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    • 24. 发明授权
    • High precision luminance control for PWM-driven lamp
    • PWM驱动灯的高精度亮度控制
    • US06690121B1
    • 2004-02-10
    • US10300225
    • 2002-11-20
    • Paul Fredrick Luther Weindorf
    • Paul Fredrick Luther Weindorf
    • H05B4116
    • H05B41/3927
    • A lamp brightness control for a lamp provides backlight illumination for a display. A brightness-to-current translator generates an electrical current command having a magnitude proportional to a desired lamp current that corresponds to a desired brightness. A PWM generator generates a PWM drive signal having a duty cycle determined in response to a control signal. A lamp driver switches power to the lamp in response to the PWM drive signal. A current sensor generates a current feedback signal in response to a flow of current in the lamp. An error amplifier generates the control signal in response to the electrical current command and the current feedback signal, whereby an actual lamp current is substantially equal to the desired lamp current despite any temperature offsets in the PWM generator or the lamp driver, for example.
    • 灯的灯亮度控制为显示器提供背光照明。 亮度到电流的转换器产生具有与期望亮度对应的期望灯电流成比例的大小的电流指令。 PWM发生器产生具有响应于控制信号确定的占空比的PWM驱动信号。 灯驱动器响应于PWM驱动信号切换到灯的电源。 电流传感器响应于灯中的电流流动而产生电流反馈信号。 误差放大器响应于电流指令和电流反馈信号产生控制信号,由此,尽管PWM发生器或灯驱动器中存在任何温度偏移,实际的灯电流基本上等于所需的灯电流。