William/Senior-Design-Project_WMU-Sunseeker_Altium-Designer
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Adding documentation for power design

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Stephen
2021-04-09 10:43:29 -04:00
parent 2146daacfb
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@@ -255,11 +255,12 @@ In addition to trying to keep the MCU and PCB organized with the left-\/side bei
\end{DoxyItemize}
\end{DoxyItemize}\hypertarget{powerDesign}{}\doxysection{Power Design}\label{powerDesign}
\hypertarget{power_design_autotoc_md15}{}\doxysubsection{Boost}\label{power_design_autotoc_md15}
\hypertarget{power_design_autotoc_md16}{}\doxysubsubsection{LTSpice Simulations}\label{power_design_autotoc_md16}
\hypertarget{power_design_autotoc_md16}{}\doxysubsubsection{Specifications}\label{power_design_autotoc_md16}
The boost converter is used to power the Sunseeker Lighting board. Vin will be the car battery giving a a 12V input. This will then be boosted to 16V output, with an output current of 2A. The lights do not need to turn on, the instant the battery turns on, so including a time may benefit the board.\hypertarget{power_design_autotoc_md17}{}\doxysubsubsection{LTSpice Simulations}\label{power_design_autotoc_md17}
\begin{DoxyItemize}
\item The LTSpice circuit includes input and output resistors for input and output power calculations
\item An RC circuit can be added at the input for time-\/delay for output capacitor charging
\item The LTSpice boost circuit includes input and output resistors for input and output power calculations per Dr. Bazuin. These resistors will not be included in the Altium schematic.
\item Dr. Bazuin suggested that an RC circuit can be added at the input for time-\/delay for output capacitor charging
\item Output power = (16V)(2A(max))=32 Watts
\item Input power = (12V)(Max FET current). Max FET current should be 2-\/3x the desired output current
\item Rsense = Vsense(min)/\+IL(max). Vsense is given in LT1619 Datasheet\+: 40m\+V(min). For IL, we are using max FET current
@@ -267,14 +268,20 @@ In addition to trying to keep the MCU and PCB organized with the left-\/side bei
\item For Rsense, a smaller R value gives less output ripple voltage in simulation.
\item Rsense is basically setting the current through the FET
\end{DoxyItemize}
\item Voltage divider equation can be found in datasheet for LT1619
\end{DoxyItemize}\hypertarget{power_design_autotoc_md17}{}\doxysubsubsection{Altium}\label{power_design_autotoc_md17}
\item Voltage divider equation can be found in datasheet for LT1619\+: Vout=(1.\+24V)(1+(R1/\+R2))
\item Setting the VC resistor effects the oscillation of the output voltage
\end{DoxyItemize}\hypertarget{power_design_autotoc_md18}{}\doxysubsubsection{Altium}\label{power_design_autotoc_md18}
\begin{DoxyItemize}
\item Inductor is 10uH MSS1210-\/103\+MEB. Dr. Bazuin suggested its use as Sunseeker has lots of them
\item Replaced the SI9804\+DY FET (used in LTSpice) with the FDS6680A as the SI is obsolete
\item Replaced the MBR735 Schottky (used in LTSpice) with the MBRD835\+LT4G because 735 is not surface mount
\end{DoxyItemize}\hypertarget{power_design_autotoc_md18}{}\doxysubsection{Buck}\label{power_design_autotoc_md18}
\end{DoxyItemize}\hypertarget{power_design_autotoc_md19}{}\doxysubsection{Buck}\label{power_design_autotoc_md19}
\hypertarget{power_design_autotoc_md20}{}\doxysubsubsection{Specifications}\label{power_design_autotoc_md20}
The DC-\/\+DC buck regulator is a step-\/down converter used to lower the 12V input from the car battery to +3.\+3V to power the telemetry MCU.
The initial buck converter design utilized the\hypertarget{power_design_autotoc_md21}{}\doxysubsubsection{LTSpice Simulations}\label{power_design_autotoc_md21}
\hypertarget{power_design_autotoc_md22}{}\doxysubsubsection{Altium}\label{power_design_autotoc_md22}
{\itshape asd}
{\bfseries{asd}}