US 12,479,320 B2
Charging system and electric vehicle
Xueliang Zhang, Xi'an (CN); and Yang Cheng, Xi'an (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Jan. 20, 2022, as Appl. No. 17/579,935.
Claims priority of application No. 202110083917.2 (CN), filed on Jan. 21, 2021.
Prior Publication US 2022/0216723 A1, Jul. 7, 2022
Int. Cl. B60L 53/24 (2019.01); H02J 7/04 (2006.01); H02M 3/158 (2006.01)
CPC B60L 53/24 (2019.02) [H02J 7/04 (2013.01); H02M 3/1582 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A charging system, comprising:
a motor control unit (MCU) having N bridge arms, wherein N is an integer greater than or equal to one, wherein high-potential ends of the N bridge arms are connected to a first power supply end and a first battery end of the charging system, wherein the first power supply end is configured to connect to a positive electrode of a direct current power supply, wherein the first battery end is configured to connect to a positive electrode of a power battery, wherein the direct current power supply is configured to output a power supply voltage, wherein the power battery is configured to receive a first output voltage of the charging system, wherein low-potential ends of the N bridge arms are connected to a second battery end of the charging system, and wherein the second battery end is configured to connect to a negative electrode of the power battery;
a first inductor having one end connected to a second power supply end, wherein the other end of the first inductor is connected to a middle point of a first bridge arm, wherein the second power supply end is configured to connect to a negative electrode of the direct current power supply, wherein the first bridge arm is any of the N bridge arms;
a first switch having a first end coupled to the second battery end and a second end coupled to the second power supply end;
a second switch including a first end coupled to the first battery end, a second end coupled to one end of the first inductor, and a third end coupled to the first power supply end, wherein the second switch is configured to switchably connect the first end of the second switch to either the second end of the second switch or the third end of the second switch; and
a third switch having a first end coupled to one end of the first inductor and a second end coupled to the second power supply end, and wherein
the first bridge arm and the first inductor constitute a voltage conversion circuit, and wherein the MCU is configured to:
turn on the first end and the third end of the second switch, turn on the third switch, and turn off the first switch and perform boost conversion on the power supply voltage by using the voltage conversion circuit;
output the power supply voltage obtained after boost conversion to the power battery as the first output voltage not less than a minimum charging voltage; and
turn on the first end and the second end of the second switch, turn off the third switch, and turn on the first switch and perform buck conversion on the power supply voltage by using the voltage conversion circuit, and output the power supply voltage obtained after buck conversion to the power battery as the first output voltage not greater than a maximum charging voltage.