INTEGRATED CIRCUIT FOR CONTROLLING CHARGING, CHARGING DEVICE USING THE INTEGRATED CIRCUIT, AND METHOD FOR DETECTING CONNECTION OF SECONDARY BATTERY
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Abstract
An integrated circuit for charging a secondary battery including a charge current detection circuit detecting a charge current output from a charging transistor, and generating a signal including the charge current information; a voltage comparison circuit comparing a voltage of the battery with one or more predetermined voltages, and generating a signal including the voltage comparison information; and a charge controlling circuit controlling the charging transistor according to information on the voltage of the battery and the signals output from the charge current detection circuit and the voltage comparison circuit such that the charging transistor performs constant current charging or constant voltage charging, wherein the charge controlling circuit stops applying a charge current for a predetermined time in the beginning of charging, and judges that the battery is abnormally connected when the voltage of the battery becomes less than a predetermined voltage within the predetermined time.
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Citations
36 Claims
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1-11. -11. (canceled)
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12. An integrated circuit for charging a secondary battery via a charging transistor, comprising:
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a charge current detection circuit which detects a charge current output from the charging transistor, and generates and outputs a signal including the charge current information; a voltage comparison circuit which compares a voltage of the secondary battery with one or more predetermined voltages, and generates and outputs a signal including the voltage comparison information; and a charge controlling circuit which controls the charging transistor according to information on the voltage of the secondary battery and the signals output from the charge current detection circuit and the voltage comparison circuit such that the charging transistor performs constant current charging in which a predetermined current is output or constant voltage charging in which a charge current is output so that the secondary battery has a predetermined voltage, wherein, when the voltage comparison circuit detects that the voltage of the secondary battery becomes not less than a predetermined voltage V2, the charge controlling circuit stops applying a charge current for a predetermined time T2, and wherein, when the voltage comparison circuit detects that the voltage of the secondary battery becomes less than a predetermined voltage V2−
less than the voltage V2 within the predetermined time T2, the charge controlling circuit judges that the secondary battery is abnormally connected and performs an abnormality correction treatment. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 25)
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20. An integrated circuit for charging a secondary battery via a charging transistor, comprising:
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a charge current detection circuit which detects a charge current output from the charging transistor, and generates and outputs a signal including the charge current information; a voltage comparison circuit which compares a voltage of the secondary battery with one or more predetermined voltages, and generates and outputs a signal including the voltage comparison information; and a charge controlling circuit which controls the charging transistor according to information on the voltage of the secondary battery and the signals output from the charge current detection circuit and the voltage comparison circuit such that the charging transistor performs constant current charging in which a predetermined current is output or constant voltage charging in which a charge current is output so that the secondary battery has a predetermined voltage, wherein, when the charge current detection circuit detects that the charge current applied to the secondary battery becomes less than a predetermined current i2, and further detects that the charge current becomes less than a predetermined current i1 less than the current i2 within a predetermined time T4, the charge controlling circuit judges that the secondary battery is abnormally connected and performs an abnormality correction treatment. - View Dependent Claims (21, 22, 23, 26)
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24. (canceled)
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27. A method for detecting connection of a secondary battery comprising:
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applying a charge current to a secondary battery through a charging transistor; stopping applying a charge current for a predetermined time T1 in beginning of the charging operation while checking the voltage of the secondary battery within the time T1; and performing an abnormality correction treatment when the voltage of the secondary battery is less than a predetermined voltage V1 within the time T1. - View Dependent Claims (28, 29, 30)
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31. A method for detecting connection of a secondary battery comprising:
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applying a charge current to a secondary battery through a charging transistor; checking the voltage of the secondary battery; stopping applying a charge current for a predetermined time T2 when the voltage of the secondary battery becomes not less than a predetermined voltage V2; and performing an abnormality correction treatment when the voltage of the secondary battery becomes less than a predetermined voltage V2−
less than the voltage V2 within the time T2. - View Dependent Claims (32, 33, 34)
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35. A method for detecting connection of a secondary battery comprising:
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applying a charge current to a secondary battery through a charging transistor; checking the current of the secondary battery for a predetermined time T4 when the current becomes less than a predetermined current i2; and performing an abnormality correction treatment when the current is less than a predetermined current i1 less than the current i2 within the predetermined time T4. - View Dependent Claims (36)
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Specification