JPH11332121A - Charging device - Google Patents
Charging deviceInfo
- Publication number
- JPH11332121A JPH11332121A JP10136937A JP13693798A JPH11332121A JP H11332121 A JPH11332121 A JP H11332121A JP 10136937 A JP10136937 A JP 10136937A JP 13693798 A JP13693798 A JP 13693798A JP H11332121 A JPH11332121 A JP H11332121A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- charging
- secondary battery
- battery
- detected
- 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
Links
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、充電装置に関す
る。[0001] The present invention relates to a charging device.
【０００２】[0002]
【従来の技術】ノートパソコンや携帯電話等の携帯用電
子機器においては、その電源として、二次電池が広く使
用されている。こうした二次電池は、常に満充電状態に
あるのが好ましい。2. Description of the Related Art Secondary batteries are widely used as power sources in portable electronic devices such as notebook personal computers and mobile phones. It is preferable that such a secondary battery is always in a fully charged state.
【０００３】特に、携帯電話やコードレス電話等の電子
機器においては、頻繁に短時間で使用され、その都度満
充電されることになるが、機器の僅かな使用後に通常の
充電、即ち、急速充電し、満充電検出後に補充電を行う
方法では、充電時間が不所望に長くなってしまうばかり
か、二次電池に悪影響を与えてしまう恐れもある。In particular, electronic devices such as cellular phones and cordless telephones are frequently used in a short time and are fully charged each time. However, in the method of performing the supplementary charge after the detection of the full charge, not only the charging time becomes undesirably long, but also the secondary battery may be adversely affected.
【０００４】[0004]
【発明が解決しようとする課題】そこで、本発明は、二
次電池に悪影響を与えることなく、短時間でかつ常に二
次電池を満充電とする充電装置を提供するものである。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a charging device that can always fully charge a secondary battery in a short time without adversely affecting the secondary battery.
【０００５】[0005]
【課題を解決するための手段】本発明の充電装置は、装
着された二次電池の電池電圧を検出する電圧検出手段
と、この電圧検出手段により検出された電池電圧と予め
設定された閾値電圧とを比較する比較手段と、電池電圧
が前記閾値電圧より低いことが検出されると、前記二次
電池を通常モードで充電し、電池電圧が前記閾値電圧よ
り高いことが検出されると、前記二次電池を前記通常モ
ードより短時間化された再充電モードで充電する制御手
段とを備えたことを特徴とするものである。A charging device according to the present invention comprises a voltage detecting means for detecting a battery voltage of a mounted secondary battery, a battery voltage detected by the voltage detecting means and a predetermined threshold voltage. When the battery voltage is detected to be lower than the threshold voltage, the secondary battery is charged in a normal mode, and when it is detected that the battery voltage is higher than the threshold voltage, Control means for charging the secondary battery in a recharge mode shorter in time than the normal mode.
【０００６】[0006]
【発明の実施の形態】図１は本発明の一実施例を示すブ
ロック回路図である。１は商用電力等を入力し、所定の
直流電圧、直流電流を出力する充電電源、２は充電電源
１に接続されて充電される二次電池であり、本実施例で
はリチウムイオン二次電池からなる。３は充電電源１と
二次電池と２の間に配された充電制御スイッチであり、
２個のトランジスタから構成されている。４は二次電池
２の電池電圧を検出する電圧検出回路であり、２個の分
圧抵抗からなる。FIG. 1 is a block circuit diagram showing an embodiment of the present invention. Reference numeral 1 denotes a charging power source that inputs commercial power or the like and outputs a predetermined DC voltage and DC current. Reference numeral 2 denotes a secondary battery that is connected to the charging power source 1 and is charged. Become. Reference numeral 3 denotes a charge control switch disposed between the charging power source 1 and the secondary battery 2;
It is composed of two transistors. Reference numeral 4 denotes a voltage detection circuit for detecting the battery voltage of the secondary battery 2 and includes two voltage dividing resistors.
【０００７】５は二次電池２の充電経路上に配された電
流検出抵抗、６は電流検出抵抗５の両端電圧を増幅する
増幅器であり、電流検出抵抗５及び増幅器６とによっ
て、充電電流を検出する電流検出回路７が構成されてい
る。８は電圧検出回路４及び電流検出回路７により検出
された電池電圧及び充電電流に基づいて、充電制御スイ
ッチのオンオフ制御を行う制御回路である。Reference numeral 5 denotes a current detection resistor arranged on the charging path of the secondary battery 2, and reference numeral 6 denotes an amplifier for amplifying a voltage between both ends of the current detection resistor 5. A current detection circuit 7 for detecting is configured. Reference numeral 8 denotes a control circuit that performs on / off control of a charge control switch based on the battery voltage and the charge current detected by the voltage detection circuit 4 and the current detection circuit 7.
【０００８】図２は制御回路８の動作を示すフローチャ
ートである。図２（Ａ）に示すメインルーチンにあって
は、ステップＳ１において、電圧検出回路４の検出出力
に基づいて、二次電池２が装着されたことを検出する
と、ステップＳ２において、電池電圧と予め決定された
閾値電圧（本実施例では、３．９０Ｖ）とを比較する。
電池電圧が閾値電圧以上であると、処理はステップＳ３
の通常充電サブルーチンへと進む。FIG. 2 is a flowchart showing the operation of the control circuit 8. In the main routine shown in FIG. 2A, when it is detected in step S1 that the secondary battery 2 has been attached based on the detection output of the voltage detection circuit 4, the battery voltage is determined in advance in step S2. A comparison is made with the determined threshold voltage (3.90 V in the present embodiment).
If the battery voltage is equal to or higher than the threshold voltage, the process proceeds to step S3
To the normal charging subroutine.
【０００９】図２（Ｂ）に示す通常充電サブルーチンで
は、まず、ステップＳ１１において、二次電池２の電池
電圧を検出すると、制御回路８は、出力端子Ｐ０より充
電開始信号を出力して充電制御スイッチ３をオン状態と
し、二次電池２の充電を開始すると同時に、充電タイマ
ーが充電時間（例えば、７時間）の計時を開始する。
尚、二次電池２の充電は、定電流・定電圧充電である。In the normal charging subroutine shown in FIG. 2B, first, in step S11, when the battery voltage of the secondary battery 2 is detected, the control circuit 8 outputs a charging start signal from an output terminal P0 to control charging. When the switch 3 is turned on and charging of the secondary battery 2 is started, the charging timer starts counting the charging time (for example, 7 hours).
The charging of the secondary battery 2 is a constant current / constant voltage charging.
【００１０】ステップＳ１２において、電流検出回路７
により検出される充電電流の大きさが、満充電電流（即
ち、４０ｍＡ）となっているか否かが判断される。未だ
満充電電流でない、言い換えれば、充電電流が４０ｍＡ
以上であると、処理はステップＳ１１に戻って、充電が
継続される。一方、充電電流が４０ｍＡ未満となると、
二次電池２は満充電になったと判断され、処理はステッ
プＳ１３に進む。In step S12, the current detection circuit 7
It is determined whether or not the magnitude of the charging current detected by (1) is the full charging current (ie, 40 mA). The charging current is not yet full, in other words, the charging current is 40 mA
If so, the process returns to step S11, and charging is continued. On the other hand, when the charging current is less than 40 mA,
It is determined that the secondary battery 2 has been fully charged, and the process proceeds to step S13.
【００１１】ステップＳ１３においては、充電タイマー
が計時している充電時間がタイムアップしたか否かが判
断される。充電時間がまだ残っている場合、処理はステ
ップＳ１４に進み、二次電池２の補充電が行われる。こ
の補充電は、例えば、充電タイマーが計時する充電時間
がタイムアップするまで充電を継続することにより行わ
れる。In step S13, it is determined whether or not the charging time measured by the charging timer has expired. If the charging time still remains, the process proceeds to step S14, and the secondary battery 2 is supplementarily charged. This supplementary charging is performed, for example, by continuing charging until the charging time measured by the charging timer times out.
【００１２】そして、ステップＳ１３において、充電時
間のタイムアップが判断されると、ステップＳ１５にお
いて、通常充電サブルーチンが終了し、処理はメインル
ーチンに戻る。メインルーチンでは、処理がステップＳ
５に進み、充電制御スイッチ３をオフ状態として、二次
電池２の充電を終了する。If it is determined in step S13 that the charging time has expired, the normal charging subroutine ends in step S15, and the process returns to the main routine. In the main routine, the processing is step S
Proceeding to 5, the charging control switch 3 is turned off, and the charging of the secondary battery 2 is terminated.
【００１３】ところで、メインルーチンのステップＳ２
において、電池電圧が閾値電圧未満（即ち、３．９Ｖ未
満）であると、処理はステップＳ４の再充電サブルーチ
ンへと進む。By the way, step S2 of the main routine
In, if the battery voltage is lower than the threshold voltage (that is, lower than 3.9 V), the process proceeds to the recharge subroutine of step S4.
【００１４】図２（Ｃ）に示す再充電サブルーチンで
は、まず、ステップＳ２１において、二次電池２の電池
電圧を検出すると、制御回路８は、出力端子Ｐ０より充
電開始信号を出力して充電制御スイッチ３をオン状態と
し、二次電池２の充電を開始する。尚、二次電池２の充
電は、定電流・定電圧充電である。ステップＳ２２にお
いて、電圧検出回路４により検出される電池電圧が、満
充電電圧（即ち、４．０５Ｖ）に到達したか否かが判断
され、この満充電電圧に到達するまで、処理はステップ
Ｓ２１とＳ２２とをループする。In the recharging subroutine shown in FIG. 2C, first, in step S21, when the battery voltage of the secondary battery 2 is detected, the control circuit 8 outputs a charging start signal from an output terminal P0 to control charging. The switch 3 is turned on, and charging of the secondary battery 2 is started. The charging of the secondary battery 2 is a constant current / constant voltage charging. In step S22, it is determined whether or not the battery voltage detected by the voltage detection circuit 4 has reached a full charge voltage (that is, 4.05 V). Until the battery voltage reaches the full charge voltage, the process proceeds to step S21. Loop with S22.
【００１５】電池電圧が満充電電圧に到達する（４．０
５Ｖ以上になる）と、ステップＳ２３において、電流検
出回路７により検出される充電電流の大きさが、満充電
電流（即ち、４０ｍＡ）となっているか否かが判断され
る。未だ満充電電流でない、言い換えれば、充電電流が
４０ｍＡ以上であると、処理はステップＳ２１に戻っ
て、充電が継続される。一方、充電電流が４０ｍＡ未満
となると、二次電池２は満充電になったと判断され、処
理はステップＳ２４に進む。When the battery voltage reaches the full charge voltage (4.0)
If it becomes 5 V or more), it is determined in step S23 whether or not the magnitude of the charging current detected by the current detection circuit 7 is the full charging current (ie, 40 mA). If the charging current is not the full charging current yet, in other words, if the charging current is 40 mA or more, the process returns to step S21, and the charging is continued. On the other hand, when the charging current is less than 40 mA, it is determined that the secondary battery 2 is fully charged, and the process proceeds to step S24.
【００１６】ステップＳ２４においては、再充電サブル
ーチンが終了し、処理はメインルーチンに戻る。メイン
ルーチンでは、処理がステップＳ５に進み、充電制御ス
イッチ３をオフ状態として、二次電池２の充電を終了す
る。In step S24, the recharging subroutine ends, and the process returns to the main routine. In the main routine, the process proceeds to step S5, in which the charging control switch 3 is turned off, and the charging of the secondary battery 2 ends.
【００１７】[0017]
【発明の効果】本発明は、装着された二次電池の電池電
圧を検出する電圧検出手段と、この電圧検出手段により
検出された電池電圧と予め設定された閾値電圧とを比較
する比較手段と、電池電圧が前記閾値電圧より低いこと
が検出されると、前記二次電池を通常モードで充電し、
電池電圧が前記閾値電圧より高いことが検出されると、
前記二次電池を前記通常モードより短時間化された再充
電モードで充電する制御手段とを備えたことを特徴とす
るので、二次電池に悪影響を与えることなく、最適に二
次電池を満充電状態にすることができる。According to the present invention, there is provided voltage detecting means for detecting the battery voltage of a mounted secondary battery, and comparing means for comparing the battery voltage detected by the voltage detecting means with a preset threshold voltage. When it is detected that the battery voltage is lower than the threshold voltage, the secondary battery is charged in a normal mode,
When it is detected that the battery voltage is higher than the threshold voltage,
Control means for charging the rechargeable battery in a recharge mode shorter than the normal mode, so that the rechargeable battery is optimally charged without adversely affecting the rechargeable battery. It can be charged.
【図１】本発明の一実施例を示す回路図である。FIG. 1 is a circuit diagram showing one embodiment of the present invention.
【図２】本発明の一実施例の動作を示すフローチャート
である。FIG. 2 is a flowchart showing the operation of one embodiment of the present invention.
１ 充電電源 ２ 二次電池 ３ 充電制御スイッチ ４ 電圧検出回路 ７ 電流検出回路 ８ 制御回路 DESCRIPTION OF SYMBOLS 1 Charge power supply 2 Secondary battery 3 Charge control switch 4 Voltage detection circuit 7 Current detection circuit 8 Control circuit
Claims (1)
る電圧検出手段と、この電圧検出手段により検出された
電池電圧と予め設定された閾値電圧とを比較する比較手
段と、電池電圧が前記閾値電圧より低いことが検出され
ると、前記二次電池を通常モードで充電し、電池電圧が
前記閾値電圧より高いことが検出されると、前記二次電
池を前記通常モードより短時間化された再充電モードで
充電する制御手段とを備えたことを特徴とする充電装
置。A voltage detecting means for detecting a battery voltage of the mounted secondary battery; a comparing means for comparing a battery voltage detected by the voltage detecting means with a predetermined threshold voltage; When it is detected that the voltage is lower than the threshold voltage, the secondary battery is charged in the normal mode, and when it is detected that the battery voltage is higher than the threshold voltage, the time of the secondary battery is shortened compared to the normal mode. And a control unit for charging the battery in the recharge mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10136937A JPH11332121A (en) | 1998-05-19 | 1998-05-19 | Charging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10136937A JPH11332121A (en) | 1998-05-19 | 1998-05-19 | Charging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11332121A true JPH11332121A (en) | 1999-11-30 |
Family
ID=15187037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10136937A Pending JPH11332121A (en) | 1998-05-19 | 1998-05-19 | Charging device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11332121A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6998817B2 (en) | 2002-10-07 | 2006-02-14 | Sanyo Electric Co., Ltd. | Charge control circuit and method of adjusting voltage for detecting full charge of secondary battery in same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0393430A (en) * | 1989-09-04 | 1991-04-18 | Matsushita Electric Ind Co Ltd | Charging controller for battery |
| JPH0550948U (en) * | 1991-12-04 | 1993-07-02 | 日立電子株式会社 | Charger |
| JPH09331636A (en) * | 1996-06-11 | 1997-12-22 | Oki Electric Ind Co Ltd | Charger of secondary battery |
-
1998
- 1998-05-19 JP JP10136937A patent/JPH11332121A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0393430A (en) * | 1989-09-04 | 1991-04-18 | Matsushita Electric Ind Co Ltd | Charging controller for battery |
| JPH0550948U (en) * | 1991-12-04 | 1993-07-02 | 日立電子株式会社 | Charger |
| JPH09331636A (en) * | 1996-06-11 | 1997-12-22 | Oki Electric Ind Co Ltd | Charger of secondary battery |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6998817B2 (en) | 2002-10-07 | 2006-02-14 | Sanyo Electric Co., Ltd. | Charge control circuit and method of adjusting voltage for detecting full charge of secondary battery in same |
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