LED驱动恒功率
恒功率输出的LED驱动大家有没有碰到过？61347-2-13范围里面有提到纯电压或纯电流，这里的“纯”怎么理解？61347-2-13 scope：
Controlgear for LED modules specified in this standard are designed to provide constant
voltage or current at SELV or higher voltages. Deviations from the pure voltage and current
types do not exclude the gear from this standard.
既恒压又恒流的LED驱动，大家有没有碰到过？
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