Charging control device for electric vehicle and method thereof

Abstract

To provide a charge control device of an electric vehicle and a method for the same in which PLC communication (Power Line Communication) with a charger can be prevented from being interrupted in the process of charging a battery of the electric vehicle.SOLUTION: A charge control device 130 includes: a communication unit 20 which performs the PLC communication with the charger; and a controller 40 which requests the charger for a charging request current, detects a round trip time required until reception of a response for the request, and controls the charging request current based on the detected round trip time.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a technology for preventing a time-out of power line communication (PLC) with a charger during the process of charging a battery of an electric vehicle using the charger. [Background technology]

[0002] Generally, electric vehicles obtain energy for driving their electric motors from a battery (e.g., a high-voltage battery). Therefore, when the battery's SOC (State of Charge) drops below a reference value, it must be charged. There are two charging methods: a boost method, in which the battery is charged by boosting the charger's voltage (400V), and a non-boost method, in which the battery is charged using the charger's voltage (e.g., 800V) as is.

[0003] Since non-boosting methods generate noise due to the charger during the charging process, boosting methods are mainly used. Such boosting methods include boosting methods using a converter and boosting methods using a multi-inverter.

[0004] The converter-based boost method is a commonly used method, but has a drawback in that it requires an additional converter to be provided in the electric vehicle, which increases costs.

[0005] The multi-inverter boost method has the advantage of not requiring a separate converter to boost the charging voltage of the battery, but has the disadvantage of generating noise during the switching process for boosting the charging voltage.

[0006] Such noise can cause distortion in the PCL communication with the charger, which must be maintained during the process of charging the battery of an electric vehicle, and can cause the PCL communication with the charger to time out.

[0007] If the PCL communication with the charger is interrupted, the charging of the battery is also interrupted. Therefore, a method is required to prevent the interruption of the PCL communication with the charger during the charging process of the electric vehicle battery.

[0008] The matters described in this Background Art section are prepared to enhance understanding of the background of the invention, and may include matters that are not conventional art known to those having ordinary skill in the art to which this technology pertains. Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention provides a charging control device and method for an electric vehicle that, when connected to a charger via PLC (Power Line Communication), requests a charging current from the charger and detects the round trip time it takes to receive a corresponding response, and adjusts the switching period of a multi-inverter based on the round trip time, thereby preventing interruption of PLC communication with the charger during charging of the battery of the electric vehicle.

[0010] In addition, the present invention provides a charging control device and method for an electric vehicle, which can prevent interruption of PLC (Power Line Communication) communication with a charger during charging of the battery of the electric vehicle by requesting a required charging current from the charger while the charger is connected via PLC, detecting a round trip time required for receiving a corresponding response, and adjusting the required charging current based on the round trip time. [Means for solving the problem]

[0011] A charging control device for an electric vehicle according to one embodiment of the present invention may include a communication unit that performs power line communication (PLC) with a charger; a multi-inverter that boosts a charging voltage from the charger; and a control unit that requests a required charging current from the charger, detects a round-trip time required to receive a response corresponding to the request, and adjusts a switching period of the multi-inverter based on the detected round-trip time.

[0012] In an embodiment of the present invention, the control unit may adjust the switching period of the multi-inverter so that the detected round trip time does not exceed a reference round trip time.

[0013] In one embodiment of the present invention, the control unit can increase the switching period of the multi-inverter if the detected round-trip time does not exceed the reference round-trip time, and can decrease the switching period of the multi-inverter if the detected round-trip time exceeds the reference round-trip time.

[0014] In an embodiment of the present invention, the control unit may measure an initial round trip time a reference number of times and set the reference round trip time based on an average value of the initial round trip time measured the reference number of times.

[0015] In one embodiment of the present invention, the electric vehicle may charge the high-voltage battery with charging power corresponding to a first charging voltage supplied from the charger.

[0016] In one embodiment of the present invention, when the electric vehicle receives a second charging voltage lower than the first charging voltage from the charger, the electric vehicle can boost the second charging voltage to the first charging voltage and charge the high-voltage battery with charging power corresponding to the first charging voltage.

[0017] A charging control device for an electric vehicle according to another embodiment of the present invention may include a communication unit that performs power line communication (PLC) with a charger; and a control unit that requests a charging request current from the charger, detects a round-trip time required to receive a response corresponding to the request, and adjusts the charging request current based on the detected round-trip time.

[0018] A charging control method for an electric vehicle according to one embodiment of the present invention may include a step of: a communication unit connecting a charger to a PLC (Power Line Communication); a multi-inverter boosting a charging voltage from the charger; a control unit requesting a required charging current from the charger and detecting a round-trip time required until receiving a response corresponding to the request; and a step of the control unit adjusting a switching period of the multi-inverter based on the detected round-trip time.

[0019] One embodiment of the present invention may include a step of determining whether the detected round-trip time exceeds a reference round-trip time; a step of increasing a switching period of the multi-inverter if the detected round-trip time does not exceed the reference round-trip time as a result of the determination; and a step of decreasing a switching period of the multi-inverter if the detected round-trip time exceeds the reference round-trip time as a result of the determination.

[0020] An embodiment of the present invention may further include measuring an initial round trip time a reference number of times; and setting the reference round trip time based on an average value of the initial round trip times measured the reference number of times.

[0021] An embodiment of the present invention may further include the steps of: charging a high-voltage battery of the electric vehicle with charging power corresponding to a first charging voltage supplied from the charger; if the electric vehicle receives a second charging voltage lower than the first charging voltage from the charger, boosting the second charging voltage to the first charging voltage; and charging the high-voltage battery of the electric vehicle with charging power corresponding to the boosted first charging voltage.

[0022] A charging control method for an electric vehicle according to another embodiment of the present invention may include a step of: a communication unit connecting a charger to a PLC (Power Line Communication); a control unit requesting a required charging current from the charger and detecting a round-trip time required until a response corresponding to the request is received; and a step of the control unit adjusting the required charging current based on the detected round-trip time. [Effects of the Invention]

[0023] According to an embodiment of the present invention, a charging control device and method for an electric vehicle, when connected to a charger via Power Line Communication (PLC), requests a charging current from the charger, detects a round trip time required to receive a corresponding response, and adjusts a switching period of a multi-inverter based on the round trip time, thereby preventing interruption of PLC communication with the charger during the process of charging the battery of the electric vehicle.

[0024] According to an embodiment of the present invention, a charging control device and method for an electric vehicle requests a required charging current from a charger when connected to the charger via Power Line Communication (PLC), detects a round trip time required to receive a corresponding response, and adjusts the required charging current based on the round trip time, thereby preventing interruption of PLC communication with the charger during charging of the battery of the electric vehicle. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a diagram illustrating an example of a charging system for an electric vehicle to which each embodiment of the present invention is applied; [Figure 2a] 1 is an exemplary diagram showing a first round trip time measured in a charging system for an electric vehicle to which an embodiment of the present invention is applied; [Figure 2b]1 is a diagram illustrating an example of a round trip time measured in a charging system for an electric vehicle to which an embodiment of the present invention is applied. [Figure 2c] 10 is another exemplary diagram showing a round trip time measured in a charging system for an electric vehicle to which an embodiment of the present invention is applied. [Figure 2d] 10 is yet another exemplary diagram showing a round trip time measured in a charging system for an electric vehicle to which an embodiment of the present invention is applied. [Figure 3] 1 is a diagram showing the configuration of a charging control device for an electric vehicle according to an embodiment of the present invention; [Figure 4] 2 is a flowchart illustrating a method for controlling charging of an electric vehicle according to an embodiment of the present invention. [Figure 5] 10 is a flowchart illustrating a method for controlling charging of an electric vehicle according to another embodiment of the present invention. [Figure 6] 1 is a block diagram showing a computer system for carrying out a charging control method for an electric vehicle according to each embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0026] Some embodiments of the present invention will be described in detail below with reference to exemplary drawings. When assigning reference numerals to components in each drawing, it should be noted that the same reference numerals are used to designate the same components even if they appear in different drawings. Furthermore, when describing the embodiments of the present invention, if a detailed description of related known structures or functions is deemed to hinder understanding of the embodiments of the present invention, such detailed description will be omitted.

[0027] When describing components of embodiments of the present invention, terms such as "first," "second," "A," "B," "(a)," and "(b)" may be used. These terms are merely used to distinguish the component from other components and do not limit the essence, procedure, or order of the components. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly defined in this application.

[0028] FIG. 1 is a diagram illustrating an example of a charging system for an electric vehicle to which each embodiment of the present invention is applied.

[0029] As shown in FIG. 1, an electric vehicle charging system 100 to which each embodiment of the present invention is applied may include a charger 110 and a charging control device 130 provided in an electric vehicle 120 .

[0030] The electric vehicle 120 includes a high-voltage battery (not shown) that is charged by the charger 110, and may include a plug-in hybrid electric vehicle (PHEV) as well as a pure electric vehicle.

[0031] At least one of a boost method using a multi-inverter 122 and a boost method using a converter may be applied to the electric vehicle 120. For example, the electric vehicle 120 may charge the high-voltage battery with charging power corresponding to 800V supplied from the charger 110, or may boost 400V supplied from the charger 110 to 800V and charge the high-voltage battery with charging power corresponding to 800V. In this case, the electric vehicle 120 may boost 400V supplied from the charger 110 to 800V using the multi-inverter 122 having a boost function.

[0032] For reference, the boost method using the multi-inverter 122 is a well-known and commonly used technology based on an inverter that converts a direct current into a three-phase alternating current through a switching operation, and a motor that generates rotational force using the three-phase alternating current input from the inverter. When a charging current from the charger 110 is applied to the neutral point (N) of the motor, the voltage of the neutral point (N) of the motor can be boosted by the duty of the switching element in the inverter.

[0033] The charger 110 provided at the charging station is a high-power charger and may have a DC combo type outlet 111, and correspondingly, the electric vehicle 120 may have a DC combo type inlet 121.

[0034] In addition, when the outlet 111 of the charger 110 is connected to the inlet 121 of the electric vehicle 120, PLC becomes possible, and a charging sequence can be performed between the charger 110 and the electric vehicle 120 through such PLC. Here, the charging sequence may use any method.

[0035] The charger 110 may return a response corresponding to the request for the charging current to the charging control device 130 and supply the charging current to the electric vehicle 120 .

[0036] The charging control device 130 is a core component of the present invention, and when connected to the charger 110 via PLC, it requests a charging current from the charger 110, detects the round trip time it takes to receive a corresponding response, and adjusts the switching period of the multi-inverter 122 based on the round trip time, thereby preventing interruption of PCL communication between the charging control device 130 and the charger 110 during the process of charging the battery of the electric vehicle 120.

[0037] In addition, when the charging control device 130 is connected to the charger 110 via PLC, the charging control device 130 requests a charging current from the charger 110, detects the round trip time it takes to receive a corresponding response, and adjusts the charging current based on the round trip time, thereby preventing interruption of PCL communication between the charging control device 130 and the charger 110 during the process of charging the battery of the electric vehicle 120.

[0038] The round trip time will be discussed below with reference to Figures 2a to 2d.

[0039] FIG. 2a is an exemplary diagram showing the first round trip time measured in an electric vehicle charging system to which an embodiment of the present invention is applied.

[0040] As shown in FIG. 2a, the time when the charging control device 130 requests the initial charging current (for example, 1 A) from the charger 110 is 37.247 seconds (211), and the time when the charging control device 130 receives a response corresponding to the request from the charger 110 is 37.297 seconds (212), so the initial round trip time is 0.05 seconds.

[0041] Such an initial round trip time means that PCL communication is smooth, and therefore, interruption of PCL communication due to noise does not occur during the process of charging the battery of the electric vehicle 120.

[0042] FIG. 2b is an exemplary diagram showing round trip times measured in a charging system for an electric vehicle to which an embodiment of the present invention is applied, showing round trip times occurring after the initial round trip time.

[0043] As shown in FIG. 2b, the time when the charging control device 130 requests the charger 110 for a required charging current (for example, 31.7A) is 40.448 seconds (221), and the time when the charging control device 130 receives a response corresponding to the request from the charger 110 is 40.547 seconds (222), so the round trip time is 0.099 seconds.

[0044] As a result, when the required charging current increases, the round trip time increases due to noise generated in the process of boosting the charging voltage from the 400V charger or noise generated by the 800V charger. However, until this point, the noise does not cause an interruption in PCL communication.

[0045] FIG. 2c is another exemplary diagram showing a round trip time measured in an electric vehicle charging system to which an embodiment of the present invention is applied, showing a round trip time occurring after the round trip time of FIG. 2b.

[0046] As shown in FIG. 2c, the time when the charging control device 130 requests the charger 110 for a required charging current (for example, 36.7A) is 40.987 seconds (231), and the time when the charging control device 130 receives a response corresponding to the request from the charger 110 is 41.157 seconds (232), so the round trip time is 0.17 seconds.

[0047] As a result, when the required charging current increases, the round trip time increases due to noise generated in the process of boosting the charging voltage from the 400V charger or noise generated by the 800V charger. However, until this point, the noise does not cause an interruption in PCL communication.

[0048] FIG. 2d is yet another example diagram showing a round trip time measured in an electric vehicle charging system to which an embodiment of the present invention is applied, showing a round trip time occurring after the round trip time of FIG. 2c.

[0049] 2d, at 41.888 seconds (241), the charging control device 130 requests a charging current (e.g., 45.7 A) from the charger 110. However, the charging control device 130 does not receive a response corresponding to the request from the charger 110 within the reference round trip time (e.g., 250 ms).

[0050] Therefore, the charge control device 130 again requests the charger 110 for the required charging current (for example, 45.7 A) at 42.140 seconds (242).

[0051] Nevertheless, the charging control device 130 does not receive a response corresponding to the re-request within a reference round trip time (for example, 250 ms), and performs a charging termination sequence (243).

[0052] Through this, it can be seen that if a response to the first request is not received within the standard round trip time, a second request is made, and if a response to the second request is not received within the standard round trip time, a charging termination sequence is performed.

[0053] In addition, if the charging request current increases excessively, noise generated in the process of boosting the charging voltage from the 400V charger or noise generated by the 800V charger can cause the round trip time to exceed the reference round trip time, resulting in the interruption of PCL with the charger 110.

[0054] Ultimately, it can be seen that the higher the charging current requirement, the greater the impact of noise on the PLC.

[0055] Taking into consideration the characteristics of the round trip time depending on the required charging current, the charging control device 130 can adjust the required charging current.

[0056] Meanwhile, in order to control noise generated in the process of boosting the charging voltage from the 400V charger, the charging current requirement can be adjusted using the indirect method described above, but the switching period of the multi-inverter 122, which performs the function of boosting the charging voltage, can also be adjusted using the direct method.

[0057] FIG. 3 is a diagram showing the configuration of a charging control device for an electric vehicle according to one embodiment of the present invention.

[0058] 3, the charging control device 130 for an electric vehicle according to an embodiment of the present invention may include a storage unit 10, a communication unit 20, a display unit 30, and a control unit 40. In this case, depending on the manner in which the charging control device 130 for an electric vehicle according to an embodiment of the present invention is implemented, the respective components may be combined with each other to be embodied as one, or some components may be omitted.

[0059] The storage unit 10 may store various logics, algorithms, and programs required in the process of requesting a required charging current from the charger 110 when the storage unit 10 is connected to the charger 110 via PLC, detecting the round-trip time required to receive a corresponding response, and adjusting the required charging current based on the round-trip time.

[0060] The storage unit 10 may store a reference round trip time (for example, 250 ms) used to adjust the charging current required for the charger 110. The reference round trip time may be arbitrarily changed according to the designer's intention.

[0061] The storage unit 10 may include at least one type of storage medium selected from memories such as flash memory type, hard disk type, micro type, and card type (e.g., Secure Digital Card (SD card) or eXtream Digital Card (XD card)), and Random Access Memory (RAM), Static RAM (SRAM), Read-Only Memory (ROM), Programmable ROM (PROM), Electrically Erasable PROM (EEPROM), Magnetic RAM (MRAM), magnetic disk, and optical disk.

[0062] The communication unit 20 is a module that communicates with the charger 110 using a PLC method, and can perform a charging sequence with the charger 110 under the control of the control unit 40. In particular, the communication unit 20 can transmit a message (Current Demand Request) requesting a charging current to the charger 110, and can receive a response message (Current Demand Response) corresponding to the request message from the charger 110.

[0063] The display unit 30 can display the progress of the charging sequence, and in particular, the charging current currently being supplied to the battery.

[0064] The control unit 40 may perform overall control so that each of the components can normally perform its intended function. The control unit 40 may be implemented in the form of hardware, software, or a combination of hardware and software. Preferably, the control unit 40 may be implemented as a microprocessor, but is not limited thereto.

[0065] In particular, when the control unit 40 is connected to the charger 110 via PLC, it requests a charging current from the charger 110, detects the round-trip time it takes to receive a corresponding response, and adjusts the charging current based on the round-trip time or performs various controls in the process of adjusting the switching period of the multi-inverter 122.

[0066] The control unit 40 can control the communication unit 20 to transmit a message (Current Demand Request) requesting a charging current to the charger 110 and receive a response message (Current Demand Response) corresponding to the request message from the charger 110.

[0067] The control unit 40 can transmit a message (Current Demand Request) requesting a charging current to the charger 110 and measure the round-trip time required to receive a response message (Current Demand Response) corresponding to the request message from the charger 110.

[0068] The control unit 40 can set a reference round-trip time based on the measured round-trip time. For example, the control unit 40 can set the reference round-trip time to two or three times the measured round-trip time.

[0069] The control unit 40 may calculate an average value of round trip times measured initially n times (for example, five times) and set a reference round trip time based on the calculated average value. For example, the control unit 40 may set the reference round trip time to two or three times the calculated average value.

[0070] The control unit 40 can increase the required charging current as long as the PLC is operating normally without interruption. At this time, the control unit 40 can increase the required charging current taking into account the battery state (e.g., performance, deterioration level, SOH (Battery State Health), etc.).

[0071] The control unit 40 adjusts the switching period of the multi-inverter 122 while maintaining the requested charging current from the charger 110, thereby preventing PLC communication from being interrupted by noise generated during the process of supplying the requested charging current.

[0072] The detailed operation of the control unit 40 will be discussed below with reference to FIGS.

[0073] FIG. 4 is a flowchart illustrating a method for controlling charging of an electric vehicle according to an embodiment of the present invention.

[0074] First, when the outlet 111 of the charger 110 and the inlet 121 of the electric vehicle 120 are connected, the control unit 40 can proceed with the charging sequence, and in particular, can request a required charging current from the charger 110 via PLC (power line communication) (401). At this time, the initial required charging current is 1 A, and thereafter, the required charging current can be gradually increased.

[0075] Thereafter, the control unit 40 may receive a response corresponding to the request for the required charging current from the charger 110 (402). Then, the control unit 40 may request the required charging current from the charger 110 and detect the round-trip time required until the corresponding response is received (403).

[0076] Thereafter, the control unit 40 can check whether a reference round trip time has been set (404).

[0077] If the reference round trip time is not set as a result of the check (404), the control unit 40 can check whether the measured round trip time is the round trip time measured for the nth time (405).

[0078] As a result of the check (405), if the measured round trip time is not the round trip time measured for the nth time, the control unit 40 proceeds to step '401'.

[0079] As a result of the check (405), if the measured round trip time is the round trip time measured for the nth time, the control unit 40 can calculate the average value of the n round trip times (406).

[0080] Thereafter, the control unit 40 can set the reference round trip time based on the calculated average value (407). At this time, since the round trip time measured the initial n times is a value measured when the PLC is operating normally, the reference round trip time may be set based on the round trip time measured the initial n times.

[0081] As a result of the check (404), if a reference round trip time is set, the control unit 40 can check whether the measured round trip time exceeds the reference round trip time (408).

[0082] If the measured round trip time does not exceed the reference round trip time as a result of the check (408), the control unit 40 can increase the switching period of the multi-inverter 122 (409). In this case, the control unit 40 can also maintain the switching period of the multi-inverter 122. Here, increasing the switching period of the multi-inverter 122 means that the switching period becomes shorter.

[0083] If the measured round trip time exceeds the reference round trip time as a result of the check (408), the control unit 40 can reduce the switching period of the multi-inverter 122 (410). That is, the switching period of the multi-inverter 122 can be set longer to reduce the number of switching times per reference time.

[0084] As a result, the control unit 40 can increase the switching period of the multi-inverter 122 until the measured round trip time does not exceed the reference round trip time.

[0085] FIG. 5 is a flowchart of a method for controlling charging of an electric vehicle according to another embodiment of the present invention.

[0086] First, when the outlet 111 of the charger 110 and the inlet 121 of the electric vehicle 120 are connected, the control unit 40 can proceed with the charging sequence, and in particular, can request a required charging current from the charger 110 via PLC (power line communication) (501). At this time, the initial required charging current is 1 A, and thereafter, the required charging current can be gradually increased.

[0087] Thereafter, the control unit 40 may receive a response corresponding to the request for the required charging current from the charger 110 (502). Then, the control unit 40 may request the required charging current from the charger 110 and detect the round-trip time required until the corresponding response is received (503).

[0088] Thereafter, the control unit 40 can check whether a reference round trip time has been set (504).

[0089] If the reference round trip time is not set as a result of the check (504), the control unit 40 can check whether the measured round trip time is the round trip time measured for the nth time (505).

[0090] As a result of the check (505), if the measured round trip time is not the round trip time measured for the nth time, the control unit 40 proceeds to step '501'.

[0091] As a result of the check (505), if the measured round trip time is the round trip time measured for the nth time, the control unit 40 can calculate the average value of the n round trip times (506).

[0092] Thereafter, the control unit 40 can set the reference round trip time based on the calculated average value (507). At this time, since the round trip time measured the initial n times is a value measured when the PLC is operating normally, the reference round trip time may be set based on the round trip time measured the initial n times.

[0093] As a result of the check (504), if a reference round trip time is set, the control unit 40 can check whether the measured round trip time exceeds the reference round trip time (508).

[0094] As a result of the check (508), if the measured round trip time does not exceed the reference round trip time, the control unit 40 can increase the charging request current (509).

[0095] If the measured round trip time exceeds the reference round trip time as a result of the check (508), the control unit 40 may request the charger 110 to maintain the previous required charging current (510). That is, the previous required charging current may be maintained.

[0096] As a result, the control unit 40 can increase the charging current request until the measured round trip time does not exceed the reference round trip time.

[0097] FIG. 6 is a block diagram showing a computer system for carrying out the charging control method for an electric vehicle according to each embodiment of the present invention.

[0098] 6, the charging control method for an electric vehicle according to each embodiment of the present invention may be implemented using a computer system 1000. The computer system 1000 may include at least one processor 1100, a memory 1300, a user interface input device 1400, a user interface output device 1500, a storage 1600, and a network interface 1700, all of which are connected via a system bus 1200.

[0099] The processor 1100 may be a central processing unit (CPU) or a semiconductor device that performs processing on instructions stored in the memory 1300 and / or the storage 1600. The memory 1300 and the storage 1600 may include various types of volatile or non-volatile storage media. For example, the memory 1300 may include a read only memory (ROM) 1310 and a random access memory (RAM) 1320.

[0100] Thus, the steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware executed by processor 1100, in a software module, or a combination of the two. The software module may reside in a storage medium (i.e., memory 1300 and / or storage 1600) such as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a solid-state drive (SSD), a removable disk, or a CD-ROM. An exemplary storage medium is coupled to processor 1100 such that processor 1100 can read information from and write information to the storage medium. Alternatively, the storage medium may be integral to processor 1100. The processor and the storage medium may reside in an application specific integrated circuit (ASIC). The ASIC may reside in a user terminal. Alternatively, the processor and the storage medium may reside as discrete components in a user terminal.

[0101] The above description is merely an illustrative example of the technical concept of the present invention, and various modifications and variations may be made by a person having ordinary knowledge in the technical field to which the present invention pertains without departing from the essential characteristics of the present invention.

[0102] Therefore, the embodiments disclosed in the present invention are for the purpose of illustrating, not limiting, the technical idea of ​​the present invention, and the scope of the technical idea of ​​the present invention is not limited by such embodiments. The scope of protection of the present invention should be interpreted by the claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention. [Explanation of symbols]

[0103] 10 Storage area 20 Communications Department 30 Display section 40 Control Unit

Claims

1. a communication unit that performs PLC (Power Line Communication) with the charger; A multi-inverter that boosts the charging voltage from the charger; and a control unit that requests a required charging current from the charger, detects a round-trip time required until a response corresponding to the request is received, and adjusts a switching period of the multi-inverter based on the detected round-trip time; Including, The control unit reduces a switching cycle of the multi-inverter if the detected round trip time exceeds a reference round trip time.

2. The control unit The charging control device for an electric vehicle according to claim 1, wherein the switching period of the multi-inverter is adjusted so that the detected round trip time does not exceed a reference round trip time.

3. The control unit 3. The charging control device for an electric vehicle according to claim 2, wherein the switching period of the multi-inverter is increased if the detected round-trip time does not exceed the reference round-trip time, and the switching period of the multi-inverter is decreased if the detected round-trip time exceeds the reference round-trip time.

4. The control unit 3. The charge control device for an electric vehicle according to claim 2, wherein the initial round trip time is measured a reference number of times, and the reference round trip time is set based on an average value of the initial round trip time measured the reference number of times.

5. Further including a high voltage battery, The electric vehicle includes: charging the high voltage battery with charging power corresponding to the first charging voltage supplied from the charger; 2. The charging control device for an electric vehicle according to claim 1, wherein, when a second charging voltage lower than the first charging voltage is supplied from the charger, the second charging voltage is boosted to the first charging voltage, and the high-voltage battery is charged with charging power corresponding to the first charging voltage.

6. A communication unit that performs power line communication (PLC) with the charger; and a control unit that requests a required charging current from the charger, detects a round-trip time required until a response corresponding to the request is received, and adjusts the required charging current based on the detected round-trip time; Including, The control unit reduces a charging current request when the detected round trip time exceeds a reference round trip time.

7. a step of connecting the communication unit with the charger via PLC (Power Line Communication); a step in which a multi-inverter boosts a charging voltage from the charger; a control unit requesting a charging current from the charger and detecting a round-trip time required until a response corresponding to the request is received; and the control unit adjusting a switching period of the multi-inverter based on the detected round trip time; Including, In the step of adjusting the switching period of the multi-inverter, the switching period of the multi-inverter is reduced if the detected round trip time exceeds a reference round trip time.

8. The step of adjusting the switching period of the multi-inverter includes: determining whether the detected round trip time exceeds a reference round trip time; increasing a switching period of the multi-inverter if the detected round-trip time does not exceed a reference round-trip time as a result of the determination; and reducing a switching period of the multi-inverter if the detected round-trip time exceeds a reference round-trip time as a result of the determination; The method of controlling charging of an electric vehicle according to claim 7, comprising:

9. The step of adjusting the switching period of the multi-inverter includes: measuring the initial round trip time a reference number of times; and setting the reference round trip time based on an average value of the initial round trip times measured the reference number of times; The method of controlling charging of an electric vehicle according to claim 8, further comprising:

10. charging a high-voltage battery of the electric vehicle with charging power corresponding to the first charging voltage supplied from the charger; When the electric vehicle receives a second charging voltage lower than the first charging voltage from a charger, boosting the second charging voltage to the first charging voltage; and charging the high-voltage battery of the electric vehicle with charging power corresponding to the boosted first charging voltage; The method of controlling charging of an electric vehicle according to claim 7, further comprising:

11. a step of connecting the communication unit with the charger via PLC (Power Line Communication); a control unit requesting a charging current from the charger and detecting a round-trip time required until a response corresponding to the request is received; and adjusting the required charging current based on the detected round trip time by the control unit; Including, In the step of adjusting the required charging current, the required charging current is reduced if the detected round trip time exceeds a reference round trip time.

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