Branch box special for alternating current charging pile and power supply control method thereof

Abstract

This invention relates to a dedicated branch box for AC charging piles and its power supply control method. The box includes a housing, a main power supply circuit within the box, a branch distribution circuit electrically connected to the main power supply circuit, and multiple outgoing line units. The main power supply circuit includes a horizontal main busbar arranged horizontally within the box, an incoming line interface at one end of the horizontal main busbar, an expansion interface at the opposite end, and a main disconnect switch between the incoming line interface and the horizontal main busbar. The incoming line interface and the expansion interface are fixedly connected to the horizontal main busbar, and the expansion interface is used to connect to the main power supply circuit of another branch box of the same type via a cable. The branch distribution circuit is located on one side of the horizontal main busbar and electrically connected to it. Multiple outgoing line units are spaced apart along the length of the branch distribution circuit. Each outgoing line unit includes a circuit breaker installed on the branch distribution circuit and an outgoing line interface electrically connected to the circuit breaker. The outgoing line interface is located at the bottom of the box. This invention improves power distribution safety.

Description

Technical Field

[0001] This invention belongs to the technical field of power distribution, and in particular relates to a dedicated branch box for AC charging piles and its power supply control method. Background Technology

[0002] Currently, with the increasing number of electric vehicles, multiple AC charging piles are often needed to be centrally installed in the same station or parking area, powered by a unified upstream power distribution system. To facilitate construction and maintenance, intermediate branch boxes are often installed between the upstream power distribution device and each AC charging pile to complete functions such as incoming line aggregation, outgoing line distribution, and centralized access of neutral and ground wires. At the same time, it is also necessary to take into account constraints such as limited installation space, dense on-site wiring, and future expansion needs.

[0003] Existing branch boxes mostly adopt a general low-voltage distribution box structure, with the main incoming busbar and various outgoing switches installed separately inside the box. The incoming terminals are connected to each outgoing terminal one by one by multiple wires or busbars, and the cables are led out through holes in the bottom or side of the box. In this structure, the main busbar, neutral busbar, and grounding busbar are arranged relatively independently, and the outgoing units are installed as close as possible to the inside of the box according to the space conditions. This results in the conductors inside the box running in a crisscross pattern and the cables having many bends. When it is necessary to add outgoing circuits or cascade with other branch boxes, it is often necessary to readjust the original wiring, making the installation and maintenance operations cumbersome and the work area close to live parts. The wiring inside the box is also difficult to keep orderly during long-term operation. Summary of the Invention

[0004] The purpose of this invention is to provide a dedicated branch box for AC charging piles and its power supply control method, so as to solve the technical problem that the existing AC charging pile branch boxes are not conducive to the centralized access and expansion of multiple charging piles in terms of busbar and outgoing line organization, resulting in messy internal wiring and inconvenient operation and maintenance.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a dedicated branch box for AC charging piles, comprising a box body, a main power supply circuit disposed within the box body, a branch distribution circuit electrically connected to the main power supply circuit, and multiple outgoing line units; The main power supply circuit includes a horizontal main busbar arranged horizontally inside the enclosure, an incoming line interface at one end of the horizontal main busbar, an expansion interface at the opposite end of the horizontal main busbar, and a main disconnect switch between the incoming line interface and the horizontal main busbar. The incoming line interface and the expansion interface are fixedly connected to the horizontal main busbar, and the expansion interface is used to connect to the main power supply circuit of another branch box of the same type via a cable. The branch distribution circuit is located on one side of the horizontal main busbar and is electrically connected to the horizontal main busbar; The plurality of outgoing line units are spaced apart along the length of the branch distribution circuit. Each outgoing line unit includes a circuit breaker installed on the branch distribution circuit and an outgoing line interface electrically connected to the circuit breaker. The outgoing line interface is located at the bottom of the enclosure.

[0006] By adopting the above technical solution, through the enclosure, the main power supply circuit located inside the enclosure, the branch distribution circuit electrically connected to the main power supply circuit, and multiple outgoing line units, the incoming line collection, busbar transmission, branch power distribution, and multi-way outgoing line organization can be completed within the same enclosure. This allows electrical energy to flow sequentially from the upstream power supply through the main power supply circuit and the branch distribution circuit in a clear path before entering each outgoing line unit. This avoids the direct series connection of a large number of scattered cables between the upstream distribution cabinet and each AC charging pile, reduces on-site wiring points and crossover locations, and facilitates centralized construction wiring and fixed maintenance locations. The system employs a horizontally arranged main busbar within the enclosure for the main power supply circuit. An incoming line interface is located at one end of the busbar, and an expansion interface is located at the opposite end, both fixedly connected to the main busbar. This allows the upstream power supply to be introduced from one end and extended along the busbar towards the other. An interface is reserved at the other end for cascading with the main power supply circuit of a similar branch box via cable. This allows multiple branch boxes to be connected in series via the expansion interface while maintaining the single-box structure, facilitating on-demand expansion of power distribution capacity when the site is expanded or the number of charging piles increases. The incoming line interface connects to the horizontal main busbar... A main disconnect switch is installed between the busbars, which concentrates the main circuit inlet of the entire branch box into a single switch position. With this switch open, the path from the upstream power supply to all downstream busbars and outgoing units within the box is cut off. Therefore, during maintenance, circuit breaker replacement, or wiring adjustments, operating the main disconnect switch can isolate all circuits within the box, reducing the risk of accidental energization and simplifying power outage procedures. By placing the branch distribution circuit on one side of the horizontal main busbar and electrically connecting it, and by spacing multiple outgoing units along the length of the branch distribution circuit, each outgoing... The line unit includes a circuit breaker installed on the branch distribution circuit and an outgoing interface located at the bottom of the enclosure and electrically connected to the circuit breaker. This allows the branch busbar, circuit breaker, and corresponding outgoing interface to form a top-to-bottom, length-direction corresponding structure in space. The current enters the branch distribution circuit from the horizontal main busbar and is then distributed to each circuit breaker and sent to each charging pile through the bottom outgoing interface. This ensures that the electrical path and physical path of each circuit correspond one-to-one within the enclosure. The outgoing cables can be led out in rows along the bottom of the enclosure, facilitating wiring according to circuit number and subsequent quick location of the corresponding charging pile.

[0007] In one example, the present invention can be further configured such that: the horizontal main busbar is fixed to the inner wall of the enclosure by a plurality of insulators, the insulators being arranged at intervals along the length of the horizontal main busbar, so that a predetermined gap is formed between the horizontal main busbar and the enclosure.

[0008] By adopting the above technical solution, the horizontal main busbar is fixed to the inner wall of the enclosure by multiple insulators, and the insulators are arranged at intervals along the length of the horizontal main busbar. This forms multiple evenly distributed support points along the entire length of the horizontal main busbar, which can disperse the weight of the busbar and the concentrated effects of electromagnetic force and thermal stress on the single-point support. This makes the horizontal main busbar less prone to sagging, twisting or shifting during long-term operation. At the same time, by forming a predetermined gap between the horizontal main busbar and the enclosure, a stable electrical insulation distance can be maintained between the busbar and the metal wall of the enclosure. Sufficient space is reserved for air gaps and creepage distances, so that a reasonable insulation gap can still be maintained under the condition of busbar temperature changes or enclosure vibration by external forces. This reduces the risk of busbar discharge or breakdown to the enclosure and provides a continuous operating channel for wiring and transfer near the busbar.

[0009] In one example, the present invention can be further configured such that the main disconnect switch is mounted on a mounting plate inside the enclosure; The branch distribution circuit includes a distribution busbar disposed within an insulating housing, the insulating housing being fixed within the enclosure and arranged parallel to the horizontal main busbar.

[0010] By adopting the above technical solution, the main disconnect switch is installed on the mounting plate inside the enclosure, which ensures that the main disconnect switch and other components inside the enclosure maintain a fixed relative position. The mounting plate serves as a dedicated mounting reference to withstand operating forces and wiring tension, making it less prone to loosening and displacement during frequent operation and wiring maintenance, thus ensuring the mechanical reliability and contact stability of the main circuit. The branch distribution circuit, including the distribution busbar housed within the insulating housing and fixed within the enclosure parallel to the horizontal main busbar, forms an independent, enclosed busbar channel near the main busbar. This isolates the distribution busbar from the surrounding metal structure and other conductors, reducing the exposed length and contact opportunities of the distribution busbar. Furthermore, the distribution busbar extends parallel to the horizontal main busbar, forming a clear two-layer busbar channel of main and distribution busbars. This facilitates the orderly placement of the main and branch circuits within the limited enclosure depth, reducing coupling interference and accidental contact between internal conductors.

[0011] In one example, the invention can be further configured such that: each circuit breaker is fixed to the insulating housing of the branch distribution circuit by a mounting structure at its bottom, the input terminal of the circuit breaker is electrically connected to the distribution busbar, and each circuit breaker is arranged at intervals along the length of the branch distribution circuit.

[0012] By adopting the above technical solution, each circuit breaker is fixed to the insulating housing of the branch distribution circuit through its bottom mounting structure. This allows the mechanical load and operational impact of the circuit breaker to be directly transmitted to the insulating housing and enclosure structure, avoiding the stress on the wiring conductors and thus reducing loosening and poor contact caused by stress on the conductor contacts. By electrically connecting the circuit breaker's input terminal to the distribution busbar and arranging each circuit breaker at intervals along the length of the branch distribution circuit, each branch circuit can draw power directly from the same distribution busbar via the shortest path. The branch circuits do not intersect each other, forming a neatly arranged row of operating units. Operators can observe and operate by sequentially checking the status of each circuit breaker along the length of the branch distribution circuit, thereby reducing the possibility of wiring crossings and circuit confusion, and facilitating the disconnection, connection, and troubleshooting of individual circuits.

[0013] In one example, the present invention can be further configured as follows: a main neutral busbar and a transition neutral busbar are provided inside the enclosure; the main neutral busbar is fixed to a mounting plate inside the enclosure; the transition neutral busbar is fixed to the insulating housing of the branch distribution circuit; the transition neutral busbar is electrically connected to the main neutral busbar through a conductor; and the neutral conductor of each of the outgoing units is sequentially connected to the transition neutral busbar.

[0014] By adopting the above technical solution, and by setting a main neutral busbar and a transition neutral busbar inside the enclosure, with the main neutral busbar fixed on the mounting plate inside the enclosure and the transition neutral busbar fixed on the insulating shell of the branch distribution circuit, the neutral wire collection point facing the upstream power supply and the neutral wire access point facing each outgoing unit can be arranged in a spatially layered manner. The main neutral busbar is closer to the incoming side, and the transition neutral busbar is closer to the area where each outgoing unit is located. By electrically connecting the transition neutral busbar to the main neutral busbar through a conductor, and by connecting the neutral wire conductor of each outgoing unit to the transition neutral busbar in sequence, the neutral wires of each outgoing line can be connected at a position close to the circuit breaker and the branch distribution circuit, and then uniformly led to the main neutral busbar by the transition neutral busbar. This shortens the wiring length of each neutral branch and avoids all neutral wires being directly concentrated to the main neutral busbar, which would lead to excessively dense local wiring. Thus, without changing the overall neutral topology, the neutral wire wiring layout is closer to the actual location distribution of each branch circuit, which is convenient for expanding new circuits and maintaining existing circuits.

[0015] In one example, the present invention can be further configured as follows: a protective grounding bar is provided inside the enclosure, the protective grounding bar is installed on a PE bar mounting bracket, the PE bar mounting bracket is fixed on the inner wall of the enclosure, a plurality of grounding terminals are provided on the protective grounding bar, and the grounding conductors of the enclosure and each of the outgoing line units are connected to the protective grounding bar.

[0016] By adopting the above technical solution, and by setting up a protective grounding busbar inside the enclosure and installing it on a mounting bracket fixed to the inner wall of the enclosure, an independent mechanical support and a clear installation reference can be provided for the grounding conductor. This keeps the protective grounding busbar away from the high-potential areas of the main busbar and branch busbars, forming a separate grounding busbar. By setting multiple grounding terminals on the protective grounding busbar and connecting the grounding conductors of the enclosure and each outgoing unit to the protective grounding busbar, the grounding wires of the enclosure shell, internal conductive components, and external equipment can all be gathered at the same grounding point. This grounding point is then connected to the upper-level grounding system, making the grounding potential of each circuit more consistent. This reduces the potential difference caused by uneven grounding in different parts, so that in the event of a fault current or leakage current, it can flow back to the grounding system along the shortest path, which is beneficial for the rapid action of the protection device.

[0017] In one example, the present invention can be further configured such that: an insulating partition is provided in front of the operating side of the horizontal main busbar and the branch distribution circuit inside the enclosure, the insulating partition extending along the length direction of the horizontal main busbar and the branch distribution circuit, and being detachably connected to the enclosure by a fastener.

[0018] By adopting the above technical solution, an insulating partition is installed in front of the operating side of the horizontal main busbar and branch distribution circuit inside the enclosure, and the insulating partition extends along the length of the two. This creates a continuous insulating isolation surface between the operating space and the main live busbar. When the enclosure door is opened, the operator first comes into contact with the insulating partition side, rather than the busbar and circuit breaker terminals. The insulating partition is detachably connected to the enclosure by fasteners. After completing safety measures such as power outage and voltage testing, the insulating partition can be removed by disassembling the fasteners to expose the main busbar, branch busbar, and circuit breaker wiring positions for necessary maintenance and adjustment. This introduces the operating sequence of "normal isolation, removal when necessary" in the structural design, improving the isolation between the operator and live components in the event of daily door opening inspections or accidental opening of the enclosure, without affecting the normal operation of the equipment and the convenience of maintenance.

[0019] In one example, the present invention can be further configured as follows: a plurality of waterproof cable connectors are provided at the bottom of the enclosure corresponding to the positions of each of the outgoing interfaces, each of the outgoing interfaces corresponds one-to-one with the corresponding waterproof cable connector, the waterproof cable connectors are installed on the bottom plate of the enclosure and extend outward from the enclosure, and the cables led out from each of the circuit breakers extend out of the enclosure in sequence through the corresponding outgoing interfaces and waterproof cable connectors; The bottom of the enclosure is provided with cable fixing clips on the inner side of each of the waterproof cable joints. The cable fixing clips are arranged in a row at the bottom of the enclosure and fixed to the bottom plate of the enclosure by fasteners, and are used to clamp the cables introduced from each of the waterproof cable joints.

[0020] By adopting the above technical solution, multiple waterproof cable connectors are installed at the bottom of the enclosure corresponding to each outgoing interface, and each outgoing interface corresponds one-to-one with its corresponding waterproof cable connector. This creates a separate cable entry point and compression sealing structure at the point where each outgoing cable exits the bottom plate of the enclosure. After the cable enters the outgoing interface from the circuit breaker's outgoing end, it extends out of the enclosure through the corresponding waterproof cable connector, ensuring that the cable's penetration position is structurally consistent with its corresponding outgoing circuit. The waterproof cable connectors, installed on the bottom plate of the enclosure and extending outwards, create a sealed transition zone of a certain length between the inside and outside of the enclosure. This ensures that the cable sheath is fully wrapped and compressed where it passes through the bottom plate, reducing the possibility of moisture, dust, and foreign objects intruding into the enclosure along the cable's exterior. It also provides some tensile strength for the external cables. By adopting the above technical solution, cable fixing clips are installed on the inside of each waterproof cable connector at the bottom of the enclosure. These clips are arranged in rows at the bottom of the enclosure and fixed to the bottom plate with fasteners. This provides a secondary mechanical clamping position for each cable entering the enclosure after the waterproof cable connector. This ensures that the cable is immediately fixed in the bottom area after entering the enclosure, preventing it from extending suspending to the upper terminal block. The cable fixing clips are used to hold the cables introduced from each waterproof cable connector, blocking external tension, torque, or shaking applied to the cable at the bottom clamping position. This reduces the stress on the sealing parts of the waterproof cable connector and the upper cable outlet, thereby reducing the risk of seal failure, conductor loosening, or terminal damage caused by long-term mechanical stress. It also keeps the cable routing at the bottom of the enclosure neat, facilitating inspection and organization.

[0021] In one example, the present invention can be further configured as follows: the upper part of the box is provided with a plurality of hanging ears, the hanging ears are provided with mounting holes for installing fasteners, the bottom of the box is provided with a base, the base is provided with fixing holes for connecting with the mounting base surface.

[0022] By adopting the above technical solution, multiple hanging ears are provided on the upper part of the enclosure, and mounting holes for fasteners are made on the hanging ears. During installation, the enclosure can be fixed to the wall, column, or bracket through the hanging ears, realizing a suspended or semi-suspended installation method. The center of gravity of the enclosure is supported by the upper connecting parts, which is more suitable for occasions with limited vertical space or where it needs to be arranged in a row with other equipment. By providing a base at the bottom of the enclosure and fixing holes on the base for connection with the mounting surface, a rigid connection can be made to the ground or foundation platform when needed, providing additional lower support and anti-overturning capacity for the enclosure. When the hanging ears and the base are used together, the enclosure has fixing points in both the upper and lower directions, thus adapting to different installation environments and stress conditions, and giving the branch box good overall stability and vibration resistance during operation.

[0023] In a second aspect, the present invention provides a power supply control method for a dedicated branch box for AC charging piles, the method comprising: Obtain the access status information of the incoming interface; The main disconnect switch is closed according to the access status information, and electrical energy is transmitted to the horizontal main busbar; Based on the electrical connection between the horizontal main busbar and the branch distribution circuit, the electrical energy is distributed to obtain multiple branch power supply paths; The output power is controlled by the circuit breaker conduction status corresponding to each branch power supply path, and the power is supplied to another branch box of the same type according to the connection status of the expansion interface.

[0024] By adopting the above technical solution, and by obtaining the access status information of the incoming interface, it is possible to confirm whether the upstream power supply is connected and whether the incoming side has the power supply conditions, thereby providing a basis for the subsequent control of the main disconnect switch and the establishment of the power supply path for the entire enclosure; by controlling the closing of the main disconnect switch according to the access status information and transmitting power to the horizontal main busbar, the main circuit path can be uniformly established by the main disconnect switch after confirming that the incoming conditions are met, so that the incoming power is stably transmitted to the main power supply area inside the enclosure along the fixed main channel; by determining the electrical connection relationship between the horizontal main busbar and the branch distribution circuit, the main disconnect switch can be used to establish the main circuit path. The electrical energy is distributed to obtain multiple branch power supply paths, which can distribute the electrical energy in the main circuit to multiple branch circuits according to the predetermined power distribution structure, so that each outgoing unit forms an independent power supply path corresponding to each other on the basis of a unified incoming line; by controlling the output of electrical energy through the outgoing interface according to the conduction status of the circuit breaker corresponding to each branch power supply path, and supplying power to another branch box of the same type according to the connection status of the expansion interface, it is possible to realize the power supply of multiple AC charging piles by circuit and the continued transfer of power to the next level branch box on the basis of independent control of each circuit, thus taking into account the operational needs of centralized power distribution and cascading expansion of multiple charging piles. Attached Figure Description

[0025] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is an internal front view of the AC charging pile dedicated branch box according to an embodiment of the present invention; Figure 2 This is an internal side view of the AC charging pile dedicated branch box according to an embodiment of the present invention; Figure 3 This is a bottom view of the AC charging pile dedicated branch box according to an embodiment of the present invention; Figure 4 This is a power distribution system diagram of a dedicated branch box for AC charging piles according to an embodiment of the present invention; Figure 5This is a flowchart of a power supply control method for a dedicated branch box for AC charging piles according to an embodiment of the present invention.

[0026] The components are: 1-box body, 11-insulator, 12-waterproof cable connector, 13-cable fixing clip, 14-hanging ear, 15-base, 2-horizontal main busbar, 21-inlet interface, 22-extension interface, 3-main neutral busbar, 4-transfer neutral busbar, 5-main disconnect switch, 6-protective grounding busbar, 61-PE busbar mounting bracket, 7-circuit breaker, 8-insulating partition, 10-main power supply circuit, 20-branch distribution circuit. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0028] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0029] Example 1 In one embodiment, such as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the present invention provides a dedicated branch box for AC charging piles, including a box body 1, a main power supply circuit 10 disposed in the upper region of the box body 1, a branch distribution circuit 20 electrically connected to the main power supply circuit 10 and disposed in the middle region of the box body 1, and a plurality of outgoing line units arranged sequentially along the length of the branch distribution circuit 20. The main power supply circuit 10 includes a horizontal main busbar 2 arranged horizontally within the box body 1, an inlet interface 21 disposed at one end of the horizontal main busbar 2, an expansion interface 22 disposed at the opposite end of the horizontal main busbar 2, and a main disconnect switch 5 disposed between the inlet interface 21 and the horizontal main busbar 2. The inlet interface 21 and the expansion interface 22 are respectively fixed to both ends of the horizontal main busbar 2 by conductive connectors. During operation, the phase conductor of the upstream power supply is connected to the incoming interface 21. When the main disconnect switch 5 is operated from the open position to the closed position, the current flows sequentially through the incoming interface 21 and the main disconnect switch 5 into the horizontal main busbar 2, and then through a conductor on one side of the horizontal main busbar 2 into the branch distribution circuit 20. At the same time, it can continue to transfer power to the next level of the same type of branch box through the expansion interface 22. In multiple outgoing units, the incoming terminal of the circuit breaker 7 of each outgoing unit is connected to the distribution busbar inside the branch distribution circuit 20, and the outgoing terminal of the circuit breaker 7 is connected to the outgoing interface at the bottom of the box 1 through a wire. The cable is led out from the outgoing interface and connected to the corresponding AC charging pile to realize an independent power supply circuit. By opening and closing the main disconnect switch 5 and each circuit breaker 7, the sequential connection and disconnection of the entire box's incoming line and each outgoing line can be completed, thereby realizing centralized power distribution and cascading expansion of multiple charging piles under the premise of unified incoming line.

[0030] Furthermore, such as Figure 1 and Figure 2 As shown, the horizontal main busbar 2 is fixed to the inner wall of the enclosure 1 by multiple insulators 11, which are spaced apart along the length of the horizontal main busbar 2. One end of each insulator 11 is connected to the back plate or side plate of the enclosure 1 by fasteners, and the other end is connected to the side or bottom surface of the horizontal main busbar 2, so that the horizontal main busbar 2 is suspended inside the enclosure 1 by multiple points of support. During assembly, the insulators 11 are first fixed in the predetermined mounting holes on the inner wall of the enclosure 1, and then the horizontal main busbar 2 is placed on the connecting surface of the insulators 11 and locked with fasteners, thereby forming a continuous predetermined gap between the horizontal main busbar 2 and the inner wall of the enclosure 1. During operation, the horizontal main busbar 2 maintains a stable posture under the support of the insulators 11. Even if the enclosure 1 is subjected to vibration or external impact, the horizontal main busbar 2 and the enclosure 1 still maintain a fixed distance and electrical insulation, thereby ensuring that the main power supply channel is in a stable state both mechanically and electrically.

[0031] Furthermore, such as Figure 1 and Figure 2As shown, the main disconnect switch 5 is mounted on a mounting plate inside the enclosure 1. The mounting plate is pre-fixed to the back panel area inside the enclosure 1. When assembling the main disconnect switch 5, the mounting holes of the main disconnect switch 5 are aligned with the holes on the mounting plate and then tightened with bolts, so that the operating handle of the main disconnect switch 5 faces the operating side of the enclosure 1. The incoming line interface 21 is connected to the input terminal of the main disconnect switch 5 through a conductor, and the output terminal of the main disconnect switch 5 is then connected to one end of the horizontal main busbar 2 through a copper busbar or wire, forming the incoming main circuit controlled by the main disconnect switch 5. The branch distribution circuit 20 includes a distribution busbar disposed in an insulating housing. The insulating housing is arranged along the length of the horizontal main busbar 2, and its back is connected to the inner wall of the enclosure 1 by fasteners, so that the distribution busbar and the horizontal main busbar 2 remain approximately parallel. During assembly, the distribution busbar is first installed inside the insulating housing, and then connected to the horizontal main busbar 2 through the lead-out terminal. When the main disconnect switch 5 is closed, the current enters the distribution busbar from the horizontal main busbar 2 through the lead-out terminal and is distributed along its length, providing a unified power busbar for each outgoing unit. This facilitates the isolation operation of the entire branch box through the main disconnect switch 5 under power failure conditions.

[0032] Furthermore, such as Figure 1 and Figure 4 As shown, each circuit breaker 7 is fixed to the front side of the insulating housing of the branch distribution circuit 20 via its bottom mounting structure. Multiple circuit breakers 7 are arranged in rows at intervals along the length of the branch distribution circuit 20. During assembly, the bottom mounting fasteners of the circuit breakers 7 are hooked onto the mounting surface or guide rail on the front side of the insulating housing, and then locked with fasteners to ensure that the circuit breakers 7 face the opening side of the enclosure 1 in the operating direction. Multiple leads of the distribution busbar are connected to the input terminals of each circuit breaker 7, and the output terminals of each circuit breaker 7 are connected to the corresponding output interfaces located at the bottom of the enclosure 1 via wires. During operation, when a circuit breaker 7 is in the closed state, the current on the distribution busbar flows through that circuit breaker 7 into the corresponding output interface and further to the corresponding AC charging pile; when the circuit breaker 7 is operated to the open state, the output circuit of that circuit is cut off while other circuits can still maintain power supply, thereby realizing independent connection, disconnection, and protection actions for multiple charging piles.

[0033] Furthermore, such as Figure 1As shown, the enclosure 1 contains a main neutral busbar 3 and a transition neutral busbar 4. The main neutral busbar 3 is fixed to a mounting plate near the back panel of the enclosure 1, arranged along the width of the enclosure 1. The transition neutral busbar 4 is fixed to the insulating shell of the branch distribution circuit 20, extending along the length of the branch distribution circuit 20. During assembly, the main neutral busbar 3 is first fixed to the mounting plate, and then the transition neutral busbar 4 is fixed to the front or lower side of the insulating shell. The transition neutral busbar 4 is connected to the main neutral busbar 3 through one or more conductors. The neutral conductor of the upstream power supply is connected to the main neutral busbar 3, and the neutral conductors of each outgoing cable are connected to the transition neutral busbar 4 in sequence. During operation, the neutral current returned by each AC charging pile first flows into the transition neutral busbar 4, then is concentrated to the main neutral busbar 3 through the connecting conductor, and finally returns to the upstream power supply, realizing centralized management of multiple neutral lines. By arranging the transition neutral busbar 4 close to the branch distribution circuit 20, the wiring length of the signal path and neutral branch can be shortened, making the neutral wiring hierarchy inside the enclosure clear.

[0034] Furthermore, such as Figure 1 and Figure 2 As shown, a protective grounding busbar 6 is installed inside the enclosure 1. The protective grounding busbar 6 is mounted on a PE busbar mounting bracket 61, which is fixed to the lower part of the inner wall of the enclosure 1 with fasteners. During assembly, the PE busbar mounting bracket 61 is first fixed to the reserved position on the inner wall of the enclosure 1, and then the protective grounding busbar 6 is fixed to the PE busbar mounting bracket 61 with bolts, so that the protective grounding busbar 6 extends laterally along the bottom or middle of the enclosure 1. The grounding conductor of the enclosure 1 and the grounding conductors in each outgoing cable are respectively connected to multiple grounding terminals of the protective grounding busbar 6. When an external equipment or cable experiences a ground fault, the fault current can be quickly collected to the protective grounding busbar 6 through the grounding conductor and discharged through the upper-level grounding system, thus forming a grounding network with the protective grounding busbar 6 as the central node, ensuring that the enclosure 1 and its internal electrical components are in a unified grounding state.

[0035] Furthermore, such as Figure 2 As shown, an insulating partition 8 is installed in front of the operating side of the horizontal main busbar 2 and the branch distribution circuit 20 inside the enclosure 1. The insulating partition 8 extends along the length of the horizontal main busbar 2 and the branch distribution circuit 20, and its upper and lower edges are detachably connected to the inner wall of the enclosure 1 by several fasteners. During assembly, the insulating partition 8 is positioned in front of the horizontal main busbar 2 and the branch distribution circuit 20, so that the insulating partition 8 and the enclosure 1 form a basically parallel baffle structure. During operation, when the enclosure 1 is in the open state, the operator first comes into contact with the insulating partition 8, while the horizontal main busbar 2, the branch distribution circuit 20, the main disconnect switch 5, and the circuit breaker 7 are located behind the insulating partition 8; only after confirming that the circuit is in a safe state can the insulating partition 8 be removed for maintenance of the internal busbar and circuit breaker, thus forming a fixed operating isolation interface in the structure and reducing the risk of accidental contact with live parts.

[0036] Furthermore, such as Figure 1 , Figure 2 and Figure 3 As shown, multiple waterproof cable connectors 12 are provided at the bottom of the enclosure 1 corresponding to the positions of each outgoing interface. Each outgoing interface corresponds one-to-one with the corresponding waterproof cable connector 12. The waterproof cable connectors 12 are installed on the bottom plate of the enclosure 1 and extend outward from the enclosure 1. During assembly, mounting holes that mate with the waterproof cable connectors 12 are first made on the bottom plate of the enclosure 1. The body of the waterproof cable connector 12 is inserted into the mounting hole from the outside or inside of the enclosure 1 and fixed by locking components, so that the two ends of the waterproof cable connector 12 are located on the inside and outside sides of the enclosure 1, respectively. Subsequently, cable fixing clips 13 are provided on the inside of each waterproof cable connector 12 at the bottom of the enclosure 1. The cable fixing clips 13 are arranged in a row at the bottom of the enclosure 1 and fixed to the bottom plate of the enclosure 1 by fasteners. During wiring, the cable led out from the outgoing terminal of each circuit breaker 7 is first connected to the corresponding outgoing interface, and then passes through the waterproof cable connector 12 opposite to the outgoing interface and extends outward from the enclosure 1. The cable introduced into the enclosure 1 from the waterproof cable connector 12 is further inserted into the corresponding cable fixing clip 13 and clamped and fixed. Thus, the waterproof cable connector 12 limits and seals the cable at the point where it exits the bottom plate of the enclosure 1, and the cable fixing clamp 13 supports and clamps the cable after it enters the enclosure 1, so that each cable forms a clearly defined and orderly outgoing structure in the bottom area of ​​the enclosure 1.

[0037] Furthermore, such as Figure 1 As shown, the upper part of the box 1 is provided with multiple hanging ears 14, which are fixed to the two sides or four corners of the upper part of the box 1. Each hanging ear 14 has a mounting hole for installing fasteners. During installation, the box 1 can be hung or fixed to a wall, column or bracket by passing fasteners through the mounting holes of the hanging ears 14. The bottom of the box 1 is provided with a base 15, which extends along the bottom of the box 1. The base 15 is also provided with fixing holes for connecting to the mounting base. When the branch box is floor-mounted or requires additional support, the base 15 can be connected to the ground or base through the fixing holes to provide vertical support for the box 1. In actual engineering, depending on the site conditions, it is possible to choose to use only the hanging ears 14 for wall-mounted installation, or to combine the hanging ears 14 with the base 15 for composite installation, to ensure the installation stability and vibration resistance of the branch box during long-term operation.

[0038] Example 2 like Figure 5 As shown, based on the same inventive concept as the above embodiments, the present invention also provides a power supply control method for a dedicated branch box for AC charging piles, comprising: S10: Obtain the access status information of the incoming interface.

[0039] Specifically, the wiring and energizing status of the upstream power supply cable connected to the incoming interface are obtained, the conductive connection relationship between the phase conductor at the incoming interface and the incoming interface is identified, and it is determined whether the incoming interface has been connected to the upstream power supply, whether the connected conductor is in a stable connection state, and whether the incoming circuit corresponding to the incoming interface has the conditions for power supply. The obtained incoming interface access status information is used as the basis for subsequent control of closing the main disconnect switch and establishing the main power supply path.

[0040] S20: Control the main disconnect switch to close according to the access status information and transmit power to the horizontal main busbar.

[0041] Specifically, after determining from the access status information that the incoming interface has completed the effective connection with the upstream power supply cable and that the incoming circuit is ready for power supply, the main disconnect switch set between the incoming interface and the horizontal main busbar is switched from the open state to the closed state, so that a continuously conducting main circuit channel is formed between the incoming interface and the horizontal main busbar. Thus, the electrical energy introduced from the upstream power supply side through the incoming interface is transmitted to the horizontal main busbar along the main disconnect switch, and the horizontal main busbar is put into a live state to serve as the main power supply carrier for subsequent branch power supply.

[0042] S30: Distribute electrical energy according to the electrical connection between the horizontal main busbar and the branch distribution circuit to obtain multiple branch power supply paths.

[0043] Specifically, after the horizontal main busbar enters the energized state, based on the existing electrical connection between the horizontal main busbar and the branch distribution circuit, the electrical energy in the horizontal main busbar is sent to the branch distribution circuit, so that the branch distribution circuit distributes the electrical energy from the horizontal main busbar along its length and leads the distributed electrical energy to the incoming side positions corresponding to multiple outgoing units, so as to form multiple corresponding branch power supply paths between the branch distribution circuit and each outgoing unit. Each branch power supply path corresponds to the circuit breaker and outgoing interface of an outgoing unit, which is used to establish an independent power supply path for the corresponding AC charging pile.

[0044] S40: Controls the output power of the outgoing interface according to the conduction status of the circuit breaker corresponding to each branch power supply path, and supplies power to another branch box of the same type according to the connection status of the expansion interface.

[0045] Specifically, the on / off status of the circuit breakers corresponding to each branch power supply path is identified. When the circuit breaker corresponding to a branch power supply path is in the on / off state, the output power of the outgoing interface corresponding to that branch power supply path is controlled to output power, so that the power is delivered to the corresponding AC charging pile through the outgoing interface and its connecting cable. When the circuit breaker corresponding to a branch power supply path is in the off / off state, the output power of the outgoing interface corresponding to that branch power supply path is stopped. At the same time, the connection status of the expansion interface is obtained. When the expansion interface has been connected to the main power supply circuit of another branch box of the same type through the cable, the power in the horizontal main busbar is output to the other branch box of the same type through the expansion interface, so that the other branch box of the same type can continue to establish the corresponding branch power supply path and supply power to its corresponding AC charging pile.

[0046] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A dedicated branch box for AC charging piles, characterized in that, It includes a housing (1), a main power supply circuit (10) disposed within the housing (1), a branch distribution circuit (20) electrically connected to the main power supply circuit (10), and multiple outgoing line units; The main power supply circuit (10) includes a horizontal main busbar (2) arranged horizontally inside the enclosure (1), an incoming line interface (21) at one end of the horizontal main busbar (2), an expansion interface (22) at the other end of the horizontal main busbar (2), and a main disconnect switch (5) between the incoming line interface (21) and the horizontal main busbar (2). The incoming line interface (21) and the expansion interface (22) are fixedly connected to the horizontal main busbar (2), and the expansion interface (22) is used to connect to the main power supply circuit (10) of another branch box of the same type via a cable. The branch distribution circuit (20) is disposed on one side of the horizontal main busbar (2) and electrically connected to the horizontal main busbar (2); The plurality of outgoing line units are spaced apart along the length of the branch distribution circuit (20). Each outgoing line unit includes a circuit breaker (7) installed on the branch distribution circuit (20) and an outgoing line interface electrically connected to the circuit breaker (7). The outgoing line interface is located at the bottom of the housing (1).

2. The AC charging pile dedicated branch box according to claim 1, characterized in that, The horizontal main busbar (2) is fixed to the inner wall of the box (1) by a plurality of insulators (11). The insulators (11) are arranged at intervals along the length of the horizontal main busbar (2) so that a predetermined gap is formed between the horizontal main busbar (2) and the box (1).

3. The AC charging pile dedicated branch box according to claim 1, characterized in that, The main disconnect switch (5) is installed on the mounting plate inside the enclosure (1); The branch distribution circuit (20) includes a distribution busbar disposed in an insulating housing, the insulating housing being fixed inside the housing (1) and arranged parallel to the horizontal main busbar (2).

4. The AC charging pile dedicated branch box according to claim 3, characterized in that, Each of the circuit breakers (7) is fixed to the insulating housing of the branch distribution circuit (20) by the mounting structure at its bottom. The incoming terminal of the circuit breaker (7) is electrically connected to the distribution busbar. Each of the circuit breakers (7) is arranged at intervals along the length of the branch distribution circuit (20).

5. The AC charging pile dedicated branch box according to claim 1, characterized in that, The enclosure (1) is provided with a main neutral busbar (3) and a transition neutral busbar (4). The main neutral busbar (3) is fixed on the mounting plate inside the enclosure (1). The transition neutral busbar (4) is fixed on the insulating shell of the branch distribution circuit (20). The transition neutral busbar (4) is electrically connected to the main neutral busbar (3) through a conductor. The neutral conductor of each of the outgoing units is connected to the transition neutral busbar (4) in sequence.

6. The AC charging pile dedicated branch box according to claim 1, characterized in that, The enclosure (1) is provided with a protective grounding bar (6), which is installed on a PE bar mounting bracket (61). The PE bar mounting bracket (61) is fixed on the inner wall of the enclosure (1). The protective grounding bar (6) is provided with multiple grounding terminals. The grounding conductors of the enclosure (1) and each of the outgoing line units are connected to the protective grounding bar (6).

7. The AC charging pile dedicated branch box according to claim 1, characterized in that, An insulating partition (8) is provided inside the housing (1) in front of the operation side of the horizontal main busbar (2) and the branch distribution circuit (20). The insulating partition (8) extends along the length direction of the horizontal main busbar (2) and the branch distribution circuit (20) and is detachably connected to the housing (1) by a fastener.

8. The AC charging pile dedicated branch box according to claim 1, characterized in that, The bottom of the enclosure (1) is provided with multiple waterproof cable connectors (12) corresponding to the positions of each of the outgoing interfaces. Each outgoing interface corresponds to the corresponding waterproof cable connector (12). The waterproof cable connector (12) is installed on the bottom plate of the enclosure (1) and extends outward from the enclosure. The cables led out from each of the circuit breakers (7) extend out of the enclosure (1) in sequence through the corresponding outgoing interface and the waterproof cable connector (12). The bottom of the housing (1) is provided with cable fixing clips (13) inside each of the waterproof cable connectors (12). The cable fixing clips (13) are arranged in a row at the bottom of the housing (1) and fixed to the bottom plate of the housing (1) by fasteners, for clamping the cables introduced from each of the waterproof cable connectors (12).

9. The AC charging pile dedicated branch box according to claim 1, characterized in that, The upper part of the box (1) is provided with a plurality of hanging ears (14), and the hanging ears (14) are provided with mounting holes for installing fasteners. The bottom of the box (1) is provided with a base (15), and the base (15) is provided with fixing holes for connecting with the mounting base surface.

10. A power supply control method for a dedicated branch box for AC charging piles according to any one of claims 1-9, characterized in that, The method includes: Obtain the access status information of the incoming interface; The main disconnect switch is closed according to the access status information, and electrical energy is transmitted to the horizontal main busbar; Based on the electrical connection between the horizontal main busbar and the branch distribution circuit, the electrical energy is distributed to obtain multiple branch power supply paths; The output power is controlled by the circuit breaker conduction status corresponding to each branch power supply path, and the power is supplied to another branch box of the same type according to the connection status of the expansion interface.