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    • 9. 发明授权
    • System and method for employing pulse width modulation with a bridge frequency sweep to implement color mixing lamp drive scheme
    • 采用脉冲宽度调制与桥式扫频实现混色灯驱动方式的系统和方法
    • US06653799B2
    • 2003-11-25
    • US09918093
    • 2001-07-30
    • David A. Cammack
    • David A. Cammack
    • H05B3702
    • H05B41/3928H02M2007/4815H05B41/2928Y02B20/202Y02B20/208Y02B70/1441
    • A gas discharge lamp is driven by a bridge circuit which produces a pulse voltage signal. The bridge circuit is pulse width modulated at an operational frequency, and has a power input for receiving power from a power source, and a control signal input for receiving a control signal that effects sweeping of the operational frequency and generation of the pulse voltage signal. The system further includes a controller for controlling the bridge circuit, the controller comprising circuitry for (i) generating a signal comprising a frequency swept signal that is amplitude modulated by a fixed frequency signal, the highest frequency of the frequency swept signal being lower than the operational frequency, and the signal generated by the controller being inputted into the control signal input of the bridge circuit, and (ii) periodically sweeping the operational frequency of the bridge circuit. The system further includes a filter circuit for filtering the pulse voltage signal.
    • 气体放电灯由产生脉冲电压信号的桥式电路驱动。 桥接电路以工作频率进行脉宽调制,具有用于从电源接收功率的电力输入,以及用于接收实现扫描工作频率和产生脉冲电压信号的控制信号的控制信号输入。 该系统还包括用于控制桥接电路的控制器,该控制器包括用于(i)产生包括由固定频率信号幅度调制的频率扫描信号的信号的电路,频率扫描信号的最高频率低于 操作频率,由控制器产生的信号输入到桥式电路的控制信号输入端,以及(ii)周期性地扫描桥式电路的工作频率。 该系统还包括用于对脉冲电压信号进行滤波的滤波电路。