JP2004274871A - Charging circuit - Google Patents

Charging circuit Download PDF

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Publication number
JP2004274871A
JP2004274871A JP2003061581A JP2003061581A JP2004274871A JP 2004274871 A JP2004274871 A JP 2004274871A JP 2003061581 A JP2003061581 A JP 2003061581A JP 2003061581 A JP2003061581 A JP 2003061581A JP 2004274871 A JP2004274871 A JP 2004274871A
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Japan
Prior art keywords
voltage
thermistor
power supply
charging
secondary battery
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JP2003061581A
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Japanese (ja)
Inventor
Hisashi Tokuda
尚志 徳田
Katsuya Sakuma
勝也 佐久間
Kazuhiro Oshita
和洋 大下
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Mitsumi Electric Co Ltd
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Mitsumi Electric Co Ltd
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Priority to JP2003061581A priority Critical patent/JP2004274871A/en
Publication of JP2004274871A publication Critical patent/JP2004274871A/en
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    • 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

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a circuit configuration in a charging circuit for charging a secondary battery. <P>SOLUTION: The charging circuit connected to a constant-voltage power source (3) charges the secondary battery (6) by the voltage of the constant-voltage power source. The charging circuit includes a thermistor (7a) for detecting the temperature of the secondary battery as the change of a resistance value, a current source (CS) connected directly to the one end of the thermistor to supply constant current to the thermistor, a voltage detector (WIC and 8a) for detecting the drop of the voltage of the one end of the thermistor to a predetermined low voltage or lower, and a charging controller (8b and 5) for stopping the charging of the secondary battery by the voltage of the constant-voltage power source when the voltage detector detects the drop of the voltage to the predetermined low voltage or lower. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、２次電池を充電する充電回路に関するものである。
【０００２】
【従来の技術】
特許文献１には、２次電池と、この２次電池の温度を検出する温度検出素子（サーミスタ）とを内蔵した電池セルと、上記２次電池を準定電流方式で充電する充電回路部と、上記温度検出素子が上記２次電池の温度上昇を検出した時該充電回路部の充電を停止せしめる充電停止用スイッチング素子とを有する充電器とを備えたことを特徴とする充電システムが開示されている。
【０００３】
また、非特許文献１には、別の構成を有する充電回路が開示されている。
【０００４】
【特許文献１】
特開平６−２８４５９１号公報（図２）。
【０００５】
【非特許文献１】
三菱集積回路＜標準リニアＩＣ＞ Ｍ６２２５３ＢＧＰ リチウムイオン電池用充電制御ＩＣのカタログ。
【０００６】
【発明が解決しようとする課題】
図２には、上記特許文献１の図２に開示された充電システムが示されている。この充電システムは、定電圧電源３の電源電圧によって２次電池６を充電するためのものであり、定電圧電源３の電源電圧による２次電池６の充電を制御する充電制御部（ＰＮＰトランジスタ８ｂ及びダイオード５）と、一端が抵抗器８ｃを介してダイオード５と２次電池６正極との接続点に接続され、他端が接地された、２次電池６の温度を抵抗値の変化として検出するサーミスタ７ａと、２次電池６の温度上昇により、サーミスタ７ａの抵抗値が減少し、抵抗器８ｃ及びサーミスタ７ａの分圧比が変化するとオフするＮＰＮトランジスタ８ａとを有し、ＮＰＮトランジスタ８ａがオフすると前記充電制御部のＰＮＰトランジスタ８ｂがオフし、定電圧電源３の電源電圧による２次電池６の充電が停止される。
【０００７】
このように、２次電池６を有する電池セル２に内蔵されたサーミスタ７ａで２次電池６の温度上昇を検出して２次電池６の過充電を防止している。
【０００８】
しかしながら、この方法では、サーミスタ７ａの一端が、抵抗器８ｃを介して、ダイオード５と２次電池６正極との接続点に接続されているため、電池電圧の値により、検出する温度が一定とならないという問題があった。
【０００９】
図３には、上記非特許文献１に開示された充電回路が示されている。この充電回路は、図２での電池電圧の影響を無くすため、ＶＤＤ端子を有する基準電圧部（安定化電源）５０を設けて、ＶＤＤ端子へ抵抗器８ｃを接続して、基準電圧部（安定化電源）５０を抵抗器８ｃとサーミスタ７ａとの分圧の電源として使用する。
【００１０】
これにより、電池電圧の影響なく温度検出を安定して行うことができる。
【００１１】
しかしながら、電圧源としての基準電圧部（安定化電源）５０からＶＤＤ電圧をサーミスタ７ａの一端に印加する構造であるため、基準電圧部（安定化電源）５０とサーミスタ７ａの一端との間に抵抗器８ｃを介在させる必要があり、回路構成が複雑である。
【００１２】
本発明の課題は、上記に鑑み、簡単な回路構成の充電回路を提供することにある。
【００１３】
【課題を解決するための手段】
本発明によれば、定電圧電源（３）に接続され、該定電圧電源の電源電圧によって２次電池（６）を充電する充電回路において、
前記２次電池の温度を抵抗値の変化として検出するサーミスタ（７ａ）と、
前記サーミスタの一端に直接接続され、前記サーミスタに定電流を供給する電流源（ＣＳ）と、
前記サーミスタの前記一端の電圧が所定の低電圧以下に降下したことを検出する電圧検出部（ＷＩＣ及び８ａ）と、
前記電圧検出部が前記所定の低電圧以下に降下したことを検出したとき、前記定電圧電源の電源電圧による前記２次電池の充電を停止する充電制御部（８ｂ及び５）とを有することを特徴とする充電回路が得られる。
【００１４】
【発明の実施の形態】
次に本発明の実施例について図面を参照して説明する。
【００１５】
図１を参照すると、本発明の一実施例による充電回路が示されている。この充電回路は、定電圧電源３に接続され、定電圧電源３のＶＣＣ端子の電源電圧ＶＣＣによって、電池セル２に内蔵された２次電池６を充電するものである。
【００１６】
この充電回路は、サーミスタ７ａと、電流源ＣＳと、ウインド形比較器ＷＩＣと、ＮＰＮトランジスタ８ａと、抵抗器４、充電制御部（ＰＮＰトランジスタ８ｂ及びダイオード５）とを有する。
【００１７】
サーミスタ７ａは、図２及び図３と同様に、電池セル２に内蔵され、２次電池６の温度を抵抗値の変化として検出するものである。
【００１８】
電流源ＣＳは、一方の端子を定電圧電源３のＶＣＣ端子に直接接続される（すなわち、一方の端子に電源電圧ＶＣＣが直接印加される）と共に、他方の端子をサーミスタ７ａの一端に直接接続され、サーミスタ７ａに定電流を供給するものである。
【００１９】
ウインド形比較器（ウインドコンパレータ）ＷＩＣは、高温検出用コンパレータＣｈｔと低温検出用コンパレータＣｌｔとを有する。
【００２０】
高温検出用コンパレータＣｈｔは、２次電池６の例えば７５℃という高温を、サーミスタ７ａの前記一端の電圧を所定の低電圧（下限基準電圧）Ｖｒｅｆ（Ｌ）に比較することにより、検出しようとするものである。高温検出用コンパレータＣｈｔは、サーミスタ７ａの前記一端の電圧が所定の低電圧（下限基準電圧）Ｖｒｅｆ（Ｌ）以下のとき、ロウレベル信号を出力し、ＮＰＮトランジスタ８ａをオフにする。ＮＰＮトランジスタ８ａがオフすると、ＰＮＰトランジスタ８ｂがオフし、定電圧電源３のＶＣＣ端子の電源電圧ＶＣＣによる２次電池６の充電が停止される。なお、高温検出用コンパレータＣｈｔは、上記以外のときは、ハイレベル信号を出力している。
【００２１】
低温検出用コンパレータＣｌｔは、２次電池６の例えば０℃という低温を、サーミスタ７ａの前記一端の電圧を所定の高電圧（上限基準電圧）Ｖｒｅｆ（Ｈ）に比較することにより、検出しようとするものである。なお、所定の高電圧（上限基準電圧）Ｖｒｅｆ（Ｈ）は、所定の低電圧Ｖｒｅｆ（Ｌ）よりも高い。低温検出用コンパレータＣｌｔは、サーミスタ７ａの前記一端の電圧が所定の高電圧（上限基準電圧）Ｖｒｅｆ（Ｈ）以下のとき（すなわち、２次電池６の温度が例えば０℃以上のとき）に、ハイレベル信号を出力するので、ＮＰＮトランジスタ８ａはオンであり、ＰＮＰトランジスタ８ｂもオンであり、定電圧電源３のＶＣＣ端子の電源電圧ＶＣＣによる２次電池６の充電が行われている。なお、低温検出用コンパレータＣｌｔは、それ以外のときは、ロウレベル信号を出力している。
【００２２】
このように、電圧検出部（ウインド形比較器ＷＩＣ及びＮＰＮトランジスタ８ａ）は、サーミスタ７ａの前記一端の電圧が所定の低電圧Ｖｒｅｆ（Ｌ）以下に降下したことを検出する。充電制御部（ＰＮＰトランジスタ８ｂ及びダイオード５）は、前記電圧検出部（ＷＩＣ及び８ａ）が所定の低電圧Ｖｒｅｆ（Ｌ）以下に降下したことを検出したとき、前記定電圧電源３の電源電圧ＶＣＣによる２次電池６の充電を停止する。
【００２３】
前記電圧検出部（ＷＩＣ及び８ａ）は、サーミスタの前記一端の電圧が、所定の低電圧Ｖｒｅｆ（Ｌ）より高い所定の高電圧Ｖｒｅｆ（Ｈ）以下であることも検出する。この場合、前記充電制御部（ＰＮＰトランジスタ８ｂ及びダイオード５）は、前記電圧検出部（ＷＩＣ及び８ａ）が所定の高電圧Ｖｒｅｆ（Ｈ）以下であり、かつ、所定の低電圧Ｖｒｅｆ（Ｌ）よりは高いことを検出している間に、前記定電圧電源３の電源電圧ＶＣＣによる２次電池６の充電を行う。
【００２４】
なお、ウインド形比較器ＷＩＣの高温検出用コンパレータＣｈｔ及び低温検出用コンパレータＣｌｔとしては、微少温度変動によるチャタリングによる誤動作を防止するため、ヒステリシスを有するコンパレータを使用している。
【００２５】
【発明の効果】
以上説明したように本発明によれば、基準電圧部（安定化電源）（５０）の代りに電流源（ＣＳ）を使用したので、基準電圧部（安定化電源）（５０）とサーミスタ（７ａ）の一端との間に抵抗器（８ｃ）を介在させる必要がなくなり、回路構成が簡単となり、２次電池（６）の過充電や加熱の防止を簡単な回路構成で実現することができる。
【図面の簡単な説明】
【図１】本発明の一実施例による充電回路のブロック図である。
【図２】上記特許文献１の図２に開示された充電システムのブロック図である。
【図３】上記非特許文献１に開示された充電回路のブロック図である。
【符号の説明】
２ 電池セル
３ 定電圧電源
４ 抵抗器
５ ダイオード
６ ２次電池
７ａ サーミスタ
８ａ ＮＰＮトランジスタ
８ｂ ＰＮＰトランジスタ
８ｃ 抵抗器
５０ 基準電圧部（安定化電源）
ＣＳ 電流源
ＷＩＣ ウインド形比較器
Ｃｈｔ 高温検出用コンパレータ
Ｃｌｔ 低温検出用コンパレータ
Ｖｒｅｆ（Ｌ） 所定の低電圧（下限基準電圧）
Ｖｒｅｆ（Ｈ） 所定の高電圧（上限基準電圧）[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a charging circuit for charging a secondary battery.
[0002]
[Prior art]
Patent Document 1 discloses a battery cell including a secondary battery, a temperature detecting element (thermistor) for detecting the temperature of the secondary battery, and a charging circuit unit for charging the secondary battery by a quasi-constant current method. A charger having a switching element for stopping charging of the charging circuit when the temperature detecting element detects a rise in temperature of the secondary battery. ing.
[0003]
Non-Patent Document 1 discloses a charging circuit having another configuration.
[0004]
[Patent Document 1]
JP-A-6-284591 (FIG. 2).
[0005]
[Non-patent document 1]
Mitsubishi Integrated Circuits <Standard Linear IC> M62253BGP Catalog of charge control ICs for lithium ion batteries.
[0006]
[Problems to be solved by the invention]
FIG. 2 shows the charging system disclosed in FIG. 2 of Patent Document 1. This charging system is for charging the secondary battery 6 with the power supply voltage of the constant voltage power supply 3, and controls the charging of the secondary battery 6 with the power supply voltage of the constant voltage power supply 3 (PNP transistor 8b). And a diode 5), one end of which is connected to a connection point between the diode 5 and the positive electrode of the secondary battery 6 via the resistor 8c, and the other end of which is grounded, and detects the temperature of the secondary battery 6 as a change in resistance value. And the NPN transistor 8a that turns off when the resistance value of the thermistor 7a decreases due to the temperature rise of the secondary battery 6 and the voltage dividing ratio of the resistor 8c and the thermistor 7a changes. The NPN transistor 8a turns off. Then, the PNP transistor 8b of the charge control unit is turned off, and the charging of the secondary battery 6 by the power supply voltage of the constant voltage power supply 3 is stopped.
[0007]
As described above, the temperature rise of the secondary battery 6 is detected by the thermistor 7a built in the battery cell 2 having the secondary battery 6, thereby preventing the secondary battery 6 from being overcharged.
[0008]
However, in this method, one end of the thermistor 7a is connected to the connection point between the diode 5 and the positive electrode of the secondary battery 6 via the resistor 8c. There was a problem that did not become.
[0009]
FIG. 3 shows a charging circuit disclosed in Non-Patent Document 1. This charging circuit is provided with a reference voltage section (stabilized power supply) 50 having a VDD terminal and connecting a resistor 8c to the VDD terminal to eliminate the influence of the battery voltage in FIG. The power supply 50 is used as a power supply for dividing the voltage of the resistor 8c and the thermistor 7a.
[0010]
Thereby, temperature detection can be performed stably without being affected by the battery voltage.
[0011]
However, since the VDD voltage is applied to one end of the thermistor 7a from the reference voltage unit (stabilized power supply) 50 as a voltage source, a resistor is provided between the reference voltage unit (stabilized power supply) 50 and one end of the thermistor 7a. The circuit 8c needs to be interposed, and the circuit configuration is complicated.
[0012]
In view of the above, an object of the present invention is to provide a charging circuit having a simple circuit configuration.
[0013]
[Means for Solving the Problems]
According to the present invention, in a charging circuit connected to a constant voltage power supply (3) and charging a secondary battery (6) with a power supply voltage of the constant voltage power supply,
A thermistor (7a) for detecting the temperature of the secondary battery as a change in resistance value;
A current source (CS) directly connected to one end of the thermistor and supplying a constant current to the thermistor;
A voltage detector (WIC and 8a) for detecting that the voltage at the one end of the thermistor has dropped below a predetermined low voltage;
A charge control unit (8b and 5) for stopping charging of the secondary battery by a power supply voltage of the constant voltage power supply when the voltage detection unit detects that the voltage has dropped below the predetermined low voltage. A characteristic charging circuit is obtained.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0015]
Referring to FIG. 1, there is shown a charging circuit according to one embodiment of the present invention. This charging circuit is connected to the constant voltage power supply 3 and charges the secondary battery 6 built in the battery cell 2 with the power supply voltage VCC of the VCC terminal of the constant voltage power supply 3.
[0016]
This charging circuit includes a thermistor 7a, a current source CS, a window comparator WIC, an NPN transistor 8a, a resistor 4, and a charge control unit (PNP transistor 8b and diode 5).
[0017]
2 and 3, the thermistor 7a is built in the battery cell 2 and detects the temperature of the secondary battery 6 as a change in resistance value.
[0018]
The current source CS has one terminal directly connected to the VCC terminal of the constant voltage power supply 3 (that is, the power supply voltage VCC is directly applied to one terminal), and the other terminal directly connected to one end of the thermistor 7a. Then, a constant current is supplied to the thermistor 7a.
[0019]
The window comparator (window comparator) WIC has a comparator Cht for detecting high temperature and a comparator Clt for detecting low temperature.
[0020]
The high-temperature detection comparator Cht attempts to detect a high temperature of, for example, 75 ° C. of the secondary battery 6 by comparing the voltage at the one end of the thermistor 7 a to a predetermined low voltage (lower-limit reference voltage) Vref (L). Things. The high temperature detection comparator Cht outputs a low level signal when the voltage at the one end of the thermistor 7a is equal to or lower than a predetermined low voltage (lower limit reference voltage) Vref (L), and turns off the NPN transistor 8a. When the NPN transistor 8a turns off, the PNP transistor 8b turns off, and charging of the secondary battery 6 by the power supply voltage VCC at the VCC terminal of the constant voltage power supply 3 is stopped. The high-temperature detection comparator Cht outputs a high-level signal at times other than the above.
[0021]
The low-temperature detection comparator Clt attempts to detect a low temperature of, for example, 0 ° C. of the secondary battery 6 by comparing the voltage at the one end of the thermistor 7 a to a predetermined high voltage (upper-limit reference voltage) Vref (H). Things. The predetermined high voltage (upper limit reference voltage) Vref (H) is higher than the predetermined low voltage Vref (L). When the voltage at the one end of the thermistor 7a is equal to or lower than a predetermined high voltage (upper-limit reference voltage) Vref (H) (that is, when the temperature of the secondary battery 6 is equal to or higher than 0 ° C., for example), Since a high level signal is output, the NPN transistor 8a is on and the PNP transistor 8b is also on, and the secondary battery 6 is being charged by the power supply voltage VCC of the VCC terminal of the constant voltage power supply 3. In other cases, the low-temperature detection comparator Clt outputs a low-level signal.
[0022]
As described above, the voltage detector (the window comparator WIC and the NPN transistor 8a) detects that the voltage at the one end of the thermistor 7a has dropped below the predetermined low voltage Vref (L). When the charge control unit (PNP transistor 8b and diode 5) detects that the voltage detection units (WIC and 8a) have dropped below a predetermined low voltage Vref (L), the power supply voltage VCC of the constant voltage power supply 3 Charging of the secondary battery 6 is stopped.
[0023]
The voltage detectors (WIC and 8a) also detect that the voltage at the one end of the thermistor is equal to or lower than a predetermined high voltage Vref (H) higher than a predetermined low voltage Vref (L). In this case, the charge control unit (PNP transistor 8b and diode 5) determines that the voltage detection unit (WIC and 8a) is lower than the predetermined high voltage Vref (H) and lower than the predetermined low voltage Vref (L). Charge the secondary battery 6 with the power supply voltage VCC of the constant voltage power supply 3 while detecting that the voltage is high.
[0024]
As the high-temperature detection comparator Cht and the low-temperature detection comparator Clt of the window comparator WIC, comparators having hysteresis are used in order to prevent malfunction due to chattering due to minute temperature fluctuation.
[0025]
【The invention's effect】
As described above, according to the present invention, since the current source (CS) is used instead of the reference voltage section (stabilized power supply) (50), the reference voltage section (stabilized power supply) (50) and the thermistor (7a) are used. ) Eliminates the need for interposing a resistor (8c) between the first and second terminals, thereby simplifying the circuit configuration and preventing overcharge and heating of the secondary battery (6) with a simple circuit configuration.
[Brief description of the drawings]
FIG. 1 is a block diagram of a charging circuit according to one embodiment of the present invention.
FIG. 2 is a block diagram of a charging system disclosed in FIG. 2 of Patent Document 1;
FIG. 3 is a block diagram of a charging circuit disclosed in Non-Patent Document 1.
[Explanation of symbols]
2 Battery cell 3 Constant voltage power supply 4 Resistor 5 Diode 6 Secondary battery 7a Thermistor 8a NPN transistor 8b PNP transistor 8c Resistor 50 Reference voltage section (stabilized power supply)
CS Current source WIC Window comparator Cht High temperature detection comparator Clt Low temperature detection comparator Vref (L) Predetermined low voltage (lower limit reference voltage)
Vref (H) Predetermined high voltage (upper limit reference voltage)

Claims (3)

定電圧電源に接続され、該定電圧電源の電源電圧によって２次電池を充電する充電回路において、
前記２次電池の温度を抵抗値の変化として検出するサーミスタと、
前記サーミスタの一端に直接接続され、前記サーミスタに定電流を供給する電流源と、
前記サーミスタの前記一端の電圧が所定の低電圧以下に降下したことを検出する電圧検出部と、
前記電圧検出部が前記所定の低電圧以下に降下したことを検出したとき、前記定電圧電源の電源電圧による前記２次電池の充電を停止する充電制御部とを有することを特徴とする充電回路。In a charging circuit connected to a constant voltage power supply and charging a secondary battery with a power supply voltage of the constant voltage power supply,
A thermistor that detects the temperature of the secondary battery as a change in resistance value;
A current source that is directly connected to one end of the thermistor and supplies a constant current to the thermistor;
A voltage detection unit that detects that the voltage of the one end of the thermistor has dropped below a predetermined low voltage,
A charging control unit that stops charging of the secondary battery with a power supply voltage of the constant voltage power supply when the voltage detection unit detects that the voltage has dropped below the predetermined low voltage. . 請求項１に記載の充電回路において、
前記電流源は、一方の端子を前記定電圧電源に直接接続されると共に、他方の端子を前記サーミスタの前記一端に直接接続され、前記サーミスタに定電流を供給するものであることを特徴とする充電回路。The charging circuit according to claim 1,
The current source has one terminal connected directly to the constant voltage power supply, and the other terminal connected directly to the one end of the thermistor to supply a constant current to the thermistor. Charging circuit. 請求項１又は２に記載の充電回路において、
前記電圧検出部は、前記サーミスタの前記一端の電圧が前記所定の低電圧より高い所定の高電圧以下であることも検出するものであり、
前記充電制御部は、前記電圧検出部が前記所定の高電圧以下であり、かつ、前記所定の低電圧よりは高いことを検出している間に、前記定電圧電源の電源電圧による前記２次電池の充電を行うことを特徴とする充電回路。The charging circuit according to claim 1 or 2,
The voltage detector is also for detecting that the voltage of the one end of the thermistor is equal to or lower than a predetermined high voltage higher than the predetermined low voltage,
The charging control unit is configured to perform the secondary operation using the power supply voltage of the constant voltage power supply while the voltage detection unit detects that the voltage is equal to or lower than the predetermined high voltage and is higher than the predetermined low voltage. A charging circuit for charging a battery.
JP2003061581A 2003-03-07 2003-03-07 Charging circuit Withdrawn JP2004274871A (en)

Priority Applications (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009005097A1 (en) * 2007-07-05 2009-01-08 Mitsumi Electric Co., Ltd. Secondary battery recharge control circuit and recharge control device using the same
US7541780B2 (en) 2004-10-18 2009-06-02 Nec Corporation Charge controlling circuit, charge controlling method, and electronic device provided with same charge controlling circuit
JP2012220242A (en) * 2011-04-05 2012-11-12 Yokogawa Electric Corp Electronic apparatus having short circuit detector

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7541780B2 (en) 2004-10-18 2009-06-02 Nec Corporation Charge controlling circuit, charge controlling method, and electronic device provided with same charge controlling circuit
WO2009005097A1 (en) * 2007-07-05 2009-01-08 Mitsumi Electric Co., Ltd. Secondary battery recharge control circuit and recharge control device using the same
KR101079125B1 (en) * 2007-07-05 2011-11-02 미쓰미덴기가부시기가이샤 Secondary battery recharge control circuit and recharge control device using the same
US8860376B2 (en) 2007-07-05 2014-10-14 Mitsumi Electric Co., Ltd. Semiconductor integrated circuit device, electronic apparatus, and charging controller for secondary battery
JP2012220242A (en) * 2011-04-05 2012-11-12 Yokogawa Electric Corp Electronic apparatus having short circuit detector

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