Abstract:

Abstract: This paper introduces the principle of the half-bridge LLC resonant converter,and analyzes bridge LLC resonant converter dc gain curve. Combined with the current mine lithium iron phosphate,which requirements for high efficiency charger,we designe a high-power LLC lithium iron phosphate battery charger using the UCC25600 controller chip, and use PSIM for simulation. We made an experimental prototype: LLC Power Index is 25.2V/1000W, and it can charge six cells in series iron phosphate lithium battery packs. Experimental results show that LLC mine lithium iron phosphate battery charger has high efficiency, stable output voltage.

Key words: Keywords: LLC resonant converter, Lithium Battery, Battery Charger