Huawei Technologies Co., Limited

Huawei Digital Power Technologies Co., Ltd.

Jingbo Xiao

Xingqiang Peng

Shaoqing Dong

Sai He

Liyuan Lu

A drive circuit includes a first drive unit, a second drive unit, and a third drive unit. The first drive unit is configured to: when receiving a first control signal, output a first drive charging current to a gate end, so that a voltage at the gate end reaches a first threshold. The second drive unit is configured to output a second drive charging current to the gate end, so that the voltage at the gate end reaches a second threshold from the first threshold. The third drive unit is configured to: after the voltage at the gate end reaches the second threshold, output a third drive charging current to the gate end. The third drive charging current is greater than the first drive charging current and the second drive charging current. In this way, a turn-on loss may be reduced while meeting an electromagnetic interference requirement of the power device.

Drive circuit and drive system

A conversion circuit and an adapter that resolve a voltage drop problem of a power supply of a driver in an ACF circuit. The conversion circuit includes an active clamp flyback circuit, a drive circuit, and a replenishment power transistor. The active clamp flyback circuit is configured to perform power conversion. The drive circuit is configured to output a drive signal and a reference voltage. The drive signal is used to drive the active clamp flyback circuit. A first terminal of the replenishment power transistor is coupled to an input terminal of the active clamp flyback circuit, a second terminal of the replenishment power transistor is coupled to a power supply terminal of the drive circuit, and a gate of the replenishment power transistor is configured to receive the reference voltage.

Growing community of inventors

Dongguan, China

Jingbo Xiao