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Transformers
Published in Kevin Robinson, Practical Audio Electronics, 2020
Electrical (galvanic) isolation refers to a situation where there is no direct electrical connection between two points in a circuit. As the two sides of a transformer are not directly connected, transformers provide just such an isolation between their primary and secondary sides. This can be desirable on two grounds, firstly as a safety feature limiting the potential for electric shock, and secondly it can provide a means for eliminating noise from a system by interrupting unwanted ground loops.
Bi-directional DC/DC Converters Used in Interfacing ESSs for RESs and EVs: A Review
Published in IETE Technical Review, 2023
Om Prakash Jaga, Ritesh Gupta, Balaram Jena, Sumit GhatakChoudhuri
Isolated, bi-directional DC/DC converter topologies are useful for wide voltage conversion gain and low/medium/high power applications. These types of converters provide galvanic isolation between LV and HV sides. Advantages of galvanic isolation include isolation between sources at different potentials, mitigation of leakage current between RESs and utility mains, personal safety, increase in the operating frequency range of filter, noise reduction and proper operation of the protection system. Various isolated converter topologies have been reviewed for bi-directional power flow. The dual active full-bridge converters are better suited for high voltage and high power applications with wide voltage conversion gain. However, it loses soft-switching (ZVS/ZCS) characteristics during the wide variation in load. Henceforth, in recent trends, resonant converters maintain soft-switching behavior under large load and input voltage changes. Merits of resonant converters include better load voltage regulation, reduction in circulating current, higher voltage and power applications and higher efficiency.