Huawei Technologies Co., Limited

Huawei Digital Power Technologies Co., Ltd.

Qinghui Hou

Yan Zhang

Liangjin Chen

Cheng Yang

Gang Ye

Chenghao Sun

Shuai Zheng

Qinglei Wang

An electronic device is provided, which includes a receive coil, a wireless electric energy receiver, a three-level buck circuit, a battery, and a receive end controller. A charging control method is also provided that includes: obtaining a battery voltage, and sending a first control signal and a second control signal based on the battery voltage. The wireless electric energy receiver converts, based on the first control signal, an alternating current generated by the receive coil through induction into a direct current, and outputs a first voltage, V, to charge the battery in a first voltage mode. The three-level buck circuit bucks an output voltage of the wireless electric energy receiver based on the second control signal, and then outputs a voltage to the battery.

Charging control method, electronic device, and wireless charging system

An Active Clamp Flyback (ACF) converter includes a transformer module, a clamping module, and a controller. The controller is configured to: after the transformer module starts secondary side discharging, control the clamping module to start receiving leakage inductance power from the transformer module; and after controlling the clamping module to stop receiving the leakage inductance power from the transformer module, control the clamping module to release the leakage inductance power to the transformer module. The leakage inductance power released by the clamping module to the transformer module is used by the transformer module to restore a soft switching state based on the leakage inductance power. In a process of transferring the leakage inductance power to a clamping capacitor, the clamping module is in an enabled state. This reduces a loss caused by the clamping module to the leakage inductance power, and helps reduce overall loss caused by the ACF converter.

ACF converter, voltage conversion method, and electronic device

This application provides a switched-capacitor converter circuit, a charging control system, and a control method. In the switched-capacitor converter circuit, input terminals of N levels of switched-capacitor converter units are sequentially connected in series, and output terminals of the N levels of switched-capacitor converter units are connected in parallel, to obtain a first power supply branch to supply power to a load. In addition, a first capacitor acts as a second power supply branch to supply power to the load, and the first power supply branch and the second power supply branch transmit power in parallel. In comparison with a serial power transmission manner, there are fewer devices on a power transmission path when a parallel power transmission manner is used. Therefore, this can reduce power losses on the transmission path, and improve transmission efficiency of the switched converter circuit.

Switched-capacitor converter circuit, charging control system, and control method

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Dongguan, China

Qinghui Hou