Question

Now add Zener diode in the simulation so that Vz=16 V, IZmin =45 mA and IZmax=64 mA; you are allowed to have ripple of up to 450mV;RL is still the same (125 ohms). Provide the details of how you found out the Ri. Provide LTSpice simulation indicating your choice of Ri, Zener Diode, and output Vz of 11 V with ripple of 450mV in the same waveform. Vz=11 V Question 1. Consider the full-wave rectifier circuit in Figure 2.7 of the text. The output resistance is RL​=125 ohms, each diode cut-in voltage is V (gama) =0.7 V, and the frequency of the input signal is 60 Hz. The magnitude of the peak output voltage is to be 15 V (across the load resistance RL​ ).

Answer following: a) Find out Vsecondary (max), Vseondary rms, PIV, capacitance for ripple voltage no more than 0.35 V - (capacitor need to be added in parallel to RL​-remember the frequency of full wave rectifier is higher than half wave rectifier).

Answer 1

Adding a Zener diode to a full-wave rectifier circuit for voltage regulation requires calculating the series resistor (Ri), peak secondary voltage, RMS voltage, PIV, and appropriate capacitance. simulation tools like LTSpice can then be used to model and validate the circuit's performance, confirming the output voltage and ripple parameters are achieved.

Step-by-step explanation:

The process of adding a Zener diode to the full-wave rectifier circuit to achieve a regulated output voltage with a specific ripple involves several calculations and an understanding of electronic components. the Zener diode parameters given are Vz=16 V, IZmin=45 mA, and IZmax=64 mA, with an allowable ripple of up to 450mV and a load resistance, RL, of 125 ohms. to find the series resistor (Ri) necessary to ensure the Zener operates within its specified limits and achieves the desired regulated output voltage we must consider the maximum and minimum current conditions and the peak rectified voltage minus the Zener voltage.

For the rectifier circuit analysis:

• The peak secondary voltage (Vsecondary(max)) must be found to account for diode forward voltage drops and the Zener voltage.
• The root mean square (Vsecondary rms) can then be calculated from Vsecondary(max).
• The Peak Inverse Voltage (PIV) is the maximum voltage each diode must withstand, calculated as twice Vsecondary(max) in a full-wave rectifier.
• The capacitance required to maintain the ripple voltage within specified limits can be derived using the formula for ripple voltage in a full-wave rectified circuit, considering the rectified frequency (twice the input frequency in a full-wave rectifier) and load resistance.

By utilizing simulation tools like LTSpice, one can model the circuit with the chosen Zener diode and resistor values, tuning the resistor to ensure the output voltage Vz remains stable at 11 V with a ripple of no more than 450mV. This simulation validates the theoretical calculations and ensures the design meets the desired specifications.