Battery charger with temperature control
First Claim
1. A battery charger integrated circuit with temperature control, comprising:
- 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, a logic output signal is generated 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) to be linearly proportional to said reference current and to said second reference voltage (VREF).
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Accused Products
Abstract
A battery charger integrated circuit with temperature control is disclosed that includes a temperature sensor circuit and a charging current generator circuit. Upon receiving a temperature reading voltage (VDT), the temperature sensing circuit is operable to generate a second reference voltage (VREF) that is a function of the first reference voltage (VREF1). The charging current generator circuit generates and continuously adjusts a reference current (I1) and a charging current (IOUT) according to the second reference voltage (VREF). Whenever the temperature reading voltage (VDT) exceeds the first reference voltage, the temperature sensor circuit is operable to adjust the second reference voltage (VREF).
37 Citations
18 Claims
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1. 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, a logic output signal is generated 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) to be linearly proportional to said reference current and to said second reference voltage (VREF). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. 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; comparing said temperature reading voltage (VDT) to a first reference voltage (VREF1) to generate a logic output signal; providing a second reference voltage (VREF) related to said first reference voltage (VREF1) and said logic output signal, whenever said temperature reading voltage (VDT) surpasses said first reference voltage (VREF1), adjusting said second reference voltage (VREF) to generate and decrease a reference current (I1) and a charging current (I) to be linearly proportional to said reference current (I1) and to said second reference voltage (VREF). - View Dependent Claims (14, 15, 16)
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17. A battery charger integrated circuit with temperature control, comprising:
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means for comparing a temperature reading voltage (VDT) to a first reference voltage (VREF1), whenever said temperature reading voltage surpasses said first reference voltage, said comparing means generates a logic output signal; means for generating a second reference voltage, coupled to receive said logic output signal to continuously adjusting said second reference voltage (VREF) so as to adjust said charging current (I) that is proportional to said temperature measurement; and
analogmeans for adjusting a charging current, electrically coupled to said second reference voltage means, operating to generate and adjust a reference current (I1) and said charging current (I) that is linearly proportional to said reference current and said second reference voltage (VREF) so as to maintain said temperature reading voltage below said first reference voltage (VREF1). - View Dependent Claims (18)
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Specification