| Abstract |
The optimization of a 3 kW ac-dc boost-converter, operating with an input voltage in the range from 85 V to 264 V is presented. The sinusoidal input current is in accordance with the IEC Harmonic Standard 555-2 and the conducted interference voltages are below the limits of VDE 0871 class B. The various operation modes of this converter topology have been investigated carefully, taking into account a lot of parameters, e.g. switching frequency (constant or modulated), choke current (continuous, discontinuous or mixed mode), filter size, efficiency and so on. The final result of this overall optimization procedure is a circuit consisting of two 1.5 kW modules, operated in parallel with a constant switching frequency of 200 kHz and a phase shift of 180°. |
