JP2004080942A - Chargeable power supply apparatus - Google Patents

Chargeable power supply apparatus Download PDF

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Publication number
JP2004080942A
JP2004080942A JP2002239710A JP2002239710A JP2004080942A JP 2004080942 A JP2004080942 A JP 2004080942A JP 2002239710 A JP2002239710 A JP 2002239710A JP 2002239710 A JP2002239710 A JP 2002239710A JP 2004080942 A JP2004080942 A JP 2004080942A
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Japan
Prior art keywords
electric double
power supply
voltage
double layer
layer capacitor
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JP2002239710A
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Japanese (ja)
Inventor
Ken Takara
高良　憲
Naofumi Mushiaki
虫明　直文
Akira Matsubara
松原　朗
Toyota Ikeuchi
池内　豊太
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SANBURIJJI KK
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SANBURIJJI KK
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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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chargeable power supply apparatus which is capable of charging and discharging, even if the input voltage from an external power supply apparatus is lower than the voltage required for charging a chargeable/dischargeable storage battery. <P>SOLUTION: This power supply apparatus is equipped with a boosting part 3 whose circuit is constituted, to enable the boosting of the voltage of the external power source 2, and it accumulates voltage higher than the input voltage of the external power source 2 into the chargeable/dischargeable storage battery 4 via the boosting part 3. The boosting part 3 includes electric double-layer capacitors 6 and 7, which can be connected in parallel with an external power source 2, and this power unit charges either of the electric double-layer capacitor 6 or 7 at all times, from the external power source 1. The electric double-layer capacitors 6 and 7 are arranged in series with the storage battery 4, and also the opposite side of the storage battery 4 is grounded. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、外部電源の入力電圧により蓄電池に対して蓄電する充放電可能な電源装置に関するものである。
【０００２】
【従来の技術】
この種の電源装置において、たとえば電気二重層コンデンサと充放電可能な蓄電池とを組み合わせた蓄電システムにより構成されたものが知られている。
【０００３】
【発明が解決しようとする課題】
しかしながら、従来の電源装置では、一般に、外部電源の入力電圧よりも電気二重層コンデンサの充電可能電圧は低くなる。そして、さらに後段の充放電可能な蓄電池の充電可能電圧は低くなってしまう。
【０００４】
本発明はかかる実情に鑑み、外部電源からの入力電圧が充放電可能な蓄電池の充電に必要な電圧よりも低い場合でも充電可能な電源装置を提供することを目的とする。
【０００５】
【課題を解決するための手段】
本発明の充放電可能な電源装置は、外部電源の電圧を昇圧可能となるように回路構成された昇圧部を備え、この昇圧部を介して外部電源の入力電圧よりも高い電圧の充放電可能な蓄電池に対して蓄電できるようにしたことを特徴とする。
【０００６】
本発明の充放電可能な電源装置において、前記昇圧部として、好ましくは、前記外部電源に対して並列に接続し得る第１の電気二重層コンデンサと第２の電気二重層コンデンサとを含み、前記外部電源から常にいずれか一方の電気二重層コンデンサに充電しているよう構成される。
【０００７】
本発明の充放電可能な電源装置において、前記第１の電気二重層コンデンサと前記第２の電気二重層コンデンサは、好ましくは、前記蓄電池に対して直列に配置され、かつ前記蓄電池の反対側はアース接続されている。
【０００８】
また、本発明の充放電可能な電源装置において、前記第１の電気二重層コンデンサの電圧と前記第２の電気二重層コンデンサの電圧を比較することにより、前記第１の電気二重層コンデンサおよび前記第２の電気二重層コンデンサの充電切替えが行なわれるようにすれば好ましい。
【０００９】
本発明によれば、個別に充電される２つの電気二重層コンデンサを蓄電池に対して直列に配置することで、外部電源の入力電圧よりも高い電圧の充放電可能な蓄電池に対して蓄電することができる。
【００１０】
【発明の実施の形態】
以下、図面に基づき、本発明による充放電可能な電源装置の好適な実施の形態を説明する。
図１は、本発明の実施の形態におけるシステム構成例を示している。図において、本発明による充放電可能な電源装置１（図中の点線で囲んだ領域）は、外部電源２の電圧を昇圧可能となるように回路構成された昇圧部３（図中の一点鎖線で囲んだ領域）とを備え、この昇圧部３を介して外部電源２の入力電圧よりも高い電圧を充放電可能な蓄電池４（蓄電部）に対して蓄電できるようにしたものである。この蓄電池４には、負荷５が接続されている。
【００１１】
昇圧部３は、外部電源２に対して並列に接続し得る第１の電気二重層コンデンサ６と第２の電気二重層コンデンサ７とを含み、これらの電気二重層コンデンサ６及び７は、昇圧部の切替えスイッチ８，９によって外部電源２と切替え接続されるようになっている。
第１の電気二重層コンデンサ６の電圧Ｖｃ１と第２の電気二重層コンデンサ７の電圧Ｖｃ２につき、Ｖｃ１＋Ｖｃ２は電圧検出器１０によって検出され、また、電気二重層コンデンサ６の電圧は電圧検出器１１によって検出される。検出された電圧は、それぞれ１０Ａ，１１Ａとして演算回路１２に入力されて演算処理され、その出力１２Ａが、スイッチ回路１３に出力される。さらにスイッチ回路１３からの命令が、切替えスイッチ８，９が切替え制御されるように、信号１３Ａ，１３Ｂにより駆動制御されるようになっている。
【００１２】
ここで、第１の電気二重層コンデンサ６と第２の電気二重層コンデンサ７は、蓄電池４に対して直列に配置されており、かつ蓄電池４の反対側はアース接続されている。
【００１３】
後述のように、第１の電気二重層コンデンサ６の電圧Ｖｃ１と第２の電気二重層コンデンサ７の電圧Ｖｃ２とを比較することにより、第１の電気二重層コンデンサ６および第２の電気二重層コンデンサ７の充電切替えが行なわれる。
【００１４】
次に、昇圧部の回路について説明する。
図１において、スイッチ８を接点８Ａ側、スイッチ９を接点９Ａにすると、外部電源２からの電流は電気二重層コンデンサ６を充電する。また、スイッチ８を接点８Ｂ側、スイッチ９を接点９Ｂ側にすると、外部電源２からの電流は電気二重層コンデンサ７を充電する。
ここで、第１の電気二重層コンデンサ６と第２の電気二重層コンデンサ７との切替えは、第１の電気二重層コンデンサ６の電圧Ｖｃ１と第２の電気二重層コンデンサ７の電圧Ｖｃ２の電圧を比較することにより行われる。図１では、電圧検出器１０によりＶｃ１＋Ｖｃ２の電圧を、また電圧検出器１１によりＶｃ２の電圧を検出することができる。よって、Ｖｃ１の電圧も知ることができる。
蓄電池４の電圧は、電圧検出器１４によって検出され、その出力１４Ａを、演算回路１２に加え、スイッチ回路１３を制御できる。
【００１５】
外部電源２の必要電圧は、２つの電気二重層コンデンサ６，７を切り替えながら１つずつの電気二重層コンデンサを充電するため、電気二重層コンデンサ１つ分を充電できる電圧（Ｖｃ）があれば良い。２つの電気二重層コンデンサ６，７の容量と、電圧の定格が同じであれば、満充電すると、これらの電気二重層コンデンサを直列接続した電圧の２Ｖｃを、蓄電池４に印加することができる。
本発明の充放電可能な電源装置は、上記のように構成され、外部電源２から充電できる電気二重層コンデンサ６，７を備え、この充電電圧を直列接続して、外部電源２の電圧よりも高い電圧を、充放電可能な蓄電池４に対して充電することができる。
【００１６】
【実施例】
ここで、本発明における具体的な実施例を説明する。
図２は本発明の実施例である。図において、外部電源１は、太陽電池２０を使用した本発明による充放電可能な電源装置１である。図２に示すように、電気二重層コンデンサ６及び７を充電するときは、スイッチ８，９により個別に太陽電池２０に接続し、それぞれの電気二重層コンデンサ６，７を交互に充電する。また、電気二重層コンデンサ６，７から放電するときは、２直列として放電して、後段のニッケル水素電池４Ａ（充放電可能な蓄電池）に電気を移動する。
【００１７】
太陽電池２０としては、３．５Ｖ−１００ｍＡを用いた。また、電気二重層コンデンサ６，７として２．３Ｖ−５Ｆを２個、ニッケル水素電池４Ａとして定格電圧１．２Ｖ−７００ｍＡｈのものを２直列してなる２．４Ｖ―７００ｍＡｈを用いた。
【００１８】
太陽電池２０の規格としては、曇天時あるいは雨天時でも電気二重層コンデンサ６，７を充電可能な３．５Ｖ以上の電圧が好ましい。現行の有機電解液系の電気二重層コンデンサの定格電圧は、単セルあたり２．３Ｖ〜２．７Ｖが主流である。コストを考えると太陽電池２０の規格は、３．５〜４Ｖあれば十分である。また、水溶液系の電気二重層コンデンサの定格電圧は、単セルあたり０．８Ｖ〜１．１Ｖが主流であり、単体あるいは直列接続により電圧調整して用いるため、これに合わせた太陽電池の規格設定を行う。また、電流値は、例えば１日に蓄電する容量に応じて適宜決定される。
【００１９】
電気二重層コンデンサ６，７の規格としては、２直列にしたときに、後段に配置される蓄電池であるニッケル水素電池４Ａの充電ができるように蓄電池の充電終止電圧以上であることが必要である。ニッケル水素電池４Ａとして、定格２．４Ｖ―７００ｍＡｈ（２直列）を用いる場合、その終止電圧は常温で３．０Ｖあたりとなる。実際の充電完了のための検出は、従来より用いられている方法をいくつか併用することが好ましい。
電気二重層コンデンサ６，７に定格２．３Ｖを用いれば、２個直列時に満充電すると４．６Ｖとなり、後段のニッケル水素電池を十分充電できる電圧となる。太陽電池２０で電気二重層コンデンサ６，７を充電するときの電圧は、１つの電気二重層コンデンサに対して、満充電である２．３Ｖまでする必要はない。本発明では、電気二重層コンデンサ６，７の２直列で、後段のニッケル水素電池４Ａの充電終止電圧（常温で３．０Ｖ付近）より高い電圧であればよい。
【００２０】
つまり電気二重層コンデンサ６，７の１個あたり１．５Ｖ以上の充電が行われれば、２直列で３．０Ｖを越えるため、後段のニッケル水素電池４Ａに対しての充電は可能である。電気二重層コンデンサ６，７の充電電圧については、電圧が高ければ高いほど後段の蓄電池４Ａへの充電がし易くなる。
【００２１】
ここでさらに、本発明に対する比較例を説明する。
（比較例１）
図３は、太陽電池を外部電源とした従来例１の充放電可能な電源の比較例である。従来例１の充放電可能な電源３０は、外部電源としての太陽電池３１から充電される電気二重層コンデンサ３２が、電圧を調整するＤＣ／ＤＣコンバータ３３を介して、充放電可能な蓄電池３４に接続されている。
電気二重層コンデンサ３２と蓄電池３４の充放電電圧は、それぞれ、電圧検出器３５，３６に監視されている。図示しないが、これらの電圧検出器３５，３６の出力は制御回路に入力され、電気二重層コンデンサが３２が満充電になったときに、スイッチ３７をオンにするように駆動する。また、蓄電池３４には、図示しない負荷が接続されている。
【００２２】
ここで、太陽電池３１として、３．５Ｖ−１００ｍＡ、電気二重層コンデンサ３２として２．３Ｖ−５Ｆ、充放電可能な蓄電池３４として、２．４Ｖ（１．２Ｖを２直列）−７００ｍＡｈのニッケル水素電池を配置した場合を例にとる。この例では、電気二重層コンデンサ３２とニッケル水素電池３４との間には、ＤＣ／ＤＣコンバータ３３が必要であり、この場合には、ＤＣ／ＤＣコンバータ３３には、太陽電池の入力電圧の約３０％のロスが発生した。
【００２３】
（比較例２）
図４は、太陽電池を外部電源とした従来例２の充放電可能な電源の比較例である。従来例２の充放電可能な電源４０は、図３の比較例の構成において、ＤＣ／ＤＣコンバータ３３を使用しないで、太陽電池３１と、電気二重層コンデンサ３２を、それぞれ２個直列接続している。他の構成要素は、図３と同一であるので説明は省略する。
【００２４】
太陽電池３１として、３．５Ｖ−１００ｍＡを２個直列接続し、７Ｖ−１００ｍＡｈの容量であった。電気二重層コンデンサ３２として、２．３Ｖ−５Ｆの２本直列接続して、４．６Ｖ−２．５Ｆの容量とした。ニッケル水素電池３４は、２．４Ｖ（１．２Ｖを２直列）−７００ｍＡｈの容量であった。
【００２５】
この例のようにＤＣ／ＤＣコンバータを使用しない場合、システムとして電気二重層コンデンサ３２は、後段の蓄電池３４の充電電圧よりも高い電圧設定が必要となるため、２本直列にする必要がある。また、太陽電池３１に関しても、電気二重層コンデンサの電圧の直列電圧に合わせて７Ｖ系を採用する必要がある。その結果、本発明の実施例の場合の２倍の電圧の太陽電池が必要になり、太陽電池コストが２倍となった。
【００２６】
本発明は上記実施形態にのみ限定されることなく、本発明の範囲内で種々の変形が可能であり、それらも本発明の範囲内に含まれることはいうまでもない。たとえば、上記実施の形態で説明した電圧あるいは電流等の具体的数値等は、それらの好適なものを示すものであり、必要に応じて適宜変更等が可能である。
【００２７】
【発明の効果】
以上説明したように本発明によれば、この種の電源装置において外部電源からの入力電圧が充放電可能な蓄電池の充電に必要な電圧よりも低い場合でも充電可能とすることにより、充放電可能な外部電源の小型化および低コスト化を有効に実現することができる。
【図面の簡単な説明】
【図１】本発明の実施形態におけるシステム構成例を示す図である。
【図２】本発明の実施例におけるシステム構成例を示す図である。
【図３】太陽電池を外部電源とした従来例１の充放電可能な電源の比較例である。
【図４】太陽電池を外部電源とした従来例２の充放電可能な電源の比較例である。
【符号の説明】
１　　　発明による充放電可能な電源装置
２　　　外部電源
３　　　昇圧部
４　　　充放電可能な蓄電池
４Ａ　　ニッケル水素電池
５　　　負荷
６　　　第１の電気二重層コンデンサ
７　　　第２の電気二重層コンデンサ
８，９　　スイッチ
１０，１１，１４　　　電圧検出器
１２　　　演算回路
１３　　　スイッチ回路
２０　　　太陽電池[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a chargeable / dischargeable power supply device that stores power in a storage battery by an input voltage of an external power supply.
[0002]
[Prior art]
As this type of power supply device, there is known a power supply device configured by, for example, a power storage system combining an electric double layer capacitor and a chargeable / dischargeable storage battery.
[0003]
[Problems to be solved by the invention]
However, in the conventional power supply device, the chargeable voltage of the electric double layer capacitor is generally lower than the input voltage of the external power supply. Further, the chargeable voltage of the chargeable / dischargeable storage battery at the subsequent stage becomes low.
[0004]
In view of such circumstances, an object of the present invention is to provide a power supply device capable of charging even when an input voltage from an external power supply is lower than a voltage required for charging a rechargeable storage battery.
[0005]
[Means for Solving the Problems]
The chargeable / dischargeable power supply device of the present invention includes a booster circuit configured to be able to boost the voltage of the external power supply, and is capable of charging / discharging a voltage higher than the input voltage of the external power supply via the booster. It is characterized in that power can be stored in a simple storage battery.
[0006]
In the chargeable / dischargeable power supply device of the present invention, the boosting unit preferably includes a first electric double layer capacitor and a second electric double layer capacitor that can be connected in parallel to the external power supply, It is configured such that one of the electric double layer capacitors is always charged from an external power supply.
[0007]
In the chargeable / dischargeable power supply device of the present invention, the first electric double layer capacitor and the second electric double layer capacitor are preferably arranged in series with the storage battery, and the opposite side of the storage battery is Grounded.
[0008]
Further, in the chargeable / dischargeable power supply device of the present invention, by comparing the voltage of the first electric double layer capacitor with the voltage of the second electric double layer capacitor, It is preferable that the charge switching of the second electric double layer capacitor is performed.
[0009]
According to the present invention, by arranging two separately charged electric double layer capacitors in series with respect to a storage battery, power can be stored in a chargeable / dischargeable storage battery having a voltage higher than an input voltage of an external power supply. Can be.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of a chargeable / dischargeable power supply device according to the present invention will be described with reference to the drawings.
FIG. 1 shows an example of a system configuration according to an embodiment of the present invention. In the drawing, a chargeable / dischargeable power supply device 1 according to the present invention (a region surrounded by a dotted line in the drawing) includes a boosting unit 3 (a dashed-dotted line in the drawing) which is configured to be capable of boosting the voltage of an external power supply 2. ), So that a voltage higher than the input voltage of the external power supply 2 can be stored in the storage battery 4 (power storage unit) capable of charging and discharging via the booster 3. A load 5 is connected to the storage battery 4.
[0011]
The boosting unit 3 includes a first electric double layer capacitor 6 and a second electric double layer capacitor 7 which can be connected in parallel to the external power supply 2. Are connected to the external power supply 2 by the changeover switches 8 and 9.
With respect to the voltage Vc1 of the first electric double layer capacitor 6 and the voltage Vc2 of the second electric double layer capacitor 7, Vc1 + Vc2 is detected by the voltage detector 10, and the voltage of the electric double layer capacitor 6 is detected by the voltage detector 11. Is detected. The detected voltages are input to the arithmetic circuit 12 as 10A and 11A, respectively, are subjected to arithmetic processing, and the output 12A is output to the switch circuit 13. Further, a command from the switch circuit 13 is driven and controlled by signals 13A and 13B so that the changeover switches 8 and 9 are controlled to be switched.
[0012]
Here, the first electric double layer capacitor 6 and the second electric double layer capacitor 7 are arranged in series with the storage battery 4, and the opposite side of the storage battery 4 is grounded.
[0013]
As described later, by comparing the voltage Vc1 of the first electric double layer capacitor 6 with the voltage Vc2 of the second electric double layer capacitor 7, the first electric double layer capacitor 6 and the second electric double layer capacitor 6 are compared. Switching of charging of the capacitor 7 is performed.
[0014]
Next, the circuit of the booster will be described.
In FIG. 1, when the switch 8 is on the contact 8A side and the switch 9 is on the contact 9A, the current from the external power supply 2 charges the electric double layer capacitor 6. When the switch 8 is on the contact 8B side and the switch 9 is on the contact 9B side, the current from the external power supply 2 charges the electric double layer capacitor 7.
Here, switching between the first electric double layer capacitor 6 and the second electric double layer capacitor 7 is performed by changing the voltage Vc1 of the first electric double layer capacitor 6 and the voltage Vc2 of the second electric double layer capacitor 7. This is done by comparing 1, the voltage detector 10 can detect the voltage of Vc1 + Vc2, and the voltage detector 11 can detect the voltage of Vc2. Therefore, the voltage of Vc1 can also be known.
The voltage of the storage battery 4 is detected by a voltage detector 14, and its output 14 </ b> A is applied to an arithmetic circuit 12 to control a switch circuit 13.
[0015]
The required voltage of the external power supply 2 is such that the electric double layer capacitors are charged one by one while switching the two electric double layer capacitors 6 and 7, so that there is a voltage (Vc) that can charge one electric double layer capacitor. good. If the capacity of the two electric double-layer capacitors 6 and 7 and the voltage rating are the same, when fully charged, 2 Vc of the voltage obtained by connecting these electric double-layer capacitors in series can be applied to the storage battery 4.
The chargeable / dischargeable power supply device of the present invention includes the electric double layer capacitors 6 and 7 configured as described above and can be charged from the external power supply 2. A high voltage can be charged to the chargeable / dischargeable storage battery 4.
[0016]
【Example】
Here, a specific embodiment of the present invention will be described.
FIG. 2 shows an embodiment of the present invention. In the figure, an external power supply 1 is a chargeable / dischargeable power supply apparatus 1 according to the present invention using a solar cell 20. As shown in FIG. 2, when the electric double layer capacitors 6 and 7 are charged, the electric double layer capacitors 6 and 7 are individually connected to the solar cell 20 by the switches 8 and 9, and the electric double layer capacitors 6 and 7 are charged alternately. When discharging from the electric double layer capacitors 6 and 7, discharging is performed in two series, and electricity is transferred to the subsequent nickel-metal hydride battery 4A (chargeable and dischargeable storage battery).
[0017]
As the solar cell 20, 3.5V-100mA was used. As the electric double layer capacitors 6 and 7, two 2.3V-5F batteries and a nickel hydrogen battery 4A having a rated voltage of 1.2V-700mAh in a series connection of 2.4V-700mAh were used.
[0018]
As a standard of the solar cell 20, a voltage of 3.5 V or more that can charge the electric double layer capacitors 6 and 7 even in cloudy or rainy weather is preferable. The rated voltage of the current organic electrolytic solution type electric double layer capacitor is 2.3 V to 2.7 V per unit cell. Considering the cost, it is sufficient that the standard of the solar cell 20 is 3.5 to 4 V. In addition, the rated voltage of an aqueous double-layer capacitor is 0.8 V to 1.1 V per unit cell, and the voltage is adjusted by using a single unit or connected in series. I do. Further, the current value is appropriately determined, for example, according to the capacity stored in one day.
[0019]
The specifications of the electric double layer capacitors 6 and 7 need to be equal to or higher than the charge end voltage of the storage battery so that the nickel hydride battery 4A, which is a storage battery disposed at the subsequent stage, can be charged when two series are connected. . When a rating of 2.4 V to 700 mAh (two series) is used as the nickel-metal hydride battery 4A, the final voltage is around 3.0 V at room temperature. It is preferable that the detection for the actual completion of charging is performed in combination with some conventionally used methods.
If a rated voltage of 2.3 V is used for the electric double layer capacitors 6 and 7, when two batteries are fully charged in series, the voltage becomes 4.6 V, which is a voltage that can sufficiently charge the subsequent nickel-metal hydride battery. The voltage at which the electric double layer capacitors 6 and 7 are charged by the solar cell 20 does not need to be 2.3 V which is a full charge for one electric double layer capacitor. In the present invention, it is sufficient that the voltage is higher than the charge end voltage (near 3.0 V at room temperature) of the subsequent nickel hydride battery 4A in two series of the electric double layer capacitors 6 and 7.
[0020]
In other words, if 1.5 V or more is charged per one of the electric double layer capacitors 6 and 7, the voltage exceeds 3.0 V in two series, so that the nickel hydride battery 4A at the subsequent stage can be charged. Regarding the charging voltage of the electric double layer capacitors 6 and 7, the higher the voltage, the easier it is to charge the storage battery 4A at the subsequent stage.
[0021]
Here, a comparative example for the present invention will be further described.
(Comparative Example 1)
FIG. 3 is a comparative example of a chargeable / dischargeable power supply of Conventional Example 1 using a solar cell as an external power supply. The chargeable / dischargeable power supply 30 of the conventional example 1 is configured such that an electric double layer capacitor 32 charged from a solar cell 31 as an external power supply is connected to a chargeable / dischargeable storage battery 34 via a DC / DC converter 33 for adjusting a voltage. It is connected.
The charge and discharge voltages of the electric double layer capacitor 32 and the storage battery 34 are monitored by voltage detectors 35 and 36, respectively. Although not shown, the outputs of these voltage detectors 35 and 36 are input to a control circuit and drive the switch 37 to turn on when the electric double layer capacitor 32 is fully charged. The storage battery 34 is connected to a load (not shown).
[0022]
Here, the solar cell 31 is 3.5V-100mA, the electric double layer capacitor 32 is 2.3V-5F, and the chargeable / dischargeable storage battery 34 is 2.4V (1.2V in two series) -700mAh nickel-metal hydride. Take the case where batteries are arranged as an example. In this example, a DC / DC converter 33 is required between the electric double-layer capacitor 32 and the nickel-metal hydride battery 34. In this case, the DC / DC converter 33 has a voltage of about A 30% loss has occurred.
[0023]
(Comparative Example 2)
FIG. 4 is a comparative example of a chargeable / dischargeable power supply of Conventional Example 2 using a solar cell as an external power supply. The chargeable / dischargeable power supply 40 of the second conventional example is configured by connecting two solar cells 31 and two electric double-layer capacitors 32 in series without using the DC / DC converter 33 in the configuration of the comparative example of FIG. I have. Other components are the same as those in FIG. 3 and will not be described.
[0024]
As the solar cell 31, two 3.5V-100mA batteries were connected in series, and had a capacity of 7V-100mAh. Two electric double layer capacitors 32 of 2.3V-5F were connected in series to have a capacity of 4.6V-2.5F. The nickel-metal hydride battery 34 had a capacity of 2.4 V (1.2 V in two series) -700 mAh.
[0025]
When a DC / DC converter is not used as in this example, the electric double-layer capacitor 32 needs to be set in series as the system requires a voltage setting higher than the charging voltage of the storage battery 34 in the subsequent stage. Further, as for the solar cell 31, it is necessary to adopt a 7V system in accordance with the series voltage of the voltage of the electric double layer capacitor. As a result, a solar cell having a voltage twice as high as that of the embodiment of the present invention was required, and the cost of the solar cell was doubled.
[0026]
The present invention is not limited to the above embodiment, and various modifications are possible within the scope of the present invention, and it goes without saying that they are also included in the scope of the present invention. For example, specific numerical values such as voltage or current described in the above-described embodiment indicate preferable ones, and can be appropriately changed as necessary.
[0027]
【The invention's effect】
As described above, according to the present invention, charging and discharging can be performed by enabling charging even when an input voltage from an external power supply is lower than a voltage required for charging a rechargeable storage battery in this type of power supply device. It is possible to effectively reduce the size and cost of the external power supply.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an example of a system configuration according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating an example of a system configuration according to an embodiment of the present invention.
FIG. 3 is a comparative example of a chargeable / dischargeable power supply of Conventional Example 1 using a solar cell as an external power supply.
FIG. 4 is a comparative example of a chargeable / dischargeable power supply of Conventional Example 2 using a solar cell as an external power supply.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 chargeable / dischargeable power supply device 2 external power supply 3 booster 4 chargeable / dischargeable storage battery 4A nickel-metal hydride battery 5 load 6 first electric double layer capacitor 7 second electric double layer capacitor 8, 9 Switches 10, 11 , 14 Voltage detector 12 Operation circuit 13 Switch circuit 20 Solar cell

Claims (4)

外部電源の電圧を昇圧可能となるように回路構成された昇圧部を備え、該昇圧部を介して前記外部電源の入力電圧よりも高い電圧の充放電可能な蓄電池に対して蓄電できるようにしたことを特徴とする、充放電可能な電源装置。A booster circuit configured so as to be able to boost the voltage of the external power supply, and charging / discharging of a chargeable / dischargeable storage battery having a higher voltage than the input voltage of the external power supply is provided via the booster; A chargeable / dischargeable power supply device. 前記昇圧部として、前記外部電源に対して並列に接続し得る第１の電気二重層コンデンサと第２の電気二重層コンデンサとを含み、前記外部電源から常にいずれか一方の電気二重層コンデンサに充電していることを特徴とする、請求項１に記載の充放電可能な電源装置。The booster includes a first electric double layer capacitor and a second electric double layer capacitor that can be connected in parallel to the external power supply, and always charges one of the electric double layer capacitors from the external power supply. The chargeable / dischargeable power supply device according to claim 1, wherein: 前記第１の電気二重層コンデンサと第２の電気二重層コンデンサは、前記蓄電池に対して直列に配置され、かつ前記蓄電池の反対側はアース接続されていることを特徴とする、請求項２に記載の充放電可能な電源装置。The method according to claim 2, wherein the first electric double layer capacitor and the second electric double layer capacitor are arranged in series with the storage battery, and the other side of the storage battery is grounded. A chargeable / dischargeable power supply device as described in the above. 前記第１の電気二重層コンデンサの電圧と前記第２の電気二重層コンデンサの電圧を比較することにより、前記第１の電気二重層コンデンサおよび前記第２の電気二重層コンデンサの充電切替えが行なわれることを特徴とする、請求項２又は３に記載の充放電可能な電源装置。By comparing the voltage of the first electric double-layer capacitor with the voltage of the second electric double-layer capacitor, the charge switching of the first electric double-layer capacitor and the second electric double-layer capacitor is performed. The chargeable / dischargeable power supply device according to claim 2 or 3, wherein:
JP2002239710A 2002-08-20 2002-08-20 Chargeable power supply apparatus Pending JP2004080942A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007104801A (en) * 2005-10-04 2007-04-19 Toshiba Tec Corp Charging set and vacuum cleaner
JP2007104802A (en) * 2005-10-04 2007-04-19 Toshiba Tec Corp Charging set and vacuum cleaner
EP2090140A2 (en) * 2006-10-21 2009-08-19 Advanced Analogic Technologies, Inc. Charging scheme
WO2013080616A1 (en) * 2011-11-28 2013-06-06 オムロン株式会社 Voltage conversion circuit and electronic apparatus
US8841891B2 (en) 2007-08-08 2014-09-23 Advanced Analogic Technologies Incorporated Time-multiplexed-capacitor DC/DC converter with multiple outputs
JP2021052450A (en) * 2019-09-20 2021-04-01 トヨタ自動車株式会社 Charger

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007104802A (en) * 2005-10-04 2007-04-19 Toshiba Tec Corp Charging set and vacuum cleaner
JP2007104801A (en) * 2005-10-04 2007-04-19 Toshiba Tec Corp Charging set and vacuum cleaner
EP2090140B1 (en) * 2006-10-21 2014-08-13 Advanced Analogic Technologies, Inc. Charging scheme
EP2090140A2 (en) * 2006-10-21 2009-08-19 Advanced Analogic Technologies, Inc. Charging scheme
JP2010508004A (en) * 2006-10-21 2010-03-11 アドバンスト・アナロジック・テクノロジーズ・インコーポレイテッド Charging method
US9071055B2 (en) 2006-10-21 2015-06-30 Advanced Analogic Technologies Incorporated Charging scheme
US8493036B2 (en) 2006-10-21 2013-07-23 Advanced Analogic Technologies, Inc. Controllable charge paths, and related methods
JP2014007955A (en) * 2006-10-21 2014-01-16 Advanced Analogic Technologies Inc Charging scheme
KR101395948B1 (en) 2006-10-21 2014-05-16 어드밴스드 아날로직 테크놀로지스 인코퍼레이티드 Charging scheme
TWI499185B (en) * 2007-08-08 2015-09-01 Advanced Analogic Tech Inc Multiple output charge pump and method for operating the same
US8841891B2 (en) 2007-08-08 2014-09-23 Advanced Analogic Technologies Incorporated Time-multiplexed-capacitor DC/DC converter with multiple outputs
US9225239B2 (en) 2007-08-08 2015-12-29 Advanced Analogic Technologies, Incorporated Multiple output charge pump with multiple flying capacitors
JP2013115913A (en) * 2011-11-28 2013-06-10 Omron Corp Voltage conversion circuit and electronic apparatus
WO2013080616A1 (en) * 2011-11-28 2013-06-06 オムロン株式会社 Voltage conversion circuit and electronic apparatus
US9507370B2 (en) 2011-11-28 2016-11-29 Omron Corporation Voltage conversion circuit with improved conversion efficiency
JP2021052450A (en) * 2019-09-20 2021-04-01 トヨタ自動車株式会社 Charger
JP7136056B2 (en) 2019-09-20 2022-09-13 トヨタ自動車株式会社 charging device

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