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small changes (SDC)

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Johnny Hsu 2025-05-05 20:01:24 +02:00
parent 25672d3c94
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2 changed files with 12 additions and 9 deletions
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SDC-schematic/SDC-schematic.pdf
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SDC-schematic/SDC-schematic.tex
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@ -33,22 +33,24 @@
\section*{AMS \& IMD latching}
See: \hyperlink{./Documents/Master_FT25.pdf.8}{AMS Master - SDC Schematic} \\
Latching is achieved using the MC14013BDG flip-flop\cite{flipflop_datasheet}.
The \texttt{SET} inputs of the flip-flops are pulled high by default, opening the SDC.
The signals \texttt{AMS\_OK} and \texttt{IMD\_OK} pull the \texttt{SET} input low.
The \texttt{RESET} input is the only way to reset the flip-flop state and close the SDC.
Latching is achieved using the MC14013BDG flip-flop. \cite{flipflop_datasheet}
The \texttt{SET} inputs of the flip-flops are pulled high by default, opening the SDC.
The signals \texttt{AMS\_OK} and \texttt{IMD\_OK} pull the \texttt{SET} input low.
The \texttt{RESET} input is the only way to reset the flip-flop state and close the SDC.
\\
This signal is driven high in two cases:
This signal is driven high in two cases:
\begin{itemize}{}
\item when the reset button on the side panel is pressed,
\item when the Power-on-Reset is active (which occurs only once, when the AMS Master receives LV supply for the first time).
\item when the reset button on the side panel is pressed,
\item when the Power-on-Reset is active (which occurs only once, when the AMS Master receives LV supply for the first time).
\end{itemize}
Which mean if SDC is opened by the AMS Master because of an error, the only way to close it is by pressing the reset button or by powercycling the car.
Which mean if SDC is opened by the AMS Master because of an error, the only way to close it is by pressing the reset button or by powercycling the LVS.
\section*{Current Consumption}
See: \hyperlink{./Documents/SDC.pdf.1}{SDC Schematic} \\
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.
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.
The current consumption of the components are as follows:
\begin{multicols}{2}
@ -64,6 +66,7 @@ We can then find the total consumption when we add all the the load together. $\
\section*{Overcurrent Protection}
See: \hyperlink{./Documents/FT25_PDU-powerstages-SDC (9A).pdf.1}{PDU - SDC} \\
The overcurrent protection is achieved with a physical fuse and a power switch on our Power Distribution Unit PCB.
The fuse holder is the 3557-15\cite{fuseholder_datasheet}, which holds our 1A fuse, and the powerswitch is the BTT6050-1ERA\cite{profet_datasheet} from Infineon.