CHARGING CIRCUIT
First Claim
1. A charging circuit configured to receive electric power from a solar battery, and to charge a secondary battery, the charging circuit comprising:
- a DC/DC converter comprising a switching transistor, an inductor element, a rectifier element, and an output capacitor;
a charging current detection unit configured to generate a detection signal that corresponds to a charging current supplied from the DC/DC converter to the secondary battery;
a control circuit configured to generate a reference voltage that corresponds to the detection signal; and
a driving unit configured to generate a pulse signal having a duty ratio that is adjusted such that the voltage output from the solar battery matches the reference voltage, and to perform switching of the switching transistor according to the pulse signal.
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Accused Products
Abstract
A charging circuit receives electric power from a solar battery, and charges a secondary battery. A charging current detection unit generates a detection signal that corresponds to a charging current supplied from a DC/DC converter to the secondary battery. A control circuit generates a reference voltage that corresponds to the detection signal. A driving unit generates a pulse signal having a duty ratio that is adjusted such that the voltage output from the solar battery matches the reference voltage, and performs switching of a switching transistor according to the pulse signal. A control circuit adjusts the reference voltage such that the reference voltage becomes greater.
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Citations
20 Claims
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1. A charging circuit configured to receive electric power from a solar battery, and to charge a secondary battery, the charging circuit comprising:
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a DC/DC converter comprising a switching transistor, an inductor element, a rectifier element, and an output capacitor; a charging current detection unit configured to generate a detection signal that corresponds to a charging current supplied from the DC/DC converter to the secondary battery; a control circuit configured to generate a reference voltage that corresponds to the detection signal; and a driving unit configured to generate a pulse signal having a duty ratio that is adjusted such that the voltage output from the solar battery matches the reference voltage, and to perform switching of the switching transistor according to the pulse signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An electronic device comprising:
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a solar battery; a secondary battery; and a charging circuit configured to receive a voltage output from the solar battery, and to charge the secondary battery, wherein the charging circuit comprises; a DC/DC converter comprising a switching transistor, an inductor element, a rectifier element, and an output capacitor; a charging current detection unit configured to generate a detection signal that corresponds to a charging current supplied from the DC/DC converter to the secondary battery; a control circuit configured to generate a reference voltage that corresponds to the detection signal; and a driving unit configured to generate a pulse signal having a duty ratio that is adjusted such that the voltage output from the solar battery matches the reference voltage, and to perform switching of the switching transistor according to the pulse signal.
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Specification