Header box and inverter system

Abstract

The utility model provides a combiner box and an inverter system. Each input port of the combiner box is connected with a corresponding bus in a bus bar through a corresponding fuse; the bus bar is connected with each output port of the combiner box through a switch module; moreover, the bus bar and the switch module are arranged in the cabinet. The fuses are respectively arranged on the box body wall of the case, so that one part of each fuse is located outside the case, the internal temperature rise of the fuses can be greatly reduced, the service life of the fuses is prolonged, and the heat problem and the problem of difficult heat dissipation in a row installation scheme in the prior art are further solved; in addition, a fuse base in the prior art is omitted, so that the size of the box body is reduced, and the cost of the whole machine is reduced. Moreover, the external cable is connected with the external fuse in a direct insertion connection mode, so that the process requirement on a construction site can be reduced.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a combiner box and an inverter system. Background Art

[0002] In existing DC combiner boxes, multiple fuses are generally installed in parallel. As the current of the photovoltaic modules connected to the combiner box increases, the heat generated by a single fuse will also increase. However, the solution of installing the fuses in parallel cannot solve the thermal problem of the fuses, resulting in a greatly reduced service life of the fuses. Alternatively, under the solution of installing the fuses in parallel, the cost of solving such thermal problems will be very high.

[0003] In addition, existing fuse installation solutions all use a fuse base as an installation accessory, which leads to problems such as large box size, high overall cost, and difficulty in heat dissipation. Utility Model Content

[0004] In view of this, the present application provides a combiner box and an inverter system to solve the thermal problems in the row installation scheme and the problems of large box volume, high whole machine cost and difficult heat dissipation.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] The present application provides a combiner box, comprising: a chassis, a combiner bus, a switch module and a plurality of fuses; wherein:

[0007] Each input port of the combiner box is connected to a corresponding busbar in the combiner busbars through the corresponding fuses;

[0008] The busbar is connected to the output ports of the combiner box through the switch module;

[0009] The busbar and the switch module are both arranged inside the chassis;

[0010] Each of the fuses is respectively arranged on the box wall of the box.

[0011] Optionally, the distance between adjacent fuses on the box wall is greater than a preset value.

[0012] Optionally, each input port of the combiner box is provided with a corresponding wiring terminal to achieve connection with external cables of the chassis.

[0013] Optionally, each of the fuses is integrated with the corresponding wiring terminal.

[0014] Optionally, each of the fuses is provided with a current sensor and / or an anti-reverse diode in a connecting branch with the corresponding busbar.

[0015] Optionally, the busbar includes: a positive busbar and a negative busbar;

[0016] The current sensor is arranged in the connecting branch between one pole busbar and each corresponding fuse;

[0017] The anti-reverse diode is arranged in the connecting branch between the other pole busbar and the corresponding fuses.

[0018] Optionally, each input port of the junction box is provided with a corresponding terminal block to realize the connection with the external cables of the chassis; and each fuse is connected to the corresponding busbar through a current sensor and / or an anti-reverse diode, so that each fuse is integrated into the same component with the devices connected on both sides thereof.

[0019] Optionally, it also includes: lightning protection module;

[0020] The busbar is grounded through the lightning protection module.

[0021] Optionally, it also includes: a monitoring module;

[0022] The monitoring module receives monitoring data information in the combiner box and is connected in communication with an external controller.

[0023] Optionally, the switch module is a circuit breaker or a load switch.

[0024] A second aspect of the present application provides an inverter system, comprising: an inverter and at least one combiner box as described in any one of the first aspects above;

[0025] Each input port of the combiner box is connected to a corresponding pole of a corresponding DC source;

[0026] Each output port of the combiner box is connected to a corresponding pole on the DC side of the inverter.

[0027] Optionally, when the combiner box includes a monitoring module, the monitoring module is communicatively connected to a controller in the inverter.

[0028] The junction box provided in the present application has each input port connected to the corresponding busbar in the junction busbar through a corresponding fuse; the junction busbar is connected to each output port of the junction box through a switch module; and the junction busbar and the switch module are both arranged inside the chassis; and each fuse is respectively arranged on the box wall of the chassis, so that a part of the fuse is outside the chassis, which can greatly reduce the internal temperature rise of the fuse and increase the service life of the fuse, thereby solving the thermal problem and heat dissipation difficulty under the row installation scheme in the prior art; in addition, the present application omits the fuse base in the prior art, thereby reducing the box volume and reducing the cost of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings to be used in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the structure of a combiner box provided in an embodiment of the present application;

[0031] Figure 2 Another structural schematic diagram of a combiner box provided in an embodiment of the present application;

[0032] Figure 3 Another structural schematic diagram of a combiner box provided in an embodiment of the present application;

[0033] Figure 4 Another structural schematic diagram of a combiner box provided in an embodiment of the present application;

[0034] Figure 5 Another structural schematic diagram of a combiner box provided in an embodiment of the present application;

[0035] Figure 6 Another structural schematic diagram of the combiner box provided in an embodiment of the present application. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] In this application, the terms "comprises", "comprising" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0038] The present application provides a combiner box to solve the thermal problem in a row installation scheme and the problems of large box volume, high whole machine cost and difficult heat dissipation.

[0039] See also Figure 1 The combiner box includes: a chassis (as shown in the largest dotted box in the figure), a busbar 20, a switch module 30 and a plurality of fuses 101; wherein:

[0040] Each input port of the combiner box is connected to the corresponding busbar in the combiner busbar 20 through the corresponding fuse 101; the combiner busbar 20 is connected to each output port of the combiner box through the switch module 30. In practical applications, the combiner box can be used in an inverter system, such as a photovoltaic inverter system; in this case, the input side of the combiner box will be provided with multiple pairs of input ports, each pair of input ports is respectively connected to the positive and negative poles of the corresponding photovoltaic string (PV1+ and PV1-, and PVn+ and PVn- as shown in the figure); the electric energy received by each input port passes through the combiner busbar 20 and the switch module 30 in turn, and is connected to the DC side of the inverter through the output side of the combiner box; the output side of the combiner box is provided with two output ports, which are respectively connected to the positive and negative poles of the DC side of the inverter (DC+ and DC- as shown in the figure).

[0041] Moreover, the busbar 20 and the switch module 30 are both arranged inside the chassis to achieve corresponding protection for both; and each fuse 101 is respectively arranged on the box wall of the chassis, which can greatly reduce the internal temperature rise of the fuse 101 and improve the service life of the fuse 101.

[0042] More preferably, the distance between adjacent fuses 101 on the box wall can be set to be greater than a preset value, so that each fuse 101 can dissipate heat more easily. The specific value of the preset value is not limited. As long as each fuse 101 is respectively set on the box wall of the chassis, the heat dissipation effect will be greatly improved compared with the solution of setting them in a row inside the chassis in the prior art; therefore, the distance between adjacent fuses 101 on the box wall can be determined according to the actual application environment, which is within the protection scope of this application. For example, the distance between adjacent fuses 101 on the box wall can be set to be maximized according to the device layout on the box wall of the chassis.

[0043] The combiner box provided in this embodiment has each input port connected to the corresponding busbar in the combiner bus 20 through the corresponding fuse 101; the combiner bus 20 is connected to each output port of the combiner box through the switch module 30; and the combiner bus 20 and the switch module 30 are both arranged inside the chassis; and each fuse 101 is respectively arranged on the box wall of the chassis, so that a part of the fuse 101 is outside the chassis, which can greatly reduce the internal temperature rise of the fuse 101 and increase the service life of the fuse 101, thereby solving the thermal problem and heat dissipation difficulty under the row installation scheme in the prior art.

[0044] In addition, the present embodiment omits the base of the fuse 101 in the prior art, thereby reducing the volume of the box and the cost of the entire device.

[0045] Based on the previous embodiment, this embodiment provides another combiner box, such as Figure 2 As shown in , each input port of the combiner box is provided with a corresponding wiring terminal 102 to achieve connection with external cables of the chassis (not shown in the figure).

[0046] In practical applications, each connection terminal 102 and the connected fuse 101 can be respectively arranged at different positions on the box wall of the chassis, as long as each connection terminal 102 can respectively realize the connection between the corresponding connected fuse 101 and the external cable.

[0047] More preferably, Figure 2 As shown in , each fuse 101 is integrated with the corresponding terminal 102; that is, each fuse 101 is implanted into the corresponding input port on the input side of the combiner box, so that the fuse 101 and the corresponding terminal 102 are arranged at the same position on the box wall of the chassis.

[0048] It is worth noting that when installing the combiner box at the construction site, there are certain requirements for the connection torque of the fuse and the protection of the box body. Therefore, the on-site construction process is required to be high. In the prior art, due to cost reasons, the input side of the combiner box uses waterproof terminals. The branch input side connection method of the waterproof terminal has high requirements for construction technology. If the on-site cable is connected to the fuse base, the torque is insufficient, which is very likely to cause arcing.

[0049] The present embodiment not only removes the base of the fuse, but also implants the fuse into the corresponding input port on the input side of the junction box and installs it on the chassis wall. This can not only greatly enhance the heat exchange between the fuse and the air, thereby reducing the heat of the fuse and increasing the service life of the fuse, but also enable the external cable to be connected only to the external fuse through a direct plug-in connection, thereby greatly reducing the process requirements for the construction site.

[0050] Based on the above embodiment, this embodiment provides another combiner box, see Figure 3 In the connection branch between each fuse 101 and the corresponding busbar, there are respectively provided: a current sensor and / or an anti-reverse diode.

[0051] Figure 3 The figure shows a preferred solution. In this case, the busbar 20 includes: a positive busbar 201 and a negative busbar 202; one of the busbars ( Figure 3 In the connecting branch of the positive busbar 201 and its corresponding fuses 101, a current sensor is provided; the other busbar ( Figure 3 In the connection branches between the negative busbar 202 and the corresponding fuses 101, anti-reverse diodes are provided.

[0052] In practical applications, a current sensor may be provided in the connection branch between the negative busbar 202 and its corresponding fuses 101, and an anti-reverse diode may be provided in the connection branch between the positive busbar 201 and its corresponding fuses 101, such as Figure 4 As shown in ; or, a current sensor and an anti-reverse diode (not shown) may be respectively provided in the connecting branch between each busbar and its corresponding fuse 101; this is not limited here and depends on the specific application environment.

[0053] The current sensor in each connecting branch can realize the current collection and uploading of the input of this route, which can specifically adopt a Hall sensor; the anti-reverse diode in each connecting branch can prevent the reverse access of the input of this route and avoid reverse connection fault.

[0054] In combination with the previous embodiment, each input port of the combiner box can be provided with a corresponding connection terminal 102 to achieve connection with the chassis ( Figure 3 At the same time, each fuse 101 can also be connected to the corresponding busbar through a current sensor and / or an anti-reverse diode, so each fuse 101 and the devices connected to its two sides are integrated into the same component, such as Figure 3 External fuse 1 and external fuse 2 as shown in , or Figure 4 The external fuse 3 and the external fuse 4 shown in FIG.

[0055] by Figure 3Taking the structure shown as an example, the external fuse 1 is integrated with the fuse 101, the terminal 102, and the Hall sensor, which can realize the functions of cable protection, branch current detection, and easy plugging and unplugging of photovoltaic module cables. In practical applications, the external fuse 1 is placed on the wall of the chassis, and the spacing between each external fuse 1 can be adjusted to the maximum; after each external fuse 1 is installed, it will be partially located outside the chassis, which can greatly reduce the problem of short life caused by heating of the fuse 101. Compared with the fuse base solution used in the traditional junction box, it can reduce the box volume and reduce the cost of the whole machine.

[0056] The external fuse 2 is integrated with the fuse 101, the terminal 102 and the anti-reverse diode, which can realize the functions of cable protection, anti-positive and negative reverse connection, and easy plugging and unplugging of photovoltaic module cables. Its installation and advantages can be found in the above description of the external fuse 1, which will not be repeated here.

[0057] Figure 4 The functions, installation and advantages of the external fuse 3 shown in Figure 3 The external fuse 2 shown in FIG. 1 is only that the conduction direction of the anti-reverse diode is opposite; Figure 4 The functions, installation and advantages of the external fuse 4 shown in FIG. are equivalent to Figure 3 The external fuse 1 shown in the figure; that is, the current detection function is placed at the negative pole of the combiner box and the anti-reverse function is placed at the positive pole of the combiner box, which will not be described here.

[0058] In this embodiment, the module with integrated fuse, terminal block and Hall sensor or anti-reverse diode is installed in the best heat dissipation method, so that the temperature of the fuse can be reduced, thereby increasing the service life of the fuse, while reducing the size of the box and reducing costs.

[0059] In addition, the above-mentioned integrated module can connect the fuse to the photovoltaic module by direct connection outside the box, thereby reducing the process requirements for on-site construction.

[0060] On the basis of the above embodiments, this embodiment provides some more detailed examples for the implementation of the combiner box. For example, the switch module 30 can be implemented by a circuit breaker or a load switch. Figures 1 to 4 As shown in , corresponding switches can be respectively provided in the transmission branches of the corresponding output ports of each busbar connection combiner box to realize on-off control of each busbar transmission branch.

[0061] Also, see Figure 5 (In Figure 3The combiner box may further include a lightning protection module 40; at this time, the busbar 20 is grounded through the lightning protection module 40. The specific structure and working principle of the lightning protection module 40 are the same as those in the prior art, and will not be described in detail here.

[0062] Furthermore, see Figure 6 (In Figure 5 The combiner box may further include: a monitoring module 50; the monitoring module 50 is used to receive monitoring data information in the combiner box and communicate with an external controller. In a photovoltaic inverter system, the external controller is a controller in the inverter.

[0063] by Figure 6 The structure shown is taken as an example for explanation. The combiner box specifically includes: a monitoring module 50, a switch module 30, a lightning protection module 40, n external fuses 1 and n external fuses 2.

[0064] Among them, the external fuse 1 is used to realize the access of the positive pole of the corresponding photovoltaic component (that is, the corresponding one of PV1+ to PVn+ shown in the figure), and the external fuse 2 is used to realize the access of the negative pole of the corresponding photovoltaic component (that is, the corresponding one of PV1- to PVn- shown in the figure); the value of n is determined according to the actual application environment and is not limited here; in addition, the introduction of the external fuse 1 and the external fuse 2 can be referred to the above embodiment and will not be repeated here.

[0065] The monitoring module 50 is used to complete the collection (including current sampling and voltage sampling shown in the figure) and processing of all monitoring data in the intelligent combiner box, and can exchange data with the inverter through wired communication, such as 485.

[0066] The switch module 30 is used as the total output switch after the junction, and the lightning protection module 40 is used to prevent the junction box from failing due to lightning strikes. The functional implementation processes of both can refer to the prior art and will not be described in detail here.

[0067] Figure 6 The combiner box shown is a DC intelligent combiner box with an external fuse, which can monitor data such as current, voltage, temperature, switch status, lightning protection status, etc., and can also effectively prevent whole machine failure or even burnout caused by reverse connection of positive and negative poles.

[0068] Another embodiment of the present application further provides an inverter system, which includes: an inverter and at least one combiner box as described in any of the above embodiments; each input port of the combiner box is connected to the corresponding pole of the corresponding DC source; each output port of the combiner box is connected to the corresponding pole of the DC side of the inverter. The DC source may refer to a photovoltaic string, in which case the inverter system is the photovoltaic inverter system described in the above embodiments.

[0069] In addition, when the combiner box includes the monitoring module described in the above embodiment, the monitoring module is communicatively connected with the controller in the inverter.

[0070] For the specific structural arrangement of the combiner box, reference may be made to the above embodiments and will not be repeated here.

[0071] The inverter system provided in this embodiment, by adopting the above-mentioned junction box, can increase the service life of the fuse, and can also reduce the volume of the box and reduce the cost of the whole machine; in addition, it can also be connected in a direct plug-in manner so that the external cable only needs to be connected to the external fuse, thereby reducing the process requirements for the construction site.

[0072] The same and similar parts between the various embodiments in this specification can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0073] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present utility model.

[0074] With respect to the above description of the disclosed embodiments, the features described in the embodiments in this specification may be replaced or combined with each other, so that professionals in the field can implement or use the present utility model. Various modifications to these embodiments will be apparent to professionals in the field, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but shall conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A combiner box, characterized in that: include: A chassis, a busbar, a switch module and a plurality of fuses; wherein: Each input port of the combiner box is connected to a corresponding busbar in the combiner busbars through the corresponding fuses; The busbar is connected to the output ports of the combiner box through the switch module; The busbar and the switch module are both arranged inside the chassis; Each of the fuses is respectively arranged on the box wall of the box.

2. The combiner box according to claim 1, characterized in that: The distance between adjacent fuses on the box wall is greater than a preset value.

3. The combiner box according to claim 1, characterized in that: Each input port of the combiner box is provided with a corresponding wiring terminal to achieve connection with the external cables of the chassis.

4. The combiner box according to claim 3, characterized in that: Each of the fuses is integrated with the corresponding wiring terminal.

5. The combiner box according to claim 1, characterized in that: Each of the fuses is provided with a current sensor and / or an anti-reverse diode in a connecting branch with the corresponding busbar.

6. The combiner box according to claim 5, characterized in that: The busbar includes a positive busbar and a negative busbar; The current sensor is arranged in the connecting branch between one pole busbar and each corresponding fuse; The anti-reverse diode is arranged in the connecting branch between the other pole busbar and the corresponding fuses.

7. The combiner box according to claim 1, characterized in that: Each input port of the combiner box is provided with a corresponding terminal block to realize the connection with the external cables of the chassis; and each fuse is connected to the corresponding busbar through a current sensor and / or an anti-reverse diode, so each fuse is integrated into the same component with the devices connected on both sides thereof.

8. The combiner box according to any one of claims 1 to 7, characterized in that: Also includes: Lightning protection module; The busbar is grounded through the lightning protection module.

9. The combiner box according to any one of claims 1 to 7, characterized in that: Also includes: Monitoring module; The monitoring module receives monitoring data information in the combiner box and is connected in communication with an external controller.

10. The combiner box according to any one of claims 1 to 7, characterized in that: The switch module is: a circuit breaker or a load switch.

11. An inverter system, characterized in that: include: An inverter and at least one combiner box according to any one of claims 1 to 10; Each input port of the combiner box is connected to a corresponding pole of a corresponding DC source; Each output port of the combiner box is connected to a corresponding pole on the DC side of the inverter.

12. The inverter system according to claim 11, characterized in that: When the combiner box includes a monitoring module, the monitoring module is communicatively connected with the controller in the inverter.

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