sdc overcurrent and latching

SDC-schematic/SDC-schematic.tex

@@ -34,6 +34,10 @@
 \includepdf[pages=-]{./Documents/SDC.pdf}
 \includepdf[pages=-]{./Documents/Master_FT25-IO.pdf}
 \includepdf[pages=-]{./Documents/Master_FT25-SDC_Latching.pdf}
+\includepdf[pages=-]{./Documents/PDU_SDC.pdf}
+
+\section*{AMS \& IMD latching}
+The latching is achieved with the MC14013BDG flip-flop. It can only be resetted by the AMS reset button in the error state. (the Reset\_Button\_In and Reset\_Button\_Out comes directly from the button located on the side of the car.)
 
 \section*{Current Consumption}
 To calculate the current consumption, the load on the shutdown circuit must first be identified. As seen in the SDC schematic, the load consists of the AIRs, precharge relay, EBS Relay and the Discharge Circuit.
@@ -41,25 +45,28 @@ The current consumption of the components are as follows:
 
 \begin{multicols}{2}
 	\begin{itemize}
-		\item AIRs: \SI{249}{\milli\ampere}
-		\item Precharge relay: \SI{8}{\milli\ampere}
-		\item EBS relay: \SI{9.6}{\milli\ampere}
-		\item Discharge circuit: \SI{4}{\milli\ampere}
+		\item AIRs: \SI{249}{\milli\ampere} \cite{air_datasheet}
+		\item Precharge relay: \SI{8}{\milli\ampere} \cite{precharge_datasheet}
+		\item EBS relay: \SI{9.6}{\milli\ampere} \cite{ebs_datasheet}
+		\item Discharge circuit: \SI{4}{\milli\ampere} \cite{discharge_datasheet}
 	\end{itemize}
 \end{multicols}
 
 We can then find the total consumption when we add all the the load together. $\SI{249}{\milli\ampere} \cdot 2 + \SI{8}{\milli\ampere} + \SI{9.6}{\milli\ampere} + \SI{4}{\milli\ampere} \approx \SI{520}{\milli\ampere}$.
 
 \section*{Overcurrent Protection}
-
+The overcurrent protection is achieved with a physical fuse and a power switch (Infineon PROFET$^{\text{TM}}$ \cite{profet_datasheet}) on our PDU (Power Distribution Unit) PCB. The 3557-15 in the schematic is the fuse-holder for the 1A fuse, and the BTT6050-1ERA is the PROFET$^{\text{TM}}$.
 
 \bibliographystyle{plain}
 
 \renewcommand\refname{Reference}
 \begin{thebibliography}{00}
 
-	\bibitem{ptc_datasheet} \textit{Vishay PTCEL13R251NxE}. \href{https://www.vishay.com/docs/29165/ptcel_series.pdf}{https://www.vishay.com/docs/29165/ptcel\_series.pdf}, 09.2024
-	\bibitem{mosfet_datasheet} \textit{ST STB10LN80K5}. \href{https://www.st.com/resource/en/datasheet/stb10ln80k5.pdf}{https://www.st.com/resource/en/datasheet/stb10ln80k5.pdf}, 02.2016
+	\bibitem{air_datasheet} \textit{TE ECK100BH5AAA}. \href{https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Data+Sheet%7FECK100B_Datasheet%7F3%7Fpdf%7FEnglish%7FENG_DS_ECK100B_Datasheet_3.pdf%7F2071583-1}{https://www.te.com}, 11.2024
+	\bibitem{precharge_datasheet} \textit{Pickering 104-1-A-24/5D}. \href{https://www.pickeringrelay.com/pdfs/104-high-voltage-sil-reed-relays.pdf}{https://www.pickeringrelay.com/pdfs/104-high-voltage-sil-reed-relays.pdf}, 07.2024
+	\bibitem{ebs_datasheet} \textit{Omron G6L1PDC24}. \href{https://media.digikey.com/pdf/Data%20Sheets/Omron%20PDFs/G6L.pdf}{https://media.digikey.com/pdf/Data\%20Sheets/Omron\%20PDFs/G6L.pdf}
+	\bibitem{discharge_datasheet} \textit{WE 140356145200}. \href{https://www.we-online.com/components/products/datasheet/140356145200.pdf}{https://www.we-online.com/components/products/datasheet/140356145200.pdf}, 08.2023
+	\bibitem{profet_datasheet} \textit{Infineon PROFET$^{\text{TM}}$}. \href{https://www.infineon.com/dgdl/Infineon-BTT6050-1ERA-DS-v01_00-EN.pdf?fileId=5546d46269e1c019016a21fa5b7a0d8a}{https://www.infineon.com/dgdl/Infineon-BTT6050-1ERA-DS-v01\_00-EN.pdf?fileId=5546d46269e1c019016a21fa5b7a0d8a}, 03.2019
 
 \end{thebibliography}
 

TS-DC-schematic/Documents/ptc.py

@@ -0,0 +1,57 @@
+import pandas as pd
+import numpy as np
+
+data = pd.read_csv('PTC_LUT.csv', comment='#')
+
+temp = data['Temperature']
+resist = data['Resistance']
+
+volt = 403.2
+dissiFac = 0.0195
+ambTemp = 45
+
+powerLoss = -1
+powerCreate = 0
+i = 0
+
+# Find the zone where the lines intersect
+while powerCreate>powerLoss:
+    powerLoss = (temp[i] - ambTemp)*dissiFac
+    powerCreate = np.square(volt) / resist[i]
+    i = i + 1
+
+# put zone into points to solve for intersection
+p1 = [i-1, (temp[i-1] - ambTemp)*dissiFac]
+p2 = [i, (temp[i] - ambTemp)*dissiFac]
+
+p3 = [i-1, np.square(volt) / resist[i-1]]
+p4 = [i, np.square(volt) / resist[i]]
+
+# Line 1 dy, dx and determinant
+a11 = (p1[1] - p2[1])
+a12 = (p2[0] - p1[0])
+b1 = (p1[0]*p2[1] - p2[0]*p1[1])
+
+# Line 2 dy, dx and determinant
+a21 = (p3[1] - p4[1])
+a22 = (p4[0] - p3[0])
+b2 = (p3[0]*p4[1] - p4[0]*p3[1])
+
+# Construction of the linear system
+# coefficient matrix
+A = np.array([[a11, a12],
+              [a21, a22]])
+
+# right hand side vector
+b = -np.array([b1,
+               b2])
+# solve
+try:
+    intersection_point = np.linalg.solve(A,b)
+    print('Intersection point detected at:', intersection_point)
+    print('Result:')
+    print('Temperature: ', intersection_point[1]/dissiFac+ambTemp)
+    print('Resistance: ', np.square(volt)/intersection_point[1])
+except np.linalg.LinAlgError:
+    print('No single intersection point detected')
+