【０００１】[0001]
【産業上の利用分野】本発明は、電池駆動可能な電子機
器において、内蔵電池に２次電池を用いた場合の充電回
路に係わり、特に前記２次電池に微少電流で充電を行う
トリクル充電後、検出回路による所定の電圧上昇に伴っ
て急速充電に切換えを行う２次電池の充電回路に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging circuit when a secondary battery is used as a built-in battery in an electronic device which can be driven by a battery, and in particular, after trickle charging for charging the secondary battery with a minute current. The present invention relates to a charging circuit for a secondary battery, which switches to rapid charging with a predetermined voltage rise by a detection circuit.
【０００２】[0002]
【従来の技術】一般にポータブルタイプの電子機器は、
交流電源にＡＣアダプタを接続し、交流電圧を直流電圧
に変換して、機器本体を駆動すると共に、該機器に内蔵
の２次電池を備えたバッテリパックの上記２次電池を充
電する構成が広く用いられている。2. Description of the Related Art Generally, portable electronic devices are
An AC adapter is connected to an AC power source, an AC voltage is converted into a DC voltage to drive a device body, and the secondary battery of a battery pack having a secondary battery built in the device is charged. It is used.
【０００３】この場合、近年はニッケルカドミウム電池
のように充電時間の短い急速充電可能な２次電池に対し
て微少電源によるトリクル充電と大電流による急速充電
が用いられており、充電回路としては図４の通り、ＡＣ
アダプタから微少電流時トリクル充電抵抗（ＲT）を介
して充電電流を供給する構成が採用されている。前記図
４において、ＡＣアダプタの出力側から前記バッテリパ
ックに対して先ず電子スイッチ（Ｓ1）を閉じトリクル
充電抵抗（ＲT）を介して微少電流によりトリクル充電
を行い、検出回路によって、バッテリパックの端子電圧
を検出して、所定電圧に達すると、充電制御回路の制御
出力で、前記電子スイッチ（Ｓ1）をオフにすると共に
電子スイッチ（Ｓ2）を閉じ、急速充電電流を供給して
バッテリパック内の２次電池を充電する構成となってい
る。In this case, in recent years, trickle charging by a minute power source and rapid charging by a large current have been used for a secondary battery capable of rapid charging such as a nickel-cadmium battery and having a short charging time. AC as 4
A configuration is adopted in which a charging current is supplied from an adapter through a trickle charging resistance (RT ) at a minute current. In FIG. 4, the electronic switch (S1 ) is first closed from the output side of the AC adapter to the battery pack, trickle charging is performed by a minute current through the trickle charging resistor (RT ), and the battery pack is detected by the detection circuit. When the terminal voltage is detected and reaches a predetermined voltage, the electronic output (S1 ) is turned off and the electronic switch (S2 ) is closed by the control output of the charge control circuit to supply the quick charge current. It is configured to charge the secondary battery in the battery pack.
【０００４】なお図中スイッチ（Ｓ3）は負荷回路の電
源をオン・オフするための主スイッチである。これに類
似した構成が特開平２−３０７３３６号公報に示されて
おり、種々の検知器がΔＴ等の検知を行い、急速充電の
開始又は停止を制御している。The switch (S3 ) in the figure is a main switch for turning on / off the power source of the load circuit. A configuration similar to this is disclosed in Japanese Patent Application Laid-Open No. 2-307336, in which various detectors detect ΔT or the like and control start or stop of rapid charging.
【０００５】[0005]
【発明が解決しようとする課題】前述の従来の第１例
（図４）では、ニッケルカドミウム電池等の２次電池で
は、デンドライトショート（dendrite short 電池内の
模樹状のショート現象）が発生した場合、容量が残存し
ている電池に対して充電による復活ができない。更に長
時間の連続トリクル充電は該２次電池の寿命に対して特
性上悪影響を与えてしまう。次に第２例では、各種の検
知器が必要となり、それらのみではデンドライトショー
トの発生時に、２次電池の復活が図れない。DISCLOSURE OF THE INVENTION In the above-described first example (FIG. 4) of the related art, a dendrite short (a tree-like short circuit phenomenon in a battery) occurs in a secondary battery such as a nickel-cadmium battery. In this case, the battery with the remaining capacity cannot be restored by charging. Further, continuous trickle charging for a long time adversely affects the life of the secondary battery. Next, in the second example, various types of detectors are required, and the secondary batteries cannot be revived when a dendrite short circuit occurs with only those detectors.
【０００６】そこで本発明は前述のデンドライトショー
ト発生時の対策及び連続トリクル充電を防止する新規な
２次電池の充電回路を提供する。Therefore, the present invention provides a countermeasure for the occurrence of the above-mentioned dendrite short circuit and a novel secondary battery charging circuit for preventing continuous trickle charging.
【０００７】[0007]
【課題を解決するための手段】本発明は、ＡＣアダプタ
等の電源変換手段、２次電池を有するバッテリパック、
前記２次電池にトリクル充電及び急速充電の各々に対応
する充電電流を切換えて供給するスイッチ手段、充電制
御回路、負荷回路を備えた電子機器において、前記トリ
クル充電時に２次電池が所定の電圧に上昇した際、サー
ジ電流発生回路により一時的に大電流を前記２次電池に
供給し、急速充電に切換える構成である。The present invention provides a power conversion means such as an AC adapter and a battery pack having a secondary battery,
In an electronic device equipped with a switch means, a charging control circuit, and a load circuit for switching and supplying charging currents corresponding to trickle charging and quick charging to the secondary battery, the secondary battery is set to a predetermined voltage during the trickle charging. When the voltage rises, a surge current generating circuit temporarily supplies a large current to the secondary battery to switch to rapid charging.
【０００８】[0008]
【作用】本発明では、トリクル充電時にサージ電流発生
回路からの大電流供給によりデンドライトショートのメ
カニズムで２次電池の劣化を防止すると共にデンドライ
トショートからの復活が図れる。According to the present invention, when a trickle is charged, a large current is supplied from the surge current generating circuit to prevent the secondary battery from deteriorating due to the dendrite short circuit mechanism and to recover from the dendrite short circuit.
【０００９】[0009]
【実施例】図面に従って説明すると、図１は本発明の２
次電池の充電回路の基本ブロック図、図２は同回路の具
体的な回路図、図３は同回路の説明波形図を示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the drawings, FIG.
2 is a basic block diagram of a charging circuit for the secondary battery, FIG. 2 is a specific circuit diagram of the circuit, and FIG. 3 is an explanatory waveform diagram of the circuit.
【００１０】図面において、（１）は電源プラグ、
（２）は交流を直流に変換する電圧変換手段としてのＡ
Ｃアダプター、（３）は充電制御回路（４）によって制
御される電子スイッチ、（５）は２次電池（６）（６）
…（６）を有するバッテリパック、（７）は前記バッテ
リパックの端子電圧、温度等を検出する検出回路、
（８）は負荷回路、（９）は前記負荷の電源をオン・オ
フする電源スイッチ、（１０）は前記ＡＣアダプタを等
価的に置換えた定電流源、（１１）はトリクル充電抵
抗、（１２）は抵抗（１３）及びコンデンサ（１４）よ
り成るサージ電流発生回路、（１５）はトリクル充電用
の第１スイッチ、（１６）は急速充電用の第２スイッチ
を示す。In the drawings, (1) is a power plug,
(2) is A as voltage converting means for converting alternating current to direct current
C adapter, (3) electronic switch controlled by charging control circuit (4), (5) secondary battery (6) (6)
A battery pack having (6), (7) a detection circuit for detecting the terminal voltage, temperature, etc. of the battery pack,
(8) is a load circuit, (9) is a power switch for turning on / off the power of the load, (10) is a constant current source equivalently replacing the AC adapter, (11) is trickle charging resistance, (12) ) Is a surge current generating circuit including a resistor (13) and a capacitor (14), (15) is a first switch for trickle charging, and (16) is a second switch for rapid charging.
【００１１】次に本発明回路の動作について説明する
と、図１におけるＡＣアダプタ（２）を動作上定電源と
みなし、開放電圧をバッテリパック（５）内の２次電池
のバッテリセル数（ｎ）×２Ｖ（約２ｎＶ）とし、更に
充電制御回路（４）によって制御される電子スイッチ
（３）を２個の電子スイッチに等価的に置換えると、実
質的に図２がその等価回路となる。Explaining the operation of the circuit of the present invention, the AC adapter (2) in FIG. 1 is regarded as a constant power source for operation, and the open circuit voltage is the number of battery cells (n) of the secondary battery in the battery pack (5). If the electronic switch (3) controlled by the charge control circuit (4) is equivalently replaced with two electronic switches, the equivalent circuit is shown in FIG.
【００１２】そこで図２において、定電流源（１０）に
よって充電制御回路（４）に直流電圧を供給すると共に
トリクル充電のために前記充電制御回路（４）からの制
御出力によって第１スイッチ（１５）及び第２スイッチ
（１６）をオフ（開放）した状態で、サージ電流発生回
路（１２）に電流を供給し、コンデンサ（１４）を充電
する。Therefore, in FIG. 2, the direct current voltage is supplied to the charging control circuit (4) by the constant current source (10), and the first switch (15) is operated by the control output from the charging control circuit (4) for trickle charging. ) And the second switch (16) are turned off (open), current is supplied to the surge current generation circuit (12) to charge the capacitor (14).
【００１３】このときバッテリパック（５）内の２次電
池がデンドライトショート状態になっていると、前記充
電制御回路（４）からの制御出力で第１スイッチ（１
５）をオンに（閉成）する。At this time, if the secondary battery in the battery pack (5) is in the dendrite short-circuit state, the control output from the charge control circuit (4) causes the first switch (1).
5) is turned on (closed).
【００１４】これにより前記コンデンサ（１４）に蓄積
された電荷によるサージ電流（ＩS）が、２次電池
（６）（６）…（６）に対し流れる。ＩSは次式で表さ
れる。As a result, a surge current (IS ) due to the charges accumulated in the capacitor (14) flows to the secondary batteries (6) (6) ... (6). IS is expressed by the following equation.
【００１５】ＩS＝（定電流源開発電圧−電池電圧）／
（内部配線抵抗＋ＲD） このサージ電流（ＩS）によってデンドライトショート
状態になった２次電池に大電流が流れて、その２次電池
は正常に復帰し、活性状態に復活する。IS = (constant current source development voltage-battery voltage) /
(Internal wiring resistance + RD ) Due to this surge current (IS ), a large current flows through the secondary battery that is in the dendrite short-circuit state, and the secondary battery is normally restored and restored to the active state.
【００１６】前記デンドライト状態の２次電池が復活し
たことを検出回路（７）によって端子電圧の上昇を検出
し、それに伴って充電制御回路（４）からの制御出力に
より第２スイッチ（１６）をオン（閉成）にして急速充
電に切換え、２次電池（６）（６）…（６）は通常の急
速充電が行われ、以後満充電時には前記検出回路（７）
からΔＶ及び温度上昇に対応する検出出力により充電制
御回路（４）を駆動して、第２スイッチ（１６）をオフ
（開放）にする。The detection circuit (7) detects the rise of the terminal voltage when the secondary battery in the dendrite state is restored, and accordingly the second switch (16) is turned on by the control output from the charging control circuit (4). When the secondary batteries (6), (6), ... (6) are turned on (closed) and switched to rapid charging, normal rapid charging is performed, and thereafter, when fully charged, the detection circuit (7).
To ΔV and the detection output corresponding to the temperature rise drive the charging control circuit (4) to turn off (open) the second switch (16).
【００１７】この模様を図３のタイミングチャートを用
いて説明すると、図３（イ）は第１スイッチ（１５）を
オン、オフする充電制御回路（４）の制御出力で、ハイ
レベルがオンを表す。図３（ロ）は急速充電用の第２ス
イッチ（１６）をオン、オフする充電制御回路（４）の
制御出力を示す。図３（ハ）は２次電池（６）（６）…
（６）に供給される。充電電流（ＩC）でＩTはトリクル
充電電流値、図３（ニ）は電池電圧（ＶB）を示す。図
３における各タイミングで、Ｔ1はサージ電流発生回路
におけるコンデンサ（１４）に電荷が充電される時間、
Ｔ2は前記コンデンサ（１４）からバッテリパック
（５）内の２次電池（６）（６）…（６）にサージ電流
が流れる時間、Ｔ3はコンデンサ（１４）の電荷の放電
が終了し、トリクル充電が流れる時間、Ｔ4はコンデン
サ（１４）からサージ電流によって２次電池（６）
（６）…（６）が正常に復帰して電圧が上昇する時間、
Ｔ6は定電流源（１０）から急速充電電流が流れる期間
を示す。This pattern will be described with reference to the timing chart of FIG. 3. In FIG. 3A, the control output of the charging control circuit (4) for turning on and off the first switch (15) is high level. Represent FIG. 3B shows the control output of the charge control circuit (4) for turning on and off the second switch (16) for rapid charging. FIG. 3C shows a secondary battery (6) (6) ...
It is supplied to (6). IT trickle charge current value in the charging current (IC), FIG. 3 (d) shows a battery voltage (VB). At each timing in FIG. 3, T1 is the time during which the capacitor (14) in the surge current generating circuit is charged with electric charge,
T2 is the time during which a surge current flows from the capacitor (14) to the secondary batteries (6) (6) ... (6) in the battery pack (5), and T3 is when the discharge of the charge of the capacitor (14) is completed. , Trickle charging time, T4 is the secondary battery (6) due to surge current from the capacitor (14)
(6) The time when (6) returns to normal and the voltage rises,
T6 indicates a period in which the rapid charging current flows from the constant current source (10).
【００１８】なお前述のトリクル充電は、充電制御回路
（４）に予め設定しておき、第１スイッチ（１５）のオ
ン、オフの回数が定められる。The trickle charge described above is preset in the charge control circuit (4) to determine the number of times the first switch (15) is turned on and off.
【００１９】前述の動作において、仮に期間Ｔ2，Ｔ3の
間でバッテリパック（５）内の２次電池（６）（６）…
（６）の端子電圧（ＶB）が正常な値まで上昇しなけれ
ば、更にこれを数回繰返して、それでも上昇しなけれ
ば、２次電池（６）（６）…（６）の中で完全にショー
トしていると充電制御回路（４）が判断し、充電電流の
供給を断って、バッテリ異常の警報表示（ＬＥＤ、ラン
プ等）を点灯させて、使用者にバッテリパックの交換の
必要性を知らせれば良い。In the above-mentioned operation, it is assumed that the secondary batteries (6) (6) in the battery pack (5) are temporarily set between the periods T2 and T3 .
If the terminal voltage (VB ) of (6) does not rise to a normal value, this is repeated several times, and if it still does not rise, in the secondary batteries (6) (6) ... (6) The charging control circuit (4) determines that the battery is completely shorted, cuts off the charging current supply, lights the battery abnormality warning display (LED, lamp, etc.), and requires the user to replace the battery pack. All you have to do is inform your sex.
【００２０】[0020]
【発明の効果】本発明の２次電池の充電回路によれば、
まずトリクル充電を長時間行う従来例の欠点は除去でき
２次電池の短寿命化は防止できる。更に本発明回路で
は、交流／直流変換回路の出力側を定電流源とした場合
に充電制御回路も駆動でき、機器の小型化が図れ、また
バッテリパック内の２次電池がデンドライトショートを
生じていたときには、一時的な大電流としてサージ電流
を流し、その２次電池を正常に復帰させることができる
利点が得られると共にトリクル充電がパルス充電可能と
なり、補充電時も連続波でないので、２次電池の劣化が
防げ、本発明回路はポータブルタイプの電子機器に用い
れば、その効果は極めて大である。According to the secondary battery charging circuit of the present invention,
First, the drawbacks of the conventional example in which trickle charging is performed for a long time can be eliminated, and shortening of the life of the secondary battery can be prevented. Further, in the circuit of the present invention, when the output side of the AC / DC conversion circuit is used as a constant current source, the charging control circuit can be driven, the device can be downsized, and the secondary battery in the battery pack has a dendrite short circuit. In this case, a surge current is sent as a temporary large current, and the advantage that the secondary battery can be returned to normal can be obtained, and trickle charging can be pulse-charged. The deterioration of the battery can be prevented, and the effect of the circuit of the present invention is extremely large when used in a portable type electronic device.
【００２１】なおバッテリパック（５）によって負荷回
路（８）を動作させる場合は、図１でのＡＣアダプタ
（２）がオフとなり、図２における定電流源（１０）か
らの電流供給が断たれて、電源スイッチ（９）をオンに
すると負荷回路（８）にダイオード（Ｄ1）を介して負
荷電流が供給される。このときダイオード（Ｄ2）は逆
流防止用として働き、充電制御回路（４）及び前段の種
々の素子への電流は抑制される。When the load circuit (8) is operated by the battery pack (5), the AC adapter (2) in FIG. 1 is turned off, and the current supply from the constant current source (10) in FIG. 2 is cut off. Then, when the power switch (9) is turned on, the load current is supplied to the load circuit (8) through the diode (D1 ). At this time, the diode (D2 ) works to prevent backflow, and currents to the charge control circuit (4) and various elements in the preceding stage are suppressed.
【図１】本発明の基本ブロック図である。FIG. 1 is a basic block diagram of the present invention.
【図２】本発明の具体的な回路図である。FIG. 2 is a specific circuit diagram of the present invention.
【図３】図２の説明波形図を示す。FIG. 3 shows an explanatory waveform diagram of FIG.
【図４】従来の２次電池の充電回路を示す回路図であ
る。FIG. 4 is a circuit diagram showing a conventional charging circuit for a secondary battery.
（２） ＡＣアダプタ （３） 電子スイッチ （４） 充電制御回路 （６） ２次電池 （７） 検出回路 （１０） 定電流源 （１２） サージ電流発生回路 （１５） 第１スイッチ （１６） 第２スイッチ (2) AC adapter (3) Electronic switch (4) Charge control circuit (6) Secondary battery (7) Detection circuit (10) Constant current source (12) Surge current generation circuit (15) First switch (16) No. 2 switches
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31340292AJP3219498B2 (en) | 1992-11-24 | 1992-11-24 | Rechargeable battery charging circuit |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31340292AJP3219498B2 (en) | 1992-11-24 | 1992-11-24 | Rechargeable battery charging circuit |
| Publication Number | Publication Date |
|---|---|
| JPH06165402Atrue JPH06165402A (en) | 1994-06-10 |
| JP3219498B2 JP3219498B2 (en) | 2001-10-15 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31340292AExpired - Fee RelatedJP3219498B2 (en) | 1992-11-24 | 1992-11-24 | Rechargeable battery charging circuit |
| Country | Link |
|---|---|
| JP (1) | JP3219498B2 (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009181907A (en)* | 2008-01-31 | 2009-08-13 | Toyota Motor Corp | Lithium ion secondary battery charging method and charging system |
| CN115549258A (en)* | 2022-10-27 | 2022-12-30 | 维沃移动通信有限公司 | Charging circuit, charging method and electronic device |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009181907A (en)* | 2008-01-31 | 2009-08-13 | Toyota Motor Corp | Lithium ion secondary battery charging method and charging system |
| CN115549258A (en)* | 2022-10-27 | 2022-12-30 | 维沃移动通信有限公司 | Charging circuit, charging method and electronic device |
| Publication number | Publication date |
|---|---|
| JP3219498B2 (en) | 2001-10-15 |
| Publication | Publication Date | Title |
|---|---|---|
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |