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    • 3. 发明授权
    • Synchronized PWM-dimming with random phase
    • 同步PWM调光与随机相位
    • US09578702B2
    • 2017-02-21
    • US14273732
    • 2014-05-09
    • Bernhard SiesseggerReinhard Lecheler
    • Bernhard SiesseggerReinhard Lecheler
    • H05B33/08
    • H05B33/0818
    • PWM-based dimming techniques are provided for lighting systems. The techniques can be used to eliminate or otherwise reduce the potential for strobing and flickering, and may be implemented, for example, in a driver suitable for powering LED lighting systems, but can be used with other suitable light sources as well. In an example embodiment, the potential for line frequency induced flicker, or even line disturbances that are periodic with the line frequency, can be eliminated or reduced by synchronizing the PWM frequency to the line frequency or so-called mains frequency, and the potential for strobing can be eliminated or reduced by either using a randomized phase angle on a cycle-to-cycle basis or by using multiple PWM LED drive circuits all having constant cycle-to-cycle phase angle but a different phase angle from drive circuit to drive circuit (or different from LED string to LED string, as the case may be).
    • 为照明系统提供了基于PWM的调光技术。 这些技术可用于消除或以其他方式减少选通和闪烁的可能性,并且可以例如在适于为LED照明系统供电的驱动器中实现,但也可以与其他合适的光源一起使用。 在一个示例实施例中,通过将PWM频率与线路频率或所谓的电源频率同步,可以消除或减少线路频率引起的闪烁的电位,或甚至与线路频率周期性的线路干扰, 可以通过在循环至循环基础上使用随机相位角或通过使用多个PWM LED驱动电路来消除或减少选通,所述PWM驱动电路具有恒定的周期到周期相位角,但是与驱动电路到驱动电路的不同相位角 (或根据情况可能不同于LED串到LED串)。