Charging apparatus for electric vehicle

Abstract

A charging apparatus for an electric vehicle, according to one embodiment of the present invention, comprises: a supply module for a supply mode in which a first pulse wide modulation (PWM) signal is transmitted to a power reception device; a charging module for a charging mode in which a second PWM signal is received from a power supply device; and a control unit that controls the supply module and the charging module, wherein the charging module includes a switching element, the charging device operates in the supply mode when the switching element is turned off, the charging device operates in the charging mode when the switching element is turned on, the supply module supports an AC supply mode and a DC supply mode, and the charging module supports an AC charging mode and a DC charging mode.

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 status.

[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] According to one embodiment of the present invention, a charging device for an electric vehicle includes a supply module for a supply mode that transmits a first PWM (Pulse Wide Modulation) signal to a power receiving device, a charging module for a charging mode that receives a second PWM signal from a power supply device, and a control unit that controls the supply module and the charging module, wherein the charging module includes a switching element, and when the switching element is turned off, the charging device operates in the supply mode, and when the switching element is turned on, the charging device operates in the charging mode, the supply module supports an AC supply mode and a DC supply mode, and the charging module supports an AC charging mode and a DC charging mode.

[0008] The device further includes a PLC (power line communication) communication unit, and in the DC supply mode, the PLC communication unit is set to communicate with the power receiving device, and in the DC charging mode, the PLC communication unit can be set to communicate with the power supply device.

[0009] The above PLC communication unit can be connected to the supply module and the charging module.

[0010] The charging module further includes a distribution resistor for distributing the voltage of the second PWM signal, and the distribution resistor can be connected in series with the switching element.

[0011] The charging module may further include a duty and voltage detection unit, wherein the duty and voltage detection unit may be set to detect the duty and voltage of the first PWM signal when the switching element is turned off, and may be set to detect the duty and voltage of the second PWM signal when the switching element is turned on.

[0012] The above duty and voltage detection unit may include a duty detection unit that detects the duty of the first PWM signal or the second PWM signal, a positive voltage detection unit that detects the positive voltage of the first PWM signal or the second PWM signal, and a negative voltage detection unit that detects the negative voltage of the first PWM signal or the second PWM signal.

[0013] The device further includes a proximity signal detection unit that detects a proximity detection signal, and the proximity signal detection unit can be set to detect a proximity detection signal of the power supply device in the charging mode.

[0014] The above proximity signal detection unit may be set to further detect a proximity detection signal of the power receiving device in the above supply mode.

[0015] It can support CCS1 (combined charging system 1) standard and CCS2 (combined charging system 2) standard.

[0016] The device may further include a connection unit connected to the power receiving device or the power supply device, wherein the connection unit may include a first line through which the first PWM signal or the second PWM signal is transmitted and a second line through which the proximity detection signal of the power receiving device or the proximity detection signal of the power transmitting device is transmitted.

[0017] The first line and the second line can be branched to the supply module and the charging module, respectively.

[0018] The on / off of the above switching element can be controlled by the control unit.

[0019] 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.

[0020] FIGS. 1 and 2 are drawings showing a charging system for an electric vehicle according to one embodiment of the present invention.

[0021] Figures 3 and 4 are examples of electrical equivalent circuits for charging between an EVSE and an EV.

[0022] Figure 5 shows a CP signal in PWM form output by EVSE.

[0023] Figures 6 to 8 are block diagrams of a charging system according to one embodiment of the present invention.

[0024] Figures 9 to 11 are circuit diagrams of a charging device according to an embodiment of the present invention.

[0025] FIG. 12 and FIG. 13 are drawings for explaining the operation of a charging device according to an embodiment of the present invention.

[0026] Figure 14 is a circuit diagram of a charging device according to an embodiment of the present invention when it operates in AC supply mode.

[0027] FIG. 15 is a circuit diagram of a charging device according to one embodiment of the present invention when it operates in DC supply mode.

[0028] FIG. 16 is a circuit diagram of a charging device according to one embodiment of the present invention when it operates in AC charging mode or DC charging mode.

[0029] Figure 17 is a schematic diagram of the connection relationship between an EVSE and an EV that follows the CCS1 (combined charging system 1) standard.

[0030] Figure 18 is a schematic diagram of the connection relationship between an EVSE and an EV that follows the CCS2 (combined charging system 2) standard.

[0031] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Additionally, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] FIGS. 1 and 2 are drawings showing a charging system for an electric vehicle according to one embodiment of the present invention.

[0042] 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).

[0043] 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.

[0044] 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.

[0045] Here, the charging device (100) can communicate with the EV (10) and EVSE (20), respectively.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] In mode 2, mode 3 and mode 4, the CP function is performed through a CP circuit using PWM (pulse wide modulation).

[0050] Figures 3 and 4 are examples of electrical equivalent circuits for charging between an EVSE and an EV.

[0051] 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 resistor and a switch. The AC voltage generated by the oscillator is converted into a charging voltage and charged by utilizing the resistance difference between the EVSE (20) side circuit and the EV (10) side circuit. 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.

[0052] Figure 5 shows a CP signal in PWM form output by EVSE.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] In general, the charging device (100) detects the positive voltage, which is the maximum voltage, and the negative voltage, which is the minimum voltage, of the CP signal, and can determine the charging status between the EVSE (20) and the EV (10) based on the detected maximum voltage and minimum voltage.

[0058] According to an embodiment of the present invention, a charging device (100) mounted on an EV (10) includes both a supply module including a circuit for supplying power and a charging module including a circuit for receiving power. Accordingly, the charging device (100) according to an embodiment of the present invention may be referred to as a V2V charging device (100) or a charging device (100) supporting V2V charging.

[0059] Figures 6 to 8 are block diagrams of a charging system according to one embodiment of the present invention.

[0060] Referring to FIG. 6, a 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).

[0061] In this specification, the first mode for supplying power externally may be used interchangeably with the V2V (Vehicle to Vehicle) mode, the EVSE 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.

[0062] 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 the second mode, and can be changed to operate in the first mode by a user setting or a control unit (140). To this end, the charging device (100) must include a module that supports the EVSE (20) side function along with a module that supports the EV (10) side function of FIGS. 3 and 4.

[0063] Referring to FIG. 7, the charging device (100) includes a connection unit (110), a supply module (120), a charging module (130), and a control unit (140).

[0064] 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) and the EVSE (700) or between the first EV (600) 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).

[0065] 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 between the control unit (140) and 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).

[0066] Meanwhile, the supply module (120) supports a first mode for supplying power to the outside, i.e., V2V (Vehicle to Vehicle) mode, EVSE mode, or supply mode. To this end, the supply module (120) includes at least a portion 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 a second EV (800), which is a power receiving device. In the present specification, the supply module (120) may be used interchangeably with a V2V module or an EVSE module.

[0067] The charging module (130) supports a second mode, i.e., EV mode or charging mode, in which power is supplied from an external source. That is, the charging module (130) receives a second PWM (Pulse Wide Modulation) signal from an EVSE (700), which is a power supply device, or a second EV (800). In this specification, the charging module (130) may be used interchangeably with the EV module.

[0068] The supply module (120) and the charging module (130) may be selectively driven. For example, when the charging device (100) operates in a first mode in which it supplies power to an external power receiving device, the supply module (120) may be activated, and when the charging device (100) operates in a second mode in which it receives power from an external power supply device, the charging module (130) may be activated. When the supply module (120) is activated, at least some functions of the charging module (130) may be deactivated, and when the charging module (130) is activated, at least some functions of the supply module (120) may be deactivated. For example, when the charging module (130) is activated, the first PWM signal generating function of the supply module (120) may 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).

[0069] 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.

[0070] Referring to FIG. 8, the charging device (100) may further include a PMIC (power management integration chip, 150). The PMIC (150) is connected to the supply module (120) and may control the generation of the first PWM signal of the supply module (120). In addition, the charging device (100) may further include a communication unit (160). The communication unit (160) may be a PLC communication unit that performs PLC communication. The communication unit (160) may be connected to the supply module (120) and the charging module (130) through the control unit (140), or may be directly connected to the supply module (120) and the charging module (130). Accordingly, the communication unit (160) may perform PLC communication with an external power receiving device in a supply mode, and may perform PLC communication with an external power supply device in a charging mode.

[0071] FIGS. 9 to 11 are circuit diagrams of a charging device according to an embodiment of the present invention, and FIGS. 12 and 13 are drawings for explaining the operation of a charging device according to an embodiment of the present invention.

[0072] Referring to FIGS. 9 to 11, the supply module (120) includes a first circuit that implements a supply mode, the charging module (130) includes a second circuit that implements a charging mode, and the first circuit and the second circuit can be implemented on one substrate.

[0073] The first circuit of the supply module (120) includes an oscillator (OSC) and a first resistor (R1) that are connected in series. The size of the first resistor (R1) may be smaller than the sizes of the second resistor (R2) and the third resistor (R3) included in the second circuit of the charging module (130). For example, the size of the first resistor (R1) may be 1 kΩ. The oscillator (OSC) may generate an AC voltage using a voltage input from a power source. In the present specification, the oscillator (OSC) may be used interchangeably with a PWM generator or an oscillator.

[0074] The second circuit of the charging module (130) includes a second resistor (R2) and a first switching element (S1) that are connected in series, and a third resistor (R3) and a second switching element (S2) that are connected in series, and the second resistor (R2) and the first switching element (S1) and the third resistor (R3) and the second switching element (S2) can be connected in parallel. The first switching element (S1) and the second switching element (S2) can be transistors. For example, the first switching element (S1) and the second switching element (S2) can be FETs (field effect transistors). For example, the first switching element (S1) and the second switching element (S2) can be MOSFETs.

[0075] The charging module (130) may further include a capacitor (Cv) connected in parallel to the second resistor (R2) and the first switching element (S1), and a diode (D) connected between the second resistor (R2) or the first switching element (S1) and the capacitor (Cv).

[0076] Here, the second resistor (R2) may be larger than the third resistor (R3). For example, the second resistor (R2) may be 2.74 kΩ, and the third resistor (R3) may be 1.3 kΩ or 270 Ω.

[0077] The second resistor (R2) is a distribution resistor that distributes the voltage of the CP signal, i.e., the second PWM signal, received from an external power supply.

[0078] According to an embodiment of the present invention, the voltage of the second PWM signal can be controlled by turning on or off the first switching element (S1) and the second switching element (S2). For example, when the first switching element (S1) is turned on and the second switching element (S2) is turned off, the voltage of the second PWM signal can be 9 V, and when the first switching element (S1) is turned on and the second switching element (S2) is turned on, the voltage of the second PWM signal can be 6 V.

[0079] Referring to FIG. 10, the charging module (130) may include a duty and voltage detection unit that detects the duty and voltage of the CP signal. The duty and voltage detection unit includes a duty detection unit that detects the duty of the CP signal, a positive voltage detection unit that detects the positive voltage of the CP signal, and a negative voltage detection unit that detects the negative voltage of the CP signal. The duty detection unit, the positive voltage detection unit, and the negative voltage detection unit are connected to the control unit (140) and may transmit a detection value 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, the positive voltage detection unit, and the negative voltage detection unit may be implemented by a monitoring resistor (Rm) and a monitoring capacitor (Cm), as described in FIG. 4. According to an embodiment of the present invention, by on / off control of the first switching element (S1) included in the charging module (130), the duty and voltage detection unit included in the charging module (130) can detect not only the duty and voltage of the second PWM signal transmitted from an external power supply device to the charging module (130), but also the duty and voltage of the first PWM signal generated by the supply module (120) and transmitted to the external power receiving device.

[0080] Referring again to FIGS. 9 to 11, the supply module (120) and the charging module (130) may include a connection terminal (AB) that is connected to another vehicle (e.g., 800) or an EVSE (e.g., 700). The connection terminal (AB) may refer to an inlet of the vehicle. A communication unit (160) may be connected to the connection terminal (AB). Here, the communication unit (160) may be a PCL (power line communication) communication unit and may perform CAN communication. The communication unit (160) may be connected to a second point (p2) and a third point (p3), which are both ends of a capacitor (Cv) of the charging module (130).

[0081] According to an embodiment of the present invention, the supply module (120) can be connected to a first point (p1) where the capacitor (Cv) and the diode (D) of the charging module (130) are connected and a third point (p3) where the communication unit (160) is connected. Accordingly, the communication unit (160) can be connected to the supply module (120) and the charging module (130), the supply module (120) and the charging module (130) can share the communication unit (160), and the supply module (120) and the charging module (130) can share the capacitor (Cv).

[0082] Accordingly, since the communication unit (160) supports not only the charging module (130) of the charging device (100) but also the supply module (120), the unit cost of the circuit constituting the charging device (100) can be reduced. The first point (p1) and the second point (p2) are described separately for convenience, but they may also refer to the same point on the circuit.

[0083] Referring to Fig. 11, the first circuit of the supply module (120) and the second circuit of the charging module (130) may be connected to one connection terminal (AB). The first circuit of the supply module (120) may include a capacitor (Cs) connected in parallel with an oscillator (OSC), and a first resistor (R1) connected between the oscillator (OSC) and the capacitor (Cs). That is, the first circuit of the supply module (120) and the second circuit of the charging module (130) may each individually include a capacitor. Although there is a difference in configuration between the circuit diagrams of Figs. 9 and 10 and the circuit diagram of Fig. 11, the operation according to the charging mode may be the same.

[0084] Meanwhile, referring to FIGS. 12 and 13, the control unit (140) controls the operation of the power supply, the oscillator (OSC), and the first switching element (S1). In particular, the control unit (140) controls the on / off of the first switching element (S1), and the charging device (100) operates in a supply mode or a charging mode depending on the on / off of the first switching element (S1).

[0085] That is, the PMIC (power management integrated circuit, 150) can apply V1 to the power supply, and the power supply can apply the transformed direct current V2 to the oscillator (OSC). The oscillator (OSC) can convert the direct current V2 into alternating current V2 and output it to another vehicle. Here, V1 can be 3.3 V and V2 can be 12 V. At this time, the on or off of the power supply and the oscillator (OSC) can be controlled by the control unit (140). Since the voltage charged from the EVSE and the voltage charged from the vehicle are the same when viewed from another vehicle, the other vehicle can recognize the charging from the EVSE and the charging from the vehicle as the same.

[0086] More specifically, as illustrated in FIG. 12, when the power and oscillator (OSC) are turned off and the first switching element (S1) is turned on, the charging device (100) operates in a charging mode in which it receives power from an external power supply device, and the duty and voltage detection unit of the charging module (130) detects the duty and voltage of the second PWM signal, which is a CP signal received from the external power supply device, and can determine whether the charging mode is operating normally based on the detected duty and voltage.

[0087] Alternatively, as illustrated in FIG. 13, when the power and oscillator (OSC) are turned on and the first switching element (S1) is turned off, the charging device (100) operates in a supply mode that supplies power to an external power receiving device, and the duty and voltage detection unit of the charging module (130) detects the duty and voltage of the first PWM signal, which is a CP signal generated by the supply module (120) and transmitted to the external power receiving device, and can determine whether the supply mode is operating normally based on the detected duty and voltage.

[0088] Here, whether the control unit (140) turns the first switching element (S1) on or off may depend on user settings. Alternatively, whether the control unit (140) turns the first switching element (S1) on or off may depend on the type of object connected to the vehicle inlet.

[0089] According to an embodiment of the present invention, the supply module (120) of the charging device (100) supports AC supply mode and DC supply mode, and the charging module (130) of the charging device (100) supports AC charging mode and DC charging mode.

[0090] Fig. 14 is a circuit diagram of a charging device according to an embodiment of the present invention when it operates in AC supply mode, Fig. 15 is a circuit diagram of a charging device according to an embodiment of the present invention when it operates in DC supply mode, and Fig. 16 is a circuit diagram of a charging device according to an embodiment of the present invention when it operates in AC charging mode or DC charging mode. Fig. 17 is a schematic diagram of a connection relationship between an EVSE and an EV that conform to the CCS1 (combined charging system 1) standard, and Fig. 18 is a schematic diagram of a connection relationship between an EVSE and an EV that conform to the CCS2 (combined charging system 2) standard.

[0091] Referring to FIGS. 14 to 16, a charging device according to an embodiment of the present invention includes a supply module (120) and a charging module (130). Duplicate descriptions of the same contents as those described with reference to FIGS. 6 to 8 and with reference to FIGS. 9 to 13 regarding the supply module (120) and the charging module (130) will be omitted.

[0092] According to an embodiment of the present invention, the charging module (130) includes a first switching element (S1) connected in series to a second resistor (R2). When the first switching element (S1) is turned off, the charging device (100) operates in a supply mode, and when the first switching element (S1) is turned on, the charging device (100) operates in a charging mode. According to an embodiment of the present invention, the supply module (120) of the charging device (100) supports an AC supply mode and a DC supply mode, and the charging module (130) of the charging device (100) supports an AC charging mode and a DC charging mode.

[0093] The charging device (100) according to an embodiment of the present invention can support the combined charging system 1 (CCS1) standard and the combined charging system 2 (CCS2) standard. The connection terminal (AB) of the charging device (100) according to an embodiment of the present invention includes a CP (control pilot) line through which a control pilot signal is transmitted and received and a PD (proximity detection) line through which a connector proximity detection signal is transmitted and received. The connection terminal (AB) of the charging device (100) according to an embodiment of the present invention may further include a PE line. The CP line and the PD line may be branched to a supply module (120) and a charging module (130), respectively.

[0094] That is, the supply module (120) and the charging module (130) of the charging device (100) can share the CP line. In the supply mode, the first PWM signal generated by the supply module (120) can be transmitted to the outside through the CP line. In the charging mode, the second PWM signal received from the outside can be transmitted to the charging module (130) through the CP line. Similarly, the supply module (120) and the charging module (130) of the charging device (100) can share the PD line.

[0095] Referring to Fig. 14, the charging device (100) according to the embodiment of the present invention operates in AC supply mode, and for this purpose, is connected to the charging module of another vehicle (800). Accordingly, a first PWM signal is output to the other vehicle (800) through the CP line of the supply module (120), the first switching element (S1) of the charging module (130) is turned off, and the duty and voltage detection unit (132) of the charging module (130) detects the duty and voltage of the first PWM signal. Meanwhile, the proximity signal detection unit (122) included in the supply module (120) continuously monitors the proximity detection signal by the connector connection with the other vehicle (800). As illustrated in Fig. 17, in the CCS1 standard, it is mandatory to detect the proximity detection signal on both the EVSE side and the EV side, and as illustrated in Fig. 18, in the CCS2 standard, detecting the proximity signal on the EVSE side is optional. As in the embodiment of the present invention, when the proximity signal detection unit (122) of the supply module (120) continuously monitors the proximity detection signal, both the CCS1 standard and the CCS2 standard can be supported. That is, it can be seen that the supply module (120) according to FIG. 14 can operate in the same manner as the circuit diagram of the CCS1 standard illustrated in FIG. 17 and the circuit diagram of the CCS2 standard illustrated in FIG. 18.

[0096] Referring to FIG. 15, the charging device (100) according to the embodiment of the present invention operates in a DC supply mode, and for this purpose, is connected to a charging module of another vehicle (800). Accordingly, a first PWM signal is output to the other vehicle (800) through the CP line of the supply module (120), the first switching element (S1) of the charging module (130) is turned off, and the duty and voltage detection unit (132) of the charging module (130) detects the duty and voltage of the first PWM signal. Meanwhile, in order to operate in the DC supply mode, the supply module (120) of the charging device (100) must be connected to a communication unit (160) that supports PLC communication. According to the embodiment of the present invention, the communication unit (160) is connected not only to the charging module (130) but also to the supply module (120), so that the supply module (120) can perform PLC communication with the other vehicle (800). In addition, the proximity signal detection unit (122) of the supply module (120) continuously monitors the proximity detection signal by the connector connection with another vehicle (800). As illustrated in FIG. 17, in the CCS1 standard, it is mandatory to detect the proximity detection signal on both the EVSE side and the EV side, and as illustrated in FIG. 18, in the CCS2 standard, it is optional to detect the proximity signal on the EVSE side. In the embodiment of the present invention, when the proximity signal detection unit (122) of the supply module (120) continuously monitors the proximity detection signal, both the CCS1 standard and the CCS2 standard can be supported. That is, it can be seen that the supply module (120) according to FIG. 15 can operate in the same manner as the circuit diagram of the CCS1 standard illustrated in FIG. 17 and the circuit diagram of the CCS2 standard illustrated in FIG. 18.

[0097] Referring to Fig. 16, a charging device (100) according to an embodiment of the present invention operates in an AC charging mode or a DC charging mode, and for this purpose is connected to a supply module of another vehicle (800) or an EVSE (700). Accordingly, a second PWM signal is received through a CP line of the charging module (130), a first switching element (S1) of the charging module (130) is turned on, and a duty and voltage detection unit (132) of the charging module (130) detects the duty and voltage of the second PWM signal.

[0098] In addition, the proximity signal detection unit (122) of the supply module (120) continuously monitors the proximity detection signal by the connector connection with the supply module of another vehicle (800) or the EVSE (700). Referring to FIG. 17, in the CCS1 standard, it is mandatory to detect the proximity signal on both the EVSE side and the EV side, and referring to FIG. 18, in the CCS2 standard, it is mandatory to detect the proximity signal on the EV side. As in the embodiment of the present invention, the PD line of the supply module (120) and the PD line of the charging module (130) are connected to each other, and in the charging mode, the proximity detection signal by the connector connection with the supply module of another vehicle (800) or the EVSE (700) can be continuously monitored through the proximity signal detection unit (122) connected to the PD line of the supply module (120).

[0099] Meanwhile, in order to operate in DC charging mode, the charging module (130) of the charging device (100) is connected to a communication unit (160) that supports PLC communication and can perform PLC communication with another vehicle (800) or EVSE (700).

[0100] In this way, the charging device (100) according to the embodiment of the present invention can support both a supply mode for supplying power to the outside and a charging mode for receiving power from the outside by controlling the on / off of the first switching element (S1) included in the charging module (130). In addition, the charging device (100) according to the embodiment of the present invention can satisfy both the requirements of the CCS1 standard and the CCS2 standard while supporting both the supply mode and the charging mode. In addition, since the charging device (100) according to the embodiment of the present invention uses an integrated duty and voltage detection unit when operating in the supply mode and when operating in the charging mode, it is possible to reduce the cost, size, and complexity of the charging device (100). Similarly, since the charging device (100) according to the embodiment of the present invention uses an integrated communication unit and an integrated proximity signal detection unit when operating in the supply mode and when operating in the charging mode, it is possible to reduce the cost, size, and complexity of the charging device (100). That is, according to an embodiment of the present invention, both a supply module (120) for supplying power to the outside and a charging module (130) for receiving power from the outside are included in the charging device (100), and the duty and voltage detection unit, the proximity signal detection unit, and the communication unit are commonly applied to the supply module (120) and the charging module (130), so that it is possible to reduce the cost, size, and complexity of the charging device (100).

[0101] 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.

[0102] [Explanation of symbols]

[0103] 10: Electric cars

[0104] 20: Electric vehicle charging facilities

[0105] 22: Charging cable

[0106] 100: Charging device

[0107] 110: Connector

[0108] 120: Supply module

[0109] 130: Charging module

[0110] 140: Control Unit

Claims

1. In a charging device for an electric vehicle, A supply module for a supply mode that transmits a first PWM (Pulse Wide Modulation) signal to a power receiving device, A charging module for a charging mode that receives a second PWM signal from a power supply, and It includes a control unit that controls the supply module and the charging module, The charging module includes a switching element, and when the switching element is turned off, the charging device operates in the supply mode, and when the switching element is turned on, the charging device operates in the charging mode. The above supply module supports AC supply mode and DC supply mode, and the above charging module is a charging device that supports AC charging mode and DC charging mode.

2. In paragraph 1, It further includes a PLC (power line communication) communication unit, A charging device wherein, in the DC supply mode, the PLC communication unit is set to communicate with the power receiving device, and in the DC charging mode, the PLC communication unit is set to communicate with the power supply device.

3. In paragraph 2, The above PLC communication unit is a charging device connected to the supply module and the charging module.

4. In paragraph 2, The charging module further includes a distribution resistor for distributing the voltage of the second PWM signal, and the distribution resistor is a charging device connected in series with the switching element.

5. In paragraph 1, The above charging module further includes a duty and voltage detection unit, A charging device wherein the duty and voltage detection unit is set to detect the duty and voltage of the first PWM signal when the switching element is turned off, and is set to detect the duty and voltage of the second PWM signal when the switching element is turned on.

6. In paragraph 5, A charging device in which the duty and voltage detection unit includes a duty detection unit that detects the duty of the first PWM signal or the second PWM signal, a positive voltage detection unit that detects the positive voltage of the first PWM signal or the second PWM signal, and a negative voltage detection unit that detects the negative voltage of the first PWM signal or the second PWM signal.

7. In paragraph 1, Further comprising a proximity signal detection unit for detecting a proximity detection signal, A charging device wherein the proximity signal detection unit is set to detect a proximity detection signal of the power supply device in the charging mode.

8. In paragraph 7, A charging device wherein the proximity signal detection unit is set to further detect a proximity detection signal of the power receiving device in the supply mode.

9. In paragraph 1, A charging device that supports the CCS1 (combined charging system 1) standard and the CCS2 (combined charging system 2) standard.

10. In paragraph 1, Further comprising a connection part connected to the power receiving device or the power supply device, A charging device, wherein the connecting portion includes a first line through which the first PWM signal or the second PWM signal is transmitted and a second line through which the proximity detection signal of the power receiving device or the proximity detection signal of the power transmitting device is transmitted.

Images