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\rhead{\includegraphics*[scale=0.013]{./Pictures/FaSTTUBe_Logo_ohneAuto.png}}
\rfoot{Page \thepage \hspace{1pt} of \pageref{LastPage}}
\lhead{Car 313, 01.05, Rev. 1}
\chead{\large BSPD Schematic}

\begin{document}

\section{BSPD Schematic and Circuitry}
\begin{figure}[H]
	\centering
	\includegraphics[width=\textwidth]{./Documents/FT25_BSPD.pdf}
	\caption{Schematic of BSPD}
\end{figure}

The BSPD PCB is located in the front Sensor-Node (Where the main PCB for sensor signal processing resides), 
in which a separate compartment is created to ensure the BSPD can be separately sealed without affecting other parts in the same housing.
The current sensor and the brake pressure sensor are connected directly to the BSPD. The datasheet of the sensors used are shown in reference. \cite{lem_datasheet} \cite{adz_datasheet}

\section{SCS signal implementation}
For Out-of-Range signals such as "open circuit", "short circuit to ground", "short circuit to 
supply voltage", the pull-down resistors (\texttt{R3} and \texttt{R4}) are used to ensure that they are out of the valid 
range determined by the reference voltages (\texttt{current\_ref}, \texttt{brake\_ref} and \texttt{low\_ref} in schematic).
Once this happens, the photovoltaic relay (\texttt{U4}) will open the shutdown circuit and the AIRs.\cite{pvg612_datasheet}

\medskip
As shown in the schematic, the error latching is realized with the RC Combination \texttt{R21} and \texttt{C13}. 
In case of an error the open collector output of \texttt{U1A} is discharging \texttt{C13} via a small resistor \texttt{R21}, causing \texttt{U1B} to open the Shutdown Circuit. 
If the error is removed, \texttt{C13} is charged via \texttt{R20} in series with \texttt{R21}, resulting in a time delay of $\approx11.65s$

\begin{align}
	-(ln(1-\SI{3.44}{V}/\SI{5}{V})) \cdot \SI{10}{\micro\farad} \cdot \SI{1}{\mega\ohm} \approx \SI{11.65}{\second}
\end{align}

\newpage
\section{BSPD Test Procedure}
The test procedure is shown here:

\begin{multicols}{2}
	\textbf{Test Procedure}
	\begin{enumerate}
		\item apply external test current to the simulation coil
		\item brake with a pressure of $\geq 30 \unit{\bar}$
	\end{enumerate}
	
	\textbf{Test Current Calculation}
	\begin{align*}
		I_{test} &amp; = 5 \unit{kW} / V_{max} = 5 \unit{kW} / 403.2 \unit{V} \\
		         &amp; = 12.401 \unit{A}
	\end{align*}
	\quad \quad 12 windings $\longrightarrow$ test current $\approx 1.034 \unit{A}$
\end{multicols}

\begin{figure}[H]
	\centering
	\begin{tikzpicture}[node distance=1cm]
		\draw[black, rounded corners, thick] (0,4) rectangle (3,6) node[midway]{Current source};
		\draw[blue, rounded corners=24pt, line width=16pt] (5,4) rectangle (8,6) node[midway]{LEM HO-50S};
		\draw[black, rounded corners, thick] (5,0) rectangle (8,2) node[midway, text width=2.5cm]{Brake Pressure Sensor};
		\draw[black, rounded corners, thick] (12,2) rectangle (15,4) node[midway]{BSPD PCB};
		\draw[-&gt;, rounded corners, ultra thick] (8.3,5) -- (10,5) -- (10,3.5) -- (12,3.5);
		\draw[-&gt;, rounded corners, ultra thick] (8,1) -- (10,1) -- (10,2.5) -- (12,2.5);
		\draw[rounded corners, very thick] (3,5.6) -- (5.6,5.6) -- (4.6,5.2) -- (5.4,5.2) -- (4.6,4.8) -- (5.4,4.8) -- (4.6,4.4) -- (3,4.4);
		\draw[-&gt;, ultra thick] (13.5,5) -- (13.5,4);
		\draw[-&gt;, ultra thick] (13.5,2) -- (13.5,1);
		\draw(13.5,5.5) node[align=left]{SDC in};
		\draw(13.5,0.5) node[align=left]{SDC out};
	\end{tikzpicture}
	\caption{current simulation schematic}
\end{figure}

\bibliographystyle{plain}

\renewcommand\refname{Reference}
\begin{thebibliography}{00}
	
	\bibitem{lem_datasheet} \textit{Current Transducer HO-S series Datasheet}, \href{https://www.lem.com/sites/default/files/products_datasheets/ho-50__250-s_v7.pdf}{www.lem.com}, 03.2022
	\bibitem{adz_datasheet} \textit{ADZ SME 200bar Datasheet}, \href{https://www.adz.de/fileadmin/user_upload/downloads/produkte/SME/ADZ_SME_OperatingManual_DE-EN_A.pdf}{www.adz.de}, 12.2010
	\bibitem{pvg612_datasheet} \textit{PVG612A Datasheet}, \href{https://www.infineon.com/dgdl/Infineon-PVG612A-DataSheet-v01_00-EN.pdf?fileId=5546d462533600a401535683ca14293a}{www.infineon.com}, 05.2015

\end{thebibliography}

\end{document}
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