Transformer induced instability of the series resonant converter
Abstract
It is shown that the common series resonant power converter is subject to a low frequency oscillation that can lead to the loss of cyclic stability. This oscillation is caused by a low frequency resonant circuit formed by the normal L and C components in series with the magnetizing inductance of the output transformer. Three methods for eliminating this oscillation are presented and analyzed. One of these methods requires a change in the circuit topology during the resonance cycle. This requires a new set of steady state equations which are derived and presented in a normalized form. Experimental results are included which demonstrate the nature of the low frequency oscillation before cyclic stability is lost.
- Publication:
-
IEEE Transactions on Aerospace Electronic Systems
- Pub Date:
- May 1983
- DOI:
- 10.1109/TAES.1983.309329
- Bibcode:
- 1983ITAES..19..474K
- Keywords:
-
- Lc Circuits;
- Power Converters;
- Resonance;
- Systems Stability;
- Transformers;
- Electric Power Supplies;
- Equivalent Circuits;
- Network Synthesis;
- Steady State;
- Waveforms;
- Electronics and Electrical Engineering