Transient effects and suppression in a compact 2 kW power factor conditioner with wide input voltage range

This paper describes some specific problems encountered in a 2 kW compact single-phase boost-type power factor conditioner suitable for telecom and navigation applications. Due to the required wide input voltage range (from 170 V to 300 V), a high nominal DC output voltage of 450 V is required. This high voltage requirement puts considerable constraints on the choice of power components. Transient effects such as excessive diode reverse-recovery current and induced voltage spikes are also observed in the compact system in which power electronics are kept close to the low voltage control electronics. Measures have been developed to suppress these transient effects to satisfactory levels. Experimental results with and without such measures are included and discussed