Efficient management of lead-acid batteries for Micro Hybrid Vehicles
In todays vehicles, the rising number of electrical loads presents a challenge to the battery. More than half of the vehicle breakdowns that are caused by the electrical system can be traced back to the lead-acid battery and could have been avoided by knowledge of the battery state. Additionally, new functions of micro hybrid vehicles like start-stop or intelligent alternator control require exact knowledge of the battery state.
A battery management system (BMS) provides the necessary information by fast and reliable detection of the State-of-Charge (SoC), State-of-Health (SoH) and State-of-Function (SoF) in terms of cranking capability. So, the BMS is able to minimize the number of vehicle breakdowns due to unforeseen battery failure, to maximize lifetime and efficiency of the battery and to enable CO2 saving functions. The key element of the BMS is an Intelligent Battery Sensor (IBS), which measures battery terminal voltage, -current and -temperature and calculates the battery state.
This paper describes the implementation of a BMS using state-of-the-art algorithms for calculation of SoC, SoH and SoF and the efficient implementation of these on Freescales IBS for lead-acid batteries.
Traditionally the charge level of a car battery has been an unknown factor, which in many cases resulted in vehicle breakdowns. Dependent on the vehicle life cycle, battery related failure rates could climb up to 10000 ppm .
Additional challenges to the already critical situation of the car battery are created by the increasing demand of electrical energy and power while CO2 emissions need to be reduced at the same time.
As electronics enable a large part of car innovation, increasing energy supply is required to account for growing functionality in comfort, electrification of safety relevant functions, hybridization of vehicles, driver assistance and infotainment.
On the other side more and more regulations call for reduced CO2 emissions and reduction of fuel consumption.
An advanced energy management system is required in order to manage those opposing requirements. It needs to guarantee that in a wide range of operating scenarios the battery is able to provide enough energy to crank the engine, and that the battery can be used as passive power source, for example to support intelligent alternators and start-stop systems.
- Fast or quick, just be better than slow
- Multirate techniques fuel advances in digital power conversion
- Cranking simulator made easy
- Optimize power for user interfaces through wake-on-approach using capacitive proximity sensing - Part 3
- Extending battery life in transportation and mobile applications with supercapacitors
- Design a cell-monitoring system to optimize accuracy, lower costs, or both
- Selecting FETs for hot-swap source connection
- Optimize battery life for battery powered medical devices and wireless medical devices
- Power supplies for automotive Start /Stop systems
- Basic concepts of linear regulator and switching mode power supplies - Part Two
- Battery lab testing and the limits of the datasheet
- Basic concepts of linear regulator and switching mode power supplies - Part one
- Challenges in power management architectures with internal regulation
- Switcher peak current-mode control circuit optimization for automotive applications
- Add battery back-up power option to existing grid-tied PV and solar systems
- Newswatch: Mediatek v Qualcomm – let the duelling commence
- Newswatch: Tesla sketches out roadmap for the future?
- Simple PS voltage splitters based on audio amplifiers - Part 2
- Tesla targets battery innovation to reduce EV costs
- How to extend a power supply for droop compensation
- What technologies to watch for in 2014? – Part 2
- Pomegranate inspires silicon anode breakthrough for lithium-ion batteries
- Power Tip 68: Pick the right turns ratio for a fly-buck converter
- What destroyed the Hindenburg can ruin your equipment
- Simple PS voltage splitters based on audio amplifiers
- Novel anode breakthrough allows fast charging of next-generation batteries
- Power line communication implementation for DC applications
- Measure small impedances with Rogowski current probes
- IBC solar cell achieves efficiency of 24.4 percent
- Fast or quick, just be better than slow
- ON Semiconductor Hybrid Power Solutions
- High Efficiency, 150V 100mA Synchronous Step-Down Regulator
- High-voltage DC distribution is key to increased system efficiency and renewable-energy opportunities
- Using Next Generation Power Firmware to Simplify Energy Star Compliant Designs
- 3mm Ă— 3mm QFN IC Directly Monitors 0V to 80V Supplies
- Adaptive Cell Converter Topology Enables Constant Efficiency in PFC Applications
- Ultra-compact and innovative - new Schaffner IEC inlet filter series