JP3278487B2 - Rechargeable power supply - Google Patents
Rechargeable power supplyInfo
- Publication number
- JP3278487B2 JP3278487B2 JP06575693A JP6575693A JP3278487B2 JP 3278487 B2 JP3278487 B2 JP 3278487B2 JP 06575693 A JP06575693 A JP 06575693A JP 6575693 A JP6575693 A JP 6575693A JP 3278487 B2 JP3278487 B2 JP 3278487B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- secondary battery
- power supply
- switch
- 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 - Lifetime
Links
Description
【０００１】[0001]
【産業上の利用分野】この発明は、二次電池の充放電を
制御することができる充放電制御回路と、その回路を利
用した充電式電源装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charge / discharge control circuit capable of controlling charging / discharging of a secondary battery, and a rechargeable power supply using the circuit.
【０００２】[0002]
【従来の技術】従来の二次電池からなる充電式電源装置
を図２に示す。外部端子−Ｖ0 、又は、＋Ｖ0 はスイッ
チ回路１０３、電流センス用抵抗１０４を介して、二次
電池１０１が接続されている。さらに二次電池１０１に
並列に接続して、充放電制御回路１０２及び過電流検出
回路１０５が設けられている。充放電制御回路１０２
は、二次電池１０１の電圧を検出する機能を備え、二次
電池１０１の電圧が過充電状態、または過放電状態のい
ずれかの場合は、スイッチ回路１０３をＯＦＦするよう
に充放電制御回路１０２から信号が出る。また負荷に異
常が起こり、過電流状態となった時は、電流センス用抵
抗１０４の電圧をコンパレータ１０５がモニタし、基準
電圧回路１０６の電圧と比較する。仮に、基準電圧回路
１０６の電圧値を、ＶREF 〔Ｖ〕電流センス用抵抗１０
４の抵抗値をＲ〔Ω〕（この時、スイッチ回路１０３の
ＯＮ抵抗は、Ｒより充分小さいものとする） そこに流
れる電流をＩ〔Ａ〕とすれば、 Ｉ≧ＶREF ／Ｒ〔Ａ〕 …（１） の時、コンパレータ１０５の出力が“Ｌ”→“Ｈ”とな
り、スイッチ回路１０３をＯＦＦする。2. Description of the Related Art FIG. 2 shows a conventional rechargeable power supply comprising a secondary battery. The external terminal -V 0 or + V 0 is connected to the secondary battery 101 via the switch circuit 103 and the current sensing resistor 104. Further, a charge / discharge control circuit 102 and an overcurrent detection circuit 105 are provided in parallel with the secondary battery 101. Charge / discharge control circuit 102
Has a function of detecting the voltage of the secondary battery 101. If the voltage of the secondary battery 101 is in either the overcharged state or the overdischarged state, the charge / discharge control circuit 102 turns off the switch circuit 103. Will give a signal. When an abnormality occurs in the load and an overcurrent state occurs, the voltage of the current sensing resistor 104 is monitored by the comparator 105 and compared with the voltage of the reference voltage circuit 106. Assuming that the voltage value of the reference voltage circuit 106 is V REF [V]
4 is R [Ω] (at this time, the ON resistance of the switch circuit 103 is sufficiently smaller than R) If the current flowing there is I [A], I ≧ V REF / R [A In the case of (1), the output of the comparator 105 changes from “L” to “H”, and the switch circuit 103 is turned off.
【０００３】この時、外部端子＋Ｖ0 、−Ｖ0 間の電圧
は、二次電池の電圧をＥとすれば、 Ｅ−ＩＸＲ〔Ｖ〕 …（２） となる。At this time, the voltage between the external terminals + V 0 and −V 0 is E-IXR [V] (2) where E is the voltage of the secondary battery.
【０００４】[0004]
【発明が解決しようとする課題】しかし、従来の充放電
制御回路では、電流センス用抵抗による電圧ドロップに
よって、二次電池から取り出せる電圧が下がり、その分
二次電池を有効に使用できないという課題があった。However, the conventional charge / discharge control circuit has a problem that the voltage that can be taken out of the secondary battery is reduced due to the voltage drop by the current sensing resistor, and the secondary battery cannot be used effectively. there were.
【０００５】そこで、本発明の目的は従来のこのような
課題を解決するために、基準電圧の値をトリミングし
て、スイッチとなるトランジスタのドレイン・ソース間
のＯＮ抵抗と過電流値との積に合わせ込むことで、電流
センス用抵抗を除き、二次電池を有効に使用できる充放
電制御回路を得ることを目的としている。Therefore, an object of the present invention is to solve the conventional problem by trimming the value of the reference voltage to obtain the product of the ON resistance between the drain and source of the transistor serving as a switch and the overcurrent value. It is an object of the present invention to obtain a charge / discharge control circuit that can effectively use a secondary battery except for a current sensing resistor.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するため
に、この発明は充放電制御回路において電流センス用の
抵抗を除き、スイッチとなるトランジスタのソース・ド
レイン間のＯＮ抵抗と過電流値との積に等しい基準電圧
回路を設けた。In order to solve the above-mentioned problems, the present invention excludes a current sensing resistor in a charge / discharge control circuit, and determines an ON resistance between a source and a drain of a transistor serving as a switch and an overcurrent value. A reference voltage circuit equal to the product of
【０００７】[0007]
【作用】上記のように構成された充放電制御回路におい
ては、電流センス用抵抗による電圧ドロップがなくな
り、二次電池を有効に使用することができる。In the charge / discharge control circuit configured as described above, the voltage drop due to the current sensing resistor is eliminated, and the secondary battery can be used effectively.
【０００８】[0008]
【実施例】以下に、この発明の実施例を図面に基づいて
説明する。図１は、本発明の充放電制御回路の回路ブロ
ック図である。図１において外部端子−Ｖ0 、＋Ｖ0 、
スイッチ回路１０３、二次電池１０１、コンパレータ１
０５、プルダウン用高抵抗１０７は、図２と同様であ
る。過電流を検出するための電圧検出回路は、基準電圧
発生回路１０６をコンパレータ１０５とにより構成され
ている。さらに、基準電圧回路１０６は出力である基準
電圧は、スイッチ回路１０３のソース・ドレイン間のＯ
Ｎ抵抗と過電流値との積にトリミングされている。例え
ば、一つのトランジスタのソース・ドレイン間のＯＮ抵
抗を０．１Ω、過電流値を２Ａとすれば、基準電圧回路
の電圧は（０．１×２）×２＝０．４Ｖにトリミングさ
れている。即ち、この場合、二次電池１０１の放電電流
が２Ａになると、スイッチ回路１０３のトランジスタの
ＯＮ抵抗によるドロップで、コンパレータ１０５が過電
流を検出してスイッチ回路１０３をＯＦＦする。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit block diagram of a charge / discharge control circuit of the present invention. In FIG. 1, the external terminals −V 0 , + V 0 ,
Switch circuit 103, secondary battery 101, comparator 1
05, the pull-down high resistance 107 is the same as in FIG. A voltage detection circuit for detecting an overcurrent includes a reference voltage generation circuit 106 and a comparator 105. Further, the reference voltage, which is an output of the reference voltage circuit 106,
Trimmed to the product of the N resistance and the overcurrent value. For example, if the ON resistance between the source and the drain of one transistor is 0.1Ω and the overcurrent value is 2A, the voltage of the reference voltage circuit is trimmed to (0.1 × 2) × 2 = 0.4V. I have. That is, in this case, when the discharge current of the secondary battery 101 becomes 2 A, the comparator 105 detects an overcurrent due to the drop due to the ON resistance of the transistor of the switch circuit 103 and turns off the switch circuit 103.
【０００９】この場合、電流センス用抵抗によるドロッ
プが存在しないため、外部端子＋Ｖ 0 、−Ｖ0 間の電圧
は、二次電池の電圧に対し、スイッチ回路１０３のトラ
ンジスタのＯＮ抵抗による電圧ドロップのみなので、二
次電池を有効に利用することが可能である。In this case, the drop by the current sensing resistor is performed.
External terminal + V 0, -V0Voltage between
Is the voltage of the secondary battery,
Since only the voltage drop due to the ON resistance of the transistor
The secondary battery can be used effectively.
【００１０】上記説明においては、充放電制御回路１０
２に過電流検出機能が含まれないとして説明した。しか
し、本発明は充放電制御回路の中に過電流検出機能が含
んでいると考えることができることは言うまでもない。In the above description, the charge / discharge control circuit 10
2 has been described as not including the overcurrent detection function. However, it goes without saying that the present invention can be considered to include an overcurrent detection function in the charge / discharge control circuit.
【００１１】[0011]
【発明の効果】本発明の充放電制御回路は、スイッチ回
路のトランジスタのＯＮ抵抗と、過電流値との積と等し
い基準電圧回路を用いて過電流検出を行うことで、二次
電池を有効に使用できるという効果がある。According to the charge / discharge control circuit of the present invention, the overcurrent detection is performed using a reference voltage circuit equal to the product of the ON resistance of the transistor of the switch circuit and the overcurrent value, so that the secondary battery can be effectively used. There is an effect that can be used.
【図１】本発明の充放電制御回路図である。FIG. 1 is a charge / discharge control circuit diagram of the present invention.
【図２】従来の充放電制御回路図である。FIG. 2 is a conventional charge / discharge control circuit diagram.
１０１ 二次電池 １０２ 充放電制御回路 １０３ スイッチ回路 １０４ 電流センス用抵抗 １０５ コンパレータ １０６ 基準電圧回路 DESCRIPTION OF SYMBOLS 101 Secondary battery 102 Charge / discharge control circuit 103 Switching circuit 104 Current sensing resistor 105 Comparator 106 Reference voltage circuit
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−250636（ＪＰ，Ａ) 特開 平３−112319（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H02J 7/00 - 7/12 H02J 7/34 - 7/36 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-250636 (JP, A) JP-A-3-112319 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) H02J 7/00-7/12 H02J 7/34-7/36
Claims (1)
回路及び二次電池と、前記スイッチ回路を制御するため
に前記二次電池に並列接続した充放電制御回路とからな
る充電式電源装置において、前記スイッチ回路が直列接続された二つのトランジスタ
からなり、 前記充放電制御回路は、前記二つのトランジスタの各ソ
ース・ドレイン間のオン抵抗の和と過電流値との積にト
リミングされている基準電圧を発生する基準電圧発生回
路と、前記基準電圧と前記スイッチ回路のスイッチON抵
抗に発生する電圧とを比較するコンパレータとかなる前
記スイッチ回路のスイッチON抵抗に発生する電圧を検出
するための電圧検出回路を含み、且つ前記二次電池の電
圧を検出し、前記二次電池の過放電状態及び過充電状態
を検出する機能を備え、 前記電圧検出回路の出力により前記スイッチ回路を制御
することを特徴とする充電式電源装置。1. A rechargeable power supply comprising: a switch circuit and a secondary battery connected in series to an external power supply terminal; and a charge / discharge control circuit connected in parallel to the secondary battery to control the switch circuit. Two transistors in which the switch circuit is connected in series
And the charge / discharge control circuit comprises a source and a drain of each of the two transistors.
A reference voltage generating circuit that generates a reference voltage that is trimmed to a product of the sum of the on-resistance between the source and the drain and the overcurrent value, and a reference voltage and a voltage that is generated in a switch ON resistance of the switch circuit. A voltage detection circuit for detecting a voltage generated at a switch ON resistance of the switch circuit serving as a comparator to be compared, and detecting a voltage of the secondary battery, an overdischarge state and an overcharge state of the secondary battery A rechargeable power supply device having a function of detecting the voltage of the power supply and controlling the switch circuit by an output of the voltage detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06575693A JP3278487B2 (en) | 1993-03-24 | 1993-03-24 | Rechargeable power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06575693A JP3278487B2 (en) | 1993-03-24 | 1993-03-24 | Rechargeable power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06284594A JPH06284594A (en) | 1994-10-07 |
| JP3278487B2 true JP3278487B2 (en) | 2002-04-30 |
Family
ID=13296198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06575693A Expired - Lifetime JP3278487B2 (en) | 1993-03-24 | 1993-03-24 | Rechargeable power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3278487B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879824A (en) * | 2018-06-19 | 2018-11-23 | 深圳市中微半导体有限公司 | A kind of integrated charge battery protection functional circuit |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3326324B2 (en) * | 1996-03-28 | 2002-09-24 | 三洋電機株式会社 | Secondary battery protection circuit |
| JP4555502B2 (en) * | 2001-04-24 | 2010-10-06 | セイコーインスツル株式会社 | Battery state monitoring circuit and battery device |
| JP2014169933A (en) * | 2013-03-04 | 2014-09-18 | Seiko Instruments Inc | Battery device |
| CN105305382A (en) * | 2015-11-23 | 2016-02-03 | 青岛歌尔声学科技有限公司 | Charge and discharge protective circuit for battery |
| GB2551081B (en) * | 2017-08-18 | 2018-12-19 | O2Micro Inc | Fault detection for battery management systems |
| US20230095740A1 (en) | 2020-04-01 | 2023-03-30 | Panasonic Intellectual Property Management Co., Ltd. | Electricity storage pack, electric mobile body, and charging device |
-
1993
- 1993-03-24 JP JP06575693A patent/JP3278487B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879824A (en) * | 2018-06-19 | 2018-11-23 | 深圳市中微半导体有限公司 | A kind of integrated charge battery protection functional circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06284594A (en) | 1994-10-07 |
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