Portable device and method for controlling charging current thereof
AssigneeHTC Corporation
InventorShih-Ping Lin
Life of this patent
Estimating the term…
Abstract
A portable device is provided. The portable device includes a battery unit, a charger circuit, a detecting unit and a processing unit. The charger circuit provides a charging current to charge the battery unit according to an input power and adjusts the charging current to a charging value according to a first control signal. The detecting unit detects and obtains an instantaneous operating current, an instantaneous charging current and a system temperature in the portable device. The processing unit provides the first control signal according to the instantaneous operating current, the instantaneous charging current and the system temperature.
Claims18
A portable device, comprising:
- a battery unit;
- a charger circuit configured to provide a charging current to charge the battery unit according to an input power and to adjust the charging current to a charging value according to a first control signal;
- a detecting unit configured to detect and obtain an operating current consumed by the portable device, the charging current provided to the battery unit, and a system temperature in the portable device;
- and
- a processing unit configured to provide the first control signal according to the operating current, the charging current and the system temperature when the system temperature is between a first temperature value and a second temperature value higher than the first temperature value, so as to adjust the charging current to the charging value in exponential proportion with a first control parameter,
- wherein the first control parameter is obtained by dividing a first temperature difference by a second temperature difference, and the first temperature difference represents a difference between the second temperature value and the system temperature, and the second temperature difference represents a difference between the second temperature value and the first temperature value, and
- wherein the first temperature value is a threshold temperature for the processor to determine whether to adjust the charging current to a maximum charging current value, and the second temperature value is an allowable maximum temperature for the processor to determine whether to adjust the charging current to a minimum charging current value.
A method for controlling a charging current of a portable device having a battery unit, comprising:
- providing a charging current according to an input power to charge the battery unit;
- detecting and obtaining an operating current consumed by the portable device, the charging current provided to the battery unit, and a system temperature in the portable device;
- providing a first control signal according to the operating current, the charging current and the system temperature when the system temperature is between a first temperature value and a second temperature value higher than the first temperature value;
- and
- adjusting the charging current according to the first control signal and a first control parameter, wherein the charging current is adjusted to a charging value in exponential proportion with the first control parameter,
- wherein the first control parameter is obtained by dividing a first temperature difference by a second temperature difference, and the first temperature difference represents a difference between the second temperature value and the system temperature, and the second temperature difference represents a difference between the second temperature value and the first temperature value, and
- wherein the first temperature value is a threshold temperature for the processor to determine whether to adjust the charging current to a maximum charging current value, and the second temperature value is an allowable maximum temperature for the processor to determine whether to adjust the charging current to a minimum charging current value.
Dependencies are inferred from the claim text.