JPH0651876A - Battery remaining capacity detection circuit - Google Patents
Battery remaining capacity detection circuitInfo
- Publication number
- JPH0651876A JPH0651876A JP4202797A JP20279792A JPH0651876A JP H0651876 A JPH0651876 A JP H0651876A JP 4202797 A JP4202797 A JP 4202797A JP 20279792 A JP20279792 A JP 20279792A JP H0651876 A JPH0651876 A JP H0651876A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- voltage
- value
- output
- resistor
- 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.)
- Granted
Links
Landscapes
- Power Sources (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は電池残量検出回路に関
し、特に電池を電源として動作する装置の電池の残量を
検出する電池残量検出回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery remaining amount detecting circuit, and more particularly to a battery remaining amount detecting circuit for detecting the remaining amount of the battery of a device which operates by using the battery as a power source.
【０００２】[0002]
【従来の技術】従来の電源回路の電池残量検出回路に
は、電池の電圧値で電池の残量を検出する方法がある。
また、電池の充放電の状態を専用のマイコンで監視し、
電池の残量を使用者に知らせるものもある。2. Description of the Related Art In a conventional battery remaining amount detecting circuit of a power supply circuit, there is a method of detecting the remaining amount of the battery by the voltage value of the battery.
In addition, the state of charge and discharge of the battery is monitored by a dedicated microcomputer,
Some also inform the user of the battery level.
【０００３】[0003]
【発明が解決しようとする課題】上述した従来の電池残
量検出回路は、装置の負荷変動があると電池の内部イン
ピーダンスによって電池電圧が変動するため、電池の電
圧値だけで電池の残量を検出する方法では電池の残量を
正確に判断できないという欠点がある。特に、ある電圧
値で電池の残量の警報を出す装置では、負荷が軽いとき
と思いときとで警報時の装置の残量が同じにならないと
いう欠点がある。In the conventional battery level detection circuit described above, the battery voltage fluctuates due to the internal impedance of the battery when the load of the device fluctuates. Therefore, the battery level can be used to determine the battery level. The detection method has a drawback that the remaining battery level cannot be accurately determined. In particular, a device that issues a warning of the remaining battery level at a certain voltage value has a drawback that the remaining amount of the device at the time of warning does not become the same when the load is light.
【０００４】また、専用マイコンでの監視については、
電池残量等を計算して使用者に知らせることは化膿であ
るが、専用マイコンを常にバックアップしておく必要が
あった。また、交換可能な電池パックの場合は一度電池
パックを交換されるとそれまでバックアップしていた内
容が無効になるといった欠点があった。Regarding monitoring with a dedicated microcomputer,
Although it is suppurative to inform the user by calculating the remaining battery level, it was necessary to always back up the dedicated microcomputer. Further, in the case of a replaceable battery pack, once the battery pack is replaced, the contents backed up until then become invalid.
【０００５】[0005]
【課題を解決するための手段】本発明の電池残量検出回
路は、電池を電源として動作する装置の電源回路におい
て、前記電池の電圧値に比例した電圧を検出する手段
と、前記電池からの放電経路に挿入された抵抗と、この
抵抗の両端間の電圧によって前記電池から流れる電流を
電圧値に換算する手段と、前記電圧値を前記電池の電圧
値に比例した電圧値に加算して出力する手段と、電流値
の電圧換算値と電池電圧のドロップ分が等しくなるよう
に調整する手段とを有する。SUMMARY OF THE INVENTION A battery remaining amount detection circuit of the present invention is a power supply circuit of an apparatus that operates using a battery as a power source, and a means for detecting a voltage proportional to the voltage value of the battery, A resistor inserted in the discharge path, means for converting the current flowing from the battery into a voltage value by the voltage across the resistor, and adding the voltage value to a voltage value proportional to the voltage value of the battery and outputting it. And a means for adjusting the voltage conversion value of the current value and the drop of the battery voltage to be equal.
【０００６】[0006]
【実施例】次に本発明について図面を参照して説明す
る。図１は本発明の一実施例のブロック図、図２は本発
明の一実施例の回路図である。The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a circuit diagram of an embodiment of the present invention.
【０００７】本実施例は、電池１の電圧値に比例した電
圧を検出する電池電圧分圧部３と、電池１からの放電経
路に直列（シリアル）に挿入された抵抗の両端間の電圧
値により電池１から流れる電流を電圧値に換算する差動
増幅部４と、その電圧値を電池１の電圧値に比例した電
圧値に加算した電圧値を出力する加算回路５と、電流値
の電圧換算値および電池電圧のドロップ分が等しくなる
ように調整して、負荷変動に関わらず電池の残量によっ
て電圧が変化するように構成する。In this embodiment, the battery voltage dividing unit 3 for detecting a voltage proportional to the voltage value of the battery 1 and the voltage value across the resistor inserted in series in the discharge path from the battery 1 are connected. The differential amplifier 4 for converting the current flowing from the battery 1 into a voltage value by the above, the addition circuit 5 for outputting the voltage value obtained by adding the voltage value to the voltage value proportional to the voltage value of the battery 1, and the voltage of the current value The conversion value and the drop of the battery voltage are adjusted to be equal so that the voltage changes depending on the remaining amount of the battery regardless of load fluctuation.
【０００８】次に本実施例の動作について説明する。電
池１は、装置負荷６に接続され、装置負荷６に流れる電
流はシリアル抵抗２を通る。シリアル抵抗２の両端間の
電圧は差動増幅部４で増幅され、その出力と電池電圧分
圧部３の出力とを加算回路５が加算し出力する。差動増
幅部４は入力段の両端の電圧を増幅する部分でその回路
の詳細を図２に示す。電圧分圧部３の詳細は図２に示す
ように電池１の端子電圧を抵抗によって分圧しその分圧
値をオペアンプ３１によってボルテージフォロワで入力
インピーダンスをあげて出力インピーダンスを下げてい
る。加算回路５は電池電圧分圧部３と差動増幅部４との
出力を加算する回路で詳細を図２に示す。Next, the operation of this embodiment will be described. The battery 1 is connected to the device load 6, and the current flowing through the device load 6 passes through the serial resistor 2. The voltage across the serial resistor 2 is amplified by the differential amplifier 4, and the output thereof and the output of the battery voltage divider 3 are added by the adder circuit 5 and output. The differential amplifier 4 is a part that amplifies the voltage across the input stage, and the details of the circuit are shown in FIG. As shown in FIG. 2, the details of the voltage dividing unit 3 are obtained by dividing the terminal voltage of the battery 1 by a resistor and reducing the output impedance by increasing the input impedance by a voltage follower by the operational amplifier 31 by the voltage divided value. The adder circuit 5 is a circuit for adding the outputs of the battery voltage dividing unit 3 and the differential amplifying unit 4, the details of which are shown in FIG.
【０００９】仮に装置負荷６が変化し、電池からの出力
電流が増加した場合には電池１の内部インピーダンスに
よって電池１の端子電圧は低下する。したがって、電池
電圧分圧部３の出力電圧も電池１の出力電圧に比例して
低下する。しかし、電流の増加分だけシリアル抵抗２の
両端間の電圧が増加し、これに比例して差動増幅部４の
出力も増加する。If the device load 6 changes and the output current from the battery increases, the internal impedance of the battery 1 causes the terminal voltage of the battery 1 to decrease. Therefore, the output voltage of the battery voltage dividing unit 3 also decreases in proportion to the output voltage of the battery 1. However, the voltage across the serial resistor 2 increases by the amount of increase in the current, and the output of the differential amplifier 4 increases in proportion to this.
【００１０】このようにすると、電池残量を電池の電圧
値だけでなく電池から流れる電流値の電圧換算値も検出
し、それらの二つを加算することで、電池の残量を負荷
の大きさに関係なく検出できる。よって、ある電圧値で
電池の残量の警報を出す装置においても、負荷が軽いと
きと重いときとでも警報後の装置の動作時間が同じにな
る。In this way, not only the voltage value of the battery but also the voltage conversion value of the current value flowing from the battery is detected as the battery remaining amount, and the two are added to determine the battery remaining amount as the load. It can be detected regardless of the size. Therefore, also in the device that issues a warning of the remaining battery level at a certain voltage value, the operating time of the device after the alarm becomes the same when the load is light and when the load is heavy.
【００１１】また、電力消費量を積算してその値を保持
する必要がないため、交換可能な電池パックの場合でも
正確に電池の残量検出が可能である。またマイコン使用
時のようにデータをバックアップする必要がない。Further, since it is not necessary to accumulate the power consumption and hold the value, it is possible to accurately detect the remaining battery level even in the case of a replaceable battery pack. In addition, there is no need to back up data as when using a microcomputer.
【００１２】[0012]
【発明の効果】以上説明したように、本発明による電池
残量検出回路は、電池の放電経路に挿入された抵抗によ
り電池からの放電電流を電圧に変換し、電池の電圧値の
分圧値と放電電流の電圧変換値との加算回路を有し、放
電電流によらず電池の残量を電圧値に換算可能な手段を
備えることにより、電池の残量を負荷の大きさに関係な
く検出できる。また、負荷が軽いときと重いときとでも
警報後の装置の動作時間が同じになる。また、電力消費
量を積算してその値を保持する必要がないため、交換可
能な電池パックの場合でも正確に電池の残量検出が可能
である。またマイコン使用時のようにデータをバックア
ップする必要がない。As described above, the battery remaining amount detection circuit according to the present invention converts the discharge current from the battery into a voltage by the resistance inserted in the discharge path of the battery, and divides the voltage value of the battery into a divided value. And a discharge current voltage conversion value addition circuit, and a means that can convert the remaining battery level into a voltage value regardless of the discharge current so that the remaining battery level can be detected regardless of the size of the load. it can. Further, the operation time of the device after the alarm becomes the same when the load is light and when the load is heavy. Further, since it is not necessary to integrate the power consumption and hold the value, it is possible to accurately detect the remaining battery level even in the case of a replaceable battery pack. In addition, there is no need to back up data as when using a microcomputer.
【図１】本発明の一実施例のブロック図である。FIG. 1 is a block diagram of an embodiment of the present invention.
【図２】本発明の一実施例の回路図である。FIG. 2 is a circuit diagram of an embodiment of the present invention.
１ 電池 ２ シリアル抵抗 ３ 電池電圧分圧部 ４ 差動増幅部 ５ 加算増幅部 ６ 装置負荷 1 battery 2 serial resistance 3 battery voltage divider 4 differential amplifier 5 summing amplifier 6 device load
Claims (1)
路において、前記電池の電圧値に比例した電圧を検出す
る手段と、前記電池からの放電経路に挿入された抵抗
と、この抵抗の両端間の電圧によって前記電池から流れ
る電流を電圧値に換算する手段と、前記電圧値を前記電
池の電圧値に比例した電圧値に加算して出力する手段
と、電流値の電圧換算値と電池電圧のドロップ分が等し
くなるように調整する手段とを有することを特徴とする
電池残量検出回路。1. In a power supply circuit of a device that operates using a battery as a power supply, means for detecting a voltage proportional to the voltage value of the battery, a resistor inserted in a discharge path from the battery, and a resistor between both ends of the resistor. Means for converting the current flowing from the battery into a voltage value by the voltage of, a means for adding the voltage value to a voltage value proportional to the voltage value of the battery and outputting the voltage value, a voltage conversion value of the current value and the battery voltage And a means for adjusting the drop amounts to be equal to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4202797A JP2833361B2 (en) | 1992-07-30 | 1992-07-30 | Battery level detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4202797A JP2833361B2 (en) | 1992-07-30 | 1992-07-30 | Battery level detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0651876A true JPH0651876A (en) | 1994-02-25 |
| JP2833361B2 JP2833361B2 (en) | 1998-12-09 |
Family
ID=16463354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4202797A Expired - Fee Related JP2833361B2 (en) | 1992-07-30 | 1992-07-30 | Battery level detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2833361B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7348761B2 (en) | 2004-03-30 | 2008-03-25 | Seiko Epson Corporation | Information terminal and battery remaining capacity calculating method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55164556U (en) * | 1979-04-05 | 1980-11-26 | ||
| JPH04123118A (en) * | 1990-09-13 | 1992-04-23 | Toshiba Corp | Power source controller |
-
1992
- 1992-07-30 JP JP4202797A patent/JP2833361B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55164556U (en) * | 1979-04-05 | 1980-11-26 | ||
| JPH04123118A (en) * | 1990-09-13 | 1992-04-23 | Toshiba Corp | Power source controller |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7348761B2 (en) | 2004-03-30 | 2008-03-25 | Seiko Epson Corporation | Information terminal and battery remaining capacity calculating method |
| US7498773B2 (en) | 2004-03-30 | 2009-03-03 | Seiko Epson Corporation | Information terminal and battery remaining capacity calculating method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2833361B2 (en) | 1998-12-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19980901 |
|
| LAPS | Cancellation because of no payment of annual fees |