Design of Bi-directional CLLC Resonant Converter with Planar Transformer and Synchronous Rectification for Energy Storage Systems

Dhakar, AK and Soni, A and Saini, VK and Chandel, S (2020) Design of Bi-directional CLLC Resonant Converter with Planar Transformer and Synchronous Rectification for Energy Storage Systems. In: IEEE International Conference on Power Electronics and Drives & Energy System (PEDES-2020), December 16-19, 2020, MNIT Jaipur, Rajasthan.

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Abstract

This paper presents the design of a bi-directional CLLC resonant converter for low-voltage energy storage systems (48V) applications. Usually the power destsity for such converters are low due to low switching frequency operation. Thus for first step the swithcing frequency is kept ~300-350 kHz to reduce the size of passives components, which facilitates the usage of planar transformers to enhance power density. Generally the current on LV side is high and to mitigate this a synchronous rectification (SR) scheme is devised. FEA analysis is performed to verify the design of planar transformer for peak flux density, core and copper losses. The SRs and control loop (PI) is implemented via a 32-bit Microcontroller (TMS320F28379D) for CC/CV control in charging mode (CM) and Discharging Mode (DM) respectively. This proof of concept prototype is verfified through a 700W hardware prototype using GaN MOSFETs at high voltage and Silicon MOSFETs at low voltage side; achieving an efficiency of 96.6% in CM and 96.4% In DM.

Item Type:	Conference or Workshop Item (Paper)
Uncontrolled Keywords:	CLLC converter, Energy storage system (ESS), Finite element analysis (FEA), Charging mode (CM), Discharging mode (DM), and Gallium nitride (GaN)
Subjects:	Electronic Systems > Digital Systems
Divisions:	Electronic Systems
Depositing User:	Mr. Jitendra Nath Bajpai
Date Deposited:	10 Sep 2021 11:25
Last Modified:	10 Sep 2021 11:25
URI:	http://ceeri.csircentral.net/id/eprint/561

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