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

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.

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.