JPH08168192A - Charging controller - Google Patents

Charging controller

Info

Publication number
JPH08168192A
JPH08168192A JP31032494A JP31032494A JPH08168192A JP H08168192 A JPH08168192 A JP H08168192A JP 31032494 A JP31032494 A JP 31032494A JP 31032494 A JP31032494 A JP 31032494A JP H08168192 A JPH08168192 A JP H08168192A
Authority
JP
Japan
Prior art keywords
charging
battery
voltage
secondary battery
current
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
JP31032494A
Other languages
Japanese (ja)
Inventor
Mitsuo Saeki
充雄 佐伯
Tadashi Okumura
匡史 奥村
Nobuo Tanaka
信夫 田中
Hidekiyo Ozawa
秀清 小澤
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP31032494A priority Critical patent/JPH08168192A/en
Publication of JPH08168192A publication Critical patent/JPH08168192A/en
Pending legal-status Critical Current

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

Abstract

PURPOSE: To prevent the residual power of a secondary battery built in an electronic apparatus from dropping below a predetermined level by starting the charging operation when the electronic apparatus is fed with power externally and a decision is made that the residual power of the secondary battery is lower than the predetermined level. CONSTITUTION: A charging control section (microcontroller) 23 controls a constant current/constant voltage control circuit 21 to designate the start/stop of charging operation (ON/OFF signal) and the current value. A voltage/current measuring circuit 22 measures the voltage and current when a battery 3 is charged or discharged and delivers the measurements to the charge control section 23. The constant current/constant voltage control circuit 21 feeds the battery 3 with a constant current at first and then feed the battery 3 with a constant voltage. Upon finishing the charging operation, the battery voltage is monitored and when the battery reaches a predetermined limit level or when the elapsed time reaches a predetermined limit time, a charging operation starting command ON is delivered.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、リチウム・イオン電池
(以下 Li+電池と記す) 等の、ニッケルカドミウム電池
やニッケル水素電池(以下 Nicd/NiMH 電池と記す)に
対して用いられるトリクル充電方式では電池の劣化を招
くため不可であるような二次電池の充電制御装置に関す
る。
FIELD OF THE INVENTION The present invention relates to a lithium ion battery.
The trickle charging method used for nickel-cadmium batteries and nickel-hydrogen batteries (hereinafter referred to as Nicd / NiMH batteries), such as (hereinafter referred to as Li + batteries), is not suitable for secondary batteries that may cause deterioration of the battery. The present invention relates to a charge control device.

【0002】携帯型電子機器においては、内蔵する二次
電池は、電池動作を開始するときには常に満充電状態で
あることが望ましい。
In a portable electronic device, it is desirable that the built-in secondary battery is always in a fully charged state when the battery operation is started.

【0003】[0003]

【従来の技術】携帯型電子機器においては、装置の電源
として、内蔵する二次電池と内蔵または外付けのACア
ダプタのどちらでも使える2電源方式とすることが多
い。また、その場合、ACアダプタを接続するだけで簡
単に装置内蔵の二次電池に対して充電ができるように、
充電制御装置も内蔵している例が多い。
2. Description of the Related Art In portable electronic equipment, the power source of the device is often a dual power source system in which either a built-in secondary battery or an internal or external AC adapter can be used. Also, in that case, you can easily charge the secondary battery built in the device simply by connecting the AC adapter.
In many cases, it also has a built-in charging control device.

【0004】装置に内蔵する二次電池には、運用コスト
や瞬間的に放電可能な電流容量等の関係で、ニッケルカ
ドミュウム電池、ニッケル水素電池およびリチウム・イ
オン二次電池(以下Nicd / NiMH /Li+ と記す) が一般
的に使用される。
The secondary battery built in the device is a nickel-cadmium battery, a nickel-hydrogen battery, or a lithium-ion secondary battery (hereinafter referred to as Nicd / NiMH) in view of the operating cost and the instantaneous dischargeable current capacity. / Li +) is commonly used.

【0005】携帯型機器であるため、装置の電源として
通常は内蔵の二次電池を使用するが、机上での長時間運
用等のように、ACアダプタ等の外部電源より電力の供
給を受けて動作させる場合もある。
Since it is a portable device, a built-in secondary battery is usually used as a power source for the device, but it receives power from an external power source such as an AC adapter for long-time operation on a desk. It may be operated.

【0006】図3は代表的な二次電池の通常の充電方式
によるときの充電電圧と充電電流の時間変化を示す。
(1)は Nicd/NiMH電池の場合であり、(2)はLi+
二次電池の場合である。
FIG. 3 shows changes with time in charging voltage and charging current when a typical secondary battery is charged by a normal charging method.
(1) is for Nicd / NiMH batteries, (2) is for Li +
This is the case of a secondary battery.

【0007】Nicd/NiMH電池では、充電制御装置はある
程度高い電圧で、定電流制御を行うことにより充電す
る。図に示すように、充電電流は一定であり、充電が進
むにつれて充電電圧は高くなる。満充電状態になると、
電池の特性上わずかに電圧が下がる(−ΔV)。通常こ
れを検出して充電終了とする。
In the Nicd / NiMH battery, the charging control device charges the battery at a high voltage to some extent by performing constant current control. As shown in the figure, the charging current is constant, and the charging voltage increases as the charging progresses. When fully charged,
Due to the characteristics of the battery, the voltage drops slightly (-ΔV). Normally, this is detected to end charging.

【0008】Li+ 二次電池では、電池の特性上、満充電
時の電圧より高い電圧を加えることはできない。従っ
て、始めは定電流により充電するが、ある程度充電電圧
が上がると電圧を押さえ定電圧制御を行う。定電圧とい
っても実際はわずかに電圧は上昇する。この電圧が電池
の許容値を越えないように、充電電流が所定値以下にな
ったところで充電終了とする。電池の容量が1AHのと
き1Aの電流を1Cの電流と呼ぶ。通常は0.1Cの電
流値で終了とする。
Due to the characteristics of the Li + secondary battery, it is not possible to apply a voltage higher than the voltage at full charge. Therefore, at first, the battery is charged with a constant current, but when the charging voltage rises to some extent, the voltage is suppressed and constant voltage control is performed. Even though it is a constant voltage, the voltage actually rises slightly. To prevent this voltage from exceeding the allowable value of the battery, the charging is terminated when the charging current falls below a predetermined value. When the capacity of the battery is 1 AH, the current of 1 A is called the current of 1 C. Normally, the current value is 0.1 C to finish the process.

【0009】充電電流は通常0.3C程度にするが、こ
の標準充電の他に、急速充電と称する充電電流値を大
(1C〜1.5C)にして充電時間を短くする方式があ
るが本質的な違いはない。
The charging current is usually set to about 0.3 C, but in addition to this standard charging, there is a system called rapid charging in which the charging current value is large (1 C to 1.5 C) to shorten the charging time. There is no difference.

【0010】なお、充電の終了検出には、前記の−ΔV
の検出、充電電流値の検出の他に、ピーク電圧の検出、
絶対温度が規定値を越えたことの検出、ΔT/Δt が規定
値以上になったことの検出、あるいは規定の充電時間が
経過したことの検出等、各種の手法があり、適宜、単独
でまたは組み合わせて用いられる。
For detecting the end of charging, the above-ΔV
Detection of peak voltage,
There are various methods such as detecting that the absolute temperature exceeds the specified value, detecting that ΔT / Δt has exceeded the specified value, or detecting that the specified charging time has elapsed. Used in combination.

【0011】このような2電源方式の電子機器をACア
ダプタ等で運用している場合、機器の電力はACアダプ
タから供給され、二次電池から供給されることはないた
め、論理的には二次電池の電力は消費されないはずであ
る。しかし、二次電池は充電後放置した場合、負荷を取
ることがなくても電池内部の漏電により自然に電池が放
電してしまう。この現象を自己放電という。自己放電量
は電池の種類や環境温度等により異なるが、Nicd/NiMH
電池では30%/月程度のレートで自然放電するため、
100%の充電状態で放置しても2〜3ケ月後にはほと
んど電力が残っていない。従って、機器を2〜3ケ以上
の長期にわたってACアダプタ等で運用している場合、
再充電しないと電池での運用を行うことができなくなっ
てしまう。
When such a dual power supply type electronic device is operated by an AC adapter or the like, the power of the device is supplied from the AC adapter and is not supplied from the secondary battery. The power of the secondary battery should not be consumed. However, when the secondary battery is left after being charged, the battery naturally discharges due to electric leakage inside the battery without taking a load. This phenomenon is called self-discharge. The amount of self-discharge depends on the type of battery, ambient temperature, etc., but Nicd / NiMH
Since the battery discharges naturally at a rate of about 30% / month,
Even if left in a 100% charged state, almost no power remains after a few months. Therefore, when operating the equipment with an AC adapter or the like for a long time of 2-3 or more,
If it is not recharged, it will not be possible to operate on batteries.

【0012】従って、二次電池が Nicd/NiMH 電池の場
合は、通常の充電の終了後は自己放電による自己消費量
に見合う微小電流をACアダプタ等から供給して低率の
充電レートで常に充電し、自己放電による目減りを防止
する。これをトリクル充電という。
Therefore, when the secondary battery is a Nicd / NiMH battery, a small current corresponding to the self-consumption amount due to self-discharge is supplied from the AC adapter or the like after normal charging to constantly charge at a low charging rate. However, it prevents the loss of electricity due to self-discharge. This is called trickle charging.

【0013】図4にトリクル充電回路を示す。トリクル
充電は、通常の充電制御装置2と並列に、直流電圧源
(ACアダプタ出力)1から電流制限用の抵抗R0と逆流
防止用のダイオードD4をとおして電池3に接続する回路
で実現される。ダイオードD4はACアダプタ1による電
力供給が途絶えたとき電池の電力がACアダプタ1を通
して漏洩するのを防止する。ACアダプタ1は一定の電
圧で電力を供給し、充電完了後の二次電池3の電圧も一
定である。従って、二次電池3は抵抗R0を介してACア
ダプタ1と二次電池3の電圧差と抵抗R0により決まる電
流で充電される。この充電電流値が二次電池の自己放電
に見合う電流値となるように抵抗R0の値を決めれば、つ
ねに二次電池の自己放電分をACアダプタ1から供給す
ることとなり、常に満充電状態を保つこととなる。
FIG. 4 shows a trickle charging circuit. Trickle charging is realized by a circuit that is connected in parallel with the normal charge control device 2 from the DC voltage source (AC adapter output) 1 to the battery 3 through the resistor R 0 for current limiting and the diode D 4 for backflow prevention. To be done. The diode D 4 prevents the power of the battery from leaking through the AC adapter 1 when the power supply from the AC adapter 1 is cut off. The AC adapter 1 supplies electric power at a constant voltage, and the voltage of the secondary battery 3 after the completion of charging is also constant. Therefore, the secondary battery 3 is charged with the current determined by the resistor R 0 and the voltage difference between the AC adapter 1 and the secondary battery 3 via a resistor R 0. If the value of the resistor R 0 is determined so that this charging current value becomes a current value commensurate with the self-discharge of the secondary battery, the self-discharged amount of the secondary battery will always be supplied from the AC adapter 1, and the fully charged state will Will be maintained.

【0014】前述したように、Nicd/NiMH電池では、あ
る程度高い電圧がかかっても問題ないため、自己放電を
補うためには、抵抗による電流制限を施した定電圧によ
る充電と言う簡単な方法で実現が可能である。一方、今
後の主流となると考えられるLi+ 二次電池では、電池で
決められた以上の電圧を印加すると電池が劣化するた
め、同様な方式によるトリクル充電を行うことはできな
い。ただし、 Li+二次電池はNiMH電池や Nicd電池に比
べて自己放電量が少ない。 Li+二次電池の自己放電量は
Nicd電池や NiMH 電池に比べて極端に少なく10%/
月程度であり、6ケ月程度放置してもまだ50%程度の
残量がある。従って、充電終了後はそのままにしてもよ
い。
As described above, the Nicd / NiMH battery does not have a problem even if a high voltage is applied to some extent. Therefore, in order to compensate for self-discharge, a simple method of charging by a constant voltage with current limitation by a resistor is used. Realization is possible. On the other hand, Li + secondary batteries, which are expected to become the mainstream in the future, cannot be trickle-charged by the same method because the battery deteriorates when a voltage higher than that determined by the battery is applied. However, the Li + secondary battery has less self-discharge than NiMH or Nicd batteries. The amount of self-discharge of Li + secondary battery
Extremely less than NiCD or NiMH batteries, 10% /
It is about a month, and even if left for about 6 months, there is still about 50% remaining. Therefore, it may be left as it is after the end of charging.

【0015】[0015]

【発明が解決しようとする課題】しかし、最悪の事態と
して、機器を長い間ACアダプタ等により外部からの電
力で動作させた後、内蔵二次電池で動作させようとした
とき、不可能になっていることがあり得る。
However, in the worst case, when the equipment is operated for a long time by external power from the AC adapter or the like and then it is operated by the built-in secondary battery, it becomes impossible. Can be.

【0016】そこで、本発明は、外部からの電力による
動作時であっても、内蔵二次電池の電力の残量が所定値
以下にならないようにすることを目的としている。
Therefore, an object of the present invention is to prevent the remaining amount of electric power of the built-in secondary battery from falling below a predetermined value even when operating with external electric power.

【0017】[0017]

【課題を解決するための手段】二次電池と外部から電力
の供給を受ける手段とを有する電子機器内にあって、二
次電池を充電するための充電制御装置において、電子機
器に外部から電力が供給されているとき、二次電池の残
留電力を判断する残量監視手段を有し、残量監視手段
は、残量が所定値以下になったと判定したとき充電を開
始させる。
In a charge control device for charging a secondary battery in an electronic device having a secondary battery and means for receiving electric power from the outside, the electronic device is supplied with power from the outside. Is supplied, it has a remaining amount monitoring means for determining the residual power of the secondary battery, and the remaining amount monitoring means starts charging when it is determined that the remaining amount is less than or equal to a predetermined value.

【0018】残量の所定値の判定には、二次電池の電圧
を監視して、所定の電圧以下になったことを検出しても
よいし、二次電池への充電が完了した時点からの経過時
間を測定し、所定の値になったときとしてもよい。
To determine the predetermined value of the remaining amount, the voltage of the secondary battery may be monitored to detect that the voltage has dropped below the predetermined voltage, or from the time when the charging of the secondary battery is completed. The elapsed time may be measured and the time may be set to a predetermined value.

【0019】[0019]

【作用】Li+ 二次電池は満充電状態のときの電圧が最も
高く、放電が進むに従って電圧が低下する特性をもつ。
言い換えれば電圧測定することで電池の残量を判定する
ことが容易である。従って、ACアダプタ等により外部
から電力が供給されている状態のとき、二次電池の電圧
が所定の電圧以下になったら充電を開始することで、電
池の自己放電分を補い、常に満充電状態に近い状態を維
持することが可能となる。
[Function] The Li + secondary battery has the highest voltage when fully charged and has the characteristic that the voltage decreases as the discharge progresses.
In other words, it is easy to determine the remaining battery level by measuring the voltage. Therefore, when power is being supplied from the outside by an AC adapter or the like, charging is started when the voltage of the secondary battery falls below a predetermined voltage to compensate for the self-discharge of the battery and always maintain a fully charged state. It is possible to maintain a state close to.

【0020】また、電池の自己放電の程度は電池種類に
より異なり、環境温度によって左右されるが、自己放電
による目減り分は大略時間に比例するとしてよい。従っ
て、ACアダプタ等により外部から電力が供給されてい
る状態のとき、二次電池への充電が完了した時点から経
過時間を測定して、所定の時間が経過したら充電を開始
することで、電池の自己放電分を補い、常に満充電状態
に近い状態を維持することが可能となる。
The degree of self-discharge of the battery varies depending on the type of the battery and depends on the environmental temperature, but the amount of reduction due to self-discharge may be approximately proportional to the time. Therefore, when the power is supplied from the outside by the AC adapter or the like, the elapsed time is measured from the time when the charging of the secondary battery is completed, and the charging is started when the predetermined time elapses. It becomes possible to supplement the self-discharging amount of, and always maintain a state close to a fully charged state.

【0021】[0021]

【実施例】以下に本発明を適用した Li+二次電池用の充
電制御装置の例を説明する。図1は実施例のハードウェ
ア構成図であり、図2はその動作説明フローチャートで
ある。 通常の充電制御装置は、定電流/定電圧制御回
路21、電圧・電流測定回路22、マイクロコントローラに
よる充電制御部23、および外部給電を検出する電圧比較
器CMP と基準電圧e 、充電電流測定用の抵抗R1、逆流防
止用のダイオードD1,D2,D3よりなる。このハードウェア
構成そのものは従来技術の Li+二次電池用の充電制御装
置と異なるところはない。
EXAMPLES An example of a charge control device for a Li + secondary battery to which the present invention is applied will be described below. FIG. 1 is a hardware configuration diagram of the embodiment, and FIG. 2 is a flowchart for explaining the operation thereof. A normal charge control device is a constant current / constant voltage control circuit 21, a voltage / current measurement circuit 22, a charge control unit 23 by a microcontroller, and a voltage comparator CMP that detects external power supply and a reference voltage e for measuring the charge current. Resistance R 1 and diodes D 1 , D 2 and D 3 for preventing backflow. The hardware configuration itself is no different from the conventional charge control device for Li + secondary batteries.

【0022】ACアダプタ1は定電圧の直流DC-IN を供
給する。充電制御部 (マイクロコントローラ) 23は、定
電流/定電圧制御回路21に対して充電の開始や停止(ON
/OFF信号) 、および電流値の大小等を指示するための充
電に関する制御を行う。ダイオード D1,D3は、機器がA
Cアダプタ1に接続されているがAC電力が供給されて
いないとき、電池の電力がACアダプタ側に漏洩するの
を防止する。ダイオードD2は、ACアダプタ1により外
部から電力が供給されているとき、ACアダプタ1の電
力が電池3に直接印加されるのを防止する。
The AC adapter 1 supplies a constant voltage DC DC-IN. The charge control unit (microcontroller) 23 starts and stops (ON) the constant current / constant voltage control circuit 21.
/ OFF signal), and control related to charging to instruct the magnitude of the current value. The diode D 1 , D 3 is A
When the battery is connected to the C adapter 1 but AC power is not supplied, the battery power is prevented from leaking to the AC adapter side. The diode D 2 prevents the power of the AC adapter 1 from being directly applied to the battery 3 when the power is supplied from the outside by the AC adapter 1.

【0023】電圧・電流測定回路22は、電池3を充電す
るときや充電するときの電圧、電流、を測定して充電制
御部23に与える。抵抗 R1 は電池からの充放電電流を測
定するためのシャント抵抗である。
The voltage / current measuring circuit 22 measures the voltage and the current when the battery 3 is charged and when the battery 3 is charged, and supplies it to the charge controller 23. The resistance R 1 is a shunt resistance for measuring the charge / discharge current from the battery.

【0024】定電流/定電圧制御回路21は、始めは定電
流で、後に定電圧で電池3への充電電流を流す制御回路
である。制御部210 はオペアンプ(エラーアンプ)2個
を有し、抵抗R2に流れる電流値と出力側の電圧値が決め
られた上限を越えないようにスイッチングトランジスタ
FET をON/OFFする。外部から供給される直流はスイッ
チングトランジスタFET により制御部210 の指示に従っ
てスイッチングされる。その出力は、L,C1,D5 による平
滑回路で平滑され電池3に加えられる。これは、公知の
スイッチング・レギュレーション技術である。制御部21
0 としては、市販のスイッチング・レギュレータ・コン
トローラ、例えば富士通製のMB3759等を使うこと
ができる。
The constant current / constant voltage control circuit 21 is a control circuit for supplying a charging current to the battery 3 with a constant current at the beginning and later with a constant voltage. The control unit 210 has two operational amplifiers (error amplifiers) and uses switching transistors so that the current value flowing through the resistor R 2 and the voltage value on the output side do not exceed the predetermined upper limits.
Turn FET on / off. The direct current supplied from the outside is switched by the switching transistor FET according to the instruction of the control unit 210. The output is smoothed by the smoothing circuit by L, C 1 and D 5 and added to the battery 3. This is a known switching regulation technique. Control unit 21
As 0, a commercially available switching regulator controller such as MB3759 manufactured by Fujitsu can be used.

【0025】以下に、図2のフローチャートにより、実
施例の動作を説明する。 充電開始処理:従来どおりにACアダプタによる電力供
給の開始の検出(S1)あるいは電池の装着(S2)を契機とし
て二次電池への充電開始指示ONを出す(S3)。
The operation of the embodiment will be described below with reference to the flowchart of FIG. Charging start processing: As in the conventional case, the charging start instruction ON to the secondary battery is issued (S3) upon detection of the start of power supply by the AC adapter (S1) or battery mounting (S2).

【0026】これにより、ハードウェアは、図3(2)
に示したように始めは定電流で充電を行い、電圧が所定
値に達すると定電圧での充電を行う。なお、充電制御部
23から充電電流の大小を指定する信号R/S により急速充
電、標準充電の区別ができるが、本発明には直接関係な
いので説明は省略する。
As a result, the hardware becomes as shown in FIG.
As shown in, the charging is performed with a constant current at first, and when the voltage reaches a predetermined value, the charging is performed with a constant voltage. The charging control unit
A quick charge and a standard charge can be distinguished from a signal R / S that specifies the magnitude of the charging current from 23, but the description is omitted because it is not directly related to the present invention.

【0027】充電の終了処理:Li+二次電池の場合は、
充電電流を監視し、所定の充電電流値(通常、0.1C:10
00mAHの容量で 100mA)以下になったことを検出(S
6)したとき、または、充電開始から所定の時間(例えば
2時間)を経過したとき(S5)に、充電の終了指示OFF(S
7) を出す。なお、ピーク電圧の検出、絶対温度が規定
値を越えたことの検出、ΔT/Δt が規定値以上になった
ことの検出等の充電完了検出手法を併用してもよい。
Charge termination processing: In the case of Li + secondary battery,
The charging current is monitored and the specified charging current value (usually 0.1C: 10
Detected that the capacity of 00mAH was 100mA or less (S
6) or when a predetermined time (for example, 2 hours) has elapsed from the start of charging (S5), the charging end instruction is turned OFF (S
7) Put out. A charging completion detection method such as peak voltage detection, detection of absolute temperature exceeding a specified value, or detection of ΔT / Δt exceeding a specified value may be used together.

【0028】放電監視処理:充電完了後、電池の電圧を
監視し、限度として定めた値に達したことを検出すると
(S9)、または経過時間が限度として定めた値に達すると
(S10) 、充電開始の指示ONを出す(S3)。
Discharge monitoring process: After charging is completed, the voltage of the battery is monitored, and when it is detected that the limit value has been reached.
(S9), or when the elapsed time reaches the value set as the limit
(S10), the charging start instruction is turned on (S3).

【0029】充電完了後、ACアダプタから装置に電力
が供給されている状態では、電池の電力は自己放電によ
り消費されるのみであり、Li+ 二次電池においては非常
に少ない。2セル直列の公称電圧7.2V(MAX8.
4V)の電池で8Vになった時点では80〜85%の容
量が残っている。また、充電終了から1000時間程度でも
同程度の残量と考えられる。この状態で充電を開始すれ
ば、満充電状態に復帰できる。従って、常時満充電に近
い電力を確保できる。この補充のための充電間隔は1〜
2ヵ月に一回であり、電池の劣化への影響は少ない
After the completion of charging, in the state where the power is supplied from the AC adapter to the device, the power of the battery is only consumed by self-discharge, and is very small in the Li + secondary battery. Two cells in series with a nominal voltage of 7.2 V (MAX8.
The capacity of 80 to 85% remains at the time of reaching 8 V with the battery of 4 V). Also, it is considered that the remaining amount is about the same even after 1000 hours from the end of charging. If charging is started in this state, the state of full charge can be restored. Therefore, it is possible to always secure electric power close to full charge. The charging interval for this replenishment is 1
Once every two months, little impact on battery deterioration

【0030】[0030]

【発明の効果】以上説明したように、本発明によれば、
装置に内蔵される電池がリチウムイオン二次電池のよう
な、単純な回路によるトリクル充電方式を使うことがで
きない電池でも、ACアダプタ等により外部から電力の
供給を受けている状態では、常に残量を一定値以上に
し、満充電の状態に近い状態に保つことができる。
As described above, according to the present invention,
Even if the battery built into the device cannot use the trickle charging method with a simple circuit, such as a lithium-ion secondary battery, it will always remain charged when power is externally supplied from an AC adapter, etc. Can be maintained at a value close to a fully charged state by setting the value above a certain value.

【図面の簡単な説明】[Brief description of drawings]

【図1】 実施例のハードウェア構成図FIG. 1 is a hardware configuration diagram of an embodiment

【図2】 実施例の動作説明フローチャートFIG. 2 is a flowchart for explaining the operation of the embodiment.

【図3】 充電時の電圧・電流の変化[Fig. 3] Changes in voltage and current during charging

【図4】 トリクル充電回路FIG. 4 Trickle charging circuit

【符号の説明】[Explanation of symbols]

1 ACアダプタ 2 充電制御装置 21 定電流/定電圧制御回路 22 電圧・電流測定回路 23 充電制御部(マイクロコントローラ) D1〜D5 ダイオード CMP 電圧比較器 FET スイッチングトランジスタ L インダクタ C コンデンサ R0〜 R2 抵抗 3 二次電池 4 トリクル充電回路1 AC adapter 2 Charge control device 21 Constant current / constant voltage control circuit 22 Voltage / current measurement circuit 23 Charge control unit (microcontroller) D 1 to D 5 diode CMP voltage comparator FET switching transistor L inductor C capacitor R 0 to R 2 resistance 3 secondary battery 4 trickle charging circuit

───────────────────────────────────────────────────── フロントページの続き (72)発明者 田中 信夫 神奈川県川崎市中原区上小田中1015番地 富士通株式会社内 (72)発明者 小澤 秀清 神奈川県川崎市中原区上小田中1015番地 富士通株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Nobuo Tanaka, No. 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa, Fujitsu Limited (72) Inventor, Hideki Ozawa 1015, Kamikodanaka, Nakahara-ku, Kawasaki, Kanagawa (within Fujitsu Limited)

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 二次電池と外部から電力の供給を受ける
手段とを有する電子機器内にあって、二次電池を充電す
るための充電制御装置であって、 電子機器に外部から電力が供給されているとき、二次電
池の残留電力を判断する残量監視手段を有し、 残量監視手段は、残量が所定値以下になったと判定した
とき充電を開始させることを特徴とする充電制御装置。
1. A charging control device for charging a secondary battery in an electronic device having a secondary battery and means for receiving electric power from the outside, wherein the electronic device is supplied with electric power from the outside. Charging means characterized by having a remaining amount monitoring means for determining the residual power of the secondary battery, and the remaining amount monitoring means starting charging when it is determined that the remaining amount is below a predetermined value. Control device.
【請求項2】 残量監視手段は、二次電池の電圧を監視
して、所定の電圧以下になったことを検出したとき充電
を開始させることを特徴とする請求項1に記載の充電制
御装置。
2. The charge control according to claim 1, wherein the remaining amount monitoring means monitors the voltage of the secondary battery and starts charging when it detects that the voltage has dropped below a predetermined voltage. apparatus.
【請求項3】 残量監視手段は、二次電池への充電が完
了した時点からの経過時間を測定し、所定時間が経過し
たとき充電を開始させることを特徴とする請求項1に記
載の充電制御装置。
3. The remaining amount monitoring means measures the elapsed time from the time when charging of the secondary battery is completed, and starts charging when a predetermined time has elapsed. Charge control device.
JP31032494A 1994-12-14 1994-12-14 Charging controller Pending JPH08168192A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP31032494A JPH08168192A (en) 1994-12-14 1994-12-14 Charging controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31032494A JPH08168192A (en) 1994-12-14 1994-12-14 Charging controller

Publications (1)

Publication Number Publication Date
JPH08168192A true JPH08168192A (en) 1996-06-25

Family

ID=18003869

Family Applications (1)

Application Number Title Priority Date Filing Date
JP31032494A Pending JPH08168192A (en) 1994-12-14 1994-12-14 Charging controller

Country Status (1)

Country Link
JP (1) JPH08168192A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009153339A (en) * 2007-12-21 2009-07-09 Panasonic Electric Works Co Ltd Ac power distribution system
WO2009104348A1 (en) * 2008-02-18 2009-08-27 パナソニック株式会社 Charge control circuit, and charging device equipped with charge control circuit, battery pack
JP2011120316A (en) * 2009-11-30 2011-06-16 Toshiba Corp Electronic apparatus
JP2012523650A (en) * 2009-04-14 2012-10-04 宇太光▲電▼科技股▲分▼有限公司 Power supply and double rechargeable battery pack in it
JP2016140136A (en) * 2015-01-26 2016-08-04 クロイ電機株式会社 Secondary battery charge control circuit

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009153339A (en) * 2007-12-21 2009-07-09 Panasonic Electric Works Co Ltd Ac power distribution system
WO2009104348A1 (en) * 2008-02-18 2009-08-27 パナソニック株式会社 Charge control circuit, and charging device equipped with charge control circuit, battery pack
JP2009195081A (en) * 2008-02-18 2009-08-27 Panasonic Corp Charging control circuit, charger device equipped with circuit, and battery pack
CN101939893A (en) * 2008-02-18 2011-01-05 松下电器产业株式会社 Charge control circuit, and charging device equipped with charge control circuit, battery pack
US8330427B2 (en) 2008-02-18 2012-12-11 Panasonic Corporation Charge control circuit, and charging device and battery pack incorporated with the same
JP2012523650A (en) * 2009-04-14 2012-10-04 宇太光▲電▼科技股▲分▼有限公司 Power supply and double rechargeable battery pack in it
JP2011120316A (en) * 2009-11-30 2011-06-16 Toshiba Corp Electronic apparatus
JP2016140136A (en) * 2015-01-26 2016-08-04 クロイ電機株式会社 Secondary battery charge control circuit

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