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The mechanism of current ripple propagation in a digital controlled LLC converter is investigated from three aspects: battery load, quantization error, and double line frequency perturbation at the input. With conventional frequency modulation (FM), every modulation step is accompanied by quantization error due to limited resolution of digital controllers. Large current ripple is propagated to the...
Multi-coil links are generally introduced to improve the efficiency and extend the energy transmission distance. However, most of them are relay solutions which are equivalent to reduce the distance. In this paper, two kinds of 3-and three kinds of 4-coil links unchanging the energy transmission distance are proposed respectively. Among these links, by comparing the characteristics, the appropriate...
P-type 12-pulse auto-transformer rectifier unit (ATRU) is a very attractive harmonic solution in aviation situation for its lower volt-ampere rating of transformer compared with other multi-pulse methods. However, the input current THD of 12-pulse ATRU is about 15% larger than 10% THD requirement by the related standards. Current-injection method is an effective harmonic mitigation method for 12-pulse...
A model of multi-winding high-voltage transformer is presented, which takes into account effects of leakage transformer, winding resistance and parasitic capacitance. The modeling method and the parameter determination procedure are applicable to all kinds of transformers. Using an LCR meter, all parameters, except the parasitic capacitance, can be determined from taking port impedance measurements...
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