Experiment 5.pdf - Middle East Technical University NCC...

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Middle East Technical University - NCC EEE202 - Circuits Theory II Laboratory 1 EXPERIMENT 5 RECTIFIERS WITH SEMICONDUCTOR JUNCTION AND ZENER DIODES Abstract The characteristics of rectifiers using PN junction and Zener diodes are investigated. Prework on PN Rectifiers 1. Study full wave and half wave rectifiers. a. Find the dc (average) value of a half-wave rectified sinusoid. b. Repeat Part (a) for a full-wave rectified sinusoid, show the derivation steps. CHAPTER 3 of Microelectronic Circuits by SEDRA and SMITH may be HELPFUL 2. Consider two rectifier topologies: a. Consider the half-wave rectifier circuit with a capacitive load and its output given in Fig. 1 for v i (t) = 10 sin (200 t) volts . Figure 1 Assume that the diode is ideal and C = 100 F . It is desired that the peak to peak ripple voltage V r to be less than 1% of the peak output voltage, determine what should be the value of R. (Extra information for this calculation is given at next page.) Using PSpice simulate v o (t) and compute V dc which can be approximated as V dc V V r /2. Do one more simulation for the case that the capacitor is removed. C R v o (t) v i (t) V t t 1 t 2 t 1 +T V r 0 0
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Middle East Technical University - NCC EEE202 - Circuits Theory II Laboratory 2 Extra information: If the time constant is much larger than T, then t 2 t 1 T and since 𝑉 ? (? 2 ) = 𝑉 ∙ ? (𝑡 2 −𝑡 1 ) 𝜏 = 𝑉 ∙ [1 − ? 2 − ? 1 𝜏 + (? 2 − ? 1 ) 2 2! ∙ 𝜏 (? 2 − ? 1 ) 2 3! ∙ 𝜏 … ] It is approximately: 𝑉 ? (? 2 ) ≅ 𝑉 ∙ (1 − 𝑇 𝜏 ) Hence; 𝑉? 𝑉 1 ?𝑅𝐶 b. Repeat Part (a) for the full-wave bridge rectifier circuit with a capacitive load given in Fig. 2. Again assume that the diodes are ideal. (Note that this time V r /V 1/2fRC).
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