title : intelligent battery charger supervisor : maeve duffy student : noel walsh
TRANSCRIPT
Title : Intelligent battery charger
Supervisor : Maeve Duffy
Student : Noel Walsh
Introduction• The project was a proposal from the PEP program carried out at
Blue Tree.• The Proposal : Intelligent Back-up Battery charger attached to a Dry
trailer system.• The circuit is expected to :
– Integrate with the R:COM system– Provide an interface to the tractor’s power source (Battery) when the
unit is attached.• The charger circuitry must provide a degree of intelligence to
determine – Is power source attached from tractor unit– Type of battery chemistry in back-up battery– Charging algorithm required for back-up battery– Safe voltage, current and temperature levels.
Introduction
• Variation in chemistries is to allow a choice for their customers based on– Cost – Capacity
• Why Back-up battery is required.
Research
• Battery chemistries: (Initially)– 20Ah Sealed Lead Acid ( 6 cells -> 12v) Panasonic
– 2Ah Lithium Ion (3 cells -> 11.1v) Worley-Parsons
• Battery chemistries: (development)– Nickel Cadmium
• R:COM Power requirements:– Input voltage operates between 11v to 24v (buck converter at input)
– Normal mode -> 2W
– Sleep Mode
Research
• R:COM system is available in USA and Europe– USA tractor unit battery -> 12v
– Europe Tractor unit battery -> 24v
– Switch mode converter required.
• Charging Algorithms:– When to begin a charge cycle
– Monitor process, voltage, current and temperature.
– Finishing a charge cycle
• Hardware Components:– Operating Conditions
– Safety issues
Research
• Software Required– Eagle : Schematic and Layout.
– Pspice : test and simulation.
– Microcontroller development environment.
Project Timetable
Sept Oct Nov Dec Jan Feb Mar Apr
Research
Design Requirements
Simulate/ test
Schematic
Hardware Prototype
Project Timetable
Sept Oct Nov Dec Jan Feb Mar Apr
Firmware
Test Prototype
Production Board
Debug
Test with R:COM system
Project Outline• Research battery chemistries and charging algorithms
– Lead Acid– Lithium-Polymer– Nickel Cadmium
• Outline the requirements and functionality of system.– Power requirements of R:COM system and connections– Monitor Voltage, Current and Temperature– Interface with tractor power source– Monitor back-up battery charge.
• Decide and source hardware components.– Microcontroller– Operating conditions for each part
Project Outline• Analyse and simulate charging algorithms.
– Properties of battery chemistries– Determine when to charge back-up battery, monitor the process and
when to stop.– Simulate with Pspice
• Design Schematic using Eagle.
• Prototype the hardware.– Test design
• Write firmware for microcontroller.– C programming language– Control charging process and monitor V,I and temp.
Project Outline
• Test Prototype for each charging algorithm.• Create production board in eagle layout.• Debug production board.• Test with R:COM system.
Expected Outcomes
• Develop a good understanding of battery re-charging circuits.
• Experience with hardware and software– High level of control required from both elements
• Research and analyse information/data.
• Standard expected for a commercial design.