公开(公告)号：US20090174440A1

公开(公告)日：2009-07-09

申请号：US12346069

申请日：2008-12-30

申请人： Tsz Yin MAN ,  Kwok Tai Philip MOK ,  Man Sun John CHAN

发明人： Tsz Yin MAN ,  Kwok Tai Philip MOK ,  Man Sun John CHAN

IPC分类号： H03B23/00

CPC分类号： H02M1/44 ,  H02M3/156 ,  H02M2001/0032 ,  Y02B70/16

摘要： A frequency-hopping pulse-width modulator is disclosed, which facilitates a switching regulator to use smaller-size inductive and capacitive elements, to have an improved power efficiency at light load, as well as predictable spectrum at different load levels. The improved modulator automatically determines the switching frequency of a switching regulator according to the load current delivered by the switching regulator from a number of pre-defined frequencies, which are all multiples of a fundamental frequency. By designing the maximum switching frequency of frequency-hopping pulse-width modulator in the MHz range, a switching regulator is able to use smaller-size inductive and capacitive elements. Light-load efficiency of the switching regulator with the frequency-hopping pulse-width modulator is also greatly improved as switching frequency of such switching regulator is reduced with decreased load current. More importantly, spectrum of a switching regulator with the frequency-hopping pulse-width modulator is as predictable as spectrum of a switching regulator with a conventional pulse-width modulator operated at the fundamental frequency.

摘要翻译： 公开了一种跳频脉冲宽度调制器，其有助于开关调节器使用较小尺寸的电感和电容元件，以在轻负载下具有改进的功率效率，以及在不同负载水平下具有可预测的频谱。 改进的调制器根据开关稳压器从多个预定频率（其基本频率的倍数）输出的负载电流自动确定开关稳压器的开关频率。 通过在MHz范围内设计跳频脉宽调制器的最大开关频率，开关稳压器能够使用较小尺寸的电感和电容元件。 具有跳频脉宽调制器的开关稳压器的轻负载效率也大大提高，因为这种开关调节器的开关频率随着负载电流的减小而减小。 更重要的是，具有跳频脉冲宽度调制器的开关稳压器的频谱与具有在基频操作的常规脉宽调制器的开关调节器的频谱一样可预测。