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EETE NOV 2014

POWER SUPLIES Power supply for mobile devices By Michael Mueller and Gerhard Gilch Mobile devices rely on an independent power source. Decisions that are made early on in device development – such as the choice of a suitable battery pack, charging concept, controls for power consumption and power supply dimensions – impact device usability, cost, operation and lifespan. Device function and application provide the guiding principles. Simply put, a power supply system for mobile devices consists of four logic blocks: source, distribution, consumption and charging. Each block has its own intelligence and contains hardware and software. For the success of a device, it is important that the battery lasts a long time, provides sufficient power and is light and small. Next to operating time, weight and size, the most important requirements of a mobile, battery-powered device include safety, durability and unhindered access to international markets. If the power does not come out of the socket, then hopefully it comes from a well-charged battery. A mobile device draws energy from the main power supply or one or more battery packs. The rechargeable battery needs to be small and light, but at the same time provide a lot of energy. Since these two requirements are contradictory, high energy density is at the top of the battery wish list. But where does the energy come from? A battery consists of one or more cells. Different chemical processes are used to build these cells, but when it comes to energy density per cell, lithium-ion technology is far superior to all other chemical cell structures. RRC develops and manufactures rechargeable, extremely high-energy lithium-ion battery packs with cells from Samsung Block diagram illustrating how SBM3, carrier boards and computer module function. Michael Mueller is Sales and Marketing manager for RRC power solutions GmbH - www.rrc-ps.com Gerhard CircularConnAd2-Gilch is EETimesEurope_Project Manager Layout at congatec 1 9/26/14 AG 3:-51 PM Page 1 www.congatec.com Block diagram of the RRC2054 battery. and a microcontroller turn the configuration into a smart battery. An externally connected power manager can retrieve status information and battery-specific data via the SMBus. A data logger records all critical events for evaluation in case of warranty issues or for analysis. The internal battery design determines not only the capacity and performance; it also impacts the subsequent reliability. Batteries from RRC, for example, support authentication, thereby ensuring that the application only uses battery types approved by the equipment manufacturer. Next to the electrical features, the manufacturing quality of the battery pack and the certifica- specialty circular connectors emi filtered & unfiltered and others. The packs are ideal for use in medical, industrial, instrumentation, logistics and military environments. In these markets, quality and safety are of the highest priority, while prices need to be competitive. Intelligent powerhouses To turn a basic cell into a usable, reliable and rechargeable battery with the required performance, battery manufacturers connect several cells in parallel and/or series. Integrated sensors NOW Designed & Manufactured in UK • MIL and Hi-Rel connectors with the industry’s shortest lead times (10-12 weeks, std) • Rapid mate “hot shoe” and mini-MIL circular connectors • Our EMI expertise gives you a better filtered connector • 100% testing of all vital electrical parameters • Broad range of standard ITAR free filtered and unfiltered circular connectors available Call Email Visit +49.9122.795.0 eisSales@apitech.com eis.apitech.com EMI Filters • EMI Filtered Connectors • Ceramic Capacitors • Power Filter Capacitors • Magnetics 34 Electronic Engineering Times Europe November 2014 www.electronics-eetimes.com


EETE NOV 2014
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