Contemporary architectures for power systems considering future trends

Modern telecommunication systems like mobile phones, internet access nodes or servers demand high reliability, availability and flexibility at low maintenance costs of the supplying electrical power systems. Typically, these systems are fed by DC-bus voltages (27 V, 48 V, 60 V), where DC/DC converters accommodate low voltages (5 V, 3.3 V, 1.1 V...) for modern p-Controllers and DSPs. On the other hand, the number of loads supplied directly by the bus voltage as well as their power consumption decreases simultaneously. Furthermore, new demands like harmonic standards (EN601000-3-2) or new powering configurations including the use of renewable energies require more complex power systems. Due to these major changes, new overall power system architectures should be discussed. This paper presents a comparative study of different architectures based on today´s typical schemes and shows demands and possibilities as well as future trends.