JP2000358335A - Semiconductor device for controlling charging and discharging - Google Patents
Semiconductor device for controlling charging and dischargingInfo
- Publication number
- JP2000358335A JP2000358335A JP2000114173A JP2000114173A JP2000358335A JP 2000358335 A JP2000358335 A JP 2000358335A JP 2000114173 A JP2000114173 A JP 2000114173A JP 2000114173 A JP2000114173 A JP 2000114173A JP 2000358335 A JP2000358335 A JP 2000358335A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voltage
- charging current
- current
- abnormal
- 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.)
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Classifications
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- 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
Abstract
Description
【発明の属する技術分野】本発明は充電器から２次電池
への充電電流が異常に大きい場合（異常充電電流の場
合）における２次電池の保護に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to protection of a secondary battery when the charging current from the charger to the secondary battery is abnormally large (in the case of an abnormal charging current).
【従来の技術】図２に従来の２次電池の充電および放電
に対する保護ICおよび保護装置を示す。従来の保護装置
は従来の保護IC２１と放電電流制御スイッチ素子１６と
充電電流制御スイッチ素子１７と電流ヒューズ２２とか
らなり、従来の保護IC２１は過充電検出回路７、過放電
検出回路８、過電流検出回路９、レベル変換回路１０、
NOR回路１４、などを有し、放電電流制御スイッチ素子
１６と充電電流制御スイッチ素子１７のオン／オフを制
御することによって、２次電池１５が過大な電圧にまで
充電されるのを防止する機能（過充電保護機能）と、２
次電池１５が過小な電圧にまで放電されるのを防止する
機能（過放電保護機能）と、２次電池１５が過大な電流
を放電するのを防止する機能（過電流保護機能）を有す
る。従来の保護装置では、充電器から２次電池１５へ過
大な充電電流を流すのを防止する機能（異常充電電流保
護機能）を実現するために、２次電池正極接続端子２と
充電器正極接続端子１９の間に電流ヒューズ２２を設
け、大きな充電電流（異常な充電電流）が流れると電流
ヒューズ２２が切断されるようになっていた。2. Description of the Related Art FIG. 2 shows a conventional protection IC and a protection device for charging and discharging a secondary battery. The conventional protection device includes a conventional protection IC 21, a discharge current control switch element 16, a charging current control switch element 17, and a current fuse 22. The conventional protection IC 21 includes an overcharge detection circuit 7, an overdischarge detection circuit 8, A detection circuit 9, a level conversion circuit 10,
A function of preventing the secondary battery 15 from being charged to an excessive voltage by controlling ON / OFF of the discharge current control switch element 16 and the charge current control switch element 17 (Overcharge protection function) and 2
It has a function of preventing the secondary battery 15 from being discharged to an excessively low voltage (overdischarge protection function) and a function of preventing the secondary battery 15 from discharging an excessive current (overcurrent protection function). In the conventional protection device, in order to realize a function of preventing an excessive charging current from flowing from the charger to the secondary battery 15 (abnormal charging current protection function), the secondary battery positive terminal 2 and the charger positive terminal are connected. A current fuse 22 is provided between the terminals 19, and when a large charging current (abnormal charging current) flows, the current fuse 22 is cut.
【発明が解決しようとする課題】従来の電流ヒューズを
用いた場合、１度でも異常充電電流を検出すると、保護
装置を含んだ２次電池は２度と使えなくなってしまうと
言う問題点があった。また電流ヒューズの抵抗成分によ
る発熱によって効率が落ちると言う問題点があった。ま
た電流ヒューズを付けることによって部品点数が増え、
実装面積も大きくなって、低コスト化、小型軽量化の妨
げになると言う問題点があった。When a conventional current fuse is used, if an abnormal charging current is detected even once, the secondary battery including the protection device cannot be used again. Was. Further, there is a problem that the efficiency is reduced due to heat generated by the resistance component of the current fuse. Also, adding a current fuse increases the number of parts,
There is a problem that the mounting area becomes large, which hinders cost reduction and reduction in size and weight.
【課題を解決するための手段】本発明は上記問題点を解
決するために、電流ヒューズを使用せず、スイッチ素子
のオン状態の抵抗値を用いて異常充電電流を検出するよ
うにした。In order to solve the above-mentioned problems, the present invention does not use a current fuse, but detects an abnormal charging current by using a resistance value of an ON state of a switch element.
【発明の実施の形態】スイッチ素子のオン／オフによっ
て充電器から２次電池への充電電流と２次電池から負荷
への放電電流を制御する装置において、スイッチ素子の
オン状態の抵抗値を用いて異常充電電流を検出し、異常
充電電流を検出した後は充電器が切り離なされる迄、異
常充電電流検出状態を保持する。DESCRIPTION OF THE PREFERRED EMBODIMENTS In an apparatus for controlling a charging current from a charger to a secondary battery and a discharging current from a secondary battery to a load by turning on / off a switching element, a resistance value of the switching element in an on state is used. After detecting the abnormal charging current, the abnormal charging current detection state is maintained until the charger is disconnected after detecting the abnormal charging current.
【実施例】図１に本発明の保護ICおよび保護装置の実施
例を示す。本発明の保護装置は保護IC１と放電電流制御
スイッチ素子１６と充電電流制御スイッチ素子１７とか
らなり、保護IC１は過充電検出回路７、過放電検出回路
８、過電流検出回路９、レベル変換回路１０、異常充電
電流検出回路１１、NOR回路１４、NAND回路１２，１
３、保持回路２３、などを有し、放電電流制御スイッチ
素子１６と充電電流制御スイッチ素子１７のオン／オフ
を制御することによって、２次電池１５が過大な電圧に
まで充電されるのを防止する機能（過充電保護機能）
と、２次電池１５が過小な電圧にまで放電されるのを防
止する機能（過放電保護機能）と、２次電池１５が過大
な放電電流を流すのを防止する機能（過電流保護機能）
と、充電器から２次電池１５へ過大な充電電流が流され
るのを防止する機能（異常充電電流保護機能）を有す
る。過充電検出回路７は２次電池正極接続端子２と２次
電池負極接続端子３の間の電圧が所望の電圧（例えば
４．２Ｖ）以上になったら、レベル変換回路１０を通し
て充電電流制御スイッチ素子１７をオフさせるための回
路である。レベル変換回路１０は充電電流制御スイッチ
素子１７をオフさせるために、充電電流制御スイッチ素
子接続端子５のロー・レベルを充電器負極接続端子２０
の電位に変換するための回路である。過放電検出回路８
は２次電池正極接続端子２と２次電池負極接続端子３の
間の電圧が所望の電圧（例えば２．３Ｖ）以下になった
ら放電電流制御スイッチ素子１６をオフさせるための回
路である。過電流検出回路９は充電器負極接続端子２０
の電圧が２次電池負極接続端子３の電圧に対して所望の
電圧値（例えば＋０．２Ｖ）以上になったら放電電流制
御スイッチ素子１６をオフさせるための回路である。抵
抗１８は充電器の正極と負極が逆に接続された場合に流
れる電流を制限するためのもので通常1kΩから1MΩ程度
の値をとる。異常充電電流検出回路１１は充電器負極接
続端子２０の電圧が２次電池負極接続端子３の電圧に対
して所望の電圧値（例えば−０．４Ｖ）以下になったら
充電電流制御スイッチ素子１７をオフさせるための回路
である。ここで、図１のように放電電流制御スイッチ素
子１６が異常充電電流検出回路１１の検出電圧区間（図
１では充電器負極接続端子２０と２次電池負極接続端子
３の間）に含まれる場合は、所望の充電電流（例えば2A
以上の充電電流）で異常充電電流を検出するには放電電
流制御スイッチ素子１６がオンであるかオフであるかに
よって異常充電電流検出電圧を変化させなければならな
い。なぜなら、図１のように放電電流制御スイッチ素子
１６が異常充電電流検出回路１１の検出電圧区間（図１
では充電器負極接続端子２０と２次電池負極接続端子３
の間）に含まれる場合は、同じ充電電流でも放電電流制
御スイッチ素子１６がオンの場合とオフの場合ではスイ
ッチ素子の抵抗値は１０桁以上も異なるので、異常充電
電流検出回路１１の検出電圧区間に発生する電圧は大き
く異なるからである。そこで、本発明では放電電流制御
スイッチ素子１６がオンの時のみ異常充電電流を検出す
ることによって、異常充電電流検出電圧を固定する事が
出来るようになった。図１の実施例では、NAND回路１２
によって放電電流制御スイッチ素子１６がオンかつ充電
器負極接続端子２０の電圧が２次電池負極接続端子３の
電圧に対して所望の電圧値（例えば−０．４Ｖ）以下の
時、充電電流制御スイッチ素子１７をオフさせる構成を
取っている。さらに図１の実施例では、保持回路２３に
よって異常充電電流を検出した後は充電器が切離される
迄（異常充電電流が解除される迄）、放電制御スイッチ
素子のオン／オフに関係無く、異常充電電流検出状態を
保持し、異常な充電器が接続されている間は必ず異常充
電電流保護機能が効くようにした。異常充電電流検出状
態を保持する回路（保持回路２３）が無い場合、過放電
検出電圧以下の２次電池に異常な充電器が接続された場
合、下記に示す〜を繰り返して発振する。 異常な充電器が過放電検出電圧以下の２次電池に接
続されると過大な充電電流が流れる。 異常充電電流と２次電池の内部インピーダンスによ
って、２次電池の電圧が過放電解除電圧以上に上昇す
る。 保護ICは過放電を解除して放電電流制御スイッチ素
子をオンさせる。 放電電流制御スイッチ素子がオンになったので異常
充電電流を検出し始める。 異常充電電流を検出して充電電流制御スイッチ素子
をオフさせる。 充電電流制御スイッチ素子がオフしたので充電電流
が無くなり、２次電池の電圧が再び過放電検出電圧以下
に下がる。 保護ICは過放電を検出して放電電流制御スイッチ素
子をオフさせる。 放電電流制御スイッチ素子がオフになると異常充電
電流検出が無効になり、充電電流制御スイッチ素子がオ
ンする。 充電電流制御スイッチ素子がオンすると再び異常な
充電器から充電が開始されに戻る。 異常充電電流検出状態を保持する回路がある場合は、
において異常充電電流状態を保持するので発振しなくな
る。また、保持回路２３を使用しなくとも、異常充電電
流を検出した後、過放電検出機能を停止することで（異
常充電電流を検出した後、放電電流制御スッチ素子をオ
フしないようにすることで）、過放電検出電圧以下の２
次電池に異常な充電器が接続された場合の発振を防ぐこ
とが可能である。本発明の実施例図１の回路ブロック
（７〜１１、２３）の中身の１例を図３から図９に示
す。図３は図１の過充電検出回路７の中身の１例であ
る。図３の回路は２次電池正極端子２と２次電池負極端
子３の間を過充電検出電圧調整用分割抵抗２４で分圧し
た電圧と基準電圧回路２５の出力電圧をコンパレータ回
路２６で比較し、２次電池１５の電圧が過充電検出電圧
以上になるとコンパレータ回路２６の出力信号線Aの電
圧をHighからLowへ変化させる機能を有する。なお、図
３は回路構成を変えてコンパレータ回路２６の出力をLo
wからHighへ変化させても良い。また、過充電の検出と
解除にヒステリシス電圧を設けたり、検出と解除に遅延
を設けたりしてコンパレータ回路２６の出力が発振する
のを防いでも良い。図４は図１の過放電検出回路８の中
身の１例である。図４の回路は２次電池正極端子２と２
次電池負極端子３の間を過放電検出電圧調整用分割抵抗
２７で分圧した電圧と基準電圧回路２８の出力電圧をコ
ンパレータ回路２９で比較し、２次電池１５の電圧が過
放電検出電圧以下になるとコンパレータ回路２９の出力
信号線Bの電圧をLowからHighへ変化させる機能を有す
る。なお、図４は回路構成を変えてコンパレータ回路２
９の出力をHighからLowへ変化させても良い。また、過
放電の検出と解除にヒステリシス電圧を設けたり、検出
と解除に遅延を設けたりしてコンパレータ回路２９の出
力が発振するのを防いでも良い。図５は図１の過電流検
出回路９の中身の１例である。図５の回路は図１の充電
器負極接続端子６の電圧と基準電圧回路３０の出力電圧
をコンパレータ回路３１で比較し、充電器負極接続端子
６の電圧が過電流検出電圧以上になるとコンパレータ回
路３１の出力信号線Cの電圧をLowからHighへ変化させる
機能を有する。なお、図５は回路構成を変えてコンパレ
ータ回路３１の出力をHighからLowへ変化させても良
い。また、過電流の検出と解除にヒステリシス電圧を設
けたり、検出と解除に遅延を設けたりしてコンパレータ
回路３１の出力が発振するのを防いでも良い。図６は図
１のレベル変換回路１０の中身の１例である。図６の回
路はレベル変換回路の入力信号線DのLow電圧を図１の２
次電池負極端子３の電圧から充電器負極接続端子６の電
圧（充電器負極電位の入力信号線Eの電圧）へ変換して
レベル変換回路の出力信号線Fへ出力する機能を有す
る。例えば、レベル変換回路の入力信号線Dの電圧が２
次電池正極端子２の電圧と等しい場合は、Pchトランジ
スタ３２がOFF、インバーター回路３６の出力が２次電
池負極端子３と同電圧、Pchトランジスタ３３がON、Nch
トランジスタ３４がONとなり、レベル変換回路の出力信
号線Fの出力電圧は充電器負極接続端子６の電圧（充電
器負極電位の入力信号線Eの電圧）を出力する。次に、
レベル変換回路の入力信号線Dの電圧が２次電池負極端
子３の電圧と等しい場合は、Pchトランジスタ３２がO
N、インバーター回路３６の出力が２次電池正極端子２
と同電圧、Pchトランジスタ３３がOFF、Nchトランジス
タ３４がOFFとなり、レベル変換回路の出力信号線Fの出
力電圧は２次電池正極端子２の電圧を出力する。図７は
図１の異常充電電流検出回路１１の中身の１例である。
図７の回路は図１の充電器負極接続端子６の電圧にオフ
セット電圧発生回路３７の電圧を加算した電圧と２次電
池負極端子３の電圧をコンパレータ回路３８で比較し、
充電器負極接続端子６の電圧が異常充電電流検出電圧以
下になるとコンパレータ回路３８の出力信号線Cの電圧
をHighからLowへ変化させる機能を有する。なお、図７
は回路構成を変えてコンパレータ回路３８の出力をLow
からHighへ変化させても良い。また、異常充電電流の検
出と解除にヒステリシス電圧を設けたり、検出と解除に
遅延を設けたりしてコンパレータ回路３８の出力が発振
するのを防いでも良い。また、図７ではオフセット電圧
発生回路３７をコンパレータ回路３８と分けて描写して
いるが、オフセット電圧発生回路３７を無くしてコンパ
レータ回路３８に意図的にオフセット電圧を設けたもの
を用いても良い。図８は図１の保持回路２３の中身の１
例である。図８の回路はSRラッチの一種で、保持回路の
入力信号線Hがセットバー入力に相当し、異常充電電流
検出回路の出力信号線Gがリセットバー入力に相当する
機能を有する。異常充電電流検出回路の出力信号線Gの
電圧がHighで、保持回路の入力信号線Hの電圧がLowから
Highに変わると保持回路の出力信号線Iの電圧がLowに保
持される。保持回路の出力信号線Iの電圧がHighに戻る
のは異常充電電流検出回路の出力信号線Gの電圧がLowに
なった時（異常充電電流が解除された時）である。図８
の点線で囲んだ部分はOR-NAND回路４１であり、図９に
示すようにPchトランジスタ３個とNchトランジスタ３個
で構成され、論理的にはNANDの片方の入力にORが付いた
ものである。図３から図９に示した回路以外であって
も、本発明の意図することを実現するものであればどん
な回路であっても構わない、本発明は請求項で示した概
念に従って構成された保護ICおよび保護装置に関わるも
のであって、本発明の概念を実現する手段によって限定
されものでは無い。FIG. 1 shows an embodiment of a protection IC and a protection device according to the present invention. The protection device of the present invention comprises a protection IC 1, a discharge current control switch element 16 and a charge current control switch element 17, and the protection IC 1 comprises an overcharge detection circuit 7, an overdischarge detection circuit 8, an overcurrent detection circuit 9, a level conversion circuit 10, abnormal charging current detection circuit 11, NOR circuit 14, NAND circuits 12, 1
3, a holding circuit 23, etc., to prevent the secondary battery 15 from being charged to an excessive voltage by controlling on / off of the discharge current control switch element 16 and the charge current control switch element 17. Function (overcharge protection function)
A function of preventing the secondary battery 15 from being discharged to an excessively low voltage (overdischarge protection function), and a function of preventing the secondary battery 15 from flowing an excessive discharge current (overcurrent protection function).
And a function of preventing an excessive charging current from flowing from the charger to the secondary battery 15 (abnormal charging current protection function). When the voltage between the secondary battery positive electrode connection terminal 2 and the secondary battery negative electrode connection terminal 3 exceeds a desired voltage (for example, 4.2 V), the overcharge detection circuit 7 passes through the level conversion circuit 10 to charge the charge current control switch element. 17 is a circuit for turning off. The level conversion circuit 10 changes the low level of the charging current control switch element connection terminal 5 to the charger negative connection terminal 20 to turn off the charging current control switch element 17.
This is a circuit for converting the electric potential into a potential. Overdischarge detection circuit 8
Is a circuit for turning off the discharge current control switch element 16 when the voltage between the secondary battery positive electrode connection terminal 2 and the secondary battery negative electrode connection terminal 3 becomes lower than a desired voltage (for example, 2.3 V). The overcurrent detection circuit 9 is connected to a charger negative connection terminal 20.
Is a circuit for turning off the discharge current control switch element 16 when the voltage of the secondary battery exceeds a desired voltage value (for example, +0.2 V) with respect to the voltage of the secondary battery negative electrode connection terminal 3. The resistor 18 limits the current flowing when the positive and negative electrodes of the charger are connected in reverse, and usually takes a value of about 1 kΩ to 1 MΩ. The abnormal charging current detecting circuit 11 activates the charging current control switch element 17 when the voltage of the charger negative connection terminal 20 falls below a desired voltage value (for example, -0.4 V) with respect to the voltage of the secondary battery negative connection terminal 3. This is a circuit for turning off. Here, as shown in FIG. 1, the discharge current control switch element 16 is included in the detection voltage section of the abnormal charging current detection circuit 11 (in FIG. 1, between the charger negative electrode connection terminal 20 and the secondary battery negative electrode connection terminal 3). Is the desired charging current (eg 2A
In order to detect an abnormal charging current with the above charging current, the abnormal charging current detection voltage must be changed depending on whether the discharge current control switch element 16 is on or off. This is because, as shown in FIG. 1, the discharge current control switch element 16 is connected to the detection voltage section of the abnormal charge current detection circuit 11 (FIG. 1).
Then, the charger negative electrode connection terminal 20 and the secondary battery negative electrode connection terminal 3
If the discharge current control switch element 16 is on and off, the resistance value of the switch element differs by more than 10 digits even if the charge current is the same. This is because the voltages generated in the sections differ greatly. Therefore, in the present invention, the abnormal charge current detection voltage can be fixed by detecting the abnormal charge current only when the discharge current control switch element 16 is ON. In the embodiment of FIG.
When the discharge current control switch element 16 is turned on and the voltage of the charger negative connection terminal 20 is lower than a desired voltage value (for example, -0.4 V) with respect to the voltage of the secondary battery negative connection terminal 3, the charge current control switch The configuration is such that the element 17 is turned off. Further, in the embodiment of FIG. 1, after the abnormal charging current is detected by the holding circuit 23, until the charger is disconnected (until the abnormal charging current is released), regardless of the on / off state of the discharge control switch element, The abnormal charging current detection state is maintained, and the abnormal charging current protection function is always activated while the abnormal charger is connected. If there is no circuit for holding the abnormal charging current detection state (holding circuit 23), and if an abnormal charger is connected to a secondary battery having a voltage equal to or lower than the overdischarge detection voltage, the following oscillations are repeated. When an abnormal charger is connected to a secondary battery having a voltage lower than the overdischarge detection voltage, an excessive charging current flows. Due to the abnormal charging current and the internal impedance of the secondary battery, the voltage of the secondary battery rises above the overdischarge release voltage. The protection IC releases the overdischarge and turns on the discharge current control switch element. Since the discharge current control switch element is turned on, detection of an abnormal charge current starts. An abnormal charging current is detected and the charging current control switch element is turned off. Since the charging current control switch element has been turned off, the charging current is lost, and the voltage of the secondary battery drops again below the overdischarge detection voltage. The protection IC detects overdischarge and turns off the discharge current control switch element. When the discharge current control switch element is turned off, the abnormal charge current detection is invalidated, and the charge current control switch element is turned on. When the charging current control switch element is turned on, charging is started again from the abnormal charger and returns to. If there is a circuit that holds the abnormal charging current detection state,
, Oscillation is stopped because the abnormal charging current state is maintained. Even if the holding circuit 23 is not used, the overdischarge detection function is stopped after detecting the abnormal charge current (by not turning off the discharge current control switch element after detecting the abnormal charge current). 2) below the overdischarge detection voltage
Oscillation when an abnormal charger is connected to the next battery can be prevented. FIG. 3 to FIG. 9 show an example of the contents of the circuit blocks (7 to 11, 23) of FIG. FIG. 3 is an example of the contents of the overcharge detection circuit 7 of FIG. In the circuit of FIG. 3, a comparator circuit 26 compares a voltage obtained by dividing the voltage between the positive terminal 2 of the secondary battery and the negative terminal 3 of the secondary battery by the overcharge detection voltage adjusting division resistor 24 with the output voltage of the reference voltage circuit 25. And a function of changing the voltage of the output signal line A of the comparator circuit 26 from High to Low when the voltage of the secondary battery 15 becomes equal to or higher than the overcharge detection voltage. FIG. 3 shows an example in which the output of the comparator circuit 26 is changed to Lo
It may be changed from w to High. Further, a hysteresis voltage may be provided for detection and release of overcharge, or a delay may be provided for detection and release to prevent the output of the comparator circuit 26 from oscillating. FIG. 4 shows an example of the contents of the overdischarge detection circuit 8 of FIG. The circuit shown in FIG.
The voltage divided between the secondary battery negative terminals 3 by the over-discharge detection voltage adjusting divided resistor 27 is compared with the output voltage of the reference voltage circuit 28 by the comparator circuit 29, and the voltage of the secondary battery 15 is equal to or less than the over-discharge detection voltage. , The function of changing the voltage of the output signal line B of the comparator circuit 29 from Low to High. FIG. 4 shows a comparator circuit 2 with a different circuit configuration.
9 may be changed from High to Low. Further, the output of the comparator circuit 29 may be prevented from oscillating by providing a hysteresis voltage for detecting and releasing the overdischarge, or providing a delay for detecting and releasing the overdischarge. FIG. 5 shows an example of the contents of the overcurrent detection circuit 9 of FIG. The circuit of FIG. 5 compares the voltage of the charger negative connection terminal 6 of FIG. 1 with the output voltage of the reference voltage circuit 30 by a comparator circuit 31. When the voltage of the charger negative connection terminal 6 becomes higher than the overcurrent detection voltage, the comparator circuit 31 has a function of changing the voltage of the output signal line C from Low to High. In FIG. 5, the output of the comparator circuit 31 may be changed from High to Low by changing the circuit configuration. In addition, the output of the comparator circuit 31 may be prevented from oscillating by providing a hysteresis voltage for detecting and releasing the overcurrent, or providing a delay for detecting and releasing the overcurrent. FIG. 6 shows an example of the contents of the level conversion circuit 10 of FIG. The circuit shown in FIG. 6 sets the low voltage of the input signal line D of the level conversion circuit to 2 in FIG.
It has a function of converting the voltage of the secondary battery negative electrode terminal 3 to the voltage of the charger negative electrode connection terminal 6 (the voltage of the input signal line E of the charger negative electrode potential), and outputting it to the output signal line F of the level conversion circuit. For example, if the voltage of the input signal line D of the level conversion circuit is 2
When the voltage is equal to the voltage of the secondary battery positive terminal 2, the Pch transistor 32 is OFF, the output of the inverter circuit 36 is the same voltage as the secondary battery negative terminal 3, the Pch transistor 33 is ON, and the Nch
The transistor 34 is turned on, and the output voltage of the output signal line F of the level conversion circuit outputs the voltage of the charger negative electrode connection terminal 6 (the voltage of the input signal line E of the charger negative electrode potential). next,
When the voltage of the input signal line D of the level conversion circuit is equal to the voltage of the negative terminal 3 of the secondary battery, the Pch transistor 32
N, the output of the inverter circuit 36 is the secondary battery positive terminal 2
The Pch transistor 33 is turned off, the Nch transistor 34 is turned off, and the output voltage of the output signal line F of the level conversion circuit outputs the voltage of the secondary battery positive terminal 2. FIG. 7 is an example of the contents of the abnormal charging current detection circuit 11 of FIG.
The circuit of FIG. 7 compares a voltage obtained by adding the voltage of the offset voltage generating circuit 37 to the voltage of the charger negative electrode connection terminal 6 of FIG.
When the voltage of the charger negative connection terminal 6 becomes lower than the abnormal charging current detection voltage, the voltage of the output signal line C of the comparator circuit 38 is changed from High to Low. FIG.
Changes the circuit configuration and changes the output of the comparator circuit 38 to Low.
From High to High. In addition, the output of the comparator circuit 38 may be prevented from oscillating by providing a hysteresis voltage for detecting and releasing the abnormal charging current, or providing a delay for detecting and releasing the abnormal charging current. Although the offset voltage generation circuit 37 is illustrated separately from the comparator circuit 38 in FIG. 7, a circuit in which the offset voltage generation circuit 37 is omitted and an offset voltage is intentionally provided in the comparator circuit 38 may be used. FIG. 8 shows one of the contents of the holding circuit 23 of FIG.
It is an example. The circuit in FIG. 8 is a type of SR latch, and has a function in which the input signal line H of the holding circuit corresponds to the set bar input, and the output signal line G of the abnormal charging current detection circuit corresponds to the reset bar input. The voltage of the output signal line G of the abnormal charging current detection circuit is high and the voltage of the input signal line H of the holding circuit is low.
When it changes to High, the voltage of the output signal line I of the holding circuit is held at Low. The voltage of the output signal line I of the holding circuit returns to High when the voltage of the output signal line G of the abnormal charging current detection circuit becomes Low (when the abnormal charging current is released). FIG.
The portion surrounded by the dotted line is an OR-NAND circuit 41, which is composed of three Pch transistors and three Nch transistors, as shown in FIG. is there. Any circuit other than the circuits shown in FIGS. 3 to 9 may be used as long as the purpose of the present invention is realized. The present invention is configured according to the concept described in the claims. The present invention relates to a protection IC and a protection device, and is not limited by means for realizing the concept of the present invention.
【発明の効果】本発明で示したように電流ヒューズを使
用せず、スイッチ素子のオン状態の抵抗値を用いて異常
充電電流を検出することによって、何度でも異常充電電
流を検出することが可能となり、異常充電電流検出後は
２度と使えなくなると言うことは無くなる。また電流ヒ
ューズなどの余分な抵抗成分による発熱が無くなり、放
電効率は向上する。また電流ヒューズが不要となるので
部品点数が減り、実装面積も小さくなって、低コスト
化、小型軽量化が可能となる。As described in the present invention, the abnormal charging current can be detected any number of times by detecting the abnormal charging current by using the ON-state resistance value of the switch element without using the current fuse. It becomes possible, and it is no longer possible to use again after detecting the abnormal charging current. Further, heat generation due to an extra resistance component such as a current fuse is eliminated, and discharge efficiency is improved. In addition, since a current fuse is not required, the number of components is reduced, the mounting area is reduced, and cost reduction and reduction in size and weight can be achieved.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明の保護ICと保護装置である。FIG. 1 shows a protection IC and a protection device according to the present invention.
【図２】従来の保護ICと保護装置である。FIG. 2 shows a conventional protection IC and a protection device.
【図３】過充電検出回路である。FIG. 3 is an overcharge detection circuit.
【図４】過放電検出回路である。FIG. 4 is an overdischarge detection circuit.
【図５】過電流検出回路である。FIG. 5 is an overcurrent detection circuit.
【図６】レベル変換回路である。FIG. 6 shows a level conversion circuit.
【図７】異常充電電流検出回路である。FIG. 7 is an abnormal charging current detection circuit.
【図８】保持回路である。FIG. 8 illustrates a holding circuit.
【図９】OR-NAND回路である。FIG. 9 illustrates an OR-NAND circuit.
1 本発明の保護IC 2 ２次電池正極接続端子 3 ２次電池負極接続端子 4 放電電流制御スイッチ素子接続端子 5 充電電流制御スイッチ素子接続端子 6 充電器負極接続端子 7 過充電検出回路 8 過放電検出回路 9 過電流検出回路 10 レベル変換回路 11 異常充電電流検出回路 12,13 NAND回路 14 NOR回路 15 ２次電池 16 放電電流制御スイッチ素子 17 充電電流制御スイッチ素子 18 充電器逆接続時電流制限抵抗 19 充電器正極接続端子 20 充電器負極接続端子 21 従来の保護IC 22 流ヒューズ 23 保持回路 24 過充電検出電圧調整用分割抵抗 25 基準電圧回路 26 コンパレータ回路 27 過放電検出電圧調整用分割抵抗 28 基準電圧回路 29 コンパレータ回路 30 基準電圧回路 31 コンパレータ回路 32,33 Pchトランジスタ 34,35 Nch トランジスタ 36 インバータ回路 37 オフセット電圧発生回路 38 コンパレータ回路 39,40 インバータ回路 41 OR-NAND回路 42,43,44 Pch トランジスタ 45,46,47 Nch トランジスタ A 過充電検出回路の出力信号線 B 過放電検出回路の出力信号線 C 過電流検出回路の出力信号線 D レベル変換回路の入力信号線 E 充電器負極電位の入力信号線 F レベル変換回路の出力信号線 G 異常充電電流検出回路の出力信号線 H 保持回路の入力信号線 I 保持回路の出力信号線 J,K OR-NAND回路のOR入力信号線 1 Protection IC of the present invention 2 Secondary battery positive connection terminal 3 Secondary battery negative connection terminal 4 Discharge current control switch element connection terminal 5 Charge current control switch element connection terminal 6 Charger negative electrode connection terminal 7 Overcharge detection circuit 8 Overdischarge Detection circuit 9 Overcurrent detection circuit 10 Level conversion circuit 11 Abnormal charge current detection circuit 12,13 NAND circuit 14 NOR circuit 15 Secondary battery 16 Discharge current control switch element 17 Charge current control switch element 18 Current limiting resistance when charger is reverse connected 19 Charger positive terminal 20 Charger negative terminal 21 Conventional protection IC 22 Current fuse 23 Holding circuit 24 Divider resistor for overcharge detection voltage adjustment 25 Reference voltage circuit 26 Comparator circuit 27 Divider resistor for overdischarge detection voltage adjustment 28 Reference Voltage circuit 29 Comparator circuit 30 Reference voltage circuit 31 Comparator circuit 32,33 Pch transistor 34,35 Nch transistor 36 Inverter circuit 37 Offset voltage generation circuit 38 Comparator circuit 39,40 Inverter circuit 41 OR-NAND circuit 42,43,44 Pch transistor 45,46,47 Nch transistor A Output signal line of overcharge detection circuit B Output signal line of overdischarge detection circuit C Overcurrent detection circuit Output signal line D Input signal line of level conversion circuit E Input signal line of charger negative potential F Output signal line of level conversion circuit G Output signal line of abnormal charging current detection circuit H Input signal line of holding circuit I Input circuit of holding circuit Output signal line OR input signal line of J, K OR-NAND circuit
Claims (4)
ン／オフによって充電器から２次電池への充電電流と２
次電池から負荷への放電電流を制御する装置において、
少なくとも一つ以上の前記スイッチ素子のオン状態の抵
抗値を用いて異常充電電流を検出することを特徴とす
る、充放電制御用半導体装置。A charging current from a charger to a secondary battery is determined by turning on / off at least one switching element.
In the device that controls the discharge current from the secondary battery to the load,
A charge / discharge control semiconductor device, wherein an abnormal charge current is detected using a resistance value of at least one of the switch elements in an on state.
電流制御スイッチ素子がオンである時にのみ異常充電電
流検出を可能とすることを特徴とする請求項１記載の充
放電用半導体装置。2. The charge / discharge semiconductor device according to claim 1, wherein the abnormal charge current can be detected only when the discharge current control switch element of the switch elements is turned on.
り離なされる迄、異常充電電流検出状態を保持すること
を特徴とする請求項２記載の充放電用半導体装置。3. The charge / discharge semiconductor device according to claim 2, wherein after detecting the abnormal charging current, the abnormal charging current detection state is maintained until the charger is disconnected.
り離なされる迄、過放電検出機能を停止することを特徴
とする請求項２記載の充放電用半導体装置。4. The charge / discharge semiconductor device according to claim 2, wherein after detecting the abnormal charge current, the overdischarge detection function is stopped until the charger is disconnected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000114173A JP2000358335A (en) | 1999-04-15 | 2000-04-14 | Semiconductor device for controlling charging and discharging |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10800299 | 1999-04-15 | ||
| JP11-108002 | 1999-04-15 | ||
| JP2000114173A JP2000358335A (en) | 1999-04-15 | 2000-04-14 | Semiconductor device for controlling charging and discharging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000358335A true JP2000358335A (en) | 2000-12-26 |
Family
ID=26447979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000114173A Pending JP2000358335A (en) | 1999-04-15 | 2000-04-14 | Semiconductor device for controlling charging and discharging |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000358335A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002325360A (en) * | 2001-04-24 | 2002-11-08 | Seiko Instruments Inc | Circuit for monitoring battery state and battery device |
| JP2003180040A (en) * | 2001-09-06 | 2003-06-27 | Yokogawa Electric Corp | Battery backup circuit |
| JP2015173568A (en) * | 2014-03-12 | 2015-10-01 | 日立マクセル株式会社 | battery protection circuit and battery pack |
| US11293985B2 (en) | 2018-09-12 | 2022-04-05 | Lg Energy Solution, Ltd. | Switch diagnosing apparatus and method |
-
2000
- 2000-04-14 JP JP2000114173A patent/JP2000358335A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002325360A (en) * | 2001-04-24 | 2002-11-08 | Seiko Instruments Inc | Circuit for monitoring battery state and battery device |
| JP4555502B2 (en) * | 2001-04-24 | 2010-10-06 | セイコーインスツル株式会社 | Battery state monitoring circuit and battery device |
| JP2003180040A (en) * | 2001-09-06 | 2003-06-27 | Yokogawa Electric Corp | Battery backup circuit |
| JP2015173568A (en) * | 2014-03-12 | 2015-10-01 | 日立マクセル株式会社 | battery protection circuit and battery pack |
| US11293985B2 (en) | 2018-09-12 | 2022-04-05 | Lg Energy Solution, Ltd. | Switch diagnosing apparatus and method |
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