Electronic apparatus and charging method thereof

1. An electronic apparatus, comprising:

batteries;

a charger configured to charge the batteries;

a switch network electrically connected to the batteries; and

a charging controller configured to control the switch network to change a connection relationship between the batteries and control the charger to charge the batteries while the batteries are in the changed connection relationship,

wherein the charging controller is further configured to:

calculate a required charging current value based on either one or both of an output voltage value of a power supplier and a usage pattern of a user,

determine a charging mode to be a high-voltage charging mode in response to the calculated required charging current value being greater than or equal to a threshold current

control, in the high-voltage charging mode, the switch network such that the batteries are in series connection relationship,

determine the charging mode to be a low-voltage charging mode in response to the calculated required charging current value being less than the threshold current, and

control, in the low-voltage charging mode, the switch network such that the batteries are in parallel connection relationship.

2. The electronic apparatus of claim 1 , wherein, in the high-voltage charging mode, the charger is further configured to charge the batteries, while the batteries are in the series connection relationship, with a voltage set to correspond to the high-voltage charging mode, and

wherein, in the low-voltage charging mode, the charger is further configured to charge the batteries, while the batteries are in the parallel connection relationship, with a voltage set to correspond to the low-voltage charging mode.

3. The electronic apparatus of claim 1 , wherein the charging controller is further configured to determine the charging mode to be the high-voltage charging mode in response to the output voltage value being greater than or equal to a threshold voltage and determine the charging mode to be the low-voltage charging mode in response to the output voltage value being less than the threshold voltage.

4. The electronic apparatus of claim 3 , wherein the charging controller is further configured to determine a required voltage value for the charger based on the output voltage value and control the charger based on the determined required voltage value.

5. The electronic apparatus of claim 1 , wherein the charging controller is further configured to determine the output voltage value of the power supplier based on information about an output voltage range of the power supplier and maximum charging efficiency information for each of output voltages in the output voltage range.

6. The electronic apparatus of claim 1 , further comprising:

a first switch configured to electrically connect the charger and a load; and

a second switch configured to electrically connect the charger to the batteries.

7. The electronic apparatus of claim 6 , wherein the charging controller is further configured to control the first switch to interrupt an electrical connection between the charger and the load in a high-voltage charging mode.

8. A method of charging an electronic apparatus, the method comprising:

calculating a required charging current value based on either one or both of an output voltage value of a power supplier and a usage pattern of a user;

determining a charging mode to be a high-voltage charging mode in response to the calculated required charging current value being greater than or equal to a threshold current;

controlling, in the high-voltage charging mode, a switch network electrically connected to batteries such that the batteries are in series connection relationship;

determining the charging mode to be a low-voltage charging mode in response to the calculated required charging current value being less than the threshold current, and controlling, in the low-voltage charging mode, the switch network such that the batteries are in parallel connection relationship.

9. The method of claim 8 , further comprising:

charging the batteries in the low-voltage charging mode, while the batteries are in the parallel connection relationship, with a voltage set to correspond to the low-voltage charging mode in the low-voltage charging mode, and

charging the batteries in the high-voltage charging mode, while the batteries are in the series connection relationship, with a voltage set to correspond to the high-voltage charging mode in the high-voltage charging mode.

10. The method of claim 8 , further comprising:

determining the charging mode to be the high-voltage charging mode in response to auto the output voltage value being greater than or equal to a threshold voltage; and

determining the charging mode to be the low-voltage charging mode in response to the output voltage value being less than the threshold voltage.

11. The method of claim 10 , further comprising:

determining a required voltage value for a charger based on the output voltage value, and controlling the charger based on the determined required voltage value.

12. The method of claim 8 , further comprising:

determining the output voltage value of a the power supplier based on information about an output voltage range of the power supplier and maximum charging efficiency information for each of output voltages in the output voltage range.

13. The method of claim 8 , further comprising:

controlling a switch to interrupt an electrical connection between a charger and a load in the high-voltage charging mode.

14. A non-transitory computer-readable storage medium storing instructions that, when executed by a processor, cause the processor to perform the method of claim 8 .

15. A method of charging an electronic apparatus, the method comprising: determining a charging mode of the electronic apparatus in response to the electronic apparatus being connected to a power supplier; and

charging batteries in the determined charging mode,

wherein the batteries are connected in parallel before the electronic apparatus is connected to the power supplier, and wherein the charging of the batteries comprises:

charging the batteries, while the batteries are connected in parallel, in response to the charging mode being determined to be a low-voltage charging mode; and

changing a connection relationship between the batteries such that the batteries are connected in series and charging the batteries while the batteries are connected in series, in response to the charging mode being determined to be a high-voltage charging mode, wherein the determining of the charging mode comprises:

calculating a required charging current value based on either one or both of an output voltage value of a power supplier and a usage pattern of a user;

determining the charging mode to be the high-voltage charging mode in response to the calculated required charging current value being greater than or equal to a threshold current; and

determining the charging mode to be the low-voltage charging mode in response to the calculated required charging current value being less than the threshold current.