Battery charger with temperature control
First Claim
1. A battery charger integrated circuit comprising:
- a temperature sensor circuit, electrically coupled to receive a first reference signal and a temperature signal, operable to generate a second reference signal, wherein when the temperature signal is greater than the first reference signal, an adjust signal is generated to adjust the second reference signal; and
a charging current generator circuit, electrically coupled to receive the second reference signal, operable to generate a charging current based on the second reference signal, wherein the charging current is reduced when the temperature signal is greater than the first reference signal such that a charging die is prevented from exceeding a predetermined temperature.
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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).
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Citations
14 Claims
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1. A battery charger integrated circuit comprising:
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a temperature sensor circuit, electrically coupled to receive a first reference signal and a temperature signal, operable to generate a second reference signal, wherein when the temperature signal is greater than the first reference signal, an adjust signal is generated to adjust the second reference signal; and a charging current generator circuit, electrically coupled to receive the second reference signal, operable to generate a charging current based on the second reference signal, wherein the charging current is reduced when the temperature signal is greater than the first reference signal such that a charging die is prevented from exceeding a predetermined temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of providing temperature control in a battery charger integrated circuit, comprising:
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receiving a temperature signal indicating a temperature measurement of the battery charger integrated circuit; comparing the temperature signal with a first reference signal to generate an adjust signal when the temperature signal is greater than the first reference signal; generating a second reference signal related to the adjust signal; and generating a charging current based on the second reference signal, wherein the charging current is reduced when the temperature signal is greater than the first reference signal such that a charging die is prevented from exceeding a predetermined temperature. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification