Mars Rover Battery Charger Nick Italiano Alex Fordyce
“Mars” Rover Battery Charger Nick Italiano, Alex Fordyce, Aaron Moldenhauer
INTRODUCTION • Larger project: STELLAr. S • • Middle school program Grows interest in STEM fields Miniature Mars Rover Virtual Mars atmosphere • Problem: the rover needs to recharge!
OBJECTIV ES § § § Wireless charging Fast recharge Cost Efficiency Safety
WIRELESS POWER • Objective: Deliver 48 watts of power wirelessly • Solution: Resonantly Coupled Inductors • Input Restrictions: None • Output Goal: 12 V, 4 A • Output of Current Design: -[PENDING]
POWER ELECTRONICS § Objective: Rectify and convert power § Method: Bridge Rectifier and DC/DC Converter § Input = 12 V + 20% AC § Output = 20 V + 5%, <20 W § Status
CONTROL • Objective: Charge battery fully and safely • Solution: Circuit centered around Battery Management IC • Output Goal: Constant-Current until battery is 8. 4 V and then charge with constant-voltage. • Current Status
CONCLUSIONS § Finish constructing recent revisions § Continue testing § Work on connecting together
Thank You
Wireless Power Math In order to get maximum power transmitted, the Q-factor of the inductor has to be equal to 1/k where k is the coupling coefficient We know the load resistance and can approximate the coupling coefficient. Therefore, we can calculate the inductance value (for matched Q) using… We can choose an resonant frequency, and then choose a capacitance value based on…
Wireless Power Math
Wireless Power Schematic and Plot
Wireless Power Circuit Test Our 250 k. Hz Inverter Output
- Slides: 14