耦合和非耦合電感SEPIC比較電壓轉(zhuǎn)換器

　　單端初級(jí)電感型DC-DC變換器（SEPIC）是一個(gè)靈活的拓?fù)浣Y(jié)構(gòu)，可以作為一個(gè)降壓（“巴克”）和升壓（提高）的電壓調(diào)節(jié)器。該設(shè)計(jì)是受歡迎的工程師，因?yàn)樗哂凶钚〉挠性丛粋€(gè)簡(jiǎn)單的控制器，和鉗位開關(guān)波形，提供低噪聲操作。

　　SEPIC是用兩個(gè)電感的區(qū)別。電感器可以保持分開（“耦合”）或纏繞到一個(gè)共同的核心（“耦合”）。對(duì)于電路的工作方式幾乎沒有什么區(qū)別，設(shè)計(jì)者往往不確定哪種方法最好，或者兩者之間是否存在真正的區(qū)別。

　　本文將仔細(xì)看看這兩種類型，突出的差異，并解釋了各自的優(yōu)點(diǎn)和缺點(diǎn)。

　　Add one inductor

　　Unlike linear voltage regulators， switching DC-DC regulators are able to flip from a buck to boost mode when the battery voltage drops below what is required at the regulator output. The boost configuration is useful because it allows more of the battery’s energy to be accessed.

　　The SEPIC regulator is based on a standard buck/boost design but with an extra inductor and capacitor. A key advantage of the SEPIC topology is that， unlike the conventional buck/boost regulator， it does not invert the output voltage compared to the input.