Four-section direct-current output power distribution system for direct-current charging pile

Abstract

The utility model relates to the field of charging piles, in particular to a four-section direct current output power distribution system for a direct current charging pile, which comprises a first output end, a second output end, at least four power supply groups and a plurality of direct current contactors K. The plurality of power supply groups are connected in series between the first output end and the second output end. The first output end and the second output end are respectively used for supplying power to the two charging guns, the power supply groups are used for receiving current input rectified by the rectifier, and the direct current contactor K is connected in series between the adjacent power supply groups so as to control the connection and disconnection between the power supply groups. The power regulation circuit has the effect of freer power regulation.

Description

Technical Field

[0001] The present application relates to the field of charging piles, and in particular to a four-segment DC output power distribution system for a DC charging pile. Background Art

[0002] With the development of the new energy industry, the market share of new energy vehicles in the automobile market is also increasing. After several years of development, it has occupied more than 30% of the entire automobile market. What follows is the continuous improvement of supporting equipment, including public charging stations. Public charging stations require rectifiers, charging piles and other equipment. Because the new energy vehicle market is in the early stages of competition, there is no unified standard for specifications. And because new energy vehicles are developing very rapidly, the performance of newly released new energy vehicles will increase every year, from 7kW to 37.5kW now. Some DC charging piles can even reach a charging power of 200kW. The DC output structure of DC charging piles on the market usually has only a two-stage structure. When a single gun is charging, only two gears can be adjusted. When both charging guns on the charging pile are in charging state, power adjustment cannot be performed. Utility Model Content

[0003] In order to improve the problem that power adjustment cannot be performed when both charging guns are in charging state, the present application provides a four-stage DC output power distribution system for a DC charging pile.

[0004] This application provides a four-stage DC output power distribution system for a DC charging pile, which adopts the following technical solutions:

[0005] A four-stage DC output power distribution system for a DC charging pile includes a first output end, a second output end, at least four power supply groups and multiple DC contactors K. The multiple power supply groups are connected in series between the first output end and the second output end. The first output end and the second output end are used to power two charging guns respectively. The power supply groups are used to receive current input after rectification by a rectifier. The DC contactors K are connected in series between adjacent power supply groups to control the on-off between the power supply groups.

[0006] By adopting the above technical solution, through four power supply groups and DC contactor K, at least four-speed adjustment of single-gun output can be achieved, and when two guns are outputting at the same time, two-speed adjustment of two guns or even three-speed adjustment can be achieved, which improves the accuracy of power regulation and greatly improves energy utilization efficiency.

[0007] Optionally, the power supply group comprises a plurality of copper bar assemblies and a plurality of input terminals, the plurality of copper bar assemblies are connected in series between the first output terminal and the second output terminal, the DC contactor K is connected in series between adjacent copper bar assemblies, and the input terminals are used for receiving current input of the rectifier and are electrically connected to the corresponding copper bar assemblies.

[0008] By adopting the above technical solution, the current input of the rectifier and the current circulation between the copper bar assemblies are facilitated by the copper bar assemblies, and the on-off control between the copper bar assemblies is realized by the DC contactor K between the copper bar assemblies.

[0009] Optionally, the copper bar assembly comprises a first copper bar group, a second copper bar group, a third copper bar group and a fourth copper bar group, the first copper bar group is connected in series between the first output terminal and the second copper bar group, the third copper bar group is connected in series between the second copper bar group and the fourth copper bar group, and the fourth copper bar group is connected in series to the second output terminal.

[0010] By adopting the above technical solution, the number of the copper bar assemblies connected in series is controlled by the DC contactor K, so as to realize the adjustment of the gear.

[0011] Optionally, the copper bar assembly further comprises a fifth copper bar group, the fifth copper bar group is electrically connected between the first copper bar group and the fourth copper bar group, the DC contactor K comprises a first DC contact group electrically connected to the fifth copper bar group, and the first DC contact group is used for controlling the on-off of the fifth copper bar group.

[0012] By adopting the above technical solution, when the heat of the second copper bar group and the third copper bar group is high, the heat of the second copper bar group and the third copper bar group is reduced by the fifth copper bar group.

[0013] Optionally, the copper bar assembly further comprises a sixth copper bar group, the sixth copper bar group is electrically connected between the third copper bar group and the fifth copper bar group, the DC contactor K comprises a second DC contact group electrically connected to the sixth copper bar group, and the second DC contact group is used for controlling the on-off of the third copper bar group.

[0014] By adopting the above technical solution, when only the temperature of the second copper bar group is too high, the first copper bar group is directly communicated with the third copper bar group by the sixth copper bar group and the fifth copper bar group, the second copper bar group is skipped, and the temperature of the second copper bar group is reduced.

[0015] Optionally, the copper bar assembly further comprises a seventh copper bar group, the seventh copper bar group is electrically connected between the second copper bar group and the fifth copper bar group, the DC contactor K comprises a third DC contact group electrically connected to the seventh copper bar group, and the third DC contact group is used for controlling the on-off of the seventh copper bar group.

[0016] By adopting the technical scheme, when only the temperature of the third copper bar group is too high, the second copper bar group is directly communicated with the fourth copper bar group through the seventh copper bar group and the fifth copper bar group, and the third copper bar group is skipped, so that the temperature of the third copper bar group is reduced.

[0017] Optionally, the sixth copper bar group is electrically connected to the fifth copper bar group at a position where the first direct current contact group is close to the fourth copper bar group, and the seventh copper bar group is electrically connected to the fifth copper bar group at a position where the first direct current contact group is close to the first copper bar group.

[0018] By adopting the technical scheme, the current flowing from the fifth copper bar group to the fourth copper bar group through the sixth copper bar group, or the current flowing from the fifth copper bar group to the first copper bar group through the seventh copper bar group is reduced.

[0019] Optionally, the temperature monitoring module is further electrically connected to the third copper bar group to detect the temperature of the third copper bar group and output a corresponding control signal to control the on-off of the direct current contactor K.

[0020] By adopting the technical scheme, the temperature monitoring module controls the direct current contactor K, so that the change of the current flow direction is automatically realized to protect the second copper bar group.

[0021] Optionally, the temperature monitoring module is further electrically connected to the third copper bar group to detect the temperature of the third copper bar group and output a corresponding control signal to control the on-off of the direct current contactor K.

[0022] By adopting the technical scheme, the change of the current flow direction is automatically realized to protect the third copper bar group.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] 1. The accuracy of power regulation is improved, and the energy utilization efficiency is greatly improved.

[0025] 2. Single-gun output at least four gears is realized, and when double guns output at the same time, double-gun double-gear regulation or even three-gear regulation can also be realized. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a connection diagram of a four-section direct current output power distribution system for a direct current charging pile in embodiment 1 of the present application.

[0027] Figure 2 is a connection diagram of a four-section direct current output power distribution system for a direct current charging pile in embodiment 2 of the present application.

[0028] Figure 3 is a connection diagram of a four-section direct current output power distribution system for a direct current charging pile in Embodiment 3 of the present application.

[0029] Figure 4 is a module diagram of a four-section direct current output power distribution system for a direct current charging pile in Embodiment 4 of the present application.

[0030] Legend: 1, first output end; 11, first positive output end; 111, first negative output end; 12, second output end; 121, second positive output end; 122, second negative output end; 2, power supply group; 21, copper bar assembly; 211, first copper bar group; 2111, first positive copper bar; 2112, first negative copper bar; 212, second copper bar group; 2121, second positive copper bar; 2122, second negative copper bar; 213, third copper bar group; 2131, third positive copper bar; 2132, third negative copper bar; 214, fourth copper bar group; 2141, fourth positive copper bar; 2142, fourth negative copper bar; 22, input end; 3, fifth copper bar group; 311, fifth positive copper bar; 312, fifth negative copper bar; 31, sixth copper bar group; 32, seventh copper bar group; 4, first direct current contact group; 41, second direct current contact group; 42, third direct current contact group; 5, temperature monitoring module. DETAILED DESCRIPTION

[0031] The following will be described in detail in combination with the accompanying Figures 1-4 The present application will be further described in detail.

[0032] Embodiment 1 of the present application discloses a four-section direct current output power distribution system for a direct current charging pile. Referring to Figure 1 , the four-section direct current output power distribution system for a direct current charging pile comprises a first output end 1, a second output end 12, at least four power supply groups 2 and a plurality of direct current contactors K, the plurality of power supply groups 2 are connected in series between the first output end 1 and the second output end 12, the first output end 1 and the second output end 12 are respectively used for supplying power to two charging guns, the power supply group 2 is used for receiving the current input after rectification by a rectifier, and the direct current contactor K is connected in series between adjacent power supply groups 2 to control the on-off between the power supply groups 2.

[0033] Referring to Figure 1The power supply group 2 includes a plurality of copper bar assemblies 21 and a plurality of input terminals 22. Each copper bar assembly 21 adopts a combination of a positive copper bar and a negative copper bar. The copper bar assembly 21 includes a first copper bar assembly 211, a second copper bar assembly 212, a third copper bar assembly 213, and a fourth copper bar assembly 214. The first copper bar assembly 211 includes a first positive copper bar 2111 and a first negative copper bar 2112. The second copper bar assembly 212 includes a second positive copper bar 2121 and a second negative copper bar 2122. The first output terminal 1 includes a first positive output terminal 11 and a first negative output terminal 111. The first positive copper bar 2111 is connected in series between the second positive copper bar 2121 and the first positive output terminal 11. The first negative copper bar 2112 is connected in series between the second negative copper bar 2122 and the first negative output terminal 111. The third copper bar assembly 213 includes a third positive copper bar 2131 and a third negative copper bar 2132. The fourth copper bar assembly 214 includes a fourth positive copper bar 2141 and a fourth negative copper bar 2142. The third positive copper bar 2131 is connected in series between the second positive copper bar 2121 and the fourth positive copper bar 2141. The third negative copper bar 2132 is connected in series between the second negative copper bar 2122 and the fourth negative copper bar 2142. The second output terminal 12 includes a second positive output terminal 121 and a second negative output terminal 122. The fourth positive copper bar 2141 is connected in series between the third positive copper bar 2131 and the second positive output terminal 121. The fourth negative copper bar 2142 is connected in series between the third negative copper bar 2132 and the second negative output terminal 122.

[0034] The direct current contactor K includes direct current contactors K1, K2, K3, K4, K5, K6, K7, K8, K9 and K10. The direct current contactor K1 is connected in series between the second positive copper bar 2121 and the third positive copper bar 2131, and the direct current contactor K2 is connected in series between the second negative copper bar 2122 and the third negative copper bar 2132. The direct current contactor K3 is connected in series between the first positive copper bar 2111 and the second positive copper bar 2121, the direct current contactor K4 is connected in series between the first negative copper bar 2112 and the second negative copper bar 2122, the direct current contactor K5 is connected in series between the third negative copper bar 2132 and the fourth negative copper bar 2142, the direct current contactor K6 is connected in series between the third positive copper bar 2131 and the fourth positive copper bar 2141, the direct current contactor K7 is connected in series between the first positive output end 11 and the first positive copper bar 2111, the direct current contactor K8 is connected in series between the first negative output end 111 and the first negative copper bar 2112, the direct current contactor K9 is connected in series between the second negative output end 122 and the fourth negative copper bar 2142, and the direct current contactor K10 is connected in series between the second positive output end 121 and the fourth positive copper bar 2141. The input end 22 is electrically connected to each positive copper bar or negative copper bar, and is used to receive current input of the rectifier. The input end 22 is electrically connected to the corresponding copper bar assembly 21.

[0035] The implementation principle of the four-section direct current output power distribution system for the direct current charging pile is as follows: when a single charging gun charges the new energy vehicle, if one gear is selected, the direct current contactors K7 and K8 are turned on, and the remaining direct current contactors K are all turned off, so that only the first copper bar group 211 and the corresponding input end 22 supply power to the first output end 1. If two gears are selected, the direct current contactors K3 and K4 are turned on at this time, so that the second copper bar group 212 and the corresponding input end 22 of the first copper bar group 211 are connected in series and supply power to the first output end 1 at the same time. If three gears are selected, the direct current contactors K1 and K2 are turned on at this time, so that the third copper bar group 213, the second copper bar group 212 and the corresponding input end 22 of the first copper bar group 211 are connected in series and supply power to the first output end 1 at the same time. If four gears are selected, the direct current contactors K5 and K6 are turned on at this time, so that the fourth copper bar group 214, the third copper bar group 213, the second copper bar group 212 and the corresponding input end 22 of the first copper bar group 211 are connected in series and supply power to the first output end 1 at the same time.

[0036] If both charging guns are charging externally and both are in the second gear, only the DC contactor K1 and the DC contactor K2 are disconnected, and the others are all connected. At this time, the input end 22 corresponding to the first copper bar group 211 and the second copper bar group 212 supplies power to the first output end 1, and the input end 22 corresponding to the third copper bar group 213 and the fourth copper bar group 214 supplies power to the second output end 12.

[0037] Example 2:

[0038] The difference from Example 1 is that Figure 2 The four-stage DC output power distribution system for a DC charging pile also includes a fifth copper bar group 3 and a first DC contact group 4. The fifth copper bar group 3 includes a fifth positive copper bar 311 and a fifth negative copper bar 312. The fifth positive copper bar 311 is connected in series between the first positive copper bar 2111 and the fourth positive copper bar 2141, and the fifth negative copper bar 312 is connected in series between the first negative copper bar 2112 and the fourth negative copper bar 2142. The first DC contact group 4 includes a DC contactor K11 and a DC contactor K12. The DC contactor K11 is connected in series to the fifth positive copper bar 311, and the DC contactor K12 is connected in series to the fifth negative copper bar 312 to control the on / off of the fifth copper bar group 3.

[0039] Example 3:

[0040] The difference from Example 1 is that Figure 3 The four-stage DC output power distribution system for the DC charging pile also includes a sixth copper bar group 31 and a seventh copper bar group 32. The sixth copper bar group 31 includes a sixth positive copper bar 313 and a sixth negative copper bar 314. The seventh copper bar group 32 includes a seventh positive copper bar 321 and a seventh negative copper bar 322. One end of the sixth positive copper bar 313 is electrically connected to the third positive copper bar 2131, and the other end of the sixth positive copper bar 313 is electrically connected to the fifth positive copper bar 311 between the DC contactor K11 and the fourth positive copper bar 2141. One end of the sixth negative copper bar 314 is electrically connected to the third negative copper bar 2132. The other end of the sixth negative copper bar 314 is electrically connected to the fifth negative copper bar 312 between the DC contactor K12 and the fourth negative copper bar 2142; one end of the seventh positive copper bar 321 is electrically connected to the second positive copper bar 2121, and the other end of the seventh positive copper bar 321 is electrically connected to the fifth positive copper bar 311 between the DC contactor K11 and the first positive copper bar 2111; one end of the seventh negative copper bar 322 is electrically connected to the second negative copper bar 2122, and the other end of the seventh negative copper bar 322 is electrically connected to the fifth negative copper bar 312 between the DC contactor K12 and the first negative copper bar 2112.

[0041] Reference Figure 3The DC contactor K includes a second DC contact group 41 electrically connected to the sixth copper bar group 31 and a third DC contact group 42 electrically connected to the seventh copper bar group 32. The second DC contact group 41 includes a DC contactor K14 and a DC contactor K16, and the third DC contact group 42 includes a DC contactor K13 and a DC contactor K15. The DC contactor K13 is connected in series to the seventh positive copper bar 321, the DC contactor K14 is connected in series to the sixth positive copper bar 313, the DC contactor K15 is connected in series to the seventh negative copper bar 322, and the DC contactor K16 is connected in series to the sixth negative copper bar 314, so as to realize on-off control of the sixth copper bar group 31 and the seventh copper bar group 32.

[0042] Embodiment 4:

[0043] Different from embodiment 3, with reference to Figure 3 Different from embodiment 3, with reference to Figure 4 The four-section DC output power distribution system for the DC charging pile further includes a temperature monitoring module 5. The detection end of the temperature monitoring module 5 is electrically connected to the second positive copper bar 2121, the second negative copper bar 2122, the third positive copper bar 2131, and the third negative copper bar 2132, respectively. The temperature detection signal is obtained by detection, compared with the preset temperature threshold value, and the control signal is obtained and output to the DC contactor K13, the DC contactor K14, the DC contactor K15, the DC contactor K16, the DC contactor K11, and the DC contactor K12. For example, when the temperature of the second copper bar group 212 is too high and two gears are needed, the DC contactor K3 is closed, and the DC contactor K14 and the DC contactor K11 are turned on, so that the third copper bar group 213 and the first copper bar group 211 are connected in series to the first output end 1 for power supply. The temperature monitoring module 5 can use a temperature sensor, a processor, and a database in cooperation. The temperature is detected by the temperature sensor, the temperature threshold value is stored by the database, and the data is processed and calculated by the processor.

[0044] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, equivalent changes made on the basis of the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A four-section DC output power distribution system for a DC charging post, characterized by: The power supply group (2) comprises a plurality of copper bar assemblies (21) and a plurality of input terminals (22), a plurality of the copper bar assemblies (21) are connected in series between the first output terminal (1) and the second output terminal (12), the DC contactors K are connected in series between adjacent copper bar assemblies (21), and the input terminals (22) are used to receive the current input of the rectifier, and the input terminals (22) are electrically connected to the corresponding copper bar assemblies (21).

2. The four-section DC output power distribution system for a DC charging pile according to claim 1, characterized in that: The copper bar assembly (21) comprises a first copper bar group (211), a second copper bar group (212), a third copper bar group (213) and a fourth copper bar group (214), the first copper bar group (211) is connected in series between the first output terminal (1) and the second copper bar group (212), the third copper bar group (213) is connected in series between the second copper bar group (212) and the fourth copper bar group (214), and the fourth copper bar group (214) is connected in series on the second output terminal (12).

3. The four-section DC output power distribution system for a DC charging pile according to claim 2, characterized in that: The copper bar assembly (21) further comprises a fifth copper bar group (3), the fifth copper bar group (3) is electrically connected between the first copper bar group (211) and the fourth copper bar group (214), the DC contactor K comprises a first DC contact group (4) electrically connected to the fifth copper bar group (3), and the first DC contact group (4) is used to control the on-off of the fifth copper bar group (3).

4. The four-section DC output power distribution system for a DC charging pile according to claim 3, characterized in that: The copper bar assembly (21) further comprises a sixth copper bar group (31), the sixth copper bar group (31) is electrically connected between the third copper bar group (213) and the fifth copper bar group (3), the DC contactor K comprises a second DC contact group (41) electrically connected to the sixth copper bar group (31), and the second DC contact group (41) is used to control the on-off of the third copper bar group (213).

5. The four-section DC output power distribution system for a DC charging pile according to claim 4, characterized in that: The copper bar assembly (21) further comprises a seventh copper bar group (32), the seventh copper bar group (32) is electrically connected between the second copper bar group (212) and the fifth copper bar group (3), the DC contactor K comprises a third DC contact group (42) electrically connected to the seventh copper bar group (32), and the third DC contact group (42) is used to control the on-off of the seventh copper bar group (32).

6. The four-section DC output power distribution system for a DC charging pile according to claim 5, characterized in that: ​ 7. The four-section DC output power distribution system for a DC charging pile according to claim 6, characterized in that: The sixth copper bar group (31) is electrically connected to the fifth copper bar group (3) at a position close to the fourth copper bar group (214) of the first DC contact group (4), and the seventh copper bar group (32) is electrically connected to the fifth copper bar group (3) at a position close to the first copper bar group (211) of the first DC contact group (4).

8. The four-section DC output power distribution system for a DC charging post according to claim 7, characterized in that: A temperature monitoring module (5) is further included, which is electrically connected to the second copper bar group (212) to detect the temperature of the second copper bar group (212) and output a corresponding control signal to control the on-off of the DC contactor K.

9. The four-section DC output power distribution system for a DC charging post according to claim 8, characterized in that: The temperature monitoring module (5) is further electrically connected to the third copper bar group (213) to detect the temperature of the third copper bar group (213) and output a corresponding control signal to control the on-off of the DC contactor K.

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