公开(公告)号：US20210184486A1

公开(公告)日：2021-06-17

申请号：US17123022

申请日：2020-12-15

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Zhimin Dan ,  Jinbo Cai ,  Meilin Chen ,  Yizhen Hou ,  Wei Zhang

IPC: H02J7/00 ,  H02J7/34

Abstract: This application relates to a pre-charging circuit and a method thereof. The pre-charging circuit includes a controller, a PWM control unit, and a drive unit. The controller and the PWM control unit are electrically connected to the drive unit, and the drive unit is connected to a main switch of a battery management system circuit. When the main switch is turned on, the PWM control unit detects a current in the battery management system circuit and outputs a control signal to the drive unit according to the current. The controller outputs a preset PWM signal to the drive unit, which then turns the main switch off or on according to the received control signal and the PWM signal, to pre-charge a load capacitor of the battery management system circuit when the main switch (S1) is turned on, thereby implementing fast pre-charging by adjusting a pre-charging time of the load capacitor.

公开(公告)号：US11962174B2

公开(公告)日：2024-04-16

申请号：US17122955

申请日：2020-12-15

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Wei Zhang ,  Zhimin Dan ,  Jinbo Cai ,  Yizhen Hou ,  Meilin Chen

IPC: H02J7/00

CPC classification number: H02J7/00304 ,  H02J7/0068

Abstract: This application discloses a protection circuit associated with a battery management system (BMS). The protection circuit includes a first protection module and a freewheeling module. The first protection module is connected in parallel to a first switch module of the BMS, and the freewheeling module is connected in parallel to a load module of the BMS. The first protection module switches to a charging state when the first switch module is turned off to stabilize a voltage between a first terminal of the first switch module and a second terminal of the first switch module. The freewheeling module is turned on when the first switch module is turned off to stabilize a voltage between the first switch module and the second switch module. The protection circuit mitigates risks of breakdown of the first switch module, and prevents a parasitic inductance from limiting a switching frequency of the first switch module.

公开(公告)号：US20210104903A1

公开(公告)日：2021-04-08

申请号：US17122955

申请日：2020-12-15

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Wei Zhang ,  Zhimin Dan ,  Jinbo Cai ,  Yizhen Hou ,  Meilin Chen

IPC: H02J7/00

Abstract: This application discloses a protection circuit associated with a battery management system (BMS). The protection circuit includes a first protection module and a freewheeling module. The first protection module is connected in parallel to a first switch module of the BMS, and the freewheeling module is connected in parallel to a load module of the BMS. The first protection module switches to a charging state when the first switch module is turned off to stabilize a voltage between a first terminal of the first switch module and a second terminal of the first switch module. The freewheeling module is turned on when the first switch module is turned off to stabilize a voltage between the first switch module and the second switch module. The protection circuit mitigates risks of breakdown of the first switch module, and prevents a parasitic inductance from limiting a switching frequency of the first switch module.