JP5948621B2 - Current collection box for solar power generation system - Google Patents

Current collection box for solar power generation system Download PDF

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JP5948621B2
JP5948621B2 JP2012008649A JP2012008649A JP5948621B2 JP 5948621 B2 JP5948621 B2 JP 5948621B2 JP 2012008649 A JP2012008649 A JP 2012008649A JP 2012008649 A JP2012008649 A JP 2012008649A JP 5948621 B2 JP5948621 B2 JP 5948621B2
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backflow prevention
device mounting
power generation
generation system
mounting plate
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JP2013149766A (en
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松隈　裕史
裕史 松隈
健次 田中
健次 田中
弘明 丸岡
弘明 丸岡
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Nitto Kogyo Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

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Description

本発明は、太陽光発電システム用集電ボックスに関するものである。   The present invention relates to a current collection box for a solar power generation system.

太陽光発電システム用直流集電ボックス内には、太陽電池の各ストリング、すなわち太陽電池セルを必要な直流電圧が得られるように直列接続したモジュール群毎にそれぞれ開閉器、逆流防止用ダイオードと、それらを集電する集電開閉器を備えている。これらの内部機器のうち、特に逆流防止用ダイオードからの発熱は、周辺部材の寿命を損なう要因となりうる。   In the DC current collection box for the solar power generation system, each string of solar cells, that is, a switch for each group of modules connected in series so that a necessary DC voltage can be obtained, a backflow prevention diode, It has a current collector switch that collects them. Of these internal devices, heat generated from the backflow prevention diode, in particular, can be a factor that impairs the life of the peripheral members.

この問題を回避し、太陽光発電システム用直流集電装置内の放熱効果の向上を図るために、内部機器の取付に使用する内部機器取付板全体を、熱伝導性の高い部材から構成する技術が一般に採用されている。更に、高コストの放熱部材の使用量を抑制しつつ、前記効果を得る技術として、内部機器取付板よりも高い熱伝導率を有し、かつ、内部機器取付板よりもコンパクトな放熱板上に、全ての逆流防止用ダイオードをまとめて搭載した上で、該放熱板を載置した内部機器取付板を筐体に当接させて、筐体全体から放熱を行わせる構造も開示されている（特許文献１）。   In order to avoid this problem and to improve the heat dissipation effect in the DC current collector for the photovoltaic power generation system, a technology for configuring the entire internal device mounting plate used for mounting the internal device from members having high thermal conductivity Is generally adopted. Furthermore, as a technology for obtaining the above-mentioned effect while suppressing the amount of use of a high-cost heat radiating member, it has a higher thermal conductivity than the internal device mounting plate and is more compact than the internal device mounting plate. In addition, a structure is also disclosed in which after all the backflow prevention diodes are mounted together, the internal device mounting plate on which the heat radiating plate is placed is brought into contact with the housing to radiate heat from the entire housing ( Patent Document 1).

しかし、従来の構造では、何れも、全ての逆流防止用ダイオードが、一枚の高熱伝導性部材の上に搭載されていたため、高熱伝導性部材を通じて、逆流防止用ダイオード間にも伝熱が生じ、これにより逆流防止用ダイオードの製品寿命が低下する問題があった。   However, in all the conventional structures, since all the backflow prevention diodes are mounted on a single high thermal conductivity member, heat transfer occurs between the backflow prevention diodes through the high thermal conductivity member. As a result, there is a problem that the product life of the backflow prevention diode is reduced.

特開２０１０-２７２５５９号公報JP 2010-272559 A

本発明の目的は前記の問題を解決し、機器取付板上に搭載される逆流防止用ダイオード間の伝熱量を低減する技術を提供することである。   An object of the present invention is to solve the above problems and provide a technique for reducing the amount of heat transfer between backflow prevention diodes mounted on a device mounting plate.

上記課題を解決するためになされた本発明の太陽光発電システム用集電ボックスは、筐体への放熱を行う放熱部を備えた機器取付板上に、複数の逆流防止ダイオードを搭載した太陽光発電システム用集電ボックスであって、筐体内に、逆流防止ダイオード搭載面の端部をコ字状に折り曲げて形成され、背面板上に配置される熱伝導面からなる放熱部を備えた機器取付板を少なくとも２以上備え、これら機器取付板の逆流防止ダイオード搭載面と背面板との間に空間を形成するとともに、複数の逆流防止ダイオードを、各機器取付板に分散して搭載したことを特徴とするものである。 The solar power generation system current collection box of the present invention made in order to solve the above problems is a solar power system in which a plurality of backflow prevention diodes are mounted on a device mounting plate provided with a heat radiation portion that radiates heat to a housing. A power collection box for a power generation system, wherein a device having a heat dissipation portion formed by bending an end portion of a backflow prevention diode mounting surface in a U-shape in a housing and comprising a heat conducting surface disposed on a back plate At least two mounting plates are provided, and a space is formed between the backflow prevention diode mounting surface and the back plate of these device mounting plates, and a plurality of backflow prevention diodes are distributed and mounted on each device mounting plate. It is a feature.

請求項２記載の発明は、請求項１記載の太陽光発電システム用集電ボックスにおいて、隣接する各機器取付板を、空間を持たせて配置したことを特徴とするものである。   The invention described in claim 2 is characterized in that, in the current collection box for solar power generation system described in claim 1, each adjacent device mounting plate is arranged with a space.

請求項３記載の発明は、請求項１または２記載の太陽光発電システム用集電ボックスにおいて、隣接する各機器取付板を、前記筐体内で上下に配置したことを特徴とするものである。   A third aspect of the present invention is the solar power generation system current collection box according to the first or second aspect, wherein the adjacent device mounting plates are arranged vertically in the casing.

請求項４記載の発明は、請求項１〜３の何れかに記載の太陽光発電システム用集電ボックスにおいて、前記熱伝導面を背面板上に配置したとき、各機器取付板の該逆流防止ダイオード搭載面が、各々、該背面板から異なる高さに位置することを特徴とするものである。 The invention of claim 4, wherein, in the solar collector box for the power generation system according to any one of claims 1 to 3, when placing the pre-Symbol heat conduction surface on the back plate, the reverse flow of the device mounting plate prevention diode mounting surfaces, respectively, is characterized in that located at a height that differs from said back plate.

本発明に係る太陽光発電システム用集電ボックスは、筐体内に、逆流防止ダイオード搭載面の端部をコ字状に折り曲げて形成され、背面板上に配置される熱伝導面からなる放熱部を備えた機器取付板を少なくとも２以上備え、これら機器取付板の逆流防止ダイオード搭載面と背面板との間に空間を形成するとともに、複数の逆流防止ダイオードを、各機器取付板に分散して搭載する構造により、異なる機器取付板に載置された逆流防止用ダイオードでは、伝熱が生じないようにして、他の逆流防止用ダイオードから発熱される熱に起因した製品寿命の低下率を軽減することができる。 A current collection box for a photovoltaic power generation system according to the present invention is formed in a housing by bending the end portion of the backflow prevention diode mounting surface into a U-shape and comprising a heat conducting surface disposed on the back plate. At least two or more device mounting plates are provided, and a space is formed between the backflow prevention diode mounting surface and the back plate of these device mounting plates, and a plurality of backflow prevention diodes are dispersed on each device mounting plate. Depending on the mounting structure, the backflow prevention diode mounted on a different device mounting plate prevents heat transfer and reduces the rate of product life reduction due to the heat generated by other backflow prevention diodes. can do.

逆流防止用ダイオードから発熱される熱は筐体の上方に向かうため、複数の逆流防止ダイオードを、一枚の機器取付板の上下位置に搭載した場合、機器取付板を介する伝熱の影響の他、下方に搭載した逆流防止ダイオードから発生した熱対流により、上方に搭載した逆流防止ダイオードがダメージを強く受け易くなる。これに対し、請求項３記載の発明のように、隣接する各機器取付板を、筐体内で上下に配置し、更に、請求項４記載の発明のように、上方と下方の機器取付板の、逆流防止ダイオード搭載面の高さ位置を異なるものとすることにより、上方に搭載した逆流防止ダイオードに対する、下方に搭載した逆流防止ダイオードからの発熱の影響を低減することができる。   Since the heat generated from the backflow prevention diode is directed upward from the housing, when multiple backflow prevention diodes are mounted on the top and bottom of a single device mounting plate, in addition to the effects of heat transfer through the device mounting plate, Due to the thermal convection generated from the backflow prevention diode mounted on the lower side, the backflow prevention diode mounted on the upper side is easily damaged. On the other hand, as in the invention described in claim 3, adjacent device mounting plates are arranged one above the other in the casing, and further, in the upper and lower device mounting plates, as in the invention described in claim 4. By making the height position of the backflow prevention diode mounting surface different, it is possible to reduce the influence of heat generation from the backflow prevention diode mounted on the lower side against the backflow prevention diode mounted on the upper side.

本発明に係る太陽光発電システム用集電ボックスの内部構造説明図である。It is internal structure explanatory drawing of the current collection box for photovoltaic power generation systems which concerns on this invention. 図１の正面方向から見た図である。It is the figure seen from the front direction of FIG. 機器取付板及び逆流防止ダイオードの関係を示す側面図である。It is a side view which shows the relationship between an apparatus mounting plate and a backflow prevention diode. 他の実施形態における機器取付板及び逆流防止ダイオードの関係を示す側面図である。It is a side view which shows the relationship between the apparatus mounting plate and backflow prevention diode in other embodiment. 他の実施形態における機器取付板及び逆流防止ダイオードの関係を示す側面図である。It is a side view which shows the relationship between the apparatus mounting plate and backflow prevention diode in other embodiment. 他の実施形態における太陽光発電システム用集電ボックスの正面図である。It is a front view of the current collection box for photovoltaic power generation systems in other embodiments.

以下に本発明の好ましい実施形態を示す。   Preferred embodiments of the present invention are shown below.

図１には、本発明の太陽光発電システム用集電ボックスの内部構造説明図を示し、図２には、図１の正面図を示している。   FIG. 1 shows an explanatory diagram of the internal structure of a current collection box for a photovoltaic power generation system of the present invention, and FIG. 2 shows a front view of FIG.

図１、図２に示すように、本発明の集電ボックス１の内部には、内部機器２の取付けに用いる機器取付板３が上下に２枚隣接配置されている。本実施形態では、機器取付板３の材料としてアルミ板を使用しているが、その他にも、銅板等、熱伝導率が高い金属板を材料として使用することができる。   As shown in FIGS. 1 and 2, two device mounting plates 3 used for mounting the internal device 2 are arranged adjacent to each other inside the current collection box 1 of the present invention. In the present embodiment, an aluminum plate is used as the material of the device mounting plate 3, but a metal plate having a high thermal conductivity such as a copper plate can also be used as the material.

各々の機器取付板３は、図３に示すように、内部機器２（２１、２２、２３、２４、２５）を取り付ける機器取付面３１と、機器取付面３１の端部をコ字状に折り曲げて形成した熱伝導面３２を有し、熱伝導面３２が、筐体１内の背面板４上に配置されている。当該構造によれば、内部機器２から発生した熱を、放熱部である熱伝導面３２を介して、筐体１内の背面板４から外部に速やかに放熱することができる。本実施形態では、図３に示すように、上下に配置した機器取付板３の熱伝導面３２を、各々筐体１の中央部に配置しているが、その他、熱伝導面３２を筐体１の端部に配置したり、あるいは、筐体１の中央部と端部の双方に配置する構造としてもよい。また、隣接する各機器取付板３間での伝熱を回避する観点から、隣接する各機器取付板３は、図４に示すように、空間を持たせて配置することが好ましい。   As shown in FIG. 3, each device mounting plate 3 has a device mounting surface 31 to which the internal device 2 (21, 22, 23, 24, 25) is mounted, and the end of the device mounting surface 31 is bent in a U shape. The heat conduction surface 32 is formed on the back plate 4 in the housing 1. According to this structure, the heat generated from the internal device 2 can be quickly radiated from the back plate 4 in the housing 1 to the outside via the heat conducting surface 32 that is a heat radiating portion. In the present embodiment, as shown in FIG. 3, the heat conduction surfaces 32 of the device mounting plates 3 arranged one above the other are arranged at the center of the casing 1. It is good also as a structure arrange | positioned in the edge part of 1 or both the center part and edge part of the housing | casing 1. FIG. Further, from the viewpoint of avoiding heat transfer between the adjacent device mounting plates 3, it is preferable that the adjacent device mounting plates 3 are arranged with a space as shown in FIG. 4.

なお、逆流防止用ダイオード２１から発熱される熱は筐体１の上方に向かうため、複数の逆流防止ダイオード２１を、一枚の機器取付板３の上下位置に全て搭載した場合、機器取付板３を介する伝熱の影響の他、下方に搭載した逆流防止ダイオード２１から発生した熱対流により、上方に搭載した逆流防止ダイオード２１がダメージを強く受け易くなる。本発明では前記のように、隣接する各機器取付板３を、筐体１内で上下に配置することにより、各機器取付板３を介する伝熱の影響の低減を図っているが、更に、図５に示すように、逆流防止ダイオード搭載面となる機器取付面３２の高さ位置を、下方の機器取付板は上方の機器取付板より高い位置に形成することにより、下方に搭載した逆流防止ダイオード２１から発生した熱対流が直接、上方に搭載した逆流防止ダイオード２１にぶつからない構造として、熱対流による影響の低減も合わせて図ることが好ましい。   Since the heat generated from the backflow prevention diode 21 is directed upward of the housing 1, when all of the plurality of backflow prevention diodes 21 are mounted on the upper and lower positions of the single device mounting plate 3, the device mounting plate 3. In addition to the influence of heat transfer through the heat exchanger, the backflow prevention diode 21 mounted on the upper side is easily damaged by heat convection generated from the backflow prevention diode 21 mounted on the lower side. In the present invention, as described above, each adjacent device mounting plate 3 is arranged vertically within the housing 1 to reduce the influence of heat transfer through each device mounting plate 3, As shown in FIG. 5, the device mounting surface 32, which serves as a backflow prevention diode mounting surface, is formed so that the lower device mounting plate is higher than the upper device mounting plate, thereby preventing the backflow prevention mounted below. As a structure in which the heat convection generated from the diode 21 does not directly collide with the backflow prevention diode 21 mounted above, it is preferable to reduce the influence of the heat convection.

機器取付面３２には、逆流防止ダイオード２１の他、集電開閉器２２、入力開閉器２３、銅バー２４、銅バー２５等の内部機器２が取り付けられており、各々を図示しない電線で接続し形成している。このうち、逆流防止ダイオード２１とは、太陽電池からパワーコンディショナー(住宅用分電盤)への一方向にのみ電流が流れるよう設定する機能を有するものであり、内部機器２の中で、最も発熱しやすい特性を備えるものである。   In addition to the backflow prevention diode 21, internal devices 2 such as a current collecting switch 22, an input switch 23, a copper bar 24, and a copper bar 25 are mounted on the device mounting surface 32. Forming. Among these, the backflow prevention diode 21 has a function of setting a current to flow only in one direction from the solar cell to the power conditioner (residential distribution board). It has the characteristic that it is easy to do.

逆流防止ダイオード２１は、太陽電池のストリング毎に備えられているため、通常、一つの集電ボックス１の内部に複数の逆流防止ダイオード２１が存在する。本発明では、これら複数の複数の逆流防止ダイオード２１を、２枚の機器取付板３に分けて搭載することにより、１枚の機器取付板３に搭載される逆流防止ダイオード２１の数を低減し、同一の機器取付板３上に載置された逆流防止ダイオード２１間での伝熱に起因した逆流防止ダイオード２１の製品寿命の低下を抑制可能としている。   Since the backflow prevention diode 21 is provided for each string of solar cells, normally, a plurality of backflow prevention diodes 21 exist inside one current collection box 1. In the present invention, the plurality of backflow prevention diodes 21 are separately mounted on the two device mounting plates 3 to reduce the number of backflow prevention diodes 21 mounted on one device mounting plate 3. The reduction in the product life of the backflow prevention diode 21 due to heat transfer between the backflow prevention diodes 21 placed on the same device mounting plate 3 can be suppressed.

上記実施形態では、機器取付板３を上下に隣接配置しているが、その他の実施形態として、図６に示すように、機器取付板３を左右に隣接配置することもできる。この場合も、隣接する機器取付板３は、図４に示すように、空間を持たせて配置することが好ましい。   In the above-described embodiment, the device mounting plate 3 is vertically adjacently arranged. However, as another embodiment, as shown in FIG. 6, the device mounting plate 3 can be adjacently disposed on the left and right. Also in this case, it is preferable to arrange the adjacent device mounting plates 3 with a space as shown in FIG.

１ 集電ボックス(筐体)
２ 内部機器
２１ 逆流防止ダイオード
２２ 集電開閉器
２３ 入力開閉器
２４ 銅バー
２５ 銅バー
３ 機器取付板
３１ 機器取付面
３２ 熱伝導面
４ 背面板
1 Current collection box (housing)
2 Internal device 21 Backflow prevention diode 22 Current collecting switch 23 Input switch 24 Copper bar 25 Copper bar 3 Device mounting plate 31 Device mounting surface 32 Heat conduction surface 4 Back plate

Claims (4)

筐体への放熱を行う放熱部を備えた機器取付板上に、複数の逆流防止ダイオードを搭載した太陽光発電システム用集電ボックスであって、
筐体内に、逆流防止ダイオード搭載面の端部をコ字状に折り曲げて形成され、背面板上に配置される熱伝導面からなる放熱部を備えた機器取付板を少なくとも２以上備え、これら機器取付板の逆流防止ダイオード搭載面と背面板との間に空間を形成するとともに、複数の逆流防止ダイオードを、各機器取付板に分散して搭載したことを特徴とする太陽光発電システム用集電ボックス。 A current collection box for a photovoltaic power generation system having a plurality of backflow prevention diodes mounted on a device mounting plate having a heat radiating part that radiates heat to the housing,
The housing is formed by bending the ends of the blocking diode mounting surface in a U-shape, comprising at least two devices mounting plate having a heat dissipating portion of a thermally conductive surface disposed on the back plate, these devices A collector for a photovoltaic power generation system, characterized in that a space is formed between the backflow prevention diode mounting surface of the mounting plate and the back plate, and a plurality of backflow prevention diodes are distributed and mounted on each device mounting plate. box. 隣接する各機器取付板を、空間を持たせて配置したことを特徴とする請求項１記載の太陽光発電システム用集電ボックス。   2. The current collecting box for a solar power generation system according to claim 1, wherein each of the adjacent device mounting plates is disposed with a space. 隣接する各機器取付板を、前記筐体内で上下に配置したことを特徴とする請求項１または２記載の太陽光発電システム用集電ボックス。   The collector box for a photovoltaic power generation system according to claim 1 or 2, wherein the adjacent device mounting plates are arranged vertically in the casing. 前記熱伝導面を背面板上に配置したとき、各機器取付板の該逆流防止ダイオード搭載面が、各々、該背面板から異なる高さに位置することを特徴とする請求項１〜３の何れかに記載の太陽光発電システム用集電ボックス。 The backflow prevention diode mounting surface of each device mounting plate is located at a different height from the back plate when the heat conducting surface is disposed on the back plate. A current collection box for a photovoltaic power generation system according to the above.
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JP5948621B2 true JP5948621B2 (en) 2016-07-06

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