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AssigneeCrm Icbg (Wuxi) Co., Ltd.
InventorsJin Li, Yong You, Changquan Lin, Guocheng Li, Bingyin Luo, Shengsheng Lu
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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.
A drive circuit with zero-crossing detection function, comprising:
A zero-crossing detection method, applied to a switching power supply circuit operating in critical conduction mode, wherein the zero-crossing detection method at least comprises:
Dependencies are inferred from the claim text.