公开(公告)号：US06426569B1

公开(公告)日：2002-07-30

申请号：US09616011

申请日：2000-07-13

申请人： Shigehisa Ichikawa ,  Kang Li

发明人： Shigehisa Ichikawa ,  Kang Li

IPC分类号： H02G300

CPC分类号： H05B39/047 ,  Y02B20/144

摘要： A variable frequency pulse width modulated apparatus and method supplies variable frequency and variable duty cycle power to a load, particularly an electric load of a motor vehicle, and preferably to a filament-type lamp such as a headlight. Which one of the two frequencies are selected is based on a monitored battery parameter, such as a comparison between the current supplied to the battery by an alternator and the current drawn from the battery by a load, with a higher one of the two frequencies being selected when the input current exceeds the output current and the lower frequency being selected when the battery input current is less than the output current. The duty cycle is variably selectable with either first or second pulse width modulated frequency.

摘要翻译： 可变频率脉宽调制装置和方法向负载特别是机动车辆的电力负载提供可变频率和可变占空比功率，并且优选地向诸如头灯的灯丝型灯提供。 选择两个频率中的哪一个是基于所监视的电池参数，例如由交流发电机提供给电池的电流与由负载从电池中抽出的电流之间的比较，两个频率中较高的一个是 当输入电流超过输出电流时选择，当电池输入电流小于输出电流时选择较低频率。 占空比通过第一或第二脉宽调制频率可变地选择。