公开(公告)号：US20230013471A1

公开(公告)日：2023-01-19

申请号：US17955290

申请日：2022-09-28

Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Inventor： Chenghao SUN ,  Chengyong LIU ,  Jie REN ,  Xue ZHANG

IPC: H02J7/06 ,  H02J7/00 ,  H02M3/335 ,  H02M7/06 ,  H01M10/44

Abstract: Embodiments of this application provide charging apparatuses, charging apparatus control methods, and charging systems, and relate to the field of terminal device charging technologies. The charging apparatus includes a rectifier circuit, a transformer, a lower bridge switch, a clamp capacitor, an upper bridge switch, and a controller. The transformer includes a primary coil and at least one secondary coil. The controller is configured to control the upper bridge switch and the lower bridge switch to be alternatively turned on. The controller is further configured to obtain a sampling waveform at a location at which the controller is electrically connected to the transformer when the lower bridge switch is turned off, and, when the sampling waveform is abnormal, turn off the lower bridge switch in a first phase of a next charging cycle. The sampling waveform includes a voltage waveform of the primary coil or a voltage waveform of the secondary coil.

公开(公告)号：US20230198280A1

公开(公告)日：2023-06-22

申请号：US18170603

申请日：2023-02-17

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Shengyong DAI ,  Xue ZHANG ,  Liang WU

IPC: H02J7/00

CPC classification number: H02J7/007182 ,  H02J7/00036 ,  H02J2207/40

Abstract: A charging circuit, an adapter, and a charging system and method are applied to a charging process of a terminal device. The terminal device may be charged by using an adapter having no electrolytic capacitor, which is conducive to achieving miniaturization of the adapter. When a voltage of a charging interface of the terminal device is low, the charging circuit may discharge by using a terminal battery, to maintain the voltage of the charging interface. The charging circuit may also decrease a charging current provided to the terminal battery, to maintain the voltage of the charging interface. The voltage of the charging interface may be equivalent to a voltage of an output interface of the adapter.

公开(公告)号：US20230179117A1

公开(公告)日：2023-06-08

申请号：US18163481

申请日：2023-02-02

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Jie REN ,  Xue ZHANG ,  Jun YAO

IPC: H02M7/483 ,  H02M1/00

CPC classification number: H02M7/4837 ,  H02M1/0095 ,  H02M1/0058 ,  H02M7/5387

Abstract: An active clamp flyback circuit includes: a clamp capacitor that is connected to a primary-side winding of a transformer and that is configured to absorb leakage inductance energy of the primary-side winding; an auxiliary switching transistor that is configured to control the clamp capacitor to perform reverse excitation power charging on the primary-side winding by using the auxiliary switching transistor; a first diode, where the first diode is connected in series between the clamp capacitor and the auxiliary switching transistor; and a second diode, where the second diode is connected between the first diode and the clamp capacitor , and the second diode is connected in series between the clamp capacitor and a primary-side auxiliary winding.