Charging apparatus for electric vehicles

Abstract

A charging apparatus for electric vehicles, according to an embodiment of the present invention, comprises: a supply module for a first mode in which a first PWM signal is supplied to the outside; a charging module for a second mode in which a second PWM signal is received from the outside; and a control unit that controls the supply module and the charging module, wherein the supply module includes a signal output unit that outputs the first PWM signal and a switch, and during operation in the first mode, the switch is turned on, and during operation in the second mode, the switch is turned off, and the on / off of the switch is controlled by the control unit.

Description

Charging devices for electric vehicles

[0001] The present invention relates to electric vehicles, and more particularly to charging for electric vehicles.

[0002] Eco-friendly vehicles such as electric vehicles (EVs) or plug-in hybrid electric vehicles (PHEVs) use electric vehicle supply equipment (EVSE) installed at charging stations to charge their batteries.

[0003] To charge an EV, the EV and EVSE communicate via a charging connector connected between them. Once the charging connector is connected, charging begins after signaling is performed between the EVSE and EV.

[0004] The charging connector features a CP (control pilot) pin, through which a PWM (Pulse Wide Modulation) CP signal is transmitted from the EVSE to the EV. The interaction between the EVSE and the EV can be monitored and controlled through this CP signal, and the voltage level of the CP signal can vary depending on the charging state. Accordingly, the EV's charging device must detect the voltage level of the CP signal. A method for accurately and efficiently detecting the voltage level of the CP signal is needed.

[0005] Meanwhile, the construction of charging infrastructure, such as EVSEs, requires significant time, space, and cost. Furthermore, charging EVs on EVSEs takes considerable time, hindering the commercialization of EVs. To address these issues, technologies supporting vehicle-to-vehicle (V2V) charging are needed.

[0006] The technical problem to be solved by the present invention is to provide a charging device for charging an electric vehicle (EV).

[0007] A charging device for an electric vehicle according to one embodiment of the present invention includes a supply module for a first mode that supplies a first PWM signal to the outside, a charging module for a second mode that receives a second PWM signal from the outside, and a control unit that controls the supply module and the charging module, wherein the supply module includes a signal output unit that outputs the first PWM signal and a switch, and when operating in the first mode, the switch is turned on, and when operating in the second mode, the switch is turned off, and on / off of the switch is controlled by the control unit.

[0008] The charging module includes a CP (control pilot) line for receiving a control pilot signal, and the switch can be connected to the control unit, the signal output unit, and the CP line.

[0009] The above signal output unit can output the first PWM signal having a maximum peak voltage of +12V±1V and a minimum peak voltage of -12V±1V.

[0010] The above signal output unit can be controlled by the above control unit.

[0011] When operating in the second mode, the flow of current from the CP line toward the signal output unit and the flow of current from the signal output unit toward the CP line can be blocked by the switch.

[0012] The above switch may include an optical switch.

[0013] The above optical switch may include a light-sensitive metal oxide semiconductor field effect transistor (MOSFET) element.

[0014] The above optical switch may include a light-emitting element connected to the control unit, and a MOSFET (metal oxide semiconductor field effect transistor) element turned on by the light-emitting element.

[0015] When the above control unit outputs a control signal to turn on the switch, the light-emitting element and the MOSFET element can be sequentially turned on.

[0016] The above MOSFET element may have one end connected to the signal output section and the other end connected to the charging module.

[0017] The other end of the above MOSFET element can be connected to the CP (control pilot) line of the charging module.

[0018] The above MOSFET device may include two N-channel FETs coupled in both directions.

[0019] One end of the above light-emitting element can be connected to the control unit, and the other end can be connected to ground through a resistor.

[0020] The charging module may include a duty detection unit that detects a duty ratio of the second PWM signal and a voltage detection unit that detects at least one of a positive voltage and a negative voltage of the second PWM signal.

[0021] The above duty detection unit can further detect the duty ratio of the first PWM signal.

[0022] The voltage detection unit can further detect at least one of the positive voltage and negative voltage of the first PWM signal.

[0023] The above control unit can operate in the first mode or the second mode.

[0024] According to embodiments of the present invention, a charging device can be provided that operates not only in a charging mode, in which an EV receives power from an external source, but also in a supply mode, in which it supplies power to other EVs. In particular, embodiments of the present invention can provide a charging device that supports both charging and supply modes without significantly increasing cost and size, and that enables accurate status detection, resulting in high reliability.

[0025] FIGS. 1 and 2 are drawings showing a charging system for an electric vehicle according to one embodiment of the present invention.

[0026] Figures 3 and 4 are examples of electrical equivalent circuits for charging between an EVSE and an EV.

[0027] Figure 5 shows a CP signal in PWM form output by EVSE.

[0028] Figures 6 and 7 are block diagrams of a charging system according to one embodiment of the present invention.

[0029] FIG. 8 is a block diagram of a charging module of a charging device in a charging system according to one embodiment of the present invention.

[0030] FIG. 9 is a charging device included in a charging system according to one embodiment of the present invention.

[0031] FIG. 10 is an example of a charging system including the charging device of FIG. 9.

[0032] FIG. 11 is another example of a charging system including the charging device of FIG. 9.

[0033] FIG. 12 is a circuit diagram for simulating the first mode operation of a charging device according to an embodiment of the present invention.

[0034] Figure 13 is a result of simulating the first mode operation of a charging device according to an embodiment of the present invention.

[0035] Fig. 14 is a circuit diagram for simulating the second mode operation of a charging device according to an embodiment of the present invention.

[0036] Figure 15 is a result of simulating the second mode operation of a charging device according to an embodiment of the present invention.

[0037] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0038] However, the technical idea of ​​the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of ​​the present invention, one or more of the components between the embodiments can be selectively combined or substituted for use.

[0039] In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which the present invention belongs, unless explicitly and specifically defined and described, and terms that are commonly used, such as terms defined in a dictionary, may be interpreted in consideration of the contextual meaning of the relevant technology.

[0040] Additionally, the terms used in the embodiments of the present invention are intended to describe the embodiments and are not intended to limit the present invention.

[0041] In this specification, the singular may also include the plural unless specifically stated otherwise in the phrase, and when it is described as “A and / or at least one (or more) of B, C”, it may include one or more of all combinations that can be combined with A, B, C.

[0042] Additionally, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

[0043] These terms are intended only to distinguish one component from another, and are not intended to limit the nature, order, or sequence of the component.

[0044] And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, it may include not only cases where the component is directly connected, coupled or connected to the other component, but also cases where the component is 'connected', 'coupled' or 'connected' by another component between the component and the other component.

[0045] Additionally, when described as being formed or arranged "above or below" each component, "above" or "below" includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components. Furthermore, when expressed as "above" or "below", it can include the meaning of a downward direction as well as an upward direction based on one component.

[0046] Hereinafter, embodiments will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or corresponding components are given the same reference numbers, and redundant descriptions thereof will be omitted.

[0047] FIGS. 1 and 2 are drawings showing a charging system for an electric vehicle according to one embodiment of the present invention.

[0048] Referring to FIGS. 1 and 2, an electric vehicle (EV) 10 can be charged from an electric vehicle supply equipment (EVSE) 20. In this specification, an EV (10) refers to a vehicle propelled by an electric motor that draws current from a rechargeable storage battery or other portable energy storage device. Although this specification focuses on an EV (10), it is self-evident that the description can also be applied to a plug-in hybrid electric road vehicle (PHEV).

[0049] For this purpose, a charging cable (22) connected to the EVSE (20) can be connected to the inlet of the EV (10). Here, the EVSE (20) is a facility that supplies AC or DC, and can be placed at a charging station, placed in a home, or implemented to be portable. The EVSE (20) can be used interchangeably with a charging station (supply), an AC charging station (AC supply), a DC charging station (DC supply), a socket-outlet, etc.

[0050] A charging device (Electric Vehicle Charging Controller, EVCC, 100) is mounted within the EV (10) and connected to the EV (10). For example, the charging device (100) may be installed within the trunk of the EV (10), but is not limited thereto.

[0051] Here, the charging device (100) can communicate with the EV (10) and EVSE (20), respectively.

[0052] The method of connecting the EV (10) to the EVSE (20) can be divided into four modes and three cases. Mode 1 is to connect the EV (10) to the AC supply network using a cable and a plug, which is connected to a standard socket outlet. Mode 2 is to connect the EV (10) to the AC supply network using a cable and a plug connected to a standard socket outlet, which has a protection system and CP function to prevent electric shock between the EV and the socket outlet. Mode 3 is to connect the EV (10) using an EVSE (20) permanently connected to the AC supply network, and the CP function is extended to control the devices within the EVSE (20). Mode 4 is to connect the EV (10) to the AC or DC supply network using a dc EVSE or a dc EV charging station using the CP function. Case A is to connect the EV (10) to the AC supply using a cable and plug assembly permanently attached to the EV. Case B connects the EV (10) to the supply using a detachable cable assembly at both ends. Case C connects the EV (10) to the supply using a supply cable and vehicle connector permanently attached to the EV charging station.

[0053] A cable assembly between an EV (10) and an EVSE (20) may be provided with a CP conductor, which is an insulated conductor that creates a CP circuit, together with a PE (protective conductor). Here, the CP circuit is a circuit designed for signal transmission or communication between the EV (10) and the EVSE (20), and the CP function may be used to monitor and control the interaction between the EV (10) and the EVSE (20). A CPF controller (control pilot function controller), which is a device that manages the CP signal and the CP function, may be provided in the EVSE (20). The proximity function may be an electrical or mechanical means that indicates a state in which a connector is inserted into an inlet of an EV (10), or a state in which a plug is inserted into a socket outlet at a charging station.

[0054] In Mode 2, Mode 3 and Mode 4, the EVSE (20) has the function of checking continuous continuity of the protective earthing conductor, verifying that the EV (10) is properly connected to the EVSE (20), supplying power to the EV (10), cutting off power supplied to the EV (10), and transmitting maximum current information. Here, in order to supply power to the EV (10), the CP function between the EVSE (20) and the EV (10) must be accurately set to a signal state that allows power supply.

[0055] In mode 2, mode 3 and mode 4, the CP function is performed through a CP circuit using PWM (pulse wide modulation).

[0056] Figures 3 and 4 are examples of electrical equivalent circuits for charging between an EVSE and an EV.

[0057] Referring to FIGS. 3 and 4, the EVSE (20) includes an oscillator that generates an AC voltage for charging, and the EV (10) includes a 2.7 kΩ resistor and a switch. Here, Va is the pilot wire voltage measured at the output terminal of the EVSE (20), Vg is the internal voltage of the oscillator, and Vb is the voltage, duty cycle, and frequency measured by the EV (10). The EVSE (20) communicates by setting the duty cycle of a PWM signal or a continuous DC voltage signal. The EVSE (20) can change the duty cycle of the PWM signal. The EV (10) responds by applying a resistive load to the positive half-wave of the CP circuit. If the EV (10) draws a current higher than the CP function (duty cycle), the EVSE (20) can open its switching device. At this time, the EVSE (20) will follow the conditions for the allowed response time of the EV (10), the current tolerance with respect to the duty cycle generated by the EVSE (20), and the tolerance of the current measurement in the EVSE (20) itself. The amount of voltage charged to the battery can be controlled by turning on and off the switch connected to the resistor on the EV (10) side.

[0058] Figure 5 shows a CP signal in PWM form output by EVSE.

[0059] Referring to Fig. 5, the EVSE (20) outputs a CP signal in the form of a PWM having a maximum voltage of +12 V and a minimum voltage of -12 V. The charging device (100) of the EV (10) detects the duty cycle and voltage size of the CP signal to monitor and control the status.

[0060] The states according to the CP signal can be divided into state A, state B, state C, state D, state E, and state F. State A means a state in which the charger is not connected between the EVSE (20) and the EV (10), that is, an unplugged state, and when the peak of the CP signal is +12 V ± 1 V, it is determined to be state A. State B means a state in which the charger is connected between the EVSE (20) and the EV (10), that is, a plugged state, and may mean a state in which charging is ready. When the maximum voltage of the CP signal is +9 V ± 1 V and the minimum voltage is -12 V ± 1 V, it is determined to be state B. State C and state D mean a state in which charging is in progress, that is, a charging state, and in particular, state D may mean a state in which ventilation is required during charging. When the maximum voltage of the CP signal is +6V±1V and the minimum voltage is -12V±1V, it is determined to be in the C state, and when the maximum voltage of the CP signal is +3V±1V and the minimum voltage is -12V±1V, it is determined to be in the D state. The E state and the F state may indicate error states. For example, the E state may indicate a state in which power is not supplied to the EVSE (20), and the F state may indicate a state in which the EVSE (20) is unavailable. When the maximum voltage of the CP signal is +0V±1V and the minimum voltage is -12V±1V, it is determined to be in the E state, and when the maximum voltage of the CP signal is -12V±1V and the minimum voltage is -12V±1V, it is determined to be in the F state.

[0061] Meanwhile, sleep mode is a mode for energy saving, and the EV (10) and EVSE (20) can enter sleep mode after negotiating a pause through the HLC protocol. On the EVSE (20) side, sleep mode means that the oscillator is turned off, the +12 V supply of the pilot line is maintained, and the power of the lower layer communication module is turned off. On the EV (10) side, sleep mode means the B state, and the power of the lower layer communication module can be turned off. The wake-up mechanism may also be used after the charging session has already ended so that the counterpart station can reset the HLC.

[0062] Interaction between the EVSE (20) and the EV (10) can be monitored and controlled through the CP signal, and as described above, the voltage level of the CP signal can vary depending on the charging state. Accordingly, the charging device (100) of the EV (10) must accurately detect the voltage level of the CP signal.

[0063] In general, the charging device (100) can detect the positive voltage, which is the maximum voltage, and the negative voltage, which is the minimum voltage, of the CP signal, and determine the charging state between the EVSE (20) and the EV (10) based on the detected maximum and minimum voltages. According to an embodiment of the present invention, the charging device (100) aims to efficiently monitor the charging state between the EVSE (20) and the EV (10) based on the CP signal.

[0064] FIGS. 6 and 7 are block diagrams of a charging system according to one embodiment of the present invention, and FIG. 8 is a block diagram of a charging module of a charging device in a charging system according to one embodiment of the present invention.

[0065] Referring to FIGS. 6 and 7, the first EV (600) may be connected to an EVSE (700) or may be connected to a second EV (800), which is another EV. The first EV (600) may operate in a first mode for supplying power to an external source, or in a second mode for receiving power from an external source. For example, the first EV (600) may be connected to an EVSE (700) and may operate in a second mode for receiving power from the EVSE (700). Alternatively, the first EV (600) may be connected to a second EV (800) and may operate in a first mode for supplying power to the second EV (800), or in a second mode for receiving power from the second EV (800).

[0066] In this specification, the first mode for supplying power externally may be used interchangeably with the EVSE mode, the V2V (Vehicle to Vehicle) mode, or the supply mode. Furthermore, the second mode for receiving power externally may be used interchangeably with the EV mode or the charging mode.

[0067] Each of the first EV (600) and the second EV (800) is equipped with a charging device (100). Generally, the charging device (100) is initially set to operate in a second mode in which power is supplied from an external source, and can be changed to operate in a first mode by a user setting or a control unit. To this end, the charging device (100) must include a module supporting an EVSE (20) function along with a module supporting an EV (10) function as shown in FIGS. 3 and 4.

[0068] According to an embodiment of the present invention, a charging device (100) includes a connection unit (110), a supply module (120), a charging module (130), and a control unit (140). Since the embodiment of the present invention relates to a method and device for detecting a CP signal, for convenience of explanation, the description will focus on CP signal detection of the charging device (100). Except for the content regarding CP signal detection, known technologies regarding the charging device (100) can be applied to other content.

[0069] The control unit (140) controls the connection unit (110), the supply module (120), and the charging module (130), and generates a control signal for charging between the first EV (600), the EVSE (700), and the second EV (800). The control signal for charging generated by the control unit (140) may be transmitted to the EVSE (700) or the second EV (800) through the connection unit (110), or may be transmitted to the ECU (610) in the first EV (600).

[0070] The connection unit (110) is connected to the EVSE (700) or the second EV (800) and transmits signals between the control unit (140) and the EVSE (700) or the second EV (800). For example, the connection unit (110) may transmit a charging-related signal received from the EVSE (700) or the second EV (800) to the control unit (140), and transmit a control signal for charging generated by the control unit (140) to the EVSE (700) or the second EV (800). In addition, the connection unit (110) may transmit power received from the EVSE (700) or the second EV (800) to the battery (620) in the first EV (600) according to the control signal for charging generated by the control unit (140). Alternatively, the connecting portion (110) may transmit power to the second EV (800) according to a control signal for charging generated by the control portion (140).

[0071] Meanwhile, the supply module (120) supports a first mode for supplying power to the outside, i.e., EVSE mode, V2V (Vehicle to Vehicle) mode, or supply mode. To this end, the supply module (120) includes at least a part of the EVSE (20) side functions illustrated in FIGS. 3 and 4. That is, the supply module (120) generates a first PWM (Pulse Wide Modulation) signal and transmits the first PWM signal to the second EV (800). The charging module (130) supports a second mode for receiving power from the outside, i.e., EV mode or charging mode. That is, the charging module (130) receives a second PWM (Pulse Wide Modulation) signal from the EVSE (700) or the second EV (800).

[0072] The supply module (120) and the charging module (130) can be selectively driven. For example, when the charging device (100) operates in a first mode in which it supplies power to the outside, the supply module (120) can be activated, and when the charging device (100) operates in a second mode in which it receives power from the outside, the charging module (130) can be activated. When the supply module (120) is activated, at least some functions of the charging module (130) can be deactivated, and when the charging module (130) is activated, at least some functions of the supply module (120) can be deactivated. For example, when the charging module (130) is activated, the first PWM signal generation function of the supply module (120) can be turned off. For example, if the charging module (130) is initially set to be activated and the charging device (100) wishes to operate in the first mode, at least some functions of the charging module (130) may be deactivated and the supply module (120) may be activated by user settings or control of the control unit (140). For example, if the charging module (130) is initially set to be activated and the charging device (100) wishes to operate in the first mode, the supply module (120) may additionally be activated by user settings or control of the control unit (140).

[0073] Meanwhile, when the charging device (100) operates in the second mode, the connection unit (110) receives a CP (Control Pilot) signal in the form of PWM (Pulse Wide Modulation) from the EVSE (700) or the second EV (800). Here, the CP signal is a signal in the form of PWM having a predetermined duty cycle, and may be in the form exemplified in FIG. 5. The CP signal is a signal for monitoring and controlling the interaction between the first EV (600) and the EVSE (700) or the interaction between the first EV (600) and the second EV (800). The charging device (100) detects the duty cycle, positive voltage, and negative voltage of the CP signal in the form of PWM received from the EVSE (700) or the second EV (800), and can monitor the charging status and control charging based on these.

[0074] Referring to FIG. 8, the charging module (130) includes a duty detection unit (131) for detecting the duty of the CP signal and a voltage detection unit (132) for detecting the voltage of the CP signal. The voltage detection unit (132) detects positive and negative voltages of the CP signal. The duty detection unit (131) and the voltage detection unit (132) are connected to the control unit (140) and can transmit the detected values ​​to the control unit (140). Here, the positive voltage may be the maximum voltage of the CP signal in the form of PWM, i.e., the positive voltage peak, and the negative voltage may be the minimum voltage of the CP signal in the form of PWM, i.e., the negative voltage peak. The duty detection unit (131) and the voltage detection unit (132) may be implemented by a monitoring resistor (Rm) and a monitoring capacitor (Cm) on the EV (10) side, as illustrated in FIG. 4.

[0075] According to an embodiment of the present invention, the charging module (130) can detect the duty and voltage of the second PWM signal supplied from an external EVSE (700) or a second EV (800). Alternatively, the charging module (130) can also detect the duty and voltage of the first PWM signal output by the supply module (120) of the charging device (100) of the first EV (600) and transmit the same to the control unit (140). Accordingly, the charging device (100) can quickly diagnose a failure of the supply module (120).

[0076] FIG. 9 is a charging device included in a charging system according to one embodiment of the present invention, FIG. 10 is an example of a charging system including the charging device of FIG. 9, and FIG. 11 is another example of a charging system including the charging device of FIG. 9.

[0077] Referring to FIGS. 9 to 11, a charging system according to an embodiment of the present invention includes a charging device (100). The charging device (100) can be mounted on an EV. When the charging device (100) according to an embodiment of the present invention is mounted on a first EV (600) of FIGS. 6 to 7, the charging device (100) can be connected to an EVSE (700) or a second EV (800) of FIGS. 6 to 7. In FIG. 10, the charging device (100) mounted on the first EV (600) is illustrated as being connected to the second EV (800), but is not limited thereto and can also be connected to the EVSE (700). The second EV (800) can be a charging device that includes only a charging module (130) operating in a second mode, or a charging device that includes both a supply module (120) operating in a first mode and a charging module (130) operating in a second mode.

[0078] According to an embodiment of the present invention, the charging device (100) may be connected to a second EV (800) and may operate in a first mode to supply power to the second EV (800). Alternatively, the charging device (100) may be connected to a second EV (800) and may operate in a second mode to receive power from the second EV (800). Alternatively, the charging device (100) may be connected to an EVSE (700) and may operate in a second mode to receive power from the EVSE (700).

[0079] To this end, the charging device (100) includes a supply module (120) for a first mode that transmits a first PWM signal to the outside and a charging module (130) for a second mode that receives a second PWM signal from the outside. The charging module (130) includes a PD (proximity detection) line that receives a connector proximity detection signal and a CP (control pilot) line that receives a control pilot signal. In addition, as described above, the charging module (130) includes a duty detection unit (131) that detects the duty of the CP signal and a voltage detection unit (132) that detects the positive and negative voltages of the CP signal.

[0080] The duty detection unit (131) and voltage detection unit (132) of the charging module (130) detect the duty, positive voltage, and negative voltage of the CP signal in the form of PWM received from the outside, i.e., the second PWM signal, and accordingly, the charging status between the EVSE (700) or the second EV (800) supplying power to the charging device (100) and the first EV (600) can be monitored.

[0081] In addition, the duty detection unit (131) and voltage detection unit (132) of the charging module (130) detect the duty, positive voltage, and negative voltage of the CP signal in the form of PWM transmitted to the outside by the supply module (120), i.e., the first PWM signal, and accordingly, when supplying power to the second EV (800), the DTC (diagnostic trouble code) of the charging device (100) in the first EV (600) can be monitored.

[0082] For this purpose, the supply module (120) can be connected to the CP line of the charging module (130).

[0083] According to an embodiment of the present invention, the supply module (120) includes a signal output unit (121) that outputs a first PWM signal and a switch (122) arranged between the signal output unit (121) and the CP line of the charging module (130).

[0084] Referring to FIG. 10, the signal output unit (121) of the supply module (120) includes a PMIC (Power Management Integrated Circuit), a power source, and a PWM generator, and is connected to the control unit (140). When a PWM control signal is input to the PWM generator of the signal output unit (121) through GPIO #2 of the control unit (140), the voltages of +12 V power and -12 V power can be applied to the pulse signal generated by the PWM generator by the PMIC (Power Management Integrated Circuit) of the signal output unit (121). Accordingly, the signal output unit (121) of the supply module (120) generates and outputs a first PWM signal of ±12 V.

[0085] Meanwhile, the charging device (100) of the first EV (600) according to the embodiment of the present invention operates in a first mode for transmitting a first PWM signal to the outside, or in a second mode for receiving a second PWM signal from the outside. When the charging device (100) operates in the second mode, the second PWM signal generated by the external EVSE (700) or the second EV (800) is transmitted to the charging module (130) of the charging device (100) through the CP line. When the charging device (100) according to the embodiment of the present invention supports both the first mode and the second mode, the supply module (120) can also be connected to the CP line of the charging module (130) as described above. When the charging module (130) detects a CP signal in which the maximum voltage is +9 V ± 1 V and the minimum voltage is -12 V ± 1 V in the second mode, it is determined that the external EVSE (700) or the second EV (800) and the EV are in a B state, which is a charger connection and charging preparation state. However, if a part of the second PWM signal generated by the external EVSE (700) or the second EV (800) leaks to the supply module (120), it may be difficult for the charging module (130) to precisely detect the positive and negative voltages of the CP signal, and thus, it may be difficult to accurately detect the charging state. Alternatively, if the first PWM signal generated by the supply module (120) of the charging device (100) affects the second PWM signal generated by the external EVSE (700) or the second EV (800), it may be difficult for the charging module (130) to precisely detect the positive and negative voltages of the CP signal, and thus, it may be difficult to accurately detect the charging state.

[0086] According to an embodiment of the present invention, the supply module (120) includes a switch (122) arranged between the signal output unit (121) and the CP line of the charging module (130). The switch (122) according to the embodiment of the present invention is connected to the control unit (140), the signal output unit (121), and the CP line of the charging module (130), and when the charging device (100) operates in a second mode, the flow of current from the CP line toward the signal output unit (121) and the flow of current from the signal output unit (121) toward the CP line can be blocked by the switch (122). That is, the switch (122) is turned on when the charging device (100) operates in the first mode, and is turned off when the charging device (100) operates in the second mode. Accordingly, when the charging device (100) operates in the first mode, the first PWM signal output by the signal output unit (121) is transmitted to the external second EV (800), but when the charging device (100) operates in the second mode, the problem of the first PWM signal output by the signal output unit (121) affecting the CP signal duty ratio and voltage detection of the charging module (130) can be prevented. In addition, when the charging device (100) operates in the second mode, the problem of a part of the second PWM signal generated by the external EVSE (700) or the second EV (800) leaking to the supply module (120) can be prevented.

[0087] For this purpose, the on / off of the switch (122) is controlled by the control unit (140). For example, the control unit (140) can output a control signal to control the on / off of the switch (122) through GPIO#1.

[0088] More specifically, referring to FIG. 11, the switch (122) may include an optical switch. An optical switch refers to a device that is turned on or off by light. If the switch (122) includes an optical switch, on and off can be switched at a fast response speed without electrical contact with the control unit (140).

[0089] According to an embodiment of the present invention, the optical switch may include a light-sensitive metal oxide semiconductor field effect transistor (MOSFET). The light-sensitive MOSFET may be a device that senses light and becomes conductive. If the optical switch includes a light-sensitive MOSFET, it can be switched on and off at a fast response speed without electrical contact with the control unit (140).

[0090] According to an embodiment of the present invention, the optical switch may include a light-emitting element (122A) and a MOSFET element (122B) that is turned on by the light-emitting element (122A). At this time, the light-emitting element (122A) is connected to the control unit (140), one end of the MOSFET element (122B) is connected to the signal output unit (121) of the supply module (120), and the other end may be arranged between the charging module (130). When the GPIO #1 of the control unit (140) outputs a control signal for turning on the switch (122), the light-emitting element (122A) connected to the control unit (140) is turned on to output light, and the MOSFET element (122B) that detects the light output by the light-emitting element (122A) may be turned on. Accordingly, the switch (122) is turned on, and the first PWM signal generated by the signal output unit (121) can be output to an external EVSE (700) or a second EV (800).

[0091] More specifically, according to an embodiment of the present invention, the MOSFET element (122B) may include two N-channel FETs that are coupled in both directions. At this time, one end of the light-emitting element (122A) may be connected to the control unit (140), the other end may be connected to the ground through a resistor, one end of the MOSFET element (122B) may be connected to the signal output unit (121) of the supply module (120), and the other end may be connected to the CP line of the charging module (130). When the GPIO #1 of the control unit (140) outputs a control signal to turn on the switch (122), the light-emitting element (122A) connected to the control unit (140) may be turned on to output light, and the MOSFET element (122B) that detects the light output by the light-emitting element (122A) may be turned on. Accordingly, the switch (122) is turned on, and the first PWM signal generated by the signal output unit (121) can be output to the external second EV (800). Accordingly, the switch (122) can be placed within a narrow area, so that the size and manufacturing cost of the charging device (100) can be reduced.

[0092] When the charging device (100) according to the embodiment of the present invention is basically set to operate in the second mode, the control unit (140) can output a control signal for GPIO #1 to turn ON the switch (122) only when the charging device (100) operates in the first mode. Accordingly, in a general state of operating in the second mode, that is, in a state in which the control unit (140) does not output a control signal for GPIO #1 to turn ON the switch (122), the light-emitting element (122A) connected to the control unit (140) is turned OFF, and accordingly, the MOSFET element (122B) is also turned OFF, so that the flow of current from the CP line toward the signal output unit (121) and the flow of current from the signal output unit (121) toward the CP line can be blocked by the switch (122).

[0093] FIG. 12 is a circuit diagram for simulating the first mode operation of a charging device according to an embodiment of the present invention, FIG. 13 is a result of simulating the first mode operation of a charging device according to an embodiment of the present invention, FIG. 14 is a circuit diagram for simulating the second mode operation of a charging device according to an embodiment of the present invention, and FIG. 15 is a result of simulating the second mode operation of a charging device according to an embodiment of the present invention.

[0094] Referring to FIGS. 12 and 13, region A of FIG. 12 may be a charging device according to an embodiment of the present invention, and region B of FIG. 12 may be an external charging device connected to the charging device according to an embodiment of the present invention. That is, region A of FIG. 12 may be a charging device within the first EV (600) of FIGS. 10 to 11, and region B of FIG. 12 may be a charging device within an external EV operating in a charging mode. When the charging device according to an embodiment of the present invention operates in the first mode, the optical switch U1 may be turned on. Accordingly, the first PWM signal generated by the PWM generator V6 may be transmitted to the external charging device shown as region B through the MOSFET element of the optical switch U1. At this time, it can be seen that a voltage of 5 V, which is a voltage of 5 Vdc, is detected at the A1 node of region A, and +9 V, which is a CP line of region B, which is an external charging device, is detected at the B1 node. That is, according to an embodiment of the present invention, when the charging device (100) of the first EV (600) operates in the first mode, it can be seen that when the optical switch U1 is turned on, a normal CP signal of +9 V can be supplied to the external charging device.

[0095] Referring to FIGS. 14 and 15, area A of FIG. 14 is a charging device according to an embodiment of the present invention, and area B of FIG. 14 may be an external EVSE connected to the charging device according to an embodiment of the present invention or an external EV operating in a supply mode. That is, area A of FIG. 14 may be a charging device in the first EV (600) of FIGS. 10 to 11. When the charging device according to an embodiment of the present invention operates in the second mode, the optical switch U1 may be turned off. Accordingly, the second PWM signal generated by the PWM generator V6 of the external EVSE may be transmitted to the charging module (130) of the charging device according to an embodiment of the present invention through the CP line. At this time, since the optical switch U1 is turned off, it can be seen that a voltage of 0 V is detected at the A2 node of area A, and +9 V is detected at the A3 node, which is the CP line of area A. That is, when the charging device according to the embodiment of the present invention operates in the second mode, it can be seen that a normal CP signal of +9 V can be supplied from the external EVSE when the optical switch U1 is turned off.

[0096] Although the present invention has been described above with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below.

[0097] [Explanation of symbols]

[0098] 10: Electric cars

[0099] 20: Electric vehicle charging facilities

[0100] 22: Charging cable

[0101] 100: Charging device

[0102] 110: Connector

[0103] 120: Supply module

[0104] 130: Charging module

[0105] 140: Control Unit

Claims

1. In a charging device for an electric vehicle, A supply module for the first mode, which supplies the first PWM signal to the outside, A charging module for the second mode, which receives a second PWM signal from the outside, and It includes a control unit that controls the supply module and the charging module, The above supply module includes a signal output section and a switch that outputs the first PWM signal, When operating in the above first mode, the switch is turned on, When operating in the above second mode, the switch is turned off. A charging device in which the ON / OFF of the above switch is controlled by the above control unit.

2. In paragraph 1, The above charging module includes a CP (control pilot) line for receiving a control pilot signal, The above switch is a charging device connected to the control unit, the signal output unit and the CP line.

3. In paragraph 2, A charging device in which, when operating in the second mode, the flow of current from the CP line toward the signal output unit and the flow of current from the signal output unit toward the CP line are blocked by the switch.

4. In paragraph 1, The above switch is a charging device including an optical switch.

5. In paragraph 4, The above optical switch is a charging device including a light-sensitive MOSFET (metal oxide semiconductor field effect transistor) element.

6. In paragraph 4, The above optical switch is a charging device including a light-emitting element connected to the control unit, and a MOSFET (metal oxide semiconductor field effect transistor) element turned on by the light-emitting element.

7. In paragraph 6, A charging device in which one end of the above MOSFET element is connected to the signal output section and the other end is connected to the charging module.

8. In paragraph 7, The other end of the above MOSFET element is a charging device connected to the CP (control pilot) line of the above charging module.

9. In paragraph 7, The above MOSFET element is a charging device comprising two N-channel FETs coupled in both directions.

10. In paragraph 7, A charging device in which one end of the light-emitting element is connected to the control unit and the other end is connected to ground through a resistor.

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