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updated the TS-DC-schematic

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Hamza Tamim 2025-05-05 20:56:10 +02:00
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TS-DC-schematic/TS-DC-schematic.pdf
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TS-DC-schematic/TS-DC-schematic.tex
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@ -93,7 +93,7 @@ and the maximum voltage of the accumulator is 403.2V.\cite{emdriver_datasheet} U
\end{wrapfigure}
To calculate how many discharge attempts can be made before the discharge time exceeds \SI{5}{\second},
we first determine the temperature at which the PTC has a resistance of \SI{13123}{\ohm}. This value can be obtained from the PTC's datasheet (see Fig.~\ref{fig:PTC_T_R})~\cite{ptc_datasheet}.
we first determine the temperature at which the PTC has a resistance of \SI{13123}{\ohm}. This value can be obtained from the PTC's datasheet (see Fig.~\ref{fig:PTC_T_R}).\cite{ptc_datasheet}
From the graph, the corresponding temperature is approximately \SI{165}{\celsius}.
We assume the PTC reaches this temperature instantly after each discharge and that heat dissipation is negligible (since the thermal time constant $\tau_{th}$ is \SI{130}{\second}).
@ -124,7 +124,7 @@ Therefore, the number of discharges possible before the discharge time exceeds \
We can find the equilibrium temperature by finding the temperature at which the heat loss is equal to the power emitted.
To find that, we first convert the graph provided in the datasheet (fig. \ref{fig:PTC_T_R}) to a Look Up Table (LUT), a \hyperref[py_script]{python script} is then created
with the two function listed below to find the equilibrium point. \\
($DF$: dissipation factor. For the used PTC: \SI{19.5}{\milli\watt/\kelvin}).
($DF$: dissipation factor. For the PTC used: \SI{19.5}{\milli\watt/\kelvin}).
\begin{align}
(T_{eq} - T_{amb}) \cdot DF = & P_{dissipated} \\
@ -135,14 +135,13 @@ After the execution of the script, we can see that the power dissipation at equi
The equilibrium temperature and the corresponding resistance calculated is then \SI{139}{\celsius} and \SI{88.5}{\kilo\ohm} accordingly.
We can see that this is smaller then the maximum temperature rated at \SI{165}{\celsius}.
To find whether the MOSFET STB10LN80K5 can survive the permanent TS voltage, we first have to calculate the current going through it.
To find whether the MOSFET STB10LN80K5 can survive the permanent TS voltage, we first have to calculate the current going through it. \cite{mosfet_datasheet}
\begin{align}
I & = V/R = \SI{403.2}{\volt}/\SI{88.5}{\kilo\ohm} \\
& = \SI{4.56}{\milli\ampere}
\end{align}
Since the MOSFET drain current $I_D$ is rated for 8A, it will work under permanent TS voltage. \cite{mosfet_datasheet}
Since the MOSFET drain current $I_D$ is rated for 8A, it will work under permanent TS voltage.
\newpage
\section*{Python script}
@ -155,7 +154,7 @@ Since the MOSFET drain current $I_D$ is rated for 8A, it will work under permane
\renewcommand\refname{Reference}
\begin{thebibliography}{00}
\bibitem{emdriver_datasheet} \textit{emDrive HXXX Datasheet}. \href{https://emsisosi.sharepoint.com/sites/EMSISOWebsite/Shared%20Documents/Forms/AllItems.aspx?id=%2Fsites%2FEMSISOWebsite%2FShared%20Documents%2FGeneral%2FemDrive%20Controllers%20web%20data%2FUser%20Manual%2FemDrive%20User%20Manual%5Fv2%5F3%2Epdf&parent=%2Fsites%2FEMSISOWebsite%2FShared%20Documents%2FGeneral%2FemDrive%20Controllers%20web%20data%2FUser%20Manual&p=true&ga=1}{emsisosi.sharepoint.com}
\bibitem{emdriver_datasheet} \textit{emDrive HXXX Datasheet}. \href{https://www.emdrive-mobility.com/portfolio/emdrive-h100/}{www.emdrive-mobility.com}
\bibitem{ptc_datasheet} \textit{Vishay PTCEL13R251NxE Datasheet}. \href{https://www.vishay.com/docs/29165/ptcel_series.pdf}{www.vishay.com}, 09.2024
\bibitem{mosfet_datasheet} \textit{ST STB10LN80K5 Datasheet}. \href{https://www.st.com/resource/en/datasheet/stb10ln80k5.pdf}{www.st.com}, 02.2016