Charging control circuit, charger, power supply circuit, information processing device, and battery pack
First Claim
1. A charging control circuit of a charging circuit capable of supplying a charging current to a rechargeable battery received in a battery pack, said charging control circuit comprising:
- a charging current detecting part that detects information on a charging current based on a potential difference generated by the charging current across opposite ends of a resistor arranged in said battery pack; and
a control part that controls the charging current based on said information on the charging current.
1 Assignment
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Accused Products
Abstract
A power supply circuit, a charger, a charging control circuit, an information processing device and a battery pack are provided which is capable of decreasing electric current detection resistors at a charger side thereby to achieve improvements in the charging efficiency of a power supply circuit or the like as well as reduction in cost and size. A charging current flows in a current sensing resistor RS arranged in a battery pack 4A upon charging thereof. A charging control circuit 8A detects the charging current by detecting a voltage across opposite ends of the current sensing resistor RS, and controls the charging current by using the detection value thereof in such a manner that the charging current is in a prescribed range. As a result, the number of current detection resistors, which are employed in one closed circuit formed in a power supply circuit 1A upon charging, can be made one.
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Citations
22 Claims
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1. A charging control circuit of a charging circuit capable of supplying a charging current to a rechargeable battery received in a battery pack,
said charging control circuit comprising: -
a charging current detecting part that detects information on a charging current based on a potential difference generated by the charging current across opposite ends of a resistor arranged in said battery pack; and
a control part that controls the charging current based on said information on the charging current. - View Dependent Claims (2, 3, 4, 5)
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6. A charging circuit capable of supplying a charging current to a rechargeable battery received in a battery pack,
said charging circuit comprising: -
a charging current supply part connected with a charging current supply line for supplying a charging current to said charging current supply line; and
a charging control circuit that controls the charging current supplied by said charging current supply part based on a potential difference generated by the charging current across opposite ends of a resistor arranged in said battery pack. - View Dependent Claims (7, 8, 9)
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10. A charger adapted to be connected with a rechargeable battery received in a battery pack for charging said battery,
said charger comprising: -
a first connection terminal adapted to be connected with a positive terminal side of said battery for supplying a charging current to said battery;
a second connection terminal adapted to be connected with a negative terminal side of said battery for supplying a charging current to said battery;
a third connection terminal adapted to be connected with a prescribed external connection terminal of said battery pack, said third connection terminal being given a prescribed potential based on an electric current flowing through said battery; and
a charging circuit connected with said third connection terminal and at least one of said first connection terminal and said second connection terminal for controlling the charging current supplied to said battery by detecting a potential difference based on an electric current flowing through said battery. - View Dependent Claims (11, 12, 13, 14)
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15. A power supply circuit comprising:
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a rechargeable battery;
a resistor connected in series with said battery;
a protection circuit that monitors a power supply electric current supplied from said battery based on a potential difference across opposite ends of said resistor; and
a charger that applies a charging voltage to said battery thereby to supply a charging current thereto, said charger being operable to control the charging current supplied to said battery based on at least the potential difference across the opposite ends of said resistor. - View Dependent Claims (16, 17, 18)
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19. An information processing device including a CPU installed thereon and a charger for charging a rechargeable battery, wherein
said charger can introduce a potential difference which is generated across a resistor connected in series with the battery, due to a charging current through said resistor and which can be used to monitor the power supply electric current supplied from said battery, based on the potential difference across opposite ends of said resistor; - and
said charging current supplied to said battery is controlled based on the potential difference across the opposite ends of said resistor. - View Dependent Claims (20)
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21. A battery pack having a rechargeable battery received therein,
said battery pack comprising: -
a rechargeable battery;
a first external connection terminal connected with a positive terminal side of said battery for receiving a charging current supplied thereto from outside as well as supplying electric power to external equipment;
a second external connection terminal connected with a negative terminal side of said battery for receiving the charging current supplied thereto from outside as well as supplying electric power to external equipment;
a resistor connected in series with said battery between said first external connection terminal and said second external connection terminal;
a protection circuit that monitors an overcurrent state by detecting a potential difference across opposite ends of said resistor; and
a third external connection terminal that supplies information on the potential difference across the opposite ends of said resistor to outside. - View Dependent Claims (22)
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Specification