JP2009177937A - Charge/discharge control circuit - Google Patents

Charge/discharge control circuit Download PDF

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JP2009177937A
JP2009177937A JP2008013476A JP2008013476A JP2009177937A JP 2009177937 A JP2009177937 A JP 2009177937A JP 2008013476 A JP2008013476 A JP 2008013476A JP 2008013476 A JP2008013476 A JP 2008013476A JP 2009177937 A JP2009177937 A JP 2009177937A
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terminal
battery
voltage
charger
mos
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JP5265934B2 (en
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Tomoyuki Koike
智幸 小池
Atsushi Sakurai
敦司 桜井
Kazusuke Sano
和亮 佐野
Yoshihisa Taya
良久 田家
Seiji Yoshikawa
清至 吉川
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Seiko Instruments Inc
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Seiko Instruments Inc
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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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Abstract

<P>PROBLEM TO BE SOLVED: To provide a charge/discharge control circuit capable of enhancing safety against a battery. <P>SOLUTION: A voltage of a detection terminal VM when a charger reverse-connection detection circuit detects that a polarity of the charger is reversely-connected to the battery 200 is not higher than a power supply voltage VDD i.e., it is a predetermined voltage lower than the power supply voltage VDD. Consequently, a time required for detection by the charger reverse-connection detection circuit is shortened by the predetermined voltage, so that a detection speed by the charger reverse-connection detection circuit is made faster. Accordingly, discharge stops immediately and hence safety against the battery 200 increases. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、充放電経路に第一ＭＯＳ及び第二ＭＯＳが設けられるバッテリの充放電を制御する充放電制御回路に関する。   The present invention relates to a charge / discharge control circuit that controls charge / discharge of a battery in which a first MOS and a second MOS are provided in a charge / discharge path.

現在、様々な携帯型電子機器が、普及している。これらの携帯型電子機器は、通常、バッテリを搭載したバッテリパックによって駆動されている。   Currently, various portable electronic devices are in widespread use. These portable electronic devices are usually driven by a battery pack equipped with a battery.

携帯型電子機器が使用される場合、バッテリは携帯型電子機器に接続され、バッテリが充電される場合、バッテリは充電器に接続される。ここで、バッテリの危険状態として、バッテリの充電時にバッテリに充電器が極性を逆に接続される充電器逆接続状態がある。   When a portable electronic device is used, the battery is connected to the portable electronic device, and when the battery is charged, the battery is connected to a charger. Here, as a dangerous state of the battery, there is a charger reverse connection state in which the charger is reversely connected to the battery when the battery is charged.

この対策とし、バッテリに充電器が極性を逆に接続され、検出端子の電圧が電源電圧よりも高くなると、バッテリの放電が停止する技術が提案されている（例えば、特許文献１参照）。
特開２００６−２１００２６号公報 As a countermeasure against this, a technique has been proposed in which discharging of the battery is stopped when the charger is connected to the battery with the polarity reversed and the voltage at the detection terminal becomes higher than the power supply voltage (see, for example, Patent Document 1).
JP 2006-210026 JP

しかし、検出端子の電圧が電源電圧よりも高くなると、検出端子及び電源端子の間の寄生ダイオードに電流が流れ、他の回路が誤動作する可能性がある。   However, when the voltage at the detection terminal becomes higher than the power supply voltage, a current flows through a parasitic diode between the detection terminal and the power supply terminal, and other circuits may malfunction.

また、検出端子の電圧が電源電圧よりも高くなってバッテリの放電が停止するまでの待機時間が存在してしまう。よって、バッテリの危険状態が継続する時間が長くなってしまう。よって、バッテリに対する安全性が低くなっている。   In addition, there is a waiting time until the voltage at the detection terminal becomes higher than the power supply voltage and the battery discharge is stopped. Therefore, the time during which the dangerous state of the battery continues is prolonged. Therefore, the safety for the battery is low.

上記のようなことを防止するため、バッテリに対する安全性を高くできる、バッテリの充放電を制御する充放電制御回路が求められている。   In order to prevent the above, there is a need for a charge / discharge control circuit that controls charge / discharge of a battery, which can increase the safety of the battery.

本発明は、上記課題に鑑みてなされ、バッテリに対する安全性を高くできる充放電制御回路を提供する。   This invention is made in view of the said subject, and provides the charging / discharging control circuit which can raise the safety | security with respect to a battery.

本発明は、上記課題を解決するため、充放電経路に第一ＭＯＳ及び第二ＭＯＳが設けられるバッテリの充放電を制御する充放電制御回路において、前記バッテリに充電器が極性を逆に接続されることを検出するための検出端子と、前記検出端子の電圧が電源電圧よりも低い所定電圧になると、オンすると電流を流してオフすると寄生ダイオードによる放電電流だけを流す前記第一ＭＯＳがオンするよう動作し、オンすると電流を流してオフすると寄生ダイオードによる充電電流だけを流す前記第二ＭＯＳがオフするよう動作し、前記バッテリの放電を停止させる充電器逆接続検出回路と、を備えることを特徴とする充放電制御回路を提供する。   In order to solve the above-described problems, the present invention provides a charge / discharge control circuit for controlling charge / discharge of a battery in which a first MOS and a second MOS are provided in a charge / discharge path, wherein a charger is connected to the battery with a reverse polarity. When the voltage at the detection terminal and the detection terminal is lower than the power supply voltage, the first MOS is turned on and the first MOS is turned on and only the discharge current due to the parasitic diode is turned on. And a charger reverse connection detection circuit that operates to turn off the second MOS that flows only the charging current due to the parasitic diode when turned off and turns off, and stops discharging of the battery. A charge / discharge control circuit is provided.

本発明では、バッテリに充電器が極性を逆に接続されることが充電器逆接続検出回路によって検出される時の検出端子の電圧が、電源電圧よりも高い電圧でなくて電源電圧よりも低い所定電圧である。よって、その分、充電器逆接続検出回路によって検出するための時間が短くなり、充電器逆接続検出回路による検出速度が速くなる。よって、放電が直ちに停止するので、バッテリに対する安全性が高くなる。   In the present invention, when the charger reverse connection detection circuit detects that the charger is reversely connected to the battery, the voltage at the detection terminal is not higher than the power supply voltage but lower than the power supply voltage. It is a predetermined voltage. Therefore, the time for detection by the charger reverse connection detection circuit is shortened accordingly, and the detection speed by the charger reverse connection detection circuit is increased. Therefore, since the discharge stops immediately, the safety for the battery is increased.

以下、本発明の実施形態を、図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the drawings.

まず、バッテリパックの構成について説明する。図１は、バッテリパックを示すブロック図である。図２は、充放電制御回路を示すブロック図である。   First, the configuration of the battery pack will be described. FIG. 1 is a block diagram showing a battery pack. FIG. 2 is a block diagram showing a charge / discharge control circuit.

バッテリパックは、負荷（図示せず）に電源電圧を供給し、また、充電器（図示せず）によって充電される。保護回路１００は、バッテリ２００を保護する。充放電制御回路１１０は、ＭＯＳ１２０及びＭＯＳ１３０をオンオフ制御することにより、バッテリ２００の充放電を制御する。   The battery pack supplies a power supply voltage to a load (not shown) and is charged by a charger (not shown). The protection circuit 100 protects the battery 200. The charge / discharge control circuit 110 controls charging / discharging of the battery 200 by controlling on / off of the MOS 120 and the MOS 130.

バッテリパックは、保護回路１００及びバッテリ２００を有する。バッテリパックは、端子ＥＢ＋及び端子ＥＢ−を有する。保護回路１００は、充放電制御回路１１０とＭＯＳ１２０とＭＯＳ１３０とを有する。充放電制御回路１１０は、過充電検出回路１１１、過放電検出回路１１２、過電流検出回路１１３、遅延回路１１５、充電器逆接続検出回路１１６、及び、ロジック回路１１７を備える。充放電制御回路１１０は、電源端子ＶＤＤ、接地端子ＶＳＳ、制御端子ＤＯ、制御端子ＣＯ、及び、検出端子ＶＭを備える。   The battery pack includes a protection circuit 100 and a battery 200. The battery pack has a terminal EB + and a terminal EB−. The protection circuit 100 includes a charge / discharge control circuit 110, a MOS 120, and a MOS 130. The charge / discharge control circuit 110 includes an overcharge detection circuit 111, an overdischarge detection circuit 112, an overcurrent detection circuit 113, a delay circuit 115, a charger reverse connection detection circuit 116, and a logic circuit 117. The charge / discharge control circuit 110 includes a power supply terminal VDD, a ground terminal VSS, a control terminal DO, a control terminal CO, and a detection terminal VM.

バッテリ２００は、正極端子が端子ＥＢ＋及び電源端子ＶＤＤに接続され、負極端子が接地端子ＶＳＳに接続され、負極端子が端子ＥＢ−にＭＯＳ１２０及びＭＯＳ１３０を介して接続される。充放電制御回路１１０は、制御端子ＤＯがＭＯＳ１３０に接続され、制御端子ＣＯがＭＯＳ１２０に接続され、検出端子ＶＭが端子ＥＢ−に接続される。過充電検出回路１１１は、一端が電源端子ＶＤＤに接続され、他端が遅延回路１１５の第一入力端子に接続される。過放電検出回路１１２は、一端が電源端子ＶＤＤに接続され、他端が遅延回路１１５の第二入力端子に接続される。過電流検出回路１１３は、一端が検出端子ＶＭに接続され、他端が遅延回路１１５の第三入力端子に接続される。遅延回路１１５は、出力端子がロジック回路１１７第一入力端子に接続される。充電器逆接続検出回路１１６は、一端が検出端子ＶＭに接続され、他端がロジック回路１１７の第二入力端子に接続される。ロジック回路１１７は、第一出力端子が制御端子ＣＯに接続され、第二出力端子が制御端子ＤＯに接続される。また、充電器または負荷が、端子ＥＢ＋及び端子ＥＢ−の間に接続される。   The battery 200 has a positive terminal connected to the terminal EB + and the power supply terminal VDD, a negative terminal connected to the ground terminal VSS, and a negative terminal connected to the terminal EB− via the MOS 120 and the MOS 130. In the charge / discharge control circuit 110, the control terminal DO is connected to the MOS 130, the control terminal CO is connected to the MOS 120, and the detection terminal VM is connected to the terminal EB-. The overcharge detection circuit 111 has one end connected to the power supply terminal VDD and the other end connected to the first input terminal of the delay circuit 115. The overdischarge detection circuit 112 has one end connected to the power supply terminal VDD and the other end connected to the second input terminal of the delay circuit 115. The overcurrent detection circuit 113 has one end connected to the detection terminal VM and the other end connected to the third input terminal of the delay circuit 115. The delay circuit 115 has an output terminal connected to the logic circuit 117 first input terminal. The charger reverse connection detection circuit 116 has one end connected to the detection terminal VM and the other end connected to the second input terminal of the logic circuit 117. The logic circuit 117 has a first output terminal connected to the control terminal CO and a second output terminal connected to the control terminal DO. A charger or a load is connected between the terminal EB + and the terminal EB−.

ここで、検出端子ＶＭは、バッテリ２００が過電流状態になることを検出するための端子である。また、検出端子ＶＭは、バッテリ２００に充電器が極性を逆に接続されることを検出するための端子である。   Here, the detection terminal VM is a terminal for detecting that the battery 200 is in an overcurrent state. The detection terminal VM is a terminal for detecting that the charger is connected to the battery 200 with the polarity reversed.

次に、充放電制御回路の動作について説明する。   Next, the operation of the charge / discharge control circuit will be described.

＜バッテリ２００が過充電状態になる場合＞
バッテリ２００の電圧が高くなって所定電圧以上になり、バッテリ２００が過充電状態になると、過充電検出回路１１１はバッテリ２００が過充電されたことを検出する。その後、バッテリ２００が過充電状態であるままで遅延回路１１５によって設定された遅延時間（例えば、１秒）が経過すると、つまり、バッテリ２００の過充電状態の時間が遅延時間以上になると、ロジック回路１１７はロー信号及びハイ信号をＭＯＳ１２０及びＭＯＳ１３０のゲートに出力する。すると、ＭＯＳ１２０がオフして寄生ダイオードによる放電電流だけを流し、ＭＯＳ１３０がオンして電流を流し、過充電検出回路１１１はバッテリ２００の充電を停止させる。 <When battery 200 is overcharged>
When the voltage of the battery 200 increases to a predetermined voltage or higher and the battery 200 is overcharged, the overcharge detection circuit 111 detects that the battery 200 is overcharged. Thereafter, when the delay time (for example, 1 second) set by the delay circuit 115 elapses while the battery 200 remains in the overcharge state, that is, when the overcharge state time of the battery 200 exceeds the delay time, the logic circuit 117 outputs a low signal and a high signal to the gates of the MOS 120 and the MOS 130. Then, the MOS 120 is turned off and only the discharge current due to the parasitic diode flows, the MOS 130 is turned on and the current flows, and the overcharge detection circuit 111 stops charging the battery 200.

＜バッテリ２００が過放電状態になる場合＞
バッテリ２００の電圧が低くなって所定電圧未満になり、バッテリ２００が過放電状態になると、過放電検出回路１１２はバッテリ２００が過放電したことを検出する。その後、バッテリ２００が過放電状態であるままで遅延回路１１５によって設定された遅延時間が経過すると、つまり、バッテリ２００の過放電状態の時間が遅延時間以上になると、ロジック回路１１７はハイ信号及びロー信号をＭＯＳ１２０及びＭＯＳ１３０のゲートに出力する。すると、ＭＯＳ１２０がオンして電流を流し、ＭＯＳ１３０がオフして寄生ダイオードによる充電電流だけを流し、過放電検出回路１１２はバッテリ２００の放電を停止させる。 <When battery 200 is in an overdischarged state>
When the voltage of the battery 200 becomes lower than a predetermined voltage and the battery 200 is overdischarged, the overdischarge detection circuit 112 detects that the battery 200 is overdischarged. Thereafter, when the delay time set by the delay circuit 115 elapses while the battery 200 remains in the overdischarged state, that is, when the time of the overdischarged state of the battery 200 exceeds the delay time, the logic circuit 117 A signal is output to the gates of the MOS 120 and the MOS 130. Then, the MOS 120 is turned on and current flows, the MOS 130 is turned off and only charging current due to the parasitic diode flows, and the overdischarge detection circuit 112 stops discharging the battery 200.

＜バッテリ２００が過電流状態になる場合＞
異常な電流が負荷に流れ、バッテリ２００が過電流状態になると、過電流検出回路１１３はバッテリ２００が過電流を流していることを検出する。その後、バッテリ２００が過電流状態であるままで遅延回路１１５によって設定された遅延時間が経過すると、つまり、バッテリ２００の過電流状態の時間が遅延時間以上になると、ロジック回路１１７はハイ信号及びロー信号をＭＯＳ１２０及びＭＯＳ１３０のゲートに出力する。すると、ＭＯＳ１２０がオンして電流を流し、ＭＯＳ１３０がオフして寄生ダイオードによる充電電流だけを流し、過電流検出回路１１３はバッテリ２００の放電を停止させる。 <When battery 200 is in an overcurrent state>
When an abnormal current flows through the load and the battery 200 enters an overcurrent state, the overcurrent detection circuit 113 detects that the battery 200 is flowing an overcurrent. After that, when the delay time set by the delay circuit 115 elapses while the battery 200 remains in the overcurrent state, that is, when the time of the overcurrent state of the battery 200 becomes equal to or longer than the delay time, the logic circuit 117 A signal is output to the gates of the MOS 120 and the MOS 130. Then, the MOS 120 is turned on and current flows, the MOS 130 is turned off and only the charging current due to the parasitic diode flows, and the overcurrent detection circuit 113 stops discharging the battery 200.

＜バッテリ２００に充電器が極性を逆に接続される場合＞
充電器がバッテリ２００に接続してバッテリ２００の充電が行われる場合、充電器の正極端子は端子ＥＢ＋に接続され、充電器の負極端子は端子ＥＢ−に接続されるが、充電器がバッテリ２００に誤って接続し、充電器の正極端子が端子ＥＢ−に接続され、充電器の負極端子が端子ＥＢ＋に接続される。つまり、充電器がバッテリ２００に極性を逆に接続される。すると、検出端子ＶＭ及び端子ＥＢ−の電圧は、通常、接地電圧ＶＳＳ付近であるが、バッテリ２００の電圧である電源電圧ＶＤＤ付近になってしまう。検出端子ＶＭの電圧が電源電圧ＶＤＤよりも低い所定電圧になると、充電器逆接続検出回路１１６はその旨を検出し、ロジック回路１１７はハイ信号及びロー信号をＭＯＳ１２０及びＭＯＳ１３０のゲートに出力する。すると、ＭＯＳ１２０がオンして電流を流し、ＭＯＳ１３０がオフして寄生ダイオードによる充電電流だけを流し、充電器逆接続検出回路１１６はバッテリ２００の放電を停止させる。 <When charger is connected to battery 200 with reverse polarity>
When the battery 200 is charged by connecting the charger to the battery 200, the positive terminal of the charger is connected to the terminal EB + and the negative terminal of the charger is connected to the terminal EB−. The positive terminal of the charger is connected to the terminal EB−, and the negative terminal of the charger is connected to the terminal EB +. That is, the charger is connected to the battery 200 with the polarity reversed. Then, the voltage at the detection terminal VM and the terminal EB− is usually near the ground voltage VSS, but near the power supply voltage VDD that is the voltage of the battery 200. When the voltage at the detection terminal VM becomes a predetermined voltage lower than the power supply voltage VDD, the charger reverse connection detection circuit 116 detects that fact, and the logic circuit 117 outputs a high signal and a low signal to the gates of the MOS 120 and the MOS 130. Then, the MOS 120 is turned on and current flows, the MOS 130 is turned off and only charging current due to the parasitic diode flows, and the charger reverse connection detection circuit 116 stops discharging the battery 200.

次に、第一実施形態の充電器逆接続検出回路の構成について説明する。図３は、第一実施形態の充電器逆接続検出回路を示す図である。   Next, the configuration of the charger reverse connection detection circuit of the first embodiment will be described. FIG. 3 is a diagram illustrating the charger reverse connection detection circuit according to the first embodiment.

充電器逆接続検出回路１１６は、インバータ２１を有する。   The charger reverse connection detection circuit 116 includes an inverter 21.

インバータ２１は、入力端子が検出端子ＶＭに接続され、出力端子がロジック回路１１７の第二入力端子に接続される。   The inverter 21 has an input terminal connected to the detection terminal VM and an output terminal connected to the second input terminal of the logic circuit 117.

ここで、インバータ２１の反転電圧は、電源電圧ＶＤＤよりも低い所定電圧である。例えば、インバータ２１の反転電圧は、電源電圧ＶＤＤから１ボルトを減算した電圧である。   Here, the inversion voltage of the inverter 21 is a predetermined voltage lower than the power supply voltage VDD. For example, the inverted voltage of the inverter 21 is a voltage obtained by subtracting 1 volt from the power supply voltage VDD.

次に、第一実施形態の充電器逆接続検出回路の動作について説明する。   Next, the operation of the charger reverse connection detection circuit of the first embodiment will be described.

検出端子ＶＭの電圧が電源電圧ＶＤＤ付近になってしまい、検出端子ＶＭの電圧が電源電圧ＶＤＤよりも低い所定電圧になると、インバータ２１の出力電圧は反転し、インバータ２１はロジック回路１１７の第二入力端子にロー信号を検出信号として出力する。   When the voltage of the detection terminal VM becomes near the power supply voltage VDD and the voltage of the detection terminal VM becomes a predetermined voltage lower than the power supply voltage VDD, the output voltage of the inverter 21 is inverted, and the inverter 21 is the second of the logic circuit 117. A low signal is output to the input terminal as a detection signal.

なお、充電器逆接続検出回路１１６による検出信号はロー信号であるが、インバータ２１の出力端子にインバータ（図示せず）が設けられることにより、検出信号はハイ信号でも良くなる。   Note that the detection signal from the charger reverse connection detection circuit 116 is a low signal, but the detection signal may be a high signal by providing an inverter (not shown) at the output terminal of the inverter 21.

次に、第二実施形態の充電器逆接続検出回路の構成について説明する。図４は、第二実施形態の充電器逆接続検出回路を示す図である。   Next, the configuration of the charger reverse connection detection circuit of the second embodiment will be described. FIG. 4 is a diagram illustrating a charger reverse connection detection circuit according to the second embodiment.

充電器逆接続検出回路１１６は、分圧回路３１、基準電圧回路３２、及び、コンパレータ３３を有する。   The charger reverse connection detection circuit 116 includes a voltage dividing circuit 31, a reference voltage circuit 32, and a comparator 33.

分圧回路３１は、入力端子が検出端子ＶＭに接続され、出力端子がコンパレータ３３の反転入力端子に接続される。基準電圧回路３２は、出力端子がコンパレータ３３の非反転入力端子に接続される。コンパレータ３３は、出力端子がロジック回路１１７の第二入力端子に接続される。   The voltage dividing circuit 31 has an input terminal connected to the detection terminal VM and an output terminal connected to the inverting input terminal of the comparator 33. The reference voltage circuit 32 has an output terminal connected to the non-inverting input terminal of the comparator 33. The comparator 33 has an output terminal connected to the second input terminal of the logic circuit 117.

次に、第二実施形態の充電器逆接続検出回路の動作について説明する。   Next, the operation of the charger reverse connection detection circuit of the second embodiment will be described.

検出端子ＶＭの電圧が電源電圧ＶＤＤ付近になってしまい、検出端子ＶＭの電圧が電源電圧ＶＤＤよりも低い所定電圧以上になると、分圧回路３１の出力電圧も高くなり、その出力電圧が基準電圧回路３２の基準電圧よりも高くなると、コンパレータ３３は出力電圧を反転し、コンパレータ３３はロジック回路１１７の第二入力端子にロー信号を検出信号として出力する。   When the voltage of the detection terminal VM becomes near the power supply voltage VDD and the voltage of the detection terminal VM becomes equal to or higher than a predetermined voltage lower than the power supply voltage VDD, the output voltage of the voltage dividing circuit 31 also increases, and the output voltage becomes the reference voltage. When the voltage becomes higher than the reference voltage of the circuit 32, the comparator 33 inverts the output voltage, and the comparator 33 outputs a low signal as a detection signal to the second input terminal of the logic circuit 117.

なお、充電器逆接続検出回路１１６による検出信号はロー信号であるが、コンパレータ３３の反転入力端子と非反転入力端子とが交換されることやコンパレータ３３の出力端子にインバータ（図示せず）が設けられることにより、検出信号はハイ信号でも良くなる。   The detection signal from the charger reverse connection detection circuit 116 is a low signal. However, the inverting input terminal and the non-inverting input terminal of the comparator 33 are exchanged, and an inverter (not shown) is connected to the output terminal of the comparator 33. By being provided, the detection signal may be a high signal.

このようにすると、バッテリ２００に充電器が極性を逆に接続されることが充電器逆接続検出回路１１６によって検出される時の検出端子ＶＭの電圧が、電源電圧ＶＤＤよりも高い電圧でなくて電源電圧ＶＤＤよりも低い所定電圧である。よって、その分、充電器逆接続検出回路１１６によって検出するための時間が短くなり、充電器逆接続検出回路１１６による検出速度が速くなる。よって、放電が直ちに停止するので、バッテリ２００に対する安全性が高くなる。   In this case, the voltage at the detection terminal VM when the charger reverse connection detection circuit 116 detects that the charger is connected to the battery 200 with the reverse polarity is not higher than the power supply voltage VDD. The predetermined voltage is lower than the power supply voltage VDD. Therefore, the time for detection by the charger reverse connection detection circuit 116 is shortened accordingly, and the detection speed by the charger reverse connection detection circuit 116 is increased. Therefore, since the discharge stops immediately, the safety for the battery 200 is increased.

なお、ＭＯＳ１２０及びＭＯＳ１３０は、端子ＥＢ−及びバッテリ２００の負極端子の間に設けられるＮＭＯＳであるが、端子ＥＢ＋及びバッテリ２００の正極端子の間に設けられるＰＭＯＳであっても良い。   The MOS 120 and the MOS 130 are NMOSs provided between the terminal EB− and the negative terminal of the battery 200, but may be PMOSs provided between the terminal EB + and the positive terminal of the battery 200.

また、充放電制御回路１１０は１個の半導体装置として構成され、ＭＯＳ１２０及びＭＯＳ１３０はＭＯＳＦＥＴとしてその半導体装置外部に設けられても良いしＭＯＳとしてその半導体装置内部に設けられても良い。   The charge / discharge control circuit 110 is configured as a single semiconductor device, and the MOS 120 and the MOS 130 may be provided as MOSFETs outside the semiconductor device, or may be provided as MOS inside the semiconductor device.

バッテリパックを示すブロック図である。It is a block diagram which shows a battery pack. 充放電制御回路を示すブロック図である。It is a block diagram which shows a charging / discharging control circuit. 第一実施形態の充電器逆接続検出回路を示す図である。It is a figure which shows the charger reverse connection detection circuit of 1st embodiment. 第二実施形態の充電器逆接続検出回路を示す図である。It is a figure which shows the charger reverse connection detection circuit of 2nd embodiment.

符号の説明Explanation of symbols

１００……保護回路 １１０……充放電制御回路 １２０……ＭＯＳ １３０……ＭＯＳ ２００……バッテリ 100 …… Protection circuit 110 …… Charge / discharge control circuit 120 …… MOS 130 …… MOS 200 …… Battery

Claims (3)

充放電経路に第一ＭＯＳ及び第二ＭＯＳが設けられるバッテリの充放電を制御する充放電制御回路において、
前記バッテリに充電器が極性を逆に接続されることを検出するための検出端子と、
前記検出端子の電圧が電源電圧よりも低い所定電圧になると、オンすると電流を流してオフすると寄生ダイオードによる放電電流だけを流す前記第一ＭＯＳがオンするよう動作し、オンすると電流を流してオフすると寄生ダイオードによる充電電流だけを流す前記第二ＭＯＳがオフするよう動作し、前記バッテリの放電を停止させる充電器逆接続検出回路と、
を備えることを特徴とする充放電制御回路。 In a charge / discharge control circuit for controlling charge / discharge of a battery in which a first MOS and a second MOS are provided in a charge / discharge path,
A detection terminal for detecting that a charger is connected to the battery in reverse polarity;
When the voltage at the detection terminal becomes a predetermined voltage lower than the power supply voltage, when it is turned on, the first MOS that flows only the discharge current due to the parasitic diode is turned on when it is turned off. Then, the second MOS that flows only the charging current due to the parasitic diode operates to turn off, and a charger reverse connection detection circuit that stops discharging of the battery,
A charge / discharge control circuit comprising: 前記充電器逆接続検出回路は、
入力端子が前記検出端子に設けられ、反転電圧が前記所定電圧であるインバータ、
を有することを特徴とする請求項１記載の充放電制御回路。 The charger reverse connection detection circuit,
An inverter having an input terminal provided on the detection terminal and an inversion voltage being the predetermined voltage;
The charge / discharge control circuit according to claim 1, comprising: 前記充電器逆接続検出回路は、
入力端子が検出端子に設けられ、出力端子がコンパレータの第二入力端子に設けられる分圧回路と、
出力端子が前記コンパレータの第一入力端子に設けられる基準電圧回路と、
前記検出端子の電圧が前記所定電圧以上になると、出力電圧を反転する前記コンパレータと、
を有することを特徴とする請求項１記載の充放電制御回路。 The charger reverse connection detection circuit,
A voltage dividing circuit in which an input terminal is provided in the detection terminal and an output terminal is provided in the second input terminal of the comparator;
A reference voltage circuit having an output terminal provided at the first input terminal of the comparator;
The comparator for inverting the output voltage when the voltage at the detection terminal is equal to or higher than the predetermined voltage;
The charge / discharge control circuit according to claim 1, comprising:
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JP2006210026A (en) * 2005-01-26 2006-08-10 Hitachi Ulsi Systems Co Ltd Semiconductor device for monitoring lithium ion secondary battery

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011091901A (en) * 2009-10-20 2011-05-06 Seiko Instruments Inc Battery state monitoring circuit and battery device
US9142983B2 (en) 2011-07-26 2015-09-22 Seiko Instruments Inc. Battery protection IC and battery device
KR20150127853A (en) 2011-07-26 2015-11-18 세이코 인스트루 가부시키가이샤 Battery protection ic and battery device
WO2018079276A1 (en) * 2016-10-28 2018-05-03 三洋電機株式会社 Power supply device
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JPWO2018079276A1 (en) * 2016-10-28 2019-09-12 三洋電機株式会社 Power supply
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JP7080822B2 (en) 2016-10-28 2022-06-06 三洋電機株式会社 Power supply
CN109891700B (en) * 2016-10-28 2022-11-22 三洋电机株式会社 Power supply device
CN114237079A (en) * 2021-09-30 2022-03-25 宁波三星智能电气有限公司 Circuit capable of utilizing serial port to turn off power supply
CN114237079B (en) * 2021-09-30 2024-04-30 宁波三星智能电气有限公司 Circuit capable of utilizing serial port to turn off power supply

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