Parameter that plays a cardinal role in determining the ratings of transformer while designing any power supply is

Q.  Which parameter plays a cardinal role in determining the ratings of transformer while designing any power supply?
- Published on 20 Oct 15

a. Ripple Factor
b. Transformer Utilization Factor (TUF)
c. Peak Inverse Voltage
d. Efficiency

ANSWER: Transformer Utilization Factor (TUF)
 
While designing any regulated or unregulated type of power supply, it is extravagantly essential to estimate the ratings of transformer in terms of Transformer Utilization Factor (TUF).

TUF can be evaluated on the basis of the quantity of power delivered to load as well as the type of rectifier circuit employed by it. Simply, it can be defined as :

TUF = dc power delivered to load / ac rating of transformer secondary

= Pdc / Pac . Rated
It is slightly different from conversion efficiency. Conversion efficiency measures the ratio of output dc power to total amount of input power.

η = Pdc / Pin

Apart from these, peak inverse voltage is the maximum voltage that occurs across the rectifying diode in reverse direction; while ripple factor can be defined in terms of rms value of ac voltage to that of the dc load voltage.

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