US 11,757,298 B2
Charging system and method using motor driving system
Su Hyun Bae, Daegu (KR); Jung Mo Yu, Seoul (KR); Jae Ho Hwang, Daejeon (KR); Joo Young Park, Yongin-si (KR); and Yong Jae Lee, Yongin-si (KR)
Assigned to HYUNDAI MOTOR COMPANY, Seoul (KR); and KIA MOTORS CORPORATION, Seoul (KR)
Filed by HYUNDAI MOTOR COMPANY, Seoul (KR); and KIA MOTORS CORPORATION, Seoul (KR)
Filed on Nov. 20, 2020, as Appl. No. 16/953,756.
Claims priority of application No. 10-2020-0051840 (KR), filed on Apr. 28, 2020.
Prior Publication US 2021/0336472 A1, Oct. 28, 2021
Int. Cl. B60L 53/24 (2019.01); H02J 7/16 (2006.01); B60L 53/62 (2019.01); B60L 58/12 (2019.01); H02J 7/00 (2006.01)
CPC H02J 7/16 (2013.01) [B60L 53/24 (2019.02); B60L 53/62 (2019.02); B60L 58/12 (2019.02); H02J 7/0048 (2020.01); H02J 7/007182 (2020.01)] 9 Claims
OG exemplary drawing
 
1. A charging system using a motor driving system, comprising:
an inverter including switching elements connected between a DC connecting terminal and a motor connecting terminal to which a battery is connected and configured to adjust on/off states of the switching elements to perform power conversion between the DC connecting terminal and the motor connecting terminal;
a motor including a plurality of coils connected to the motor connecting terminal;
a first relay having a first end connected to the DC connecting terminal and a second relay having a first end connected to a neutral point of the motor, a second end of the first relay and a second end of the second relay being connected to a charging power input terminal; and
a controller configured to control states of the first relay and the second relay based on a result of comparison between a voltage detection value of the battery and a maximum charging voltage value provided from a charging equipment to the charging power input terminal such that charging power supplied from the charging equipment is provided to the battery,
wherein the controller determines one of a first charging mode and a second charging mode, wherein:
in the first charging mode, the first relay is closed and the second relay is opened such that the charging power is directly applied to the DC connecting terminal to charge the battery, and
in the second charging mode, the first relay is opened and the second relay is closed such that the charging power is applied to the neutral point of the motor and on/off states of the switching elements are controlled to convert the voltage of the charging power applied to the neutral point of the motor and to output the converted voltage to the DC connecting terminal to charge the battery,
wherein the controller changes a charging mode to the second charging mode when the voltage detection value of the battery becomes greater than or equal to the maximum charging voltage value or a state of charge (SOC) corresponding to the voltage detection value of the battery becomes greater than or equal to an SOC corresponding to the maximum charging voltage value during execution of the first charging mode, and
wherein when the controller determines to change the charging mode to the second charging mode, the controller transmits a charging current command of 0 A to the charging equipment, controls states of the first relay and the second relay to the second charging mode when current provided from the charging equipment substantially becomes 0 A, and increases the charging current command such that the battery is charged in the second charging mode.