Power conversion apparatus for electric vehicle and method of operating same
By introducing relay circuits and power factor correction circuits into the power conversion device of electric vehicles, automatic adaptation and power supply to different power types are achieved, and the problem of poor power compatibility in the prior art is solved, the circuit structure is simplified and the cost is reduced.
Patent Information
- Application Number
- CN202311582897.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-08-04
- Filing Date
- 2023-11-24
- Publication Date
- 2025-02-14
AI Technical Summary
The power conversion devices of existing electric vehicles are difficult to compatible with power supply types and port types in different countries, resulting in complex circuit structures and increased costs.
Design a power conversion device that can automatically detect and adapt different types of power supplies through relay circuits and power factor correction circuits, supply power to loads using asymmetric power supplies or symmetric power supplies, and achieve symmetry and asymmetry through a minimum number of electrical components Compatibility of power ports.
The flexibility of powering the loads of different types of power supplies is achieved, the circuit structure is simplified, the cost is reduced, and it is compatible with symmetric and asymmetric power ports in various countries.
Smart Images
Figure CN119428260A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a power conversion device for an electric vehicle and an operating method thereof. Background Art
[0002] In order to drive an electric vehicle (EV), an on-board charger (OBC) for charging a high-voltage battery using commercial alternating current (AC) power is provided in the electric vehicle.
[0003] Generally, the OBC includes a power factor correction circuit (PFC) that corrects the power factor of commercial AC power and a DC-DC converter that converts the power into a voltage required by a high-voltage battery.
[0004] Recently, there is a need to develop a vehicle-to-grid (V2G) or vehicle-to-load (V2L) technology for supplying energy stored in a high-voltage battery provided in an electric vehicle to a system or an electric load.
[0005] Therefore, it is necessary to provide the electric vehicle with not only a charger for simply charging the battery but also a circuit for various power conversions such as a circuit for realizing V2G or V2L.
[0006] In addition, different countries use different types of commercial AC power (for example, Europe: (three-phase) 230VAC / 50Hz; North America: (single-phase) 240VAC / 60Hz; South Korea: (single-phase) 220VAC / 60Hz, etc.), and even in the case of a V2L port, symmetrical power supply (North American 240VAC) and asymmetrical power supply (South Korea / Europe / North America 120VAC) are used. Therefore, a power conversion circuit that can be universally applied to various types of power supplies and ports is needed.
[0007] The demand for electric vehicles is increasing, and when various power conversion circuits are separately provided in electric vehicles to meet various needs, a large number of electrical components are required to implement the various power conversion circuits, so there may be a problem that the circuit structure becomes complicated and the cost of implementing the circuit increases.
[0008] These background technologies are technical information mastered by the inventors to derive the embodiments of the present invention, or technical information obtained in the process of deriving the embodiments of the present invention, and are not necessarily regarded as known technologies disclosed to the public before submitting this application. Summary of the invention
[0009] The present invention relates to a power conversion device for an electric vehicle and an operating method thereof. Specific embodiments relate to a power conversion device for an electric vehicle capable of supplying power to loads using different types of power supplies and an operating method thereof.
[0010] The disclosed embodiments are made in response to the above-mentioned demand, and embodiments of the present invention provide a power conversion apparatus for an electric vehicle capable of supplying power to loads using different types of power sources and an operating method thereof.
[0011] Furthermore, embodiments of the present invention provide a power conversion apparatus for an electric vehicle and an operating method thereof that can achieve power conversion for supplying power to symmetrical power outlets and asymmetrical power outlets of various countries using a minimum number of electrical components.
[0012] The technical objectives of the embodiments of the present invention are not limited to the above matters. Through the following description, ordinary technicians in the field to which the present invention belongs can clearly understand other objectives to be achieved by the embodiments of the present invention.
[0013] As a technical means for achieving the above-mentioned object, a power conversion device for an electric vehicle and an operating method thereof that can supply power to loads using different types of power supplies can be provided.
[0014] According to an embodiment of the present invention, the above and other purposes can be achieved by providing a power conversion device for an electric vehicle, which includes: a battery; a relay circuit connected to a charging / discharging port via a first power line; a power factor correction circuit connected to the relay circuit via a second power line between the relay circuit and the battery; a discharge port connected to a branch line branching from each second power line; and a controller configured to control the relay circuit and the power factor correction circuit so that power from the battery is supplied to a load using an asymmetric power supply or a load using a symmetric power supply connected to the discharge port.
[0015] According to an embodiment, the second power line may include (2-1)th to (2-3)th power lines, and the branch lines may include first to third branch lines respectively connected to the (2-1)th to (2-3)th power lines.
[0016] According to an embodiment, the discharge port may include a positive (+) terminal connected to the first branch line, a negative (−) terminal connected to the second branch line, and a neutral terminal connected to the third branch line.
[0017] According to an embodiment, a positive (+) voltage may be supplied to the (2-1)th power line, a negative (-) voltage may be supplied to the (2-2)th power line, and a zero voltage may be supplied to the (2-3)th power line.
[0018] According to an embodiment, a load using an asymmetrical power supply may be connected to a positive (+) terminal and a neutral terminal.
[0019] According to an embodiment, a load using an asymmetrical power supply may be connected to a negative (-) terminal and a neutral terminal.
[0020] According to an embodiment, a load using a symmetrical power supply may be connected to a positive (+) terminal, a negative (-) terminal, and a neutral terminal.
[0021] According to an embodiment, the relay circuit may include: an L1 relay connected to the (2-1)th power line; an L1-L2 relay and an L2 relay connected in parallel to the (2-2)th power line; and an L3 relay and a neutral point relay connected in parallel to the (2-3)th power line.
[0022] According to an embodiment, the power factor correction circuit may include: a first branch connected to a (2-1)th power line; a second branch connected to a (2-2)th power line; and a third branch connected to a (2-3)th power line.
[0023] According to an embodiment, when a load using an asymmetric power supply is connected to the discharge port, the controller can turn off the L1 relay, the L1-L2 relay, the L2 relay, the L3 relay and the neutral point relay, and control the first branch to the third branch so that a positive (+) voltage is supplied to the (2-1) power line, or a negative (-) voltage is supplied to the (2-2) power line.
[0024] According to an embodiment, when a load using an asymmetric power supply is connected to the discharge port, the controller can turn on the L1 relay, the L1-L2 relay and the neutral point relay, turn off the L2 relay and the L3 relay, and control the first branch to the third branch so that a positive (+) voltage is supplied to the (2-1) power line, or a negative (-) voltage is supplied to the (2-2) power line.
[0025] According to an embodiment, the charging / discharging port may include an L1 terminal connected to the L1 relay and the L1-L2 relay through the (1-1) power line and a neutral terminal connected to the neutral point relay through the (1-2) power line, and when a load external to the vehicle is connected to the L1 terminal and the neutral terminal, a positive (+) voltage supplied to the (2-1) power line may be supplied to the L1 terminal, or a negative (-) voltage supplied to the (2-2) power line may be supplied to the L1 terminal, thereby simultaneously supplying power to a load using an asymmetric power supply and a load external to the vehicle.
[0026] According to an embodiment, when a load using a symmetrical power supply is connected to the discharge port, the controller can turn off the L1 relay, the L1-L2 relay, the L2 relay, the L3 relay and the neutral point relay, and perform PWM control on the first branch to the third branch, so that a positive (+) voltage is supplied to the (2-1) power line, a negative (-) voltage is supplied to the (2-2) power line, and a zero voltage is supplied to the (2-3) power line.
[0027] According to an embodiment, when a load using a symmetrical power supply is connected to the discharge port, the controller can turn on the L1 relay and the neutral point relay, turn off the L1-L2 relay, the L2 relay and the L3 relay, and perform PWM control on the first branch to the third branch, so that a positive (+) voltage is supplied to the (2-1) power line, a negative (-) voltage is supplied to the (2-2) power line, and a zero voltage is supplied to the (2-3) power line.
[0028] According to an embodiment, the charging / discharging port may include an L1 terminal connected to the L1 relay and the L1-L2 relay through the (1-1) power line and a neutral terminal connected to the neutral point relay through the (1-2) power line, and when a load external to the vehicle is connected to the L1 terminal and the neutral terminal, a positive (+) voltage supplied to the (2-1) power line may be supplied to the L1 terminal, and a zero voltage supplied to the (2-3) power line may be supplied to the neutral terminal, thereby simultaneously supplying power to a load using a symmetrical power supply and a load external to the vehicle.
[0029] According to another embodiment of the present invention, there is provided an operating method for a power conversion device for an electric vehicle, the method comprising: detecting whether a charging / discharging port is connected to a load external to the vehicle or whether a discharging port is connected to a load internal to the vehicle; when the discharging port is connected to a load internal to the vehicle, determining whether the load internal to the vehicle is a load using an asymmetric power supply or a load using a symmetric power supply; when the load internal to the vehicle is a load using an asymmetric power supply, supplying an asymmetric power supply to the load using the asymmetric power supply based on the power of a battery; and when the load internal to the vehicle is a load using a symmetric power supply, supplying a symmetric power supply to the load using a symmetric power supply based on the power of the battery.
[0030] According to an embodiment, supplying the asymmetric power may include supplying a positive (+) voltage and a zero voltage to the load using the asymmetric power when the load using the asymmetric power is connected to a positive (+) terminal and a neutral terminal of the discharge port.
[0031] According to an embodiment, supplying the asymmetric power may include supplying a negative (-) voltage and a zero voltage to the load using the asymmetric power when the load using the asymmetric power is connected to a negative (-) terminal and a neutral terminal of the discharge port.
[0032] According to an embodiment, supplying the symmetrical power may include supplying a positive (+) voltage, a negative (−) voltage, and a zero voltage to a load using the symmetrical power.
[0033] According to an embodiment, an operating method of a power conversion device for an electric vehicle may include supplying positive (+) voltage and zero voltage to the vehicle external load and the load using an asymmetric power supply when a charging / discharging port is connected to the vehicle external load and a discharging port is connected to the load using an asymmetric power supply.
[0034] According to an embodiment, an operating method of a power conversion device for an electric vehicle may include supplying a negative (-) voltage and a zero voltage to the external load of the vehicle and the load using an asymmetric power supply when a charging / discharging port is connected to the external load of the vehicle and a discharging port is connected to the load using an asymmetric power supply.
[0035] According to an embodiment, an operating method of a power conversion device for an electric vehicle may include: when a charging / discharging port is connected to a load external to the vehicle and a discharging port is connected to a load using a symmetrical power supply, supplying a positive (+) voltage and a zero voltage to the load external to the vehicle, and supplying a positive (+) voltage, a negative (-) voltage, and a zero voltage to the load using a symmetrical power supply.
[0036] In addition to the above-mentioned means for solving the problems, specific details of various embodiments according to the present invention are contained in the following description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0037] The above and other purposes, features and other advantages of the embodiments of the present invention will be more clearly understood through the following detailed description in conjunction with the accompanying drawings, in which:
[0038] Figure 1 is a diagram showing a configuration of a power conversion device for an electric vehicle according to an embodiment of the present invention;
[0039] Figure 2 is a diagram showing a configuration of a relay circuit according to an embodiment of the present invention;
[0040] Figure 3 is a diagram showing a configuration of a power factor correction circuit according to an embodiment of the present invention;
[0041] Figure 4 is a diagram for describing the operation of the power conversion device for an electric vehicle according to an embodiment of the present invention;
[0042] Figure 5 is a diagram showing a power path in the case where a battery is charged using a power conversion device for an electric vehicle according to an embodiment of the present invention;
[0043] Figure 6 is a diagram showing a power path in the case where power is supplied to a load external to the vehicle using a power conversion device for an electric vehicle according to an embodiment of the present invention; and
[0044] Figure 7 : is a diagram showing a power path in the case where power is supplied to a vehicle internal load using a power conversion device for an electric vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION
[0045] The advantages and features of the embodiments of the present invention and the methods for achieving these advantages and features will become apparent with reference to the embodiments described in detail below in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be embodied in a variety of different forms. On the contrary, these exemplary embodiments are provided to make this disclosure comprehensive and complete and to fully convey the scope of the present invention to those skilled in the art. Therefore, the scope of the embodiments of the present invention should be defined by the claims.
[0046] The shapes, sizes, proportions, angles, quantities, etc. shown in the accompanying drawings for illustrating the embodiments of the present invention are given only by way of example, and therefore, the embodiments of the present invention are not limited to the contents shown in the drawings. The same reference numerals will be used to refer to the same or very similar elements throughout the accompanying drawings. In addition, in the description of the embodiments of the present invention, when the detailed description of the relevant known technology may make the subject matter of the embodiments of the present invention quite unclear, the detailed description will be omitted. In this specification, when the terms "including", "comprising" and the like are used, other elements may be added unless the word "only" is used. Unless the context clearly indicates otherwise, the elements described in the singular are intended to include multiple elements.
[0047] In explaining constituent elements included in various embodiments of the present invention, even if not explicitly stated, the constituent elements are interpreted to include a range of error.
[0048] In the description of various embodiments of the present invention, when describing the time relationship, for example, when using "after", "subsequently", "next", "before", etc. to describe the time relationship between two actions, unless the term "directly" or "just" is used, the actions may not occur continuously.
[0049] In the description of various embodiments of the present invention, although terms such as "first" and "second" may be used to describe various elements, these terms are only used to distinguish elements that are identical or similar to each other. Therefore, in this specification, unless otherwise mentioned, within the technical scope of the present invention, an element modified by "first" may be the same as an element modified by "second".
[0050] It will be understood that although the terms first, second, A, B, (a), (b), etc. may be used herein to describe various elements of embodiments of the present invention, these terms are only used to distinguish one element from another element, and the necessity, order or sequence of the corresponding elements are not limited by these terms. It will be understood that when an element is referred to as being "connected to", "coupled to" or "accessed to" another element, although an element may be directly connected to or may be directly accessed to another element, an element may be "connected to", "coupled to" or "accessed to" another element through another element.
[0051] “At least one” should be understood to include all combinations of one or more related elements. For example, “at least one of a first element, a second element, and a third element” refers not only to the first element, the second element, or the third element, but also to all combinations of two or more elements of the first element, the second element, and the third element.
[0052] The respective features of the various embodiments of the present invention may be partially or completely interconnected and combined, and various technical linkages and drives are also possible. These different embodiments may be performed independently of each other or in association with each other.
[0053] The embodiments of the present invention will be described below by means of drawings and examples. Since the proportions of components shown in the drawings are different from those of actual components for the convenience of description, the proportions are not limited to those shown in the drawings.
[0054] Hereinafter, a power conversion device for an electric vehicle and an operating method thereof according to an embodiment of the present invention will be described with reference to the accompanying drawings.
[0055] Figure 1 is a diagram showing a configuration of a power conversion device 1 for an electric vehicle according to an embodiment of the present invention.
[0056] Reference Figure 1 , the power conversion device 1 for an electric vehicle according to an embodiment of the present invention may be a bidirectional on-board charger (OBC) mounted on the electric vehicle.
[0057] The power conversion device 1 for an electric vehicle according to the present embodiment may include a relay circuit 100 , a power factor correction circuit (PFC) 200 , a DC-DC converter 300 , and a controller 400 .
[0058] The relay circuit 100 can be connected to the charging / discharging port (or charging / discharging port or external V2L port) 10, can provide power supplied through the charging / discharging port 10 to the power factor correction circuit 200, and can provide power supplied from the power factor correction circuit 200 to the charging / discharging port 10.
[0059] The charge / discharge port 10 may support a battery charging mode and a battery discharging mode.
[0060] When an AC power source is connected to the charging / discharging port 10 (charging mode), the relay circuit 100 can provide power supplied from the AC power source to the power factor correction circuit 200. For example, the AC power source may be a single-phase AC power source or a three-phase AC power source.
[0061] When a load is connected to the charging / discharging port 10 (discharging mode), the relay circuit 100 can provide the charging / discharging port 10 with power supplied from the power factor correction circuit 200. A load located outside the electric vehicle can be connected to the charging / discharging port 10, and the load connected to the charging / discharging port 10 can be referred to as a "vehicle external load".
[0062] The charging / discharging port 10 may include a first terminal L1 , a second terminal L2 , a third terminal L3 , and a neutral terminal N. As shown in FIG.
[0063] In the charging mode, the L1 phase AC voltage may be input to the first terminal L1, the L2 phase AC voltage may be input to the second terminal L2, and the L3 phase AC voltage may be input to the third terminal L3. In the discharging mode, the load may be connected to the first terminal L1 and the neutral terminal N.
[0064] The relay circuit 100 may be provided between the charging / discharging port 10 and the power factor correction circuit 200 , and may include a plurality of relays that are turned on / off in response to the control of the controller 400 .
[0065] The relay circuit 100 may transmit power supplied from the charging / discharging port 10 to the power factor correction circuit 200 , and transmit power supplied from the power factor correction circuit 200 to the charging / discharging port 10 .
[0066] The relay circuit 100 may be connected to the charging / discharging port 10 through a plurality of first power lines PL_11 , PL_12 , PL_13 , and NL, and may be connected to the power factor correction circuit 200 through a plurality of second power lines PL_21 , PL_22 , and PL_23 .
[0067] Here, the plurality of first power lines may include a (1-1)th power line PL_11 connected to the first terminal L1, a (1-2)th power line PL_12 connected to the second terminal L2, a (1-3)th power line PL_13 connected to the third terminal L3, and a neutral line NL connected to the neutral terminal N.
[0068] In addition, the plurality of second power lines may include a (2-1)th power line PL_21, a (2-2)th power line PL_22, and a (2-3)th power line PL_23.
[0069] The power factor correction circuit 200 may be disposed between the relay circuit 100 and the DC-DC converter 300, may convert the AC voltage transmitted from the relay circuit 100 into a DC voltage, may output the DC voltage, and may simultaneously correct the power factor of the voltage.
[0070] That is, the power factor correction circuit 200 performs a rectification function of converting an AC voltage into a DC voltage, and can increase a power factor by reducing a phase difference between an input current and an input voltage.
[0071] In addition, the power factor correction circuit 200 may supply the relay circuit 100 with a voltage provided from the DC-DC converter 300 .
[0072] The discharge port (or discharge port) 20 may be connected between the relay circuit 100 and the power factor correction circuit 200 through a branch line BL.
[0073] For example, the discharge port (or in-vehicle V2L port) 20 may be provided inside the electric vehicle, and a load connected to the discharge port 20 may be referred to as a “vehicle interior load”.
[0074] The discharge port 20 may include a first terminal A, a second terminal B, and a neutral terminal N'. Here, the first terminal A may be a positive (+) terminal, and the second terminal B may be a negative (-) terminal.
[0075] The first terminal A may be connected to the (2-1)th power line PL_21 via the first branch line BL_1, the second terminal B may be connected to the (2-2)th power line PL_22 via the second branch line BL_2, and the neutral terminal N' may be connected to the (2-3)th power line PL_23 via the third branch line BL_3.
[0076] That is, the first branch line BL_1 can connect the first terminal A and the (2-1)th power line PL_21, the second branch line BL_2 can connect the second terminal B and the (2-2)th power line PL_22, and the third branch line BL_3 can connect the neutral terminal N' and the (2-3)th power line PL_23.
[0077] The DC-DC converter 300 is provided between the power factor correction circuit 200 and the battery 30 , and may convert a voltage provided from the power factor correction circuit 200 in response to control of the controller 400 , and supply the converted voltage to the battery 30 .
[0078] In addition, the DC-DC converter 300 may convert a voltage provided from the battery 30 in response to the control of the controller 400 and supply the converted voltage to the power factor correction circuit 200 .
[0079] The controller 400 may cause the electric vehicle power conversion device 1 to perform a battery charging mode in which the battery 30 is charged based on an external AC power source and a discharging mode in which power of the battery 30 is output to the charging / discharging port 10 or the discharging port 20 .
[0080] For example, a three-phase AC power source or a single-phase AC power source may be used as the external AC power source.
[0081] The battery discharge mode may include a first battery discharge mode in which the power of the battery 30 is output to the charge / discharge port 10 and a second discharge mode in which the power of the battery 30 is output to the discharge port 20 .
[0082] When AC power is connected to the charging / discharging port 10 , the controller 400 may control the relay circuit 100 , the power factor correction circuit 200 , and the DC-DC converter 300 so that the battery 30 is charged based on the AC power.
[0083] When a vehicle external load is connected to the charging / discharging port 10 , the controller 400 may control the relay circuit 100 , the power factor correction circuit 200 , and the DC-DC converter 300 so that power of the battery 30 is supplied to the vehicle external load connected to the charging / discharging port 10 .
[0084] For example, the vehicle external load may be connected to the first terminal L1 and the neutral terminal N, but embodiments of the present invention are not limited thereto.
[0085] When a vehicle interior load is connected to the discharge port 20 , the controller 400 may control the relay circuit 100 , the power factor correction circuit 200 , and the DC-DC converter 300 so that power of the battery 30 is supplied to the vehicle interior load connected to the discharge port 20 .
[0086] For example, the vehicle internal load may be connected to the first terminal A and the neutral terminal N′, may be connected to the second terminal B and the neutral terminal N′, or may be connected to the first terminal A, the second terminal B, and the neutral terminal N′.
[0087] The vehicle internal load connected to the discharge port 20 may be a load using an asymmetrical power supply or a load using a symmetrical power supply.
[0088] The load using an asymmetrical power supply may be a load that operates by receiving a positive (+) voltage (e.g., +120 V) and 0 V, or a load that operates by receiving a negative (-) voltage (e.g., -120 V) and 0 V. In addition, the load using a symmetrical power supply may be a load that operates by receiving a positive (+) voltage (e.g., +120 V), a negative (-) voltage (e.g., -120 V), and 0 V.
[0089] The controller 400 may control the relay circuit 100 and the power factor correction circuit 200 according to whether a load using an asymmetrical power supply or a load using a symmetrical power supply is connected to the discharge port 20 .
[0090] According to an embodiment, the controller 400 may be implemented to detect whether a load is connected to the charging / discharging port 10 and the discharging port 20 .
[0091] To this end, a cable connection detection sensor for each terminal may be provided in the charging / discharging port 10 and the discharging port 20. The detection sensor may output a detection signal to the controller 400 when a cable is connected to (or inserted into) the terminal.
[0092] Therefore, the controller 400 can detect (or judge) whether a load is connected to the charging / discharging port 10 and the discharging port 20 based on the detection signal output from the detection sensor, and can detect which terminals of the output terminals 10 and 20 are connected to the load.
[0093] When a load using an asymmetrical power source is connected to the discharge port 20 , the controller 400 may control the relay circuit 100 and the power factor correction circuit 200 so that the asymmetrical power source is supplied to the load.
[0094] Furthermore, when a load using a symmetrical power source is connected to the discharge port 20 , the controller 400 may control the relay circuit 100 and the power factor correction circuit 200 so that the symmetrical power source is provided to the load.
[0095] According to an embodiment, the first filter 500 may be connected between the charging / discharging port 10 and the relay circuit 100 , and the second filter 600 may be connected between the relay circuit 100 and the power factor correction circuit 200 .
[0096] The first filter 500 may remove electrical noise included in the AC voltage transmitted from the charging / discharging port 10 , and the second filter 600 may remove electrical noise included in the AC voltage transmitted from the relay circuit 100 .
[0097] Figure 2 is a diagram showing a configuration of a relay circuit 100 according to an embodiment of the present invention.
[0098] Reference Figure 1 and Figure 2 The relay circuit 100 according to the embodiment of the present invention may include a pre-charging relay RLY_Pre, 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 point relay RLY_N, but the configuration of the relay circuit 100 is not limited thereto.
[0099] The pre-charging relay RLY_Pre, the L1 relay RLY_L1, the L1-L2 relay RLY_L1_L2, the L2 relay RLY_L2, the L3 relay RLY_L3, and the neutral point relay RLY_N may be controlled by the controller 400.
[0100] The pre-charging relay RLY_Pre may be connected in series between the (1-1)th power line PL_11 and the (2-1)th power line PL_21 connected to the first terminal L1, and the L1 relay RLY_L1 may be connected in series between the (1-1)th power line PL_11 and the (2-1)th power line PL_21 connected to the first terminal L1.
[0101] Therefore, the pre-charge relay RLY_Pre and the L1 relay RLY_L1 may be connected in parallel between the (1-1)th power line PL_11 and the (2-1)th power line PL_21.
[0102] The L1-L2 relay RLY_L1_L2 may be connected in series between the (1-1)th power line PL_11 and the (2-2)th power line PL_22, and the L2 relay RLY_L2 may be connected in series between the (1-2)th power line PL_12 and the (2-2)th power line PL_22.
[0103] In this way, one end of the L1-L2 relay RLY_L1_L2 can be connected to the (1-1) power line PL_11, one end of the L2 relay RLY_L2 can be connected to the (1-2) power line PL_12, and the other end of the relay RLY_L1_L2 and the other end of the L2 relay RLY_L2 can be commonly connected to the (2-2) power line PL_22.
[0104] Therefore, the L1-L2 relay RLY_L1_L2 and the L2 relay RLY_2 may be connected in parallel to the (2-2)th power line PL_22.
[0105] The L3 relay RLY_L3 may be connected in series between the (1-3)th power line PL_13 and the (2-3)th power line PL_23, and the neutral point relay RLY_N may be connected between the neutral line NL and the (2-3)th power line PL_23.
[0106] One end of the L3 relay RLY_L3 can be connected to the (1-3)th power line PL_13, one end of the neutral point relay RLY_N can be connected to the neutral line NL, and the other end of the L3 relay RLY_L3 and the other end of the neutral point relay RLY_N can be commonly connected to the (2-3)th power line PL_23.
[0107] Therefore, the L3 relay RLY_L3 and the neutral point relay RLY_N may be connected in parallel to the (2-3)th power line PL_23.
[0108] Figure 3is a diagram showing a configuration of a power factor correction circuit 200 according to an embodiment of the present invention.
[0109] Reference Figures 1 to 3 According to an embodiment of the present invention, the power factor correction circuit 200 may include first to third input inductors Lg1, Lg2 and Lg3, a DC capacitor Cdc and first to third branches L11, L12 and L13, but the configuration of the power factor correction circuit 200 is not limited thereto.
[0110] One end of the first input inductor Lg1 may be connected to the (2-1)th power line PL_21, and the other end of the first input inductor Lg1 may be connected to the first branch L11. One end of the second input inductor Lg2 may be connected to the (2-2)th power line PL_22, and the other end of the second input inductor Lg2 may be connected to the second branch L12. One end of the third input inductor Lg3 may be connected to the (2-3)th power line PL_23, and the other end of the third input inductor Lg3 may be connected to the third branch L13.
[0111] A DC capacitor Cdc may be connected in parallel between the first DC link D1 and the second DC link D2. A DC capacitor Cdc may be connected in parallel to the first to third branches L11, L12, and L13.
[0112] The first branch L11 may include two switching elements SW1 and SW2 connected in series between the first DC link D1 and the second DC link D2 , and may be connected to the (2-1)th power line PL_21 through a first input inductor Lg1 .
[0113] The second branch L12 may include two switching elements SW3 and SW4 connected in series between the first DC link D1 and the second DC link D2 , and may be connected to the (2-2)th power line PL_22 through a second input inductor Lg2 .
[0114] The third branch L13 may include two switching elements SW5 and SW6 connected in series between the first DC link D1 and the second DC link D2 , and may be connected to the (2-3)th power line PL_23 through a third input inductor Lg3 .
[0115] The other end of the first input inductor Lg1 may be connected between the first switching element SW1 and the second switching element SW2. The other end of the second input inductor Lg2 may be connected between the third switching element SW3 and the fourth switching element SW4. The other end of the third input inductor Lg3 may be connected between the fifth switching element SW5 and the sixth switching element SW6.
[0116] The first to sixth switching elements SW1 to SW6 of the power factor correction circuit 200 may be controlled by the controller 400 .
[0117] Figure 4 is a diagram for describing the operation of the power conversion device for an electric vehicle according to an embodiment of the present invention. Figure 5 is a diagram showing a power path in the case where a battery is charged using a power conversion device for an electric vehicle according to an embodiment of the present invention. Figure 6 : is a diagram showing a power path in the case where power is supplied to a load external to the vehicle using the power conversion device for an electric vehicle according to an embodiment of the present invention. Figure 7 : is a diagram showing a power path in the case where power is supplied to a vehicle internal load using a power conversion device for an electric vehicle according to an embodiment of the present invention.
[0118] Figure 4 The step-by-step instructions can be found in Figures 1 to 3 The power conversion device 1 for an electric vehicle is implemented.
[0119] Will refer to Figures 1 to 7 The operation of the power conversion device 1 for an electric vehicle is described, focusing on the control of the controller 400 .
[0120] First, the controller 400 may detect whether a power source or a load is connected to the charging / discharging port 10 and the discharging port 20 ( S400 ).
[0121] In step S400 , the controller 400 may detect whether the charging / discharging port 10 and the discharging port 20 are connected to a power source or a load based on a detection signal of a cable connection detection sensor of each terminal provided in the charging / discharging port 10 and the discharging port 20 .
[0122] When the controller 400 detects that the charging / discharging port 10 is connected to a power source (S410), Figure 5 As shown, the battery 30 may be charged based on the power source connected to the charging / discharging port 10 (S420).
[0123] For example, the power source connected to the charging / discharging port 10 may be a three-phase AC power source or a single-phase AC power source.
[0124] Control of charging the battery 30 with the external AC power source through the power conversion device may be performed by various methods known in the art.
[0125] For example, the controller 400 may turn on the L1 relay RLY_L1 , the L2 relay RLY_L2 , and the L3 relay RLY_L3 , and may control (or switch) the first branch L11 , the second branch L12 , and the third branch L13 of the power factor correction circuit 200 , so that the battery 30 is charged based on the three-phase AC voltage.
[0126] When the controller 400 detects that a load (“vehicle external load”) is connected to the charging / discharging port 10 (S430), as Figure 6 As shown, the power of the battery 30 may be supplied to the load connected to the charging / discharging port 10 (S440).
[0127] In step S440 , the controller 400 may turn on the L1 relay RLY_L1 , the L1-L2 relay RLY_L1_L2 , and the neutral point relay RLY_N, and turn off the L2 relay RLY_L2 and the L3 relay RLY_L3 .
[0128] Therefore, the (1-1)th power line PL_11 and the (2-1)th power line PL_21 can be connected, and the neutral line NL and the (2-3)th power line PL_23 can be connected. According to this connection relationship, the first terminal L1 of the charging / discharging port 10 and the first branch L11 of the power factor correction circuit 200 can be connected, and the neutral terminal N of the charging / discharging port 10 and the third branch L13 of the power factor correction circuit 200 can be connected.
[0129] In this way, when the charging / discharging port 10 and the power factor correction circuit 200 are connected according to the operation of the relay circuit 100, the controller 400 can control (or switch) the first branch L11 and the third branch L13 of the power factor correction circuit 200 so that the power of the battery 30 is output to the charging / discharging port 10.
[0130] Here, the controller 400 may perform single-phase totem-pole control on the first branch L11 and the third branch L13 .
[0131] Since the first branch line BL_1 is connected to the (2-1)th power line PL_21 and the third branch line BL_3 is connected to the (2-3)th power line PL_23, if a load is connected to the first terminal A and the neutral terminal N' of the discharge port 20, the power of the battery 30 can also be supplied to the load.
[0132] That is, when the L1 relay RLY_L1, the L1-L2 relay RLY_L1_L2 and the neutral point relay RLY_N are turned on, and the L2 relay RLY_L2 and the L3 relay RLY_L3 are turned off, power of the battery 30 can be supplied to the load connected to the charging / discharging port 10 and the load connected to the first terminal A and the neutral terminal N' of the discharging port 20.
[0133] When the controller 400 detects that a load ("vehicle internal load") is connected to the discharge port 20 (S450), Figure 7 As shown, the power of the battery 30 may be supplied to the load connected to the discharge port 20 .
[0134] Here, the controller 400 may determine whether the load connected to the discharge port 20 is a load using an asymmetrical power supply or a load using a symmetrical power supply (S460).
[0135] In step S460 , the controller 400 may determine whether the load is connected to the first terminal A and the neutral terminal N′, whether the load is connected to the second terminal B and the neutral terminal N′, or whether the load is connected to the first terminal A, the second terminal B, and the neutral terminal N′.
[0136] Here, when the load is connected to the first terminal A and the neutral terminal N′ of the discharge port 20 or to the second terminal B and the neutral terminal N′ of the discharge port 20 , the controller 400 may determine that the load connected to the discharge port 20 is a load using an asymmetric power supply.
[0137] When the load is connected to the first terminal A, the second terminal B, and the neutral terminal N′, the controller 400 may determine that the load connected to the discharge port 20 is a load using a symmetrical power supply.
[0138] When it is determined that the load is a load using an asymmetrical power supply ( S470 ), the controller 400 may control the relay circuit 100 and the power factor correction circuit 200 so that an asymmetrical power supply is provided to the load ( S480 ).
[0139] In step S480 , the controller 400 may turn off all of the L1 relay RLY_L1 , the L1-L2 relay RLY_L1_L2 , the L2 relay RLY_L2 , the L3 relay RLY_L3 , and the neutral point relay RLY_N.
[0140] Therefore, power from the battery 30 is cut off by the relay circuit 100 and thus is not supplied to the charging / discharging port 10 , while power from the battery 30 may be supplied to the discharging port 20 through the branch lines BL_1 , BL_2 , and BL_3 connected to the second power lines PL_21 , PL_22 , and PL_23 .
[0141] Therefore, the power of the battery 30 can be supplied to the load connected to the discharge port 20, and a load using asymmetrical power or a load using symmetrical power can be used as the load.
[0142] A load using an asymmetrical power supply may be connected to the first terminal A (+ terminal) and the neutral terminal N′ of the discharge port 20 , or may be connected to the second terminal B (− terminal) and the neutral terminal N′ of the discharge port 20 .
[0143] A load using a symmetrical power supply may be connected to the first terminal A (+ terminal), the second terminal B (− terminal), and the neutral terminal N′ of the discharge port 20 .
[0144] In the case where a load using an asymmetrical power source is connected to the discharge port 20, the controller 400 may perform single-phase totem pole control on the first to third branches L11, L12, and L13 of the power factor correction circuit 200. In addition, in the case where a load using a symmetrical power source is connected to the discharge port 20, the controller 400 may perform three-phase pulse width modulation (PWM) control on the first to third branches L11, L12, and L13 of the power factor correction circuit 200.
[0145] When it is determined that the load is a load using symmetrical power ( S490 ), the controller 400 may control the relay circuit 100 and the power factor correction circuit 200 so that symmetrical power is supplied to the load ( S500 ).
[0146] In step S500 , the controller 400 may turn off the L1 relay RLY_L1 , the L1-L2 relay RLY_L1_L2 , the L2 relay RLY_2 , the L3 relay RLY_3 , and the neutral point relay RLY_N.
[0147] Then, the controller 400 can perform PWM control on the first to third branches L11, L12 and L13, so that a positive (+) voltage is supplied to the (2-1)th power line PL_21, a negative (-) voltage is supplied to the (2-2)th power line PL_22, and 0V is supplied to the (2-3)th power line PL_23.
[0148] Therefore, the positive (+) voltage, the negative (−) voltage, and 0V may be supplied to the terminals A, B, and N′ of the discharge port 20 through the branch lines BL_1 , BL_2 , and BL_3 connected to the second power lines PL_21 , PL_22 , and PL_23 .
[0149] In step S500 , the controller 400 may turn on the L1 relay RLY_L1 and the neutral point relay RLY_N, and turn off the L1-L2 relay RLY_L1_L2 , the L2 relay RLY_2 , and the L3 relay RLY_3 .
[0150] Then, the controller 400 can perform PWM control on the first to third branches L11, L12 and L13, so that a positive (+) voltage is supplied to the (2-1)th power line PL_21, a negative (-) voltage is supplied to the (2-2)th power line PL_22, and 0V is supplied to the (2-3)th power line RLY_23.
[0151] When the L1 relay RLY_L1 and the neutral point relay RLY_N are turned on, a positive (+) voltage may be supplied to the L1 terminal L1 of the charging / discharging port 10 , and 0 V may be supplied to the neutral point terminal N of the charging / discharging port 10 .
[0152] Therefore, when a load external to the vehicle is connected to the L1 terminal L1 and the neutral terminal N of the charging / discharging port 10 , the electric power from the battery 30 can be supplied to the load external to the vehicle.
[0153] Therefore, it is possible to simultaneously supply power to the load using the symmetrical power supply connected to the discharge port 20 and the vehicle external load connected to the charge / discharge port 10 .
[0154] According to the power conversion device 1 for electric vehicles and the operating method thereof according to an embodiment of the present invention, when a load using an asymmetric power supply is connected to the positive (+) terminal and the neutral terminal of the discharge port 20, the power conversion device 1 for electric vehicles can provide a positive (+) voltage and a zero voltage to the load using an asymmetric power supply.
[0155] According to an embodiment of the present invention, when a load using an asymmetric power source is connected to the negative (-) terminal and the neutral terminal of the discharge port 20, the power conversion device 1 for an electric vehicle can provide a negative (-) voltage and a zero voltage to the load using an asymmetric power source.
[0156] According to an embodiment of the present invention, the power conversion device 1 for an electric vehicle can provide a positive (+) voltage, a negative (-) voltage, and a zero voltage to a load using a symmetrical power supply.
[0157] According to an embodiment of the present invention, when a vehicle external load is connected to the charging / discharging port 10 and a load using an asymmetric power supply is connected to the discharging port 20, a power conversion device 1 for an electric vehicle can provide positive (+) voltage and zero voltage to the vehicle external load and the load using an asymmetric power supply.
[0158] According to an embodiment of the present invention, when a vehicle external load is connected to the charging / discharging port 10 and a load using an asymmetric power supply is connected to the discharging port 20, a power conversion device 1 for an electric vehicle can provide a negative (-) voltage and a zero voltage to the vehicle external load and the load using an asymmetric power supply.
[0159] According to an embodiment of the present invention, when a load external to the vehicle is connected to the charging / discharging port 10 and a load using a symmetrical power supply is connected to the discharging port 20, the power conversion device 1 for an electric vehicle can provide a positive (+) voltage and a zero voltage to the load external to the vehicle, and can provide a positive (+) voltage, a negative (-) voltage and a zero voltage to the load using a symmetrical power supply.
[0160] The power conversion device 1 for an electric vehicle according to the embodiment of the present invention described above can supply power to various types of loads, such as a vehicle external load, a vehicle internal load using an asymmetrical power supply, and a vehicle internal load using a symmetrical power supply.
[0161] Therefore, the power conversion device 1 for electric vehicles according to the embodiment of the present invention can be applied to symmetrical power ports and asymmetrical power ports, and can be applied to vehicles regardless of the type of power required by each country. In addition, since the power supply of the power conversion device 1 for electric vehicles according to the embodiment of the present invention can be implemented using a relay circuit and a power factor correction circuit, the purpose of the embodiment of the present invention can be achieved using a minimum number of electrical components.
[0162] According to an embodiment of the present invention, a power conversion apparatus for an electric vehicle capable of supplying power to loads using different types of power sources and an operating method thereof can be provided.
[0163] In addition, according to the embodiments of the present invention, a power conversion device for an electric vehicle and an operating method thereof can be provided, which can realize power conversion for supplying power to symmetrical power outlets and asymmetrical power outlets of various countries using a minimum number of electrical components.
[0164] By using the power conversion device for electric vehicles and the operating method thereof according to the embodiments of the present invention, one power conversion device can be used to supply power to a symmetrical power port and an asymmetrical power port, and can supply power to loads using different types of power supplies.
[0165] The effects of the embodiments of the present invention are not limited to the above-mentioned effects, and those skilled in the art will clearly understand other unmentioned effects from the description herein.
[0166] Since the content of the above-mentioned problems to be solved, the means for solving the problems and the effects do not indicate the essential features of the claims, the scope of the claims is not limited by the matters described in the contents of the specification.
[0167] Although the embodiments of the present invention are described in more detail with reference to the accompanying drawings, the embodiments of the present invention are not necessarily limited to these embodiments, and various modifications and implementations may be made to the embodiments of the present invention without departing from the technical spirit of the present invention. Therefore, the embodiments disclosed in this specification are not intended to limit the technical spirit of the present invention, but are used to explain the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments. Therefore, it should be understood that the above-mentioned embodiments are illustrative in all aspects and not restrictive. The scope of protection of the embodiments of the present invention should be interpreted according to the claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the embodiments of the present invention.
Claims
1. A power conversion device for an electric vehicle, comprising: Battery; a relay circuit connected to the charging / discharging port via a first power line; a power factor correction circuit connected to the relay circuit via a second power line between the relay circuit and the battery; a discharge port connected to a branch line branched from each of the second power lines; as well as A controller is configured to control the relay circuit and the power factor correction circuit so that power from the battery is supplied to a load using an asymmetrical power supply or a load using a symmetrical power supply connected to the discharge port.
2. The device according to claim 1, wherein: The second power line includes the (2-1)th power line to the (2-3)th power line; The branch lines include first to third branch lines connected to the (2-1)th power line to the (2-3)th power line, respectively; and The discharge port includes a positive (+) terminal connected to the first branch line, a negative (-) terminal connected to the second branch line, and a neutral terminal connected to the third branch line.
3. The device according to claim 2, wherein: The (2-1)th power line is supplied with a positive (+) voltage, the (2-2)th power line is supplied with a negative (-) voltage, and the (2-3)th power line is supplied with a zero voltage.
4. The device according to claim 2, wherein: A load using an asymmetrical power supply is connected to the positive (+) terminal and the neutral terminal.
5. The device according to claim 2, wherein: A load using an asymmetrical power supply is connected to the negative (-) terminal and the neutral terminal.
6. The device according to claim 2, wherein: A load using a symmetrical power supply is connected to the positive (+) terminal, the negative (-) terminal, and the neutral terminal.
7. The device according to claim 2, wherein: The relay circuit comprises: L1 relay, connected to the (2-1) power line; L1-L2 relay and L2 relay connected in parallel to the (2-2)th power line; and L3 relay and neutral point relay are connected in parallel to the (2-3)th power line; and The power factor correction circuit comprises: A first branch connected to the (2-1)th power line; A second branch connected to the (2-2)th power line; and The third branch is connected to the (2-3)th power line.
8. The device according to claim 7, wherein: In case a load using an asymmetrical power supply is connected to the discharge port, the controller is configured to: turning off the L1 relay, the L1-L2 relay, the L2 relay, the L3 relay and the neutral point relay; and The first branch to the third branch are controlled so that a positive (+) voltage is supplied to the (2-1)th power line, or a negative (-) voltage is supplied to the (2-2)th power line.
9. The device according to claim 7, wherein: In case a load using an asymmetrical power supply is connected to the discharge port, the controller is configured to: Connecting the L1 relay, the L1-L2 relay and the neutral point relay; turning off the L2 relay and the L3 relay; and The first branch to the third branch are controlled so that a positive (+) voltage is supplied to the (2-1)th power line, or a negative (-) voltage is supplied to the (2-2)th power line.
10. The device according to claim 9, wherein: The charging / discharging port includes an L1 terminal connected to the L1 relay and the L1-L2 relay through a (1-1)th power line and a second neutral terminal connected to the neutral point relay through a (1-2)th power line; and When a vehicle external load is connected to the L1 terminal and the second neutral terminal, the positive (+) voltage supplied to the (2-1) power line is supplied to the L1 terminal, or the negative (-) voltage supplied to the (2-2) power line is supplied to the L1 terminal, so that power is supplied to the load using an asymmetric power supply and the vehicle external load at the same time.
11. The device according to claim 7, wherein: In case a load using a symmetrical power supply is connected to the discharge port, the controller is configured to: turning off the L1 relay, the L1-L2 relay, the L2 relay, the L3 relay and the neutral point relay; and Pulse width modulation control is performed on the first branch to the third branch so that a positive (+) voltage is supplied to the (2-1)th power line, a negative (-) voltage is supplied to the (2-2)th power line, and a zero voltage is supplied to the (2-3)th power line.
12. The device according to claim 7, wherein: In case a load using a symmetrical power supply is connected to the discharge port, the controller is configured to: Connecting the L1 relay and the neutral point relay; turning off the L1-L2 relay, the L2 relay, and the L3 relay; and Pulse width modulation control is performed on the first branch to the third branch so that a positive (+) voltage is supplied to the (2-1)th power line, a negative (-) voltage is supplied to the (2-2)th power line, and a zero voltage is supplied to the (2-3)th power line.
13. The device according to claim 12, wherein: The charging / discharging port includes an L1 terminal connected to the L1 relay and the L1-L2 relay through the (1-1)th power line and a second neutral terminal connected to the neutral point relay through the (1-2)th power line; and When a vehicle external load is connected to the L1 terminal and the second neutral terminal, the positive (+) voltage supplied to the (2-1) power line is supplied to the L1 terminal, and the zero voltage supplied to the (2-3) is supplied to the second neutral terminal, so that power is supplied to the load using a symmetrical power supply and the vehicle external load at the same time.
14. A method for operating a power conversion device for an electric vehicle, comprising: Detect whether the charging / discharging port is connected to an external load of the vehicle or whether the discharging port is connected to an internal load of the vehicle; In response to detecting that the discharge port is connected to the vehicle internal load, determining whether the vehicle internal load is a load using an asymmetric power supply or a load using a symmetric power supply; In a case where the vehicle internal load is a load using an asymmetric power supply, supplying the asymmetric power to the load using the asymmetric power supply based on power of a battery; and In a case where the vehicle internal load is a load using a symmetrical power supply, the symmetrical power supply is supplied to the load using the symmetrical power supply based on the power of the battery.
15. The method according to claim 14, wherein: Supplying the asymmetric power includes supplying a positive (+) voltage and a zero voltage to the load using the asymmetric power when the load using the asymmetric power is connected to the positive (+) terminal and the neutral terminal of the discharge port.
16. The method according to claim 14, wherein: Supplying the asymmetric power includes supplying a negative (-) voltage and a zero voltage to the load using the asymmetric power when the load using the asymmetric power is connected to the negative (-) terminal and the neutral terminal of the discharge port.
17. The method according to claim 14, wherein: Supplying the symmetrical power includes supplying a positive (+) voltage, a negative (-) voltage, and a zero voltage to a load using the symmetrical power.
18. The method according to claim 14, further comprising: When the vehicle external load is connected to the charge / discharge port and the load using an asymmetric power source is connected to the discharge port, a positive (+) voltage and a zero voltage are supplied to the vehicle external load and the load using an asymmetric power source.
19. The method of claim 14, further comprising: When the vehicle external load is connected to the charge / discharge port and a load using an asymmetric power source is connected to the discharge port, a negative (-) voltage and a zero voltage are supplied to the vehicle external load and the load using an asymmetric power source.
20. The method of claim 14, further comprising: When the charge / discharge port is connected to the vehicle external load and the discharge port is connected to a load using a symmetrical power supply, a positive (+) voltage and a zero voltage are supplied to the vehicle external load, and the positive (+) voltage, a negative (-) voltage, and the zero voltage are supplied to the load using a symmetrical power supply.