Drive circuit with zero-crossing detection function, and zero-crossing detection method
A drive circuit with a zero-crossing detection function, and a zero-crossing detection method. The drive circuit comprises: a power switch transistor, a pull-up drive transistor, a first pull-down drive transistor and a second pull-down drive transistor. When an inductor starts to discharge, the first pull-down current and the second pull-down current jointly pull down a gate terminal of the power switch transistor, such that the power switch transistor is in a cut-off state; after a set time, the first pull-down current is turned off; and when the inductor ends discharging, a parasitic capacitance of the power switch transistor couples with the drop signal, and when the drop signal is detected, the pull-up current pulls up the gate terminal of the power switch transistor, such that the power switch transistor is in a turn-on state.
CRM ICBG (wuxi) Co., ltd.
H H G Y H H H H H
H02M H02M G01R Y02B H03K H03K H03K H02M H03K
additional inventional inventional additional inventional inventional inventional inventional inventional
Changquan Yong Bingyin Shengsheng Guocheng Jin
Lin You Luo Lu Li Li