Electronic device and method for calibrating RSOC of a battery
AssigneeQuanta Computer Inc.
InventorWei-Ting Yen
Life of this patent
Estimating the term…
Abstract
An electronic device includes a battery device, a capacity measuring unit, and a microprocessor. The battery device outputs its remaining capacity and fully charged capacity. The capacity measuring unit includes a sensing resistor, measures the battery current of the battery device using the sensing resistor, and integrates the battery current to obtain the actual capacity. The microprocessor stores the fully charged capacity. When the battery device is in a specific state, the microprocessor calculates the capacity difference between the remaining capacity and the actual capacity. The microprocessor calibrates the fully charged capacity according to the ratio of the capacity difference to the remaining capacity.
Claims7
An electronic device, comprising:
- a battery device, comprising a gas-gauge, wherein the gas-gauge is configured to detect and output a remaining capacity and a fully charged capacity;
- a capacity measuring unit, comprising a sensing resistor;
- wherein the capacity measuring unit is configured to measure a battery current of the battery device using the sensing resistor, and to integrate the battery current over time to obtain an actual capacity;
- a microprocessor, configured to store the fully charged capacity, to calculate a capacity difference between the remaining capacity and the actual capacity when the battery device is in a specific state, and to calibrate the fully charged capacity according to a ratio of the capacity difference to the remaining capacity;
- wherein the battery device further outputs a relative state-of-charge (RSOC);
- the microprocessor further calculates an actual RSOC;
- and the actual RSOC is equal to the quotient obtained by dividing the actual capacity by the fully charged capacity;
- wherein when the ratio of the capacity difference to the remaining capacity is higher than a predetermined value, the microprocessor is configured to calibrate the stored fully charged capacity of the battery device, so that the actual RSOC calculated by the microprocessor is equal to the RSOC of the battery device.
A method for calibrating the relative state-of-charge (RSOC) of a battery, suitable for an electronic device having a battery device, a capacity measuring unit, and a microprocessor, comprising:
- detecting that the battery device is in a specific state;
- reading a remaining capacity and a fully charged capacity of the battery device, and storing the fully charged capacity, wherein the remaining capacity and the fully charged capacity is detected by a gas-gauge of the battery device;
- measuring a battery current of the battery device by the capacity measuring unit, and integrating the battery current over time to obtain an actual capacity;
- calculating a capacity difference between the remaining capacity and the actual capacity;
- and
- calibrating the fully charged capacity according to the ratio of the capacity difference to the remaining capacity;
- receiving the relative state-of-charge (RSOC) of the battery device;
- calculating the actual RSOC;
- wherein the actual RSOC is equal to the quotient obtained by dividing the actual capacity by the fully charged capacity;
- and
- calibrating the stored fully charged capacity of the battery device when the ratio of the capacity difference to the remaining capacity is higher than a predetermined value, so that the actual RSOC calculated by the microprocessor is equal to the RSOC of the battery device.
Dependencies are inferred from the claim text.