• Corpus ID: 12668416

DC-DC Power Conversions and System Design Considerations for Battery Operated System

@inproceedings{Zhao2005DCDCPC,
  title={DC-DC Power Conversions and System Design Considerations for Battery Operated System},
  author={Lingyin Zhao and Jinrong Qian},
  year={2005}
}

• Lingyin Zhao, J. Qian
• Published 2005
• Engineering

The demand for portable devices such as cellular phones, PDAs, MP3 players and portable DVD players has grown significantly during the last few years. The portable devices usually include a variety of loads including LCD display, memories, mini microprocessor, Universal Series Bus (USB), and a hard disk drive. These loads require different operating voltages and load currents, and are powered by the rechargeable batteries such as Lithium-ion (Li-Ion) batteries, Nickel Metal Hydride (NiMH) batteries and Silver-Zinc batteries through DC-DC converters. Among them, the lithium-ion (Li-Ion) battery is widely-adopted because of its high energy density on both a gravimetric and volumetric basis. To achieve longer system run-time and smaller size, more and more system designers are focusing on improving a system’s power conversion efficiency with advanced circuit topologies through a better understanding of the battery characteristics. This paper first reviews the typical Li-Ion battery discharge characteristics and then discusses five commonly used DC-DC converters in portable power devices. Light load efficiency improvement, output voltage regulation accuracy, battery impedance impact on the system efficiency and system stability are also analyzed in detail.