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什么是调光(PWM 控制)

贺拉斯-贺

最後更新:2023年12月26日

什么是调光(PWM 控制)

調光 (PWM 控制)是一种通过使用脉冲宽度调制(PWM)信号来调节光源(尤其是 LED)亮度的方法。PWM 调光包括在接通和断开状态之间快速切换电信号,从而有效降低平均输出功率。这是通过调整信号的高电平(ON)和低电平(OFF)状态的持续时间来实现的。

与改变输出功率来对 LED 进行调光的模拟调光方法不同,PWM 调光通过在任何给定时间内向 LED 提供全电压或不供电来实现。例如,PWM 信号不是持续提供 12V 电压,而是在特定时间内提供 10V 电压,以达到较低的亮度水平。

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PWM 调光技术的主要优势在于它能够快速开关信号,从而精确控制提供给负载的平均电流和电压。这就实现了高精度、高效率的亮度调节。PWM 调光因其多功能性和有效性而被广泛应用于照明行业,不仅可用于 LED 的调光,还可用于控制电机和各种电气设备。

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