Question: 3.2

Sketch the circuit diagram of the " Flyback" converter switch-mode dc power supply and shortly describe the operation thereof.

Question: 3.3

The average (or dc) output voltage of the flyback circuit in question: 3.2 is Vo = 30V at a resistive load of R = 0.9 Ohm.

The duty-cycle ratio is k = 40% and the switching frequency is f = 900Hz.

The ON-state voltage drops of transistors and diodes are Vt = 0.7V, respectively.

The turns ratio of the transformer is a= Ns/Np = 0.25.

Neglect the losses in the transformer, and the ripple current of the load and determine.

(a) the average input current;

(b) the efficiency;

(c) the average transistor current;

(d) the peak transistor current;

(e) the rms transistor current;

(f) the open-circuit transistor voltage;

(g) the primary magnetizing inductor.

Sketch the circuit diagram of the " Flyback" converter switch-mode dc power supply and shortly describe the operation thereof.

Question: 3.3

The average (or dc) output voltage of the flyback circuit in question: 3.2 is Vo = 30V at a resistive load of R = 0.9 Ohm.

The duty-cycle ratio is k = 40% and the switching frequency is f = 900Hz.

The ON-state voltage drops of transistors and diodes are Vt = 0.7V, respectively.

The turns ratio of the transformer is a= Ns/Np = 0.25.

Neglect the losses in the transformer, and the ripple current of the load and determine.

(a) the average input current;

(b) the efficiency;

(c) the average transistor current;

(d) the peak transistor current;

(e) the rms transistor current;

(f) the open-circuit transistor voltage;

(g) the primary magnetizing inductor.

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