Charging and discharging v2l module for electric vehicle

Abstract

An embodiment of the present invention provides a charging and discharging V2L module for an electric vehicle, which is connected to each of an inlet of the electric vehicle and an external load to supply power of the electric vehicle to the external load, or is connected to each of the inlet of the electric vehicle and an external power source to charge the electric vehicle with power of the external power source. The charging and discharging V2L module includes: a first circuit line unit connected to a CP line of the electric vehicle to apply a CP signal from the external power source to the electric vehicle; a second circuit line unit connected to a PD line of the electric vehicle to detect whether the charging and discharging V2L module and the inlet of the electric vehicle are accurately fastened; a third circuit line unit connected to a power line of the electric vehicle to allow power to flow from the electric vehicle to the external load or from the external power source to the electric vehicle; a first relay for switching an electrical connection of the first circuit line unit and an electrical connection of the second circuit line unit depending on whether the external power source is connected; a second relay for switching an electrical connection of the third circuit line unit depending on whether the external power source is connected; and a controller activated when the external power source is connected, so as to electrically control an operation of the second relay.

Description

V2L charging / discharging module for electric vehicles

[0001] The present invention relates to a charging / discharging V2L module for an electric vehicle.

[0002] Electric vehicles (EVs) are powered by electricity from an external power source. These vehicles are connected to power lines, Control Pilot (CP) lines, and Proximity Detection (PD) lines to charge from external sources, such as EVSE (Electric Vehicle Supply Equipment).

[0003] Meanwhile, with the introduction of bidirectional OBCs in electric vehicles, high-capacity discharge (consumption) became possible, replacing the previous ability to only charge with high-voltage batteries, leading to the emergence of V2L (Vehicle to Load) technology. V2L technology refers to the concept of electric vehicles supplying power to external electronic devices, allowing the convenient use of various electronic devices by utilizing the batteries built into the electric vehicle. This V2L technology is achieved through V2L modules that are respectively connected to the vehicle inlet and external electronic devices. By utilizing these V2L modules, various heating appliances, cooking utensils, lighting fixtures, etc. that could not be used outdoors due to the need for a power supply can be used anywhere.

[0004] However, the conventional V2L module could only supply one-way power to external electronic devices, which was inconvenient as it required a separate charging module to charge electric vehicles.

[0005] Prior art literature

[0006] (Patent Document 1) Korean Patent Publication No. 10-2021-0018695 (February 18, 2021)

[0007] The present invention is intended to solve the problems of the prior art described above, and an object of the present invention is to provide a V2L charging / discharging module for an electric vehicle that operates as an electric vehicle charger when an external power source is connected.

[0008] In order to achieve the above object, one aspect of the present invention is a charge / discharge V2L module for an electric vehicle, which is connected to an inlet of an electric vehicle and an external load, respectively, to supply power of the electric vehicle to the external load, or is connected to an inlet of an electric vehicle and an external power source, respectively, to charge power of an external power source to the electric vehicle, the V2L module comprising: a first circuit line part connected to a CP line of the electric vehicle to apply a CP signal from an external power source to the electric vehicle; a second circuit line part connected to a PD line of the electric vehicle to detect whether the inlet of the charge / discharge V2L module and the electric vehicle are correctly connected; a third circuit line part connected to a power line of the electric vehicle to flow power from the electric vehicle to the external load or from the external power source to the electric vehicle; a first relay that switches the electrical connection of the first circuit line part and the electrical connection of the second circuit line part depending on whether an external power source is connected; a second relay that switches the electrical connection of the third circuit line part depending on whether an external power source is connected; and a second relay that is activated when an external power source is connected and electrically controls the operation of the second relay. A V2L charging / discharging module for an electric vehicle, including a controller, is provided.

[0009] In one embodiment of the present invention, the first relay is a DPDT relay that connects between the CP line of the electric vehicle and the first circuit line section and between the PD line of the electric vehicle and the second circuit line section, and the second relay is a DPDT relay that connects between a power line including the L1 line and the L2 / N line of the electric vehicle and the third circuit line section, which may be a charge / discharge V2L module for an electric vehicle.

[0010] In one embodiment of the present invention, the charging / discharging V2L module for an electric vehicle may be characterized in that, in a discharge mode in which the external load is connected to the charging / discharging V2L module, the first relay and the second relay are connected to NC (Nomally Close) contacts, and in a charging mode in which the external power source is connected to the charging / discharging V2L module, the first relay and the second relay are connected to NO (Nomally Open) contacts.

[0011] In one embodiment of the present invention, the first circuit line section may include a first line connected to the NC contact of the first relay connected to the CP line and a second line connected to the NO contact of the first relay, wherein the first line is provided with a first switch, and the second line is connected to the controller, and may be a charging / discharging V2L module for an electric vehicle.

[0012] In one embodiment of the present invention, the second circuit line section may be a charge / discharge V2L module for an electric vehicle, characterized in that it includes a third line connected to the NC contact of the first relay connected to the PD line and equipped with a first resistor, a fourth line connected to the NO contact of the first relay connected to the PD line and equipped with a second resistor, and a second switch connected to each of the third line and the fourth line, wherein the second switch is a DPDP switch.

[0013] In one embodiment of the present invention, the second circuit line section may be a V2L module for charging and discharging an electric vehicle, characterized in that it includes a fifth line connected to the NO contact of the second switch connected to the third line, a sixth line connected to the NC contact of the second switch connected to the third line, a seventh line connected to the NO contact of the second switch connected to the fourth line, and an eighth line connected to the NC contact of the second switch connected to the fourth line, wherein a third resistor is provided in the fifth line, and a fourth resistor is provided in the seventh line.

[0014] In one embodiment of the present invention, the third circuit line section may include a ninth line connected to the NO contact of the second relay connected to the L1 line, a tenth line connected to the NC contact of the second relay connected to the L1 line, an eleventh line connected to the NO contact of the second relay connected to the L2 / N line, and a twelfth line connected to the NC contact of the second relay connected to the L2 / N line, and the ninth line and the eleventh line are provided with inlets to which external power is connected, and the tenth line and the twelfth line are provided with outlets to which external loads are connected, which may be a charging / discharging V2L module for an electric vehicle.

[0015] In one embodiment of the present invention, the charging / discharging V2L module for an electric vehicle may be characterized in that when the external load is connected to the outlet, the discharge standby mode is switched, and then, when the first switch is closed, a discharge mode for supplying power from the electric vehicle to the external load is performed.

[0016] In one embodiment of the present invention, the charging / discharging V2L module for an electric vehicle may be characterized in that when the external power source is connected to the inlet, the controller is activated, and the controller controls the first relay and the second relay to switch the NC contacts of the first relay and the second relay to NO contacts, thereby performing a charging mode for charging power to the electric vehicle.

[0017] In one embodiment of the present invention, the charging / discharging V2L module for an electric vehicle may be characterized in that when the second switch is operated during the discharge mode and the NC contact of the second switch is switched to the NO contact, the discharge mode is put into a pause state.

[0018] In one embodiment of the present invention, the charging / discharging V2L module for an electric vehicle may be characterized in that when the second switch is operated during the charging mode and the NC contact of the second switch is switched to the NO contact, the charging mode is put into a pause state.

[0019] According to one aspect of the present invention, the electric vehicle charging / discharging V2L module of the present invention can perform a discharge mode or a charge mode with a single product depending on whether an external load or an external power source is connected, thereby providing consumer convenience.

[0020] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the composition of the invention described in the claims.

[0021] Figures 1 (a) and 1 (b) are overall conceptual diagrams showing the discharging and charging of an electric vehicle using a V2L charging / discharging module for an electric vehicle according to one embodiment of the present invention, respectively.

[0022] FIG. 2 is a conceptual diagram briefly showing the circuit configuration of a V2L charging / discharging module for an electric vehicle according to one embodiment of the present invention.

[0023] FIG. 3 is a conceptual diagram briefly showing the appearance of a V2L charging / discharging module for an electric vehicle according to one embodiment of the present invention.

[0024] FIG. 4 is a diagram showing a circuit configuration of a V2L charging / discharging module for an electric vehicle according to one embodiment of the present invention.

[0025] FIG. 5 is a circuit diagram showing an operational standby state of a charge / discharge V2L module for an electric vehicle in a discharge mode according to one embodiment of the present invention.

[0026] FIG. 6 is a circuit diagram showing the operating state of a charge / discharge V2L module for an electric vehicle in discharge mode according to one embodiment of the present invention.

[0027] FIG. 7 is a circuit diagram showing a pause state of a charge / discharge V2L module for an electric vehicle in discharge mode according to one embodiment of the present invention.

[0028] FIG. 8 is a circuit diagram showing the operating state of a V2L charging / discharging module for an electric vehicle in a charging mode according to one embodiment of the present invention.

[0029] FIG. 9 is a circuit diagram showing a pause state of a V2L module for charging and discharging electric vehicles in a charging mode according to one embodiment of the present invention.

[0030] Hereinafter, the present invention will be described with reference to the attached drawings. However, the present invention can be implemented in various different forms and is therefore not limited to the embodiments described herein. In the drawings, irrelevant parts have been omitted for clarity of description, and similar parts have been designated with similar reference numerals throughout the specification.

[0031] Throughout the specification, when a part is said to be "connected" to another part, this includes not only "directly connected" but also "indirectly connected" with other elements intervening. Furthermore, when a part is said to "include" a component, this does not exclude other components, but rather implies that the other components may be included, unless otherwise specifically stated.

[0032] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0033] FIG. 1 (a) and (b) are overall conceptual diagrams showing the discharging and charging of an electric vehicle using a V2L charging / discharging module for an electric vehicle according to an embodiment of the present invention, respectively, FIG. 2 is a conceptual diagram briefly showing the circuit configuration of a V2L charging / discharging module for an electric vehicle according to an embodiment of the present invention, FIG. 3 is a conceptual diagram briefly showing the appearance of a V2L charging / discharging module for an electric vehicle according to an embodiment of the present invention, and FIG. 4 is a diagram showing the circuit configuration of a V2L charging / discharging module for an electric vehicle according to an embodiment of the present invention.

[0034] Referring to FIG. 1, the V2L charging / discharging module (100) for an electric vehicle of the present invention is connected to the inlet of the electric vehicle (10) and an external load (20), respectively, to perform a V2L function (discharge mode) of supplying power of the electric vehicle to the external load, or is connected to the inlet of the electric vehicle (10) and an external power source (30), respectively, to perform a charging function (charge mode) of charging power of the external power source to the electric vehicle.

[0035] An electric vehicle (10) may include a bidirectional OBC, a high-voltage battery, a charge / discharge control system, an inlet, etc. The bidirectional OBC may supply power from an external power source (30) to the electric vehicle (10) or supply power stored in the electric vehicle to an external load (20). The high-voltage battery may store electric energy supplied from an external power source. The charge / discharge control system is a controller that oversees charging and discharging of the electric vehicle (10). The charge / discharge control system may include a CP (Control Pilot) line that exchanges information with the external power source (30) and a PD (Proximity Detection) line that detects whether the charge / discharge V2L module (100) for the electric vehicle and the inlet of the electric vehicle (10) are correctly connected. At this time, the CP signal is a signal that exchanges information between the external power source (30) and the electric vehicle (10). The PD signal is a signal for the function of detecting whether the charge / discharge V2L module (100) for the electric vehicle for charging or discharging and the inlet of the electric vehicle (10) are correctly connected. An electric vehicle charging / discharging V2L module (100) for supplying power from an external power source (20) to an electric vehicle (10) or for supplying power from an electric vehicle (10) to an external load (30) can be connected to the inlet.

[0036] Meanwhile, a vehicle connection part consisting of 5 or 7 pins, such as an inlet of an electric vehicle (10), may be formed on one side of the charging / discharging V2L module (100) for an electric vehicle, and an outlet to which an external load (20) is connected and a charging socket to which an external power source (30) is connected may be formed on the other side. Power lines L1, L2 / N, PE, a PD line for detecting whether the module is connected, and a CP line for exchanging information with an external power source may be connected between the charging / discharging V2L module (100) for an electric vehicle and the charging / discharging control system of the electric vehicle (10).

[0037] Referring to FIGS. 2 to 4, a V2L charging / discharging module (100) for an electric vehicle is a V2L charging / discharging module for an electric vehicle that is connected to an inlet of an electric vehicle (10) and an external load (20) respectively to supply power of the electric vehicle (10) to the external load, or is connected to an inlet of an electric vehicle (10) and an external power source (30) respectively to charge power of the external power source (30) to the electric vehicle (10), and may include a first circuit line section (110), a second circuit line section (120), a third circuit line section (130), a first relay (140), a second relay (150), and a controller (160).

[0038] More specifically, the charging / discharging V2L module (100) for an electric vehicle includes a first circuit line section (110) connected to the CP line of the electric vehicle (10) to apply a CP signal from an external power source (30) to the electric vehicle (10), a second circuit line section (120) connected to the PD line of the electric vehicle (10) to detect whether the charging / discharging V2L module and the inlet of the electric vehicle are correctly connected, a third circuit line section (130) connected to the power line of the electric vehicle (10) to send power from the electric vehicle (10) to the external load (20) or from the external power source (30) to the electric vehicle (10), a first relay (140) for switching the electrical connection of the first circuit line section (110) and the electrical connection of the second circuit line section (120) depending on whether the external power source (30) is connected, and a second relay (140) for switching the electrical connection of the third circuit line section (130) depending on whether the external power source (30) is connected. It may include a second relay (150) that switches an electrical connection, and a controller (160) that is activated when an external power source (30) is connected and electrically controls the operation of the second relay (150).

[0039] As an example, the first relay (140) may be a DPDT relay that connects between the CP line of the electric vehicle (10) and the first circuit line section (110) and between the PD line of the electric vehicle (10) and the second circuit line section (120), and the second relay (150) may be a DPDT relay that connects between the power line including the L1 line and the L2 / N line of the electric vehicle (10) and the third circuit line section (130).

[0040] Here, in the discharge mode in which an external load (20) is connected to the charge / discharge V2L module (100), the first relay (140) and the second relay (150) are connected to the NC (Nomally Close) contact, and in the charge mode in which an external power source (30) is connected to the charge / discharge V2L module (100), the first relay (140) and the second relay (150) can be connected to the NO (Nomally Open) contact.

[0041] That is, depending on whether an external load (20) or an external power source (30) is connected to the charge / discharge V2L module (100), the connection contacts of the first relay (140) and the connection contacts of the second relay (150) are changed, thereby changing the current flow of the first circuit line section (110), the second circuit line section (120), and the third circuit line section (130).

[0042] Meanwhile, the first circuit line section (110) can be connected to the CP line of the electric vehicle (10) when connecting the electric vehicle charging / discharging V2L module (100) to the inlet of the electric vehicle (10).

[0043] In a discharge mode in which an external load (20) is connected to a V2L module (100) for charging and discharging an electric vehicle, the V2L module (100) for charging and discharging an electric vehicle can distinguish whether the first switch (S4) is open or closed by utilizing the first circuit line section (110). That is, the first switch (S4) may be a discharge mode start / stop button for starting the supply of power to the outside of the electric vehicle (10).

[0044] For example, the first circuit line section (110) may include a first line (111) connected to the NC contact of the first relay (150) connected to the CP line of the electric vehicle (10) and a second line (112) connected to the NO contact of the first relay (150). Here, the first line (111) may be provided with a first switch (S4) which is a discharge switch, and the second line (112) may be connected to a controller (160).

[0045] That is, in the discharge mode in which an external load (20) is connected to the charge / discharge V2L module (100), the first relay (140) connected to the CP line can be connected to the first line (111) of the first circuit line section (110) through the NC contact, and in the charge mode in which an external power source (30) is connected to the charge / discharge V2L module (100), the first relay (140) connected to the CP line can be connected to the second line (112) through the NO contact.

[0046] In a charging mode in which an external power source (30) is connected to a V2L module (100) for charging and discharging an electric vehicle, a controller (160) of the V2L module (100) for charging and discharging an electric vehicle can apply a CP signal in the form of a PWM waveform to the electric vehicle (10) through a second line (112) of a first circuit line section (110). The CP signal refers to a signal for exchanging vehicle information between an external power source (30) and the electric vehicle (10).

[0047] The second circuit line section (120) can be connected to the PD line of the electric vehicle (10) when connecting the electric vehicle charging / discharging V2L module (100) to the inlet of the electric vehicle (10).

[0048] For example, the second circuit line unit (120) may include a third line (121) connected to the NC contact of the first relay (150) connected to the PD line of the electric vehicle (10), and a fourth line (122) connected to the NO contact of the first relay (150). Here, the third line (121) may be provided with a first resistor (R1), and the fourth line (122) may be provided with a second resistor (R2). In addition, the second circuit line unit (120) may include a second switch (S3) connected to the third line (121) and the fourth line (122), respectively. The second switch (S3) may be a switch for temporarily stopping the charge / discharge V2L module (100) during the discharge mode or the charge mode in order to assemble or disassemble it from the electric vehicle (10).

[0049] That is, in the discharge mode in which an external load (20) is connected to the charge / discharge V2L module (100), the first relay (140) connected to the CP line may be connected to the first line (111) of the first circuit line section (110) through the NC contact, and the first relay (140) connected to the PD line may be connected to the third line (121) of the second circuit line section (120) through the NC contact. In addition, in the charge mode in which an external power source (30) is connected to the charge / discharge V2L module (100), the first relay (140) connected to the CP line may be connected to the second line (112) of the first circuit line section (110) through the NO contact, and the first relay (140) connected to the PD line may be connected to the third line (122) of the second circuit line section (120) through the NO contact.

[0050] As an example, the second switch (R3) may be a DPDP switch.

[0051] Accordingly, the second circuit line section (120) may further include a fifth line (123) connected to the NO contact of the second switch (S3) connected to the third line (121), a sixth line (124) connected to the NC contact of the second switch (S3) connected to the third line (121), a seventh line (125) connected to the NO contact of the second switch (S3) connected to the fourth line (122), and an eighth line (126) connected to the NC contact of the second switch (S3) connected to the fourth line (122). Here, the fifth line (123) may be provided with a third resistor (R3), and the seventh line (125) may be provided with a fourth resistor (R4).

[0052] The PD sensing voltage of the electric vehicle (10) changes depending on whether the second switch (S3) of the second circuit line section (120) is connected to the NC contact or the NO contact, and the electric vehicle (10) can determine whether the electric vehicle charging / discharging V2L module (100) is connected (discharge mode or charge mode) depending on the change in the PD sensing voltage.

[0053] In discharge mode, the first switch (S4) of the charging / discharging V2L module (100) for an electric vehicle may be in a closed state, and the second switch (S3) may be connected to the NC contact. In addition, in charge mode, the first switch (S4) of the charging / discharging V2L module (100) for an electric vehicle may be in an open or closed state, and the second switch (S3) may be connected to the NO contact.

[0054] The third circuit line section (130) can be connected to the power line of the electric vehicle (10) when the electric vehicle charging / discharging V2L module (100) is connected to the inlet of the electric vehicle (10). This third circuit line section (130) is for transmitting power from the electric vehicle (10) to an external load (20) or from an external power source (30) to the electric vehicle (10).

[0055] For example, the third circuit line section (130) may include a ninth line (131) connected to the NO contact of the second relay (150) connected to the L1 line, a tenth line (132) connected to the NC contact of the second relay (150) connected to the L1 line, an eleventh line (133) connected to the NO contact of the second relay (150) connected to the L2 / N line, and a twelfth line (134) connected to the NC contact of the second relay (150) connected to the L2 / N line. Here, the ninth line (131) and the eleventh line (133) may be provided with an inlet (I) to which an external power source (30) is connected, and the tenth line (132) and the twelfth line (134) may be provided with an outlet (O) to which an external load (20) is connected.

[0056] That is, in the discharge mode in which an external load (20) is connected to the charge / discharge V2L module (100), the second relay (150) connected to the L1 line may be connected to the 10th line (132) of the third circuit line section (130) via the NC contact, and the second relay (150) connected to the L2 / N line may be connected to the 12th line (134) of the third circuit line section (130) via the NC contact. In addition, in the charge mode in which an external power source (30) is connected to the charge / discharge V2L module (100), the second relay (150) connected to the L1 line may be connected to the 9th line (131) of the third circuit line section (130) via the NO contact, and the second relay (150) connected to the L2 / N line may be connected to the 11th line (133) of the third circuit line section (130) via the NO contact. That is, the third circuit line section (130) can transmit power from the electric vehicle (10) to the external load (20) in a discharge mode in which an external load (20) is connected to the outlet (O), and can transmit power from the external power source (30) to the electric vehicle (10) in a charging mode in which an external power source (30) is connected to the inlet (I).

[0057] The controller (160) can electrically control the operation of the second relay (150).

[0058] The controller (160) can be activated by the external power source (30) when the external power source (30) is connected to the charging / discharging V2L module (100) for an electric vehicle. The first relay (140) can switch the NC contact to the NO contact when the external power source (30) is connected to the charging / discharging V2L module (100) for an electric vehicle. In addition, as the activated controller (160) controls the second relay (150) to switch the NC contact of the second relay (150) to the NO contact, a charging mode for charging power to the electric vehicle (10) can be performed. That is, when the external power source (30) is connected, the controller (160) can detect this and be activated to operate the second relay (150).

[0059] FIG. 5 is a circuit diagram showing an operation standby state of a charge / discharge V2L module for an electric vehicle in a discharge mode according to an embodiment of the present invention, FIG. 6 is a circuit diagram showing an operation state of a charge / discharge V2L module for an electric vehicle in a discharge mode according to an embodiment of the present invention, and FIG. 7 is a circuit diagram showing a pause state of a charge / discharge V2L module for an electric vehicle in a discharge mode according to an embodiment of the present invention.

[0060] The discharge mode of the charging / discharging V2L module (100) for an electric vehicle will be described with reference to FIGS. 5 to 7.

[0061] Fig. 5 shows a discharge mode standby state. As illustrated in Fig. 5, in the discharge mode standby state, an external load (20) may be connected to an outlet (O) of a charging / discharging V2L module (100) for an electric vehicle, a first switch (S4) may be in an open state, and a second switch (S3) may be connected to an NC contact. In addition, in the discharge mode standby state, a CP line of an electric vehicle (10) may be connected to a first line (111) of a first circuit line section (110) via an NC contact of a first relay (140), and a PD line of an electric vehicle (10) may be connected to a third line (121) of a second circuit line section (120) via an NC contact of a first relay (140). In addition, the L1 line of the electric vehicle (10) may be connected to the 10th line (132) of the 3rd circuit line section (130) via the NC contact of the 2nd relay (150), and the L2 / N line of the electric vehicle (10) may be connected to the 12th line (134) of the 3rd circuit line section (130) via the NC contact of the 2nd relay (150). The charge / discharge control system of the electric vehicle (10) may determine whether the connection state of the charge / discharge V2L module (100) is a discharge mode based on the PD sensing voltage of the PD line.

[0062] Fig. 6 illustrates the discharge mode operating state. As illustrated in Figs. 5 and 6, when the first switch (S4) is closed in the discharge mode standby state, the state can be switched to the discharge mode operating state. The first switch (S4) can be a discharge mode start button when an external load (20) is connected.

[0063] That is, when the first switch (S4) is closed, the CP sensing voltage of the electric vehicle (10) increases and the discharge mode starts, and the power of the electric vehicle (10) can be output to the external load (20) through the 10th line (132) of the 3rd circuit line section (130) connected to the L1 line and the 12th line (134) of the 3rd circuit line section (130) connected to the L2 / N line. In this way, the charge / discharge V2L module (100) can operate as a discharge module.

[0064] Fig. 7 shows the discharge mode pause state. As shown in Figs. 6 and 7, in the discharge mode operating state, when the second switch (S3) is operated and the NC contact of the second switch (S3) is switched to the NO contact, the discharge mode pause state can be switched.

[0065] That is, when the NC contact of the second switch (S3) is switched to the NO contact, the resistance value of the second circuit line portion (120) connected to the PD line may be changed to R1+R3. As the resistance value of the second circuit line portion (120) is changed, the PD sensing voltage of the electric vehicle (10) also changes, and the discharge mode may be temporarily stopped by the changed PD sensing voltage.

[0066] FIG. 8 is a circuit diagram showing an operating state of a V2L module for charging and discharging an electric vehicle in a charging mode according to one embodiment of the present invention, and FIG. 9 is a circuit diagram showing a pause state of a V2L module for charging and discharging an electric vehicle in a charging mode according to one embodiment of the present invention.

[0067] The charging mode of the V2L module (100) for charging and discharging electric vehicles will be described with reference to FIGS. 8 and 9.

[0068] Fig. 8 shows the charging mode operating state. As shown in Fig. 8, when an external power source (30) is connected to the inlet (I) of the charging / discharging V2L module (100) for an electric vehicle, the controller (160) can detect the external power source (30) and be activated.

[0069] The first relay (140) connected to the CP line can recognize the external power source (30) and switch the NC contact to the NO contact. The CP line of the electric vehicle (10) can be connected to the second line (112) of the first circuit line section (110) through the NO contact of the first relay (140). In addition, the first relay (140) connected to the PD line can recognize the external power source (30) and switch the NC contact to the NO contact. The PD line of the electric vehicle (10) can be connected to the fourth line (122) of the second circuit line section (120) through the NO contact of the first relay (140).

[0070] In the charging mode operation state, the resistance value of the second circuit line section (120) connected to the PD line may be R2. The charging / discharging control system of the electric vehicle (10) can determine whether the connection state of the charging / discharging V2L module (100) is in the charging mode based on the PD sensing voltage of the PD line.

[0071] The controller (160) can generate a CP signal in the form of a PWM waveform and apply it to the electric vehicle (10) through the first circuit line section (110) connected to the CP line of the electric vehicle (10).

[0072] The controller (160) can switch the NC contact of the second relay (150) connected to the L1 line to a NO contact. The L1 line of the electric vehicle (10) can be connected to the ninth line (131) of the third circuit line section (130) through the NO contact of the second relay (150). The controller (160) can switch the NC contact of the second relay (150) connected to the L2 / N line to a NO contact. The L2 / N line of the electric vehicle (10) can be connected to the eleventh line (133) of the third circuit line section (130) through the NO contact of the second relay (150).

[0073] That is, when an external power source (30) is connected to the inlet (I) of the charge / discharge V2L module (100), the first relay (140) switches, the controller (160) is activated and controls the second relay (150) to switch, and the power of the external power source (30) can be input to the electric vehicle (10) through the ninth line (131) of the third circuit line section (130) connected to the L1 line and the eleventh line (133) of the third circuit line section (130) connected to the L2 / N line. In this way, the charge / discharge V2L module (100) can operate as a charging module.

[0074] Fig. 9 shows a charging mode pause state. As shown in Figs. 8 and 9, in the charging mode operating state, when the second switch (S3) is operated and the NC contact of the second switch (S3) is switched to the NO contact, the charging mode pause state can be switched.

[0075] That is, when the NC contact of the second switch (S3) is switched to the NO contact, the resistance value of the second circuit line portion (120) connected to the PD line may be changed to R2+R4. As the resistance value of the second circuit line portion (120) is changed, the PD sensing voltage of the electric vehicle (10) also changes, and the charging mode may be temporarily stopped by the changed PD sensing voltage.

[0076] As described above, the electric vehicle charging / discharging V2L module (100) of the present invention can perform a discharge mode or a charge mode with one product depending on whether an external load (20) or an external power source (30) is connected, thereby providing consumer convenience.

[0077] Meanwhile, the charging / discharging V2L module of the present invention can also be applied as a charging / discharging V2G (Vehicle to Grid) module. V2G is a technology that transmits stored battery power of an electric vehicle to the power grid, allowing the electric vehicle battery to function as an energy storage facility. In other words, when the charging / discharging V2L module is applied as a V2G module, the charging / discharging V2L module can be connected to the power grid or facilities instead of an external load.

[0078] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will readily appreciate that the present invention can be readily modified into other specific forms without altering the technical spirit or essential characteristics of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single entity may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined manner.

[0079] The scope of the present invention is indicated by the claims described below, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

[0080] Description of the symbol

[0081] 10 electric vehicles

[0082] 20 External load

[0083] 30 External power

[0084] 100 V2L charging / discharging module for electric vehicles

[0085] 110 1st circuit line section

[0086] 111 First Line

[0087] 112 2nd line

[0088] 120 Second circuit line section

[0089] 121 Third Line

[0090] 122 4th line

[0091] 123 5th line

[0092] 124 6th line

[0093] 125 7th Line

[0094] 126 8th line

[0095] 130 3rd Circuit Line Section

[0096] 131 9th Line

[0097] 132 Line 10

[0098] 133 Line 11

[0099] 134 Line 12

[0100] 140 1st Relay

[0101] 150 2nd Relay

[0102] 160 controller

[0103] S4 1st switch

[0104] S3 2nd switch

[0105] R1 first resistor

[0106] R2 Second resistor

[0107] R3 Third resistor

[0108] R4 4th resistor

[0109] O Outlet

[0110] I inlet

Claims

1. A V2L charging / discharging module for an electric vehicle that is connected to the inlet and external load of the electric vehicle to supply power from the electric vehicle to the external load, or that is connected to the inlet and external power source of the electric vehicle to charge power from the external power source to the electric vehicle. A first circuit line section connected to a CP line of the electric vehicle to apply a CP signal from an external power source to the electric vehicle; A second circuit line section connected to the PD line of the electric vehicle to detect whether the charging / discharging V2L module and the inlet of the electric vehicle are correctly connected; A third circuit line section connected to a power line of the electric vehicle to transmit power from the electric vehicle to the external load or from the external power source to the electric vehicle; A first relay that switches the electrical connection of the first circuit line section and the electrical connection of the second circuit line section depending on whether an external power source is connected; A second relay for switching the electrical connection of the third circuit line section depending on whether an external power source is connected; and A V2L module for charging and discharging an electric vehicle, comprising a controller that is activated when an external power source is connected and electrically controls the operation of the second relay.

2. In paragraph 1, The above first relay is a DPDT relay that connects between the CP line of the electric vehicle and the first circuit line section and between the PD line of the electric vehicle and the second circuit line section, A V2L charging / discharging module for an electric vehicle, characterized in that the second relay is a DPDT relay connecting between a power line including the L1 line and the L2 / N line of the electric vehicle and the third circuit line section.

3. In paragraph 2, In the discharge mode in which the external load is connected to the above charging / discharging V2L module, the first relay and the second relay are connected to the NC (Nomally Close) contact, A charging / discharging V2L module for an electric vehicle, characterized in that in a charging mode in which the external power source is connected to the charging / discharging V2L module, the first relay and the second relay are connected to a NO (Nomally Open) contact.

4. In paragraph 3, The first circuit line section includes a first line connected to the NC contact of the first relay connected to the CP line and a second line connected to the NO contact of the first relay, A V2L charging / discharging module for an electric vehicle, characterized in that the first line is equipped with a first switch and the second line is connected to the controller.

5. In paragraph 4, The second circuit line section includes a third line connected to the NC contact of the first relay connected to the PD line and equipped with a first resistor, a fourth line connected to the NO contact of the first relay connected to the PD line and equipped with a second resistor, and a second switch connected to each of the third line and the fourth line. A V2L module for charging and discharging electric vehicles, characterized in that the second switch is a DPDP switch.

6. In paragraph 5, The second circuit line section includes a fifth line connected to the NO contact of the second switch connected to the third line, a sixth line connected to the NC contact of the second switch connected to the third line, a seventh line connected to the NO contact of the second switch connected to the fourth line, and an eighth line connected to the NC contact of the second switch connected to the fourth line. A V2L charging / discharging module for an electric vehicle, characterized in that a third resistor is provided in the fifth line and a fourth resistor is provided in the seventh line.

7. In paragraph 5, The third circuit line section includes a ninth line connected to the NO contact of the second relay connected to the L1 line, a tenth line connected to the NC contact of the second relay connected to the L1 line, an eleventh line connected to the NO contact of the second relay connected to the L2 / N line, and a twelfth line connected to the NC contact of the second relay connected to the L2 / N line. A V2L charging / discharging module for an electric vehicle, characterized in that the 9th line and the 11th line are provided with an inlet to which an external power source is connected, and the 10th line and the 12th line are provided with an outlet to which an external load is connected.

8. In paragraph 7, A V2L charging / discharging module for an electric vehicle, characterized in that when the external load is connected to the outlet, the module switches to a discharge standby mode, and then, when the first switch is closed, a discharge mode for supplying power from the electric vehicle to the external load is performed.

9. In paragraph 7, A V2L module for charging and discharging an electric vehicle, characterized in that when the external power is connected to the inlet, the first relay recognizes the external power and switches the NC contact to the NO contact, and the controller controls the second relay to be activated by the external power and switch the NC contact of the second relay to the NO contact, thereby performing a charging mode for charging power to the electric vehicle.

10. In paragraph 8, A V2L charging / discharging module for an electric vehicle, characterized in that when the second switch is operated during the discharge mode and the NC contact of the second switch is switched to the NO contact, the discharge mode is put into a pause state.

11. In paragraph 9, A V2L charging / discharging module for an electric vehicle, characterized in that when the second switch is operated during the charging mode and the NC contact of the second switch is switched to the NO contact, the charging mode is put into a pause state.

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