| Summary: | 碩士 === 國立臺北科技大學 === 機電整合研究所 === 96 === The objective of this thesis is to design and implement a phase shift full bridge converter with zero voltage switching. The implemented converter achieves zero voltage transition with a resonant inductor to reduce the switching loss. Moreover, the switching stress and circulating loss are reduced by using the clamping diodes; therefore the overall efficiency is improved. Also the effects of the transformer and resonant inductor are discussed in the thesis. Furthermore, the converter is combined with an AC/DC converter with power factor corrector to achieve universal input voltage.
The specifications of converter are as follows: input voltage equal to DC 400 V, output equal to 48 V/16.62 A (800 W), static load regulation equal to DC 48 V ± 3 % (@Imin = 1 A), dynamic load regulation equal to DC 48 V ± 3 % (@Io = 5 ~ 13.34 A, Io = 8.34 ~ 16.62 A), slew rate equal to 0.5 A/μS, converter efficiency equal to 90% @ 160W; 91% @ 400 W; 92% @ 600 W; 93% @ 800 W.
Experimental results show that the power device can achieve zero voltage turn-on, for the specified input voltage and load conditions. The output voltage is well regulated and varied between 47.5 V and 49.26 V. Moreover, the efficiency for single stage and two stage is 90 % and 80 %, respectively. The results confirm that the designed and implemented converter meets the standard of Energy Star.
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