Charging method and charging system

1. A charging method, comprising:

charging an auxiliary power source and at least one charging power source simultaneously, wherein a power demand of the auxiliary power source is a first consideration, and a power demand of the at least one charging power source is a second consideration, wherein charging the auxiliary power source and the at least one charging power source simultaneously comprises:

detecting a charging current value of each of the at least one charging power source;

detecting an auxiliary current value for the auxiliary power source;

setting a charging schedule comprising a plurality of charging combinations, wherein each of the charging combinations comprises at least one of the at least one charging power source, and a sum of the charging current value of the at least one of the at least one charging power source and the auxiliary current value is not greater than a current threshold value; and

charging the auxiliary power source and the at least one of the at least one charging power source according to the charging schedule;

detecting the auxiliary current value of the auxiliary power source and a total charging current value of the at least one charging power source;

if a sum of the auxiliary current value and the total charging current value is not greater than the current threshold value, determining whether a charging time is reached or not, if the charging time is not reached, continuing to detect and determine whether the sum of the auxiliary current value and the total charging current value is greater than the current threshold or not; and

stopping charging the auxiliary power source when the sum of the auxiliary current value and the total charging current value is greater than the current threshold value.

2. The charging method of claim 1 , comprising:

storing the auxiliary current value detected before stopping charging the auxiliary power source; and

restarting to charge the auxiliary power source when the auxiliary power source is not under charging and if the sum of the auxiliary current value which is stored and the total charging current value is not greater than the current threshold.

3. The charging method of claim 1 , wherein stopping charging the auxiliary power source comprises:

turning off an auxiliary switching element which is coupled to the auxiliary power source.

4. The charging method of claim 1 , wherein before an operation of stopping charging the auxiliary power source comprises:

stopping charging at least one of the at least one charging power source other than a main charging power source.

5. The charging method of claim 4 , wherein stopping charging the at least one of the at least one charging power source other than the main charging power source comprises:

turning off a charging switching element corresponding to the at least one of the at least one charging power source.

6. The charging method of claim 1 , wherein before an operation of stopping charging the auxiliary power source comprises:

stopping charging each of the at least one charging power source other than a main charging power source.

7. The charging method of claim 1 , wherein setting the charging schedule comprises:

calculating a charging current threshold by subtracting the auxiliary current value from the current threshold, and a sum of the charging current of the at least one of the at least one charging power source comprised in the charging combination is not greater than the charging current threshold.

8. The charging method of claim 7 , wherein the at least one charging power source comprises a plurality of charging power sources, wherein the charging power sources comprises a first charging power source, a second charging power source, and a third charging power source, and the charging combinations comprise a first charging combination, a second charging combination, and a third charging combination, wherein setting the charging schedule comprises:

selecting the second charging power source or the third charging power source according to the charging current threshold to form the first charging combination, wherein the first charging combination comprises at least the first charging power source, and the first charging power source is a main charging power source of the first charging combination;

selecting the first charging power source or the third charging power source according to the charging current threshold to form the second charging combination, wherein the second charging combination comprises at least the second charging power source, and the second charging power source is a main charging power source of the second charging combination; and

selecting the first charging power source or the second charging power source according to the charging current threshold to form the third charging combination, wherein the third charging combination comprises at least the third charging power source, and the third charging power source is a main charging power source of the third charging combination.

9. A charging system, comprising:

an auxiliary current detecting device configured to detect an auxiliary current value when an auxiliary power source is under charging, wherein a power demand of the auxiliary power source is a first consideration;

a charging current detecting device configured to detect a total charging current value when at least one charging power source is under charging, wherein a power demand of the at least one charging power source is a second consideration; and

a controller connected to the auxiliary current detecting device and the charging current detecting device, and the controller is configured to determine whether a sum of the auxiliary current value and the total charging current value is greater than a current threshold value or not, wherein if the sum of the auxiliary current value and the total charging current value is greater than the current threshold value, the controller stops charging the auxiliary power source;

wherein the charging current detecting device is configured to detect a charging current value of each of the at least one charging power source, wherein the controller sets a charging schedule comprising a plurality of charging combinations, wherein each of the charging combination comprises at least one of the at least one charging power source, and the sum of the charging current value of the at least one of the at least one charging power source and the auxiliary current value is not greater than the current threshold value, and the controller charges the auxiliary power source and the at least one of the at least one charging power source according to the charging schedule;

wherein if the sum of the auxiliary current value and the total charging current value is not greater than the current threshold value, the controller determines whether a charging time is reached or not, if the charging time is not reached, the controller continues to detect and determine whether the sum of the auxiliary current value and the total charging current value is greater than the current threshold or not.

10. The charging system of claim 9 , wherein when a charging of the auxiliary power source is stopped, the controller stores the auxiliary current value detected before stopping charging the auxiliary power source, and if a sum of the total charging current value and the auxiliary current value which is stored by the controller is not greater than the current threshold, the controller restarts charging the auxiliary power source.

11. The charging system of claim 10 , further comprising:

an auxiliary switching element turning on or off according to an auxiliary control signal transmitted by the controller to start or stop charging the auxiliary power source; and

at least one charging switching element turning on or off according to at least one charging control signal in correspondence transmitted by the controller to start or stop charging the at least one charging power source in correspondence.

12. The charging system of claim 11 , further comprising:

an auxiliary power source driver configured to receive the auxiliary control signal and configured to control the auxiliary switching element according to the auxiliary control signal; and

at least one charging power source driver configured to receive the at least one charging control signal in correspondence, wherein the at least one charging power source driver controls the at least one charging switching element in correspondence according to the at least one charging control signal.

13. The charging system of claim 9 , wherein before the controller stops charging the auxiliary power source, the controller stops charging at least one of the at least one charging power source other than a main charging power source.

14. The charging system of claim 9 , wherein before the controller stops charging the auxiliary power source, the controller stops charging each of the at least one charging power source other than a main charging power.

15. The charging system of claim 9 , wherein the controller further subtracts the auxiliary current value from the current threshold to calculate a charging current threshold, and the sum of the charging current of the at least one of the at least one charging power source comprised in the charging combinations is not greater than the charging current threshold.

16. The charging system of claim 15 , wherein the at least one charging power source comprises a plurality of charging power sources, wherein the charging power sources comprises a first charging power source, a second charging power source and a third charging power source, and the charging combinations comprise a first charging combination, a second charging combination, and a third charging combination;

wherein the controller further determines that the first charging combination comprises at least the first charging power source, and that the first charging power source is a main charging power source of the first charging combination, and the controller selects the second charging power source or the third charging power source according to the charging current threshold to form the first charging combination,

wherein the controller determines that the second charging combination comprises at least the second charging power source, and that the second charging power source is a main charging power source of the second charging combination, and the controller selects the first charging power source or the third charging power source according to the charging current threshold to form the second charging combination,

wherein the controller determines that the third charging combination comprises at least the third charging power source, and that the third charging power source is a main charging power source of the third charging combination, and the controller selects the first charging power source or the second charging power source according to the charging current threshold value to form the third charging combination.