Battery charger with temperature control
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Accused Products
Abstract
A battery charging circuit monitors the IC temperature through monitoring the charging die temperature, or directly monitoring the IC temperature using a temperature sensor. A maximum temperature allowed for the charging die is predetermined. The charging circuit is capable of reducing charging current at the predetermined maximum temperature value. The charging die signal is compared by a reference signal to achieve the reduction of charging current at the maximum allowed temperature value.
33 Citations
41 Claims
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1-20. -20. (canceled)
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21. A battery charger integrated circuit with temperature control, comprising:
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a temperature sensor circuit, electrically coupled to receive a first reference voltage (VREF1) and a temperature reading voltage (VDT), operable to generate a second reference voltage (VREF) that is related to said first reference voltage (VREF1), wherein whenever said temperature reading voltage (VDT) surpasses said first reference voltage, said temperature sensor circuit is operable to adjust said second reference voltage (VREF); and a charging current generator circuit, electrically coupled to receive said second reference voltage (VREF), operable to generate and continuously adjust a reference current (I1) and a charging current (I) according to said second reference voltage (VREF). - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method of providing temperature control in a battery charger integrated circuit, comprising:
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providing a temperature reading voltage (VDT) representative of a temperature measurement of said battery charger integrated circuit; providing a second reference voltage (VREF) related to said first reference voltage (VREF); and comparing said temperature reading voltage (VDT) to a first reference voltage (VREF1), whenever said temperature reading voltage (VDT) surpasses said first reference voltage (VREF1), adjusting said second reference voltage (VREF) so as to adjust a charging current that is proportional to said temperature measurement. - View Dependent Claims (34, 35, 36, 37)
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38. A battery charger integrated circuit with temperature control, comprising:
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means for generating a second reference voltage upon receiving a temperature reading voltage and a first reference voltage; and means for adjusting a charging current based on said second reference voltage which is based on said first reference voltage so as to maintain said temperature reading voltage below said first reference voltage. - View Dependent Claims (39, 40, 41)
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Specification