# Title Team Members TA Documents Sponsor
53 Multistage coil gun part 2
Area Award: Teamwork and Collaboration
Alejandro Esteban Otero
Changkun Li
Theodore Culbertson
Jackson Lenz design_document0.pdf
Our project is a continuation of the coil gun project that was started by Jonathan Dagdagan, Shashvat Nanavati, and Yohan Ko in 2013. They were able to build a three stage coilgun and fire it successfully, but the project still had several issues that need to be addressed. To begin with, the SCR cannot handle the voltage put across them during firing. We must find a way to reduce the stress on the SCR, or they will have to be replaced after every firing. We have thought about implementing an isolation transformer to achieve this goal. In order to reduce the current stress of the SCRs we would study the behavior of the circuit when adding SCRs in parallel for each transformer.

To increase the speed of the projectile and prevent the SCRs from blowing up we would include a diode and a resistance in parallel with the coils so that the energy stored in the inductor is dissipated quickly. We also intend to add several features to improve usability, including displays to show the speed of the projectile and charge of the capacitors.

Once the coil gun can be test fired reliably, we will do simulations and collect data to maximize the velocity of the projectile by altering placement of the coils and timing of the triggers.

Low Cost Distributed Battery Management System

Logan Rosenmayer, Daksh Saraf

Low Cost Distributed Battery Management System

Featured Project

Web Board Link:

Block Diagram:

Members: Logan Rosenmayer (Rosenma2), Anthony Chemaly(chemaly2)

The goal of this project is to design a low cost BMS (Battery Management System) system that is flexible and modular. The BMS must ensure safe operation of lithium ion batteries by protecting the batteries from: Over temperature, overcharge, overdischarge, and overcurrent all at the cell level. Additionally, the should provide cell balancing to maintain overall pack capacity. Last a BMS should be track SOC(state of charge) and SOH (state of health) of the overall pack.

To meet these goals, we plan to integrate a MCU into each module that will handle measurements and report to the module below it. This allows for reconfiguration of battery’s, module replacements. Currently major companies that offer stackable BMSs don’t offer single cell modularity, require software adjustments and require sense wires to be ran back to the centralized IC. Our proposed solution will be able to remain in the same price range as other centralized solutions by utilizing mass produced general purpose microcontrollers and opto-isolators. This project carries a mix of hardware and software challenges. The software side will consist of communication protocol design, interrupt/sleep cycles, and power management. Hardware will consist of communication level shifting, MCU selection, battery voltage and current monitoring circuits, DC/DC converter all with low power draws and cost. (uAs and ~$2.50 without mounting)