2- What are the applications of zener diode?
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- Q1/Consider the circuit in Figure with a transformer of 10:1 transformation ratio and the diodes are silicon. a) What type of circuit is this? (b) What is the total peak secondary voltage? (c) Find the voltage value across the resistor (d) Sketch the voltage waveform across RL (e) What is the PIV for each diode? D3 D 120 V Pisez) Vpouo D D 10 kn lleeeC. In the circuit shown below the knee current for the ideal Zener diode is 10 mA Calculate the minimum value of load resistance RL in order to maintain 5 volts across the load resistance RL 2. WW-How is Zener diode connected into a circuit? What determines the voltage at which a Zener diode break down? What considerations go into determining the power dissipation rating of a Zener diode? Draw a label the schematic symbol used to represent a Zener diode What determines the maximum Zener current of a Zener diode? What is the difference between the maximum Zener current and the reverse current for a Zener diode? What does a positive Zener voltage temperature coefficient signify? What does a negative Zener voltage temperature coefficient signify? How can a Zener diode be temperature compensated?
- 2. Determine the potential across R1. Assume that the zener diode follows a piecewise linear model, with characteristic Zener voltage Vz. Use the simple model for the transistor assuming the usual nominal values. Further, assume that V₁ > V₂. + V1 R2 Q1 NPN D1 Vz R1What are the applications of zener diode? What is zener effect?Q2:- Find the level of Vo for each circuit shown in the Figure below. Also, determine the status of each diode; if it is forward or reverses biasing. Assume all diodes are silicone with 0.7v drop. +5 V +15 V -10 V (12 Marks) R DI +5 VoK D +5 VoK DI -5 VoH -5 Vo4 D2 D2 D2 +5 VoH D3 +5 Vo4 D3 -10 VoK D4 V. -5 Vo K (a) (b)
- 0:- Consider the circuit in Figure a) What type of circuit is this? b) Find and Sketch the voltage waveform across RL, assume the diodes are practical. c) If 100uf capacitor parallel with the resistor, calculate the ripple is connected factor I O o DWhat is a zener diode? Draw the I - V characteristics of a zener diode and explain how it is different from a normal diode?Figure Q2 (b) shows the Zener diode circuit . Given PzM (maximum power) = 40mW. Assume the Zener diode is ideal. Determine: (c) (1) V. (ii) Iz (iii) Pz R=10002 16V Iz Vz 9V 3kn Figure Q2 (b)
- For the network of figure shown below, determine and Sketch V, across the load 120 V is RL resistance R, and determine I, . (assume ideal diodes) Vi 2 k2 3 kn4 -100 VFigure Q2(a) shows the characteristic curve of a Zener diode. Analyse the characteristic curve to identify the approximate minimum Zener current Izk(min) and the approximate Zener voltage, Vz at IZK. -10 -9 -8 -7 -6 -5 -2 -1 Vz (V) + 1 3 4 6 7 8 Iz (mA) Figure Q2(a) Analyse the circuit in Figure Q2(b) to identify the minimum input voltage required to keep the diode in Zener region based on the values of the minimum Zener current and the approximated Zener voltage found in Question 2(a). R 1k2 VIN Figure Q2(b)How can you use a zener diode? Please choose one: a. Voltage reference b. both of the above c. constant current source D. none of the above