A double ring pair cutting charge control system

Abstract

The application discloses a kind of liquid cooling super-charge charging control systems, belong to electric vehicle charger technical field, including: circuit breaker, AC contactor, multiple power modules, DC module;Three-phase alternating current is sequentially connected into power module after passing through circuit breaker and AC contactor;Power module converts three-phase alternating current into direct current, and direct current is input into DC module;DC module includes: the DC positive unit and DC negative unit of same structure, and both include: two annular structures of cutting structure;N direct current output lines in each annular structure of cutting structure correspondingly connect N charging guns, and N direct current output lines are connected into annular by DC contactor;Two direct current output lines in two annular structures of cutting structure are connected by DC contactor.This application can calculate the number of required power module according to the charging power required by charging gun, and control the on-off of each DC contactor to realize the adjustment of charging power.

Description

Technical Field

[0001] This invention belongs to the field of electric vehicle charger technology, specifically relating to a dual-ring switching charging control system. Background Technology

[0002] With the development of technology, new energy electric vehicles are being used more and more widely. As the power demand for electric vehicle charging continues to increase, high-power fast charging is becoming increasingly popular and is the future development trend of electric vehicle charging stations.

[0003] However, existing chargers have the following problems: 1. During charging, the charging gun is affected by temperature, resulting in a smaller charging current and a slower charging speed; 2. Traditional split-type chargers have low DC output current, resulting in low output power of the charging gun and low charging efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a dual-ring switching charging control system that can switch between high-power and low-power charging modes, making full use of resources and achieving efficient charging.

[0005] This invention provides the following technical solution: A dual-ring sliding charging control system includes: a circuit breaker, an AC contactor, multiple power modules, and a DC module; three-phase AC power passes sequentially through the circuit breaker and AC contactor before being connected to the power modules; the power modules convert the three-phase AC power into DC power and input the DC power into the DC module; the DC module includes: a DC positive unit, a DC negative unit, and a control unit; the DC positive unit and the DC negative unit have the same structure, each including: two ring sliding structures; N DC output lines in each ring sliding structure are connected to N charging guns, and the N DC output lines are connected in a ring through DC contactors; N intermediate DC contactors are provided between the two ring sliding structures to connect the two ring sliding structures into one unit; the control unit is used to calculate the number of power modules required according to the charging power required by the charging guns, and control the on / off state of each DC contactor to adjust the charging power.

[0006] Furthermore, each of the annular scissor structures includes: a first DC output line connected to the liquid-cooled charging gun, and a second DC output line connected to the ordinary charging gun; when the N DC output lines in the annular scissor structure form a ring, the first DC output line provides a first charging current to the liquid-cooled charging gun; the second DC output line provides a second charging current to power the ordinary charging gun; wherein, the first charging current is greater than the second charging current.

[0007] Furthermore, the control unit includes: a power control module, a switching board, and wiring terminals; the power control module, the switching board, and the DC contactor are connected through the wiring terminals; the power control module transmits signals with the circuit breaker and the AC contactor, and communicates with each charging gun.

[0008] Furthermore, the power module is powered as follows: one phase of the three-phase AC power from the input system is taken, passed through a miniature circuit breaker and a relay, and connected to a switching power supply. The switching power supply converts the AC power into 12V DC power to power the power control module.

[0009] Furthermore, it also includes a split-type cabinet; the split-type cabinet is formed by bending and welding galvanized steel sheet, and the surface is treated with electrostatic powder coating; the interior of the split-type cabinet includes: a first section for installing circuit breakers and AC contactors, a second section for installing multiple power modules, and a third section for installing the DC modules; the third section includes: two DC mounting plates arranged opposite each other, which are used to install the DC positive unit and the DC negative unit in the DC module, respectively.

[0010] Furthermore, it includes: two sets of circuit breakers and AC contactors for connecting two three-phase AC power supplies; the two sets of circuit breakers and AC contactors are installed opposite each other on the front and back of the first section.

[0011] Furthermore, the DC mounting plate has bent edges on its upper and lower sides, wire ties and wire holes on its front side, and upper and lower brackets for fixing, and rivet nuts and reinforcing ribs welded on its back side.

[0012] Furthermore, both the DC positive and DC negative units include: an input copper busbar, an output copper busbar, and a connecting copper busbar; one end of the input copper busbar in each DC output line is fixed to the bracket by an insulator; the other end is directly fixed to the DC contactor or connected to the DC contactor through a connecting copper busbar; the DC output copper lug of the power module is fixed to the input copper busbar of each DC output line; the two DC contactors are connected by a connecting copper busbar; each DC output line has an insulator on its input copper busbar for fixing the corresponding output copper busbar; the output copper busbar of each DC output line is connected to the corresponding input copper busbar, and the DC output copper lug of each DC output line is fixed to the corresponding output copper busbar.

[0013] Furthermore, the second partition is equipped with a cooling fan for cooling the power module; the cooling fan is powered by taking one phase of the three-phase AC power from the input system, passing it through a miniature circuit breaker and a relay, and then connecting it to the cooling fan.

[0014] Furthermore, the areas in the second partition where no power module is installed are equipped with blind plates to reduce the loss of cold air from the cooling fan.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The dual-ring switching charging control system provided by this invention changes the power supply mode of the DC output line of the charging gun through the switching function of the DC contactor, so as to realize the output of 250A DC power to the ordinary charging gun according to the actual scenario, or the dual-ring switching can form a 600A high current output to the liquid-cooled charging gun, realizing two charging modes of high power and low power, making full use of resources and charging efficiently. Attached Figure Description

[0016] Figure 1 This is a front view of the split-type cabinet in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the rear of the split-type cabinet in Embodiment 1 of the present invention; Figure 3 This is a wiring diagram of the DC positive electrode unit in Embodiment 1 of the present invention; Figure 4 This is a wiring diagram of the DC negative electrode unit in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the dual-ring switching charging control system in Embodiment 1 of the present invention; Figure 6 This is a first structural diagram of the DC positive electrode unit in Embodiment 2 of the present invention; Figure 7 This is a second structural diagram of the DC positive electrode unit in Embodiment 2 of the present invention; Figure 8 This is a schematic diagram of the back of the first mounting plate in Embodiment 2 of the present invention; Figure 9 This is a front view of the first mounting plate in Embodiment 2 of the present invention; Figure 10 This is a first structural diagram of the DC negative electrode unit in Embodiment 2 of the present invention; Figure 11 This is a second structural diagram of the DC negative electrode unit in Embodiment 2 of the present invention; The diagram is labeled as follows: 10 - Split-type cabinet; 11 - Front area of ​​the first partition; 12 - DC positive unit; 13 - Power module; 14 - Rear area of ​​the first partition; 15 - DC negative unit; 001 - Oval cable hole; 002 - Press-fit nut; 003 - Cable tie; 005 - Blind plate; 100 - Second mounting plate; 110 - First mounting plate; 101 - Reinforcing rib; 102 - Bracket; 201 - DC output copper lug of power module; 202 - 250A DC Output copper lug; 203-600A DC output copper lug; 204-First plastic vertical wire groove; 205-Terminal block; 206-Second plastic vertical wire groove; 207-Plastic horizontal wire groove; 208-Limit card; 210-Switching board; 211-Power control module; 212-First insulator; 213-Second insulator; 220-DC 12V switching power supply; 316-Bridging copper busbar; 317-Fourth connecting copper busbar; 320-Output copper busbar; 328-Bridge copper busbar. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention. Example 1

[0018] This embodiment provides a dual-ring switching charging control system, including: a circuit breaker, an AC contactor, multiple power modules 13, and a DC module.

[0019] like Figure 1 and Figure 2 As shown, the dual-ring switching charging control system in this embodiment is centrally arranged in the split cabinet 10. The system allows access to two three-phase AC power supplies. The split cabinet 10 includes three partitions. One side is the first partition, which is used to install circuit breakers and AC contactors. The upper part of the other side is the second partition, which is used to install power modules 13. The lower part of the other side is the third partition, which is used to install DC modules.

[0020] A set of circuit breakers and AC contactors is arranged in the front area 11 of the first partition for connecting the first three-phase AC power; similarly, another set of circuit breakers and AC contactors is arranged in the rear area 14 of the first partition for connecting the second three-phase AC power.

[0021] The three-phase AC power connected to the system passes through the circuit breaker and AC contactor in sequence before being connected to the power module 13 of the second zone. In the power module 13, 1AU1 to 1AU7 convert the first three-phase AC power into DC power, while 2AU1 to 2AU8 convert the second three-phase AC power into DC power. The power module 13 then inputs the converted DC power into the DC module of the third zone.

[0022] In some specific embodiments, the second partition is also equipped with a cooling fan for heat dissipation of the power module. The cooling fan is powered by taking one phase of the three-phase AC power from the input system, passing it through a miniature circuit breaker and a relay, and then connecting it to the cooling fan. In addition, the areas in the second partition where the power module is not installed are equipped with blind plates 005 to reduce the loss of cold air from the cooling fan.

[0023] The DC module consists of three parts: DC positive unit 12, DC negative unit 15, and control unit.

[0024] The third section has two mounting plates facing each other, used to mount the DC positive unit 12 and the DC negative unit 15 in the DC module, respectively. The DC positive unit 12 is mounted on the first mounting plate 110 in the front area 12 of the third section, and the DC negative unit 15 is mounted on the second mounting plate 100 in the back area 15 of the third section.

[0025] In some specific embodiments, the split cabinet 10 is formed by bending and welding galvanized steel sheet and the surface is treated with electrostatic powder coating.

[0026] As the inventive point of this invention, the DC positive electrode unit 12 and the DC negative electrode unit 15 have the same structure, both including: two annular tangent structures.

[0027] The following is for reference. Figures 3 to 5 Taking a charging gun with 12 units as an example, this paper introduces the composition, wiring method and working principle of DC positive unit 12 and DC negative unit 15.

[0028] Figure 3 This is a wiring diagram of the DC positive unit 12. As shown in the diagram, the DC positive unit 12 has two annular tangential structures, one above the other. Each annular tangential structure has six positive output lines. The six positive output lines in the upper annular tangential structure are as follows: the positive terminals of 2AU1 and 2AU2 are directly connected to the positive terminal of charging gun #7; the positive terminals of 2AU3 and 2AU4 are directly connected to the positive terminal of charging gun #8; the positive terminal of 2AU5 is directly connected to the positive terminal of charging gun #9; the positive terminal of 2AU6 is directly connected to the positive terminal of charging gun #10; the positive terminal of 2AU7 is directly connected to the positive terminal of charging gun #11; and the positive terminal of 2AU8 is directly connected to the positive terminal of charging gun #12. DC contactors 3ZK1, 3ZK3, 3ZK5, 3ZK7, 3ZK9, and 3ZK11 are installed between adjacent positive output lines in the upper annular tangential structure.

[0029] The lower half of the annular tangential structure has six positive output lines: 1AU1 and 1AU2 are directly connected to the positive terminal of charging gun #1; 1AU3 is directly connected to the positive terminal of charging gun #2; 1AU4 is directly connected to the positive terminal of charging gun #3; 1AU5 is directly connected to the positive terminal of charging gun #4; 1AU6 is directly connected to the positive terminal of charging gun #5; and 1AU7 is directly connected to the positive terminal of charging gun #6. DC contactors 1ZK1, 1ZK3, 1ZK5, 1ZK7, 1ZK9, and 1ZK11 are installed between adjacent positive output lines in the lower half of the annular tangential structure. When all of these DC contactors are closed, the positive output lines in the upper and lower halves are connected to form two rings respectively. Meanwhile, DC contactors are also installed between the positive output lines of the corresponding two charging guns in the two annular tangential structures. Specifically, DC contactor 2ZK1 is connected between the positive output lines of charging guns #1 and #7; DC contactor 2ZK3 is connected between the positive output lines of charging guns #2 and #8; DC contactor 2ZK5 is connected between the positive output lines of charging guns #3 and #9; DC contactor 2ZK7 is connected between the positive output lines of charging guns #4 and #10; DC contactor 2ZK9 is connected between the positive output lines of charging guns #5 and #11; and DC contactor 2ZK11 is connected between the positive output lines of charging guns #6 and #12.

[0030] Similarly, Figure 4 This is a wiring diagram of the DC negative electrode unit 15. As shown in the diagram, the two annular scissor structures in the DC negative electrode unit 15 are also divided into upper and lower parts. Each annular scissor structure has 6 negative electrode output lines. The 6 negative electrode output lines in the upper annular scissor structure are as follows: the negative electrodes of 2AU1 and 2AU2 are directly connected to the negative electrode of charging gun #7; the negative electrodes of 2AU3 and 2AU4 are directly connected to the negative electrode of charging gun #8; the negative electrode of 2AU5 is directly connected to the negative electrode of charging gun #9; the negative electrode of 2AU6 is directly connected to the negative electrode of charging gun #10; the negative electrode of 2AU7 is directly connected to the negative electrode of charging gun #11; and the negative electrode of 2AU8 is directly connected to the negative electrode of charging gun #12. DC contactors 3ZK1, 3ZK3, 3ZK5, 3ZK7, 3ZK9, and 3ZK11 are installed between adjacent negative electrode output lines in the upper annular scissor structure.

[0031] The six negative output lines in the lower ring-shaped tangential structure are as follows: the negative terminals of 1AU1 and 1AU2 are directly connected to the negative terminal of charging gun #1; the negative terminal of 1AU3 is directly connected to the negative terminal of charging gun #2; the negative terminal of 1AU4 is directly connected to the negative terminal of charging gun #3; the negative terminal of 1AU5 is directly connected to the negative terminal of charging gun #4; the negative terminal of 1AU6 is directly connected to the negative terminal of charging gun #5; and the negative terminal of 1AU7 is directly connected to the negative terminal of charging gun #6. DC contactors 1ZK1, 1ZK3, 1ZK5, 1ZK7, 1ZK9, and 1ZK11 are installed between adjacent negative output lines in the lower ring-shaped tangential structure. When all of the above DC contactors are turned on, the negative output lines in the upper and lower halves are connected to form two rings respectively. Meanwhile, DC contactors are also installed between the negative output lines of the corresponding two charging guns in the two annular tangential structures. Specifically, DC contactor 2ZK2 is connected between the negative output lines of charging guns #1 and #7; DC contactor 2ZK4 is connected between the negative output lines of charging guns #2 and #8; DC contactor 2ZK6 is connected between the negative output lines of charging guns #3 and #9; DC contactor 2ZK8 is connected between the negative output lines of charging guns #4 and #10; DC contactor 2ZK10 is connected between the negative output lines of charging guns #5 and #11; and DC contactor 2ZK12 is connected between the negative output lines of charging guns #6 and #12.

[0032] refer to Figure 1 and Figure 2 The DC positive unit 12 and the DC negative unit 15 are arranged back to back, and the control unit is located on one side of them, including: a power control module, a switching board and a terminal block; wherein, the power control module, the switching board and all DC contactors 1ZK1~3ZK12 are connected through the terminal block.

[0033] The power control module transmits signals to the circuit breaker and AC contactor, and communicates with each charging gun. Based on the charging power required by the charging gun, the power control module calculates the number of power modules needed and controls the on / off state of the corresponding DC contactor to adjust the charging power.

[0034] It should be noted that under normal conditions, DC contactors 1ZK1~1ZK12 and 3ZK1~3ZK12 are connected, while DC contactors 2ZK1~2ZK12 are disconnected. In this state, the upper and lower halves form two rings for power supply. That is to say, the charging guns #7~12 in the upper half can be powered by power modules 2AU1~2AU8; the charging guns #1~6 in the lower half can be powered by power modules 1AU1~1AU7.

[0035] When the upper or lower charging guns are underpowered, the power control module calculates the number of power modules required and then connects 2ZK1~2ZK12 via the control switching board. In this state, the upper and lower parts form a circuit, and any charging gun can call all power modules to supply power.

[0036] In addition, the present invention can set the rated output current of the DC output line by setting the specifications of the output copper busbar of the DC output line.

[0037] As an example, such as Figures 3 to 5 The display shows that charging guns #4 and #10 are high-power liquid-cooled charging guns with a rated current of 600A, while the other charging guns are ordinary charging guns with a rated current of 250A. Among them, the input copper busbars and output copper busbars of charging guns #4 and #10 are wider than those of the other charging guns.

[0038] In some embodiments, the power control module is powered as follows: one phase of the three-phase AC power from the input system is taken, and after passing through a miniature circuit breaker and a relay, it is connected to a DC 12V switching power supply 220. The DC 12V switching power supply 220 converts the AC power into 12V DC power to power the power control module. Example 2

[0039] Based on Example 1, this example provides a specific connection method for the DC module in the dual-ring switching charging control system. (Reference) Figure 6 and Figure 11 The 12 charging guns in the DC module each have corresponding positive and negative output lines. The positive output lines 1# to 12# constitute the DC positive unit 12, while the negative output lines 1# to 12# constitute the DC negative unit 15.

[0040] like Figures 6 to 7 The specific connection method of the DC positive unit 12 is shown in the figure. As can be seen from the figure, the DC positive unit 12 is installed as follows: Figure 8 and Figure 9 On the first mounting plate 110 shown. Figure 8 The back of the first mounting plate 110 is equipped with a press-fit nut 002 and two reinforcing ribs 101 are spot-welded on it. An oval wire hole 001 is opened on one side for mounting the control unit. Figure 9 This is the front of the first mounting plate 110, which has a cable tie 003 on its front, and also... Figure 6 The two brackets 102 are shown in the image.

[0041] Six first insulators 212 are arranged on each bracket 102, and a total of 12 first insulators 212 are arranged on the two brackets 102 to fix the input copper busbars of 12 positive output lines.

[0042] The 18 DC contactors 3ZK1, 3ZK3, 3ZK5, 3ZK7, 3ZK9, 3ZK11, 2ZK1, 2ZK3, 2ZK5, 2ZK7, 2ZK9, 2ZK11, 1ZK1, 1ZK3, 1ZK5, 1ZK7, 1ZK9 and 1ZK11 of the DC positive unit 12 pass through the bottom holes of the DC contactors with combination screws and are tightened with the rivet nuts 002 on the back of the first mounting plate 110. The 18 DC contactors are arranged in a matrix in the left side area of ​​the first mounting plate 110.

[0043] The upper half consists of positive output lines 1# to 6# from right to left, while the lower half consists of positive output lines 7# to 12# from right to left. The positive output lines 1# and 7#, 2# and 8#, 3# and 9#, 4# and 10#, 5# and 11#, and 6# and 12# are arranged opposite each other.

[0044] One end of the input copper busbar in the positive output lines #2, #4, #6, #8, #10, and #12 is directly and fixedly connected to the nearest contact point on the corresponding DC contactor, while the other end is fixed to the corresponding first insulator 212. The input copper busbars of the two opposite positive output lines are respectively connected to the two contacts of the DC contactor in the middle of the two positive output lines through bridging copper busbars 316.

[0045] As an example: one end of the input copper busbar in the #2 positive output line is directly fixed to the lower contact of DC contactor 1ZK3, and the other end is fixed to the first insulator 212 outside 1ZK3. Conversely, one end of the input copper busbar in the #8 positive output line is directly fixed to the upper contact of DC contactor 3ZK3, and the other end is also fixed to the first insulator 212 outside 3ZK3. The input copper busbar in the #2 positive output line is connected to the lower contact of 2ZK3 via bridging copper busbar 316, while the input copper busbar in the #8 positive output line is connected to the upper contact of 2ZK3 via bridging copper busbar 316.

[0046] Unlike other positive output lines 1#, 3#, 5#, 7#, 9#, and 11#, one end of the input copper busbar is not directly connected to the contact on the corresponding DC contactor, nor is it connected to the corresponding intermediate DC contactor through the bridging copper busbar 316. Instead, the intermediate DC contactor is first connected to the DC contactors on both sides using two direct-connection copper busbars. Then, one end of the input copper busbar in the positive output lines 1#, 3#, 5#, 7#, 9#, and 11# is fixedly connected to the corresponding direct-connection copper busbar through the first connecting copper busbar, while the other end is still fixed to the corresponding first insulator 212.

[0047] As an example: the upper contact of DC contactor 1ZK1 corresponding to the #1 positive output line and the lower contact of intermediate DC contactor 2ZK1 are connected by a direct-connect copper busbar; the lower contact of DC contactor 3ZK1 corresponding to the #7 positive output line and the upper contact of intermediate DC contactor 2ZK1 are also connected by a direct-connect copper busbar; one end of the input copper busbar of the #1 positive output line is connected to the direct-connect copper busbar between 1ZK1 and 2ZK1 through the first connecting copper busbar, and similarly, one end of the input copper busbar of the #7 positive output line is connected to the direct-connect copper busbar between 3ZK1 and 2ZK1 through the first connecting copper busbar; the other ends of the two input copper busbars are fixed on the corresponding first insulator 212.

[0048] The above describes the connection methods between a single positive output line and two positive output lines arranged opposite each other. Next, we will introduce the implementation method of a ring connection.

[0049] The lower ring connection includes: the fixing point of the #1 positive output line input copper busbar and the first connecting copper busbar is also fixed to the upper connection point of 1ZK3 in the #2 positive output line through the second connecting copper busbar; the #2 positive output line input copper busbar is fixed to the lower connection point of 1ZK5 in the #3 positive output line through the third connecting copper busbar; and so on, the fixing point of the #3 positive output line input copper busbar and the first connecting copper busbar is also fixed to the upper connection point of 1ZK7 in the #4 positive output line through the second connecting copper busbar; the #4 positive output line input copper busbar is fixed to the lower connection point of 1ZK9 in the #5 positive output line through the third connecting copper busbar; finally, the fixing point of the #5 positive output line input copper busbar and the first connecting copper busbar is also fixed to the upper connection point of 1ZK11 in the #6 positive output line through the second connecting copper busbar; the #6 positive output line input copper busbar is fixed to the lower connection point of 1ZK9 in the #1 positive output line through the fourth connecting copper busbar 317 and the bridge copper busbar 328.

[0050] Similarly, the upper ring connection includes: the fixing point of the 7# positive output line input copper busbar and the first connecting copper busbar is also fixed to the lower connection point of 3ZK3 in the 8# positive output line via the second connecting copper busbar; the 8# positive output line input copper busbar is fixed to the upper connection point of 3ZK5 in the 9# positive output line via the third connecting copper busbar; and so on, the fixing point of the 9# positive output line input copper busbar and the first connecting copper busbar is also fixed to the 3ZK3 in the 10# positive output line via the second connecting copper busbar. The lower connection of K7, the input copper busbar of the 10# positive output line is fixed to the upper connection of 3ZK9 in the 11# positive output line through the third connecting copper busbar; finally, the fixing point of the input copper busbar of the 11# positive output line and the first connecting copper busbar is also fixed to the lower connection of 3ZK11 in the 12# positive output line through the second connecting copper busbar, and the input copper busbar of the 12# positive output line is fixed to the upper connection of 3ZK9 in the 7# positive output line through the fourth connecting copper busbar 317 and the bridge copper busbar 328.

[0051] Each positive output line also has a DC output copper lug 201 fixed on its input copper busbar.

[0052] refer to Figures 6 to 7 The input copper busbars of the positive output lines 1#~7#, 9# and 11# are also fixed with second insulators 213. One end of the output copper busbars 320 of these positive output lines is fixed to the corresponding input copper busbar, and the other end is fixed to the second insulator 213. The bridging copper busbars 316 in the positive output lines 8#, 10# and 12# are output copper busbars.

[0053] By installing DC output copper lugs on the bridging copper busbar 316 in the 8# and 12# positive output lines and on all output copper busbars 320, the connection with the corresponding charging gun terminal is achieved. Among them, the 600A DC output copper lug 203 is used in the 4# and 10# positive output lines, which are high-power liquid-cooled charging guns, while the 250A DC output copper lug 202 is used in the other lines.

[0054] Next, let's introduce the connection of the control unit. The power control module 211 and the switching board 210 are fixed to the first mounting plate 110 by combination screws. The first plastic vertical groove 204, the second plastic vertical groove 206 and the plastic horizontal groove 207 are fixed to the first mounting plate 110 by self-tapping screws. The two circuit breaker rails are fixed to the first mounting plate 110 by self-tapping screws. Then, 24 terminals 205 are snapped on the circuit breaker rails and their ends are fixed with limit clips. Similarly, 12 terminals are snapped on the circuit breaker rails and fixed with limit clips.

[0055] In this embodiment, Figures 10 to 11 The connection method of the DC negative electrode unit 15 shown is exactly the same as that of the DC positive electrode unit 12. The two are mirror images of each other, so it will not be described again here.

[0056] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0057] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0058] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A dual-ring switching charging control system, characterized in that, include: Circuit breakers, AC contactors, multiple power modules, DC modules; Three-phase AC power passes through a circuit breaker and an AC contactor in sequence before being connected to the power module; The power module converts three-phase AC power into DC power and inputs the DC power into the DC module; The DC module includes: a DC positive unit, a DC negative unit, and a control unit; The DC positive electrode unit and the DC negative electrode unit have the same structure, both including: two annular tangent structures; The N DC output lines in each ring-shaped tangential structure are connected to N charging guns, and the N DC output lines are connected in a ring through a DC contactor. N intermediate DC contactors are provided between the two annular tangential structures to connect the two annular tangential structures into one unit. Each of the annular scissor structures includes: a first DC output line connecting to the liquid-cooled charging gun, and a second DC output line connecting to the ordinary charging gun; when the N DC output lines in the annular scissor structure form a ring, the first DC output line provides a first charging current to the liquid-cooled charging gun; the second DC output line provides a second charging current to power the ordinary charging gun; wherein, the first charging current is greater than the second charging current. It also includes a split-type cabinet; the split-type cabinet is formed by bending and welding galvanized steel sheet, and the surface is treated with electrostatic powder coating; the interior of the split-type cabinet includes: a first section for installing circuit breakers and AC contactors, a second section for installing multiple power modules, and a third section for installing the DC modules; the third section includes: two DC mounting plates arranged opposite each other, which are used to install the DC positive unit and the DC negative unit in the DC module, respectively; The DC mounting plate has bent edges on the upper and lower sides, wire ties and wire holes on its front side, and upper and lower brackets are fixed thereon. The back side has rivet nuts and reinforcing ribs welded on it. Both the DC positive and DC negative units include: an input copper busbar, an output copper busbar, and a connecting copper busbar; one end of the input copper busbar in each DC output line is fixed to the bracket by an insulator; the other end is directly fixed to the DC contactor or connected to the DC contactor through a connecting copper busbar; the DC output copper lug of the power module is fixed to the input copper busbar of each DC output line; the two DC contactors are connected by a connecting copper busbar; each DC output line has an insulator on its input copper busbar for fixing the corresponding output copper busbar; the output copper busbar of each DC output line is connected to the corresponding input copper busbar, and the DC output copper lug of each DC output line is fixed to the corresponding output copper busbar; The control unit is used to calculate the number of power modules required based on the charging power demanded by the charging gun, and to control the on / off state of each DC contactor to adjust the charging power.

2. The dual-ring switching charging control system according to claim 1, characterized in that, The control unit includes: a power control module, a switching board, and wiring terminals; The power control module, switching board, and DC contactor are connected via terminal blocks. The power control module transmits signals to the circuit breaker and AC contactor, and communicates with each charging gun.

3. The dual-ring switching charging control system according to claim 1, characterized in that, The power supply module is powered as follows: one phase of the three-phase AC power from the input system is taken, and after passing through a miniature circuit breaker and a relay, it is connected to a switching power supply. The switching power supply converts the AC power into 12V DC power to power the power control module.

4. The dual-ring switching charging control system according to claim 1, characterized in that, Includes: two sets of circuit breakers and AC contactors for connecting two three-phase AC power supplies; The two sets of circuit breakers and AC contactors are installed opposite each other on the front and back of the first section.

5. The dual-ring switching charging control system according to claim 1, characterized in that, The second partition is equipped with a cooling fan for cooling the power module; The cooling fan is powered by taking one phase of the three-phase AC power from the input system, passing it through a miniature circuit breaker and a relay, and then connecting it to the cooling fan.

6. The dual-ring switching charging control system according to claim 5, characterized in that, The area in the second partition where no power module is installed is equipped with a blind plate to reduce the loss of cold air from the cooling fan.

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