Improved EMI noise performance by the reduced input ripple of the Satellite converter

Satellite DC/DC power converters are required to have EMI compatibility as well as high reliability. Since the EMI noise level of the DC/DC converter should be satisfied within the electromagnetic compatibility (EMC) requirement, it is essential to have a large EMI filter in front of it. For fundamentally addressing this problem, the zero-ripple reduction technique has been studied to significantly reduce the ripple on the converter input current, which is the major source of the EMI noise. The active clamp forward with a continuous input current waveform (CACF) converter, which is applied the zero ripple technique on the primary side of the converter, shows greatly reduced input current ripple. In this paper, it is compared that the EMI noise measurement for the CACF converter and the conventional active clamp forward (ACF) converter to confirm the improved EMI noise performance of the CACF converter.