Energy Conversion—Power Supplies (original) (raw)

Engineering Embedded Systems, 2014

Abstract

The power supply circuits in an embedded system convert the electrical energy provided by some source like a battery into electrical energy according to the demand of the rest of the system. Logic and analog circuitry requires a well-regulated constant voltage but some applications, such as driving high-power light-emitting diodes, ask for a precisely regulated current. Energy efficient power supplies can often do without extra heat sinks, allowing for the design of small and lightweight devices. In battery operated devices the energy efficiency of the supply circuits translates directly into longer service time between charges. A large part of the success of battery operated devices in the last decade can be attributed mainly to the increased energy efficiency of the electronics and of the supply circuits in particular and to a lesser degree to increases in the capacity of batteries.

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