Question: 1. 2. The Flyback converter has these specifications: DC input voltage: 40V Output voltage: 25V Duty cycle: 0.5 Rated load: 62.5W Max peak-peak inductor

1. 2. The Flyback converter has these specifications: DC input voltage: 40V Output voltage: 25V Duty cycle: 0.5 Rated load: 62.5W Max peak-peak inductor current ripple: 25% of the average inductor current. Maximum peak-peak output voltage: 0.1V Switching frequency: 75kHz Based on the above mentioned specifications, determine a) Transformer turns ratio b) Value of magnetizing inductor L m. c) Maximum and minimum inductor current. d) Value of capacitor C. The Flyback of Fig. T5a converter has the following circuit parameters: V, = 24V N/N = 3.0 L = 500H R = 50 C=200F f=40kHz V = 5V Determine (a) the required duty ratio D, (b) the average, maximum and minimum values for the current in L and (c) the output voltage ripple. ACT* + Modell with magnetising inductance Figure T5a 3. 4. A Push-pull converter has the following parameters: V = 30V N, IN, = 2 D = 0.3 L = 0.5mH R = 69 C=50F f = 10kHz Determine V, the maximum and minimum values of it, and the output voltage ripple. Design a flyback converter for an input of 24V and an output of 40W at 40V. Specify the transformer turns ratio and magnetizing inductance, the switching frequency and the capacitor to limit the ripple to less than 0.5%.

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