Battery charger and charge control circuit
AssigneeKabushiki Kaisha Toyoda Jidoshokki Seisakusho
InventorTakashi Aoyama
Life of this patent
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Abstract
A switch is controlled by a charging control unit. An inductor is provided between the switch and a secondary battery. An offset generation unit generates voltage V2 by adding an offset voltage Vos to voltage V1, where the voltage V1 corresponds to an inductor current. A current detection unit detects the inductor current based on the voltage V2. A voltage detection unit detects output voltage Vout. A charging control unit controls the switch based on the inductor current detected by the current detection unit and the output voltage Vout detected by the voltage detection unit.
Claims8
A charging control circuit for controlling an operation of a battery charger including a switch to which DC voltage is applied and an inductor connected to the switch, comprising:
- offset means for adding an offset to a signal corresponding to an inductor current;
- conversion means for generating a current corresponding to the signal to which the offset is added;
- correction means for eliminating an effect due to the offset from the current generated by said conversion means;
- and
- control means for controlling the switch based on the current corrected by said correction means.
A charging control circuit for controlling an operation of a battery charger including a switch to which DC voltage is applied and an inductor connected to the switch, comprising:
- an offset circuit adding an offset to a signal corresponding to an inductor current;
- a conversion circuit generating a current corresponding to the signal to which the offset is added;
- a correction circuit eliminating an effect due to the offset from the current generated by said conversion circuit;
- and
- a controller controlling the switch based on the current corrected by said correction circuit.
A charging control circuit for controlling an operation of a battery charger including a switch to which DC voltage is applied and an inductor connected to the switch, comprising:
- a resistor which is connected to the inductor in series;
- an amplifier which comprises a first input terminal and a second input terminal, the first input terminal being connected to one end of said resistor and the second input terminal being connected to the other end of said resistor;
- an offset circuit applying an offset voltage to the first input terminal of said amplifier;
- a feedback circuit generating a feedback signal based on an output of said amplifier in such a way that a potential of the first input terminal of said amplifier and a potential of the second input terminal of said amplifier become the same, and supplying the feedback signal to the second input terminal of said amplifier;
- and
- a controller controlling the switch based on the output of said feedback circuit.
A battery charger including a switch to which DC voltage is applied and an inductor connected to the switch, comprising:
- offset means for adding an offset to a signal corresponding to an inductor current;
- conversion means for generating a current corresponding to the signal to which the offset is added;
- correction means for eliminating an effect due to the offset from the current generated by said conversion means;
- and
- control means for controlling the switch based on the current corrected by said correction means.
A charging control method for controlling an operation of a battery charger including a switch to which DC voltage is applied and an inductor connected to the switch, comprising:
- adding an offset to a signal corresponding to an inductor current;
- generating a current corresponding to the signal to which the offset is added;
- eliminating the effect due to the offset from the generated current;
- and
- controlling the switch based on the current from which the effect due to the offset has been eliminated.
Dependencies are inferred from the claim text.