Integrated circuit for controlling charging, charging device using the integrated circuit, and method for detecting connection of secondary battery

An integrated circuit for charging a secondary battery via a charging transistor, comprising:

• 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 the charge controlling circuit stops applying a charge current for a predetermined time T1 in beginning of charging of the secondary battery,
• wherein, when the voltage comparison circuit detects that the voltage of the secondary battery becomes less than a predetermined voltage V1 within the predetermined time T1, the charge controlling circuit judges that the secondary battery is abnormally connected and performs an abnormality correction treatment, and
• 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.

An integrated circuit for charging a secondary battery via a charging transistor, comprising:

• 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 the charge controlling circuit stops applying a charge current for a predetermined time T1 in beginning of charging of the secondary battery,
• wherein, when the voltage comparison circuit detects that the voltage of the secondary battery becomes less than a predetermined voltage V1 within the predetermined time T1, the charge controlling circuit judges that the secondary battery is abnormally connected and performs an abnormality correction treatment, and
• wherein the voltage comparison circuit includes a comparator which compares the voltage of the secondary battery with the voltage V1, and generates and outputs a signal S1 including the comparison information to the charge controlling circuit.

An integrated circuit for charging a secondary battery via a charging transistor, comprising:

• 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;
• 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;
• an input terminal which is connected with the secondary battery and to which the voltage of the secondary battery is input;
• and
• a current source which applies a current while being controlled according to the control signals input from the charge controlling circuit,
• wherein the charge controlling circuit stops applying a charge current for a predetermined time T1 in beginning of charging of the secondary battery,
• wherein, when the voltage comparison circuit detects that the voltage of the secondary battery becomes less than a predetermined voltage V1 within the predetermined time T1, the charge controlling circuit judges that the secondary battery is abnormally connected and performs an abnormality correction treatment, and
• wherein the charge controlling circuit controls drive of the current source according to an external control signal for controlling a consumption current of a load to which a power is applied from the secondary battery.

An integrated circuit for charging a secondary battery via a charging transistor, comprising:

• 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 the charge controlling circuit stops applying a charge current for a predetermined time T1 in beginning of charging of the secondary battery,
• wherein, when the voltage comparison circuit detects that the voltage of the secondary battery becomes less than a predetermined voltage V1 within the predetermined time T1, the charge controlling circuit judges that the secondary battery is abnormally connected and performs an abnormality correction treatment, and
• wherein, when the charge controlling circuit judges that the secondary battery is abnormally connected, the charge controlling circuit stops applying a charge current to the secondary battery.

A charging device for performing constant current charging or constant voltage charging on a secondary battery comprising:

• a DC power source configured to apply a DC power to a charging transistor;
• the charging transistor configured to apply a charge current to the secondary battery;
• and
• a charge controlling integrated circuit for controlling the charging transistor according to information on the charge current applied to the secondary battery and the voltage of the secondary battery,
• wherein the charge controlling integrated circuit comprises:
• an integrated circuit for charging a secondary battery via a charging transistor, comprising:
• 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 the charge controlling circuit stops applying a charge current for a predetermined time T1 in beginning of charging of the secondary battery,
• wherein, when the voltage comparison circuit detects that the voltage of the secondary battery becomes less than a predetermined voltage V1 within the predetermined time T1, the charge controlling circuit judges that the secondary battery is abnormally connected and performs an abnormality correction treatment, and
• wherein, when the charge controlling circuit judges that the secondary battery is abnormally connected, the charge controlling circuit stops applying a charge current to the secondary battery.