Charging device for an electric vehicle

Abstract

A charging device for an electric vehicle according to an embodiment of the present invention includes: a power supply module in a first mode for transmitting a first pulse width modulation (PWM) signal to the outside; a charging module in a second mode for receiving a second PWM signal from the outside; and a control unit for controlling the power supply module and the charging module, wherein the charging module includes a first line for receiving a connector proximity detection signal and a second line for receiving a control guidance signal, and the power supply module includes a signal output unit for outputting the first PWM signal, a resistor unit disposed between the signal output unit and the second line, and a leakage current blocking unit disposed between the signal output unit and the resistor unit.

Description

Technical Field

[0001] This invention relates to electric vehicles, and more particularly to the charging of electric vehicles. Background Technology

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

[0003] For EV charging, the EV and EVSE communicate via a charging connector connected between the EVSE and the EV. Charging begins after charging signaling exchanges occur between the EVSE and the EV when the charging connector is connected.

[0004] The control lead (CP) pin is located in the charging connector, and a pulse-width modulated (PWM) CP signal is transmitted from the EVSE to the EV through this pin. The interaction between the EVSE and the EV can be monitored and controlled via the CP signal, and the voltage amplitude of the CP signal may vary for each charging state. Therefore, the EV charging device must detect the voltage amplitude of the CP signal. The EV charging device requires a method to accurately and efficiently detect the voltage amplitude of the CP signal.

[0005] Furthermore, not only does building charging infrastructure such as EVSE require significant time, space, and cost, but charging EVs via EVSE also takes considerable time, thus hindering the commercialization of EVs. Technologies are needed to address these issues and support vehicle-to-vehicle (V2V) charging. Summary of the Invention Technical issues

[0006] The technical problem to be solved by the present invention is to provide a charging device for charging electric vehicles (EVs). Technical solution

[0007] A charging device for an electric vehicle according to an embodiment of the present invention includes: a power supply module in a first mode for transmitting a first pulse width modulation (PWM) signal to the outside; a charging module in a second mode for receiving a second PWM signal from the outside; and a controller for controlling the power supply module and the charging module, wherein the charging module includes a first line for receiving a connector proximity detection signal and a second line for receiving a control guidance signal, and the power supply module includes a signal output unit for outputting the first PWM signal, a resistor unit disposed between the signal output unit and the second line, and a leakage current blocking unit disposed between the signal output unit and the resistor unit.

[0008] The leakage current blocking unit may include a diode and can block the flow of current from the resistor unit toward the signal output unit.

[0009] A resistor unit may include a 1kΩ resistor.

[0010] The signal output unit may include a power enhancement integrated chip (IC).

[0011] The signal output unit may include: a comparator that compares the voltage value of the pulse signal generated by the controller with a reference value; a first power supply unit connected to a first terminal of the comparator; a first switch connected to the first power supply unit; a second power supply unit connected to a second terminal of the comparator; and a second switch connected to the second power supply unit, wherein the first switch and the second switch may be turned on alternately according to the comparison result of the comparator.

[0012] The first power supply unit can supply +12V±0.6V, and the second power supply unit can supply -12V±0.6V.

[0013] The leakage current blocking unit may include a first diode disposed between the first switch and the resistor unit and a second diode disposed between the second switch and the resistor unit, wherein the first diode may be configured to conduct in the direction from the first switch toward the resistor unit, and the second diode may be configured to conduct in the direction from the second switch toward the resistor unit.

[0014] The charging module may include a detector that detects at least one of the duty cycle and voltage of the second PWM signal.

[0015] The detector can be connected to the power supply module and can also detect at least one of the duty cycle and voltage of the first PWM signal.

[0016] The leakage current blocking unit can prevent the second PWM signal from leaking to the power supply module.

[0017] The leakage current blocking unit can prevent the second PWM signal from leaking to the power supply module in the sleep mode of the charging device.

[0018] The charging device can be operated in either the first or second mode via the controller. Beneficial effects

[0019] According to embodiments of the present invention, a charging device can be provided that can operate not only in a charging mode that supplies power to an EV from an external source, but also in a power supply mode that supplies power from one EV to another. In particular, according to embodiments of the present invention, a charging device can be provided that supports both charging and power supply modes without significantly increasing cost and size, and that enables accurate status detection, thereby achieving high reliability. Attached Figure Description

[0020] Figures 1 to 2 This is a view illustrating a charging system for an electric vehicle according to an embodiment of the present invention.

[0021] Figures 3 to 4 This is an example of an equivalent circuit for charging between EVSE and EV.

[0022] Figure 5 The CP signal in PWM form output from EVSE is shown.

[0023] Figures 6 to 7 This is a block diagram of a charging system according to an embodiment of the present invention.

[0024] Figure 8 This is a block diagram of a charging module of a charging device in a charging system according to an embodiment of the present invention.

[0025] Figure 9 This is a charging device included in a charging system according to an embodiment of the present invention.

[0026] Figure 10 It includes Figure 9 An example of a charging system for a charging device.

[0027] Figure 11 This is an example of a charging system according to an embodiment of the present invention applied to the DIN70121 standard.

[0028] Figure 12 It is the waveform of the CP signal that should be detected on the EV side in sleep mode.

[0029] Figure 13 It is the waveform of the CP signal actually detected on the EV side in both V2V mode and EV mode during sleep mode.

[0030] Figure 14 It is the waveform of the CP signal detected in sleep mode on the EV side equipped with a charging device according to an embodiment of the present invention. Detailed Implementation

[0031] Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0032] However, the spirit of the present invention is not limited to the described embodiments, but can be implemented in various different forms, and within the spirit of the present invention, one or more components can be selectively combined or substituted between embodiments.

[0033] Furthermore, unless explicitly and specifically defined and described, the terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted as meanings commonly understood by those skilled in the art, and the meanings of commonly used terms, such as terms defined in dictionaries, may be understood in the context of the relevant art.

[0034] Furthermore, the terminology used in the embodiments of the present invention is provided not to limit the invention but to describe the embodiments.

[0035] In this specification, unless otherwise indicated in the phrase, the singular form may also include the plural form, and when disclosed as “at least one (or one or more) of A, B and C”, it may include one or more of all possible combinations of A, B and C.

[0036] Furthermore, terms such as first, second, A, B, (a), (b) can be used to describe components of embodiments of the present invention.

[0037] These terms are provided only to distinguish components from one another, and such terms do not limit the nature, order, sequence, etc. of the components.

[0038] Additionally, when a particular component is disclosed as being “connected,” “coupled,” or “linked” to another component, this may include not only cases where the component is directly connected, coupled, or linked to the other component, but also cases where the component is connected, coupled, or linked to the other component through another component between the component and the other component.

[0039] Furthermore, when a component is disclosed as being "above" or "below" another component, the term "above or below" includes both the case where the two components are in direct contact with each other and the case where at least one other component is being formed or disposed between the two components. Additionally, when expressed as "above or below," based on a single component, it can include not only the meaning of an upward direction but also the meaning of a downward direction.

[0040] The embodiments will now be described in detail with reference to the accompanying drawings, and regardless of the reference numerals, the same or corresponding components will be indicated by the same reference numerals, and repeated descriptions thereof will be omitted.

[0041] Figures 1 to 2 This is a view illustrating a charging system for an electric vehicle according to an embodiment of the present invention.

[0042] refer to Figures 1 to 2The electric vehicle (EV) 10 can be charged via the electric vehicle power supply equipment (EVSE) 20. In this specification, the EV 10 is a vehicle driven by an electric motor that draws current from a rechargeable battery or other portable energy storage device. This specification is based on the EV 10, but it is clearly applicable also to plug-in hybrid electric vehicles (PHEVs).

[0043] For this purpose, the charging cable 22 connected to the EVSE 20 can be connected to the inlet of the EV 10. Here, the EVSE 20 is an AC or DC power supply device that can be installed at a charging station or in a home, and can also be made portable. The EVSE 20 is interchangeable with power supplies, AC power supplies, DC power supplies, sockets, etc.

[0044] The charging device (electric vehicle charging controller, EVCC) 100 is installed in and connected to the EV 10. For example, the charging device 100 may be installed in the trunk of the EV 10, but is not limited thereto.

[0045] Here, the charging device 100 can communicate with each of the EV 10 and EVSE 20.

[0046] The methods for connecting EV 10 to EVSE 20 can be divided into four modes and three cases. Mode 1 connects EV 10 to the AC power network using a plug and cable connected to a standard socket. Mode 2 connects EV 10 to the AC power network using a plug and cable connected to a standard socket with a protection system and CP function to prevent electric shock between the EV and the socket. Mode 3 connects EV 10 to EVSE 20 permanently connected to the AC power network, and the CP function extends to the controls in EVSE 20. Mode 4 connects EV 10 to the AC or DC power network using a DC EVSE or DC EV charging station that utilizes the CP function. Case A connects EV 10 to AC power using a cable and plug assembly permanently attached to the EV. Case B connects EV 10 to the power source using a cable assembly with detachable ends. Case C connects EV 10 to the power source using a vehicle connector and power cable permanently attached to the EV charging station.

[0047] In the cable assembly between EV 10 and EVSE 20, the CP conductor, which forms the insulated conductor of the CP circuit, can be placed together with the protective conductor (PE). Here, the CP circuit is designed for signal transmission or communication between EV 10 and EVSE 20, and the CP function can be used to monitor and control the interaction between EV 10 and EVSE 20. A CPF controller (Control Guidance Function Controller), which manages the CP signal and CP function, can be provided in EVSE 20. The proximity function can be an electrical or mechanical device indicating the status of the connector being inserted into the inlet of EV 10 or the status of the plug of the socket being inserted into the charging station.

[0048] In modes 2, 3, and 4, EVSE 20 performs the following functions: continuously checks the continuity of the protective grounding conductor, verifies that EV 10 is properly connected to EVSE 20, supplies power to EV 10, stops supplying power to EV 10, and transmits maximum current information. Here, in order to supply power to EV 10, the CP function between EVSE 20 and EV 10 must be accurately set to the signal state that allows power supply.

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

[0050] Figures 3 to 4 This is an example of the electrical equivalent circuit for charging between the EVSE and the EV.

[0051] refer to Figures 3 to 4 EVSE 20 includes an oscillator that generates an AC voltage for charging, and EV 10 includes a resistor and a switch. Here, Va is the lead-in voltage measured at the output terminal of EVSE 20, Vg is the internal voltage of the oscillator, and Vb is the voltage, duty cycle, and frequency measured by EV 10. EVSE 20 communicates by setting the duty cycle of a PWM signal or a continuous DC voltage signal. EVSE 20 can change the duty cycle of the PWM signal. EV 10 responds by applying a positive half-wave to the CP circuit using a resistive load. When EV 10 senses a current higher than the CP function (duty cycle), EVSE 20 can disconnect its switching mechanism. In this case, EVSE 20 will follow the following conditions: the allowable response time of EV 10, the current tolerance relative to the duty cycle generated by EVSE 20, and the current measurement tolerance of EVSE 20 itself. The amplitude of the battery charging voltage can be controlled by the on and off states of the switch connected to the resistor on the EV 10 side.

[0052] Figure 5 The CP signal in PWM form output from EVSE is shown.

[0053] refer to Figure 5 The EVSE 20 outputs a PWM-type CP signal with a maximum voltage of +12V and a minimum voltage of -12V. The EV 10's charging device 100 detects the duty cycle and voltage amplitude of the CP signal to monitor and control its status.

[0054] The CP signal state can be categorized into states A, B, C, D, E, and F. State A refers to the charger being disconnected between EVSE 20 and EV 10, i.e., not plugged in, and is defined as state A when the peak value of the CP signal is +12V±1V. State B refers to the charger being connected between EVSE 20 and EV 10, i.e., plugged in, and can also refer to the charging preparation state. State B is defined as the maximum voltage of the CP signal being +9V±1V and the minimum voltage being -12V±1V. States C and D refer to the charging state, i.e., the charging state, and specifically, state D can refer to the state where ventilation is required during charging. State C is defined as the maximum voltage of the CP signal being +6V±1V and its minimum voltage being -12V±1V, while state D is defined as the maximum voltage of the CP signal being +3V±1V and its minimum voltage being -12V±1V. States E and F can indicate error states. For example, state E indicates that EVSE 20 is not powered, and state F indicates that EVSE 20 is unavailable. When the maximum voltage of the CP signal is +0V±1V and its minimum voltage is -12V±1V, the state is determined to be state E, while when the maximum voltage of the CP signal is -12V±1V and its minimum voltage is -12V±1V, the state is determined to be state F.

[0055] Meanwhile, sleep mode is an energy-saving mode. EV 10 and EVSE 20 can enter sleep mode after a pause negotiated via the HLC protocol. On the EVSE 20 side, sleep mode means the oscillator is off, the +12V power supply to the leads is maintained, and power to the underlying communication module is disconnected. On the EV 10 side, sleep mode means state B, and power to the underlying communication module can be disconnected. A wake-up mechanism can also be used after the charging period has ended, allowing the peer station to reset the HLC.

[0056] The interaction between EVSE 20 and EV 10 can be monitored and controlled via the CP signal, and as mentioned above, the voltage amplitude of the CP signal can vary for each charging state. Therefore, the charging device 100 of EV 10 must accurately detect the voltage amplitude of the CP signal.

[0057] Generally, the charging device 100 detects each of the positive voltage (maximum voltage, CP signal) and the negative voltage (minimum voltage), and can determine the charging state between EVSE 20 and EV 10 based on the detected maximum and minimum voltages. According to an embodiment of the invention, the charging device 100 is designed to efficiently monitor the charging state between EVSE 20 and EV 10 based on the CP signal.

[0058] Figures 6 to 7 This is a block diagram of a charging system according to an embodiment of the present invention. Figure 8 This is a block diagram of a charging module of a charging device in a charging system according to an embodiment of the present invention.

[0059] refer to Figures 6 to 7 The first EV 600 can be connected to the EVSE 700, or it can be connected to the second EV 800, which is another EV. The first EV 600 can operate in a first mode of supplying power to an external source, or it can operate in a second mode of receiving power from an external source. For example, the first EV 600 can be connected to the EVSE 700 and operate in the second mode of receiving power from the EVSE 700. Alternatively, the first EV 600 can be connected to the second EV 800 and operate in a first mode of supplying power to the second EV 800, or it can operate in a second mode of receiving power from the second EV 800.

[0060] In this manual, the first mode of supplying power to an external source can be used interchangeably with the vehicle-to-vehicle (V2V) mode or the power supply mode. Furthermore, the second mode of supplying power from an external source can be used interchangeably with the EV mode or the charging mode.

[0061] Charging device 100 is installed in each of the first EV 600 and the second EV 800. Generally, charging device 100 is initially set to operate in the second mode and can be changed to operate in the first mode via user settings or a controller. For this purpose, charging device 100 should include support for... Figures 3 to 4 Modules supporting EVSE 20 side functionality and modules supporting EV 10 side functionality.

[0062] According to an embodiment of the present invention, the charging device 100 includes a connector unit 110, a power supply module 120, a charging module 130, and a controller 140. Since the embodiments of the present invention relate to methods and apparatus for detecting CP signals, for ease of description, the description will focus on matters related to CP signal detection of the charging device 100. For matters other than those related to CP signal detection, known techniques related to the charging device 100 can be applied.

[0063] The controller 140 controls the connector unit 110, the power supply module 120, and the charging module 130, and generates control signals for charging between the first EV 600, EVSE 700, and the second EV 800. The charging control signals generated by the controller 140 can be transmitted through the connector unit 110 to the EVSE 700 or the second EV 800, or to the ECU 610 in the first EV 600.

[0064] Connector unit 110 connects to EVSE 700 or the second EV 800 and transmits signals between controller 140 and EVSE 700 or the second EV 800. For example, connector unit 110 can transmit charging-related signals received from EVSE 700 or the second EV 800 to controller 140, and transmit charging control signals generated by controller 140 to EVSE 700 or the second EV 800. Furthermore, connector unit 110 can transmit power received from EVSE 700 or the second EV 800 to battery 620 in the first EV 600 according to the charging control signals generated by controller 140. Alternatively, connector unit 110 can transmit power to the second EV 800 according to the charging control signals generated by controller 140.

[0065] Simultaneously, the power supply module 120 supports a first mode of power supply to external sources, namely, vehicle-to-vehicle (V2V) mode or power supply mode. Therefore, the power supply module 120 includes at least... Figures 3 to 4 This is part of the functionality of the EVSE 20 side shown. Specifically, the power supply module 120 generates a first pulse width modulation (PWM) signal and transmits this first PWM signal to the second EV 800. The charging module 130 supports a second mode of external power supply, namely, EV mode or charging mode. That is, the charging module 130 receives a second pulse width modulation (PWM) signal from either the EVSE 700 or the second EV 800.

[0066] The power supply module 120 and the charging module 130 can be selectively driven. For example, the power supply module 120 can be activated when the charging device 100 operates in a first mode of supplying power to an external source, and the charging module 130 can be activated when the charging device 100 operates in a second mode of receiving power from an external source. When the power supply module 120 is activated, at least some functions of the charging module 130 are disabled; when the charging module 130 is activated, at least some functions of the power supply module 120 can be disabled. For example, when the charging module 130 is activated, the first PWM signal generation function of the power supply module 120 can be turned off. For example, the charging module 130 is initially set to be activated, and when the charging device 100 is ready to operate in the first mode, at least some functions of the charging module 130 are disabled, and the power supply module 120 can be activated by user settings or control of the controller 140. For example, the charging module 130 is initially set to be activated, and when the charging device 100 is ready to operate in the first mode, the power supply module 120 can also be activated by user settings or control of the controller 140.

[0067] Simultaneously, when the charging device 100 operates in the second mode, the connector unit 110 receives a control guidance (CP) signal in the form of pulse width modulation (PWM) from the EVSE 700 or the second EV 800. Here, the CP signal is a PWM signal with a predetermined duty cycle, and can be... Figure 5 As shown in the diagram. The CP signal is used to monitor and control the interaction between the first EV 600 and EVSE 700 or 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 PWM-form CP signal received from the EVSE 700 or the second EV 800, and can monitor the charging status and control charging accordingly.

[0068] refer to Figure 8 The charging module 130 includes a duty cycle detector 131 for detecting the duty cycle of the CP signal, a positive voltage detector 132 for detecting the positive voltage of the CP signal, and a negative voltage detector 133 for detecting the negative voltage of the CP signal. The duty cycle detector 131, positive voltage detector 132, and negative voltage detector 133 are connected to the controller 140 and can transmit the detected values ​​to the controller 140. Here, the positive voltage can be the maximum voltage of the CP signal in PWM form, i.e., the positive voltage peak, and the negative voltage can be the minimum voltage of the CP signal in PWM form, i.e., the negative voltage peak. Figure 4 As shown, the duty cycle detector 131, the positive voltage detector 132, and the negative voltage detector 133 can be implemented by the monitoring resistor (Rm) and the monitoring capacitor (Cm) on the EV 10 side.

[0069] Figure 9 This is a charging device included in a charging system according to an embodiment of the present invention. Figure 10 It includes Figure 9 An example of a charging system for a charging device.

[0070] refer to Figures 9 to 10 A charging system according to an embodiment of the present invention includes a charging device 100. The charging device 100 can be installed in an EV. When the charging device 100 is installed... Figures 6 to 7 In the first EV 600, the charging device 100 can be connected to Figures 6 to 7 The EVSE 700 or the second EV 800. Despite Figure 10 The diagram shows the charging device 100 connected to EVSE 700, but it is not limited to this; it can also be connected to a second EV 800. That is, the charging device 100 can be connected to EVSE 700 and operate in a second mode powered by EVSE 700. Alternatively, the charging device 100 can be connected to the second EV 800 and operate in a second mode powered by the second EV 800. Alternatively, the charging device 100 can be connected to the second EV 800 and operate in a first mode powering the second EV 800.

[0071] Therefore, the charging device 100 includes a power supply module 120 in a first mode for transmitting a first PWM signal to the outside and a charging module 130 in a second mode for receiving a second PWM signal from the outside. The charging module 130 includes a proximity detection (PD) line for receiving a connector proximity detection signal and a control guide (CP) line for receiving a control guide signal. Furthermore, the charging module 130 includes a duty cycle detector 131 for detecting the duty cycle of the CP signal, a positive voltage detector 132 for detecting the positive voltage of the CP signal, and a negative voltage detector 133 for detecting the negative voltage of the CP signal.

[0072] The duty cycle detector 131, positive voltage detector 132, and negative voltage detector 133 of the charging module 130 detect the duty cycle, positive voltage, and negative voltage of the CP signal (i.e., the second PWM signal) in the form of PWM received from the outside. Therefore, the charging status between the EVSE 700 or the second EV 800, which supplies power to the charging device 100, and the first EV 600 can be monitored.

[0073] In addition, the duty cycle detector 131, positive voltage detector 132 and negative voltage detector 133 of the charging module 130 detect the duty cycle, positive voltage and negative voltage of the CP signal (i.e. the first PWM signal) in the form of PWM transmitted to the outside by the power supply module 120. Therefore, when powering the second EV 800, the diagnostic fault codes (DTCs) of the charging device 100 in the first EV 600 can be monitored.

[0074] Therefore, the power supply module 120 can be connected to the CP line of the charging module 130.

[0075] According to an embodiment of the present invention, the power supply module 120 includes a signal output unit 121 that outputs a first PWM signal and a resistor unit 122 disposed between the signal output unit 121 and the CP line of the charging module 130. The resistor unit 122 may include a 1kΩ resistor. One end of the resistor unit 122 may be connected to the CP line of the charging module 130, and the other end of the resistor unit 122 may be connected to the signal output unit 121 of the power supply module 120.

[0076] According to an embodiment of the present invention, the signal output unit 121 of the power supply module 120 is connected to the controller 140. The signal output unit 121 may include a power enhancement integrated chip (IC). For example, the signal output unit 121 includes an oscillator (not shown), a comparator 121A, a +12V power supply, a -12V power supply, a first switch S1, and a second switch S2. Here, the first switch S1 and the second switch S2 may be transistors. Here, the first switch S1 and the second switch S2 may be field-effect transistors (FETs). The controller 140 is connected to the oscillator and controls the generation of the PWM signal. For example, the controller 140 may control the oscillator to generate a PWM signal with a duty cycle of 50% and an amplitude of 3V. The comparator 121A is connected to the oscillator and can compare the voltage value of the PWM signal generated by the oscillator with a reference value. In addition, the +12V power supply may be connected to the first terminal of the comparator 121A, and the -12V power supply may be connected to the second terminal of the comparator 121A. Here, the +12V power supply can be a power supply providing a voltage of +12V ± 0.6V, and the -12V power supply can be a power supply providing a voltage of -12V ± 0.6V. Meanwhile, as described above, the resistor unit 122 includes one end connected to the CP line of the charging module 130 and the other end connected to the signal output unit 121. A first switch S1 is disposed between the other end of the resistor unit 122 and the +12V power supply, and a second switch S2 is disposed between the other end of the resistor unit 122 and the -12V power supply. The first switch S1 and the second switch S2 are alternately turned on and off according to the comparison result of the comparator. Therefore, when the charging device 100 operates in the first mode, the signal output unit 121 of the power supply module 120 can output a ±12V first PWM signal according to the control of the controller 140. Therefore, the charging device 100 installed in the first EV 600 can perform the function of supplying power to another vehicle (EVSE).

[0077] Meanwhile, the charging device 100 according to an embodiment of the present invention operates in a first mode that transmits a first PWM signal to the outside or in a second mode that receives 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 via the CP line. When the charging device 100 according to an embodiment of the present invention supports both the first mode and the second mode, the power supply module 120 can also be connected to the CP line of the charging module 130 as described above. Therefore, current leakage may occur where a portion of the second PWM signal generated by the external EVSE 700 or the second EV 800 flows into the power supply module 120. In the second mode, when the charging module 130 detects a CP signal with a maximum voltage of +9V±1V and a minimum voltage of -12V±1V, it determines that it is in state B, which is a state in which the charger is connected and charging is ready to be performed between the EVSE and the EV. However, when the power supply module 120 experiences current leakage, the charging module 130 has difficulty accurately detecting the positive and negative voltages of the CP signal, and therefore may have difficulty accurately detecting the charging status.

[0078] According to an embodiment of the present invention, the power supply module 120 further includes a leakage current blocking unit 123 disposed between the signal output unit 121 and the resistor unit 122. The leakage current blocking unit 123 allows the first PWM signal to pass through in the direction from the signal output unit 121 toward the resistor unit 122, but prevents a portion of the second PWM signal generated by the external EVSE 700 or the second EV 800 from leaking into the power supply module 120.

[0079] For example, the leakage current blocking unit 123 includes a diode. The diode included in the leakage current blocking unit 123 can be configured to allow current to flow in the direction from the signal output unit 121 toward the resistor unit 122, while blocking current from flowing in the direction from the resistor unit 122 toward the signal output unit 121.

[0080] For example, the leakage current blocking unit 123 includes a first diode D1 and a second diode D2. The first diode D1 can be disposed between the other end of the resistor unit 122 and the first switch S1, and the second diode D2 can be disposed between the other end of the resistor unit 122 and the second switch S2. Here, the first diode D1 can be configured to conduct in the direction from the first switch S1 toward the resistor unit 122, and the second diode D2 can be configured to conduct in the direction from the second switch S2 toward the resistor unit 122. Therefore, the blocking current flows in the direction from the resistor unit 122 toward the signal output unit 121, and the charging device 100 operating in the second mode can accurately detect the CP signal.

[0081] Figure 11 This is an example of a charging system according to an embodiment of the present invention applied to the DIN70121 standard.

[0082] refer to Figure 11 Charging systems supporting the DIN70121 standard include the EV-side 1100 and the EVSE-side 1200. The EV-side 1100 can be... Figures 6 to 7 The first EV 600, the EVSE side 1200 can be Figures 6 to 7 The EVSE 700 or the second EV 800. According to an embodiment of the invention, the EV side 1100 may include a power supply module 1120 and a charging module 1130. The descriptions of the power supply module 1120 and the charging module 1130 can be found in the reference... Figures 9 to 10 The power supply module 120 and the charging module 130 are described in the same way.

[0083] In other words, the power supply module 120 includes a signal generation unit 121 and a resistor unit 122 for charging another EV, and also includes a leakage current blocking unit 123 disposed between the signal generation unit 121 and the resistor unit 122.

[0084] The resistor unit 122 of the power supply module 120 can be smaller than R2 and R3, which are resistors in the charging module 130. For example, the resistor unit 122 of the power supply module 120 can include a 1kΩ resistor. Although not shown, the power supply module 120 includes a power management integrated circuit (PMIC), and the voltages of the +12V and -12V power supplies can be applied by the PMIC to the pulse signal generated by the oscillator. Therefore, the EV can perform the same function as the EVSE.

[0085] Additionally, each of the EV side 1100 and the EVSE side 1200 may also include a communication unit. For example, the communication unit may be a PLC communication unit and may support CAN communication as a vehicle communication protocol. The PLC communication unit may be connected to both ends of a capacitor (Cv). Therefore, the PLC communication unit can be connected not only to the charging module 130 but also to the power supply module 120, and the power supply module 120 and the charging module 130 may share the PLC communication unit.

[0086] Figure 12 This is the waveform of the CP signal that should be detected on the EV side during sleep mode. Figure 13 It is the waveform of the CP signal actually detected on the EV side in sleep mode, supporting both V2V and EV modes. Figure 14 It is the waveform of the CP signal detected in sleep mode on the EV side equipped with a charging device according to an embodiment of the present invention.

[0087] refer to Figure 12 In sleep mode, the normal waveform of the CP signal that should be detected on the EV side is a PWM signal with a minimum voltage of -12V and a maximum voltage of +9V.

[0088] However, reference Figure 13 When both V2V and EV modes are supported, due to current leakage, the minimum voltage of the CP signal actually detected on the EV side in sleep mode is approximately -9.5V and the maximum voltage is approximately +6.5V. Therefore, it may be difficult to accurately detect the charging status.

[0089] refer to Figure 14 According to an embodiment of the present invention, the charging device can prevent current leakage. Therefore, it can be seen that the waveform of the CP signal detected on the EV side in sleep mode has a minimum voltage of -12V and a maximum voltage of +8.5V, which is close to a normal waveform.

[0090] Therefore, according to embodiments of the present invention, in a charging device that supports both V2V mode and EV mode, leakage current to the power supply module supporting V2V mode is prevented, thus enabling accurate detection of the charging status.

[0091] Although the present invention has been described above with reference to preferred embodiments thereof, it will be understood that various modifications and alterations may be made to the present invention by those skilled in the art without departing from the scope and spirit of the invention as described in the following claims.

[0092] [Explanation of reference numerals in the attached diagram]

[0093] 10: Electric vehicles

[0094] 20: Electric vehicle power supply equipment

[0095] 22: Charging cable

[0096] 100: Charging device

[0097] 110: Connector Unit

[0098] 120: Power supply module

[0099] 130: Charging module

[0100] 140: Controller

Claims

1. A charging device for electric vehicles, comprising: The power supply module is used to transmit the first pulse width modulation (PWM) signal to the outside in a first mode. A charging module for receiving a second PWM signal from an external source in a second mode; as well as The control unit controls the power supply module and the charging module. The charging module includes a first line for receiving connector proximity detection signals and a second line for receiving control guidance signals. The power supply module includes a signal output unit that outputs the first PWM signal, a resistor unit disposed between the signal output unit and the second line, and a leakage current blocking unit disposed between the signal output unit and the resistor unit.

2. The charging device according to claim 1, wherein, The leakage current blocking unit includes a diode and blocks the flow of current from the resistor unit toward the signal output unit.

3. The charging device according to claim 1, wherein, The resistor unit includes a 1kΩ resistor.

4. The charging device according to claim 1, wherein, The signal output unit includes a power enhancement integrated chip (IC).

5. The charging device according to claim 1, wherein, The signal output unit includes: a comparator for comparing the voltage value of a pulse signal generated by the controller with a reference value; a first power supply connected to a first terminal of the comparator; a first switch connected to the first power supply; a second power supply connected to a second terminal of the comparator; and a second switch connected to the second power supply. The first switch and the second switch are turned on alternately according to the comparison result of the comparator.

6. The charging device according to claim 5, wherein, The first power supply unit supplies +12V±0.6V power, and the second power supply unit supplies -12V±0.6V power.

7. The charging device according to claim 5, wherein, The leakage current blocking unit includes a first diode disposed between the first switch and the resistor unit, and a second diode disposed between the second switch and the resistor unit. The first diode is configured to conduct in the direction from the first switch toward the resistor unit, and the second diode is configured to conduct in the direction from the second switch toward the resistor unit.

8. The charging device according to claim 1, wherein, The charging module includes a detection unit that detects at least one of the duty cycle and voltage of the second PWM signal.

9. The charging device according to claim 8, wherein, The detection unit is connected to the power supply module and also detects at least one of the duty cycle and voltage of the first PWM signal.

10. The charging device according to claim 1, wherein, The leakage current blocking unit blocks the second PWM signal from leaking to the power supply module.

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