摘要
本文讨论了基于DVB-S标准的机顶盒天线驱动电源的工作特点。13V的电源用于垂直极化天线的驱动,18V的电源用于水平极化天线的驱动。文中设计了一个可切换交替工作的升压转换器用于产生这两种不同的输出电压,并详细探讨了升压转换器从12V升压到13V工作时输出纹波大的原因。针对这一问题,本文给出了降低工作频率或额外串联一个二极管的设计方案,最后给出了实验波形和测试结果。
This paper discusses the operation principle of power supply for driving outdoor horizontal and vertical polarization antenna in set top box based on the DVB-S standard. 13V is used to drive the horizontal polarization antenna and 18V is used to drive the vertical polarization antenna.A boost converter is designed to produce 13V and 18V alternatively and the reasons of high output voltage ripple of the converter from 12V to 13V is discussed in detail.The paper presents a solution of operating at relative low switching frequency or adds an additional external diode.At last,it provides the waveforms and the test results.
出处
《电子设计应用》
2009年第11期80-81,共2页
Electronic Design & Application World
