JPH0591679A - Charging circuit of secondary battery - Google Patents
Charging circuit of secondary batteryInfo
- Publication number
- JPH0591679A JPH0591679A JP24226091A JP24226091A JPH0591679A JP H0591679 A JPH0591679 A JP H0591679A JP 24226091 A JP24226091 A JP 24226091A JP 24226091 A JP24226091 A JP 24226091A JP H0591679 A JPH0591679 A JP H0591679A
- Authority
- JP
- Japan
- Prior art keywords
- secondary battery
- charging
- circuit
- power supply
- 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.)
- Granted
Links
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は二次電池の充電回路に関
し、特に深い充放電および過剰な充電を排除し、二次電
池のサイクル寿命と信頼性を高めた二次電池の充電回路
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rechargeable battery charging circuit, and more particularly to a rechargeable battery charging circuit that eliminates deep charge and discharge and excessive charging to improve the cycle life and reliability of the rechargeable battery.
【０００２】[0002]
【従来の技術】従来のリチウム電池やニッケルカドミニ
ウム電池などの二次電池に対する充電と運用内容につい
ては、図４および図５に示す方法がある。図４は充電回
路を示し、図５は二次電池１と電子回路３１の使用状態
を示す。2. Description of the Related Art There are methods shown in FIGS. 4 and 5 for charging and operating contents of a secondary battery such as a conventional lithium battery or nickel cadmium battery. FIG. 4 shows the charging circuit, and FIG. 5 shows the usage state of the secondary battery 1 and the electronic circuit 31.
【０００３】二次電池は、充放電の繰返し回数、充放電
の大小の程度を示す充放電の深さや充電電流の大きさに
よって寿命が定まり、鉛蓄電池のような大型でメンテナ
ンス可能なものや、充電の都度二次電池を着脱するもの
を除き、用途は一般に限定されている。The life of a secondary battery is determined by the number of times charging and discharging are repeated, the depth of charging and discharging indicating the magnitude of charging and discharging, and the magnitude of charging current. The usage is generally limited, except that the secondary battery is detached each time the battery is charged.
【０００４】従って、メンテナンス可能なものを除き、
充電回路と、二次電池およびその使用回路は互いに分離
する方法がとられていた。Therefore, except for those that can be maintained,
The charging circuit and the secondary battery and its used circuit are separated from each other.
【０００５】また、充電回路は図４に示すように過充電
による二次電池１の影響を緩和するため、充電によって
二次電池１の電圧が規定電圧に達したとき満充電検出回
路２１によりこれを検出し、遅延回路２２で一定時間遅
延させて二次電池１を十分に充電させた後、インバータ
２３の出力でトランジスタ２４をオフとして充電を停止
する。つまり、遅延時間により十分に充電させるととも
に過充電を防止している。また、抵抗Ｒ１により充電電
流の抑制をしている。尚、図４において、抵抗Ｒ２１，
Ｒ２２は電圧設定用である。Further, as shown in FIG. 4, the charging circuit mitigates the influence of the secondary battery 1 due to overcharging. Therefore, when the voltage of the secondary battery 1 reaches a specified voltage due to charging, the full charge detection circuit 21 Is detected and the delay circuit 22 delays it for a certain period of time to fully charge the secondary battery 1, and then the output of the inverter 23 turns off the transistor 24 to stop the charging. In other words, the delay time allows sufficient charging and prevents overcharging. Also, the charging current is suppressed by the resistor R1. In FIG. 4, the resistor R21,
R22 is for voltage setting.
【０００６】一方、電子機器の電源障害に対応したバッ
クアップ用として用いるときは、図６に示す如く大容量
のコンデンサ３３を電源回路２，ダイオードＤ１〜Ｄ３
とともに用いる方法が一般にとられている。On the other hand, when used as a backup for a power failure of an electronic device, a large capacity capacitor 33 is used as shown in FIG. 6 for the power supply circuit 2 and the diodes D1 to D3.
The method used with is generally used.
【０００７】この方法は、図３（ｂ）のコンデンサ放電
特性で表わされるように、コンデンサ３３の放電による
端子間の電圧低下が著しく、一般に負荷電流の小さいメ
モリ回路３２等に用いられ、かつ短時間のバックアップ
用である。As shown in the capacitor discharge characteristic of FIG. 3B, this method is used for the memory circuit 32, etc., in which the voltage drop across the terminals due to the discharge of the capacitor 33 is remarkable, and is generally short, and is short. For time backup.
【０００８】[0008]
【発明が解決しようとする課題】この従来の二次電池の
充電回路では、過充電に対する保護が不十分であり、従
って二次電池の寿命をさらに延し、その信頼性を高める
には充放電電流の極小化らなびに深い充放電の抑止が必
要である。In this conventional charging circuit for a secondary battery, protection against overcharging is insufficient, and therefore charging / discharging is required to further extend the life of the secondary battery and increase its reliability. It is necessary to suppress deep charging and discharging in order to minimize the current.
【０００９】この為、過充電抑止とともに、二次電池の
充電開始電圧の最適化を図るための二次電池の電圧測定
を行ない、その電圧の設定を負荷の電子回路側の電圧に
近づけることによって充電回数の逓減を図り、また二次
電池の充電電流を抑制するため定電流回路を設けること
が必要となる。さらに、二次電池の障害を検出する機能
も必要となる。Therefore, by suppressing the overcharge, the voltage of the secondary battery is measured to optimize the charging start voltage of the secondary battery, and the voltage is set close to the voltage on the electronic circuit side of the load. It is necessary to provide a constant current circuit in order to reduce the number of times of charging and to suppress the charging current of the secondary battery. Furthermore, a function of detecting a failure of the secondary battery is also required.
【００１０】さらに、電源回路のバックアップ用として
二次電池を用いる場合は、従来のコンデンサの使用にお
ける電圧効果に対処できるように上述した諸施策を施し
た二次電池とその充電回路が必要となるといったさまざ
まな問題点がある。Further, when the secondary battery is used as a backup for the power supply circuit, the secondary battery and the charging circuit for the secondary battery, which have been subjected to the above-mentioned measures so as to cope with the voltage effect in the use of the conventional capacitor, are required. There are various problems such as.
【００１１】本発明の目的は上述した欠点を除去し、二
次電池に対する深い充放電と過充電を抑止し、また二次
電池の障害検出を可能とするとともに、コンデンサによ
る電圧効果の問題を大幅に改善したバックアップ用二次
電池を運用しうる二次電池の充電回路を提供することに
ある。The object of the present invention is to eliminate the above-mentioned drawbacks, to prevent deep charge / discharge and overcharge of a secondary battery, to detect a failure of the secondary battery, and to greatly reduce the problem of voltage effect by a capacitor. Another object of the present invention is to provide a secondary battery charging circuit that can operate the improved backup secondary battery.
【００１２】[0012]
【課題を解決するための手段】本発明の二次電池の充電
回路は、二次電池の充電開始電圧を検出し、所定の定電
流による充電を施す充電手段と、前記充電手段によって
昇圧した二次電池の端子電圧が所定の満充電レベルに達
した場合にこれを検出し、過充電抑圧のために設定した
所定の時間経過後に前記充電手段による充電を停止させ
る充電停止手段と、前記充電手段による充電開始後、所
定の時間経過するも二次電池の端子電圧が前記所定の満
充電レベルに達しない場合に二次電池の異常と判定して
充電を停止させる異常判定手段と、二次電池が所定の定
電圧まで低下したときにこれを検出し、前記充電手段に
よって即時充電を行なうとともに、前記異常判定手段に
よる二次電池の異常判定ならびに充電の停止を併せ実行
する電圧低下監視手段とを備えて構成される。A charging circuit for a secondary battery according to the present invention detects a charging start voltage of the secondary battery and performs charging with a predetermined constant current, and a charging device boosted by the charging device. A charging stopping unit that detects when the terminal voltage of the secondary battery reaches a predetermined full charge level, and stops charging by the charging unit after a predetermined time set for suppressing overcharge, and the charging unit. After the start of charging by the battery, the secondary battery is judged to be abnormal if the terminal voltage of the secondary battery does not reach the predetermined full charge level even after a predetermined time has elapsed, and abnormality determination means for stopping the charging; Is detected when the voltage drops to a predetermined constant voltage, the charging means immediately charges the secondary battery, and the abnormality determining means determines whether the secondary battery is abnormal and stops charging. It constructed a stage.
【００１３】また本発明の二次電池の充電回路は、負荷
の電子回路ならびに前記充電回路に共通な電源回路を設
け、前記充電回路と前記二次電池を前記電源回路と前記
負荷の電子回路間に前記電源回路の出力と並行に接続
し、供給電源を含む前記電源回路に障害を有するときに
は前記電子回路に前記二次電池をバックアップ用電源と
して電源を供給するものとして運用する構成を有する。The secondary battery charging circuit of the present invention is provided with a load electronic circuit and a power supply circuit common to the charging circuit, and the charging circuit and the secondary battery are connected between the power supply circuit and the load electronic circuit. Is connected in parallel with the output of the power supply circuit, and when the power supply circuit including the supply power source has a failure, the secondary battery is used as a backup power supply to supply power to the electronic circuit.
【００１４】さらに、本発明の二次電池の充電回路は、
前記充電回路と前記電源回路を含む電源側と、前記二次
電池と前記電子回路を含む負荷側とに着脱自由に分離構
成して運用する構成を有する。Further, the charging circuit for the secondary battery of the present invention comprises:
A power source side including the charging circuit and the power source circuit, and a load side including the secondary battery and the electronic circuit are detachably detachable from each other and operated.
【００１５】[0015]
【実施例】次に、本発明について図面を参照して説明す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.
【００１６】図１は、本発明の第一の実施例の回路図で
ある。FIG. 1 is a circuit diagram of a first embodiment of the present invention.
【００１７】図１に示す実施例は、二次電池を負荷に対
するバックアップ用電源として運用する場合の充電回路
を例とし、二次電池１と、電源回路２と、負荷とする電
子回路３と、本発明に直接かかわる充電回路４のほか、
電源回路２と電子回路３とを結合し電源供給路を形成す
るダイオードＤ１，Ｄ２を備えてなる。The embodiment shown in FIG. 1 exemplifies a charging circuit when a secondary battery is used as a backup power source for a load, and the secondary battery 1, a power supply circuit 2, an electronic circuit 3 as a load, In addition to the charging circuit 4 directly related to the present invention,
The power supply circuit 2 and the electronic circuit 3 are connected to each other to include diodes D1 and D2 that form a power supply path.
【００１８】充電回路４は、二次電池１の満充電状態を
検出する満充電検出回路５，二次電池１の充電開始電圧
を検出する充電開始電圧検出回路６，二次電池１の電圧
低下状態を検出する電圧低下検出回路７，過充電を抑止
する時間制限を付与するための＃１遅延回路８，二次電
池１の障害時の充電時間抑制のための時間設定を行なう
＃２遅延回路１１，電源回路２とともに二次電池に対す
る定電流源を形成するドライブ用増幅器１８およびトラ
ンジスタ１９，＃１遅延回路８の動作設定用のＲＳフリ
ップフロップ１０，ＯＲゲート１５，ＮＯＲゲート１
４，＃２遅延回路１１の動作を制御するＲＳフリップフ
ロップ１２，ＲＳフリップフロップ１０，１２を制御す
るＡＮＤゲート１３，ドライブ用増幅器１８のゲート制
御入力回路としてのインバータ１７およびＯＲゲート１
６のほか、電圧設定用の抵抗Ｒ１〜Ｒ７を備えて成る。The charging circuit 4 includes a full-charge detection circuit 5 for detecting a fully charged state of the secondary battery 1, a charging start voltage detection circuit 6 for detecting a charging start voltage of the secondary battery 1, and a voltage drop of the secondary battery 1. A voltage drop detection circuit 7 for detecting a state, a # 1 delay circuit 8 for giving a time limit for suppressing overcharge, and a # 2 delay circuit for setting a time for suppressing the charging time when the secondary battery 1 has a fault. 11, a drive amplifier 18 and a transistor 19, which form a constant current source for the secondary battery together with the power supply circuit 2, an RS flip-flop 10, an OR gate 15, and a NOR gate 1 for setting the operation of the # 1 delay circuit 8.
4, an RS flip-flop 12 for controlling the operation of the # 2 delay circuit 11, an AND gate 13 for controlling the RS flip-flops 10, 12, an inverter 17 as a gate control input circuit of the drive amplifier 18, and an OR gate 1.
In addition to 6, the voltage setting resistors R1 to R7 are provided.
【００１９】これら各構成部品中、充電開始電圧検出回
路６と、ＡＮＤゲート１３，ＮＯＲゲート１４，＃１遅
延回路８，ＯＲゲート１６，インバータ１７，ドライブ
用増幅器１８，トランジスタ１９，抵抗Ｒ５，Ｒ６，Ｒ
７および電源回路２が充電手段を構成する。Among these components, the charge start voltage detection circuit 6, the AND gate 13, the NOR gate 14, the # 1 delay circuit 8, the OR gate 16, the inverter 17, the drive amplifier 18, the transistor 19, the resistors R5 and R6. , R
7 and the power supply circuit 2 constitute charging means.
【００２０】また、満充電検出回路５，ＲＳフリップフ
ロップ１０，ＯＲゲート１５，＃１遅延回路８，ＯＲゲ
ート１６，インバータ１７が充電停止手段を構成する。Further, the full charge detection circuit 5, the RS flip-flop 10, the OR gate 15, the # 1 delay circuit 8, the OR gate 16 and the inverter 17 constitute a charge stopping means.
【００２１】また、電圧低下検出回路７，ＡＮＤゲート
１３，ＯＲゲート１５，ＮＯＲゲート１４，＃１遅延回
路８，ＯＲゲート１６，インバータ１７，ドライブ用増
幅器１８およびトランジスタ１９が電圧低下監視手段を
構成する。Further, the voltage drop detection circuit 7, the AND gate 13, the OR gate 15, the NOR gate 14, the # 1 delay circuit 8, the OR gate 16, the inverter 17, the drive amplifier 18 and the transistor 19 constitute a voltage drop monitoring means. To do.
【００２２】また、電圧低下検出回路７，ＡＮＤゲート
１３，ＲＳフリップフロップ１０，１２，＃２遅延回路
１１，ＯＲゲート１６，インバータ１７，ドライブ用増
幅器１８およびトランジスタ１９が異常判定手段を構成
する。Further, the voltage drop detecting circuit 7, the AND gate 13, the RS flip-flops 10 and 12, the # 2 delay circuit 11, the OR gate 16, the inverter 17, the drive amplifier 18 and the transistor 19 constitute an abnormality judging means.
【００２３】次に、図１の第１の実施例の動作について
説明する。図１に示す第１の実施例は、前述した如く、
二次電池をバックアップ用電源として用いた場合の充電
回路を例としている。また、図３（ａ），（ｂ）はそれ
ぞれ、二次電池の充電特性（ａ）および放電特性（ｂ）
の一例を示し、図３中の点Ａ，Ｂ，Ｃは二次電池１の電
圧値の検出点である。なお、図３（ｂ）にはコンデンサ
の放電特性を併記して示している。Next, the operation of the first embodiment shown in FIG. 1 will be described. As described above, the first embodiment shown in FIG.
A charging circuit using a secondary battery as a backup power source is taken as an example. 3 (a) and 3 (b) are charge characteristics (a) and discharge characteristics (b) of the secondary battery, respectively.
An example is shown, and points A, B, and C in FIG. 3 are detection points of the voltage value of the secondary battery 1. Note that FIG. 3B also shows the discharge characteristics of the capacitor.
【００２４】リチウムやニッケルカドミウム電池のよう
な二次電池は、電気エネルギーを化学エネルギーに変換
し貯蔵する方法で、充放電の際に電解質から発生するガ
スや熱が発生し、そのはたらきによって充放電を繰り返
すうちに充放電容量が低下し二次電池の寿命となる。A secondary battery such as a lithium or nickel-cadmium battery is a method of converting electric energy into chemical energy and storing it. Gas and heat generated from an electrolyte are generated during charge and discharge, and the charge and discharge are caused by the action. The charging / discharging capacity decreases with the repetition of, and the life of the secondary battery is reached.
【００２５】つまり、急激な充放電や、過充電や、過放
電での放置は二次電池の寿命を縮める原因となる。That is, rapid charging / discharging, overcharging, or leaving the battery unattended for overcharging may shorten the life of the secondary battery.
【００２６】このため、二次電池１はできるだけ小さな
充電電流が充電し、かつ二次電池１の電圧が低下する前
に充電するように制御されることが望ましい。Therefore, it is desirable to control the secondary battery 1 so that it is charged with the smallest possible charging current and before the voltage of the secondary battery 1 drops.
【００２７】図１の充電回路４は、二次電池１の電圧が
図３（ｂ）に示す点Ｂ以下の電圧であることを検出する
こと、つまり二次電池１が電源を供給する電子回路３の
稼働に十分な電圧の下限範囲としての設定値４．３Ｖを
示す点Ｂを充電開始電圧検出回路６で検出する。ここで
４．３Ｖは、（４．８Ｖ−１０％×４．８Ｖ）による概
似値として示される値である。The charging circuit 4 of FIG. 1 detects that the voltage of the secondary battery 1 is a voltage below the point B shown in FIG. 3B, that is, an electronic circuit for supplying power from the secondary battery 1. The charging start voltage detection circuit 6 detects a point B indicating a set value of 4.3 V as a lower limit range of a voltage sufficient for the operation of No. 3. Here, 4.3V is a value indicated as an approximate value by (4.8V-10% × 4.8V).
【００２８】次に、ＲＳフリップフロップ１０をリセッ
トするとともに、＃１遅延回路８をリセットして、ＯＲ
ゲート１６，イバータ１７を介して充電用ゲート機能と
して存在するトランジスタ１９のドライブ用増幅器１８
のゲート（Ｇ）をオンとしてドライブ用増幅器１８の出
力を可動状態にする。Next, the RS flip-flop 10 is reset and the # 1 delay circuit 8 is reset to OR.
Drive amplifier 18 of transistor 19 existing as a gate function for charging via gate 16 and inverter 17
The gate (G) is turned on to make the output of the drive amplifier 18 movable.
【００２９】ドライブ用増幅器１８の出力によりトラン
ジスタ１９をオンとし、電源回路２の出力する充電電流
を抵抗Ｒ５を介しトランジスタ１９経由で二次電池１に
供給して充電を行う。この充電電流は、抵抗Ｒ５の出力
をドライブ用増幅器１８の負帰還入力とし、ドライブ用
増幅器１８の出力でトランジスタ１９のベース電流を制
御することにより、トランジスタ１９に流れるコレクタ
電流、すなわち二次電池１の充電電流を定電流に制御す
る。The transistor 19 is turned on by the output of the drive amplifier 18, and the charging current output from the power supply circuit 2 is supplied to the secondary battery 1 via the resistor R5 and the transistor 19 to perform charging. This charging current uses the output of the resistor R5 as the negative feedback input of the drive amplifier 18 and controls the base current of the transistor 19 by the output of the drive amplifier 18, whereby the collector current flowing in the transistor 19, that is, the secondary battery 1 The charging current of is controlled to a constant current.
【００３０】この定電流制御により、充電開始時におい
て電源回路２の出力電圧と二次電池１の電位差で生じる
充電電流の突入電流を抑制でき、緩やかな充電が行わ
れ、二次電池１に与へるストレスの大幅な軽減が図れ
る。By this constant current control, it is possible to suppress the inrush current of the charging current caused by the potential difference between the output voltage of the power supply circuit 2 and the secondary battery 1 at the start of charging, so that the gentle charging is performed and the secondary battery 1 is given. It is possible to significantly reduce fatigue.
【００３１】充電により二次電池１の電圧が昇圧し、満
充電検出回路５によってその電圧が図３（ａ）に示す点
Ａの４．５Ｖに達すると二次電池１が充電され、二次電
池１の容量を満しつつあることを点Ａの電圧の検出によ
り判断する。The voltage of the secondary battery 1 is boosted by charging, and when the full charge detection circuit 5 reaches the voltage of 4.5 V at point A shown in FIG. 3A, the secondary battery 1 is charged and the secondary battery is charged. It is determined by detecting the voltage at the point A that the capacity of the battery 1 is being filled.
【００３２】この検出でＲＳフリップフロップ１０がセ
ットされ、ＯＲゲート１５を介して＃１遅延回路８６の
遅延動作を開始する。この遅延動作による遅延時間によ
り、二次電池１が十分に充電されて容量を満すととも
に、一方で二次電池１が過放電になることを防いでい
る。Upon this detection, the RS flip-flop 10 is set, and the delay operation of the # 1 delay circuit 86 is started via the OR gate 15. Due to the delay time due to this delay operation, the secondary battery 1 is sufficiently charged to fill the capacity, and on the other hand, the secondary battery 1 is prevented from being over-discharged.
【００３３】＃１遅延回路８の設定遅延時間に達する
と、＃１遅延回路８はＯＲゲート１６およびインバータ
１７を介してドライブ用増幅器１８のゲートをオフと制
御し、ドライブ用増幅器１８の出力をオフとする。ドラ
イブ用増幅器１８の出力オフにより、ゲート機能のトラ
ンジスタ１９はオフとなり、二次電池１の充電は停止さ
れ充電が完了する。When the set delay time of the # 1 delay circuit 8 is reached, the # 1 delay circuit 8 controls the gate of the drive amplifier 18 to be off via the OR gate 16 and the inverter 17, and the output of the drive amplifier 18 is output. Turn off. When the output of the drive amplifier 18 is turned off, the transistor 19 having a gate function is turned off, the charging of the secondary battery 1 is stopped, and the charging is completed.
【００３４】さて、充電開始電圧検出回路６で、図３
（ｂ）の点Ｂの電圧を検出し、＃１遅延回路８をリセッ
トし、二次電池１の充電を開始するに際して、さらにＲ
Ｓフリップフロップ１２をセットした後＃２遅延回路１
１を動作させ、この遅延時間内に二次電池１の障害など
で二次電池１の電圧が図３（ａ）の点Ａに昇圧しない場
合は二次電池１の異常と判断し、ドライブ用増幅器１８
のゲートを閉じることによりトランジスタ１９をオフと
して充電を停止し、図示しない警報を出力する。Now, in the charging start voltage detection circuit 6, as shown in FIG.
When the voltage at point B in (b) is detected, the # 1 delay circuit 8 is reset, and charging of the secondary battery 1 is started, R
After setting the S flip-flop 12, # 2 delay circuit 1
1 is operated, and if the voltage of the secondary battery 1 does not rise to point A in FIG. 3 (a) due to a failure of the secondary battery 1 within this delay time, it is determined that the secondary battery 1 is abnormal and drive Amplifier 18
By closing the gate of the transistor, the transistor 19 is turned off to stop charging and output an alarm (not shown).
【００３５】また同様に、二次電池１の障害の監視機能
として、電圧低下検出回路７により二次電池１の電圧の
低下を検出している。Similarly, as a function of monitoring the failure of the secondary battery 1, the voltage drop detection circuit 7 detects the voltage drop of the secondary battery 1.
【００３６】電圧低下検出回路７の検出によって、即時
充電を開始するとともに、一方では時間内に昇圧しない
場合は前述と同様に二次電池１が障害であると判断し、
ゲート機能のトランジスタ１９をオフに制御し、二次電
池１の充電を停止する。Upon detection of the voltage drop detection circuit 7, the immediate charging is started, and on the other hand, when the voltage is not boosted within the time, it is judged that the secondary battery 1 has a failure as described above.
The transistor 19 having the gate function is controlled to be turned off, and the charging of the secondary battery 1 is stopped.
【００３７】このようにして、二次電池１の運用状態を
改善しサイクル寿命と信頼性を高めることができる。In this way, the operating state of the secondary battery 1 can be improved and the cycle life and reliability can be increased.
【００３８】なお、図１においては、電源回路２の出力
に並列に二次電池１とその充電回路４を設置し、負荷側
の電子回路３へ電源を供給することによって、電源回路
２を含めた電源障害に対応し、バックアップ用電源とし
て二次電池１を用いることができる。In FIG. 1, the secondary battery 1 and its charging circuit 4 are installed in parallel with the output of the power supply circuit 2, and the power supply circuit 2 is included by supplying power to the load side electronic circuit 3. The secondary battery 1 can be used as a backup power source in response to the power failure.
【００３９】図２は、本発明の第２の実施例を示すブロ
ック図である。FIG. 2 is a block diagram showing a second embodiment of the present invention.
【００４０】図２は、電源回路２と充電回路４とを含む
電源側３５と、二次電池１と負荷とする電子回路３とを
含む負荷側３６を備え、電源側３５と負荷側３６はプラ
グ，レセプタクルにより互いに分離可能な構成とし、か
つ負荷側３６は携帯用電子機器としての構成を有する。
図２（ａ）は電源側３５の負荷側３６が一体化した状
態，また図２（ｂ）は電源側３５と負荷側３６を分離し
た状態を示す。このような構成とすることにより、電源
側３５と負荷側３６の接続時は、電子回路３は必要とす
る電源を電源回路２から受け、二次電池１は充電回路４
により充電される。FIG. 2 includes a power supply side 35 including a power supply circuit 2 and a charging circuit 4, and a load side 36 including a secondary battery 1 and an electronic circuit 3 serving as a load. The power supply side 35 and the load side 36 are The load side 36 has a structure as a portable electronic device and can be separated from each other by a plug and a receptacle.
2A shows a state in which the load side 36 of the power source side 35 is integrated, and FIG. 2B shows a state in which the power source side 35 and the load side 36 are separated. With such a configuration, when the power source side 35 and the load side 36 are connected, the electronic circuit 3 receives the required power source from the power source circuit 2 and the secondary battery 1 receives the charging circuit 4
Is charged by.
【００４１】また、負荷側３６を携帯用電子機器として
用いるときには、図２（ｂ）の如く電子回路３は二次電
池１から電源を受けて動作する。When the load side 36 is used as a portable electronic device, the electronic circuit 3 receives power from the secondary battery 1 and operates as shown in FIG.
【００４２】[0042]
【発明の効果】以上説明したように本発明は、二次電池
の過充電や過放電を防止する方法を高じ、充電電流を定
電流制御することによって二次電池の寿命と信頼性を著
しく高めることができる効果を有する。As described above, according to the present invention, the method for preventing overcharge and overdischarge of a secondary battery is enhanced, and the charging current is controlled to a constant current to remarkably enhance the life and reliability of the secondary battery. Has the effect of being able to.
【００４３】また本発明の充電回路を有した二次電池を
電子機器に内蔵することによって、主供給電源の障害時
のバックアップ用として長時間の使用に耐えうることが
出来、電子機器の信頼性を高める効果を有する。Further, by incorporating the secondary battery having the charging circuit of the present invention into an electronic device, it can be used for a long time as a backup in case of a failure of the main power supply, and the reliability of the electronic device is improved. Has the effect of increasing.
【００４４】さらに、携帯用電子機器用として、電子機
器の携帯時には、本発明の充電回路を備えた電源回路を
切り離して二次電池を電源として使用し、電子機器と電
源回路の接続時にあっては電子機器が電源回路から電源
の供給を受けて使用することができるとともに、これと
並行して二次電池に本発明の充電回路によって充電を施
すことができ、使用者をして二次電池の充電作業から開
放することができる効果を有する。Further, for portable electronic equipment, when the electronic equipment is carried, the power supply circuit provided with the charging circuit of the present invention is disconnected and the secondary battery is used as the power supply. The electronic device can be used by being supplied with power from the power supply circuit, and at the same time, the secondary battery can be charged by the charging circuit of the present invention. It has the effect that it can be released from the charging work.
【図１】本発明の第一の実施例の構成を示す回路図であ
る。FIG. 1 is a circuit diagram showing a configuration of a first exemplary embodiment of the present invention.
【図２】本発明の第二の実施例の構成を示すブロック図
である。FIG. 2 is a block diagram showing a configuration of a second exemplary embodiment of the present invention.
【図３】図１の二次電池１の充放電特性の一例を示す図
である。3 is a diagram showing an example of charge / discharge characteristics of the secondary battery 1 of FIG.
【図４】従来の充電回路の構成を示すブロック図であ
る。FIG. 4 is a block diagram showing a configuration of a conventional charging circuit.
【図５】従来の電子回路の第一の電源例を示す図であ
る。FIG. 5 is a diagram showing a first power supply example of a conventional electronic circuit.
【図６】従来の電子回路の第二の電源例を示す図であ
る。FIG. 6 is a diagram showing a second power supply example of a conventional electronic circuit.
１ 二次電池 ２ 電源回路 ３ 電子回路 ４ 充電回路 ５ 満充電検出回路 ６ 充電開始電圧検出回路 ７ 電圧低下検出回路 ８ ＃１遅延回路 ９ ＃２遅延回路 １０，１２ ＲＳフリップフロップ １３ ＡＮＤゲート １４ ＮＯＲゲート １５，１６ ＯＲゲート １７ インバータ １８ ドライブ用増幅器 １９ トランジスタ ２１ 満充電検出回路 ２２ 遅延回路 ２３ インバータ ２４ トランジスタ ３１ 電子回路 ３２ メモリ回路 ３５ 電子側 ３６ 負荷側 1 Secondary Battery 2 Power Supply Circuit 3 Electronic Circuit 4 Charging Circuit 5 Full Charge Detection Circuit 6 Charging Start Voltage Detection Circuit 7 Voltage Drop Detection Circuit 8 # 1 Delay Circuit 9 # 2 Delay Circuit 10, 12 RS Flip Flop 13 AND Gate 14 NOR Gate 15, 16 OR gate 17 Inverter 18 Drive amplifier 19 Transistor 21 Full charge detection circuit 22 Delay circuit 23 Inverter 24 Transistor 31 Electronic circuit 32 Memory circuit 35 Electronic side 36 Load side
Claims (3)
の定電流による充電を施す充電手段と、前記充電手段に
よって昇圧した二次電池の端子電圧が所定の満充電レベ
ルに達した場合にこれを検出し、過充電抑圧のために設
定した所定の時間経過後に前記充電手段による充電を停
止させる充電停止手段と、前記充電手段による充電開始
後、所定の時間経過するも二次電池の端子電圧が前記所
定の満充電レベルに達しない場合に二次電池の異常と判
定して充電を停止させる異常判定手段と、二次電池が所
定の定電圧まで低下したときにこれを検出し、前記充電
手段によって即時充電を行なうとともに、前記異常判定
手段による二次電池の異常判定ならびに充電の停止を併
せ実行する電圧低下監視手段とを備えて成ることを特徴
とする二次電池の充電回路。1. A charging means for detecting a charging start voltage of a secondary battery and charging the battery with a predetermined constant current; and a terminal voltage of the secondary battery boosted by the charging means reaches a predetermined full charge level. Is detected, the charging stop means for stopping the charging by the charging means after a predetermined time set for overcharge suppression, and after the start of charging by the charging means, a predetermined time has elapsed When the terminal voltage does not reach the predetermined full charge level, an abnormality determination unit that determines that the secondary battery is abnormal and stops charging, and detects this when the secondary battery drops to a predetermined constant voltage, The secondary battery charging means further comprises: a voltage drop monitoring means for performing the instant charging by the charging means, and at the same time executing the abnormality judgment of the secondary battery by the abnormality judging means and the stop of the charging. Electric circuit.
共通な電源回路を設け、前記充電回路と前記二次電池を
前記電源回路と前記負荷の電子回路間に前記電源回路の
出力と並行に接続し、供給電源を含む前記電源回路に障
害を有するときには前記電子回路に前記二次電池をバッ
クアップ用電源として電源を供給するものとして運用す
ることを特徴とする請求項１記載の二次電池の充電回
路。2. A power supply circuit common to the electronic circuit of the load and the charging circuit is provided, and the charging circuit and the secondary battery are connected between the power supply circuit and the electronic circuit of the load in parallel with the output of the power supply circuit. 2. The charging of the secondary battery according to claim 1, wherein when the power supply circuit including the power supply has a failure, the secondary battery is operated as a power supply for the electronic circuit by using the secondary battery as a backup power supply. circuit.
側と、前記二次電池と前記電子回路を含む負荷側とに着
脱自由に分離構成して運用することを特徴とする請求項
１記載の二次電池の充電回路。3. The power source side including the charging circuit and the power source circuit, and the load side including the secondary battery and the electronic circuit are detachably detachably configured to operate. Secondary battery charging circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24226091A JP2677072B2 (en) | 1991-09-24 | 1991-09-24 | Rechargeable battery charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24226091A JP2677072B2 (en) | 1991-09-24 | 1991-09-24 | Rechargeable battery charging circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0591679A true JPH0591679A (en) | 1993-04-09 |
| JP2677072B2 JP2677072B2 (en) | 1997-11-17 |
Family
ID=17086626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24226091A Expired - Fee Related JP2677072B2 (en) | 1991-09-24 | 1991-09-24 | Rechargeable battery charging circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2677072B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100328888B1 (en) * | 1997-02-14 | 2002-05-09 | 핫토리 쥰이치 | Charge and discharge control circuit |
-
1991
- 1991-09-24 JP JP24226091A patent/JP2677072B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100328888B1 (en) * | 1997-02-14 | 2002-05-09 | 핫토리 쥰이치 | Charge and discharge control circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2677072B2 (en) | 1997-11-17 |
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