1. Electric Superbike Off-Board Charger
Spring 2015-Fall 2015
From Left to Right
Brian Hebbard (ME)
Joe Droleskey (EE)
Christopher Liess (EE)
Tucker Graydon (EE)
Problem Statement:
Most electric vehicles today have their chargers built into the vehicles, but RIT’s Electric Vehicle Team (EVT) has built a superbike to utilize an off board charger to reduce the weight of the vehicle. The goal of this project was to implement a battery charger capable of charging the 12 Kwh lithium ion battery packs in 4 hours or less.
Battery Theory:
Li-Ion batteries must be constantly monitored while charging to prevent the voltage going higher than the safe value. The recommended rate to charge Li-Ion is 1C or lower, thus the charger must be capable of constant communication with each battery cell.
System Layout:
Safety:
SAE J1772 charging standard
Key lock switch on case
Emergency Stop Button
Monitoring system
AC-DC System:
Vienna Rectifer Topology
Convert 120 VAC to 50 VDC
Can be used to convert single, split, or three phase AC
Microcontroller:
Teensy 3.1 ARM based microcontroller
Sources PWM signals to individual stages
The microcontroller communicates to the electric motorcycle over a CAN bus.
Teensy monitors the voltage on the batteries  
DC-DC System:
Buck Converter Topology
Uses Variable PWM to adjust voltage and support heat dissipation
Output stage reduces ripple voltage further with low pass filter
Special Thanks:
To our guide Professor Slack and the Electric Vehicle Team
Results:
System can rectify AC power to DC power and adjust voltage
User interface implemented to control charge levels
Communication from Teensy to battery interfaced