108 lines
4.7 KiB
TeX
108 lines
4.7 KiB
TeX
\documentclass[paper=A4]{article}
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\usepackage[utf8]{inputenc}
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\usepackage[a4paper, left=2cm, right=2cm, top=2cm, bottom=2cm]{geometry}
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\usepackage{tikz}
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\usetikzlibrary{calc,shapes.geometric, arrows}
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\usepackage{siunitx}
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\sisetup{
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group-separator = {.},
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input-decimal-markers={.},
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output-decimal-marker = {,},
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group-minimum-digits=4}
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\usepackage{graphicx}
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\usepackage{fancyhdr}
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\usepackage{lastpage}
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\usepackage{subfigure}
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\usepackage{float}
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\usepackage{multicol}
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\usepackage{amsmath, amssymb}
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\usepackage{hyperref}
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\pagestyle{fancy}
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\fancyhf{}
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\rhead{\includegraphics*[scale=0.013]{./Pictures/FaSTTUBe_Logo_ohneAuto.png}}
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\rfoot{Page \thepage \hspace{1pt} of \pageref{LastPage}}
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\lhead{Car 313, 01.05, Rev. 1}
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\chead{\large BSPD Schematic}
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\begin{document}
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\section{BSPD Schematic and Circuitry}
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\begin{figure}[H]
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\centering
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\includegraphics[width=\textwidth]{./Documents/FT25_BSPD.pdf}
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\caption{Schematic of BSPD}
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\end{figure}
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The BSPD PCB is located in the front Sensor-Node (Where the main PCB for sensor signal processing resides),
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in which a separate compartment is created to ensure the BSPD can be separately sealed without affecting other parts in the same housing.
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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}
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\section{SCS signal implementation}
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For Out-of-Range signals such as "open circuit", "short circuit to ground", "short circuit to
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supply voltage", the pull-down resistors (\texttt{R3} and \texttt{R4}) are used to ensure that they are out of the valid
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range determined by the reference voltages (\texttt{current\_ref}, \texttt{brake\_ref} and \texttt{low\_ref} in schematic).
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Once this happens, the photovoltaic relay (\texttt{U4}) will open the shutdown circuit and the AIRs.\cite{pvg612_datasheet}
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\medskip
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As shown in the schematic, the error latching is realized with the RC Combination \texttt{R21} and \texttt{C13}.
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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.
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If the error is removed, \texttt{C13} is charged via \texttt{R20} in series with \texttt{R21}, resulting in a time delay of $\approx11.65s$
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\begin{align}
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-(ln(1-\SI{3.44}{V}/\SI{5}{V})) \cdot \SI{10}{\micro\farad} \cdot \SI{1}{\mega\ohm} \approx \SI{11.65}{\second}
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\end{align}
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\newpage
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\section{BSPD Test Procedure}
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The test procedure is shown here:
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\begin{multicols}{2}
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\textbf{Test Procedure}
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\begin{enumerate}
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\item apply external test current to the simulation coil
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\item brake with a pressure of $\geq 30 \unit{\bar}$
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\end{enumerate}
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\textbf{Test Current Calculation}
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\begin{align*}
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I_{test} & = 5 \unit{kW} / V_{max} = 5 \unit{kW} / 403.2 \unit{V} \\
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& = 12.401 \unit{A}
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\end{align*}
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\quad \quad 12 windings $\longrightarrow$ test current $\approx 1.034 \unit{A}$
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\end{multicols}
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\begin{figure}[H]
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\centering
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\begin{tikzpicture}[node distance=1cm]
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\draw[black, rounded corners, thick] (0,4) rectangle (3,6) node[midway]{Current source};
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\draw[blue, rounded corners=24pt, line width=16pt] (5,4) rectangle (8,6) node[midway]{LEM HO-50S};
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\draw[black, rounded corners, thick] (5,0) rectangle (8,2) node[midway, text width=2.5cm]{Brake Pressure Sensor};
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\draw[black, rounded corners, thick] (12,2) rectangle (15,4) node[midway]{BSPD PCB};
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\draw[->, rounded corners, ultra thick] (8.3,5) -- (10,5) -- (10,3.5) -- (12,3.5);
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\draw[->, rounded corners, ultra thick] (8,1) -- (10,1) -- (10,2.5) -- (12,2.5);
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\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);
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\draw[->, ultra thick] (13.5,5) -- (13.5,4);
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\draw[->, ultra thick] (13.5,2) -- (13.5,1);
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\draw(13.5,5.5) node[align=left]{SDC in};
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\draw(13.5,0.5) node[align=left]{SDC out};
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\end{tikzpicture}
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\caption{current simulation schematic}
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\end{figure}
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\bibliographystyle{plain}
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\renewcommand\refname{Reference}
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\begin{thebibliography}{00}
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\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
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\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
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\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
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\end{thebibliography}
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\end{document}
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