CHARGING A BATTERY IN A PORTABLE ELECTRONIC DEVICE
First Claim
1. A method for charging a battery in a portable electronic device, wherein the battery is charged using a constant-current, constant-voltage charging process, the method comprising:
- receiving a resistance for a current loop that includes a charger and the battery;
during a constant-current charging phase, outputting a constant current from the charger until an output voltage of the charger reaches a target voltage, wherein the target voltage includes a battery target voltage and a compensation voltage, wherein the compensation voltage is based on the received resistance and a charging current;
switching from the constant-current charging phase to a constant-voltage charging phase when the output voltage reaches the target voltage; and
during the constant-voltage charging phase, outputting the target voltage, which includes the battery target voltage and the compensation voltage, from the charger until the charging current drops below a minimum value at which time the charging process is complete.
1 Assignment
0 Petitions
Accused Products
Abstract
A system and method are described for charging a battery in a portable electronic device wherein the battery is charged using a constant-current, constant-voltage charging process. In described embodiments, a resistance is received for a current loop that includes a charger and the battery. Then, during a constant-current charging phase, a constant current is output from the charger until an output voltage of the charger reaches a target voltage. The target voltage includes a battery target voltage and a compensation voltage based on the received resistance and a charging current. When the output voltage of the charger reaches the target voltage, the charger switches from the constant-current phase to a constant-voltage phase. Then during the constant-voltage phase, the charger outputs the target voltage until the charging current drops below a minimum value at which time the charging process is complete.
26 Citations
20 Claims
-
1. A method for charging a battery in a portable electronic device, wherein the battery is charged using a constant-current, constant-voltage charging process, the method comprising:
-
receiving a resistance for a current loop that includes a charger and the battery; during a constant-current charging phase, outputting a constant current from the charger until an output voltage of the charger reaches a target voltage, wherein the target voltage includes a battery target voltage and a compensation voltage, wherein the compensation voltage is based on the received resistance and a charging current; switching from the constant-current charging phase to a constant-voltage charging phase when the output voltage reaches the target voltage; and during the constant-voltage charging phase, outputting the target voltage, which includes the battery target voltage and the compensation voltage, from the charger until the charging current drops below a minimum value at which time the charging process is complete. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A system for charging a battery in an electronic device, comprising:
-
a battery; a current regulator coupled to the battery; a voltage regulator coupled to the battery, wherein a voltage set-point circuit of the voltage regulator includes a compensation resistor; and a current monitor coupled to a current loop through the voltage regulator and the battery and configured to monitor a charging current entering the battery, wherein feedback from the current monitor is coupled to the compensation resistor. - View Dependent Claims (10, 11, 12, 13)
-
-
14. A method for charging a battery in a portable electronic device, wherein the battery is charged using a constant-current charging, constant-voltage charging process, the method comprising:
-
during a constant-current charging phase, outputting a constant current from the charger with a target voltage determined based on a battery target voltage and a compensation voltage; when a voltage from the charger during the constant current phase reaches the target voltage, switching to a constant-voltage charging phase; and during the constant-voltage charging phase, using a feedback loop to control a voltage of a charging current output from the charger to a set-point based on a voltage across the battery. - View Dependent Claims (15, 16, 17, 18, 19, 20)
-
Specification