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# Lab 13 - R L-C-v S 120 p r V V RC t RC p V t V e 1 sec 120...

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LABORATORY 13 – Rectifier Circuits Lab Goals In this lab you will learn about the operation of diodes, and characterize half-wave and full- wave rectifier circuits both with and without filtering. You will also learn about Zener diodes and design, construct, and test a simple regulated “power supply.”

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Diode I e - e - e - e - e + p n I O e - p n e - depletion region (a) (b) (c) Figure 13.1 The pn diode, e + + V D -
Simplest electrical model for an ideal diode V D I D Reverse bias Open circuit Forward bias Short circuit Current vs. Voltage plot

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Real diode voltage current characteristics
Common approximation to diode’s V-I characteristics V D V γ D I

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Zener diode I V zener diode -V Z Figure 13.3 The Zener Diode.
Half wave rectifier R L + - Diode conducts only in one direction V 0 V 0 - V γ

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Half wave rectifier with a filter capacitor AC -> DC conversion R L + - C
Estimating the amplitude of the ripple time 60 p r V V RC : 1 sec 60 T = / ( ) t RC p V t V e - : V r

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Full wave rectifier (Bridge Rectifier) R L + - + _
Full wave rectifier (Bridge Rectifier) R L + - + _

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Filter reduces ripple on DC Filter R L + - C
How big a ripple do we now get on the DC?

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Unformatted text preview: R L +-C +-v S 120 p r V V RC : / ( ) t RC p V t V e-: 1 sec 120 T = What does a Zener-diode voltage regulator do? V R C D Z R L V z-+ 1. Provides output voltage independent of the load 2. Output is insensitive to line voltage variation as long as the Zener diode is in “breakdown” mode Keep the Zener diode in breakdown state 2 0.9 1 L z V V R R V γ- <- ÷ min L z R I V ( 29 min 0.9( 2 ) / z I V V V R--∴ V R C D Z R L V z-+ min 0.9( 2 ) C V V V =-Assuming ripple < 10% R limits the current through the Zener diode . / ) 2 ( max I V V V R z--γ max I I < V R C D Z R L V z-+ Diode V Z (V) I max (mA) 1N753A 6.2 60 1N751A 5.1 70 1N749A 4.3 85 1N746A 3.3 110 0.7 V V : Do not kill the Zener diode! Variac (a variable transformer) provides AC power to our rectifier 120V AC @ 60 Hz 0-13 Volts RMS V V RMS 2 RMS V V = Be careful! Electrolytic capacitors have polarity...
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Lab 13 - R L-C-v S 120 p r V V RC t RC p V t V e 1 sec 120...

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