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The Basic requirements of battery chargers with switching regulators are small sized and high efficiency. High switching frequency is necessary to achieve a small size. However, the switching loss will increase as the switching frequency is increased. This condition, in turn, decreases the efficiency. To solve this problem, some kinds of soft-switching techniques need to be used to operate under high switching frequency. One simple solution to a soft-switching converter is loaded resonant converters. By adopting these topologies, either voltage or current is zero during switching transition, which largely reduce the switching loss and also increase the reliability for the battery charger. It eliminates both low- and high frequency current ripple on the battery, thus maximizing battery life without penalizing the volume of the charger. The proposed work will be LLC resonant converter with closed loop control for battery charger applications.

Closed Loop Control of Full Bridge LLC Resonant Converter for Battery Charging Application