JP2844763B2 - Electronic device with battery level notification function - Google Patents
Electronic device with battery level notification functionInfo
- Publication number
- JP2844763B2 JP2844763B2 JP1320834A JP32083489A JP2844763B2 JP 2844763 B2 JP2844763 B2 JP 2844763B2 JP 1320834 A JP1320834 A JP 1320834A JP 32083489 A JP32083489 A JP 32083489A JP 2844763 B2 JP2844763 B2 JP 2844763B2
- Authority
- JP
- Japan
- Prior art keywords
- battery
- remaining amount
- operation mode
- electronic device
- mode
- 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.)
- Expired - Fee Related
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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
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、電池の残量を推定し、使用者に報知する電
池残量報知機能を有する電子機器に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device having a battery remaining amount notification function for estimating a remaining amount of a battery and informing a user of the remaining amount.
［従来の技術］ この種の電池残量演算装置としては、使用状態に応じ
た消費電力量を使用時間に応じて積算し、フル充電の電
力量からこれを減算して残量を推定する装置が知られて
いる。第６図は、カメラ一体型ビデオ・テープ・レコー
ダ（所謂、カムコーダ）に適用した構成例を示す。10は
カメラ部、12はVTR部、14はカメラ部10及びVTR部12に電
力を供給するバッテリ、16はカメラ部10及びVTR部12の
動作を制御するシステム制御回路、18はシステム制御回
路16に所定の指示を入力する指示部、20はシステム制御
回路16の動作状態を表示する表示部、22は消費電力を積
算するためのカウンタである。24はカメラ部10又はVTR
部12の再生映像を表示するTV装置である。2. Description of the Related Art As this kind of battery remaining amount calculating device, a device that accumulates power consumption according to a use state according to a use time, and subtracts this from a fully charged power amount to estimate a remaining amount. It has been known. FIG. 6 shows a configuration example applied to a camera-integrated video tape recorder (so-called camcorder). 10 is a camera unit, 12 is a VTR unit, 14 is a battery that supplies power to the camera unit 10 and the VTR unit 12, 16 is a system control circuit that controls the operation of the camera unit 10 and the VTR unit 12, and 18 is a system control circuit 16. Is a display unit for displaying the operation state of the system control circuit 16, and 22 is a counter for integrating power consumption. 24 is the camera unit 10 or VTR
It is a TV device that displays the playback video of the unit 12.
第６図のカムコーダは例えば、撮影記録モードでは、
カメラ部10及びVTR部12が共に動作状態にあり、消費電
流が2.4Aであり、再生モードでは、カメラ部10は停止
し、VTR部12のみが動作して、消費電流は1.8Aである。The camcorder shown in FIG.
The camera unit 10 and the VTR unit 12 are both in operation, and the current consumption is 2.4 A. In the playback mode, the camera unit 10 stops, only the VTR unit 12 operates, and the current consumption is 1.8 A.
操作者が指示部18により撮影記録モードの指示を入力
すると、カメラ部10及び／又はVTR部12にバッテリ14か
ら給電され、指定された動作モードに応じた動作が開始
する。これと同時に、カウンタ22は、各動作モードに応
じた単位時間当たりのカウント値を累積する。When the operator inputs an instruction of the photographing / recording mode by the instruction unit 18, the camera unit 10 and / or the VTR unit 12 are supplied with power from the battery 14, and the operation according to the specified operation mode is started. At the same time, the counter 22 accumulates a count value per unit time according to each operation mode.
つまり、各動作モードの消費電力に応じたカウント係
数を設定しておき、システム制御回路16は動作モードに
応じてカウンタ22を制御する。上記の例では、撮影記録
モードと再生モードで消費電流が夫々2.4A,1.8Aである
ので、夫々のカウント係数を“4",“3"とする。カウン
タ22は撮影記録モードでは、１秒間に４ずつカウント・
アップし、再生モードでは１秒間に３ずつカウント・ア
ップする。That is, a count coefficient corresponding to the power consumption of each operation mode is set, and the system control circuit 16 controls the counter 22 according to the operation mode. In the above example, since the current consumption is 2.4 A and 1.8 A in the shooting recording mode and the reproduction mode, respectively, the count coefficients are set to “4” and “3”, respectively. The counter 22 counts four at a time in the recording mode.
In playback mode, the count is incremented by three per second.
システム制御回路16は、カメラ部10及びVTR部12から
なる主動作部13が動作を停止又は中断する度に、カウン
タ22の保持値を取り込み、この保持値からバッテリ14の
消費電力を演算により求め、残量を表示部20により表示
する。カウンタ22はバッテリ14の交換時にリセットされ
る。The system control circuit 16 fetches the value held by the counter 22 every time the main operation unit 13 including the camera unit 10 and the VTR unit 12 stops or suspends the operation, and calculates the power consumption of the battery 14 from the held value by calculation. The remaining amount is displayed on the display unit 20. The counter 22 is reset when the battery 14 is replaced.
このようにして求めた残量を撮影記録モードの消費電
流で除算することにより、撮影可能な記録時間を求めて
表示できる。By dividing the remaining amount thus obtained by the current consumption in the shooting and recording mode, it is possible to obtain and display the recording time in which shooting is possible.
［発明が解決しようとする課題］ しかし上記従来例では、使用状態の切換え時や細かい
モード設定の違いからくる消費電力の誤差が積み重な
り、高い精度を得ることができない。また、途中まで使
用した電池の場合には、残量を全く推定できないという
欠点がある。[Problems to be Solved by the Invention] However, in the above-described conventional example, errors in power consumption due to switching of the use state and differences in fine mode settings are accumulated, and high accuracy cannot be obtained. Further, in the case of a partially used battery, there is a disadvantage that the remaining amount cannot be estimated at all.
そこで本発明は、より高い精度で電池の残量を推定
し、使用者に報知することができる電池残量報知機能を
有する電子機器を提供することを目的とする。Therefore, an object of the present invention is to provide an electronic device having a battery remaining amount notification function capable of estimating the remaining amount of a battery with higher accuracy and notifying the user of the remaining amount.
［課題を解決するための手段］ 本発明に係る電池残量報知機能を有する電子機器は、
互いに負荷抵抗が異なる複数種の動作モードを有し、電
池を電源として動作する電子機器であって、前記電子機
器の動作モードの変更に伴う前記電池の出力の変化に従
って前記電池の残量を検出すると共に、同じ動作モード
の継続時間を計測しつつ、前記動作モードが他の動作モ
ードに移行せずに所定時間連続して実行された場合に
は、同じ動作モードの継続時間に伴って算出される電池
消費量に従って検出された前記電池の残量を補正し、補
正された電池の残量に関連した情報を使用者に報知する
機能を備えたことを特徴とする。[Means for Solving the Problems] An electronic device having a battery remaining amount notification function according to the present invention includes:
An electronic device having a plurality of operation modes having different load resistances and operating on a battery as a power source, and detecting a remaining amount of the battery according to a change in the output of the battery accompanying a change in an operation mode of the electronic device. In addition, while measuring the duration of the same operation mode, if the operation mode is continuously executed for a predetermined time without shifting to another operation mode, the calculation is performed with the duration of the same operation mode. And a function of correcting the detected remaining amount of the battery according to the amount of battery consumption, and notifying a user of information related to the corrected remaining amount of the battery.
［作用］ 上述の構成により、精度よく電池の残量を推定し、使
用者に報知することができるようになる。[Operation] With the above-described configuration, the remaining amount of the battery can be accurately estimated and notified to the user.
［実施例］ 以下、図面を参照して本発明の実施例を説明する。Embodiment An embodiment of the present invention will be described below with reference to the drawings.
第１図は本発明の一実施例の構成ブロック図である。
30はカメラ部、32はVTR部、34はカメラ部30及びVTR部32
に夫々スイッチ36,38を介して電力を供給する電池、40
はカメラ部30及びVTR部32の動作並びに、スイッチ36,38
の開閉を制御するシステム制御回路、42はシステム制御
回路40に所定の動作指示を入力するための指示装置、44
は電池34の出力電圧を測定する測定回路、46は測定回路
44の出力及びシステム制御回路40からの動作信号により
電池34の残量を演算する演算回路、48は演算回路46で算
出された電池残量を表示する表示装置である。FIG. 1 is a configuration block diagram of one embodiment of the present invention.
30 is a camera unit, 32 is a VTR unit, 34 is a camera unit 30 and a VTR unit 32
Batteries that supply power via switches 36 and 38 to
Are the operations of the camera unit 30 and the VTR unit 32 and the switches 36 and 38
A system control circuit for controlling the opening and closing of the device; 42, an instruction device for inputting a predetermined operation instruction to the system control circuit 40;
Is a measurement circuit for measuring the output voltage of the battery 34, and 46 is a measurement circuit
An arithmetic circuit for calculating the remaining amount of the battery 34 based on the output of 44 and the operation signal from the system control circuit 40, and a display device 48 for displaying the remaining battery amount calculated by the arithmetic circuit 46.
本実施例では、測定しようとする電池34に２種類の負
荷を選択的に接続してそれぞれの内部起電圧（開路電
圧）ｖを測定し、別に実験で求めた内部起電圧対残量の
特性曲線との対比により、電池34の残量を推定する。即
ち、第２図の回路により各消耗状態での電池34の内部抵
抗Ｒ、内部起電圧ｖ、出力電圧Ｖ及び出力電流Ｉの関係
を測定する。r1,r2は測定用の負荷抵抗、50は負荷抵抗r
1,r2を選択するためのスイッチである。r1は例えば録画
モードでの負荷抵抗であり、r2は他のモードでの負荷抵
抗である。スイッチ50を負荷r1に接続した場合の電流を
I1、負荷r1による電圧降下をV1、スイッチ50を負荷r2に
接続した場合の電流をI2、負荷r2による電圧降下をV2と
すると、 Ｒ＝（V2−V1）／（I1−I2） （１） であり、電池34の出力電圧をＶ、出力電流をＩとする
と、 ｖ＝Ｖ＋IR （２） であるから、 ｖ＝Ｖ＋Ｉ（V2−V1）／（I1−I2） （３） となる。In the present embodiment, two types of loads are selectively connected to the battery 34 to be measured, and the respective internal electromotive voltages (open circuit voltages) v are measured. The remaining amount of the battery 34 is estimated based on the comparison with the curve. That is, the relationship between the internal resistance R, the internal electromotive voltage v, the output voltage V, and the output current I of the battery 34 in each consumed state is measured by the circuit of FIG. r 1 and r 2 are the load resistance for measurement, 50 is the load resistance r
1 is a switch for selecting the r 2. r 1 is the load resistance of, for example, recording mode, r 2 is the load resistance in the other modes. The current in the case of connecting the switch 50 to the load r 1
Assuming that I 1 , the voltage drop due to the load r 1 is V 1 , the current when the switch 50 is connected to the load r 2 is I 2 , and the voltage drop due to the load r 2 is V 2 , R = (V 2 −V 1 ) / (I 1 −I 2 ) (1) When the output voltage of the battery 34 is V and the output current is I, v = V + IR (2), and v = V + I (V 2 −V 1 ) / (I 1 −I 2 ) (3)
内部起電圧ｖは内部抵抗Ｒの影響をあまり受けないの
で比較的変動が少なく、電池容量の残量とよく対応す
る、内部起電圧ｖと電池残量との関係曲線を予め求めて
おき、使用中に適当なタイミングで上記I1,I2,V1,V2,V,
Iを測定し、これによって算出された内部起電圧ｖを当
該関係曲線に当てはめれば、その時点での電池残量を推
定できる。Since the internal electromotive voltage v is not greatly affected by the internal resistance R, the variation is relatively small, and a relationship curve between the internal electromotive voltage v and the remaining battery level, which corresponds well to the remaining battery capacity, is obtained in advance and used. During the above, I 1 , I 2 , V 1 , V 2 , V,
By measuring I and applying the calculated internal electromotive voltage v to the relation curve, the remaining battery level at that time can be estimated.
一例として、カメラ撮影の記録モードにおける連続使
用を想定し、電池残量を使用可能時間に換算した値Ｔで
表示する場合を例に、より具体的に説明する。As an example, a more specific description will be given, taking as an example a case in which continuous use in a recording mode of camera photographing is assumed and the remaining battery power is displayed as a value T converted into usable time.
カムコーダで使用する各電池について、内部起電圧ｖ
と上記使用可能時間Ｔ（残量）の対応関係を示す特性曲
線を測定しておく。この場合、精度を上げるために、使
用する可能性のある同一又は複数タイプの複数の電池で
の測定値を平均化して、上記特性曲線を求める。第５図
は、Ni−Cd2次電池の場合の特性曲線を示す。この特性
曲線のデータを演算回路46のメモリに格納しておく。For each battery used in the camcorder, the internal electromotive voltage v
A characteristic curve showing the correspondence between the above and the usable time T (remaining amount) is measured in advance. In this case, in order to improve the accuracy, the characteristic values are obtained by averaging the measured values of a plurality of batteries of the same or a plurality of types that may be used. FIG. 5 shows a characteristic curve in the case of a Ni-Cd secondary battery. The data of the characteristic curve is stored in the memory of the arithmetic circuit 46.
なお、別の動作モードにおける残量値を推定したい場
合には、その消費電池に応じた係数ｋを上記Ｔに乗算す
ればよい。When it is desired to estimate the remaining amount in another operation mode, T may be multiplied by a coefficient k corresponding to the consumed battery.
次に、第３図及び第４図を参照して、残量表示の処理
手順を説明する。電源投入でスタートし、先ず、動作モ
ード（Ｍ）をストップ・モードに設定し（S1）、先ず、
測定回路44で電池34の出力電圧V1を測定し、ストップ・
モードに対応した出力電流I1を演算回路46で求める（S
2）。次に、記録ポーズ状態にし（S3）、測定回路44で
電池34の出力電圧V2を測定し、記録モードに対応する電
流値I2を演算回路46で求める（S4）。そして、式（３）
からｖを求め、特性曲線から残量Ｔを求める（S5）。Next, referring to FIGS. 3 and 4, a description will be given of the processing procedure of the remaining amount display. The operation starts when the power is turned on. First, the operation mode (M) is set to the stop mode (S1).
In the measuring circuit 44 measures the output voltage V 1 of the battery 34, stop
The output current I 1 corresponding to the mode is obtained by the arithmetic circuit 46 (S
2). Then, the recording pause state (S3), measuring the output voltage V 2 of the battery 34 in the measurement circuit 44 obtains a current value I 2 corresponding to the recording mode by the arithmetic circuit 46 (S4). And equation (3)
From the characteristic curve, and the remaining amount T from the characteristic curve (S5).
モードが変更されたか否かを調べ（S6）、変更されれ
ば、タイマをリセットし（S10）、変更されなければ、
タイマのカウントを開始し（S7）、所定時間が経過する
まで、S6〜８を循環する（S8）。所定時間経過したらフ
ラグＦを１にセットし、タイマをリセットする（S1
0）。フラグＦは積算演算処理を行なうか、又は再計算
処理を行なうかを示すフラグであり、同一処理が所定時
間連続すると、Ｆ＝１になって後述する積算演算処理に
進み、モードがそのままの場合には、フラグＦは０のま
まで再計算処理に進む。Check whether the mode has been changed (S6), and if changed, reset the timer (S10).
The timer starts counting (S7), and circulates through S6 to S8 until a predetermined time elapses (S8). After a predetermined time has elapsed, the flag F is set to 1 and the timer is reset (S1
0). The flag F is a flag indicating whether to perform the integration processing or the recalculation processing. If the same processing continues for a predetermined time, F = 1, the processing proceeds to the integration calculation processing described later, and the mode remains unchanged. , The process proceeds to the recalculation process while the flag F remains 0.
タイマのリセット後（S10）、モードを確認し（S1
1）、各モード（ストップ、記録、記録ポーズ）に応じ
て、消耗値を残量換算した値を変数ｔにセットし（S12,
13,14）、モードに応じた電流値Ia,Ib,Icを変数Ｉにセ
ットする（S15,16,17）。その後フラグＦに従い（S1
8）、Ｆ＝１（積算演算処理）の場合、先ず、フラグＦ
を０に戻し（S19）、現在の残量値Ｔから消耗量ｔを減
算し（S20）、最新の残量値Ｔを表示する（S21）。Ｆ＝
０（再計算処理）の場合（S18）、モード変更後の出力
電圧Ｖを測定し（S22）、最新の残量値Ｔを演算する（S
23）。ここでは、式（３）に代入するI1,V1とI2,V2は交
換される。以降、同様に、Ｔ演算のステップでは、添え
字の“1"と“2"は随時交換されるものとする。S23の
後、演算された残量値Ｔが表示される（S21）。After resetting the timer (S10), check the mode (S1
1) In accordance with each mode (stop, recording, recording pause), a value obtained by converting the consumption value into the remaining amount is set in a variable t (S12,
13, 14), and set the current values Ia, Ib, Ic according to the mode to the variable I (S15, 16, 17). Then, according to the flag F (S1
8) When F = 1 (integration calculation processing), first, the flag F
Is returned to 0 (S19), the consumption amount t is subtracted from the current remaining amount T (S20), and the latest remaining amount T is displayed (S21). F =
In the case of 0 (recalculation processing) (S18), the output voltage V after the mode change is measured (S22), and the latest remaining value T is calculated (S22).
twenty three). Here, I 1 , V 1 and I 2 , V 2 substituted in the equation (3) are exchanged. Thereafter, similarly, in the T operation step, the suffixes “1” and “2” are exchanged as needed. After S23, the calculated remaining amount value T is displayed (S21).
S21の後はS6に戻り、S6以降のステップが循環的に実
行される。After S21, the process returns to S6, and the steps after S6 are cyclically executed.
モード変更（S6）があれば、強制的にタイマ・リセッ
ト（S7）を行なうことにより、残量の表示値としては、
再計算値が優先されることになる。If there is a mode change (S6), a timer reset (S7) is forcibly performed, and the display value of the remaining amount is as follows.
The recalculated value will have priority.
第４図は実際の動作時のモード遷移とそれに伴うタイ
マ・カウンタ、表示残量値の変化を図示したものであ
る。上段がモード遷移を示し、その下がタイマ・カウン
タのリセットとオーバーフローのタイミング、その下の
グラフが表示された残量値Ｔの時間変化である。残量値
Ｔにおける段差t2は記録時の代表減算値であり、t3は記
録ポーズ時の代表減算値である。時間経過に応じて同一
モード期間内での減算が行なわれているのが分かる。FIG. 4 illustrates a mode transition during an actual operation and a change in a timer / counter and a remaining display value accompanying the mode transition. The upper part shows the mode transition, the lower part shows the timing of resetting and overflow of the timer / counter, and the lower part shows the time change of the remaining amount value T displayed on the graph below. The step t2 in the remaining amount value T is a representative subtraction value during recording, and t3 is a representative subtraction value during recording pause. It can be seen that the subtraction is performed within the same mode period as time passes.
［発明の効果］ 以上の説明から容易に理解できるように、本発明によ
れば、より高い精度で電池の残量を推定し、使用者に報
知することができる電池残量報知機能を有する電子機器
を提供することができる。[Effects of the Invention] As can be easily understood from the above description, according to the present invention, an electronic device having a battery remaining amount notification function capable of estimating the remaining amount of the battery with higher accuracy and notifying the user of the estimated remaining amount. Equipment can be provided.
第１図は本発明の一実施例の構成ブロック図、第２図は
本実施例の動作原理の説明用回路、第３図は本実施例の
動作フローチャート、第４図は動作説明用のタイミング
・チャート、第５図は電池の内部起電圧対残量の特性曲
線、第６図は従来例の構成ブロック図である。 30:カメラ部、32:VTR部、34:電池、40:システム制御回
路、42:指示装置、44:測定回路、46:演算回路、48:表示
装置FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a circuit for explaining the operation principle of this embodiment, FIG. 3 is an operation flowchart of this embodiment, and FIG. Chart, FIG. 5 is a characteristic curve of the internal electromotive voltage of the battery versus the remaining amount, and FIG. 6 is a block diagram of the configuration of the conventional example. 30: camera unit, 32: VTR unit, 34: battery, 40: system control circuit, 42: pointing device, 44: measuring circuit, 46: arithmetic circuit, 48: display device
───────────────────────────────────────────────────── フロントページの続き (72)発明者 戸辺 和光 神奈川県川崎市高津区下野毛770番地 キヤノン株式会社玉川事業所内 (72)発明者 佐伯 孝幸 神奈川県川崎市高津区下野毛770番地 キヤノン株式会社玉川事業所内 (56)参考文献 特開 昭59−211979（ＪＰ，Ａ) 特開 昭61−209373（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) H04N 5/222 - 5/257 H01M 10/42 - 10/48 H02J 7/00 - 7/12──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Wako Tobe 770 Shimonoge, Takatsu-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Tamagawa Office of Canon Inc. In-house (56) References JP-A-59-211979 (JP, A) JP-A-61-209373 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) H04N 5 / 222-5 / 257 H01M 10/42-10/48 H02J 7/00-7/12
Claims (1)
ドを有し、電池を電源として動作する電子機器であっ
て、 前記電子機器の動作モードの変更に伴う前記電池の出力
の変化に従って前記電池の残量を検出すると共に、同じ
動作モードの継続時間を計測しつつ、前記動作モードが
他の動作モードに移行せずに所定時間連続して実行され
た場合には、同じ動作モードの継続時間に伴って算出さ
れる電池消費量に従って検出された前記電池の残量を補
正し、補正された電池の残量に関連した情報を使用者に
報知する機能を備えたことを特徴とする電池残量報知機
能を有する電子機器。An electronic device having a plurality of types of operation modes having different load resistances and operating with a battery as a power supply, wherein the battery is operated in accordance with a change in output of the battery accompanying a change in an operation mode of the electronic device. If the operation mode is continuously executed for a predetermined time without shifting to another operation mode while detecting the remaining amount of the same operation mode and measuring the duration of the same operation mode, the duration of the same operation mode A function of correcting the detected remaining amount of the battery according to the battery consumption calculated in accordance with the above, and notifying a user of information related to the corrected remaining amount of the battery. An electronic device that has a mass notification function.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1320834A JP2844763B2 (en) | 1989-12-11 | 1989-12-11 | Electronic device with battery level notification function |
| EP90123690A EP0432689B1 (en) | 1989-12-11 | 1990-12-10 | Remaining-amount-of-battery detecting device |
| DE69030063T DE69030063T2 (en) | 1989-12-11 | 1990-12-10 | Battery residual charge determination arrangement |
| US07/968,250 US6150823A (en) | 1989-12-11 | 1992-10-29 | Battery charge detecting variable loads |
| US09/615,207 US6232747B1 (en) | 1989-12-11 | 2000-07-13 | Remaining-amount-of-battery detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1320834A JP2844763B2 (en) | 1989-12-11 | 1989-12-11 | Electronic device with battery level notification function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03182176A JPH03182176A (en) | 1991-08-08 |
| JP2844763B2 true JP2844763B2 (en) | 1999-01-06 |
Family
ID=18125760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1320834A Expired - Fee Related JP2844763B2 (en) | 1989-12-11 | 1989-12-11 | Electronic device with battery level notification function |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2844763B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101451395B1 (en) * | 2013-12-02 | 2014-10-22 | 주식회사 아임삭 | Apparatus for managing battery of electronic tool |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990054064A (en) * | 1997-12-24 | 1999-07-15 | 윤종용 | How to display the battery level of video camera |
| CN110829852B (en) * | 2019-12-06 | 2024-06-14 | 贵州电网有限责任公司 | DC power supply open-circuit monitoring and output voltage self-healing compensation device |
| JP7381428B2 (en) * | 2020-09-30 | 2023-11-15 | 株式会社ブリヂストン | Tire condition monitoring system, battery discharge capacity estimation program, and discharge capacity estimation method |
| CN113050739A (en) * | 2021-03-09 | 2021-06-29 | 深圳市航顺芯片技术研发有限公司 | System and method for automatically identifying chip power supply voltage |
-
1989
- 1989-12-11 JP JP1320834A patent/JP2844763B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101451395B1 (en) * | 2013-12-02 | 2014-10-22 | 주식회사 아임삭 | Apparatus for managing battery of electronic tool |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03182176A (en) | 1991-08-08 |
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