Dynamic Control And EMI Attenuation Techniques of Dual active bridge series resonant converter through large signal modelling (PhD Viva Voce)

Abstract: This work proposes the large-signal model-based control (LSMC) technique of a dual active bridge series resonant converter (DABSRC). It illustrates the design of a multi-variable control system that simultaneously controls both output voltage and reactive power. It also achieves uniform transient response throughout the operating range of the converter. Thereafter, the feedforward technique is also described to achieve the decoupling between the two control loops. It also makes the converter control behave as a first-order system with a similar dynamic response. Thereafter, a uniform frequency dithering technique (FDT) for DABSRC was proposed. The FDT is designed to consider the effect of the mandated resolution bandwidth (RBW) specified by the international standard of CISPR-11. The selection of the switching and dithering frequencies, considering the RBW, is described. Furthermore, a modified LSMC is proposed to mitigate the effect of switching frequency variation on the output variables. Next, a non-uniform FDT is proposed to maximise electromagnetic interference (EMI) attenuation, thereby minimising the EMI input filter size. The uniform FDT does not take into account the effect of the noise floor, which forms the base magnitude of the EMI noise spectrum. The design of the FDT, taking into account the effects of both the noise floor and the mandated RBW, is presented. It experimentally validates the filter size reduction by demonstrating increased EMI attenuation with the proposed non-uniform FDT. The compact phase-shifted full-bridge current doubler rectifier (PSFB-CDR) design for low-voltage gain applications is proposed next. This shows the design of the converter for an auxiliary electric vehicle (EV) battery charger, including the power, control and protection schemes. It achieves the required power density for EV applications due to its compact design. Further, a fast, cost-effective and lossless shoot-through protection scheme for SiC MOSFETs is proposed. It achieves protection by sensing parasitic inductive voltage between the two source legs of a four-leg SiC MOSFET.

Event Details
Title: Dynamic Control And EMI Attenuation Techniques of Dual active bridge series resonant converter through large signal modelling (PhD Viva Voce)
Date: June 12, 2026 at 10:00 AM
Venue: Google Meet (https://meet.google.com/idd-oini-ivf)
Speaker: Mr. Koushik Ghosh (EE21D750)
Guide: Dr. Kamalesh Hatua
Type: PHD seminar