Charger and integrated circuit having first and second charging currents
First Claim
1. A charger, comprising:
- a charging transistor series-connected with a secondary battery and supplying a first charging current from a first power source to the secondary battery; and
a charging integrated circuit controlling the charging transistor,wherein the charging integrated circuit includes a current source supplying a second charging current to the secondary battery, andthe current source supplies the second charging current together with the first charging current to the secondary battery, wherein said current source supplying said second charging current comprises a second charging transistor that is series-connected between said secondary battery and a voltage terminal of said charging integrated circuit.
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Accused Products
Abstract
A charger of the present invention includes a charging transistor and a charging integrated circuit. The charging transistor is series-connected with a secondary battery to supply a charging current to the secondary battery. The charging integrated circuit is incorporated into a package having a higher heat releasability than that of the charging transistor. The charging integrated circuit controls the charging transistor and besides, supplies a charging current to the secondary battery. For this purpose, the charging integrated circuit includes a current source supplying this charging current. The charging current from the current source is supplied to the secondary battery together with the charging current from the charging transistor to charge the secondary battery.
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Citations
17 Claims
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1. A charger, comprising:
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a charging transistor series-connected with a secondary battery and supplying a first charging current from a first power source to the secondary battery; and a charging integrated circuit controlling the charging transistor, wherein the charging integrated circuit includes a current source supplying a second charging current to the secondary battery, and the current source supplies the second charging current together with the first charging current to the secondary battery, wherein said current source supplying said second charging current comprises a second charging transistor that is series-connected between said secondary battery and a voltage terminal of said charging integrated circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A charger, comprising:
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a first charging current source supplying a first charging current to a secondary battery; a second charging current source supplying a second charging current together with the first charging current to the secondary battery; and a charging control circuit controlling the first charging current source and the second charging current source, wherein the second charging current source and the charging control circuit are incorporated into one package, wherein said second charging current source comprises a transistor controlled as a current mirror. - View Dependent Claims (13)
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14. An integrated circuit controlling a charging transistor series-connected with a secondary battery and supplying a first charging current to the secondary battery, comprising:
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a control circuit controlling the charging transistor; and a charging current source supplying a second charging current to the secondary battery, wherein the second charging current is supplied together with the first charging current to the secondary battery, wherein said charging current source comprises a transistor controlled as a current mirror. - View Dependent Claims (15, 16, 17)
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Specification