JP2000354335A - Protection circuit for series-connected batteries and battery pack provided with the protection circuit and back-up power supply - Google Patents
Protection circuit for series-connected batteries and battery pack provided with the protection circuit and back-up power supplyInfo
- Publication number
- JP2000354335A JP2000354335A JP11163510A JP16351099A JP2000354335A JP 2000354335 A JP2000354335 A JP 2000354335A JP 11163510 A JP11163510 A JP 11163510A JP 16351099 A JP16351099 A JP 16351099A JP 2000354335 A JP2000354335 A JP 2000354335A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- battery
- series
- power supply
- 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
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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Tests Of Electric Status Of Batteries (AREA)
- Protection Of Static Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、複数個の電池を直
列に接続したシリーズ接続電池用の保護回路及び該保護
回路を備えた電池パック並びにバックアップ電源装置に
関する。The present invention relates to a protection circuit for a series-connected battery in which a plurality of batteries are connected in series, a battery pack having the protection circuit, and a backup power supply.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】一般に
携帯電話やノートパソコン、プレーヤー、デジタルカメ
ラなどの携帯型電子機器には、電源として充電式の複数
のセルを内蔵した電池パックが用いられている。特に携
帯型電子機器においては、通常の商用電源を使用する機
器とは異なり、確実な動作を保証するためには十分な容
量の電池電源が必要である。そのため、電池電源の残容
量を把握して適宜充電することが必要である。しかし、
繰り返し充放電する電池では、充放電の際に過充電、過
放電にならないようにしないと、電池の寿命を低下させ
てしまうだけでなく、電池そのものを壊してしまい電子
機器が作動不能になってしまうという問題がある。2. Description of the Related Art In general, portable electronic devices such as mobile phones, notebook computers, players, digital cameras and the like use a battery pack containing a plurality of rechargeable cells as a power source. I have. In particular, in portable electronic devices, unlike devices that use a normal commercial power supply, a battery power source having a sufficient capacity is required to guarantee reliable operation. For this reason, it is necessary to grasp the remaining capacity of the battery power supply and appropriately charge the battery. But,
If a battery is repeatedly charged and discharged, if it is not overcharged or overdischarged during charging and discharging, not only will the life of the battery be shortened, but also the battery itself will be damaged and the electronic equipment will not be able to operate. Problem.
【０００３】[0003]
【課題を解決するための手段】本発明は、上記課題を解
決するものであって、シリーズ接続電池を過充電、過放
電から保護し、電源のバックアップを行うものである。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is intended to protect a series-connected battery from overcharge and overdischarge, and to back up a power supply.
【０００４】そのために本発明は、複数個の電池を直列
に接続したシリーズ接続電池用の保護回路及び該回路を
備えた電池パックとして、前記各電池が過充電電圧を上
回ったか過放電電圧を下回ったか電圧を監視する複数の
電圧監視回路と、前記各電池の充電電流をバイパスする
バイパス回路を有し、前記電圧監視回路による電圧の監
視により過充電電圧を上回ったとき第１のスイッチング
素子をオンにして前記バイパス回路を動作させる複数の
過充電保護回路と、前記電圧監視回路による電圧の監視
により過放電電圧を下回ったとき第２のスイッチング素
子をオンにする複数の過放電保護回路とを備え、前記複
数の過充電保護回路のすべての第１のスイッチング素子
がオンになったことを条件に充電を停止させ、前記複数
の過放電保護回路のいずれかの第２のスイッチング素子
がオンになったことを条件に放電を停止させることを特
徴とし、前記過充電保護回路は、前記各バイパス回路が
動作したときにそれぞれ信号を発信する素子を挿入し、
該全ての信号が得られたときに充電停止信号を送出し、
前記信号は発信する素子は、フォトカプラであり、該フ
ォトカプラの受光側素子を直列に接続して充電停止信号
を送出し、第２のスイッチング素子のオン信号をオア接
続して放電停止信号を送出することを特徴とするもので
ある。Accordingly, the present invention provides a protection circuit for a series-connected battery in which a plurality of batteries are connected in series, and a battery pack provided with the circuit, wherein each of the batteries exceeds the overcharge voltage or falls below the overdischarge voltage. A plurality of voltage monitoring circuits for monitoring the battery voltage, and a bypass circuit for bypassing the charging current of each of the batteries, and the first switching element is turned on when an overcharge voltage is exceeded by monitoring the voltage by the voltage monitoring circuit. A plurality of overcharge protection circuits for operating the bypass circuit, and a plurality of overdischarge protection circuits for turning on a second switching element when the voltage drops below an overdischarge voltage by monitoring the voltage by the voltage monitoring circuit. Stopping charging on condition that all the first switching elements of the plurality of overcharge protection circuits are turned on, the plurality of overcharge protection circuits Discharging is stopped on condition that any one of the second switching elements is turned on, and the overcharge protection circuit includes an element that transmits a signal when each of the bypass circuits operates. And
Send a charge stop signal when all the signals are obtained,
The element that transmits the signal is a photocoupler, a charge stop signal is transmitted by connecting the light receiving side elements of the photocoupler in series, and an ON signal of the second switching element is OR-connected to generate a discharge stop signal. It is characterized by being transmitted.
【０００５】また、バックアップ電源装置として、前記
各電池が過充電電圧を上回ったか過放電電圧を下回った
か電圧を監視する複数の電圧監視回路と、前記各電池の
充電電流をバイパスするバイパス回路を有し、前記電圧
監視回路による電圧の監視により過充電電圧を上回った
とき第１のスイッチング素子をオンにして前記バイパス
回路を動作させる複数の過充電保護回路と、前記電圧監
視回路による電圧の監視により過放電電圧を下回ったと
き第２のスイッチング素子をオンにする複数の過放電保
護回路と、前記直列に接続した複数個の電池の充放電を
制御し、複数の過充電保護回路のすべての第１のスイッ
チング素子がオンになったことを条件に充電を停止さ
せ、前記複数の過放電保護回路のいずれかの第２のスイ
ッチング素子がオンになったことを条件に放電を停止さ
せる充放電制御回路とからなる電池パック、並びに交流
を直流に変換し前記電池パックを充電する電源と、前記
電池パックの出力を定電圧に調整して出力する電圧変換
回路とを有し、前記バックアップ電源装置に使用する電
池は、リチウムイオン電池であり、前記電源は、商用電
源に接続されるＡＣ／ＤＣコンバータであることを特徴
とするものである。Further, the backup power supply device includes a plurality of voltage monitoring circuits for monitoring whether each of the batteries is higher than the overcharge voltage or lower than the overdischarge voltage, and a bypass circuit for bypassing a charging current of each of the batteries. A plurality of overcharge protection circuits that turn on a first switching element to operate the bypass circuit when the voltage exceeds an overcharge voltage by monitoring the voltage by the voltage monitoring circuit, and that the voltage monitoring circuit monitors the voltage. A plurality of over-discharge protection circuits for turning on the second switching element when the voltage drops below the over-discharge voltage, and controlling charging and discharging of the plurality of batteries connected in series; The charging is stopped on condition that one switching element is turned on, and the second switching element of any of the plurality of overdischarge protection circuits is turned on. A battery pack comprising a charge / discharge control circuit that stops discharging on the condition that the battery pack has become available, a power supply that converts alternating current into direct current and charges the battery pack, and adjusts and outputs the output of the battery pack to a constant voltage. And a battery used in the backup power supply device is a lithium ion battery, and the power supply is an AC / DC converter connected to a commercial power supply.
【０００６】[0006]
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照しつつ説明する。図１はシリーズ接続電池用保護
回路を備えた電池パックの実施の形態を示す図であり、
１、２は整流素子、３は充放電制御用ＦＥＴ回路、１１
は電池、１２は電池電圧監視回路、１３は過充電防止用
ＦＥＴ、１４、１６は発光ダイオード、１５は光トラン
ジスタ、１７は過放電防止用ＦＥＴ、１８はゲート用ダ
イオード、Ｒ１〜Ｒ３は抵抗を示す。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a battery pack provided with a protection circuit for series-connected batteries,
1, 2 are rectifying elements, 3 is a charge / discharge control FET circuit, 11
Is a battery, 12 is a battery voltage monitoring circuit, 13 is an overcharge prevention FET, 14 and 16 are light emitting diodes, 15 is an optical transistor, 17 is an overdischarge prevention FET, 18 is a gate diode, and R1 to R3 are resistors. Show.
【０００７】図１において、整流素子１は、充電回路に
おける逆流防止用のダイオードであり、整流素子２は、
放電回路における逆流防止用のダイオードである。電池
１１は、Ｎ個を直列接続（Ｎ直）してシリーズ化し、整
流素子１を通して充電電源回路に、また、整流素子２を
通して電子機器の負荷に給電する、例えばＤＣ／ＤＣコ
ンバータにそれぞれ接続し、一方、充放電制御用ＦＥＴ
回路３に接続して充放電制御用ＦＥＴ回路３により充放
電を制御するように構成したものである。電池電圧監視
回路１２は、各電池１１に並列に接続して電圧を監視
（モニタ）するものであり、電池電圧が充電時に過充電
電圧（例えば４．３±０．０５Ｖ）を上回ったか、放電
時に過放電電圧（例えば２．５±０．０６３Ｖ）を下回
ったかを検出してそれぞれ判定信号をＵＶ、ＬＶの端子
より出力する。In FIG. 1, a rectifying element 1 is a diode for preventing backflow in a charging circuit, and a rectifying element 2 is
This is a diode for preventing backflow in the discharge circuit. The batteries 11 are connected in series to each other by connecting N batteries in series (N series) and connected to a charging power supply circuit through the rectifying element 1 and to a DC / DC converter, for example, which supplies power to a load of an electronic device through the rectifying element 2. On the other hand, a charge / discharge control FET
It is configured to be connected to the circuit 3 and to control charging and discharging by the charging and discharging control FET circuit 3. The battery voltage monitoring circuit 12 is connected in parallel with each battery 11 to monitor (monitor) the voltage. When the battery voltage exceeds the overcharge voltage (for example, 4.3 ± 0.05 V) during charging, the battery voltage monitoring circuit 12 discharges the battery. At this time, it is detected whether the voltage is lower than an overdischarge voltage (for example, 2.5 ± 0.063 V), and a determination signal is output from the UV and LV terminals, respectively.
【０００８】過充電防止用ＦＥＴ１３は、電池電圧監視
回路１２において電池１１の電圧が充電時に過充電電圧
を上回ったときの判定信号をＵＶ端子からゲートに入力
してオンするものであり、発光ダイオード１４と抵抗Ｒ
１に直列接続され、それらの直列回路が各電池１１毎に
並列接続されてバイパス回路を構成している。つまり、
電池１１の電圧が充電時に過充電電圧を上回ったとき
（満充電となったとき）、過充電防止用ＦＥＴ１３がオ
ンになり、抵抗Ｒ１を負荷として充電電流をバイパスす
ることにより、その電池１１の過充電を防止しながら他
の電池へ充電電流を供給し続ける。このとき、フォトカ
プラを構成する発光ダイオード１４と光トランジスタ１
５において発光ダイオード１４が発光するので、光トラ
ンジスタ１５がオンになる。各電池１１に対応して設け
られる光トランジスタ１５は、発光ダイオード１６、抵
抗Ｒ３に直列接続され、充放電制御用ＦＥＴ回路３に充
電停止信号を与える回路となっている。したがって、発
光ダイオード１６は、すべての電池１１が過充電電圧に
達したとき、つまり充電が完了したとき点灯する。The overcharge prevention FET 13 is turned on by inputting a determination signal from the UV terminal to the gate when the voltage of the battery 11 exceeds the overcharge voltage at the time of charging in the battery voltage monitoring circuit 12. 14 and resistance R
1 in series, and these series circuits are connected in parallel for each battery 11 to form a bypass circuit. That is,
When the voltage of the battery 11 exceeds the overcharge voltage at the time of charging (when the battery 11 is fully charged), the overcharge prevention FET 13 is turned on, and the charging current is bypassed with the resistor R1 as a load. Continue supplying charging current to other batteries while preventing overcharging. At this time, the light emitting diode 14 and the phototransistor 1 constituting the photocoupler
5, the light emitting diode 14 emits light, so that the optical transistor 15 is turned on. An optical transistor 15 provided for each battery 11 is connected in series to the light emitting diode 16 and the resistor R3, and serves as a circuit for providing a charge stop signal to the charge / discharge control FET circuit 3. Therefore, the light emitting diode 16 is turned on when all the batteries 11 reach the overcharge voltage, that is, when the charging is completed.
【０００９】過放電防止用ＦＥＴ１７は、電池電圧監視
回路１２において電池１１の電圧が放電時の過放電電圧
を下回ったときの判定信号をＬＶ端子からゲート端子に
入力してオンするものであり、それぞれ抵抗Ｒ２とゲー
ト用ダイオード１８に直列接続される。そして、各ゲー
ト用ダイオード１８を共通接続して充放電制御用ＦＥＴ
回路３に放電停止信号を与える回路となっている。つま
り、ゲート用ダイオード１８が充放電制御用ＦＥＴ回路
３の放電停止信号端子に対し論理オア接続され、放電時
において、いずれかの電池１１の電圧が過放電電圧を下
回ると、充放電制御用ＦＥＴ回路３に放電停止信号が与
えられる。The over-discharge prevention FET 17 turns on the battery voltage monitoring circuit 12 by inputting a determination signal when the voltage of the battery 11 falls below the over-discharge voltage at the time of discharging from the LV terminal to the gate terminal. Each is connected in series to the resistor R2 and the gate diode 18. Then, the gate diodes 18 are commonly connected to each other to control the charge / discharge control FET.
The circuit 3 supplies a discharge stop signal to the circuit 3. That is, the gate diode 18 is logically OR-connected to the discharge stop signal terminal of the charge / discharge control FET circuit 3, and at the time of discharging, when the voltage of any of the batteries 11 falls below the overdischarge voltage, the charge / discharge control FET Circuit 3 is supplied with a discharge stop signal.
【００１０】したがって、充電時においては、各電池１
１の電圧が過充電電圧を上回るごとに順次過充電防止用
ＦＥＴ１３がオンになることにより光トランジスタ１５
がオンになり、すべての電池１１の電圧が過充電電圧を
上回ったときに、すべての光トランジスタ１５がオンに
なって、充放電制御用ＦＥＴ回路３に充電停止信号を与
える。このとき充放電制御用ＦＥＴ回路３によってすべ
ての充電を停止する。これに対し、放電時においては、
いずれかの電池１１の電圧が過放電電圧を下回った時点
で、充放電制御用ＦＥＴ回路３によってすべての放電を
停止する。Therefore, at the time of charging, each battery 1
The overcharge prevention FET 13 is sequentially turned on every time the voltage of the first transistor 1 exceeds the overcharge voltage.
Is turned on, and when the voltages of all the batteries 11 exceed the overcharge voltage, all the phototransistors 15 are turned on to supply a charge stop signal to the charge / discharge control FET circuit 3. At this time, all charging is stopped by the charge / discharge control FET circuit 3. In contrast, during discharge,
When the voltage of any one of the batteries 11 falls below the overdischarge voltage, the charge / discharge control FET circuit 3 stops all discharge.
【００１１】以上のように本発明に係るシリーズ接続電
池用保護回路を備えた電池パックでは、シリーズ化した
電池１１毎に電圧監視機能、過充電保護機能、過放電保
護機能を内臓して、構成電池すべての充放電を制御す
る。なお、シリーズ数は原則として無制限であるが、ス
イッチング素子耐圧等に準じる。また、逆流防止用のダ
イオードで構成する入出力の逆流防止機能を内蔵してい
る。As described above, in the battery pack provided with the protection circuit for series-connected batteries according to the present invention, a voltage monitoring function, an overcharge protection function, and an overdischarge protection function are built in for each series of batteries 11. Controls charging and discharging of all batteries. Although the number of series is not limited in principle, it depends on the withstand voltage of the switching element. It also has a built-in input / output backflow prevention function consisting of a backflow prevention diode.
【００１２】過充電保護機能では、各電池毎に電圧を監
視し、例えば４．３±０．０５Ｖに電池電圧が上昇する
と、各保護素子毎に内蔵するバイパス回路を経由して他
の電池へ充電電流をバイパスし、構成上の全電池電圧が
過充電検知電圧を上回ったときに構成電池のすべての充
電を停止する。過放電保護機能では、各電池毎に電圧を
監視し、例えば２．５±０．０６３Ｖにいずれかの電池
電圧が下降すると、構成電池すべての放電を停止する。In the overcharge protection function, the voltage is monitored for each battery, and when the battery voltage rises to, for example, 4.3 ± 0.05 V, the battery is connected to another battery via a built-in bypass circuit for each protection element. The charging current is bypassed, and all charging of the constituent batteries is stopped when all the constituent battery voltages exceed the overcharge detection voltage. In the overdischarge protection function, the voltage is monitored for each battery, and when any one of the battery voltages falls to, for example, 2.5 ± 0.063 V, discharging of all the constituent batteries is stopped.
【００１３】図２は本発明に係るシリーズ接続電池用保
護回路を備えた電池パックによるバックアップ電源装置
の実施の形態を示す図であり、２１はプラグ、２２はＡ
Ｃ／ＤＣコンバータ、２３はシリーズ接続電池用保護回
路を備えた電池パック、２４はＤＣ／ＤＣコンバータ、
２５は出力負荷端子、２６はダイオード、２７は電源ス
イッチ、２８、２９は表示ランプを示す。FIG. 2 is a view showing an embodiment of a backup power supply device using a battery pack provided with a protection circuit for series-connected batteries according to the present invention.
C / DC converter, 23 is a battery pack provided with a protection circuit for series-connected batteries, 24 is a DC / DC converter,
25 is an output load terminal, 26 is a diode, 27 is a power switch, and 28 and 29 are display lamps.
【００１４】図２において、プラグ２１は、ＡＣ１００
Ｖの商用電源のコンセントに接続するプラグであり、Ａ
Ｃ／ＤＣコンバータ２２は、交流を直流に変換し出力す
る電源である。電池パック２３は、図１に示すような複
数個の電池を直列に接続したシリーズ接続電池の保護回
路を備え、各電池が過充電電圧を上回ったか過放電電圧
を下回ったか電圧を監視し、各電池が過充電電圧を上回
ったとき当該電池の充電電流をバイパスすると共にすべ
ての電池が過充電電圧を上回ったときに充電を停止さ
せ、また各電池のいずれかが過放電電圧を下回ったこと
を条件に放電を停止させるものであり、ＡＣ／ＤＣコン
バータ２２により充電される。ＤＣ／ＤＣコンバータ２
４は、ＡＣ／ＤＣコンバータ２２及び電池パック２３の
出力を定電圧、例えば２４Ｖに調整して出力するもので
ある。ダイオード２６は、ＡＣ／ＤＣコンバータ２２の
出力に直列に挿入接続し、ＡＣ１００Ｖの商用電源が停
電したり、あるいはプラグ２１が不用意に引き抜かれた
ことにより、ＡＣ／ＤＣコンバータ２２の出力がダウン
したときに、電池パック２３をバックアップ電源として
ＤＣ／ＤＣコンバータ２４に給電するものである。電源
スイッチ２７は、ＤＣ／ＤＣコンバータ２４のＡＣ／Ｄ
Ｃコンバータ２２及び電池パック２３からの給電入力回
路をオン／オフするものであり、表示ランプ２８は、電
源スイッチ２７がオンで給電状態にあることを表示す
る、例えば赤色の発光ダイオード、表示ランプ２９は、
ＡＣ／ＤＣコンバータ２２の出力が活きていることを表
示する、例えば緑色の発光ダイオードである。In FIG. 2, a plug 21 is connected to AC100.
V is a plug that connects to the outlet of commercial power
The C / DC converter 22 is a power supply that converts AC into DC and outputs the DC. The battery pack 23 includes a series-connected battery protection circuit in which a plurality of batteries are connected in series as illustrated in FIG. 1, and monitors the voltage of each battery to determine whether the voltage is higher than the overcharge voltage or lower than the overdischarge voltage. Bypasses the charging current of the battery when the battery exceeds the overcharge voltage, stops charging when all batteries exceed the overcharge voltage, and confirms that one of the batteries has dropped below the overdischarge voltage. The discharge is stopped under the condition, and the battery is charged by the AC / DC converter 22. DC / DC converter 2
Numeral 4 is for adjusting the output of the AC / DC converter 22 and the battery pack 23 to a constant voltage, for example, 24V, and outputting the adjusted voltage. The diode 26 is inserted and connected in series with the output of the AC / DC converter 22, and the output of the AC / DC converter 22 goes down due to the power failure of the AC 100V commercial power source or the careless removal of the plug 21. Sometimes, the battery pack 23 is used as a backup power supply to supply power to the DC / DC converter 24. The power switch 27 is connected to the AC / D converter of the DC / DC converter 24.
The power supply input circuit from the C converter 22 and the battery pack 23 is turned on / off. The display lamp 28 indicates that the power switch 27 is on and the power is supplied. For example, a red light emitting diode, a display lamp 29 Is
For example, a green light emitting diode that indicates that the output of the AC / DC converter 22 is active.
【００１５】バックアップ電源装置として、上記のよう
に構成することにより、電源スイッチ２７が投入され、
プラグ２１からＡＣ１００Ｖが供給されて正常に動作し
負荷に給電している状態では、赤色の表示ランプ２８、
緑色の表示ランプ２９が点灯する。そして、ＡＣ１００
ＶがダウンしてＡＣ／ＤＣコンバータ２２の出力が落ち
ると、緑色の表示ランプ２９が消える。つまり、電池パ
ック２３からのバックアップ動作状態であることを示
し、この状態で電池パック２３において、例えば数時間
のバックアップを行うが、電池パック２３の過放電保護
機能が動作して放電が停止すると、電池パック２３の出
力も落ちるので、赤色の表示ランプ２８も消える。した
がって、赤色の表示ランプ２８、緑色の表示ランプ２９
とも消えているときは、負荷に給電されていない状態を
示すことになる。By configuring the backup power supply as described above, the power switch 27 is turned on,
In a state where AC 100 V is supplied from the plug 21 to operate normally and supply power to the load, a red display lamp 28,
The green display lamp 29 lights up. And AC100
When V goes down and the output of the AC / DC converter 22 drops, the green display lamp 29 goes out. In other words, this indicates that the battery pack 23 is in a backup operation state. In this state, the battery pack 23 performs, for example, backup for several hours. However, when the overdischarge protection function of the battery pack 23 operates and discharge stops, Since the output of the battery pack 23 also drops, the red display lamp 28 also goes out. Therefore, the red display lamp 28 and the green display lamp 29
When both are off, it indicates a state where power is not supplied to the load.
【００１６】なお、本発明は、上記実施の形態に限定さ
れるものではなく、種々の変形が可能である。例えば上
記実施の形態では、電池パックにコンバータを接続する
構成を示したが、電池パックにコンバータを内蔵するも
のであってもよいことはいうまでもない。It should be noted that the present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above embodiment, the configuration in which the converter is connected to the battery pack has been described, but it goes without saying that the converter may be built in the battery pack.
【００１７】[0017]
【発明の効果】以上の説明から明らかなように、本発明
によれば、直列に接続した複数個の電池に対し、各電池
が過充電電圧を上回ったか過放電電圧を下回ったか電圧
を監視する複数の電圧監視回路と、各電池の充電電流を
バイパスするバイパス回路を有し、電圧監視回路による
電圧の監視により過充電電圧を上回ったとき第１のスイ
ッチング素子をオンにしてバイパス回路を動作させる複
数の過充電保護回路と、電圧監視回路による電圧の監視
により過放電電圧を下回ったとき第２のスイッチング素
子をオンにする複数の過放電保護回路とを備え、複数の
過充電保護回路のすべての第１のスイッチング素子がオ
ンになったことを条件に充電を停止させ、複数の過放電
保護回路のいずれかの第２のスイッチング素子がオンに
なったことを条件に放電を停止させるので、直列接続し
た電池パック（シリーズ接続電池）を過充電、過放電か
ら保護することができ、電池パックの長寿命化を図るこ
とができる。As is apparent from the above description, according to the present invention, for a plurality of batteries connected in series, the voltage of each battery is monitored to determine whether the voltage is higher than the overcharge voltage or lower than the overdischarge voltage. A plurality of voltage monitoring circuits and a bypass circuit for bypassing a charging current of each battery are provided. When the voltage monitoring circuit monitors the voltage, when the overcharge voltage is exceeded, the first switching element is turned on to operate the bypass circuit. A plurality of overcharge protection circuits, and a plurality of overdischarge protection circuits for turning on the second switching element when the voltage drops below the overdischarge voltage by monitoring the voltage by the voltage monitoring circuit. Charging is stopped on condition that the first switching element is turned on, and on condition that any second switching element of the plurality of overdischarge protection circuits is turned on. Since discharge is stopped, the battery packs connected in series (series connection battery) overcharge, can be protected from over-discharge, it is possible to extend the life of the battery pack.
【００１８】また、バックアップ電源装置として、上記
のような電池パックと、交流を直流に変換し電池パック
を充電する電源と、電池パックの出力を定電圧に調整し
て出力する電圧変換回路とを有するので、電源の数時間
のバックアップを確実に行うことができる。Further, as the backup power supply device, the above-mentioned battery pack, a power supply for converting an alternating current into a direct current and charging the battery pack, and a voltage conversion circuit for adjusting the output of the battery pack to a constant voltage and outputting the same are provided. Because of this, backup for several hours of the power supply can be reliably performed.
【図１】 シリーズ接続電池用保護回路を備えた電池パ
ックの実施の形態を示す図である。FIG. 1 is a diagram showing an embodiment of a battery pack provided with a series connection battery protection circuit.
【図２】 本発明に係るシリーズ接続電池用保護回路を
備えた電池パックによるバックアップ電源装置の実施の
形態を示す図である。FIG. 2 is a diagram showing an embodiment of a backup power supply device using a battery pack provided with a series connection battery protection circuit according to the present invention.
１…整流素子、３…充放電制御用ＦＥＴ回路、１１…電
池、１２…電池電圧監視回路、１３…過充電防止用ＦＥ
Ｔ、１４、１６…発光ダイオード、１５…光トランジス
タ、１７…過放電防止用ＦＥＴ、１８…ゲート用ダイオ
ード、Ｒ１〜Ｒ３…抵抗DESCRIPTION OF SYMBOLS 1 ... Rectifier element, 3 ... Charge / discharge control FET circuit, 11 ... Battery, 12 ... Battery voltage monitoring circuit, 13 ... FE for overcharge prevention
T, 14, 16: Light-emitting diode, 15: Phototransistor, 17: Overdischarge prevention FET, 18: Gate diode, R1 to R3: Resistance
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2G016 CA00 CB12 CB31 CC01 CC04 CC06 CD06 CD09 CD14 CE01 2G035 AA15 AA23 AB03 AC01 AC16 AD03 AD04 AD10 AD39 AD43 5G003 AA01 BA03 CA14 CC04 DA07 DA13 EA04 EA06 GA01 GA10 GB03 5H030 AA03 AA04 AS06 AS18 BB01 BB21 DD05 DD08 FF43 FF44 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 2G016 CA00 CB12 CB31 CC01 CC04 CC06 CD06 CD09 CD14 CE01 2G035 AA15 AA23 AB03 AC01 AC16 AD03 AD04 AD10 AD39 AD43 5G003 AA01 BA03 CA14 CC04 DA07 DA13 EA04 EA06 GA01 GA10 GB03 5H030 A03 A03 AS18 BB01 BB21 DD05 DD08 FF43 FF44
Claims (8)
接続電池用の保護回路であって、前記各電池が過充電電
圧を上回ったか過放電電圧を下回ったか電圧を監視する
複数の電圧監視回路と、前記各電池の充電電流をバイパ
スするバイパス回路を有し、前記電圧監視回路による電
圧の監視により過充電電圧を上回ったとき第１のスイッ
チング素子をオンにして前記バイパス回路を動作させる
複数の過充電保護回路と、前記電圧監視回路による電圧
の監視により過放電電圧を下回ったとき第２のスイッチ
ング素子をオンにする複数の過放電保護回路とを備え、
前記複数の過充電保護回路のすべての第１のスイッチン
グ素子がオンになったことを条件に充電を停止させ、前
記複数の過放電保護回路のいずれかの第２のスイッチン
グ素子がオンになったことを条件に放電を停止させるこ
とを特徴とするシリーズ接続電池用保護回路。1. A protection circuit for a series-connected battery in which a plurality of batteries are connected in series, comprising: a plurality of voltage monitoring circuits for monitoring whether each of the batteries is higher than an overcharge voltage or lower than an overdischarge voltage. And a bypass circuit for bypassing a charging current of each of the batteries, wherein a plurality of operating the bypass circuit by turning on a first switching element when an overcharge voltage is exceeded by monitoring the voltage by the voltage monitoring circuit. An overcharge protection circuit, comprising a plurality of overdischarge protection circuits for turning on a second switching element when the voltage drops below an overdischarge voltage by monitoring the voltage by the voltage monitoring circuit;
The charging was stopped on condition that all the first switching elements of the plurality of overcharge protection circuits were turned on, and the second switching element of any of the plurality of overdischarge protection circuits was turned on. A protection circuit for a series-connected battery, wherein the discharge is stopped on the condition that:
回路が動作したときにそれぞれ信号を発信する素子を挿
入し、該全ての信号が得られたときに充電停止信号を送
出することを特徴とする請求項１記載のシリーズ接続電
池用保護回路。2. The overcharge protection circuit according to claim 1, further comprising an element for transmitting a signal when each of the bypass circuits operates, and transmitting a charge stop signal when all the signals are obtained. The protection circuit for series-connected batteries according to claim 1, wherein
ラであり、該フォトカプラの受光側素子を直列に接続し
て充電停止信号を送出することを特徴とする請求項２記
載のシリーズ接続電池用保護回路。3. The series-connected battery according to claim 2, wherein the element that transmits the signal is a photocoupler, and a charge stop signal is transmitted by connecting light-receiving elements of the photocoupler in series. Protection circuit.
ング素子のオン信号をオア接続して放電停止信号を送出
することを特徴とする請求項１記載のシリーズ接続電池
用保護回路。4. The protection circuit for a series-connected battery according to claim 1, wherein the overdischarge protection circuit OR-connects an ON signal of a second switching element to transmit a discharge stop signal.
続電池用保護回路を備えた電池パックであって、前記各
電池が過充電電圧を上回ったか過放電電圧を下回ったか
電圧を監視する複数の電圧監視回路と、前記各電池の充
電電流をバイパスするバイパス回路を有し、前記電圧監
視回路による電圧の監視により過充電電圧を上回ったと
き第１のスイッチング素子をオンにして前記バイパス回
路を動作させる複数の過充電保護回路と、前記電圧監視
回路による電圧の監視により過放電電圧を下回ったとき
第２のスイッチング素子をオンにする複数の過放電保護
回路と、前記直列に接続した複数個の電池の充放電を制
御し、複数の過充電保護回路のすべての第１のスイッチ
ング素子がオンになったことを条件に充電を停止させ、
前記複数の過放電保護回路のいずれかの第２のスイッチ
ング素子がオンになったことを条件に放電を停止させる
充放電制御回路とを備えたことを特徴とするシリーズ接
続電池用保護回路を備えた電池パック。5. A battery pack comprising a plurality of batteries connected in series and provided with a series-connected battery protection circuit, wherein each of the batteries monitors a voltage that is higher than an overcharge voltage or lower than an overdischarge voltage. A voltage monitoring circuit, and a bypass circuit for bypassing the charging current of each of the batteries. When the voltage monitoring circuit monitors a voltage, when a voltage exceeds an overcharge voltage, a first switching element is turned on to turn off the bypass circuit. A plurality of overcharge protection circuits to be operated; a plurality of overdischarge protection circuits for turning on a second switching element when the voltage drops below an overdischarge voltage by monitoring the voltage by the voltage monitoring circuit; Controlling the charging and discharging of the battery of the above, the charging is stopped on condition that all the first switching elements of the plurality of overcharge protection circuits are turned on,
A charge / discharge control circuit for stopping discharge on condition that any second switching element of the plurality of overdischarge protection circuits is turned on. Battery pack.
電源により充電される請求項５記載の電池パックと、該
電池パックの出力を定電圧に調整して出力する電圧変換
回路とを有するバックアップ電源装置。6. A power supply for converting an alternating current into a direct current and outputting the output, a battery pack according to claim 5 charged by the power source, and a voltage conversion circuit for adjusting the output of the battery pack to a constant voltage and outputting the same. Backup power supply.
池は、リチウムイオン電池であることを特徴とする請求
項６記載のバックアップ電源装置。7. The backup power supply according to claim 6, wherein the battery used for the backup power supply is a lithium ion battery.
／ＤＣコンバータであることを特徴とする請求項６記載
のバックアップ電源装置。8. An AC power supply connected to a commercial power supply.
7. The backup power supply according to claim 6, wherein the backup power supply is a DC / DC converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16351099A JP3347300B2 (en) | 1999-06-10 | 1999-06-10 | Protection circuit for series-connected battery, battery pack provided with the protection circuit, and backup power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16351099A JP3347300B2 (en) | 1999-06-10 | 1999-06-10 | Protection circuit for series-connected battery, battery pack provided with the protection circuit, and backup power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000354335A true JP2000354335A (en) | 2000-12-19 |
| JP3347300B2 JP3347300B2 (en) | 2002-11-20 |
Family
ID=15775245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16351099A Expired - Lifetime JP3347300B2 (en) | 1999-06-10 | 1999-06-10 | Protection circuit for series-connected battery, battery pack provided with the protection circuit, and backup power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3347300B2 (en) |
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