On-board battery charger for electric vehicles and control method thereof

1. An on-board battery charger which cooperates with a battery management system (BMS) and charges batteries by converting alternating current power input from an external charging facility into direct current power, the on-board battery charger comprising a memory and a processor, the memory configured to store program instructions and the processor configured to execute the program instructions, the program instructions when executed configured to:

sense a voltage value of power input from the charging facility in the initial stage of charging which the charging facility is connected to charge the batteries;

receive a pulse width modulation (PWM) signal of a current value of the power from the charging facility;

calculate an output voltage value to be output to the batteries using the sensed voltage value of the input power;

calculate an output current value to be output to the batteries using a duty value of the received PWM signal; and

transmit the calculated output voltage and current values to the cooperating BMS to calculate an estimated charging time.

2. The on-board battery charger of claim 1 , wherein the program instructions when executed are further configured to:

receive a calculated charging capacity calculated using the transmitted output voltage and current values.

3. The on-board battery charger of claim 2 , wherein information regarding the received estimated charging time and capacity is transmitted to the external charging facility.

4. The on-board battery charger of claim 1 , wherein the cooperation with the BMS is determined by a controller area network (CAN) protocol.

5. The on-board battery charger of claim 1 , wherein the power supplied from the charging facility has rated voltage of about 220 V or 110 V.

6. A control method of an on-board battery charger which cooperates with a battery management system (BMS) and charges batteries by converting alternating current power input from an external charging facility into direct current power, the control method comprising:

sensing, by a processor, a voltage value of power input from the charging facility in the initial stage of charging which the charging facility is connected to charge the batteries;

receiving, by the processor, a pulse width modulation (PWM) signal of a current value of the power from the charging facility;

calculating, by the processor, an output voltage value to be output to the batteries using the sensed voltage value of the input power;

calculating, by the processor, an output current value to be output to the batteries using a duty value of the received PWM signal; and

transmitting, by the processor, the calculated output voltage and current values to the cooperating BMS; and

receiving, by the processor, information regarding a calculated estimated charging time from the BMS, wherein the estimated charging time is calculated using the transmitted output voltage and current values.

7. The control method of claim 6 , further comprising:

receiving, by the processor, a calculated charging capacity from the BMS calculating using the transmitted output voltage and current values.

8. The control method of claim 7 , further comprising:

transmitting, by the processor, information regarding the received estimated charging time and capacity to the external charging facility.

9. The control method of claim 6 , wherein the cooperation with the BMS is determined by a controller area network (CAN) protocol.

10. The control method of claim 6 , wherein the power supplied from the charging facility has rated voltage of about 220 V or 110 V.

11. A non-transitory computer readable medium containing program instructions executed by a processor, the computer readable medium comprising:

program instructions that sense a voltage value of power input from the charging facility in the initial stage of charging which the charging facility is connected to charge the batteries;

program instructions that receive a pulse width modulation (PWM) signal of a current value of the power from the charging facility;

program instructions that calculate an output voltage value to be output to the batteries using the sensed voltage value of the input power;

program instructions that calculate an output current value to be output to the batteries using a duty value of the received PWM signal; and

program instructions that transmit the calculated output voltage and current values to the cooperating BMS; and

program instructions that receive information regarding a calculated estimated charging time from the calculated using the transmitted output voltage and current values.

12. The non-transitory computer readable medium of claim 11 , further comprising:

program instructions that receive a calculated charging capacity from the BMS, calculated using the transmitted output voltage and current values.

13. The non-transitory computer readable medium of claim 12 , further comprising:

program instructions that transmit information regarding the received estimated charging time and capacity to the external charging facility.

14. The non-transitory computer readable medium of claim 11 , wherein the cooperation with the BMS is determined by a controller area network (CAN) protocol.

15. The non-transitory computer readable medium of claim 11 , wherein the power supplied from the charging facility has rated voltage of about 220 V or 110 V.