Control Scheme for EMI Reduction via Spread Spectrum Modulation in TCM DCDC Converters - CIPS2020
Channel: Burkhard Ulrich
Date: 2020-06-10

Commented ppt slides of presentation which should be originally shown at the CIPS 2020 - 11th International Conference on Integrated Power Electronics Systems in Berlin in march 2020. https://www.cips.eu/en/2020

Slides available at: 
https://www.researchgate.net/publication/342068164_Control_scheme_for_EMI_reduction_via_spread_spectrum_modulation_for_triangular_current_mode_TCM_DCDC_converters

Article in IEEEXPLORE:
https://ieeexplore.ieee.org/document/9097685

Abstract:
A mixed signal control scheme for DC/DC converters operating with triangular current mode (TCM) is proposed, which leads to a reduction in EMI by simultaneously employing a spread spectrum modulation of the converter switching frequency and maintaining zero voltage switching (ZVS). This is achieved by combining an analog hysteretic current controller with random modulated thresholds generated by a digital voltage controller. By simultaneously changing two switching thresholds, the control scheme also mitigates low frequency oscillations of the output voltage which would be otherwise present. The operation mode is described in detail and validated by measurements on a prototype converter.