Publikationen

Zero Voltage Switching (ZVS) as applied in the Auxiliary Resonant Commutated Pole Inverter (ARCPI) can reduce drastically the relatively high switching losses of High Voltage IGBT-Modules. Thus the switching frequency can be much higher than in conventional hard switched converters. This paper describes the construction of a scaleable ARCPI-structure. The structure was tested successfully at first in an 80 kVA inverter test-setup, while this paper presents first measurements and experiences with an 1 MVA test-setup with 3.3 kV-IGBTs. Switching frequencies up to 5 kHz were achieved with a rated load current of 800 ARMS.

This paper illustrates the development of an ARCPI with a simple, fully digital control which works on the basis of pre-calculated switching time values stored in a look-up table of a PLD. Although the load current is the only measured input value of the control system there is no need for special driver-stages with a zero-voltage detection possibility. The PLD-control can be easily adjusted to cope with different input parameters and therefore it can be used in full power range without hardware changes. The paper presents the calculation models for the values of the resonant components and the switching times and compares the theoretical results whith the measurements carried out on two different test-setups in the mid and high power range.