ECET210 WEEK 7 HOMEWORK PART 2

ECET210

Week 7 Homework Part II

Problems on Half wave and Full wave rectifiers, Zener Diode applications

Total Points: 15

This is a Regulated DC Power Supply design problem.  The students must choose the values of the following parameters for the design:

a)      V_Out =  6.0 V or 10.0 V or 12.0 V

b)      R_L = ?? Ω    and    R₁ = ?? Ω

c)       Wattage ratings of R₁ and R_L to be determined

d)      I_L = 20 mA;    I_ZD = 20 mA;  I_R1 = ??  mA

e)      Voltage V_{A_DC}  = V_B + 3 V

f)       Turns ratio, n = ??

i)                    Pick an output voltage number from (a)

ii)                   Choose the appropriate Zener Diode from the data sheet given below.

iii)                 Determine the Ω values and the wattage ratings of R₁  and R_L.

iv)                 Determine the peak value of the transformer secondary voltage V_S.

v)                  Determine the transformer turns ratio n.

Assume the following:

a)      Rectifier diode drop = 0.7 V for each. The DC Voltage (after smoothing by the capacitor) is equal to the peak value of the peak value of the full wave rectified pulses.

b)      The Zener voltages are the Nominal Values