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An Approach To Optimized Design For Multiphase DC-DC Converter for 48v Mild Hybrid Electric Vehicle
FISITA2016/F2016-THBC-021

Authors

Moon Charles; Choi Yunkyu - 1Infineon Technologies, South Korea
Kim Mike; Chou Wibawa - Infineon Technologies, USA

Abstract

KEYWORDS – 48V DC-DC, 48V Mild Hybrid, MosFET, Optimization, Interleave DC-DC

ABSTRACT

DC-DC converters have been used in high current applications, especially in powering CPU, memory and other peripherals in enterprise power applications. The DC-DC converter is required to have high current, low conversion ratio and high transient response capabilities. In order to achieve these objectives, interleaved multiphase DC-DC converter has been implemented for more than a decade.

In automotive applications, a-48V mild hybrid system requires a bi-directional DC-DC converter that has a few kilowatts of power capability. In principle, the interleaved multiphase DC-DC converter concept can be applied in 48V mild hybrid system. Unlike in an enterprise power application, an automotive 48V DC-DC converter requires a higher voltage rating and a higher reliability. The designers should decide on the proper number of phases and select suitable power devices in order to achieve the target cost and efficiency. This paper demonstrates how choose an optimum number of phases and power semiconductor devices.

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