JPH06269131A - Charging control method and charging apparatus - Google Patents
Charging control method and charging apparatusInfo
- Publication number
- JPH06269131A JPH06269131A JP5047593A JP5047593A JPH06269131A JP H06269131 A JPH06269131 A JP H06269131A JP 5047593 A JP5047593 A JP 5047593A JP 5047593 A JP5047593 A JP 5047593A JP H06269131 A JPH06269131 A JP H06269131A
- Authority
- JP
- Japan
- Prior art keywords
- charging
- battery
- terminal voltage
- nickel
- cadmium battery
- 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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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、特にニッケ
ルカドミウム電池の有するメモリー効果を効率よく解消
し、充電時間の短縮および、充放電の繰り返し寿命（以
下サイクル寿命と略称する）の延長を図ったニッケルカ
ドミウム電池の充電制御方法及び充電装置に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention efficiently eliminates the memory effect of a secondary battery, especially a nickel-cadmium battery, shortens the charging time, and extends the charge / discharge cycle life (hereinafter abbreviated as cycle life). The present invention relates to a charging control method and a charging device for a nickel-cadmium battery.
【０００２】[0002]
【従来の技術】近年、ニッケルカドミウム電池は音響映
像機器、情報通信機器等の分野でその経済性、利用の簡
便性から需要を大きく延ばしてきている。2. Description of the Related Art In recent years, demand for nickel-cadmium batteries has greatly increased in the fields of audio-visual equipment, information communication equipment, etc. due to their economical efficiency and ease of use.
【０００３】しかしながら、ニッケルカドミウム電池は
電池の容量が残っている状態で充放電を繰り返すと、使
用時間が低下するという特性を有している。この現象は
一般的にメモリー効果と呼ばれ、このメモリー効果を解
消するため電池を強制放電する方法（以下リフレッシュ
と呼ぶ）が採用されている。However, the nickel-cadmium battery has a characteristic that its use time is shortened when charging and discharging are repeated with the battery capacity remaining. This phenomenon is generally called a memory effect, and a method of forcibly discharging the battery (hereinafter referred to as refresh) is adopted to eliminate this memory effect.
【０００４】以下に従来の充電装置について説明する。
図３は従来の充電装置のブロック図である。図におい
て、４はニッケルカドミウム電池、ニッケルカドミウム
電池４の端子電圧を検出する電圧検出回路１、充電電流
を制御する充電回路２、ニッケルカドミウム電池４の強
制放電を行う放電回路３、各回路を制御する制御回路
５、端子電圧を判定するためのデータや制御回路５のプ
ログラムを格納しておく記憶素子６から構成される。A conventional charging device will be described below.
FIG. 3 is a block diagram of a conventional charging device. In the figure, 4 is a nickel-cadmium battery, a voltage detection circuit 1 for detecting the terminal voltage of the nickel-cadmium battery 4, a charging circuit 2 for controlling the charging current, a discharging circuit 3 for forcibly discharging the nickel-cadmium battery 4, and controlling each circuit. And a storage element 6 for storing data for determining the terminal voltage and a program for the control circuit 5.
【０００５】図４は、従来の充電制御方法のフローチャ
ートである。まず、充電状態になると、ニッケルカドミ
ウム電池４の端子電圧を電圧検出回路１によって検出す
る（ステップ１）。検出された端子電圧の値は予め記憶
素子６に記憶されている設定値と比較される（ステップ
２）。端子電圧が設定値より小さい場合は放電回路３を
動作させて、ニッケルカドミウム電池４を強制放電させ
るリフレッシュ動作をするように制御回路５によって制
御される（ステップ３）。ステップ２で端子電圧が設定
値以上の場合、及びステップ３のリフレッシュ動作が終
了すると、制御回路５によって充電回路２を動作させて
ニッケルカドミウム電池４を充電する制御が開始する
（ステップ４）。FIG. 4 is a flowchart of a conventional charge control method. First, when the battery is charged, the terminal voltage of the nickel-cadmium battery 4 is detected by the voltage detection circuit 1 (step 1). The detected terminal voltage value is compared with the set value stored in the storage element 6 in advance (step 2). When the terminal voltage is lower than the set value, the control circuit 5 controls the discharge circuit 3 to operate and the refresh operation to forcibly discharge the nickel-cadmium battery 4 (step 3). When the terminal voltage is equal to or higher than the set value in step 2, and when the refresh operation in step 3 is completed, the control circuit 5 starts the control of operating the charging circuit 2 to charge the nickel-cadmium battery 4 (step 4).
【０００６】このようにして、一定の端子電圧未満にな
るとリフレッシュ動作を行うことによって、メモリ効果
の発生を予防することが行われてきた。As described above, the occurrence of the memory effect has been prevented by performing the refresh operation when the voltage becomes lower than a certain terminal voltage.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら上記従来
の制御方法では、ニッケルカドミウム電池のメモリー効
果発生の有無に関わらず、充電を行う度にリフレッシュ
動作をおこなうので、充電時間が不必要に長くなり、ま
た逆にニッケルカドミウム電池のサイクル寿命を低下さ
せるという問題を有していた。However, in the above conventional control method, the refresh operation is performed each time the battery is charged regardless of whether or not the memory effect of the nickel-cadmium battery occurs, so that the charging time becomes unnecessarily long, On the contrary, there is a problem that the cycle life of the nickel-cadmium battery is shortened.
【０００８】本発明は上記の問題を解決するためになさ
れたもので、ニッケルカドミウム電池の使用状況からメ
モリー効果発生の有無を判断し、リフレッシュを効率よ
く行うことで充電時間を短縮するだけでなく、ニッケル
カドミウム電池のサイクル寿命を大幅に向上させる充電
制御方法及び充電装置を提供することを目的とする。The present invention has been made in order to solve the above-mentioned problems, and not only shortens the charging time by judging whether the memory effect occurs or not based on the usage status of the nickel-cadmium battery and performing refreshing efficiently. An object of the present invention is to provide a charging control method and a charging device that significantly improve the cycle life of a nickel-cadmium battery.
【０００９】[0009]
【課題を解決するための手段】この目的を達成するため
に本発明における充電装置は、ニッケルカドミウム電池
の端子電圧を検出する電圧検出手段と、ニッケルカドミ
ウム電池を強制放電させる放電手段と、ニッケルカドミ
ウム電池を充電する充電手段と、プログラムや端子電圧
を判定するためのデータやニッケルカドミウム電池の充
放電に関する来歴データを記憶する記憶手段と、端子電
圧と来歴データとから推定残存容量を算出する演算手段
と、記憶手段と演算手段とから得られた情報に基づき充
電手段と放電手段とを制御する制御手段とを有し、電圧
検出手段によって検出されたニッケルカドミウム電池の
端子電圧が推定残存容量から実際に消費した電池容量に
相当する推定端子電圧に比べ低い場合には、メモリ効果
が発生していると判断しリフレッシュ動作をした後に充
電手段によって充電をし、端子電圧が推定端子電圧に比
べ同じか高い場合には、充電手段によって充電をするよ
うに制御したものである。To achieve this object, a charging device according to the present invention comprises a voltage detecting means for detecting a terminal voltage of a nickel-cadmium battery, a discharging means for forcibly discharging the nickel-cadmium battery, and a nickel-cadmium battery. Charging means for charging the battery, storage means for storing data for determining programs and terminal voltages and history data regarding charging / discharging of nickel-cadmium battery, and computing means for calculating estimated remaining capacity from terminal voltage and history data And a control means for controlling the charging means and the discharging means based on the information obtained from the storage means and the calculation means, and the terminal voltage of the nickel-cadmium battery detected by the voltage detection means is actually calculated from the estimated remaining capacity. If it is lower than the estimated terminal voltage corresponding to the consumed battery capacity, it means that the memory effect is occurring. Cross to the charging by the charging means after the refresh operation, when the terminal voltage is equal to or higher than the estimated terminal voltage is obtained by controlling to the charging by the charging means.
【００１０】[0010]
【作用】本発明は上記制御方法により充電しようとする
ニッケルカドミウム電池に対してメモリー効果発生の有
無を判断できるので、メモリー効果が発生した場合のみ
リフレッシュを行うことで効率よくニッケルカドミウム
電池のメモリー効果を解消することができる。According to the present invention, it is possible to judge whether or not the memory effect is generated for the nickel-cadmium battery to be charged by the above control method. Therefore, the memory effect of the nickel-cadmium battery can be efficiently achieved by refreshing only when the memory effect occurs. Can be resolved.
【００１１】[0011]
【実施例】図１は本発明の一実施例における充電装置の
ブロック図である。なお、従来の充電装置と同一の機能
を有する構成要素には同一の符号を付し、説明を省略す
る。図において、４はニッケルカドミウム電池である。
ニッケルカドミウム電池４の端子電圧を検出する電圧検
出回路１、充電電流を制御する充電回路２、ニッケルカ
ドミウム電池４の強制放電を行う放電回路３、さらに各
回路を制御する制御回路１１、端子電圧を判定するため
のデータやニッケルカドミウム電池４の使用状況のデー
タおよび制御回路１１のプログラムを格納しておく記憶
素子１２、および記憶素子１２に記憶されているデータ
からニッケルカドミウム電池４の推定残存容量と推定端
子電圧とを算出する演算手段１３から構成される。1 is a block diagram of a charging device according to an embodiment of the present invention. The components having the same functions as those of the conventional charging device are designated by the same reference numerals, and the description thereof will be omitted. In the figure, 4 is a nickel-cadmium battery.
The voltage detection circuit 1 for detecting the terminal voltage of the nickel-cadmium battery 4, the charging circuit 2 for controlling the charging current, the discharging circuit 3 for forcibly discharging the nickel-cadmium battery 4, the control circuit 11 for controlling each circuit, the terminal voltage The estimated remaining capacity of the nickel-cadmium battery 4 is calculated from the storage element 12 that stores the data for determination, the usage status data of the nickel-cadmium battery 4, and the program of the control circuit 11, and the data stored in the storage element 12. It is composed of a calculation means 13 for calculating the estimated terminal voltage.
【００１２】図２は本発明の一実施例における充電制御
方法のフローチャートである。以下に電子機器に組み込
まれた充電装置とその充電制御方法について電子機器の
動作と共に説明する。FIG. 2 is a flow chart of the charging control method in one embodiment of the present invention. Hereinafter, a charging device incorporated in an electronic device and a charging control method thereof will be described together with the operation of the electronic device.
【００１３】まず、電子機器の使用者に対する便宜のた
め、ニッケルカドミウム電池４の推定残存容量を満充電
状態を５とする５段階に分類して管理し、使用者に表示
しているものとする。また、推定残存容量は、記憶素子
１２から得られる電子機器を使用した機能、使用時間の
データから次の計算方法に従って演算手段１３によって
算出される。First, for the convenience of the user of the electronic equipment, the estimated remaining capacity of the nickel-cadmium battery 4 is classified into 5 levels with the full charge state being 5, and is managed and displayed to the user. . Further, the estimated remaining capacity is calculated by the calculating means 13 according to the following calculation method from the data of the function using the electronic device obtained from the storage element 12 and the usage time.
【００１４】Ｃｏ＝Ｃｒ−Ｘ１−Ｘ２−・・・−Ｘｎ ここでＣｏは、ニッケルカドミウム電池４の推定残存容
量、Ｃｒは、前回の充電によってニッケルカドミウム電
池４に充電された電気容量、Ｘ１〜Ｘｎは、記憶素子１
２のデータから推定された消費電気容量である。Co = Cr-X1-X2 -... -Xn Here, Co is the estimated remaining capacity of the nickel-cadmium battery 4, Cr is the electric capacity charged in the nickel-cadmium battery 4 by the previous charging, X1- Xn is the storage element 1
It is the consumed electric capacity estimated from the data of 2.
【００１５】このようにして、電子機器の使用を開始す
るとニッケルカドミウム電池４の推定残存容量が管理さ
れている。推定残存容量が電子機器の使用に支障のない
範囲では単に管理されているだけであって、使用者は必
要に応じてその段階を確認することができる（ステップ
１１から１４）。In this way, the estimated remaining capacity of the nickel-cadmium battery 4 is managed when the use of the electronic device is started. The estimated remaining capacity is simply managed within a range that does not hinder the use of the electronic device, and the user can confirm the stage as necessary (steps 11 to 14).
【００１６】もし、この段階で使用者がＡＣアダプタを
接続すれば（ステップ１７）、制御回路１１はニッケル
カドミウム電池４を負荷から解放し充電回路２へ接続す
る制御を行って通常の充電動作が開始される（ステップ
１８）。If the user connects the AC adapter at this stage (step 17), the control circuit 11 performs control to release the nickel-cadmium battery 4 from the load and connect it to the charging circuit 2 to perform a normal charging operation. It is started (step 18).
【００１７】しかし、使用者が気付かずに使用し続けれ
ば、電子機器の使用に支障が予想される段階となり容量
減少の警告（Weak Batt.）が行われる（ステップ１
５）。さらに使用し続けるとついに推定残存容量がなく
なり充電を促す警告（Recharge Batt.）が行われ（ステ
ップ１６）、使用者がＡＣアダプタを接続する（ステッ
プ１９）。However, if the user continues to use the electronic device without noticing it, it is at a stage where the use of the electronic device is expected to be hindered, and a warning (Weak Batt.) Of capacity reduction is given (step 1
5). When the battery is further used, the estimated remaining capacity finally disappears and a warning (Recharge Batt.) Prompting charging is performed (step 16), and the user connects the AC adapter (step 19).
【００１８】次に、制御回路１１はニッケルカドミウム
電池４を負荷から解放して代わりに実負荷に相当する疑
似抵抗（図示省略）を接続し、ニッケルカドミウム電池
４の端子電圧を電圧検出回路１によって検出する（ステ
ップ２０）。検出された端子電圧の値は予め記憶素子１
２に記憶されている設定値と比較される（ステップ２
１）。ここで、設定値は次のようにして求められる。即
ち、予め記憶素子１２に記憶されているニッケルカドミ
ウム電池４の正常な状態の放電特性から推定残存容量に
対応する推定端子電圧が得られる。この推定端子電圧か
ら電子機器の負荷電流による電圧降下を差し引いた値を
新たに設定値とする。Next, the control circuit 11 releases the nickel-cadmium battery 4 from the load and instead connects a pseudo resistor (not shown) corresponding to the actual load, and the terminal voltage of the nickel-cadmium battery 4 is detected by the voltage detection circuit 1. Detect (step 20). The value of the detected terminal voltage is stored in advance in the storage element 1.
2 is compared with the set value stored in step 2 (step 2
1). Here, the set value is obtained as follows. That is, the estimated terminal voltage corresponding to the estimated remaining capacity is obtained from the discharge characteristics of the nickel-cadmium battery 4 in the normal state stored in the storage element 12 in advance. The value obtained by subtracting the voltage drop due to the load current of the electronic device from this estimated terminal voltage is newly set as the set value.
【００１９】検出された端子電圧がこのようにして得ら
れた設定値より小さい場合は、メモリ効果が発生してい
ると判断し、制御回路１１はニッケルカドミウム電池４
から疑似抵抗（図示省略）を解放し代わりに放電抵抗
（図示省略）を接続して、ニッケルカドミウム電池４を
強制放電（リフレッシュ動作）させる（ステップ２
２）。なお、疑似抵抗（図示省略）と放電抵抗（図示省
略）とを共用しても、また疑似抵抗（図示省略）に新た
に放電抵抗（図示省略）を並列接続しても同じ効果が得
られることは言うまでもなく、電池容量と放電時間から
求められる適切な放電抵抗値に設計されていれば良い。When the detected terminal voltage is smaller than the set value thus obtained, it is judged that the memory effect is occurring, and the control circuit 11 causes the nickel cadmium battery 4 to operate.
, A pseudo resistor (not shown) is released, and a discharge resistor (not shown) is connected instead, and the nickel-cadmium battery 4 is forcibly discharged (refresh operation) (step 2).
2). It should be noted that the same effect can be obtained even if the pseudo resistor (not shown) and the discharge resistor (not shown) are shared, or if a new discharge resistor (not shown) is connected in parallel to the pseudo resistor (not shown). Needless to say, it may be designed to have an appropriate discharge resistance value obtained from the battery capacity and the discharge time.
【００２０】一方、ステップ２１で端子電圧が設定値以
上であった場合、またはステップ２２のリフレッシュ動
作が終了した場合は、制御回路１１はニッケルカドミウ
ム電池４から放電抵抗（図示省略）を解放し充電回路２
へ接続する制御を行って充電動作が開始される（ステッ
プ２３）。On the other hand, if the terminal voltage is equal to or higher than the set value in step 21, or if the refresh operation in step 22 is completed, the control circuit 11 releases the discharge resistor (not shown) from the nickel-cadmium battery 4 to charge it. Circuit 2
The charging operation is started by controlling the connection to (step 23).
【００２１】このようにして、ニッケルカドミウム電池
４がメモリー効果を発生した場合のみリフレッシュを行
うので、充電に要する時間を短縮でき、かつ電池のサイ
クル寿命も大幅に延ばすことができる。In this way, since the refreshing is performed only when the nickel-cadmium battery 4 produces a memory effect, the time required for charging can be shortened and the cycle life of the battery can be greatly extended.
【００２２】なお、ステップ２０から２３の間において
電子機器はＡＣアダプタによって電源供給されているの
で、使用者は充放電動作を意識することなく電子機器を
使用し続けることができ、電子機器の利便性を大幅に改
善することができた。Since the electronic device is powered by the AC adapter between steps 20 and 23, the user can continue to use the electronic device without being aware of the charging / discharging operation, which is convenient for the electronic device. It was possible to greatly improve the sex.
【００２３】[0023]
【発明の効果】以上のように本発明は、充電しようとす
るニッケルカドミウム電池がメモリー効果を発生した場
合のみリフレッシュを行うので、充電を行う度にリフレ
ッシュを行う従来の充電制御方法に比較して、リフレッ
シュを行う頻度が著しく低下する。この結果、充電に要
する時間を短縮することができ、かつ電池のサイクル寿
命も大幅に延ばすことができるものである。As described above, according to the present invention, the refreshing is performed only when the nickel-cadmium battery to be charged has a memory effect, so that the conventional charging control method is performed every time the charging is performed. , The frequency of refresh is significantly reduced. As a result, the time required for charging can be shortened and the cycle life of the battery can be greatly extended.
【図１】本発明の一実施例における充電装置のブロック
図FIG. 1 is a block diagram of a charging device according to an embodiment of the present invention.
【図２】本発明の一実施例における充電制御方法のフロ
ーチャートFIG. 2 is a flowchart of a charging control method according to an embodiment of the present invention.
【図３】従来の充電装置のブロック図FIG. 3 is a block diagram of a conventional charging device.
【図４】従来の充電制御方法のフローチャートFIG. 4 is a flowchart of a conventional charging control method.
１ 電圧検出回路 ２ 充電回路 ３ 放電回路 ４ ニッケルカドミウム電池 １１ 制御回路 １２ 記憶素子 １３ 演算手段 DESCRIPTION OF SYMBOLS 1 Voltage detection circuit 2 Charging circuit 3 Discharging circuit 4 Nickel cadmium battery 11 Control circuit 12 Storage element 13 Computing means
フロントページの続き (72)発明者 武内 清 大阪府門真市大字門真1006番地 松下電器 産業株式会社内Front page continuation (72) Inventor Kiyoshi Takeuchi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.
Claims (4)
と、前記電池を強制的に放電させる放電手段と、前記電
池を充電する充電手段と、前記電池の充放電に関する来
歴データを記憶する記憶手段と、前記端子電圧と前記来
歴データとから推定残存容量を算出する演算手段と、前
記記憶手段と前記演算手段とから得られた情報に基づき
前記充電手段と前記放電手段とを制御する制御手段とを
有し、前記電圧検出手段によって検出された前記電池の
端子電圧が推定残存容量から実際に消費した電池容量に
相当する推定端子電圧に比べ低い場合には前記放電手段
によって放電した後に前記充電手段によって充電をし、
端子電圧が推定端子電圧に比べ同じか高い場合には前記
充電手段によって充電をするように制御することを特徴
とする充電制御方法。1. A voltage detecting means for detecting a terminal voltage of a battery, a discharging means for forcibly discharging the battery, a charging means for charging the battery, and a memory for storing history data concerning charge / discharge of the battery. Means, an arithmetic means for calculating the estimated remaining capacity from the terminal voltage and the history data, and a control means for controlling the charging means and the discharging means on the basis of information obtained from the storage means and the arithmetic means. When the terminal voltage of the battery detected by the voltage detecting means is lower than the estimated terminal voltage corresponding to the battery capacity actually consumed from the estimated remaining capacity, the charging is performed after discharging by the discharging means. Charging by means,
A charging control method characterized in that when the terminal voltage is equal to or higher than the estimated terminal voltage, charging is performed by the charging means.
と、前記電池を強制的に放電させる放電手段と、前記電
池を充電する充電手段と、前記電池の充放電に関する来
歴データを記憶する記憶手段と、前記端子電圧と前記来
歴データとから推定残存容量を算出する演算手段と、前
記記憶手段と前記演算手段とから得られた情報に基づき
前記充電手段と前記放電手段とを制御する制御手段とを
有し、前記制御手段は、前記電圧検出手段によって検出
された前記電池の端子電圧が推定残存容量から実際に消
費した電池容量に相当する推定端子電圧に比べ低い場合
には前記放電手段によって放電した後に前記充電手段に
よって充電をし、端子電圧が推定端子電圧に比べ同じか
高い場合には前記充電手段によって充電をするように制
御することを特徴とする充電装置。2. A voltage detecting means for detecting a terminal voltage of a battery, a discharging means for forcibly discharging the battery, a charging means for charging the battery, and a memory for storing history data concerning charge / discharge of the battery. Means, an arithmetic means for calculating the estimated remaining capacity from the terminal voltage and the history data, and a control means for controlling the charging means and the discharging means on the basis of information obtained from the storage means and the arithmetic means. And the control means, when the terminal voltage of the battery detected by the voltage detection means is lower than the estimated terminal voltage corresponding to the battery capacity actually consumed from the estimated remaining capacity, by the discharge means. After discharging, charging is performed by the charging means, and when the terminal voltage is equal to or higher than the estimated terminal voltage, control is performed so that charging is performed by the charging means. That the charging device.
ことを特徴とする請求項１記載の充電制御方法。3. The charge control method according to claim 1, wherein the battery is a nickel-cadmium battery.
ことを特徴とする請求項２記載の充電装置。4. The charging device according to claim 2, wherein the battery is a nickel-cadmium battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05047593A JP3328987B2 (en) | 1993-03-11 | 1993-03-11 | Charging control method and charging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05047593A JP3328987B2 (en) | 1993-03-11 | 1993-03-11 | Charging control method and charging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06269131A true JPH06269131A (en) | 1994-09-22 |
| JP3328987B2 JP3328987B2 (en) | 2002-09-30 |
Family
ID=12859928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05047593A Expired - Fee Related JP3328987B2 (en) | 1993-03-11 | 1993-03-11 | Charging control method and charging device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3328987B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7030590B2 (en) | 2002-03-25 | 2006-04-18 | Makita Corporation | Apparatus for refreshing batteries |
| GB2509530A (en) * | 2013-01-07 | 2014-07-09 | Kidde Tech Inc | Optical fiber temperature sensing system having a deformable shape memory alloy |
-
1993
- 1993-03-11 JP JP05047593A patent/JP3328987B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7030590B2 (en) | 2002-03-25 | 2006-04-18 | Makita Corporation | Apparatus for refreshing batteries |
| GB2509530A (en) * | 2013-01-07 | 2014-07-09 | Kidde Tech Inc | Optical fiber temperature sensing system having a deformable shape memory alloy |
| GB2509530B (en) * | 2013-01-07 | 2015-11-11 | Kidde Tech Inc | Optical fibre distributed LHD with SMA element for discrete alarm |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3328987B2 (en) | 2002-09-30 |
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