Ch5 - 98 Chapter 5 Diodes and Selected Applications 5-11...

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Unformatted text preview: 98 Chapter 5 Diodes and Selected Applications 5-11 QUESTIONS AND PROBLEMS 1. Design a power supply using a 24 V, center-tapped transformer to supply 12 V at 500 mA, — 12 V at 100 mA and 5 V at 250 mA. What is the minimum current rating of the transformer? 2. Design a variable voltage power supply which ranges from 5 to 15 V and is capable of supplying 250 mA. 3. In the circuit in Figure A, what would happen if the load resistor were shorted? What would happen if the load resistor were removed? Hint: think in terms of power ratings. kw 1009 12v 4 5.1 V FIGURE A Circuit for problem 3. 4. You have two 120 V AC224 V AC transformers, 16 high-voltage capacitors and 10 high-voltage diodes. Design, on paper, a circuit that maximizes output voltage. What is the maximum voltage of your circuit? 5. What conditions might favor selection of a full—wave rectifier over the bridge rectifier? 6. Design, on paper, a transformerless 300 V power sup— ply with a ripple of 1% or less, capable of supplying up to 100 mA. 7. Determine the necessary values of the components for the circuit of Figure B, with the requirements that the output be 15 V at 100 mV with 0.01 percent or less ripple. 15 V at 100 mA RL (0.01% ripple) FIGURE B Circuit for problems 7 and 8. 8. Repeat the previous problem to achieve an output of 500 V at 10 mA with 0.1 percent or less ripple. 9. The output and ripple expressions for the simple choke filter of Figure C are V _2V, R Dc_w R+Rc and / r = 3.1 X 10'3R/L where RC is the choke resistance. What is the effect upon the ripple of increasing the current? L Full wave rectified signal FIGURE C Circuit for problem 9. 10. A typical power choke, at 10 H, has a resistance of ap- proximately 200 0. Using the equations supplied in the pre— vious problem, and R = 1000 Q, compute the output voltage and the ripple factor of this filter for a power supply with the transformer secondary at 200 V rms. 11. Design a 12V, lOOmA power supply using a Zener diode as a regulator. 12. Sketch the output waveforms expected when a 100 Hz sine wave (5 VP) is applied to each of the circuits in Figure D. 13. Sketch the output waveforms expected when a 100 Hz square wave (10 Vpp) is applied to each of the circuits in Figure D. put of IE choke ‘l‘unthe of ap- PreT oltage ut I the MHZ MHz . u 6.3 V 3.0 V I :50 V D FIGURE D Circuit for problems 12 and 13. Chapter 5 Diodes and Selected Applications ‘99 ...
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