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High-Power-Density, High-Efficiency DC/DC Converter

Fig. 1. Increasing efficiency and power density in a dc/dc converter.
Efficiency and power density are two driving forces of front-end converters. For the front-end dc-dc converter, determining how to reduce the volume of the passive components and improve efficiency is very critical. Several methods for size reduction of these elements are shown below. To solve the hold-up time issue, this study proposes an LLC resonant converter to replace the PWM converter. An improved design method and an increase in switching frequency are utilized to increase the power density, while improved SR-driven methods are proposed to increase the efficiency. To challenge the limits of power density, magnetic and passive integration is employed, which results in a volume reduction of nearly 40%.
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