支持UVLO功能

许多栅极驱动IC光耦具有UVLO(欠电压锁定)功能,以防止在低电压下发生故障。该功能将停止光耦输出,直到栅极驱动光耦的电源电压达到UVLO释放电压(例如当电源接通时),并防止功率器件在输入电压启动过程中发生故障。当电源电压在运行过程中下降并低于UVLO检测电压时,运行停止。
该功能可防止功率器件驱动不足。当电源电压升高并超过UVLO释放电压时,UVLO被释放。

部分逆变器电路
部分逆变器电路
UVLO操作示例
UVLO操作示例

VUVLO+:UVLO释放电压当耦合器的电源电压超过此电压时,光耦的输出返回。

VUVLO-:UVLO检测电压当耦合器电源电压降至该电压以下时,光耦输出停止。

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