JPH04136774A - Apparatus for detecting capacity of battery - Google Patents
Apparatus for detecting capacity of batteryInfo
- Publication number
- JPH04136774A JPH04136774A JP2257284A JP25728490A JPH04136774A JP H04136774 A JPH04136774 A JP H04136774A JP 2257284 A JP2257284 A JP 2257284A JP 25728490 A JP25728490 A JP 25728490A JP H04136774 A JPH04136774 A JP H04136774A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- circuit
- voltage
- large current
- voltage drop
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 9
- 238000005070 sampling Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 3
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Tests Of Electric Status Of Batteries (AREA)
- Secondary Cells (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は電池を主電源とする装置における電池の残容量
を検出する方式に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for detecting the remaining capacity of a battery in a device whose main power source is a battery.
（従来の技術）
ポータプル端末装置等の小型電子機器においては電池、
例えば、ニッケル・カドミウム（ＮｉＣｄ）電池を内蔵
して、動力系やロジック系の主電源としている。(Prior art) In small electronic devices such as portable terminal devices, batteries,
For example, a nickel cadmium (NiCd) battery is built-in and serves as the main power source for the power system and logic system.
（発明が解決しようとする課題）
一般に上記小型電子機器で電池を使用する時、その電池
容量の状態が不明であり、使用時間が長くなることが予
想される場合、使用途中で電池容量が不足し、機器の機
能が中断される恐れがあった。(Problem to be solved by the invention) Generally, when using a battery in the above-mentioned small electronic device, the state of the battery capacity is unknown and if the usage time is expected to be long, the battery capacity will run out during use. However, there was a risk that the functionality of the equipment would be interrupted.
このため、電池容量を表示するようにしているが、これ
は、使用される装置の「消費電流×使用時間」等々の演
算手段を必要とし高度の技術並びにコスト高となるとい
う問題があった。For this reason, the battery capacity is displayed, but this requires calculation means such as "consumption current x usage time" of the device used, resulting in a problem of high technology and high cost.
本発明はこのような問題点を解決し、簡単な手段で電池
の残容量を検出しうることを目的とする。It is an object of the present invention to solve these problems and to be able to detect the remaining capacity of a battery with a simple means.
（課題を解決するための手段）
本発明は上記課題を解決し目的を達成するため、電池を
主電源とする装置において、前記電池の残容量が充分あ
るかどうか電源オン時、一時的に大電流を放電する手段
と、その放電時の電圧降下を検出する手段と、その降下
電圧が予め設定された電池電圧値と比較し、降下電圧が
大きい時残容量が不足していることを判断する制御手段
とを具備することを特徴とする。(Means for Solving the Problems) In order to solve the above-mentioned problems and achieve the objects, the present invention provides a device that uses a battery as its main power source, and when the power is turned on, there is a temporary A means for discharging current, a means for detecting a voltage drop during the discharge, and comparing the voltage drop with a preset battery voltage value, and determining that the remaining capacity is insufficient when the voltage drop is large. It is characterized by comprising a control means.
（作 用）
本発明は装置の電源オン時に一時的に大電流を負荷へ供
給し、その時の電圧降下分とその時の電池電圧値を読取
り、使用電池の放電特性を予め記憶させた電池電圧値と
比較し、電池が使用できるか否か判断するようにした簡
単な方式である。(Function) The present invention temporarily supplies a large current to the load when the power of the device is turned on, reads the voltage drop at that time and the battery voltage value at that time, and stores the discharge characteristics of the used battery in advance. This is a simple method that determines whether the battery can be used or not.
（実施例）
第１図は本発明方式の一実施例のブロック図を示し、図
中、１は装置に内蔵される電池（区側では、ＮｉＣｄ電
池）、２はパワーオン／オフ回路、３は装置の負荷（区
側では、ロジック負荷）、４は大電流放電回路、５は該
大電流放電回路４の動作時に電池１の電圧降下を検出す
る電圧検出回路、６は大電流放電時の電圧降下から電池
１の使用可否状態を判断し、かつ前記パワーオン／オフ
回路２を駆動制御する制御回路である。(Embodiment) FIG. 1 shows a block diagram of an embodiment of the method of the present invention, in which 1 is a battery built into the device (NiCd battery on the side), 2 is a power on/off circuit, and 3 is a power on/off circuit. 4 is a large current discharge circuit; 5 is a voltage detection circuit that detects the voltage drop of battery 1 when the large current discharge circuit 4 is in operation; 6 is a voltage detection circuit during large current discharge. This is a control circuit that determines whether the battery 1 can be used based on the voltage drop and controls the drive of the power on/off circuit 2.
これを動作させるには、制御回路６でパワーオン／オフ
回路２を一時的にオンして電池１から大電流放電回路４
に大電流を流す。この時の電流値及び電圧降下分が大電
流放電回路４及び電圧検出回路５から制御回路６へ夫々
入力され、これにより残容量が判断される。To operate this, the control circuit 6 temporarily turns on the power on/off circuit 2 to discharge the large current from the battery 1 to the large current discharge circuit 4.
A large current is passed through. The current value and voltage drop at this time are input from the large current discharge circuit 4 and the voltage detection circuit 5 to the control circuit 6, respectively, and the remaining capacity is determined based on these.
第２図は第１図の制御回路の機能を説明するための回路
構成図、第３図は電池電圧Ｖの特性例図、第４図は電池
放電特性例図を示す。FIG. 2 is a circuit configuration diagram for explaining the function of the control circuit shown in FIG. 1, FIG. 3 is a diagram showing an example of battery voltage V characteristics, and FIG. 4 is a diagram showing an example of battery discharge characteristics.
制御回路６はパワーオン／オフ回路２により電池電源１
をオン（負荷回路８はオンせず）し、電池電圧Ｖの１回
目のサンプリング■を行ないＡ／Ｄコンバータ７にてデ
ジタル信号に変換し制御回路５の記憶素子（回路）に記
憶する。この様子を第３図の電池電圧Ｖの特性例図にて
説明すると、負荷回路８をオンせずの時の電池電圧■は
Ａカーブの通りであり、サンプリング■の電池電圧Ｖが
記憶素子に記憶される。The control circuit 6 is connected to the battery power source 1 by the power on/off circuit 2.
is turned on (the load circuit 8 is not turned on), the first sampling (2) of the battery voltage V is performed, and the A/D converter 7 converts it into a digital signal and stores it in the storage element (circuit) of the control circuit 5. To explain this situation using the characteristic example diagram of the battery voltage V shown in Fig. 3, the battery voltage ■ when the load circuit 8 is not turned on follows the A curve, and the battery voltage V of the sampling ■ is applied to the memory element. be remembered.
次に負荷回路８をオンすると電池電圧ＶはＢカーブの通
り降下し、２回目■、３回目■とある周期してサンプリ
ング行なう。この時の負荷回路８の電圧変化はＣカーブ
であり、負荷オン／オフ期間をＴ（Ｒ）で示す。Next, when the load circuit 8 is turned on, the battery voltage V drops according to curve B, and sampling is performed at certain intervals such as the second time (2) and the third time (2). The voltage change of the load circuit 8 at this time is a C curve, and the load on/off period is indicated by T(R).
このようにして期間Ｔ（Ｒ）においてサンプリングをｎ
回行なったとき、１回目の電池電圧Ｖより低い値の電池
電圧をＡ／Ｄコンバータを介して検出するが、この値は
第３図のＡカーブとＢカーブで示すように電池残容量に
依存し、順次に各サンプリング０〜点の電池電圧Ｖを記
憶素子に記憶させ、制御回路６は１回目のサンプリング
■での電池電圧Ｖとの差を順次算出する。In this way, sampling is performed during period T(R).
When the cycle is repeated, a battery voltage lower than the first battery voltage V is detected via the A/D converter, but this value depends on the remaining battery capacity as shown by curves A and B in Figure 3. Then, the battery voltage V at each sampling point 0 to points is sequentially stored in the memory element, and the control circuit 6 sequentially calculates the difference from the battery voltage V at the first sampling (2).
そして、第４図に示すような電池の放電特性は、負荷（
ロジック負荷３と負荷回路８）と、残容量（％）により
異なる。そこで、例えば、「１回目の電池電圧ｖ１−７
回目の電池電圧Ｖ、Ｊの差から、残容量の値を推定する
。これを第４図の区側でのべるとロジック負荷３の放電
特性と負荷回路８の放電特性では残容量７５％以上の時
の電池電圧Ｖにおいて、ロジック負荷３の方が負荷回路
８に比べて可成り高く検出され、残容量が次第に少なく
なるに従いロジック負荷３．負荷回路８の電池電圧差が
少なくなる。このことから、ロジック負荷３を電池電源
１に接続した時のＢカーブによる残容量７５％を電池電
圧Ｖの基準値にして、前記大電流放電時の電池電圧と比
較し、電池使用の可否を判断するように制御回路６で行
ない表示すればよい。The discharge characteristics of the battery as shown in Fig. 4 are determined by the load (
It differs depending on the logic load 3 and load circuit 8) and the remaining capacity (%). Therefore, for example, "1st battery voltage v1-7
The remaining capacity value is estimated from the difference between the battery voltages V and J for the second time. Expressing this on the side of Fig. 4, the discharge characteristics of logic load 3 and the discharge characteristics of load circuit 8 show that logic load 3 is higher than load circuit 8 at battery voltage V when the remaining capacity is 75% or more. The logic load is detected to be quite high, and as the remaining capacity gradually decreases, the logic load 3. The battery voltage difference in the load circuit 8 is reduced. From this, 75% of the remaining capacity according to the B curve when the logic load 3 is connected to the battery power source 1 is set as the reference value for the battery voltage V, and compared with the battery voltage at the time of large current discharge, it is determined whether or not the battery can be used. The control circuit 6 may perform and display the judgment.
（発明の効果）
以上説明したように本発明は、使用電池の放電特性と予
め記憶された電池の残容量を示す可能な電池電圧とを比
較して、電池使用の可否を決定できる簡単な方式であり
、コスト的に有利である。(Effects of the Invention) As explained above, the present invention provides a simple method for determining whether or not the battery can be used by comparing the discharge characteristics of the battery being used with the possible battery voltage that indicates the remaining capacity of the battery stored in advance. Therefore, it is advantageous in terms of cost.
第１図は本発明方式の一実施例のブロック図、第２図は
第１図の制御回路の機能を説明する回路構成図、第３図
は電池電圧■の特性例図、第４図は電池放電特性例図で
ある。
■・・・電池、 ２・・・パワーオン／オフ回路、３
・・・ロジック負荷、 ４・・・大電流放電回路、
５・・・電圧検出回路、 ６・・・制御回路、 ７
・・・Ａ／Ｄコンバータ、 ８・・・負荷回路。
特許出願人 リコー電子工業株式会社
第１図
第２区Fig. 1 is a block diagram of an embodiment of the method of the present invention, Fig. 2 is a circuit configuration diagram explaining the function of the control circuit shown in Fig. 1, Fig. 3 is a characteristic example diagram of battery voltage ■, Fig. 4 is FIG. 3 is an example diagram of battery discharge characteristics. ■...Battery, 2...Power on/off circuit, 3
...Logic load, 4...Large current discharge circuit,
5... Voltage detection circuit, 6... Control circuit, 7
...A/D converter, 8...Load circuit. Patent applicant: Ricoh Electronic Industries Co., Ltd., Figure 1, Section 2
Claims (1)
が充分あるかどうか電源オン時、一時的に大電流を放電
する手段と、その放電時の電圧降下を検出する手段と、
その降下電圧が予め設定された電池電圧値と比較し、降
下電圧が大きい時残容量が不足していることを判断する
制御手段とを具備することを特徴とする電池容量検出方
式。In a device using a battery as a main power source, means for temporarily discharging a large current when the power is turned on to check whether the battery has sufficient remaining capacity, and means for detecting a voltage drop during the discharge;
A battery capacity detection method characterized by comprising a control means for comparing the voltage drop with a preset battery voltage value and determining that the remaining capacity is insufficient when the voltage drop is large.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2257284A JPH04136774A (en) | 1990-09-28 | 1990-09-28 | Apparatus for detecting capacity of battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2257284A JPH04136774A (en) | 1990-09-28 | 1990-09-28 | Apparatus for detecting capacity of battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04136774A true JPH04136774A (en) | 1992-05-11 |
Family
ID=17304241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2257284A Pending JPH04136774A (en) | 1990-09-28 | 1990-09-28 | Apparatus for detecting capacity of battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04136774A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2342178A (en) * | 1998-09-30 | 2000-04-05 | Snap On Equipment Ltd | Battery testing |
| US6563318B2 (en) | 2000-05-23 | 2003-05-13 | Canon Kabushiki Kaisha | Detecting method for detecting internal state of a rechargeable battery, detecting device for practicing said detecting method, and instrument provided with said detecting device |
| US6683440B2 (en) | 2001-05-29 | 2004-01-27 | Canon Kabushiki Kaisha | Detecting method for detecting internal information of a rechargeable battery, detecting apparatus for detecting internal information of a rechargeable battery, apparatus in which said detecting method is applied, apparatus including said detecting apparatus, and storage medium in which a software program of said detecting method is stored |
| TWI505530B (en) * | 2010-11-24 | 2015-10-21 | Fih Hong Kong Ltd | Battery capacitance detecting system |
-
1990
- 1990-09-28 JP JP2257284A patent/JPH04136774A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2342178A (en) * | 1998-09-30 | 2000-04-05 | Snap On Equipment Ltd | Battery testing |
| GB2342178B (en) * | 1998-09-30 | 2003-04-09 | Snap On Equipment Ltd | Method and apparatus for automotive and other battery testing |
| US6563318B2 (en) | 2000-05-23 | 2003-05-13 | Canon Kabushiki Kaisha | Detecting method for detecting internal state of a rechargeable battery, detecting device for practicing said detecting method, and instrument provided with said detecting device |
| US6683440B2 (en) | 2001-05-29 | 2004-01-27 | Canon Kabushiki Kaisha | Detecting method for detecting internal information of a rechargeable battery, detecting apparatus for detecting internal information of a rechargeable battery, apparatus in which said detecting method is applied, apparatus including said detecting apparatus, and storage medium in which a software program of said detecting method is stored |
| TWI505530B (en) * | 2010-11-24 | 2015-10-21 | Fih Hong Kong Ltd | Battery capacitance detecting system |
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