JPH01214236A - Battery charging control circuit - Google Patents

Battery charging control circuit

Info

Publication number
JPH01214236A
JPH01214236A JP63038841A JP3884188A JPH01214236A JP H01214236 A JPH01214236 A JP H01214236A JP 63038841 A JP63038841 A JP 63038841A JP 3884188 A JP3884188 A JP 3884188A JP H01214236 A JPH01214236 A JP H01214236A
Authority
JP
Japan
Prior art keywords
battery
voltage
circuit
shunt circuit
battery voltage
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.)
Pending
Application number
JP63038841A
Other languages
Japanese (ja)
Inventor
Katsuaki Matsui
松井　捷明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP63038841A priority Critical patent/JPH01214236A/en
Publication of JPH01214236A publication Critical patent/JPH01214236A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Abstract

PURPOSE:To simplify the circuit constitution of an apparatus and to reduce the power loss thereof, by controlling the power consumption of a shunt circuit through an error detector for detecting the error of a battery voltage detected by a battery voltage detector and a bus voltage. CONSTITUTION:When a battery voltage VBAT reaches a certain prescribed voltage, a battery voltage detector 6 operates to control a shunt circuit 3 via an error detector 4 according to the rise of said battery voltage and to increase the consumed power of said shunt circuit 3 to lower a bus voltage VBUS. Also, when a load power increases during a charge, the battery voltage VBAT lowers because a charging current decreases, and said shunt circuit 3 is controlled to diminish a consumed current. On the other hand, when the load power decreases, the shunt circuit 3 is controlled to increase said consumed current, because the charging current flowing to a battery 5 increases and the battery voltage goes up with the rise of said bus voltage VBUS.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は小電力人工衛星搭載用バッテリ充電制御方式に
関し、特にバッテリの過充電を防止するバッテリ充電制
御回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a battery charging control system for use in a small power artificial satellite, and more particularly to a battery charging control circuit that prevents overcharging of a battery.

〔従来の技術〕[Conventional technology]

従来の人工衛星で使用されているバッテリ充電回路は、
第２図に示すように、太陽電池１に接続されたバス電圧
ライン２にシャント回路３を接続し、これを誤差検出器
４によって制御するように構成するとともに、バス電圧
ライン２とバッテリ５間にバッテリ充電回路１１を設け
、これをバッテリ電圧検出器６によって制御するように
構成している。なお、９は放電用ダイオード、１０は負
荷である。The battery charging circuit used in conventional satellites is
As shown in FIG. 2, a shunt circuit 3 is connected to a bus voltage line 2 connected to a solar cell 1, and is configured to be controlled by an error detector 4. A battery charging circuit 11 is provided in the battery charging circuit 11, and the battery charging circuit 11 is configured to be controlled by a battery voltage detector 6. Note that 9 is a discharge diode and 10 is a load.

この回路では、バッテリ５の電圧をバッテリ電圧検出器
６によって検出することによりバッテリ充電回路１１を
制御してバッテリ充電電流を制御Ｈし、バッテリへの過
充電を防止している。また、同時に充電電流によりシャ
ント回路３での電流消費を制御して、充電電流の制御を
行なっている。In this circuit, the voltage of the battery 5 is detected by the battery voltage detector 6 to control the battery charging circuit 11 to control the battery charging current to prevent overcharging of the battery. At the same time, the charging current is controlled by controlling the current consumption in the shunt circuit 3 using the charging current.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来のバッテリ充電制御回路は、バッテリへの
充電初期においては定電流制御を行ない、バッテリがあ
る電圧に達した時点で定電圧充電に切換えバッテリ電圧
が上昇するとともに充電電流を減少させている。または
、定電流制御のまま低電流に切換える方式をとっている
。更に、充電電流が減少すると同時に、その減少した電
流をシャント回路に消費させ、バス電圧上昇を防ぐよう
制御している。The conventional battery charging control circuit described above performs constant current control during the initial stage of charging the battery, and when the battery reaches a certain voltage, switches to constant voltage charging and decreases the charging current as the battery voltage increases. . Alternatively, a method is adopted in which the current is switched to a low current while maintaining constant current control. Further, when the charging current decreases, the shunt circuit consumes the decreased current, thereby controlling to prevent the bus voltage from increasing.

したがって、従来回路では、バッテリ充電回路とシャン
ト回路の両方を制御する必要があり、小電力の小型衛星
でも回路構成が複雑となり小型。Therefore, with conventional circuits, it is necessary to control both the battery charging circuit and the shunt circuit, making the circuit configuration complex and compact even for small satellites with low power.

軽量化が困難になる。また、バッテリ充電回路における
電力ロスが増加する等の問題が生じている。It becomes difficult to reduce weight. Further, problems such as increased power loss in the battery charging circuit have arisen.

本発明は回路構成を簡略化し、かつ電力ロスを低減した
バッテリ充電制御回路を提供することを目的としている
。An object of the present invention is to provide a battery charging control circuit with a simplified circuit configuration and reduced power loss.

〔課題を解決するための手段〕[Means to solve the problem]

本発明のバッテリ充電制御回路は、太陽電池の電力を消
費するシャント回路を、太陽電池、バッテリ及び負荷を
接続したバス電圧ラインに接続するとともに、バッテリ
電圧検出器で検出されたバッテリ電圧と前記バス電圧と
の誤差を検出する誤差検出器により前記シャント回路の
電力消費を制御し得るように構成している。The battery charging control circuit of the present invention connects a shunt circuit that consumes power from a solar cell to a bus voltage line connected to a solar cell, a battery, and a load, and connects a battery voltage detected by a battery voltage detector to the bus voltage line. The configuration is such that the power consumption of the shunt circuit can be controlled by an error detector that detects an error with the voltage.

〔作用〕[Effect]

上述した構成では、バッテリ電圧によりシャント回路を
制’＋ｆｌｌＬで太陽電池の電力を消費させ、バス電圧
を低下させてバッテリ充電電流を減少させ、電力ロスを
減少してバッテリへの過充電を防止する。In the above-described configuration, the shunt circuit is controlled by the battery voltage to consume the power of the solar cell, and the bus voltage is lowered to reduce the battery charging current, thereby reducing power loss and preventing overcharging of the battery. .

〔実施例〕〔Example〕

次に、本発明を図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.

第１図は本発明によるバッテリ充電制御回路の一実施例
である。FIG. 1 shows an embodiment of a battery charging control circuit according to the present invention.

第１図において、１は太陽電池であり、バス電圧ライン
２に接続された負荷１０及びバッテリ５にバス電圧ｖａ
ｎｓを出力する。３は余剰電力を消費するシャント回路
であり、誤差検出増幅器４によってその消費量が制御さ
れる。この誤差検出増幅器４は、前記バス電圧■。、及
びパンテリ電圧検出器６により検出されたバッテリ５の
バッテリ電圧Ｖ　ＢＡＴに基づいて動作される。また、
前記バス電圧ライン２とバッテリ５との間には、抵抗値
Ｒの電流制御用抵抗７．充電用ダイオード８及び放電用
ダイオード９が接続される。In FIG. 1, 1 is a solar cell, and a bus voltage va is applied to a load 10 and a battery 5 connected to a bus voltage line 2.
Outputs ns. 3 is a shunt circuit that consumes surplus power, and the amount of consumption thereof is controlled by the error detection amplifier 4. This error detection amplifier 4 receives the bus voltage ■. , and the battery voltage V BAT of the battery 5 detected by the battery voltage detector 6 . Also,
A current control resistor 7 with a resistance value R is provided between the bus voltage line 2 and the battery 5. A charging diode 8 and a discharging diode 9 are connected.

次に本実施例の充電制御回路の動作を説明する。Next, the operation of the charging control circuit of this embodiment will be explained.

充電初期は、太陽電池１０発生電力と負荷１゜で消費さ
れる電力との差の電圧によりバッテリ５が充電される。At the initial stage of charging, the battery 5 is charged with the voltage difference between the power generated by the solar cell 10 and the power consumed by the load 1°.

この時の充電電流は、約、（■。ｇ　　ＶＩＡＴ）÷Ｒ
・・・・・・（１）となる。但し発生電力が非常に大き
い場合は誤差検出器４でシャント回路３を制御して余剰
電力をシャント回路３で消費させ、バス電圧■。３を一
定に制御する。The charging current at this time is approximately (■.g VIAT)÷R
......(1). However, if the generated power is very large, the error detector 4 controls the shunt circuit 3 to cause the shunt circuit 3 to consume the excess power, reducing the bus voltage ■. 3 is controlled constant.

（１）式で示した電流で長時間充電した場合、バッテリ
５は過充電状態となるため、バッテリ電圧Ｖ□テがある
規定された電圧に達するとバッテリ電圧検出器６が動作
し、誤差検出器４を通してバッテリ電圧上昇に合わせて
シャント回路３を制御し、シャント回路３の消費電力を
増加させてバス電圧ｖ　ｍｕｓを低下させる。この制御
によりバス電圧ｖ　ｍｕｓとバッテリ電圧■□１との差
が小さ（なり、バッテリ５への充電電流は減少してい（
。If the battery 5 is charged for a long time with the current shown in equation (1), it will be in an overcharged state, so when the battery voltage V□te reaches a certain specified voltage, the battery voltage detector 6 will operate and detect an error. The shunt circuit 3 is controlled through the device 4 in accordance with the rise in battery voltage, and the power consumption of the shunt circuit 3 is increased to lower the bus voltage v mus. Due to this control, the difference between the bus voltage v mus and the battery voltage ■□1 becomes small (becomes), and the charging current to the battery 5 decreases (
.

又、充電中において負荷電力が増加した場合は、充電電
流が減少するためにバッテリ電圧■、ＡＴは低下し、シ
ャン）回路３は消費電流が少なくな゛るよう制御される
。逆に負荷電力が減少した場合は、バス電圧Ｖ　ＩＬ１
３の上昇に伴うてバッテリ５への充電電流が増加しかつ
バッテリ電圧が上昇するため、シャント回路３は消費電
流が増加するよう制御され、結果的にバッテリへの充電
電流が減少するよう制御される。Furthermore, if the load power increases during charging, the charging current decreases, so the battery voltage (1), AT decreases, and the shunt circuit 3 is controlled so that the current consumption decreases. Conversely, if the load power decreases, the bus voltage VIL1
3, the charging current to the battery 5 increases and the battery voltage increases, so the shunt circuit 3 is controlled to increase the current consumption, and as a result, the shunt circuit 3 is controlled to decrease the charging current to the battery. Ru.

したがって、シャント回路３の制御のみでバッテリ５の
充電電流を好適に制御し、その過充電の防止が実現され
る。Therefore, the charging current of the battery 5 can be suitably controlled only by controlling the shunt circuit 3, and overcharging can be prevented.

（発明の効果〕 以上説明したように本発明は、バッテリ電圧がある電圧
以上となったときにシャント回路を制御して太陽電池の
電力を消費させ、バス電圧を低下させてバッテリ充電電
流を減少させているので、バッテリ充電回路を省略して
回路構成を簡略化し、小型、軽量化を図ることができる
。また、従来のバッテリ充電回路が省略できるので、こ
のバッテリ充電回路における電力ロスも減少させること
が出来る効果がある。(Effects of the Invention) As explained above, the present invention controls the shunt circuit to consume the power of the solar cell when the battery voltage exceeds a certain voltage, lowering the bus voltage and reducing the battery charging current. Since the battery charging circuit can be omitted, the circuit configuration can be simplified, making it smaller and lighter in weight.Also, since the conventional battery charging circuit can be omitted, power loss in the battery charging circuit can also be reduced. There is an effect that can be done.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例の充電制御回路のブロック回
路図、第２図は従来の充電制御回路のブロック回路図で
ある。 １・・・太陽電池、２・・・バス電圧ライン、３・・・
シャント回路、４・・・誤差検出器、５・・・バッテリ
、６・・・バッテリ電圧検出器、７・・・電流制御用抵
抗、８・・・充電用ダイオード、９・・・放電用ダイオ
ード、１０・・・負荷、１１・・・バッテリ充電回路。FIG. 1 is a block circuit diagram of a charging control circuit according to an embodiment of the present invention, and FIG. 2 is a block circuit diagram of a conventional charging control circuit. 1... Solar cell, 2... Bus voltage line, 3...
Shunt circuit, 4... Error detector, 5... Battery, 6... Battery voltage detector, 7... Current control resistor, 8... Charging diode, 9... Discharging diode , 10...Load, 11...Battery charging circuit.

Claims (1)

【特許請求の範囲】[Claims] １、太陽電池の電力を消費するシャント回路を、太陽電
池、バッテリ及び負荷を接続したバス電圧ラインに接続
するとともに、バッテリ電圧検出器で検出されたバッテ
リ電圧と前記バス電圧との誤差を検出する誤差検出器に
より前記シャント回路の電力消費を制御し得るように構
成したことを特徴とするバッテリ充電制御回路。1. Connect the shunt circuit that consumes the power of the solar cell to the bus voltage line connecting the solar cell, battery, and load, and detect the error between the battery voltage detected by the battery voltage detector and the bus voltage. A battery charging control circuit characterized in that the battery charging control circuit is configured to be able to control power consumption of the shunt circuit using an error detector.
JP63038841A 1988-02-22 1988-02-22 Battery charging control circuit Pending JPH01214236A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63038841A JPH01214236A (en) 1988-02-22 1988-02-22 Battery charging control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63038841A JPH01214236A (en) 1988-02-22 1988-02-22 Battery charging control circuit

Publications (1)

Publication Number Publication Date
JPH01214236A true JPH01214236A (en) 1989-08-28

Family

ID=12536427

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63038841A Pending JPH01214236A (en) 1988-02-22 1988-02-22 Battery charging control circuit

Country Status (1)

Country Link
JP (1) JPH01214236A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009060996A1 (en) * 2007-11-09 2009-05-14 Nec Toshiba Space Systems, Ltd. Power supply controller
JP2019176687A (en) * 2018-03-29 2019-10-10 国立研究開発法人宇宙航空研究開発機構 Power control system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009060996A1 (en) * 2007-11-09 2009-05-14 Nec Toshiba Space Systems, Ltd. Power supply controller
US8456035B2 (en) 2007-11-09 2013-06-04 Nec Toshiba Space Systems, Ltd. Power supply controller
JP2019176687A (en) * 2018-03-29 2019-10-10 国立研究開発法人宇宙航空研究開発機構 Power control system

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