Apparatus and method for diagnosing relay in vehicle OBC, and battery charging apparatus

Abstract

The invention discloses a device and method for diagnosing a relay in a vehicle OBC and a battery charging device. The present disclosure relates to a technique for diagnosing a relay in an on-board charger (OBC), and an apparatus for diagnosing a relay in a vehicle OBC according to an exemplary embodiment may include: first to third voltage sensors configured to measure a phase-specific voltage for an AC input of a relay circuit unit; a fourth voltage sensor and a fifth voltage sensor configured to measure a line voltage from an AC output of the relay circuit unit; and a diagnostic module configured to diagnose the relay circuit unit based on the phase-specific voltages measured by the first to third voltage sensors and based on the line voltages measured by the fourth and fifth voltage sensors.

Description

Technical Field

[0001] The present disclosure relates to relay diagnostic techniques. Background Art

[0002] Vehicle to Grid (V2G) refers to the function of supplying power to the grid power unit by using the high-voltage battery of the vehicle. Utilizing V2G enables consumers to earn additional profits from electricity sales, and enables electricity sellers to actually use the high-voltage battery of the vehicle as an electric storage system (ESS) by storing and efficiently using electricity in the high-voltage battery.

[0003] V2G can be achieved through communication between the on-board charger (OBC) (or bidirectional slow charger), the vehicle charge management system (VCMS) and the electric vehicle supply equipment (EVES).

[0004] For safety reasons, network and system protection (NS protection) is legally performed on V2G. When the relay in the OBC fails to work properly due to a fuse or the like, the NS protection cannot be performed normally, so the diagnosis of the relay failure in the OBC is very important. Therefore, a technology for diagnosing the failure of the relay in the OBC is required.

[0005] Therefore, a technology for diagnosing a fault of a relay in an OBC by using a voltage sensor for relay diagnosis has been proposed, wherein the voltage sensor for relay diagnosis needs to be additionally provided, resulting in an increase in cost.

[0006] The above-mentioned background art is technical information possessed by the inventor of the present disclosure to derive the present disclosure or technical information obtained in the process of deriving the present disclosure, and cannot necessarily be said to be common known art disclosed to the public before filing the present disclosure. Summary of the invention

[0007] The present disclosure relates to a relay diagnosis technology, and more particularly, to an apparatus for diagnosing a relay in an on-board charger (OBC) of a vehicle, a method thereof, and a battery charging apparatus including the apparatus.

[0008] The exemplary embodiments disclosed herein are capable of solving the above-mentioned problems, and therefore, the exemplary embodiments provide a device for diagnosing a relay in a vehicle OBC, which is capable of diagnosing a relay (blown or open) by operating the relay in the OBC at the start of operation, a method for diagnosing a relay, and a battery charging device including the device.

[0009] An exemplary embodiment provides an apparatus for diagnosing a relay in a vehicle OBC, a method for diagnosing a relay in a vehicle OBC, and a battery charging device including the apparatus, wherein the apparatus for diagnosing a relay in a vehicle OBC is capable of diagnosing the relay in the OBC by using a pre-installed voltage sensor for control or power identification (e.g., an input phase voltage sensor or a PFC line voltage sensor) without adding components such as a voltage sensor for relay diagnosis.

[0010] An exemplary embodiment provides an apparatus for diagnosing a relay in a vehicle OBC, a method for diagnosing a relay in a vehicle OBC, and a battery charging device including the apparatus, wherein the apparatus for diagnosing a relay in a vehicle OBC is capable of performing at least one of relay diagnosis in L1 phase operation, relay diagnosis in L1-L2 phase operation, relay diagnosis in L1-L3 phase operation, and relay diagnosis in three-phase operation.

[0011] The technical subject matter of the present disclosure may not be limited to the above-mentioned technical subject matter, and those skilled in the art to which the present disclosure belongs may clearly understand other technical subject matter contemplated by the present disclosure through the following description.

[0012] In an embodiment, an apparatus for diagnosing a relay in an on-board charger (OBC) of a vehicle, a method for diagnosing a relay in an OBC, and a battery charging apparatus including the same may be provided.

[0013] The apparatus for diagnosing a relay in a vehicle OBC according to an exemplary embodiment of the present disclosure may be an apparatus for diagnosing a relay circuit unit that is provided in a vehicle OBC and includes a plurality of relays.

[0014] According to an exemplary embodiment, an apparatus for diagnosing a relay in a vehicle OBC may include: first to third voltage sensors configured to measure a phase-specific voltage of an AC input to a relay circuit unit; fourth and fifth voltage sensors configured to measure a line voltage of an AC output from the relay circuit unit; and a diagnostic module configured to diagnose the relay circuit unit based on the phase-specific voltage measured by the first to third voltage sensors and the line voltage measured by the fourth and fifth voltage sensors.

[0015] According to an exemplary embodiment, the first to third voltage sensors may respectively measure voltages of L1 to L3 phases respectively input through the first to third AC input terminals.

[0016] According to an exemplary embodiment, the fourth voltage sensor may measure an L1 - L3 line voltage between an L1 phase output through the first AC output terminal and an L3 phase output through the third AC output terminal.

[0017] According to an exemplary embodiment, the fifth voltage sensor may measure an L2 - L3 line voltage between an L2 phase and an L3 phase output through the second AC output terminal.

[0018] According to an exemplary embodiment, the relay circuit unit may include an L1 relay and a pre-charge relay arranged in parallel between a first AC input terminal to which an L1 phase voltage is input and a first AC output terminal from which the L1 phase voltage is output, an L1-L2 relay arranged between the first AC input terminal and the second AC output terminal from which the L2 phase voltage is output, an L2 relay arranged between the second AC input terminal to which the L2 phase voltage is input and the second AC output terminal, an L3 relay arranged between a third AC input terminal to which the L3 phase voltage is input and the third AC output terminal from which the L3 phase voltage is output, and a neutral relay arranged between the ground and the third AC output terminal.

[0019] According to an exemplary embodiment, the diagnostic module may perform at least one of relay diagnosis in L1 phase operation, relay diagnosis in L1-L2 phase operation, relay diagnosis in L1-L3 phase operation, and relay diagnosis in three-phase operation.

[0020] According to an exemplary embodiment, the diagnostic module can diagnose the open state and fused state of the neutral relay, the open state and fused state of the L1 relay, the open state and fused state of the pre-charge relay, and the open state and fused state of the L1-L2 relay by performing relay diagnosis in L1 phase operation.

[0021] According to an exemplary embodiment, the diagnostic module can diagnose the open state and the blown state of the pre-charging relay, the open state and the blown state of the L1 relay, the open state and the blown state of the L2 relay, the blown state of the neutral relay, and the blown state of the L1-L2 relay by performing relay diagnosis in the L1-L2 phase operation.

[0022] According to an exemplary embodiment, the diagnostic module can diagnose the open state and the fused state of the L1 relay, the open state and the fused state of the pre-charge relay, the open state and the fused state of the L3 relay, the open state of the L2 relay, and the fused state of the neutral relay by performing relay diagnosis in the L1-L3 phase operation.

[0023] According to an exemplary embodiment, the diagnostic module can diagnose the open circuit state and the fused state of the pre-charging relay, the open circuit state and the fused state of the L1 relay, the open circuit state and the fused state of the L2 relay, the open circuit state and the fused state of the L3 relay, the fused state of the L1_L2 relay and the fused state of the neutral relay by performing relay diagnosis in three-phase operation.

[0024] According to an exemplary embodiment, when performing relay diagnosis in L1 phase operation, the diagnostic module may perform relay diagnosis based on voltages measured when the pre-charge relay is on, the neutral relay is on, the pre-charge relay is off, the L1 relay is on, and the L1-L2 relay is on.

[0025] According to an exemplary embodiment, when performing relay diagnosis in L1-L2 phase operation, the diagnosis module may perform relay diagnosis based on voltages measured when the pre-charge relay is on, the L2 relay is on, the pre-charge relay is off, and the L1 relay is on.

[0026] According to an exemplary embodiment, when performing relay diagnosis in L1-L3 phase operation, the diagnosis module may perform relay diagnosis based on voltages sequentially measured when the pre-charge relay is turned on, the L3 relay is turned on, the pre-charge relay is turned off, and the L1 relay is turned on.

[0027] According to an exemplary embodiment, when relay diagnosis is performed in three-phase operation, the diagnostic module can perform relay diagnosis based on voltages measured sequentially when the pre-charge relay is turned on, the L3 relay is turned on, the pre-charge relay is turned off, the L1 relay and the L2 relay are turned on, and the L1_L2 relay is turned on.

[0028] According to an exemplary embodiment, when it is determined that an abnormality of a random relay is diagnosed while diagnosing a plurality of relays in a relay circuit unit, the diagnosis module may terminate the diagnosis operation without performing a process after determining that the abnormality is diagnosed.

[0029] The method for diagnosing a relay in a vehicle OBC according to an exemplary embodiment of the present disclosure may be a method for diagnosing a relay circuit unit that is provided in a vehicle OBC and includes a plurality of relays.

[0030] According to an exemplary embodiment, a method for diagnosing a relay in a vehicle OBC may include: measuring a phase-specific voltage of AC input to a relay circuit unit by using a first voltage sensor to a third voltage sensor; measuring a line voltage of AC output from the relay circuit unit by using a fourth voltage sensor and a fifth voltage sensor; and diagnosing the relay circuit unit based on the phase-specific voltage measured by the first to third voltage sensors and the line voltage measured by the fourth and fifth voltage sensors.

[0031] According to an exemplary embodiment, a method for diagnosing a relay in a vehicle OBC may include performing at least one of relay diagnosis in L1 phase operation, relay diagnosis in L1-L2 phase operation, relay diagnosis in L1-L3 phase operation, and relay diagnosis in three-phase operation based on a phase-specific voltage and a line voltage.

[0032] According to an exemplary embodiment, in a method for diagnosing a relay in a vehicle OBC, when relay diagnosis is performed in L1 phase operation, relay diagnosis can be performed based on voltages measured sequentially when the pre-charge relay is turned on, the neutral relay is turned on, the pre-charge relay is turned off, the L1 relay is turned on, and the L1-L2 relay is turned on.

[0033] According to an exemplary embodiment, in a method for diagnosing a relay in a vehicle OBC, when relay diagnosis is performed in L1-L2 phase operation, relay diagnosis can be performed based on voltages measured sequentially when the pre-charge relay is turned on, the L2 relay is turned on, the pre-charge relay is turned off, and the L1 relay is turned on.

[0034] According to an exemplary embodiment, in a method for diagnosing a relay in a vehicle OBC, when relay diagnosis is performed in L1-L3 phase operation, relay diagnosis can be performed based on voltages measured sequentially when the pre-charge relay is turned on, the L3 relay is turned on, the pre-charge relay is turned off, and the L1 relay is turned on.

[0035] According to an exemplary embodiment, in a method for diagnosing a relay in a vehicle OBC, when relay diagnosis is performed in three-phase operation, relay diagnosis can be performed based on voltages measured sequentially when the pre-charge relay is turned on, the L3 relay is turned on, the pre-charge relay is turned off, the L1 relay and the L2 relay are turned on, and the L1_L2 relay is turned on.

[0036] According to an exemplary embodiment, in a method for diagnosing relays in a vehicle OBC, the open state and the fused state of the neutral relay, the open state and the fused state of the L1 relay, the open state and the fused state of the pre-charge relay, and the open state and the fused state of the L1-L2 relay can be diagnosed by performing relay diagnosis in L1 phase operation.

[0037] According to an exemplary embodiment, in a method for diagnosing relays in a vehicle OBC, the open state and the fused state of the pre-charging relay, the open state and the fused state of the L1 relay, the open state and the fused state of the L2 relay, the fused state of the neutral relay, and the fused state of the L1-L2 relay can be diagnosed by performing relay diagnosis in the L1-L2 phase operation.

[0038] According to an exemplary embodiment, in a method for diagnosing relays in a vehicle OBC, the open state and the fused state of the L1 relay, the open state and the fused state of the pre-charging relay, the open state and the fused state of the L3 relay, the open state of the L2 relay, and the fused state of the neutral relay can be diagnosed by performing relay diagnosis in the L1-L3 phase operation.

[0039] According to an exemplary embodiment, in a method for diagnosing relays in a vehicle OBC, the open state and the fused state of the pre-charging relay, the open state and the fused state of the L1 relay, the open state and the fused state of the L2 relay, the open state and the fused state of the L3 relay, the fused state of the L1_L2 relay, and the fused state of the neutral relay can be diagnosed by performing relay diagnosis in three-phase operation.

[0040] According to an exemplary embodiment, in a method for diagnosing a relay in a vehicle OBC, when it is determined that an abnormality of a random relay is diagnosed while diagnosing a plurality of relays in a relay circuit unit, the diagnosis operation may be terminated without performing a process after determining that the abnormality is diagnosed.

[0041] A battery charging apparatus according to an exemplary embodiment of the present disclosure may include an input circuit including a relay circuit unit including a plurality of relays and a relay diagnosis unit configured to diagnose the relay circuit unit.

[0042] According to the exemplary embodiment, the relay diagnosis unit may be an apparatus for diagnosing a relay according to the exemplary embodiment of the present disclosure.

[0043] According to an exemplary embodiment, the relay diagnosis unit may perform diagnosis based on a voltage measured by controlling operations of a plurality of relays in the relay circuit unit.

[0044] In addition to the solutions to the above-mentioned technical subjects, detailed details of various embodiments according to the present disclosure are included in the following description and drawings.

[0045] According to an exemplary embodiment of the present disclosure, a device for diagnosing a relay in a vehicle on-board charger (OBC), a method for diagnosing a relay in a vehicle OBC, and a battery charging device including the device may be provided, wherein the device for diagnosing a relay in a vehicle OBC is capable of diagnosing a relay in a vehicle OBC.

[0046] According to the exemplary embodiment, since the relay in the OBC is diagnosed at the start of the operation, the operation of the relay in a faulty state may be prevented, thereby preventing abnormal operation of the OBC due to the operation of the relay in the faulty state.

[0047] In addition, since the relay in the OBC can be diagnosed by using a voltage sensor (e.g., an input phase voltage sensor or a PFC line voltage sensor) pre-installed for control or power identification, the relay in the OBC can be diagnosed without adding a component such as a voltage sensor for relay diagnosis. Therefore, the cost increase that occurs when a sensor for diagnosing the relay is separately installed can be solved.

[0048] In addition, according to an exemplary embodiment, at least one of relay diagnosis in L1 phase operation, relay diagnosis in L1-L2 phase operation, relay diagnosis in L1-L3 phase operation, and relay diagnosis in three-phase operation can be performed, so that the relay can be diagnosed according to various operation types.

[0049] Advantageous effects of the present disclosure may not be limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those skilled in the art to which the present disclosure belongs through the following description.

[0050] The above-mentioned subjects to be solved, technical solutions and advantageous effects are not intended to specify the essential features of the claims, and therefore, the protection scope of the claims is not necessarily limited to the description of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The accompanying drawings are used to help understand the exemplary embodiments of the present disclosure, and provide exemplary embodiments together with the specific embodiments. However, the technical features of the exemplary embodiments are not limited to specific drawings, and the features disclosed in the corresponding drawings can be combined with each other to form new exemplary embodiments. The above and other features and other advantages of the embodiments of the present disclosure can be more clearly understood from the following detailed description in conjunction with the accompanying drawings, in which:

[0052] Figure 1 shows a configuration of a battery charging device according to an exemplary embodiment of the present disclosure;

[0053] Figure 2 shows a detailed structure of a relay circuit unit of an input circuit according to an exemplary embodiment of the present disclosure;

[0054] Figure 3 shows a detailed structure of a diagnosis unit according to an exemplary embodiment of the present disclosure;

[0055] Figure 4 An embodiment of a method for diagnosing a relay in a vehicle OBC performing single-phase (L1 phase) operation is shown;

[0056] Figure 5An embodiment of a method for diagnosing a relay in a vehicle OBC performing L1-L2 phase operation is shown;

[0057] Figure 6 An embodiment of a method for diagnosing a relay in a vehicle OBC performing L1-L3 phase operation is shown; and

[0058] Figure 7 and Figure 8 An embodiment of a method for diagnosing a relay in a vehicle OBC performing three-phase operation is shown. DETAILED DESCRIPTION

[0059] By referring to the embodiments described in detail below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the ways to achieve them can be apparent. However, the present disclosure is not necessarily limited to the embodiments set forth below, but can be implemented in various different forms. The following embodiments are provided only to fully disclose the present disclosure and inform those skilled in the art of the scope of the present disclosure, and the present disclosure is limited only by the scope of the appended claims.

[0060] The shapes, sizes, ratios, angles and numbers disclosed in the drawings for illustrating the embodiments of the present disclosure are provided only by way of example, and therefore, the present disclosure is not necessarily limited to those shown in the drawings. Throughout this specification, the same or similar reference symbols may designate the same or similar elements. In addition, when describing the present disclosure, when it is determined that the detailed description of the known related art does not necessarily obscure the subject matter of the present disclosure, the detailed description may be omitted. In the case of the expressions "including", "having" and "including" mentioned in the specification, another part may be added unless the term "only" is used. Elements expressed in the singular may include plural forms unless otherwise expressly indicated.

[0061] When explaining an element, the element may be interpreted as covering the error range although the error range is not explicitly described.

[0062] When describing a temporal relationship, when a temporal order is described using terms such as “after,” “after,” “immediately,” or “before,” the temporal order may include discontinuous cases unless the term “just” or “immediately” is used.

[0063] The terms "first", "second", etc. may be used to describe various elements, but the elements are not necessarily limited by these terms. These terms may only be used to distinguish one element from other elements. Therefore, without departing from the spirit of the present disclosure, the first element used in the following description may be the second element.

[0064] When describing elements of the present disclosure, terms such as "first", "second", "A", "B", "(a)", and "(b)" may be used. These terms may be used only to distinguish the corresponding elements from other elements, and the nature, order, sequence, or number of the corresponding elements are not necessarily limited by these terms. It will be understood that when an element is referred to as being "connected to" or "coupled to" another element, the element may be directly connected to or coupled to the other element, but another element may be inserted between corresponding elements that may be indirectly connected or coupled to each other.

[0065] The term "at least one" should be understood to include any or all combinations of one or more of the listed related elements. For example, "at least one of a first element, a second element, and a third element" may not only represent the first element, the second element, or the third element, but may also represent all combinations of two or more of the first element, the second element, and the third element.

[0066] The corresponding features of the various embodiments of the present disclosure may be partially or completely coupled or combined with each other, and may be technically linked and interoperable with each other in various ways. The various embodiments of the present disclosure may be executed independently of each other or may be executed in association with each other.

[0067] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings and the embodiments set forth herein. For ease of description, the proportions of elements shown in the drawings may be different from the actual proportions, and therefore the elements are not necessarily limited to the proportions shown in the drawings.

[0068] Hereinafter, an apparatus for diagnosing a relay in a vehicle OBC, a method for diagnosing a vehicle OBC, and a battery charging apparatus including the same according to exemplary embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0069] Figure 1 The configuration of a battery charging device 1 according to an exemplary embodiment of the present disclosure is shown.

[0070] See also Figure 1 , the battery charging apparatus 1 according to the exemplary embodiment of the present disclosure may be a bidirectional OBC mounted on a vehicle.

[0071] The battery charging device 1 according to an exemplary embodiment may include an input circuit 100, a power factor correction circuit (PFC) 200, a DC / DC converter 300, a vehicle-to-load (V2L) discharge circuit 400, a relay diagnostic unit (or relay diagnostic device) 500, and a controller 600, but the configuration of the battery charging device 1 is not necessarily limited thereto.

[0072] The input circuit 100 according to the exemplary embodiment may operate under the control of the controller 600 , may input AC power through the charging / discharging port 10 , and may output the AC power to the PFC 200 after the input circuit 100 .

[0073] For example, the input circuit 100 may be located between the charge / discharge port 10 and the PFC 200 , or connected to the charge / discharge port 10 and the PFC 200 .

[0074] The charging / charging port 10 may include a first AC input terminal L1 , a second AC input terminal L2 , a third AC input terminal L3 , and a neutral terminal N, and may support a battery charging mode and a battery discharging mode.

[0075] In an exemplary embodiment, the first AC input terminal L1 may be a terminal to which an L1 phase AC voltage is input, the second AC input terminal L2 may be a terminal to which an L2 phase AC voltage is input, and the third AC input terminal L3 may be a terminal to which an L3 phase AC voltage is input.

[0076] For example, the first to third AC input terminals L1 to L3 may be located between the external AC power source and the input circuit 100 and may transmit input external AC power to the input circuit 100 , and the neutral point terminal N may be located between the ground and the input circuit 100 .

[0077] In an exemplary embodiment, the AC power may be a single-phase AC power source or a three-phase AC power source.

[0078] The input circuit 100 may include a relay circuit unit 110 and an electromagnetic interference (EMI) filter 120 , and the configuration of the input circuit 100 is not necessarily limited thereto.

[0079] The relay circuit unit 110 may be located between the charging / discharging port 10 and the EMI filter 120 , and the EMI filter 120 may be located between the relay circuit unit 110 and the PFC 200 .

[0080] The relay circuit unit 110 may include a relay that is turned on / off in response to the control of the controller 600 , and may transfer AC input through the charging / discharging port 10 to the EMI filter 120 through a relay on operation and a relay off operation.

[0081] According to an exemplary embodiment, the relay circuit unit 110 may be controlled by a relay diagnosis unit 500 that performs relay diagnosis.

[0082] The EMI filter 120 may remove electrical noise included in the AC voltage transmitted from the relay circuit unit 110 .

[0083] The following will refer to Figure 2 A detailed description of the relay circuit unit 110 according to an exemplary embodiment of the present disclosure is described.

[0084] The PFC 200 may be located between the input circuit 100 and the DC-DC converter 300 , and may be operated under the control of the controller 600 .

[0085] The PFC 200 may convert the AC voltage transmitted from the input circuit 100 into a DC voltage to output the DC voltage, and may correct the power factor of the voltage. That is, the PFC 200 may perform a rectification function of converting the AC voltage into a DC voltage, and may increase the power factor by reducing the phase difference between the input current and the input voltage.

[0086] The DC-DC converter 300 may be disposed between the PFC 200 and the output terminal 20 , and may operate under the control of the controller 600 to receive a DC voltage output from the PFC 200 and convert the magnitude of the received DC voltage.

[0087] For example, the DC-DC converter 300 may include a full-bridge and / or half-bridge structure, but the structure of the DC-DC converter 300 is not necessarily limited thereto.

[0088] The DC-DC converter 300 may charge a battery (not shown) by outputting a DC voltage through an output terminal 20 connected to the battery.

[0089] The V2L discharge circuit 400 may be provided between the relay circuit unit 110 and the EMI filter 120 , and may operate under the control of the controller 600 to perform vehicle-to-load (V2L) discharge.

[0090] The relay diagnosis unit (or relay diagnosis device) 500 may be connected to the input circuit 100 , and may operate under the control of the controller 600 to diagnose the relay circuit unit 110 in the input circuit 100 .

[0091] For example, the relay diagnostic unit 500 may determine the state of the relay (blown state, open state, etc.) through diagnosis.

[0092] According to an exemplary embodiment, the relay diagnosis unit 500 may control the relay circuit unit 110 to diagnose the relay circuit unit 110 .

[0093] The relay diagnosis unit 500 may diagnose the relay based on the voltage within the relay circuit unit 110 measured according to the control, and may output the diagnosis result to the controller 600 .

[0094] According to an exemplary embodiment, the relay diagnosis unit 500 may diagnose only the relay circuit unit 110 based on the voltage measured with respect to the relay circuit unit 110 without controlling the relay circuit unit 110 .

[0095] According to an exemplary embodiment, the relay diagnosis unit 500 may diagnose the relay circuit unit 110 while controlling the relay circuit unit 110 according to the diagnosis type.

[0096] For example, the relay diagnosis unit 500 may control the relay circuit unit 110 according to the relay diagnosis of single-phase operation, the relay diagnosis of two-phase (L1-L2 or L1-L3) operation, or the relay diagnosis of three-phase operation.

[0097] The relay diagnosis unit 500 may store a relay control algorithm and a relay diagnosis algorithm for each diagnosis type.

[0098] The following will refer to Figure 3 A detailed description of the relay diagnosis unit 500 according to an exemplary embodiment of the present disclosure is described.

[0099] The controller 600 can control the operations of other components 100, 200, 300, 400 and 500 in the battery charging device 1, can enable the battery charging device 1 to charge the battery based on external AC power (battery charging mode), and can enable the power of the battery to be discharged through at least one of the charging / charging port 10 or the V2L discharge circuit 400 (battery discharge mode).

[0100] Although not shown in the drawings, the controller 600 may include: a communication device that communicates with a different controller or sensor to control the functions that the controller 600 is responsible for; a memory that stores an operating system or input and output information such as logic commands; and at least one processor that performs determinations, calculations, and decisions required to control the functions that the controller 600 is responsible for.

[0101] although Figure 1 The exemplary embodiment of the embodiment shows the relay diagnostic unit 500 provided separately from the controller 600, but the embodiments of the present disclosure are not limited thereto. For example, the relay diagnostic unit 500 may be configured inside the controller 600. Alternatively, the controller 600 may be configured to perform one or more functions of the relay diagnostic unit 500.

[0102] According to an exemplary embodiment, the controller 600 may control the relay circuit unit 110 so that the relay diagnosis unit 500 may measure a voltage required for relay diagnosis.

[0103] Figure 2shows a detailed structure of the relay circuit unit 110 of the input circuit 100 according to an exemplary embodiment of the present disclosure, and Figure 3 A detailed structure of the relay diagnosis unit 500 according to an exemplary embodiment of the present disclosure is shown.

[0104] See also Figures 1 to 3 , the relay circuit unit 110 of the input circuit 100 may include a plurality of relays located (or connected) in parallel between the charging / discharging port 10 and the EMI filter 120 .

[0105] According to an exemplary embodiment, the relay circuit unit 110 may include a precharge relay RLY_PreChg, an L1 relay RLY_L1, an L1-L2 relay RLY_L1_L2, an L2 relay RLY_L2, an L3 relay RLY_L3, and a neutral relay (RLY_N_A), but the configuration of the relay circuit unit 110 is not necessarily limited thereto.

[0106] The pre-charge relay RLY_PreChg may be located in series between the first AC input terminal L1 of the charge / discharge port 10 and the first AC output terminal A1 of the relay circuit unit 110 , and the L1 relay RLY_L1 may also be located in series between the first AC input terminal L1 of the charge / discharge port 10 and the first AC output terminal A1 of the relay circuit unit 110 .

[0107] Therefore, the pre-charge relay RLY_PreChg and the L1 relay RLY_L1 may be located in parallel between the first AC input terminal L1 of the charging / discharging port 10 and the first AC output terminal A1 of the relay circuit unit 110 .

[0108] An initial charging resistor may be provided in series between the first AC input terminal L1 of the charging / discharging port 10 and the pre-charging relay RLY_PreChg.

[0109] The L1-L2 relay RLY_L1_L2 may be arranged in series between the first AC input terminal L1 of the charging / discharging port 10 and the second AC output terminal A2 of the relay circuit 110 , and the L2 relay RLY_L2 may be arranged in series between the second AC input terminal L2 of the charging / discharging port 10 and the second AC output terminal A2 of the relay circuit unit 110 .

[0110] The L3 relay RLY_L3 can be arranged in series between the third AC input terminal L3 of the charging / discharging port 10 and the third AC output terminal A3 of the relay circuit unit 110, and the neutral relay RLY_N_A can be arranged in series between the neutral terminal N of the charging / discharging port 10 and the third AC output terminal A3 of the relay circuit unit 110.

[0111] In an exemplary embodiment, an input terminal of the pre-charging relay RLY_PreChg, an input terminal of the L1 relay RLY_L1 , and an input terminal of the L1-L2 relay RLY_L1_L2 may be commonly connected to the first AC input terminal L1 .

[0112] The first AC output terminal A1 may be a terminal from which an L1 phase AC voltage is output, the second AC output terminal A2 may be a terminal from which an L2 phase AC voltage is output, and the third AC output terminal A3 may be a terminal from which an L3 phase AC voltage is output.

[0113] For explanation, the AC input terminal of the relay circuit unit 110 to which the input terminal of the pre-charging relay RLY_PreChg, the input terminal of the L1 relay RLY_L1, and the input terminal of the L1-L2 relay RLY_L1_L2 are commonly connected is referred to as a common AC input terminal CT.

[0114] The relay diagnostic unit (or relay diagnostic apparatus) 500 according to the exemplary embodiment may diagnose the relay within the relay circuit unit 110 .

[0115] According to an exemplary embodiment, the relay diagnostic unit 500 may include first to fifth voltage sensors 510 to 550 and a diagnostic module 560 , but the configuration of the relay diagnostic unit 500 is not necessarily limited thereto.

[0116] The first to third voltage sensors 510 to 530 may measure a phase-specific voltage of AC input to the relay circuit unit 110. For example, the first to third voltage sensors 510 to 530 may measure a phase-specific voltage for AC between the charging / charging port 10 and the relay circuit unit 110.

[0117] According to an exemplary embodiment, the first voltage sensor 510 may measure the phase voltage of AC input through the first AC input terminal L1 of the charge / discharge port 10 (here, L1 phase voltage), the second voltage sensor 520 may measure the phase voltage of AC input through the second AC input terminal L2 of the charge / discharge port 10 (here, L2 phase voltage), and the third voltage sensor 530 may measure the phase voltage of AC input through the third AC input terminal L3 of the charge / discharge port (here, L3 phase voltage).

[0118] The first voltage sensor 510 can measure the voltage between the first AC input terminal L1 and the neutral terminal N of the charging / discharging port 10 (L1-N voltage), the second voltage sensor 520 can measure the voltage between the second AC input terminal L2 and the neutral terminal N of the charging / discharging port 10 (L2-N voltage), and the third voltage sensor 530 can measure the voltage between the third AC input terminal L3 and the neutral terminal N of the charging / discharging port 10 (L3-N voltage).

[0119] For example, the first voltage sensor 510 may measure a voltage (L1-N voltage) between a random point between the first AC input terminal L1 of the charging / discharging port 10 and the common AC input terminal CT of the relay circuit unit 110 and a random point between the neutral terminal N of the charging / discharging port 10 and the neutral relay input terminal T3 of the relay circuit unit 110.

[0120] For example, the second voltage sensor 520 may measure a voltage (L2-N voltage) between a random point between the second AC input terminal L2 of the charging / discharging port 10 and the L2 relay input terminal T1 of the relay circuit unit 110 and a random point between the neutral terminal N of the charging / discharging port 10 and the neutral relay input terminal T3 of the relay circuit unit 110.

[0121] For example, the third voltage sensor 530 may measure a voltage (L3-N voltage) between a random point between the third AC input terminal L3 of the charging / discharging port 10 and the L3 relay input terminal T2 of the relay circuit unit 110 and a random point between the neutral terminal N of the charging / discharging port 10 and the neutral relay input terminal T3 of the relay circuit unit 110.

[0122] The fourth voltage sensor 540 and the fifth voltage sensor 550 may measure the line voltage of AC output from the relay circuit unit 110 .

[0123] According to an exemplary embodiment, the fourth voltage sensor 540 may measure a voltage between the L1 phase and the L3 phase (L1-L3 line voltage or L1-L3 voltage), and the fifth voltage sensor 550 may measure a voltage between the L2 phase and the L3 phase (L2-L3 line voltage or L2-L3 voltage).

[0124] For example, the fourth voltage sensor 540 may measure a voltage (L1-L3 line voltage) between the first AC output terminal A1 and the third AC output terminal A3 of the relay circuit unit 110, and the fifth voltage sensor 550 may measure a voltage (L2-L3 line voltage) between the second AC output terminal A2 and the third AC output terminal A3 of the relay circuit unit 110.

[0125] The diagnosis module 560 may diagnose the relays of the relay circuit unit 110 based on the voltages measured by the first to fifth voltage sensors 510 to 550 .

[0126] According to an exemplary embodiment, the diagnosis module 560 may control the operation of the relay circuit unit 110 to diagnose the relay circuit unit 110 .

[0127] The diagnostic module 560 may store a relay control algorithm for each diagnostic type and a relay diagnostic algorithm for each diagnostic type.

[0128] According to an exemplary embodiment of the present disclosure, diagnosis of a relay in a vehicle OBC may be in four types (cases 1, 2, 3, and 7) as shown in Table 1.

[0129] Since the charging operation is possible only when the voltage of the phase to which the initial charging (IC) resistor is connected is applied, Cases 4 to 6 in which the L1 phase to which the initial charging resistor is connected is not input are excluded from the diagnosis type.

[0130] Table 1

[0131]

[0132] Figure 4 An embodiment of a method for diagnosing a relay in a vehicle OBC performing single-phase (L1 phase) operation is shown.

[0133] See also Figure 4 A method embodiment for diagnosing a relay in a vehicle OBC performing single-phase (L1 phase) operation is described. For illustration, the method embodiment is described as being performed by a relay diagnostic unit (or relay diagnostic device) 500 , but may be performed by a controller 600 .

[0134] First (reference Figure 4), the relay diagnostic unit 500 may turn on the pre-charge relay RLY_PreChg (operation S400), and may determine whether the L1-L3 line voltage is not 0 (operation S401).

[0135] When it is determined in operation S401 that the L1 - L3 line voltage is not 0 ( S401 =Yes), the relay diagnosis unit 500 may diagnose the neutral relay RLY_N_A as being in a fused state (operation S402 ).

[0136] When it is determined in operation S401 that the L1-L3 line voltage is 0 (S401=No) or the neutral relay RLY_N_A is diagnosed to be in a blown state (operation S402), the relay diagnosis unit 500 may turn on the neutral relay RLY_N_A (operation S403) and may determine whether the L1-L3 line voltage is 0 (operation S404).

[0137] When it is determined in operation S404 that the L1 - L3 line voltage is 0 ( S404 =Yes), the relay diagnosis unit 500 may diagnose the neutral relay RLY_N_A or the pre-charge relay RLY_PreChg as being in an open state (operation S405 ).

[0138] When it is determined in operation S404 that the L1-L3 line voltage is not 0 (S404=No), or when the neutral relay RLY_N_A or the pre-charge relay RLY_PreChg is diagnosed to be in an open state (operation S405), the relay diagnostic unit 500 can determine whether the difference between the L1 phase voltage and the L3 phase voltage is equal to the L2-L3 line voltage (operation S406).

[0139] When it is determined in operation S406 that the difference between the L1 phase voltage and the L3 phase voltage is equal to the L2 - L3 line voltage ( S406 =Yes), the relay diagnosis unit 500 may diagnose the L1 - L2 relay RLY_L1_L2 as being in a blown state (operation S407 ).

[0140] When it is determined in operation S406 that the difference between the L1 phase voltage and the L3 phase voltage is different from the L2-L3 line voltage (S406=No) or the L1-L2 relay RLY_L1_L2 is diagnosed to be in a blown state (operation S407), the relay diagnostic unit 500 can disconnect the pre-charging relay RLY_PreChg (operation S408) and can determine whether the difference between the L1 phase voltage and the L3 phase voltage is equal to the L1-L3 line voltage (operation S409).

[0141] When it is determined in operation S409 that the difference between the L1 phase voltage and the L3 phase voltage is equal to the L1 - L3 line voltage ( S409 =Yes), the relay diagnosis unit 500 may diagnose the pre-charging relay RLY_PreChg or the L1 relay RLY_L1 as being in a blown state (operation S410 ).

[0142] When it is determined in operation S409 that the difference between the L1 phase voltage and the L3 phase voltage is not equal to the L1-L3 line voltage (S409=No), or when the diagnostic pre-charging relay RLY_PreChg or the L1 relay RLY_L1 is in a blown state (operation S410), the relay diagnostic unit 500 can turn on the L1 relay RLY_L1 (operation S411) and determine whether the difference between the L1 phase voltage and the L3 phase voltage is different from the L1-L3 line voltage (operation S412).

[0143] When it is determined in operation S412 that the difference between the L1 phase voltage and the L3 phase voltage is different from the L1 - L3 line voltage ( S412 =YES), the relay diagnosis unit 500 may diagnose the L1 relay RLY_L1 as an open state (operation S413 ).

[0144] When it is determined in operation S412 that the difference between the L1 phase voltage and the L3 phase voltage is equal to the L1-L3 line voltage (S412=No) or the diagnosis L1 relay RLY_L1 is in an open state (operation S413), the relay diagnostic unit 500 can turn on the L1-L2 relay RLY_L1_L2 (operation S414) and determine whether the difference between the L1 phase voltage and the L3 phase voltage is different from the L2-L3 line voltage (operation S415).

[0145] When it is determined in operation S415 that the difference between the L1 phase voltage and the L3 phase voltage is different from the L2 - L3 line voltage ( S415 =YES), the relay diagnosis unit 500 may diagnose the L1 - L2 relay RLY_L1_L2 as an open state (operation S416 ).

[0146] When it is determined in operation S415 that the difference between the L1 phase voltage and the L3 phase voltage is equal to the L2-L3 line voltage (S415=No) or the L1-L2 relay RLY_L1_L2 is diagnosed as being in an open state (operation S416), the relay diagnostic unit 500 may terminate the relay diagnostic operation.

[0147] According to an exemplary embodiment, when performing relay diagnosis in L1 phase operation, the relay diagnosis unit 500 may sequentially turn on the pre-charge relay, turn on the neutral relay, turn off the pre-charge relay, turn on the L1 relay, and turn on the L1-L2 relay to diagnose the relay.

[0148] When the relay diagnostic unit 500 does not directly control the relay, the relay diagnostic unit 500 may diagnose the relay based on voltages measured when sequentially turning on the precharge relay, turning on the neutral relay, turning off the precharge relay, turning on the L1 relay, and turning on the L1-L2 relay.

[0149] According to an implementation of the method for diagnosing relays, the relay diagnostic unit 500 can diagnose the open circuit state and the fused state of the neutral relay RLY_N_A, the open circuit state and the fused state of the L1 relay RLY_L1, the open circuit state and the fused state of the pre-charge relay RLY_PreChg, and the open circuit state and the fused state of the L1-L2 relay RLY_L1_L2 for the relays in the vehicle OBC performing single-phase (L1 phase) operation.

[0150] According to an exemplary embodiment, when it is determined that an abnormality (diagnosis of a blown fuse or diagnosis of an open circuit) is diagnosed while diagnosing the relay, the relay diagnostic unit 500 may terminate the diagnostic operation without performing a process after determining the diagnosis of the abnormality.

[0151] For example, in Figure 4 In the method embodiment, when it is determined in operation S402 that the neutral relay RLY_N_A is diagnosed as being blown according to the determination in operation S401, the relay diagnostic unit 500 may terminate the diagnostic operation without performing subsequent diagnostic processes (operations S403 to S416).

[0152] In another embodiment, Figure 4 In the method embodiment, when it is determined in operation S407 that the L1_L2 relay RLY_L1_L2 is diagnosed as being blown according to the determination in operation S406, the relay diagnostic unit 500 may terminate the diagnostic operation without performing subsequent diagnostic processes (operations S408 to S416).

[0153] Figure 5 An embodiment of a method for diagnosing a relay in a vehicle OBC performing L1-L2 phase operation is shown.

[0154] See also Figure 5 A method embodiment for diagnosing a relay in a vehicle OBC performing L1-L2 phase operation is described. For illustration, the method embodiment is described as being performed by a relay diagnostic unit (or relay diagnostic device) 500 , but may be performed by a controller 600 .

[0155] First (reference Figure 5 ), the relay diagnostic unit 500 may turn on the pre-charge relay RLY_PreChg (operation S500), and may determine whether the L1-L3 line voltage is not 0 (operation S501).

[0156] When it is determined in operation S501 that the L1 - L3 line voltage is not 0 ( S501 =Yes), the relay diagnosis unit 500 may diagnose the L2 relay RLY_L2 , the L3 relay RLY_L3 , or the neutral relay RLY_N_A as being in a fused state (operation S502 ).

[0157] When it is determined in operation S501 that the L1-L3 line voltage is 0 (S501=No) or the L2 relay RLY_L2, the L3 relay RLY_L3 or the neutral relay RLY_N_A is diagnosed to be in a blown state (operation S502), the relay diagnostic unit 500 can turn on the L2 relay RLY_L2 (operation S503) and can determine whether the difference between the L1-L3 line voltage and the L2-L3 line voltage is 0 (operation S504).

[0158] When it is determined in operation S504 that the difference between the L1 - L3 line voltage and the L2 - L3 line voltage is 0 ( S504 =Yes), the relay diagnosis unit 500 may diagnose the L2 relay RLY_L2 or the pre-charge relay RLY_PreChg as being in an open state (operation S505 ).

[0159] When it is determined in operation S504 that the difference between the L1-L3 line voltage and the L2-L3 line voltage is not 0 (S504=No), or when the L2 relay RLY_L2 or the pre-charging relay RLY_PreChg is diagnosed to be in an open state (operation S505), the relay diagnostic unit 500 can determine whether the difference between the L1 phase voltage and the L3 phase voltage is equal to the L2-L3 line voltage (operation S506).

[0160] When it is determined in operation S506 that the difference between the L1 phase voltage and the L3 phase voltage is equal to the L2 - L3 line voltage ( S506 =Yes), the relay diagnosis unit 500 may diagnose the L1-L2 relay RLY_L1_L2 as being in a blown state (operation S507 ).

[0161] When it is determined in operation S506 that the difference between the L1 phase voltage and the L3 phase voltage is not equal to the L2-L3 line voltage (S506=No) or when the L1-L2 relay RLY_L1_L2 is diagnosed to be in a blown state (operation S507), the relay diagnostic unit 500 can disconnect the pre-charging relay RLY_PreChg (operation S508) and determine whether the difference between the L1 phase voltage and the L3 phase voltage is equal to the L1-L3 line voltage (operation S509).

[0162] When it is determined in operation S509 that the difference between the L1 phase voltage and the L3 phase voltage is equal to the L1 - L3 line voltage ( S509 =Yes), the relay diagnosis unit 500 may diagnose the pre-charging relay RLY_PreChg or the L1 relay RLY_L1 as being in a blown state (operation S510 ).

[0163] When it is determined in operation S509 that the difference between the L1 phase voltage and the L3 phase voltage is not equal to the L1-L3 line voltage (S509=No) or the diagnostic pre-charging relay RLY_PreChg or the L1 relay RLY_L1 is in a blown state (operation S510), the relay diagnostic unit 500 can turn on the L1 relay RLY_L1 (operation S511) and can determine whether the difference between the L2 phase voltage and the L3 phase voltage is different from the L2-L3 line voltage (operation S512).

[0164] When it is determined in operation S512 that the difference between the L2 phase voltage and the L3 phase voltage is different from the L2 - L3 line voltage ( S512 =YES), the relay diagnosis unit 500 may diagnose the L1 relay RLY_L1 as an open state (operation S513 ).

[0165] When it is determined in operation S512 that the difference between the L2 phase voltage and the L3 phase voltage is equal to the L2 - L3 line voltage ( S512 =No) or when the diagnosis L1 relay RLY_L1 is in an open state (operation S513 ), the relay diagnosis unit 500 may terminate the relay diagnosis operation.

[0166] According to an exemplary embodiment, when performing relay diagnosis in L1-L2 phase operation, the relay diagnosis unit 500 may sequentially turn on the pre-charge relay, turn on the L2 relay, turn off the pre-charge relay, turn on the L1 relay, thereby diagnosing the relay.

[0167] When the relay diagnostic unit 500 does not directly control the relay, the relay diagnostic unit 500 may diagnose the relay based on voltages measured when the pre-charge relay is turned on, the L2 relay is turned on, the pre-charge relay is turned off, and the L1 relay is turned on in sequence.

[0168] According to an implementation of the method for diagnosing relays, the relay diagnostic unit 500 can diagnose the open circuit state and the fused state of the pre-charging relay RLY_PreChg, the open circuit state and the fused state of the L1 relay RLY_L1, the open circuit state and the fused state of the L2 relay RLY_L2, the fused state of the neutral relay RLY_N_A, and the fused state of the L1-L2 relay RLY_L1_L2 for the relays in the vehicle OBC that perform the L1-L2 phase operation.

[0169] According to an exemplary embodiment, when it is determined that an abnormality is diagnosed (diagnosis of a blown circuit or diagnosis of an open circuit) while diagnosing the relay, the relay diagnostic unit 500 may terminate the diagnostic operation without performing a process after determining that the abnormality is diagnosed.

[0170] For example, in Figure 5 In the method embodiment, when it is determined in operation S507 that the L1-L2 relay RLY_L1_L2 is diagnosed as being blown according to the determination in operation S506, the relay diagnostic unit 500 may terminate the diagnostic operation without performing subsequent diagnostic processing (operations S508 to S513).

[0171] Figure 6 An embodiment of a method for diagnosing a relay in a vehicle OBC performing L1-L3 phase operation is shown.

[0172] See also Figure 6 A method embodiment for diagnosing a relay in a vehicle OBC performing L1-L3 phase operation is described. For illustration, the method embodiment is described as being performed by a relay diagnostic unit (or relay diagnostic device) 500 , but may be performed by a controller 600 .

[0173] First (reference Figure 6 ), the relay diagnostic unit 500 may turn on the pre-charge relay RLY_PreChg (operation S600), and may determine whether the L1-L3 line voltage is not 0 (operation S601).

[0174] When it is determined in operation S601 that the L1 - L3 line voltage is not 0 ( S601 =Yes), the relay diagnosis unit 500 may diagnose the L2 relay RLY_L2 , the L3 relay RLY_L3 , or the neutral relay RLY_N_A as being in a fused state (operation S602 ).

[0175] When it is determined in operation S601 that the L1-L3 line voltage is 0 (S601=No) or the L2 relay RLY_L2, the L3 relay RLY_L3 or the neutral relay RLY_N_A is diagnosed as being in a blown state (operation S602), the relay diagnostic unit 500 may turn on the L3 relay RLY_L3 (operation S603) and may determine whether the L1-L3 line voltage is 0 (operation S604).

[0176] When it is determined in operation S604 that the L1 - L3 line voltage is 0 ( S604 =Yes), the relay diagnosis unit 500 may diagnose the L1 relay RLY_L1 or the pre-charge relay RLY_PreChg as being in an open state (operation S605 ).

[0177] When it is determined in operation S604 that the L1-L3 line voltage is not 0 (S604=No), or when the L1 relay RLY_L1 or the pre-charging relay RLY_PreChg is diagnosed to be in an open circuit state (operation S605), the relay diagnostic unit 500 can disconnect the pre-charging relay RLY_PreChg (operation S606), and can determine whether the difference between the L1 phase voltage and the L3 phase voltage is equal to the L1-L3 line voltage (operation S607).

[0178] When it is determined in operation S607 that the difference between the L1 phase voltage and the L3 phase voltage is equal to the L1 - L3 line voltage ( S607 =Yes), the relay diagnosis unit 500 may diagnose the pre-charging relay RLY_PreChg or the L1 relay RLY_L1 as being in a blown state (operation S608 ).

[0179] When it is determined in operation S607 that the difference between the L1 phase voltage and the L3 phase voltage is not equal to the L1-L3 line voltage (S607=No) or the diagnostic pre-charging relay RLY_PreChg or the L1 relay RLY_L1 is in a blown state (operation S608), the relay diagnostic unit 500 can turn on the L1 relay RLY_L1 (operation S609) and determine whether the difference between the L2 phase voltage and the L3 phase voltage is different from the L2-L3 line voltage (operation S610).

[0180] When it is determined in operation S610 that the difference between the L2 phase voltage and the L3 phase voltage is different from the L2 - L3 line voltage ( S610 =YES), the relay diagnosis unit 500 may diagnose the L1 relay RLY_L1 as an open state (operation S611 ).

[0181] When it is determined in operation S610 that the difference between the L2 phase voltage and the L3 phase voltage is equal to the L2 - L3 line voltage ( S610 =No) or when the diagnosis L1 relay RLY_L1 is in an open state (operation S611 ), the relay diagnosis unit 500 may terminate the relay diagnosis operation.

[0182] According to an exemplary embodiment, when performing relay diagnosis in L1-L3 phase operation, the relay diagnosis unit 500 may sequentially turn on the pre-charge relay, turn on the L3 relay, turn off the pre-charge relay, and turn on the L1 relay, thereby diagnosing the relay.

[0183] When relay diagnostic unit 500 does not directly control the relay, relay diagnostic unit 500 may diagnose the relay based on voltages measured when the pre-charge relay is turned on, the L3 relay is turned on, the pre-charge relay is turned off, and the L1 relay is turned on in sequence.

[0184] According to an implementation of the method for diagnosing relays, the relay diagnostic unit 500 can diagnose the open circuit state and the fused state of the L1 relay RLY_L1, the open circuit state and the fused state of the pre-charge relay RLY_PreChg, the open circuit state and the fused state of the L3 relay RLY_L3, the open circuit state of the L2 relay RLY_L2, and the fused state of the neutral relay RLY_N_A for the relays in the vehicle OBC performing the L1-L3 phase operation.

[0185] According to an exemplary embodiment, when it is determined that an abnormality is diagnosed (diagnosis of a blown state or diagnosis of an open circuit) while diagnosing the relay, the relay diagnostic unit 500 may terminate the diagnostic operation without performing a process after determining that the abnormality is diagnosed.

[0186] For example, for Figure 6 In the method embodiment, when it is determined in operation S605 that the L1 relay RLY_L1 or the pre-charge relay RLY_PreChg is diagnosed as open according to the determination in operation S604, the relay diagnostic unit 500 may terminate the diagnostic operation without performing subsequent diagnostic processing (operations S606 to S611).

[0187] Figure 7 and Figure 8 An embodiment of a method for diagnosing a relay in a vehicle OBC performing three-phase operation is shown.

[0188] See also Figure 7 and Figure 8 Embodiments of a method for diagnosing a relay in an OBC of a vehicle performing three-phase operation are described. Figure 7 and Figure 8 , a method implementation performed by the relay diagnostic unit (or relay diagnostic device) 500 is described, but the method implementation may be performed by the controller 600 .

[0189] First (refer to Figure 7 and Figure 8 ), the relay diagnostic unit 500 may turn on the pre-charge relay RLY_PreChg (operation S700), and may determine whether the L1-L3 line voltage is not 0 (operation S701).

[0190] When it is determined in operation S701 that the L1 - L3 line voltage is not 0 ( S701 =Yes), the relay diagnosis unit 500 may diagnose the L2 relay RLY_L2 , the L3 relay RLY_L3 , or the neutral relay RLY_N_A as being in a fused state (operation S702 ).

[0191] When it is determined in operation S701 that the L1-L3 line voltage is 0 (S701=No) or the L2 relay RLY_L2, the L3 relay RLY_L3 or the neutral relay RLY_N_A is diagnosed as being in a blown state (operation S702), the relay diagnostic unit 500 may turn on the L3 relay RLY_L3 (operation S703) and may determine whether the L1-L3 line voltage is 0 (operation S704).

[0192] When it is determined in operation S704 that the L1 - L3 line voltage is 0 ( S704 =Yes), the relay diagnosis unit 500 may diagnose the L1 relay RLY_L1 , the L2 relay RLY_L2 , or the pre-charge relay RLY_PreChg as being in an open state (operation S705 ).

[0193] When it is determined in operation S704 that the L1-L3 line voltage is not 0 (S704=No), or when the L1 relay RLY_L1, the L2 relay RLY_L2, or the pre-charging relay RLY_PreChg is diagnosed to be in an open state (operation S705), the relay diagnostic unit 500 can determine whether the difference between the L1 phase voltage and the L3 phase voltage is equal to the L2-L3 line voltage (operation S706).

[0194] When it is determined in operation S706 that the difference between the L1 phase voltage and the L3 phase voltage is equal to the L2 - L3 line voltage ( S706 =Yes), the relay diagnosis unit 500 may diagnose the L1 - L2 relay RLY_L1_L2 as being in a blown state (operation S707 ).

[0195] When it is determined in operation S706 that the difference between the L1 phase voltage and the L3 phase voltage is different from the L2-L3 line voltage (S706=No) or the L1-L2 relay RLY_L1_L2 is diagnosed as being in a blown state (operation S707), the relay diagnostic unit 500 can disconnect the pre-charging relay RLY_PreChg (operation S708) and can determine whether the difference between the L1 phase voltage and the L3 phase voltage is equal to the L1-L3 line voltage (operation S709).

[0196] When it is determined in operation S709 that the difference between the L1 phase voltage and the L3 phase voltage is equal to the L1 - L3 line voltage ( S709 =Yes), the relay diagnosis unit 500 may diagnose the pre-charging relay RLY_PreChg or the L1 relay RLY_L1 as being in a blown state (operation S710 ).

[0197] When it is determined in operation S709 that the difference between the L1 phase voltage and the L3 phase voltage is different from the L1-L3 line voltage (S709=No) or the pre-charging relay RLY_PreChg or the L1 relay RLY_L1 is diagnosed as being in a blown state (operation S710), the relay diagnostic unit 500 can determine whether the difference between the L2 phase voltage and the L3 phase voltage is equal to the L2-L3 line voltage (operation S711).

[0198] When it is determined in operation S711 that the difference between the L2 phase voltage and the L3 phase voltage is equal to the L2 - L3 line voltage ( S711 =YES), the relay diagnosis unit 500 may diagnose the L2 relay RLY_L2 as being in a blown state (operation S712 ).

[0199] When it is determined in operation S711 that the difference between the L2 phase voltage and the L3 phase voltage is different from the L2-L3 line voltage (S711=No), or when the L2 relay RLY_L2 is diagnosed to be in a blown state (operation S712), the relay diagnostic unit 500 can connect the L1 relay RLY_L1 and the L2 relay RLY_L2 (operation S713), and can determine whether the difference between the L2 phase voltage and the L3 phase voltage is different from the L2-L3 line voltage (operation S714).

[0200] When it is determined in operation S714 that the difference between the L2 phase voltage and the L3 phase voltage is different from the L2 - L3 line voltage ( S714 =YES), the relay diagnosis unit 500 may diagnose the L1 relay RLY_L1 as an open state (operation S715 ).

[0201] When it is determined in operation S714 that the difference between the L2 phase voltage and the L3 phase voltage is different from the L2-L3 line voltage (S714=No), or when the diagnosis L1 relay RLY_L1 is in an open state (operation S715), the relay diagnostic unit 500 can turn on the L1-L2 relay RLY_L1_L2 (operation S716), and can determine whether the difference between the L2 phase voltage and the L3 phase voltage is different from the L2-L3 line voltage (operation S717).

[0202] When it is determined in operation S717 that the difference between the L2 phase voltage and the L3 phase voltage is different from the L2 - L3 line voltage ( S717 =YES), the relay diagnostic unit 500 may diagnose the L2 relay RLY_L2 as an open state (operation S718 ) and may terminate the relay diagnostic operation.

[0203] When it is determined in operation S717 that the difference between the L2 phase voltage and the L3 phase voltage is equal to the L2 - L3 line voltage ( S717 =No), the relay diagnostic unit 500 may terminate the relay diagnostic operation.

[0204] According to an exemplary embodiment, when performing relay diagnosis in three-phase operation, the relay diagnostic unit 500 may sequentially turn on the pre-charge relay, turn on the L3 relay, turn off the pre-charge relay, turn on the L1 relay and the L2 relay, and turn on the L1_L2 relay, thereby diagnosing the relay.

[0205] When the relay diagnostic unit 500 does not directly control the relay, the relay diagnostic unit 500 may diagnose the relay based on voltages measured when sequentially turning on the pre-charge relay, turning on the L3 relay, turning off the pre-charge relay, turning on the L1 relay and the L2 relay, and turning on the L1_L2 relay.

[0206] According to an implementation of the method for diagnosing relays, the relay diagnostic unit 500 can diagnose the open circuit state and the fused state of the pre-charging relay RLY_PreChg, the open circuit state and the fused state of the L1 relay RLY_L1, the open circuit state and the fused state of the L2 relay RLY_L2, the open circuit state and the fused state of the L3 relay RLY_L3, the fused state of the L1_L2 relay RLY_L1_L2, and the fused state of the neutral relay RLY_N_A for the relays in the vehicle OBC performing three-phase operation.

[0207] According to an exemplary embodiment, when it is determined that an abnormality is diagnosed (diagnosis of a blown state or diagnosis of an open circuit) while diagnosing the relay, the relay diagnostic unit 500 may terminate the diagnostic operation without performing a process after determining that the abnormality is diagnosed.

[0208] For example, for Figure 7 and Figure 8 According to the method embodiment, when it is determined in operation S707 that the L1_L2 relay RLY_L1_L2 is diagnosed as being blown according to the determination in operation S706, the relay diagnostic unit 500 may terminate the diagnostic operation without performing subsequent diagnostic processing (operations S708 to S718).

[0209] As described above, using the method for diagnosing relays in a vehicle OBC according to an exemplary embodiment of the present disclosure makes it possible to diagnose relays in a vehicle OBC that performs single-phase (L1 phase) operation, relays in a vehicle OBC that performs L1-L2 phase operation, relays in a vehicle OBC that performs L1-L3 phase operation, and relays in a vehicle OBC that performs three-phase operation.

[0210] Items diagnosed using the method for diagnosing a relay in a vehicle OBC according to an exemplary embodiment of the present disclosure are listed in Table 2.

[0211] Table 2

[0212]

[0213]

[0214] Although the embodiments of the present disclosure have been described above with reference to the accompanying drawings, the present disclosure is not necessarily limited to these embodiments, and various modifications and changes may be made thereto without departing from the technical concept of the present disclosure. Therefore, the embodiments disclosed herein are not intended to necessarily limit the technical concept of the present disclosure, but are intended to illustrate the technical concept of the present disclosure, and the scope of the technical concept of the present disclosure is not necessarily limited by these embodiments. Therefore, the embodiments described above should be interpreted as illustrative rather than restrictive. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for diagnosing a relay in a vehicle on-board charger (OBC), the device being a device for diagnosing a relay circuit unit located in the vehicle on-board charger, and the relay circuit unit comprises a plurality of relays, the device for diagnosing a relay in a vehicle on-board charger (OBC) comprising: first to third voltage sensors, each of the first to third voltage sensors configured to measure a phase-specific voltage for an alternating current (AC) input to the relay circuit unit; a fourth voltage sensor and a fifth voltage sensor, each of the fourth to fifth voltage sensors being configured to measure a line voltage for an alternating current (AC) output from the relay circuit unit; as well as A diagnosis module is configured to diagnose the relay circuit unit based on the phase-specific voltages measured by the first to third voltage sensors and based on the line voltages measured by the fourth and fifth voltage sensors.

2. The device according to claim 1, wherein: The first to third voltage sensors are configured to measure voltages of L1 to L3 phases input through the first to third AC input terminals, respectively. wherein the fourth voltage sensor is configured to measure an L1-L3 line voltage between an L1 phase output through a first AC output terminal of the relay circuit unit and an L3 phase output through a third AC output terminal of the relay circuit unit, and The fifth voltage sensor is configured to measure an L2-L3 line voltage between an L2 phase output through a second AC output terminal of the relay circuit unit and an L3 phase output through a third AC output terminal of the relay circuit unit.

3. The apparatus according to claim 1, further comprising: A first alternating current (AC) input terminal configured to input an L1 phase voltage; A second alternating current (AC) input terminal configured to input an L2 phase voltage; a third alternating current (AC) input terminal configured to input an L3 phase voltage; a first alternating current (AC) output terminal of the relay circuit unit, the first alternating current (AC) output terminal being configured to output the L1 phase voltage; a second alternating current (AC) output terminal of the relay circuit unit, the second alternating current (AC) output terminal being configured to output the L1 phase voltage or the L2 phase voltage; as well as a third alternating current (AC) output terminal of the relay circuit unit, the third alternating current (AC) output terminal being configured to output the L3 phase voltage or a ground input, Wherein, the relay circuit unit comprises: a pre-charging relay and an L1 relay, wherein the pre-charging relay and the L1 relay are coupled in parallel between the first alternating current (AC) input terminal and the first alternating current (AC) output terminal, An L1-L2 relay is coupled between the first AC input terminal and the second AC output terminal, L2 relay, coupled between the second AC input terminal and the second AC output terminal, an L3 relay coupled between the third AC input terminal and the third AC output terminal, and A neutral relay is coupled between a ground terminal and the third alternating current (AC) output terminal.

4. The device according to claim 1, wherein: The diagnostic module is configured to perform one or any combination of the following: relay diagnostics in L1 phase operation, relay diagnostics in L1-L2 phase operation, relay diagnostics in L1-L3 phase operation, relay diagnostics in three-phase operation.

5. The device according to claim 3, wherein: The diagnostic module is configured to diagnose: the open circuit state and the fused state of the neutral relay, the open circuit state and the fused state of the L1 relay, the open circuit state and the fused state of the pre-charge relay, and the open circuit state and the fused state of the L1-L2 relay by performing relay diagnosis in L1 phase operation.

6. The device according to claim 3, wherein: The diagnostic module is configured to diagnose: the open circuit state and the fused state of the pre-charging relay, the open circuit state and the fused state of the L1 relay, the open circuit state and the fused state of the L2 relay, the fused state of the neutral relay, and the fused state of the L1-L2 relay by performing relay diagnosis in the L1-L2 phase operation.

7. The device according to claim 3, wherein: The diagnostic module is configured to diagnose: the open circuit state and the fused state of the L1 relay, the open circuit state and the fused state of the pre-charging relay, the open circuit state and the fused state of the L3 relay, the open circuit state of the L2 relay, and the fused state of the neutral relay by performing relay diagnosis in the L1-L3 phase operation.

8. The device according to claim 3, wherein: The diagnostic module is configured to diagnose by performing relay diagnosis in three-phase operation: the open circuit state and the blown state of the pre-charging relay, the open circuit state and the blown state of the L1 relay, the open circuit state and the blown state of the L2 relay, the open circuit state and the blown state of the L3 relay, the blown state of the L1-L2 relay, and the blown state of the neutral relay.

9. The device according to claim 3, wherein: The diagnostic module is configured to perform relay diagnosis in L1 phase operation based on voltages measured in the following situations: first, the pre-charging relay is turned on, second, the neutral relay is turned on, third, the pre-charging relay is turned off, fourth, the L1 relay is turned on, and fifth, the L1-L2 relay is turned on.

10. The device according to claim 3, wherein: The diagnostic module is configured to perform relay diagnosis in L1-L2 phase operation based on voltages measured in the following situations: first, the pre-charge relay is turned on, second, the L2 relay is turned on, third, the pre-charge relay is turned off, and fourth, the L1 relay is turned on.

11. The device according to claim 3, wherein: The diagnostic module is configured to perform relay diagnosis in L1-L3 phase operation based on voltages measured in the following situations: first, the pre-charge relay is turned on, second, the L3 relay is turned on, third, the pre-charge relay is turned off, and fourth, the L1 relay is turned on.

12. The device according to claim 3, wherein: The diagnostic module is configured to perform relay diagnosis in three-phase operation based on the voltage measured in the following situations: first, the pre-charge relay is turned on, second, the L3 relay is turned on, third, the pre-charge relay is turned off, fourth, the L1 relay and the L2 relay are turned on, and fifth, the L1-L2 relay is turned on.

13. A method for diagnosing a relay circuit unit in an on-board charger (OBC) of a vehicle, the method comprising: measuring a phase-specific voltage for an alternating current (AC) input to the relay circuit unit by using first to third voltage sensors; measuring a line voltage for an alternating current (AC) output from the relay circuit unit by using a fourth voltage sensor and a fifth voltage sensor; as well as The relay circuit unit is diagnosed based on the phase-specific voltages measured by the first to third voltage sensors and based on the line voltages measured by the fourth and fifth voltage sensors.

14. The method according to claim 13, comprising: Based on the phase voltage and the line voltage, one or any combination of the following items is performed: relay diagnosis in L1 phase operation, relay diagnosis in L1-L2 phase operation, relay diagnosis in L1-L3 phase operation, relay diagnosis in three-phase operation.

15. The method according to claim 13, wherein: When relay diagnosis is performed in L1 phase operation, relay diagnosis is performed based on the voltage measured in the following cases: first, the pre-charging relay is turned on, second, the neutral relay is turned on, third, the pre-charging relay is turned off, fourth, the L1 relay is turned on, and fifth, the L1-L2 relay is turned on.

16. The method according to claim 13, wherein: When the relay diagnosis is performed in the L1-L2 phase operation, the relay diagnosis is performed based on the voltage measured when: first, the pre-charge relay is turned on, second, the L2 relay is turned on, third, the pre-charge relay is turned off, and fourth, the L1 relay is turned on.

17. The method according to claim 13, wherein: When relay diagnosis is performed in L1-L3 phase operation, relay diagnosis is performed based on voltages measured when: first, the pre-charge relay is turned on, second, the L3 relay is turned on, third, the pre-charge relay is turned off, and fourth, the L1 relay is turned on.

18. The method according to claim 13, wherein: When performing relay diagnosis in three-phase operation, relay diagnosis is performed based on the voltage measured in the following cases: first, the pre-charging relay is turned on, second, the L3 relay is turned on, third, the pre-charging relay is turned off, fourth, the L1 relay and the L2 relay are turned on, and fifth, the L1-L2 relay is turned on.

19. A battery charging device comprising: An input circuit comprising a relay circuit unit located in an on-board charger (OBC) of a vehicle, wherein the relay circuit unit comprises a plurality of relays; and a relay diagnosis unit configured to diagnose the relay circuit unit, Wherein, the relay diagnostic unit comprises: a first voltage sensor configured to measure a first phase-specific voltage for a first alternating current (AC) input to the relay circuit unit, a second voltage sensor configured to measure a second phase-specific voltage for a second alternating current (AC) input to the relay circuit unit, a third voltage sensor configured to measure a third phase-specific voltage for a third alternating current (AC) input to the relay circuit unit, a fourth voltage sensor configured to measure a first line voltage for a first alternating current (AC) output from the relay circuit unit, a fifth voltage sensor configured to measure a second line voltage for a second alternating current (AC) output from the relay circuit unit; and A diagnosis module is configured to diagnose the relay circuit unit based on the phase-specific voltages measured by the first to third voltage sensors and based on the line voltages measured by the fourth and fifth voltage sensors.

20. The apparatus of claim 19, wherein: The relay diagnosis unit is configured to perform diagnosis based on a voltage measured by controlling operations of the plurality of relays in the relay circuit unit.

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