Market-research firms anticipate that a combination of 12.1 million pure battery electric vehicles and plug-in hybrids could be on roads worldwide by 2020. Under the hood, intelligent energy management must be applied to vehicle design to meet challenges like viable driving range while running on electric power. Other issues include efficient battery charging (i.e., high power density, high efficiency, and low cost) as well as system compliance with the harsh automotive environment.
This white paper discusses the value of battery-management systems, noting that an intelligent approach with innovative power-stage components is necessary to optimize the performance and lifespan of the vehicle’s battery power source. The paper then reviews the role of the bidirectional DC-DC converters needed to interconnect and transfer energy between different DC voltage buses, which in turn drive various loads in the EV or HEV. Additional information is provided for engineers engaged in the development of EV or plug-in HEV systems.
What You’ll Learn:
- Why energy management is a big issue not only in in EVs, where it is crucial for calculating range, but also in HEVs, where smart system management techniques are essential to higher fuel economy.
- A brief review of the three SAE levels of charging EVs/HEVs
- Functional requirements of the MCUs overseeing and managing various tasks with regard to EV/HEV battery and power subsystems
- How EV/HEV designs handle the two (12 V/48 V) different DC voltage systems
- Why full-bridge and LLC topologies are used in EV applications