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