JPS62293942A - Feeding system of dc power - Google Patents
Feeding system of dc powerInfo
- Publication number
- JPS62293942A JPS62293942A JP61136802A JP13680286A JPS62293942A JP S62293942 A JPS62293942 A JP S62293942A JP 61136802 A JP61136802 A JP 61136802A JP 13680286 A JP13680286 A JP 13680286A JP S62293942 A JPS62293942 A JP S62293942A
- Authority
- JP
- Japan
- Prior art keywords
- power
- load
- solar cell
- storage battery
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Landscapes
- Direct Current Feeding And Distribution (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】 ３、発明の詳細な説明 （産業上の利用分野） 本発明は、直流電力の給電システムにかかり。[Detailed description of the invention] 3. Detailed description of the invention (Industrial application field) The present invention relates to a DC power supply system.
詳しくは太陽電池の出力電力を負荷に効率よく供給する
ことができる給電システムに関する。Specifically, the present invention relates to a power supply system that can efficiently supply output power from a solar cell to a load.
（従来の技＃Ｉ）
従来、太陽電池を電源として直流負荷に給電するシステ
ムとしては、第４図に示すものが知られている。すなわ
ち、図においてＳＣは太陽電池、ＢＴは蓄電池、１１は
降圧チョッパ等の直流／直流変換袋＠（以下、必要に応
じて単にチョッパという）、１２は負荷であり、晴天の
日中時には太陽電池ＳＣからチョッパ１１を介して負荷
１２および蓄電池ＢＴに、小日射時には太ｖＬＢＩ電池
ＳＣおよびＦ［池ＢＴの双方から負荷１２に、また、夜
間時には蓄電池ＢＴのみから負荷１２にそれぞれ直流電
力が供給される。なお、チョッパ１１は太陽電池ＳＣの
出力電圧が常に最適動作電圧となるように動作する。(Conventional Technique #I) Conventionally, as a system for supplying power to a DC load using a solar cell as a power source, the system shown in FIG. 4 is known. That is, in the figure, SC is a solar cell, BT is a storage battery, 11 is a DC/DC conversion bag such as a step-down chopper (hereinafter simply referred to as a chopper if necessary), and 12 is a load, and during the daytime on a clear day, the solar cell DC power is supplied from the SC via the chopper 11 to the load 12 and the storage battery BT, during low solar radiation from both the thick VLBI battery SC and the F[pond BT], and at night from only the storage battery BT to the load 12. Ru. Note that the chopper 11 operates so that the output voltage of the solar cell SC always becomes the optimum operating voltage.
゛ここで、太陽電池ＳＣは１周知のように光照射量およ
び光起電素子の温度変化によって出力特性が異なってお
り、例えば光照射量をパラメータとした場合に第５図に
示すような出力特性を示す。゛Here, as is well known, the output characteristics of solar cells SC vary depending on the amount of light irradiation and the temperature change of the photovoltaic element. For example, when the amount of light irradiation is taken as a parameter, the output characteristics are as shown in Figure 5. Show characteristics.
この第５図において、電流−電圧特性は実線、電力−電
圧特性は破線にて表わされ、光照射量が増大するに従っ
て取り出し得るｆｆ１ＵＩｄおよび電力Ｐｄが増大する
。また、出力電力には光照射量に応じて最大出力電力点
Ｐ ｌ１１１＋ Ｐ ｍｘ ＋ Ｐ ｍ３・・・が存在
しており、これらの点を結ぶ最大電力曲線が存在する。In FIG. 5, the current-voltage characteristic is represented by a solid line, and the power-voltage characteristic is represented by a broken line, and as the amount of light irradiation increases, the extractable ff1UId and power Pd increase. Further, the output power has maximum output power points Pl111+Pmx+Pm3... depending on the amount of light irradiation, and there is a maximum power curve connecting these points.
従って、直流／直流変換装置１１により、太陽電池ＳＣ
の出力電圧Ｖｄを、光照射量が大のときの最大出力電力
点Ｐｍ１にほぼ対応する値（例えばＶｏｐ）に固定する
ことにより、常にほぼ最大の出力を得ることができる。Therefore, by the DC/DC converter 11, the solar cell SC
By fixing the output voltage Vd to a value (for example, Vop) that approximately corresponds to the maximum output power point Pm1 when the amount of light irradiation is large, it is possible to always obtain approximately the maximum output.
（発明が解決しようとする問題点）
しかるに、この従来の給電システムにおいては、太陽電
池ＳＣの出力が常にチョッパ１１を経由して負荷１２お
よび蓄電池ＢＴに供給されるため、太陽電池ＳＣの出力
電力に比例した電力がチョッパ１１における損失となり
、給電効率が悪いという問題があった。(Problem to be Solved by the Invention) However, in this conventional power supply system, since the output of the solar cell SC is always supplied to the load 12 and the storage battery BT via the chopper 11, the output power of the solar cell SC is There is a problem in that the power proportional to is a loss in the chopper 11, and the power feeding efficiency is poor.
すなわち、仮りに太陽電池ＳＣの出力電力をＡｋｗ、負
荷１２の消費電力をＢｋｔｚ、蓄電池ＢＴへの充電電力
をＣｋｗ、チョッパ１１における損失電力をＤｋｔｚと
すると、以下の関係式が成立する。That is, assuming that the output power of the solar cell SC is Akw, the power consumption of the load 12 is Bktz, the charging power to the storage battery BT is Ckw, and the power loss in the chopper 11 is Dktz, the following relational expression holds true.
Ａ−Ｄ＝Ｂ＋に こでチョッパ１１の変換効率を約９０％とすると。A-D=B+ Here, assuming that the conversion efficiency of the chopper 11 is approximately 90%.
Ｄ ＝ Ａ Ｘ （１−０，９） ＝０．ＩＡとなり、
太＠電池ＳＣの出力電力のうちの１０％が損失となって
しまう。D=AX(1-0,9)=0. Became an IA,
10% of the output power of the thick battery SC becomes a loss.
本発明は上記の問題点を解決するべく提案されたもので
、その目的とするところは、太陽電池の出力電力と負荷
消費電力との大小関係に応じて給電回路を切り替えるこ
とにより、チョッパ等の直流／直流変換装置での損失を
低減して給電効率を高め、太陽電池の有効利用を可能に
した構成簡単な直流電力の給電システムを提供すること
にある。The present invention was proposed to solve the above-mentioned problems, and its purpose is to switch the power supply circuit according to the magnitude relationship between the output power of the solar cell and the load power consumption. An object of the present invention is to provide a DC power supply system with a simple configuration that reduces loss in a DC/DC converter, increases power supply efficiency, and enables effective use of solar cells.
（問題点を解決するための手段）
上記目的を達成するため、本発明は、太Ｐ！電池と、こ
の太陽電池から降圧チョッパ等の直流／直流変換装置を
介して充電される蓄電池との何れか一方または双方にて
負荷に直流電力を供給する給電システムにおいて、太陽
電池の出力電力が負荷の消費電力よりも大きい時には、
太陽電池から負荷に直接給電すると共に太陽電池にて蓄
電池を充電する。(Means for Solving the Problems) In order to achieve the above object, the present invention provides TaiP! In a power supply system that supplies DC power to a load using either or both of a battery and a storage battery that is charged from the solar battery via a DC/DC converter such as a step-down chopper, the output power of the solar battery is When the power consumption is greater than the power consumption of
Power is supplied directly from the solar battery to the load, and the storage battery is charged using the solar battery.
また、太陽電池の出力電力が負荷の消費電力以下の時に
は、太陽電池の出力電力を直流／直流変換装置を介して
負荷に給電し、同時に蓄電池の出力電力を負荷に給電す
ることを特徴とする。Furthermore, when the output power of the solar cell is less than the power consumption of the load, the output power of the solar cell is supplied to the load via the DC/DC converter, and at the same time, the output power of the storage battery is supplied to the load. .
（作用） 本発明では、予め構成された給電システム内に。(effect) In the present invention, within a preconfigured power supply system.
接点の開閉によって２つの給電回路が選択的に形成され
る。これらの給電回路は、太陽電池の出力電力と負荷の
消費電力との大小関係により切り替えられるが、かかる
大小関係は給電システム内の蓄電池の充放電々流の存在
によって検出される。Two power supply circuits are selectively formed by opening and closing the contacts. These power supply circuits are switched depending on the magnitude relationship between the output power of the solar cell and the power consumption of the load, and this magnitude relationship is detected by the presence of charging and discharging currents of the storage battery in the power supply system.
すなわち、蓄電池への充電電流が存在する場合には、こ
の充電電流は太陽電池の余剰電力によるもので太陽電池
の出力電力が負荷の消費電力よりも大きいため、接点の
切り替えにより、太陽電池から直流／直流変換装置を介
することなく負荷に直接給電して直流／直流変換装置に
よる損失を低減する。In other words, when there is a charging current to the storage battery, this charging current is due to the surplus power of the solar cell and the output power of the solar cell is greater than the power consumption of the load. /Reducing loss caused by the DC/DC converter by supplying power directly to the load without going through the DC converter.
逆に、蓄電池からの放電電流が存在する場合には太陽電
池の出力電力が負荷の消費電力よりも小さいため、接点
を切り替え、従来と同様に太陽電池の出力電力を直流／
直流変換装置を介して最適動作電圧の近傍で負荷に給電
し、同時に蓄電池の電力を負荷に給電するものである。Conversely, when there is a discharge current from the storage battery, the output power of the solar cell is smaller than the power consumption of the load, so the contacts are switched and the output power of the solar cell is changed to DC/DC as in the conventional case.
Power is supplied to the load near the optimum operating voltage via the DC converter, and at the same time, power from the storage battery is supplied to the load.
（実施例） 以下１図に沿って本発明の一実施例を説明する。(Example) An embodiment of the present invention will be described below with reference to FIG.
第１図において、ＳＣは太陽電池、ＢＴは蓄電池であり
、これらの間には直流／直流変換装置（以下、単にチョ
ッパという）１が接続されている。In FIG. 1, SC is a solar cell, BT is a storage battery, and a DC/DC converter (hereinafter simply referred to as a chopper) 1 is connected between them.
また、太陽電池ＳＣには接点ＭＣ１を介して負荷２が接
続されていると共に、蓄電池ＢＴと負荷２との間には、
別の接点ＭＣ，および過充電防止用のダイオードＤ□か
らなる並列回路が接続されている。Further, a load 2 is connected to the solar cell SC via a contact MC1, and between the storage battery BT and the load 2,
A parallel circuit consisting of another contact MC and a diode D□ for overcharge prevention is connected.
この給電システムでは、接点ＭＣ，、ＭＣ２の切り替え
によって第２図および第３図の給電回路を実現すること
ができる。つまり、第２図は接点ＭＣ１がＯＮ、接点Ｍ
Ｃ２がＯＦＦの場合、第３図は接点ＭＣ工がＯＦＦ、接
点ＭＣ，がＯＮの場合である。このうち、第２図の回路
は太陽電池ＳＣの出力電力Ａが負荷２の消費電力Ｂより
も大きい場合（Ａ＞Ｂ：日中時、光照射量大、負荷小の
場合）に適用され、また、第３図の回路は上記出力電力
Ａが消費電力Ｂよりも小さいかあるいは両者が等しい場
合（Ａ≦Ｂ：夜間時、光照射量小、負荷大の場合）に適
用されるものとする。In this power supply system, the power supply circuits shown in FIGS. 2 and 3 can be realized by switching the contacts MC, MC2. In other words, in Fig. 2, contact MC1 is ON, contact M
When C2 is OFF, FIG. 3 shows the case where the contact MC is OFF and the contact MC is ON. Among these, the circuit shown in FIG. 2 is applied when the output power A of the solar cell SC is larger than the power consumption B of the load 2 (A>B: daytime, large amount of light irradiation, small load), Furthermore, the circuit shown in Fig. 3 is applied when the above output power A is smaller than the power consumption B or when both are equal (A≦B: at night, when the amount of light irradiation is small, and when the load is large). .
以上のような構成において、いま太陽電池ＳＣの出力電
力Ａ ” １１００ｋ 、負荷２の消費電力Ｂ＝８０に
νとした場合のチョッパ１の損失電力りおよび蓄電池Ｂ
Ｔの充電電力Ｃを従来例（第４図）と共に試算し、その
結果を表１に示す。なお１本発明については上述した原
理により第２図の給電回路が適用され、また、チョッパ
１の変換効率は９０％とした。In the above configuration, when the output power A of the solar cell SC is 1100k and the power consumption B of the load 2 is ν=80, the power loss of the chopper 1 and the storage battery B are
The charging power C of T was calculated together with the conventional example (FIG. 4), and the results are shown in Table 1. Regarding the present invention, the power supply circuit shown in FIG. 2 was applied according to the above-mentioned principle, and the conversion efficiency of the chopper 1 was set to 90%.
表１
この表から明らかなように１本発明ではチョッパ１の損
失電力りが従来例よりも８ｋｗも少なく、その分、充電
電力Ｃが増加している。損失電力りのみを比較すれば、
一般には（Ａ Ｘ （１−０，９）ｌ−（（Ａ −Ｂ
） ｘ （１−０，９））＝０．１ Ｂとなり、従来例
に比べて負荷２の消費電力Ｂの１０％分、損失電力りが
少なくなる。Table 1 As is clear from this table, in the present invention, the power loss of the chopper 1 is 8 kW less than in the conventional example, and the charging power C is increased accordingly. If we compare only the power loss,
In general, (A X (1-0,9)l-((A -B
) x (1-0,9))=0.1 B, and the power loss is reduced by 10% of the power consumption B of the load 2 compared to the conventional example.
この結果は、Ａ＞Ｂである時に、その大部分をチョッパ
１を介さずに負荷２に直接供給したことによるものであ
り１本発明によって損失を大幅に低減できることが確認
された。また、Ａ≦Ｂの時にはチョッパ１への入力電力
が比較的小さいから、第３図の回路によりチョッパ１を
介して負荷２に給電することとしても、損失は本来的に
少ないものである。This result is due to the fact that when A>B, most of the energy was directly supplied to the load 2 without going through the chopper 1, and it was confirmed that the present invention can significantly reduce the loss. Further, when A≦B, the input power to the chopper 1 is relatively small, so even if power is supplied to the load 2 via the chopper 1 using the circuit shown in FIG. 3, the loss is inherently small.
なお、給電回路の切り替えのタイミングは第２図および
第３図における蓄電池ＢＴの放電電流よりおよび充電電
流Ｉｓをそれぞれ検出して決定すればよい。つまり、第
２図の回路（Ａ＞Ｂであるべき状ｊＩ！＞において放電
電流Ｉｂが流れることはＡ≦Ｂの状態を意味するから、
二九を検出して第３図の回路に切り替える。この場合に
第２図の回路のままにしておくと、太陽電池ＳＣの出力
電圧は第５図のＶｏρから蓄電池ＢＴの端子電圧ｖｂｔ
に低下してしまい、出力効率が大幅に低下してしまうた
めである。The timing of switching the power supply circuit may be determined by detecting the discharge current and charging current Is of the storage battery BT in FIGS. 2 and 3, respectively. In other words, the flow of discharge current Ib in the circuit of FIG. 2 (in the state where A>B should be jI!> means that A≦B, so
29 is detected and switched to the circuit shown in Figure 3. In this case, if the circuit shown in Fig. 2 is left as is, the output voltage of the solar cell SC will be changed from Voρ in Fig. 5 to the terminal voltage vbt of the storage battery BT.
This is because the output efficiency decreases significantly.
また、第３図の回路（Ａ≦Ｂであるべき状態）において
充電電流Ｉｓが流わることはＡ＞Ｂの状態を意味するか
ら、これを検出して第２図の回路に切り替える。これに
より、チョッパ１での損失増加を防ぐことができる。Furthermore, since the charging current Is flowing in the circuit shown in FIG. 3 (a state in which A≦B should be satisfied) means a state in which A>B, this is detected and the circuit is switched to the circuit shown in FIG. Thereby, an increase in loss in the chopper 1 can be prevented.
（発明の効果）
以上詳述したように、本発明によれば、太陽電池の出力
電力が負荷の消費電力よりも大きい時には直流／直流変
換装置を介さずに負荷に給電するようにしたため、直流
／直流変換装置での損失を低減して給電効率を向上させ
、太陽電池の有効利用を図ることができる。(Effects of the Invention) As detailed above, according to the present invention, when the output power of the solar cell is larger than the power consumption of the load, power is supplied to the load without going through the DC/DC converter, so that the DC / It is possible to reduce loss in the DC converter, improve power supply efficiency, and effectively utilize solar cells.
また、極めて簡単な構成であるから、低コストにて実現
することができる。Furthermore, since it has an extremely simple configuration, it can be realized at low cost.
第１図は本発明の一実施例を示す給電システムの構成図
、第２図および第３図は第１図の給電システムに基づく
給電回路の構成図、第４図は従来例を示す構成図、第５
図は光照射量をパラメータとした太陽電池の出力特性図
である。Fig. 1 is a block diagram of a power supply system showing an embodiment of the present invention, Figs. 2 and 3 are block diagrams of a power supply circuit based on the power supply system of Fig. 1, and Fig. 4 is a block diagram showing a conventional example. , 5th
The figure is a diagram showing the output characteristics of a solar cell using the amount of light irradiation as a parameter.
Claims (1)
して充電される蓄電池との何れか一方または双方にて負
荷に直流電力を供給する給電システムにおいて、 太陽電池の出力電力が負荷の消費電力よりも大きい時に
は、太陽電池から負荷に直接給電すると共に蓄電池を充
電し、太陽電池の出力電力が負荷の消費電力以下の時に
は、蓄電池と、前記直流／直流変換装置を介した太陽電
池とから負荷に給電することを特徴とした直流電力の給
電システム。[Scope of Claims] In a power supply system that supplies DC power to a load using either or both of a solar cell and a storage battery charged from the solar cell via a DC/DC converter, the output of the solar cell When the power is larger than the power consumption of the load, the solar cell supplies power directly to the load and charges the storage battery, and when the output power of the solar cell is less than the power consumption of the load, power is supplied via the storage battery and the DC/DC converter. A DC power supply system characterized by supplying power to a load from solar cells.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61136802A JPH06106012B2 (en) | 1986-06-11 | 1986-06-11 | DC power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61136802A JPH06106012B2 (en) | 1986-06-11 | 1986-06-11 | DC power supply system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62293942A true JPS62293942A (en) | 1987-12-21 |
| JPH06106012B2 JPH06106012B2 (en) | 1994-12-21 |
Family
ID=15183857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61136802A Expired - Lifetime JPH06106012B2 (en) | 1986-06-11 | 1986-06-11 | DC power supply system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06106012B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63213431A (en) * | 1987-03-02 | 1988-09-06 | 宇宙開発事業団 | Electric source of satellite |
| JP2012010531A (en) * | 2010-06-28 | 2012-01-12 | Sharp Corp | Dc power distribution system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000102192A (en) * | 1998-09-24 | 2000-04-07 | Nippon Telegr & Teleph Corp <Ntt> | Standalone photovoltaic power generation system |
-
1986
- 1986-06-11 JP JP61136802A patent/JPH06106012B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63213431A (en) * | 1987-03-02 | 1988-09-06 | 宇宙開発事業団 | Electric source of satellite |
| JP2012010531A (en) * | 2010-06-28 | 2012-01-12 | Sharp Corp | Dc power distribution system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06106012B2 (en) | 1994-12-21 |
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