关于DC转换器的几点思考

　　关于DC / DC转换器的几点思考

　　简介

　　许多系统要求直流电源的主要来源被转换为其他电压。电池驱动电路明显的候选人。在笔记本电脑6V或12V电池必须转换为不同的潜力存储器，磁盘驱动器，显示和操作逻辑。在理论，交流线路供电系统不需要DC / DC转换器因为隐含的电源变压器可以装备具有多个次级。在实践中，经济学，噪音要求，供应总线分配问题和其他限制往往使DC / DC转换。一常见的例子是逻辑为主，5V供电系统利用±15v驱动模拟元件。

　　DC / DC转换器的应用范围是大，有许多变化。兴趣是相应的转换器相当高。增加单电源供电系统，刚度性能要求和电池操作增加了转换器的使用。

　　Historically， effi ciency and size have received heavy emphasis. In fact， these parameters can be signifi cant， but often are of secondary importance. A possible reason behind the continued and overwhelming attention to size and effi ciency in converters proves surprising. Simply put， these parameters are （within limits） relatively easy to achieve！ Size and effi ciency advantages have their place， but other system-oriented problems also need treatment. Low quiescent current， wide ranges of allowable inputs， substantial reductions in wideband output noise and cost effectiveness are important issues. One very important converter class， the 5V to ±15V type， stresses size and effi ciency with little emphasis towards parameters such as output noise. This is particularly signifi cant because wideband output noise is a frequently encountered problem with this type of converter. In the best case， the output noise mandates careful board layout and grounding schemes. In the worst case， the noise precludes analog circuitry from achieving desired performance levels （for further discussion see Appendix A， “The 5V to ±15V Converter — A Special Case”）。 The 5V to ±15V DC/DC conversion requirement is ubiquitous， and presents a good starting point for a study of DC/DC converters.