For Electric Vehicle Team Members Pramit Tamrakar- Electrical Engineering Jimmy Skadal- Electrical Engineering Hao Wang- Electrical Engineering Matthew Schulte- Electrical Engineering Advisor Ayman Fayed Client Adan Cervantes- Element One Systems Team-id- SdMay11-04

Problem Statement  To develop an efficient and safe system for charging and monitoring of multi-cell series batteries in Electric Vehicles by using AC to DC converters.

System Specifications

Functional Decomposition (Hardware)

Functional Decomposition (Software)

Functional Requirement  Li-Ion Battery Management (90 cells in series) Implement a Constant-Current Constant- Voltage (CCCV) charging procedure Battery Gauging Temperature Monitoring Overcharging Protection  Achieve 100 miles range per charge

Non-Functional Requirements  Generating a 324 VDC power bus for battery charging  Designing a circuit capable of generating the 324 VDC power bus form a lower, or a higher voltage source  Ensuring safety

Constraints and Technology considerations Constraints: The charging process Technology: Three Stages Charging Technology Slow charge stage Fast charge stage Constant voltage charging stage Voltage converter Boost converter circuit MSP430 Microcontroller Constraints: High voltage control Technology: Scaling down by a factor about ten

Risk  Electric Shock: The risk of electric shock is possible when working with a charging system.  System Component Damage: As power is being applied and the charging system is running, the risk of overheating, voltage/current spikes, and incorrect connections are possible. Mitigation  Testing and Simulation: To prevent component damage and ensure proper design, the system will be modeled to test for expected results.  Low Volt System: With the 16V – 42V scaled down system, the risk a shock is reduced.  Smart and Safe: By knowing how to be safe and building the system with human/component safety in mind will aid in avoiding risk.

Project Tasks & Schedule

Cost Breakdown

Questions ?