Abstract
Ferrite core transformers can be used to generate high voltages (10–30 kV) using the “picture frame” geometry, such as in TV flyback transformers. However, this is not always convenient. Therefore, we have carried out a study of transient high voltage (HV) generation using NiZn and MnZn IEC 3622 pot cores. The transformer coil consisted of a 1 turn primary and a single layer secondary of 120 turns. An SCR switched capacitor discharge circuit was used. The transient secondary voltage, φ vs. t, H vs. t, and φ vs. H were measured for the HV transformer. During primary current excitation, the HV transformer was found to undergo asymmetric ferroresonant oscillations from 0.5 to 1.5 MHz. The hysteresis loss was found to be notably less for the NiZn than for the MnZn ferrites.
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