Direct-current charging system for electric vehicle

Abstract

A direct-current charging system for an electric vehicle. The system comprises: a combination of a plurality of parallel-connected power conversion groups, at least one charging output port, and a switching matrix. The combination of the plurality of parallel-connected power conversion groups is used for providing direct-current electric power. The at least one charging output port is switchably and electrically connected to at least one of the busbars. The switching matrix comprises a plurality of first parallel-connected lines, a plurality of second parallel-connected lines, a plurality of first parallel-connected switches and a plurality of second parallel-connected switches, wherein each first parallel-connected line and first parallel-connected switch are switchably and electrically connected to any two busbars in a non-repetitive manner, and each second parallel-connected line and second parallel-connected switch are switchably and electrically connected to busbars of a combination of any two different power conversion groups.

Description

Direct current charging system for electric vehicle TECHNICAL FIELD

[0001] The present disclosure relates to a charging system, in particular to a direct current charging system for electric vehicle. BACKGROUND

[0002] The switching matrix in the prior art usually provides the number of switches as m*n, where m is the number of power conversion modules and n is the number of charging output ports. The number of switches used is large and the architecture is complex, thus leading to the increase of the cost of the charging system.

[0003] In addition, with the expansion of the number of charging guns and power conversion modules, the number of switches required by the system will further increase, thus causing considerable inconvenience in the expansion of the charging system.

[0004] SUMMARY

[0005] To solve the above problems in the prior art, the purpose of the present disclosure is to provide a direct current charging system for electric vehicle, which can effectively solve the problem of cost increase caused by the large number of switching elements used in the prior art.

[0006] To achieve the above purpose, the present disclosure provides a direct current charging system for electric vehicle, comprising: a combination of a plurality of parallel power conversion groups, at least one charging output port, and a switching matrix. The combination of a plurality of parallel power conversion groups is used to provide direct current power, each power conversion group combination comprises a plurality of power conversion module groups, each power conversion module group comprises a plurality of power conversion modules and a bus for transmitting direct current. The at least one charging output port is switchably connected with at least one of the buses. The switching matrix comprises a plurality of first parallel lines, a plurality of second parallel lines, a plurality of first parallel switches and a plurality of second parallel switches. Each first parallel line and first parallel switch is switchably and non-repeatedly connected with any two buses in the same power conversion group combination. The second parallel line and the second parallel switch are switchably connected with the buses of any two different power conversion group combinations.

[0007] In one embodiment of the present disclosure, any bus connected to the at least one charging output port through the second parallel line and the second parallel switch is connected to at most one different power conversion group combination.

[0008] In one embodiment of the present disclosure, only one position between the at least one charging output port and the bus connected switchably is provided with a third switch for controlling whether the at least one charging output port and the bus are connected switchably. The position is provided with only one third switch.

[0009] In one embodiment of the present disclosure, each power conversion module comprises at least one switching rectifier element.

[0010] In one of the embodiments of the present disclosure, the second parallel line is electrically connected to the bus bars in the combination of the different power conversion groups without repeating.

[0011] In one of the embodiments of the present disclosure, the number of the power conversion module groups in each of the power conversion group combinations is the same, the number of the second parallel lines is the same as the number of the bus bars in one of the power conversion group combinations, and the second parallel lines are provided with pluggable connectors between adjacent power conversion group combinations to adjust the number of the parallel power conversion group combinations.

[0012] In one of the embodiments of the present disclosure, one end of each second parallel line in each of the power conversion group combinations is provided with a male connector, and the other end is provided with a female connector, and the second parallel switch on each second parallel line is arranged between the male connector and the female connector of the second parallel line.

[0013] In one of the embodiments of the present disclosure, the number of the power conversion module groups in at least one of the power conversion group combinations is different from the number of the power conversion module groups in the other power conversion group combinations.

[0014] In one of the embodiments of the present disclosure, the number of the charging output ports is different from the number of the bus bars.

[0015] The present disclosure also provides a direct current charging system for electric vehicles, which includes a plurality of parallel power conversion group combinations, at least one charging output port, and a switch matrix. The plurality of parallel power conversion group combinations are used to provide direct current power. Each power conversion group combination includes a plurality of power conversion module groups. Each power conversion module group has a plurality of power conversion modules and a bus bar for transmitting direct current. The at least one charging output port is switchably electrically connected to at least one bus bar. The switch matrix includes a plurality of parallel lines and a plurality of parallel switches. Each bus bar is electrically connected to at least one parallel line, and the parallel line is switchably and non-repetitively electrically connected to different bus bars through the corresponding parallel switch.

[0016] In one of the embodiments of the present disclosure, only one position between the at least one charging output port and the switchably electrically connected bus bar is provided with a switch for controlling whether the at least one charging output port and the bus bar are switchably electrically connected.

[0017] In one of the embodiments of the present disclosure, each power conversion module includes at least one switching rectifier element.

[0018] In one of the embodiments of the present disclosure, the number of the power conversion module groups in at least one of the power conversion group combinations is different from the number of the power conversion module groups in the other power conversion group combinations.

[0019] In one of the embodiments of the present disclosure, the number of charging output ports is the same as the number of bus bars.

[0020] In one of the embodiments of the present disclosure, the plurality of parallel lines includes a plurality of first parallel lines and a plurality of second parallel lines, and the plurality of parallel switches includes a plurality of first parallel switches and a plurality of second parallel switches. Each first parallel line is switchably and non-repeatedly electrically connected to any two bus bars in the combination of the same power conversion group via the first parallel switch, and each second parallel line is switchably electrically connected to the bus bars in the combination of any two different power conversion groups via the second parallel switch.

[0021] Compared with the prior art, the electric vehicle direct current charging system of the present disclosure uses fewer switches, has a simple combination architecture, has a more flexible power output combination form, and uses fewer switches, which not only improves the convenience when the system scale is expanded, but also effectively reduces the cost, avoiding the problems in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0022] FIGS. 1 to 7 are schematic diagrams of circuit structures of electric vehicle direct current charging systems according to different embodiments of the present disclosure.

[0023] BRIEF DESCRIPTION OF DRAWINGS 1, 1a, 1b, 1c, 1d, 1f, 2: electric vehicle direct current charging system 10, 10a, 10b, 10c: combination of power conversion groups 11, G1, G2, G3, G4: power conversion module group 110: power conversion module 12: bus bar 20, C1, C2, C3, C4: charging output port 30: switch matrix 310: parallel line 311: first parallel line 312: second parallel line 320: parallel switch 321, K1, K2: first parallel switch 322, K3, K4: second parallel switch 323, K5, K6, K7, K8: third switch 40: connector 41: male connector 42: female connector P: position S: switch DETAILED DESCRIPTION

[0024] In order to make the above and other objects, features, and advantages of the present disclosure more apparent, preferred embodiments of the present disclosure will be described below with reference to the accompanying drawings. In addition, in the drawings, similar elements are denoted by the same reference numerals.

[0025] Referring to FIG. 1, a circuit structure schematic diagram of a direct current charging system for electric vehicles is shown according to one embodiment of the present disclosure. The present disclosure provides a direct current charging system 1 for electric vehicles, comprising: a plurality of parallel power conversion groups 10, at least one charging output port 20, and a switch matrix 30. The plurality of parallel power conversion groups 10 are used to provide direct current power, each of the parallel power conversion groups 10 comprises a plurality of power conversion module groups 11, each of the power conversion module groups 11 comprises a plurality of power conversion modules 110 and a busbar 12 for transmitting direct current. The at least one charging output port 20 is switchably electrically connected with at least one of the busbars 12. The switch matrix 30 comprises a plurality of first parallel lines 311, a plurality of second parallel lines 312, a plurality of first parallel switches 321, and a plurality of second parallel switches 322, each of the first parallel lines 311 is switchably and non-repeatedly electrically connected with any two busbars 12 in the same parallel power conversion group 10 through the first parallel switch 321 (for example, the switches labeled K1 and K2 in FIG. 1), and each of the second parallel lines 312 is switchably electrically connected with the busbars 12 of any two different parallel power conversion groups 10 through the second parallel switch 322 (for example, the switches labeled K3 and K4 in FIG. 1).

[0026] Specifically, the first parallel switch 321 and the second parallel switch 322 are, for example, relays. The busbar 12 at least comprises a power line and a ground line. The power conversion module 110 is, for example, a rectifier. The charging output port 20 is, for example, a charging gun or a charging socket for electric vehicles.

[0027] In one embodiment of the present disclosure, any busbar 12 switchably electrically connected to the at least one charging output port 20 is connected to at most one different parallel power conversion group 10 through the second parallel line 312 and the second parallel switch 322.

[0028] Specifically, referring to FIG. 1, the busbar 12 switchably electrically connected (through the switch labeled K5) to the at least one charging output port 20 (for example, the charging output port 20 labeled C1) is connected to at most one different parallel power conversion group 10 (for example, the parallel power conversion group 10 at the bottom in FIG. 1) through the second parallel line 312 and the second parallel switch 322 (for example, the switch labeled K3). The busbar 12 switchably electrically connected (through the switch labeled K6) to the at least one charging output port 20 (for example, the charging output port 20 labeled C2) is connected to at most one different parallel power conversion group 10 (for example, the parallel power conversion group 10 at the bottom in FIG. 1) through the second parallel line 312 and the second parallel switch 322 (for example, the switch labeled K4).

[0029] In one of the embodiments of the present disclosure, only one position P is provided between the at least one charging output port 20 and the busbar 12 which is switchably connected to control whether the at least one charging output port 20 is switchably connected to the busbar 12 or not. The position P is provided with only one third switch 323.

[0030] Specifically, referring to FIG. 1, only one position P (for example, the position of the switch numbered K5) is provided between the at least one charging output port 20 (for example, the charging output port 20 numbered C1) and the busbar 12 which is switchably connected to control whether the at least one charging output port 20 is switchably connected to the busbar 12 or not. The position P is provided with only one third switch 323 (for example, the switch numbered K5).

[0031] In one of the embodiments of the present disclosure, each of the power conversion modules 110 includes at least one switching mode rectifier (SMR), also known as a high-frequency switching rectifier. The switching mode rectifier converts an alternating current power supply into a direct current power supply, which can be designed to meet the power supply of an electric vehicle charging device, and has a wide range of applications. The switching mode rectifier provides quiet, high-reliability direct current power, and has the characteristics of small size, light weight, and easy operation. The switching mode rectifier is a full-featured high-frequency switching rectifier that can be powered alone or in parallel. In a parallel system, the central monitoring module (CSU) performs overall monitoring, and has the characteristics of current optimal load sharing, accurate stable voltage, battery charging current limiting, automatic battery charging, battery temperature compensation, and the like.

[0032] In one of the embodiments of the present disclosure, the second parallel line 312 and the second parallel switch 322 are not repeatedly connected to the busbar 12 in any two different power conversion group combinations 10.

[0033] Specifically, referring to FIG. 1, the second parallel line 312 and the second parallel switch 322 (for example, the switch numbered K3) are not repeatedly connected to the busbar 12 (for example, the busbar 12 connected to the power conversion module groups 11 numbered G1, G3 in FIG. 1) in any two different power conversion group combinations 10 (for example, the power conversion group combination 10 on the top and the power conversion group combination 10 on the bottom in FIG. 1). The second parallel line 312 and the second parallel switch 322 (for example, the switch numbered K4) are not repeatedly connected to the busbar 12 (for example, the busbar 12 connected to the power conversion module groups 11 numbered G2, G4 in FIG. 1) in any two different power conversion group combinations 10 (for example, the power conversion group combination 10 on the top and the power conversion group combination 10 on the bottom in FIG. 1).

[0034] The electric vehicle direct current charging system 1 of one embodiment of the present disclosure can switch the switches in the switch switching matrix 30 to appropriately distribute the power of the power conversion module groups 11 to the charging output ports 20 according to different charging conditions. Specifically, the operation of the switch switching matrix 30 is explained below with reference to FIG. 1. For ease of explanation, FIG. 1 numbers the power conversion module groups 11 as G1 to G4, numbers the first parallel switches 321 as K1 to K2, numbers the second parallel switches 322 as K3 to K4, numbers the charging output ports 20 as C1 to C4, and numbers the third switches 323 as K5 to K8.

[0035] When the charging condition is single output full power, the third switch K5 and the first parallel switch K1 are turned on (ON) with respect to the charging output port C1, and any two of the first parallel switch K2 and the second parallel switches K3 to K4 are turned on (ON), so that the power of all the power conversion module groups G1 to G4 is applied to the charging output port C1.

[0036] When the charging condition is double output equal power, the third switches K5 and K6 and the second parallel switches K3 and K4 are turned on (ON) with respect to the charging output ports C1 and C2. At this time, the output power of the charging output port C1 is provided by the power conversion module groups G1 and G3, and the output power of the charging output port C2 is provided by the power conversion module groups G2 and G4.

[0037] When the charging condition is double output unequal power, the third switches K5 and K6, the first parallel switch K2, and the second parallel switch K3 are turned on (ON) with respect to the charging output port C1 having a larger power than the charging output port C2. At this time, the output power of the charging output port C1 is provided by the power conversion module groups G1, G3, and G4, and the output power of the charging output port C2 is provided by the power conversion module group G2.

[0038] When the charging condition is double output unequal power, the third switches K5 and K6, the first parallel switch K2, and the second parallel switch K4 are turned on (ON) with respect to the charging output port C1 having a smaller power than the charging output port C2. At this time, the output power of the charging output port C1 is provided by the power conversion module group G1, and the output power of the charging output port C2 is provided by the power conversion module groups G2, G3, and G4.

[0039] Specifically, the total number of the first parallel switches 321, the second parallel switches 322, and the third switches 323 can be calculated by the following equation: where N is the number of busbars in the combination 10 of one power conversion group, X is the total number of the power conversion module groups 11 in the electric vehicle direct current charging system 1, and Y is the total number of the charging output ports 20.

[0040] Referring to FIG. 2 and FIG. 3, the circuit structure diagrams of the electric vehicle DC charging system according to the embodiments of the present disclosure are shown. The main difference between the electric vehicle DC charging system 1a of FIG. 2 and the electric vehicle DC charging system 1 of FIG. 1 is that the electric vehicle DC charging system 1a of FIG. 2 is provided with two charging output ports 20, while the electric vehicle DC charging system 1 of FIG. 1 is provided with four charging output ports 20. The main difference between the electric vehicle DC charging system 1b of FIG. 3 and the electric vehicle DC charging system 1 of FIG. 1 is that the electric vehicle DC charging system 1b of FIG. 3 is connected with three power conversion group combinations 10, while the electric vehicle DC charging system 1 of FIG. 1 is connected with two power conversion group combinations 10.

[0041] Referring to FIG. 4, the circuit structure diagram of the electric vehicle DC charging system according to one of the embodiments of the present disclosure is shown. In one of the embodiments of the present disclosure, the number of the power conversion module groups 11 in each power conversion group combination 10 is the same, the number of the second bus bars 312 is the same as the number of the bus bars 12 in one of the power conversion group combinations 10, and the second bus bar 312 is provided with a pluggable connector 40 between adjacent power conversion group combinations 10, so as to adjust the number of the connected power conversion group combinations 10.

[0042] Referring to FIG. 4, in one of the embodiments of the present disclosure, one end of each second bus bar 312 of each power conversion group combination 10 is provided with a male connector 41, and the other end is provided with a female connector 42. The second bus switch 322 on each second bus bar 312 is arranged between the male connector 41 and the female connector 42 of the second bus bar 312.

[0043] Specifically, one male connector 41 and one female connector 42 can be combined to form a pluggable connector 40. The present disclosure does not limit the specific types of the male connector 41 and the female connector 42. The solid line frame of the power conversion group combination 10 shown in FIG. 4 can be regarded as a board, a frame, or a shell. The male connector 41 and the female connector 42 are arranged on the board, the frame, or the shell of the power conversion group combination 10 to facilitate quick installation or expansion.

[0044] In one of the embodiments of the present disclosure, the number of the power conversion module groups 11 in at least one of the power conversion group combinations 10 is different from the number of the power conversion module groups 11 in the other power conversion group combinations 10. Specifically, the present disclosure does not limit the number of the power conversion module groups 11 in the power conversion group combination 10, and the number of the power conversion module groups 11 in the power conversion group combination 10 can be the same or different.

[0045] Referring to FIG. 5 and FIG. 6, they show the circuit structure schematic diagrams of the electric vehicle direct current charging system according to the embodiments of the present disclosure. In one of the embodiments of the present disclosure, the number of the charging output ports 20 is different from the number of the bus bars 12. The main difference between the electric vehicle direct current charging system Id of FIG. 5 and the electric vehicle direct current charging system 1 of FIG. 1 is that the electric vehicle direct current charging system Id of FIG. 5 connects three power conversion group combinations 10, and each power conversion group combination 10 includes four power conversion module groups 11, while the electric vehicle direct current charging system 1 of FIG. 1 connects two power conversion group combinations 10, and each power conversion group combination 10 includes two power conversion module groups 11. The electric vehicle direct current charging system If of FIG. 6 and the electric vehicle direct current charging system Id of FIG. 5 both connect three power conversion group combinations 10, and each power conversion group combination 10 includes four power conversion module groups 11. The difference is that the electric vehicle direct current charging system Id of FIG. 5 is provided with four charging output ports 20, and the electric vehicle direct current charging system If of FIG. 6 is provided with eight charging output ports 20.

[0046] Referring to FIG. 7, it shows the circuit structure schematic diagram of the electric vehicle direct current charging system according to one of the embodiments of the present disclosure. The present disclosure provides an electric vehicle direct current charging system 2, which includes a plurality of connected power conversion group combinations 10, at least one charging output port 20, and a switch switching matrix 30. The plurality of connected power conversion group combinations 10 are used to provide direct current power. Each power conversion group combination 10 includes a plurality of power conversion module groups 11. Each power conversion module group 11 has a plurality of power conversion modules 110 and a bus bar 12 for transmitting direct current. The at least one charging output port 20 is switchably connected with at least one bus bar 12. The switch switching matrix 30 includes a plurality of connection lines 310 and a plurality of connection switches 320. Each bus bar 12 is connected with at least one connection line 310, and the connection line 310 is switchably and non-repeatedly connected with different bus bars 12 through the corresponding connection switch 320.

[0047] Specifically, the connection lines between any two bus bars 12 in FIG. 7 are all connection lines 310. For the sake of simplicity, only one connection line 310 is marked in FIG. 7. The switch on the connection line 310 is the connection switch 320. Similarly, for the sake of simplicity, only one connection switch 320 is marked in FIG. 7. As shown in FIG. 7, each bus bar 12 is connected with at least one connection line 310, and the connection line 310 is non-repeatedly connected with different bus bars 12.

[0048] In one of the embodiments of the present disclosure, only one position P for controlling the switchable connection between the at least one charging output port 20 and the bus bar 12 is provided, and the position P is provided with only one switch S.

[0049] Specifically, as shown in FIG. 7, only one position P (i.e. the position of the uppermost switch S in FIG. 7) is provided between the at least one charging output port 20 (e.g. the uppermost charging output port 20 in FIG. 7) and the busbar 12 (e.g. the uppermost busbar 12 in FIG. 7) which is switchably connected to the at least one charging output port 20, and the position P is provided with one switch S.

[0050] In one embodiment of the present disclosure, each power conversion module 110 includes at least one switching rectifier element.

[0051] In one embodiment of the present disclosure, the number of power conversion module groups 11 in at least one power conversion group combination 10 is different from the number of power conversion module groups 11 in other power conversion group combinations 10.

[0052] Specifically, as shown in FIG. 7, the number of power conversion module groups 11 in the power conversion group combination 10c is 2, which is different from the number of power conversion module groups 11 in the power conversion group combinations 10a or 10b which is 4.

[0053] In one embodiment of the present disclosure, the number of charging output ports 20 is the same as the number of busbars 12. Specifically, as shown in FIG. 7, the number of charging output ports 20 is 10, which is the same as the number of busbars 12.

[0054] Referring to FIG. 7 and FIG. 1, in one embodiment of the present disclosure, the plurality of parallel wires 310 includes a plurality of first parallel wires 311 and a plurality of second parallel wires 312, and the plurality of parallel switches 320 includes a plurality of first parallel switches 321 and a plurality of second parallel switches 322, each first parallel wire 311 is switchably and non-repeatedly connected to any two busbars 12 in the same power conversion group combination via a first parallel switch 321, and each second parallel wire 312 is switchably connected to any two busbars 12 in different power conversion group combinations via a second parallel switch 322.

[0055] In one embodiment of the present disclosure, the plurality of parallel wires includes a plurality of first parallel wires and a plurality of second parallel wires, and the plurality of parallel switches includes a plurality of first parallel switches and a plurality of second parallel switches, each first parallel wire is switchably and non-repeatedly connected to any two busbars in the same power conversion group combination via a first parallel switch, and each second parallel wire is switchably connected to any two busbars in different power conversion group combinations via a second parallel switch.

[0056] Compared with the prior art, the disclosed electric vehicle direct current charging system uses fewer switches, has a simple combined architecture, has a more flexible power output combination form, and uses fewer switches, which not only improves the convenience when the system scale is expanded, but also effectively reduces the cost, and avoids the problems in the prior art.

[0057] The above describes the features of the disclosure through preferred embodiments, the purpose of which is to enable those skilled in the art to understand the content of the disclosure and implement it, rather than limit the present application, so that equivalent modifications or modifications made without departing from the technical concept disclosed in the present application should still be included in the claims below.

Claims

1. A direct current charging system for electric vehicles, comprising: a plurality of parallel power conversion clusters for providing direct current power, each power conversion cluster comprising a plurality of power conversion module clusters, each power conversion module cluster comprising a plurality of power conversion modules and a bus bar for transmitting direct current; at least one charging output port switchably connected to at least one of the bus bars; and a switch matrix comprising a plurality of first parallel lines, a plurality of second parallel lines, a plurality of first parallel switches and a plurality of second parallel switches, each first parallel line and first parallel switch switchably and non-repeatedly connecting any two bus bars in the same power conversion cluster, the second parallel lines and the second parallel switches switchably connecting bus bars in different power conversion clusters.

2. The electric vehicle DC charging system of claim 1, wherein, Any bus bar switchably connected to the at least one charging output port is connected to at most one bus bar in a different power conversion cluster through a second parallel line and a second parallel switch.

3. The electric vehicle DC charging system of claim 1, wherein, There is only one position for controlling the switchable connection between the at least one charging output port and the bus bar, and the position is provided with only one third switch.

4. The electric vehicle DC charging system of claim 1, wherein, Each power conversion module comprises at least one switching rectifier element.

5. The electric vehicle DC charging system of claim 1, wherein, The second parallel lines and the second parallel switches non-repeatedly connect bus bars in different power conversion clusters.

6. The electric vehicle DC charging system of claim 1, wherein, The number of power conversion module clusters in each power conversion cluster is the same, the number of second parallel lines is the same as the number of bus bars in one of the power conversion clusters, and the second parallel lines are provided with pluggable connectors between adjacent power conversion clusters for adjusting the number of parallel power conversion clusters.

7. The electric vehicle DC charging system of claim 6, wherein, Each second parallel line is provided with a male connector at one end and a female connector at the other end, and the second parallel switch on each second parallel line is arranged between the male connector and the female connector of the second parallel line.

8. The electric vehicle DC charging system of claim 1, wherein, The number of power conversion module clusters in at least one power conversion cluster is different from the number of power conversion module clusters in other power conversion clusters.

9. The electric vehicle DC charging system of claim 1, wherein, The number of charging output ports is different from the number of bus bars.

10. A direct current charging system for electric vehicles, comprising: a plurality of parallel power conversion clusters for providing direct current power, each power conversion cluster comprising a plurality of power conversion module clusters, each power conversion module cluster comprising a plurality of power conversion modules and a bus bar for transmitting direct current; at least one charging output port switchably connected to at least one of the bus bars; and a switch matrix comprising a plurality of parallel lines and a plurality of parallel switches, wherein each bus bar is connected to at least one parallel line, and the parallel lines and the corresponding parallel switches are switchably and non-repeatedly connected to different bus bars.

11. The electric vehicle DC charging system of claim 10, wherein only one position is provided between the at least one charging output port and the bus bar to which the at least one charging output port is switchably electrically connected, and the position is provided with only one switch.

12. The electric vehicle DC charging system of claim 10, wherein each of the power conversion modules comprises at least one switching rectifier element.

13. The electric vehicle DC charging system of claim 10, wherein, The number of power conversion module groups in the combination of at least one power conversion group is different from the number of power conversion module groups in the combination of other power conversion groups.

14. The electric vehicle DC charging system of claim 10, wherein, The number of charging output ports is the same as the number of bus bars.

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