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    • 82. 发明授权
    • Method and system for high efficiency, fast transient multi-channel LED driver
    • 高效率,快速瞬态多通道LED驱动器的方法和系统
    • US08058810B2
    • 2011-11-15
    • US12437273
    • 2009-05-07
    • Min ChenBryan Avery Legates
    • Min ChenBryan Avery Legates
    • H05B39/04
    • H03K7/08H05B33/0827
    • System and method for a light emitting diode (LED) driver are disclosed. To supply an LED bus voltage to a large array of LEDs organized in multiple channels where one or more LEDs are connected in series in each channel, an LED driver includes a power converter, a feedback generation circuit, and a phase-division based controller. The power converter is configured for providing the LED bus voltage to the multiple LED channels based on a voltage control signal. The feedback generation circuit is configured for generating a feedback signal based on the LED bus voltage supplied to the multiple LED channels. The phase-division based controller is configured for generating the voltage control signal based on the feedback signal and information from the multiple LED channels. The phase-division based controller divides each pulse width modulation (PWM) of each channel into a tracking phase and a pre-charging phase so that the LED bus voltage supplied to the multiple channels changes between the tracking phase and the pre-charging phase.
    • 公开了用于发光二极管(LED)驱动器的系统和方法。 为了将LED总线电压提供给组合在多个通道中的LED阵列,其中一个或多个LED在每个通道中串联连接,LED驱动器包括功率转换器,反馈产生电路和基于相位的控制器。 功率转换器被配置为基于电压控制信号将LED总线电压提供给多个LED通道。 反馈产生电路被配置为基于提供给多个LED通道的LED总线电压来产生反馈信号。 基于相位分配的控制器被配置为基于反馈信号和来自多个LED通道的信息来产生电压控制信号。 基于相位的控制器将每个通道的每个脉冲宽度调制(PWM)分为跟踪阶段和预充电阶段,以便提供给多个通道的LED总线电压在跟踪阶段和预充电阶段之间变化。