Power Electronics notes from March 19th

6th-Semester-Spring-2024/Power-Electronics/Notes/power-electronics-notes.tex

@@ -152,5 +152,27 @@ The SCR will be off even when $V_{AC} > 0$ until a pulse is applied to the gate.
 	The voltage across the SCR can go negative as long as the current remains positive.
 }
 
+\chapter{Basic DC-DC Converter}
+\section{Voltage Divider}
+A voltage divider can step DC voltage down to another DC voltage. While its construction is simple, it can only perform voltage step-down, and its power loss is typically very high.
+
+\section{BJT Review}
+\begin{center}
+	\textbf{BJT Regions of Operation}\\
+	\begin{tabular}{c | c | c}
+		Cut off & Saturation & Active \\
+		\hline
+	$V_{BE} < 0.7$ & \multicolumn{2}{c}{$V_{BE} > 0.7$} \\
+		\hline
+					   & $V_{CE} = 0.2$[V] & $V_{CE} > 0.2$[V] \\
+		\hline
+		$i_B, i_C, i_E \approx 0$ & ${i_C \over i_B} < \beta$ & $i_C = \beta i_B$\\
+	\end{tabular}
+\end{center}
+
+\section{PWM Averager}
+\subsection{LC Filter Property}
+The resonant frequency of an LC filter is:
+$$f_0 = {1 \over 2\pi \sqrt{LC}}$$
 
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