JP2894031B2 - Battery level warning device - Google Patents
Battery level warning deviceInfo
- Publication number
- JP2894031B2 JP2894031B2 JP3227771A JP22777191A JP2894031B2 JP 2894031 B2 JP2894031 B2 JP 2894031B2 JP 3227771 A JP3227771 A JP 3227771A JP 22777191 A JP22777191 A JP 22777191A JP 2894031 B2 JP2894031 B2 JP 2894031B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- discharge current
- operational amplifier
- battery
- current
- 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
Links
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Emergency Alarm Devices (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は携帯用電子機器の電源で
ある２次電池の電池残量警報装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery level warning device for a secondary battery which is a power source of a portable electronic device.
【０００２】[0002]
【従来の技術】電池残量警報装置は、コスト的に有利な
電池電圧検出型が一般的であり、携帯機器本体または電
池パックに内蔵され使用されている（例えば特開平１−
１００４７９号公報）。2. Description of the Related Art Battery level alarms are generally of the battery voltage detection type, which is advantageous in terms of cost.
No. 100479).
【０００３】以下に従来の電池残量警報装置について図
面を用いて説明する。図４は従来の電池残量警報装置の
構成を示す回路図である。図４において１は２次電池、
４は電池電圧検出手段で、比較器４１とその入力で所定
の基準電圧を発生させる抵抗４２と抵抗４３からなる第
１の分圧回路と、前記比較器４１のもう一方の入力で電
池電圧を分圧する抵抗４４と抵抗４５からなる第２の分
圧回路とで構成されている。５は表示手段で前記比較器
４１の出力を入力とし、警報動作を行う。６は負荷で携
帯機器に相当する。A conventional battery level warning device will be described below with reference to the drawings. FIG. 4 is a circuit diagram showing the configuration of a conventional battery level warning device. In FIG. 4, 1 is a secondary battery,
Reference numeral 4 denotes a battery voltage detecting means, a first voltage dividing circuit including a comparator 41 and a resistor 42 and a resistor 43 for generating a predetermined reference voltage at the input thereof, and a battery voltage detecting means at the other input of the comparator 41. A second voltage dividing circuit including a resistor 44 for dividing the voltage and a resistor 45 is provided. Reference numeral 5 denotes a display unit which receives an output of the comparator 41 and performs an alarm operation. Reference numeral 6 denotes a load corresponding to a portable device.
【０００４】以上のように構成された電池残量警報装置
について、以下その動作を説明する。[0004] The operation of the battery level alarm device configured as described above will be described below.
【０００５】まず、負荷６が動作することにより２次電
池１は放電状態となり、その電圧は徐々に低下する。こ
の電池電圧は電池電圧を分圧する第２の分圧回路と所定
の基準電圧を発生させる第１の分圧回路のそれぞれの分
圧点電圧を入力とする比較器４１にて監視されており、
電池電圧が所定値以下になった時に比較器４１より信号
が送出される。表示手段５は比較器４１より出力される
信号により電池残量が残り少ないことを意味する警報表
示を行う。First, the operation of the load 6 causes the secondary battery 1 to be discharged, and the voltage thereof gradually decreases. This battery voltage is monitored by a comparator 41 which receives as input the respective voltage dividing point voltages of a second voltage dividing circuit for dividing the battery voltage and a first voltage dividing circuit for generating a predetermined reference voltage.
A signal is sent from the comparator 41 when the battery voltage falls below a predetermined value. The display means 5 performs an alarm display indicating that the remaining battery level is low based on a signal output from the comparator 41.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら前記の構
成では、警報検出が電池電圧でのみ行われるので、カメ
ラ一体型ビデオやワープロや携帯電話といった放電電流
が変動し、これにより電池電圧も変動する場合では警報
検出時の残量値がその時の放電電流値により大きく異な
り、正確な電池残量警報にならないという問題があっ
た。図３は放電電流の大小による電池電圧と警報検出電
圧の関係を示す特性図で、警報検出電圧を放電電流によ
らず一定とした場合には、放電電流の大小による残量値
が大きく異なることを示している。However, in the above configuration, since the alarm detection is performed only on the battery voltage, the discharge current of a camera-integrated video, a word processor or a mobile phone fluctuates. In this case, there is a problem that the remaining battery value at the time of alarm detection greatly differs depending on the discharge current value at that time, and an accurate battery remaining battery alarm is not obtained. FIG. 3 is a characteristic diagram showing the relationship between the battery voltage and the alarm detection voltage according to the magnitude of the discharge current. When the alarm detection voltage is constant irrespective of the discharge current, the residual value greatly differs depending on the magnitude of the discharge current. Is shown.
【０００７】本発明は、上記問題点を解決するもので、
警報検出時の残量値が放電電流値によらずほぼ一定であ
る電池残量警報装置を提供することを目的とする。The present invention solves the above problems,
It is an object of the present invention to provide a remaining battery level alarm device in which the remaining level at the time of alarm detection is substantially constant regardless of the discharge current value.
【０００８】[0008]
【課題を解決するための手段】この目的を達成するため
に本発明の電池残量警報装置は、放電電流を微少電圧に
変換する電流検出抵抗と、この抵抗の両端に発生する微
少電圧に比例した微少電流を出力する放電電流補正手段
と、この微少電流を電池電圧の分圧回路の分圧点に入力
し、分圧点電圧と所定の基準電圧とを比較し、電池電圧
の低下を検出する電池電圧検出手段と、この出力信号に
より警報表示を行う表示手段とを備えた構成を有してい
る。そして、放電電流補正手段として、演算増幅器と、
前記演算増幅器の入力抵抗と、ベースが前記演算増幅器
の出力に接続され第１のコレクタが前記演算増幅器の非
反転入力に接続され第２のコレクタが前記放電電流補正
手段の出力であるカレントミラー回路もしくは演算増幅
器と、前記演算増幅器の入力抵抗と、ベースが前記演算
増幅器の出力に接続されエミッタが前記演算増幅器の反
転入力に接続されコレクタが前記放電電流補正手段の出
力であるＰＮＰ型のトランジスタとを備えた構成を有し
ている。 In order to achieve the above object, a battery remaining amount alarm device according to the present invention comprises a current detecting resistor for converting a discharge current into a minute voltage, and a current detecting resistor proportional to a minute voltage generated at both ends of the resistor. Discharge current correcting means for outputting a minute current, and inputting the minute current to a dividing point of a battery voltage dividing circuit, and comparing the dividing point voltage with a predetermined reference voltage to detect a decrease in the battery voltage. And a display means for displaying an alarm based on the output signal. And an operational amplifier as discharge current correction means,
The input resistance of the operational amplifier and the base are the operational amplifier
And a first collector connected to the output of the operational amplifier.
A second collector connected to the inverting input for correcting the discharge current;
Current mirror circuit or operational amplifier which is the output of the means
, The input resistance of the operational amplifier, and the base
The emitter is connected to the output of the amplifier and the emitter is the
And the collector is connected to the output of the discharge current correction means.
And a PNP-type transistor,
ing.
【０００９】[0009]
【作用】本発明の電池残量警報装置は、放電電流に比例
した微少電流を電池電圧の分圧回路の分圧点に入力する
ことで放電電流の増加に比例してこの分圧点電圧を上昇
させることができる。従って、この分圧点電圧が所定の
基準電圧と等しくなる時の電池電圧は放電電流の増加に
比例して低下することになり、この低下率を微少電流と
分圧回路の定数により適切に設定することで警報検出時
の残量値は放電電流値によらずほぼ一定となる。According to the battery residual quantity alarm device of the present invention, a minute current proportional to a discharge current is input to a voltage dividing point of a battery voltage dividing circuit, so that the voltage at the dividing point is proportional to an increase in the discharge current. Can be raised. Therefore, when the voltage at the voltage dividing point becomes equal to the predetermined reference voltage, the battery voltage decreases in proportion to the increase in the discharge current, and the rate of decrease is set appropriately by the small current and the constant of the voltage dividing circuit. By doing so, the residual value at the time of alarm detection becomes substantially constant regardless of the discharge current value.
【００１０】[0010]
【実施例】以下本発明の一実施例について図面を参照し
ながら説明する。図１は本発明の一実施例を示す回路図
である。図１において、１は２次電池、２は電流検出抵
抗で２次電池１の負荷に接続されている。３は放電電流
補正手段で電流検出抵抗２の両端に発生する微少電圧を
入力とする演算増幅器３１と、その入力抵抗である抵抗
３２，抵抗３３とその負帰還部で抵抗３４，抵抗３５，
抵抗３６，トランジスタ３７，トランジスタ３８からな
るカレントミラー回路とで構成されている。４は電池電
圧検出手段で、比較器４１とその入力で所定の基準電圧
を発生させる抵抗４２，抵抗４３からなる第１の分圧回
路と、比較器４１のもう一方の入力で電池電圧を分圧
し、その分圧点に放電電流補正手段３の出力が接続され
た抵抗４４，抵抗４５からなる第２の分圧回路とで構成
されている。５は表示手段で、比較器４１の出力を受け
警報表示を行う。６は負荷で携帯機器に相当する。An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing one embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a secondary battery, and 2 denotes a current detection resistor, which is connected to a load of the secondary battery 1. Numeral 3 denotes a discharge current correction means for inputting an operational amplifier 31 to which a very small voltage generated at both ends of the current detecting resistor 2 is inputted, and resistors 32 and 33 as input resistors thereof and resistors 34, 35 and
The current mirror circuit includes a resistor 36, a transistor 37, and a transistor 38. Reference numeral 4 denotes a battery voltage detecting means, a first voltage dividing circuit including a comparator 41 and a resistor 42 and a resistor 43 for generating a predetermined reference voltage at the input thereof, and a battery voltage dividing circuit at the other input of the comparator 41. And a second voltage dividing circuit composed of a resistor 44 and a resistor 45, to which the output of the discharge current correcting means 3 is connected at the voltage dividing point. Reference numeral 5 denotes a display unit which receives an output of the comparator 41 and performs an alarm display. Reference numeral 6 denotes a load corresponding to a portable device.
【００１１】以上のように構成された電池残量警報装置
について、以下その動作を説明する。The operation of the battery level warning device configured as described above will be described below.
【００１２】まず、負荷６が動作することにより２次電
池１は放電状態となる。放電電流は電流検出抵抗２にて
微少電圧に変換され、これを入力とする演算増幅器３１
の負帰還動作により電流検出抵抗２と入力抵抗３３の比
および抵抗３４と抵抗３５の比で決まる放電電流に比例
した微少電流がトランジスタ３８のコレクタより出力さ
れる。この微少電流は電池電圧を分圧する第２の分圧回
路の分圧点に入力され、放電電流の増加に比例してこの
分圧点電圧を上昇させる。従って、放電により電池電圧
が徐々に低下し、この分圧点電圧が第１の分圧回路の分
圧点電圧である所定の基準電圧より低くなる時の電池電
圧は放電電流の増加に比例し、低下することになる。次
に比較器４１は第２の分圧回路の分圧点電圧が第１の分
圧回路の分圧点電圧より低くなったことを検出し、信号
を送出する。表示手段５は比較器４１の信号により電池
残量が残り少ない旨の警報表示を行う。First, the operation of the load 6 causes the secondary battery 1 to be discharged. The discharge current is converted to a minute voltage by the current detection resistor 2 and the operational amplifier 31 which receives the converted voltage as an input.
A small current proportional to the discharge current determined by the ratio of the current detection resistor 2 to the input resistor 33 and the ratio of the resistor 34 to the resistor 35 is output from the collector of the transistor 38. This minute current is input to the voltage dividing point of the second voltage dividing circuit that divides the battery voltage, and increases this voltage at the voltage dividing point in proportion to the increase of the discharge current. Therefore, the battery voltage gradually decreases due to the discharge, and the battery voltage when the voltage dividing point voltage becomes lower than a predetermined reference voltage which is the voltage dividing point voltage of the first voltage dividing circuit is proportional to the increase of the discharging current. , Will fall. Next, the comparator 41 detects that the voltage dividing point voltage of the second voltage dividing circuit has become lower than the voltage dividing point voltage of the first voltage dividing circuit, and sends out a signal. The display means 5 performs an alarm display indicating that the remaining battery level is low based on a signal from the comparator 41.
【００１３】以上のように本実施例によれば、放電電流
を微少電圧に変換する電流検出抵抗２と、この微少電圧
に比例した微少電流を出力する放電電流補正手段３と、
この微少電流を第２の分圧回路の分圧点に入力し、この
分圧点電圧と第１の分圧回路の分圧点電圧である所定の
基準電圧とを比較することで電池電圧の低下を検出し、
信号を送出する電池電圧検出手段４と、この信号を受け
警報表示を行う表示手段５を設けることにより放電電流
の増加に応じて警報検出電圧を低下させることが可能と
なり、この低下率を適切に設定することで警報検出時の
電池残量値を放電電流値によらずほぼ一定とすることが
できる。図３は放電電流の増加に応じて警報検出電圧を
低下させる場合は、充電電流値によらず残量値が一定で
あることを示している。According to this embodiment, as described above, a current detecting resistor 2 for converting the discharge current small voltage, the discharge current correcting means 3 for outputting a fine small current proportional to this small voltage,
This minute current is input to the voltage dividing point of the second voltage dividing circuit, and the voltage dividing point voltage is compared with a predetermined reference voltage which is the voltage dividing point voltage of the first voltage dividing circuit, thereby obtaining the battery voltage. Detects decline,
The provision of the battery voltage detecting means 4 for transmitting a signal and the display means 5 for receiving the signal and performing an alarm display makes it possible to lower the alarm detection voltage in accordance with the increase in the discharge current. By setting, the remaining battery value at the time of alarm detection can be made substantially constant regardless of the discharge current value. FIG. 3 shows that when the alarm detection voltage is reduced according to the increase in the discharge current, the remaining amount is constant regardless of the charge current value.
【００１４】以下本発明の第２の実施例について図面を
参照しながら説明する。図２は本発明の第２の実施例を
示す回路図である。図２において、１は２次電池、２は
電流検出抵抗で２次電池１の正極に接続されている。３
は放電電流補正手段で、電流検出抵抗両端に発生する微
少電圧を入力とする演算増幅器３１と、その入力抵抗３
２および抵抗３３とベースが演算増幅器の出力に、エミ
ッタが演算増幅器３１の反転入力にそれぞれ接続され、
コレクタが出力であるＰＮＰ型トランジスタ３９から構
成されている。その他の構成は基本的に図１と同じであ
るので同一構成部には同一番号を付し、その詳細な説明
を省略する。Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a circuit diagram showing a second embodiment of the present invention. In FIG. 2, 1 is a secondary battery, and 2 is a current detection resistor, which is connected to the positive electrode of the secondary battery 1. 3
Is a discharge current correction means, which comprises an operational amplifier 31 to which a minute voltage generated across the current detection resistor is input, and an input resistance 3
2, the resistor 33 and the base are connected to the output of the operational amplifier, and the emitter is connected to the inverting input of the operational amplifier 31, respectively.
The collector is composed of a PNP transistor 39 which is an output. Other configurations are basically the same as those in FIG. 1, and the same components will be denoted by the same reference numerals and detailed description thereof will be omitted.
【００１５】このように構成された第２の実施例の動作
は、基本的には第１の実施例と同様であって、電流検出
抵抗２の両端に発生する放電電流に比例した微少電圧を
入力とする演算増幅器３１の負帰還動作により電流検出
抵抗２と反転入力抵抗３２の比で決まる放電電流に比例
した微少電流がトランジスタ３９のコレクタより出力さ
れる。その他の動作については第１の実施例と同じであ
るので詳細な説明は省略する。[0015] Operation of the second embodiment thus configured is basically be the same as the first embodiment, fine small in proportion to the discharge current generated across the current detecting resistor 2 Due to the negative feedback operation of the operational amplifier 31 receiving the voltage, a minute current proportional to the discharge current determined by the ratio between the current detection resistor 2 and the inverting input resistor 32 is output from the collector of the transistor 39. Other operations are the same as those in the first embodiment, and thus detailed description is omitted.
【００１６】以上のように電流検出抵抗２を２次電池１
の正極側に設け、放電電流補正手段３を演算増幅器３１
と抵抗３２および３３とトランジスタ３９とで構成する
ことにより、第１の実施例より部品点数の少ない電池残
量警報装置を実現できる。As described above, the current detecting resistor 2 is connected to the secondary battery 1
The discharge current correction means 3 is provided on the positive electrode side of the
With the configuration including the resistors 32 and 33 and the transistor 39, a battery level warning device with a smaller number of components than in the first embodiment can be realized.
【００１７】なお、第１の実施例において電流検出抵抗
２の接続位置を２次電池１の負極側としたが２次電池１
を構成する素電池の間としてもよい。In the first embodiment, the connection position of the current detecting resistor 2 is set to the negative side of the secondary battery 1.
May be between the unit cells constituting the above.
【００１８】また第２の実施例においても同様で、電流
検出抵抗２の接続位置を２次電池１の正極側としたが、
２次電池１を構成する素電池の間としてもよい。Also in the second embodiment, the connection position of the current detecting resistor 2 is set to the positive electrode side of the secondary battery 1,
It may be between the unit cells constituting the secondary battery 1.
【００１９】[0019]
【発明の効果】以上のように本発明は放電電流を微少電
流に変換する電流検出抵抗と、この微少電圧を入力とし
て放電電流に比例した微少電流を出力する放電電流補正
手段と、この微少電流と電池電圧を入力とし所定の基準
電圧と比較することで電池電圧の低下を検出して信号を
出力する電池電圧検出手段と、この信号により電池残量
が残り少ないことを旨とする警報表示を行う表示手段と
を設けることにより、警報検出時の電池残量値が放電電
流値によらずほぼ一定である優れた電池残量警報装置を
実現できるものである。As described above, the present invention provides a current detecting resistor for converting a discharge current into a minute current, a discharge current correcting means for outputting a minute current proportional to the discharge current by inputting the minute voltage, and And a battery voltage detecting means for detecting a drop in the battery voltage and outputting a signal by comparing the battery voltage with a predetermined reference voltage, and performing an alarm display indicating that the remaining battery level is low based on the signal. By providing the display means, it is possible to realize an excellent battery level alarm device in which the battery level at the time of alarm detection is substantially constant regardless of the discharge current value.
【図１】本発明の第１の実施例を示す回路図FIG. 1 is a circuit diagram showing a first embodiment of the present invention.
【図２】本発明の第２の実施例を示す回路図FIG. 2 is a circuit diagram showing a second embodiment of the present invention.
【図３】放電電流の大小による電池電圧と警報検出電圧
の関係を示す特性図FIG. 3 is a characteristic diagram showing a relationship between a battery voltage and an alarm detection voltage according to a magnitude of a discharge current.
【図４】従来例を示す回路図FIG. 4 is a circuit diagram showing a conventional example.
１ ２次電池 ２ 電流検出抵抗 ３ 放電電流補正手段 ４ 電池電圧検出手段 ５ 表示手段 ６ 負荷 DESCRIPTION OF SYMBOLS 1 Secondary battery 2 Current detection resistor 3 Discharge current correction means 4 Battery voltage detection means 5 Display means 6 Load
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｇ０１Ｒ 31/36 Ｇ０１Ｒ 31/36 Ｚ (72)発明者 紺野 哲秀 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 (72)発明者 木下 恵 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 (72)発明者 渡辺 勇一 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 (56)参考文献 特開 平１−100479（ＪＰ，Ａ) 特開 昭63−298168（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) G08B 21/00 G01R 19/165 G01R 31/36 ──────────────────────────────────────────────────の Continuing on the front page (51) Int.Cl. 6 Identification code FI G01R 31/36 G01R 31/36 Z (72) Inventor Tetsuhide Konno 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 72) Inventor Megumi Kinoshita 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture (72) Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Yuichi Watanabe 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP Hei 1-100479 (JP, A) JP-A-63-298168 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) G08B 21/00 G01R 19/165 G01R 31/36
Claims (3)
抗と、前記電流検出抵抗の両端に発生する微少電圧を入
力として放電電流に比例した微少電流を出力する放電電
流補正手段と、前記微少電流を電池電圧の分圧回路の分
圧点に入力して前記分圧点電圧と所定の基準電圧とを比
較し、電池電圧の低下を検出する電池電圧検出手段と、
前記電池電圧検出手段の出力信号により警報表示を行う
表示手段とを備え、警告検出時の電池残量値が放電電流値によらず略一定で
あることを特徴とする 電池残量警報装置。A current detecting resistor for converting a discharge current into a minute voltage; a discharge current correcting means for outputting a minute current proportional to the discharge current by inputting a minute voltage generated at both ends of the current detecting resistor; Battery voltage detecting means for inputting current to a voltage dividing point of a battery voltage dividing circuit, comparing the voltage dividing point voltage with a predetermined reference voltage, and detecting a decrease in battery voltage;
Display means for performing an alarm display based on the output signal of the battery voltage detection means, and the remaining battery value at the time of the warning detection is substantially constant regardless of the discharge current value.
A battery level warning device, comprising:
前記演算増幅器の入力抵抗と、ベースが前記演算増幅器
の出力に接続され第１のコレクタが前記演算増幅器の非
反転入力に接続され第２のコレクタが前記放電電流補正
手段の出力であるカレントミラー回路とを備えた請求項
１記載の電池残量警報装置。As wherein the discharge current compensation means, and an operational amplifier,
An input resistor of said operational amplifier, a base current noninverting connected second collector to the input of the connected first collector the operational amplifier to the output of the operational amplifier is an output of the discharge current correcting means The battery level alarm device according to claim 1, further comprising a mirror circuit.
前記演算増幅器の入力抵抗と、ベースが前記演算増幅器
の出力に接続されエミッタが前記演算増幅器の反転入力
に接続されコレクタが前記放電電流補正手段の出力であ
るＰＮＰ型のトランジスタとを備えた請求項１記載の電
池残量警報装置。As wherein the discharge current compensation means, and an operational amplifier,
An input resistor of said operational amplifier, and a PNP-type transistor is a base output is connected collector is the discharge current correcting means to the inverting input of the connected emitter to the output of the operational amplifier is the operational amplifier The battery level warning device according to claim 1, further comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3227771A JP2894031B2 (en) | 1991-09-09 | 1991-09-09 | Battery level warning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3227771A JP2894031B2 (en) | 1991-09-09 | 1991-09-09 | Battery level warning device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0567282A JPH0567282A (en) | 1993-03-19 |
| JP2894031B2 true JP2894031B2 (en) | 1999-05-24 |
Family
ID=16866126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3227771A Expired - Fee Related JP2894031B2 (en) | 1991-09-09 | 1991-09-09 | Battery level warning device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2894031B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103064025A (en) * | 2011-10-19 | 2013-04-24 | 北京谊安医疗系统股份有限公司 | Battery electric quantity detection method and device using the same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112313851B (en) * | 2019-03-20 | 2024-04-09 | 苏州宝时得电动工具有限公司 | Power supply equipment |
-
1991
- 1991-09-09 JP JP3227771A patent/JP2894031B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103064025A (en) * | 2011-10-19 | 2013-04-24 | 北京谊安医疗系统股份有限公司 | Battery electric quantity detection method and device using the same |
| CN103064025B (en) * | 2011-10-19 | 2017-03-22 | 北京谊安医疗系统股份有限公司 | Battery electric quantity detection method and device using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0567282A (en) | 1993-03-19 |
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