| Abstract |
Mobile AC/DC power supplies as being used e.g. for
notebooks face challenging conditions: they should be
compact, lightweight, not get too hot without any forced
cooling, shock proof etc. Due to global usage wide input
voltage range is a must. With increasing power demand of the
processor and additional features of the notebook, output
power increases, thermal management becomes hence an
increasingly difficult task.
The article analyses the losses of its active components and
proposes solutions for the optimization of the system. Due to
large output currents secondary side rectification with active
switches is mandatory. This task is facilitated by half bridge
topologies, which eliminate the need for a control IC for the
secondary side rectification. A further reduction of losses can
be achieved if power factor correction and main stage use
resonant power architectures. |
