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n a typical half bridge LLC resonant converter with a Centre tap transformer, has a turns ratio of 3:1:1 with input dc voltage is kept at 400V.   If the output voltage is to be maintained at 50V @ 500W Max. If the Q-factor is kept at 0.3 and the resonant frequency is kept at 50kHz. The required value of the resonant inductor is :Select one:a. 0.464 Micro Henryb. 46.4 Micro Henryc. None of the given choicesd. 4.64 Micro Henry

Question

n a typical half bridge LLC resonant converter with a Centre tap transformer, has a turns ratio of 3:1:1 with input dc voltage is kept at 400V.   If the output voltage is to be maintained at 50V @ 500W Max. If the Q-factor is kept at 0.3 and the resonant frequency is kept at 50kHz. The required value of the resonant inductor is :Select one:a. 0.464 Micro Henryb. 46.4 Micro Henryc. None of the given choicesd. 4.64 Micro Henry

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Solution

The question is asking for the value of the resonant inductor in a half bridge LLC resonant converter.

Given:

  • Turns ratio = 3:1:1
  • Input DC voltage = 400V
  • Output voltage = 50V
  • Power = 500W
  • Q-factor = 0.3
  • Resonant frequency = 50kHz

The resonant inductor (Lr) in a LLC resonant converter can be calculated using the formula:

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