / lower / below” used hereinafter may be used to distinguish one entity or element from another, without necessarily requiring or implying any physical or logical relationship or order between such entities or elements.

[0036] Fig. 1 is a cross-sectional view showing an electric vehicle charging device according to an embodiment.

[0037] Referring to FIG. 1, an electric vehicle charging device (100) according to an embodiment may include a case (110), a cooling fan (130), a temperature and humidity sensor (150), and a control unit (170).

[0038] The case (110) may be formed into a polygonal shape and may be provided with a power module (120) capable of charging an electric vehicle. The power module (120) may be connected to the battery of the electric vehicle through a charging nozzle (not shown). The shape of the case (110) is not limited and may be formed into various shapes.

[0039] The case (110) may be formed with ventilation holes (111, 113) to allow external air to pass through the interior. The ventilation holes (111, 113) may include a first ventilation hole (111) through which air is drawn in, formed on one side of the case (110), and a second ventilation hole (113) through which air is drawn out, formed on the other side of the case (110). The second ventilation hole (113) may be formed by dividing into two ventilation holes, but the number is not limited.

[0040] The cooling fan (130) may be arranged adjacent to the ventilation holes (111, 113). The cooling fans (130, 140) may be formed in multiple numbers. The cooling fans (130, 140) may include a first cooling fan (130) that draws in outside air. The first cooling fan (130) may be mounted on one side of the case adjacent to the first ventilation hole (111). The cooling fans (130, 140) may include a second cooling fan (140) that extracts internal air. The second cooling fan (140) may be mounted on the other side of the case adjacent to the second ventilation hole (113). The second cooling fan (140) may be formed by dividing into two cooling fans, but the number is not limited.

[0041] The temperature and humidity sensor (150) can measure external temperature and humidity simultaneously. The temperature and humidity sensor (150) can be installed inside the case (110). The temperature and humidity sensor (150) can be positioned adjacent to the first ventilation hole (111) through which air is introduced. The temperature and humidity sensor (150) can measure external temperature and humidity more effectively by being positioned adjacent to the first ventilation hole (111) through which external air is introduced. The mounting location of the temperature and humidity sensor (150) is not limited and can be positioned adjacent to the second ventilation hole (113).

[0042] The control unit (170) can be mounted on the rear inner surface of the case (110). The control unit (170) can control the entire operation related to electric vehicle charging.

[0043] The control unit (170) can control the RPM of the cooling fan (130, 140) to prevent the life of the cooling fan (130, 140) from being shortened.

[0044] The control unit (170) can control the speed of the cooling fan (130, 140) to prevent condensation from occurring inside the case (110) during charging. For example, the control unit (170) can calculate the conditions under which condensation occurs inside the case (110) based on external temperature and humidity information. The control unit (170) can control the operation of the cooling fan (130, 140) based on whether the calculated conditions are applicable.

[0045] Although not shown, the front of the case (110) may be equipped with a payment unit and a display device. The payment unit may be configured to accept coins or banknotes, or payment via an RFID (Radio Frequency Identification Card).

[0046] The display device can display information such as the remaining charging time, elapsed charging time, or the amount of charging power during charging. The display device can be equipped with a touch display and receive user input. User input can include, but is not limited to, charging start, charging-related request information, etc.

[0047] Fig. 2 is a schematic diagram showing a control unit of an electric vehicle charging device according to an embodiment.

[0048] Referring to FIG. 2, the control unit (170) of the electric vehicle charging device according to the embodiment may include a storage unit (171), a communication unit (173), and a processor (175).

[0049] The storage unit (171, Memory) may store information related to electric vehicle charging and control programs for performing electric vehicle charging and cooling fan control. The storage unit (171) may be main memory accessed and used by the processor (175). For example, the storage unit (171) may be volatile memory such as DRAM. In another embodiment, the storage unit (171) may be permanent memory, and the permanent memory may be, for example, NVDIMM.

[0050] The storage unit (171) may store external temperature and humidity measured by a temperature and humidity sensor, internal case temperature, component temperature inside the charging device, and moisture map information. Here, the moisture map information may be information configured as a graph or a table of graphs. The internal case temperature and the component temperature inside the charging device may be stored as values ​​preset by the user. Alternatively, the internal case temperature and the component temperature inside the charging device may be obtained by installing a separate thermometer inside the case.

[0051] Hygrometer information can be used as an indicator to calculate the conditions under which condensation will occur within the case using external temperature and humidity.

[0052] Figure 3 is a drawing showing a moisture air direction graph stored in a storage unit according to an embodiment.

[0053] As illustrated in Figure 3, when matching the hygroscopic data under conditions of an external temperature of 13°C and a humidity of 60%, condensation can occur when an object with a temperature of 5°C or lower comes into contact with the case. In other words, if there is an 8°C difference between the external temperature and the temperature of the internal components, condensation can occur inside the case.

[0054] Returning to FIG. 2, the communication unit (173) may be a device including hardware and software necessary for wired and wireless connection with other network devices. The communication unit (173) may also transmit and receive data signals or control signals related to electric vehicle charging.

[0055] The communication unit (173) can receive external temperature and humidity information. The communication unit (173) can receive a power-on signal, a charging preparation signal, a charging start signal, and a charging end signal.

[0056] The communication unit (173) can perform communication using not only LTE and 5G, but also LPWN (Low Power Wireless Network) and LPWAN (Low Power Wide Area Network) such as NB-IoT, LoRa, SigFox, and LTE-CAT1.

[0057] The communication unit (173) can perform communication using a communication method that utilizes not only a wired LAN (Local Area Network) but also a wireless LAN such as WiFi 802.11a / b / g / n. In addition, the communication unit (173) can also perform communication with internal or external devices using a communication method such as NFC or Bluetooth.

[0058] The processor (175) is a type of central processing unit that can control the entire operation related to electric vehicle charging and cooling fans.

[0059] The processor (175) may include all types of devices capable of processing data. Here, the term 'processor' may refer to a data processing device built into hardware, for example, having a physically structured circuit to perform a function expressed by a code or command included in a program. Examples of data processing devices built into hardware include, but are not limited to, a microprocessor, a central processing unit (CPU), a processor core, a multiprocessor, an application-specific integrated circuit (ASIC), and a field programmable gate array (FPGA).

[0060] Below, the electric vehicle charging method performed by the processor of the control unit will be described in detail.

[0061] Fig. 4 is a flowchart showing a process of operating a cooling fan based on charging status information according to an embodiment.

[0062] As illustrated in FIG. 4, the control unit can receive charging status information (S100). The charging status information can include a power-on state, a charging preparation state, a charging state, and a charging completion state.

[0063] Charging status information can be determined from signals sensed by internal components of an electric vehicle charging device or signals input by a user.

[0064] The control unit can set the RPM of the cooling fan differently based on the charge status information (S110). The RPM of the cooling fan can be set by adjusting the duty ratio of the current supplied to the cooling fan.

[0065] The control unit can set the RPM of the cooling fan by adjusting the duty ratio to 10% to 30% when a power-on signal is received and the power is turned on. The control unit can set the RPM of the cooling fan by adjusting the duty ratio to 60% to 100% when a charging start signal is received and charging starts. Here, the external temperature condition can be a state exceeding 40℃, a state between 28℃ and 40℃ or lower, a state between 12℃ and 28℃ or lower, or a state below 12℃, and the RPM of the cooling fan can be set to different conditions depending on the external temperature condition.

[0066] The control unit can operate the cooling fan according to the charging status information and the set RPM (S130).

[0067] The control unit may operate the cooling fan at a preset RPM for a first period of time in a power-on state. The first period of time may include, for example, three minutes, but is not limited thereto. The control unit may operate the cooling fan at a preset RPM for a second period of time in a charge-off state. The second period of time may include, for example, ten minutes, but is not limited thereto.

[0068] Figure 5 is a flowchart showing a process of operating a cooling fan based on external temperature and humidity information according to an embodiment.

[0069] As shown in Fig. 5, the control unit can receive external temperature and humidity information from a temperature and humidity sensor (S200).

[0070] The control unit can calculate the conditions under which condensation occurs within the case of the charging device (S210). The control unit can calculate the conditions under which condensation occurs within the case by matching external temperature and humidity information to a hygroscopic air temperature chart.

[0071] The control unit can control the operation of the cooling fan based on conditions that cause condensation to occur inside the case (S230). For example, if conditions that cause condensation to occur while the cooling fan is in operation are met, the control unit can control the RPM of the cooling fan to increase the RPM of the cooling fan.

[0072] As mentioned above, increasing the RPM of the cooling fan can prevent condensation from forming inside the case.

[0073] Figures 6 to 9 are flowcharts showing an electric vehicle charging method according to an external temperature value according to an embodiment.

[0074] As illustrated in Fig. 6, the control unit can receive external temperature and humidity from a temperature and humidity sensor (S300). Here, the external temperature may be a temperature exceeding 40 degrees.

[0075] The control unit can check whether a power-on signal has been received (S310). If the power-on signal has not been received, the control unit can perform a process of receiving external temperature and humidity.

[0076] The control unit can control the cooling fan to turn on when a power-on signal is received and the power is turned on (S320).

[0077] The control unit can control the cooling fan to operate at a first RPM by setting the duty ratio of the current supplied to the cooling fan to, for example, 30%. The control unit can operate the cooling fan for a first period of time, for example, 5 minutes.

[0078] The control unit can check whether a charging preparation signal has been received (S330).

[0079] The control unit can control the cooling fan to maintain the first RPM when a charging preparation signal is received and the charging preparation state is established (S340).

[0080] The control unit can check whether a charging start signal has been received (S350).

[0081] When a charging start signal is received and the charging state is established, the control unit can control the cooling fan to operate at the second RPM by setting the duty ratio of the current supplied to the cooling fan to, for example, 1000% (S360).

[0082] The control unit can check whether a charging end signal has been received (S370).

[0083] When a charging end signal is received and the charging end state is reached, the control unit can operate the cooling fan for a second period of time, for example, 10 minutes, and then turn it off (S380).

[0084] In the above, the control unit can continuously monitor the conditions under which condensation occurs within the case of the charging device using humidity information.

[0085] As illustrated in Fig. 7, the control unit can receive external temperature and humidity from a temperature and humidity sensor (S400). Here, the external temperature may be between 20 degrees and 40 degrees.

[0086] The control unit can check whether a power-on signal has been received (S410). If the power-on signal has not been received, the control unit can perform a process of receiving external temperature and humidity.

[0087] The control unit can control the cooling fan to turn on when a power-on signal is received and the power is turned on (S420).

[0088] The control unit can control the cooling fan to operate at a third RPM by setting the duty ratio of the current supplied to the cooling fan to, for example, 20%. The control unit can operate the cooling fan for a third period of time, for example, 5 minutes.

[0089] The control unit can check whether a charging preparation signal has been received (S430).

[0090] The control unit can control the cooling fan to maintain the third RPM when a charging preparation signal is received and the charging preparation state is established (S440).

[0091] The control unit can check whether a charging start signal is received (S450).

[0092] When a charging start signal is received and the charging state is established, the control unit can control the cooling fan to operate at the 4th RPM by setting the duty ratio of the current supplied to the cooling fan to, for example, 800% (S460).

[0093] The control unit can check whether a charging end signal has been received (S470).

[0094] When a charging end signal is received and the charging end state is reached, the control unit can operate the cooling fan for a fourth period of time, for example, 10 minutes, and then turn it off (S480).

[0095] In the above, the control unit can continuously monitor the conditions under which condensation occurs within the case of the charging device using humidity information.

[0096] As illustrated in Fig. 8, the control unit can receive external temperature and humidity from a temperature and humidity sensor (S500). Here, the external temperature may be between 12 degrees and 28 degrees.

[0097] The control unit can check whether a power-on signal has been received (S510). If the power-on signal has not been received, the control unit can perform a process of receiving external temperature and humidity.

[0098] The control unit can control the cooling fan to turn on when a power-on signal is received and the power is turned on (S520).

[0099] The control unit can control the cooling fan to operate at a fifth RPM by setting the duty ratio of the current supplied to the cooling fan to, for example, 15%. The control unit can operate the cooling fan for a fifth period of time, for example, 5 minutes.

[0100] The control unit can check whether a charging preparation signal has been received (S530).

[0101] When a charge preparation signal is received and the control unit is in a charge preparation state, the cooling fan can be maintained at 5 RPM and determine whether condensation occurs inside the charging device case based on humidity information (S540).

[0102] The control unit can control the cooling fan to maintain 5 RPM if the condition of condensation occurring inside the charging device case does not correspond to the condition (S550).

[0103] When a condition for condensation to occur inside the charging device case is met, the control unit can control the cooling fan to operate at a 6th RPM by setting the duty ratio of the current supplied to the cooling fan to, for example, 80%. The control unit can control the cooling fan to operate for a 5th period of time, for example, 5 minutes (S560).

[0104] The control unit can control the cooling fan to operate at 7 RPM by setting the duty ratio of the current supplied to the cooling fan to, for example, 15% when the humidity is low and condensation does not occur inside the case of the charging device.

[0105] The control unit can check whether a charging start signal is received (S570).

[0106] When a charging start signal is received and the charging state is established, the control unit can control the cooling fan to operate at 8 RPM by setting the duty ratio of the current supplied to the cooling fan to, for example, 70% (S590).

[0107] The control unit can check whether a charging end signal has been received (S600).

[0108] The control unit can maintain the cooling fan RPM if a charging end signal is not received (S610).

[0109] When a charging end signal is received and the charging end state is reached, the control unit can operate the cooling fan for a sixth time period, for example, 10 minutes, and then turn it off (S620).

[0110] As illustrated in Fig. 9, the control unit can receive external temperature and humidity from a temperature and humidity sensor (S700). Here, the external temperature may be 12 degrees or lower.

[0111] The control unit can check whether a power-on signal has been received (S710). If the power-on signal has not been received, the control unit can perform a process of receiving external temperature and humidity.

[0112] The control unit can control the cooling fan to turn on when a power-on signal is received and the power is turned on (S720).

[0113] The control unit can control the cooling fan to operate at the 9th RPM by setting the duty ratio of the current supplied to the cooling fan to, for example, 10%. The control unit can operate the cooling fan for the 7th time period, for example, 5 minutes.

[0114] The control unit can check whether a charging preparation signal has been received (S730).

[0115] The control unit can control the cooling fan to maintain the 9th RPM when a charging preparation signal is received and the charging preparation state is established (S740).

[0116] The control unit can check whether a charging start signal is received (S750).

[0117] When a charging start signal is received, the control unit can control the cooling fan to operate at 10 RPM by setting the duty ratio of the current supplied to the cooling fan to, for example, 80% before charging the electric vehicle (S770).

[0118] The control unit can control charging to start after a certain period of time, for example, 1 minute (S780).

[0119] When the control unit is in a charging state, the duty ratio of the current supplied to the cooling fan can be controlled to, for example, 60% so that the cooling fan operates at 11 RPM (S790).

[0120] The control unit can check whether a charging end signal has been received (S800).

[0121] The control unit can maintain the cooling fan RPM if a charging end signal is not received (S810).

[0122] When a charging end signal is received and the charging end state is reached, the control unit can operate the cooling fan for an 8th hour, for example, 10 minutes, and then turn it off (S820).

[0123] In the above, the control unit can continuously monitor the conditions under which condensation occurs within the case of the charging device using humidity information.

[0124] Although the above has been described with reference to drawings and embodiments, it will be understood by those skilled in the art that the embodiments can be variously modified and changed within a scope that does not depart from the technical idea of ​​the embodiments described in the following patent claims.

Claims

1. A case with vents formed to allow air to move; A cooling fan mounted on at least one side of the case to draw in and draw out air through the ventilation holes; A temperature and humidity sensor positioned adjacent to the ventilation hole on one side of the case to measure the external temperature and humidity; and An electric vehicle charging device comprising a control unit that receives the external temperature and humidity information, calculates conditions under which condensation occurs within the case based on the external temperature and humidity information, and controls the operation of the cooling fan based on the conditions.

2. In paragraph 1, Further comprising a storage unit in which wet air leadership information is stored, The above control unit, An electric vehicle charging device that compares the external temperature and humidity information with the hygroscopic air quality chart information to calculate conditions under which condensation occurs within the case.

3. In paragraph 1, Further comprising a communication unit for receiving charging status information including a power-on signal, a charging preparation signal, a charging start signal, and a charging end signal, The above control unit, An electric vehicle charging device that controls the operation of the cooling fan by setting the RPM differently based on the charging status information.

4. In paragraph 3, The above control unit, When the power-on signal is received while the external temperature has a temperature value between the first temperature and the second temperature, the cooling fan is controlled to operate at the first RPM. An electric vehicle charging device that determines whether the humidity corresponds to a condition for condensation to occur within the case when the charging preparation signal is received, and controls the cooling fan to operate at a second RPM greater than the first RPM when the humidity is equal to or greater than a first humidity corresponding to a condition for condensation to occur within the case.

5. In paragraph 3, The above control unit, An electric vehicle charging device that controls the cooling fan to operate at a first RPM when the humidity is lower than the first humidity.

6. In Article 5, The above control unit, An electric vehicle charging device that controls the cooling fan to operate at a third RPM lower than the second RPM when the charging start signal is received.

7. In paragraph 3, The above control unit, When the power-on signal is received while the external temperature is lower than the first temperature, the cooling fan is controlled to operate at a fourth RPM lower than the first RPM. An electric vehicle charging device that controls the cooling fan to operate at a second RPM greater than the fourth RPM when the charging preparation signal is received.

8. In paragraph 7, The above control unit, An electric vehicle charging device that controls the cooling fan to operate at a fifth RPM lower than the second RPM when the charging start signal is received.

9. In paragraph 1, The above cooling fan includes a first cooling fan for drawing in the air and a second cooling fan for drawing out the air, The above temperature and humidity sensor is an electric vehicle charging device installed adjacent to the first cooling fan.

10. Step of receiving external temperature and humidity information; A step of calculating conditions for condensation to occur within an electric vehicle charging device based on the external temperature and humidity information; and A step of controlling the operation of the cooling fan based on the above conditions; A method for charging an electric vehicle comprising:

11. In paragraph 10, The steps for calculating the above conditions are: An electric vehicle charging method that compares the external temperature and humidity information with the hygroscopic air quality chart information to determine conditions under which condensation occurs within the case.

12. In paragraph 10, Further comprising a step of receiving a power-on signal, a charging preparation signal, a charging start signal, and a charging end signal, The step of controlling the operation of the above cooling fan is: When the power-on signal is received while the external temperature has a temperature value between the first temperature and the second temperature, the cooling fan is controlled to operate at the first RPM. An electric vehicle charging method in which, when the charging preparation signal is received, the humidity is determined to correspond to a condition in which condensation occurs within the case, and, when the humidity is equal to or greater than a first humidity corresponding to a condition in which condensation occurs within the case, the cooling fan is controlled to operate at a second RPM greater than the first RPM.

13. In paragraph 12, The step of controlling the operation of the above cooling fan is: An electric vehicle charging method for controlling the cooling fan to operate at a first RPM when the humidity is less than the first humidity.

14. In paragraph 12, The step of controlling the operation of the above cooling fan is: When the power-on signal is received while the external temperature is lower than the first temperature, the cooling fan is controlled to operate at a fourth RPM lower than the first RPM. An electric vehicle charging method for controlling the cooling fan to operate at a second RPM greater than the fourth RPM when the charging preparation signal is received.

15. In paragraph 14, The step of controlling the operation of the above cooling fan is: An electric vehicle charging method for controlling the cooling fan to operate at a fifth RPM lower than the second RPM when the charging start signal is received.

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