.net pdf 417

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Diodes and capacitors can be interconnected to deliver a dc output that is approximately twice the positive or negative peak ac input voltage. This is called a voltage-doubler power supply. This circuit works well only when the load draws low current. Otherwise, the voltage regulation is poor; the voltage drops a lot when the current demand is significant. The best way to build a high-voltage power supply is to use a step-up transformer, not a voltagedoubling scheme. Nevertheless, a voltage-doubler power supply can be, and sometimes is, used when the cost of the circuit must be minimized and the demands placed on it are expected to be modest. Figure 21-3 is a simplified diagram of a voltage-doubler power supply. It works on the entire ac cycle, so it is called a full-wave voltage doubler. This circuit subjects the diodes to voltage peaks in the reverse direction that are 2.8 times the applied rms ac voltage. Therefore, the diodes should be rated for PIV of at least 4.2 times the rms ac voltage that appears across the transformer secondary. When the current drawn is low, the dc output voltage of this type of power supply is approximately 2.8 times the rms ac input voltage. Proper operation of a voltage-doubler power supply depends on the ability of the capacitors to hold a charge under maximum load. The capacitors must have large values, as well as be capable of handling high voltages. The capacitors serve two purposes: to boost the voltage and to filter the out-

368 Introduction to semiconductors 7. Of the following, which material allows the lowest forward voltage drop in a diode A. Selenium. B. Silicon. C. Copper. D. Germanium. 8. A CMOS integrated circuit: A. Can only work at low frequencies. B. Is susceptible to damage by static. C. Requires considerable power to function. D. Needs very high voltage. 9. The purpose of doping is to: A. Make the charge carriers move faster. B. Cause holes to flow. C. Give a semiconductor material certain properties. D. Protect devices from damage in case of transients. 10. A semiconductor material is made into N type by: A. Adding an acceptor impurity. B. Adding a donor impurity. C. Injecting electrons. D. Taking electrons away. 11. Which of the following does not result from adding an acceptor impurity A. The material becomes P type. B. Current flows mainly in the form of holes. C. Most of the carriers have positive electric charge. D. The substance has an electron surplus. 12. In a P-type material, electrons are: A. Majority carriers. B. Minority carriers. C. Positively charged. D. Entirely absent. 13. Holes flow from: A. Minus to plus. B. Plus to minus. C. P-type to N-type material. D. N-type to P-type material.

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The concept of modes is sometimes difficult to understand, so let me pass along an analogy that will help. Imagine a shopping mall that has a wide, open central area that all the shops open onto. An announcement comes over the PA system informing people that the mall is now closed;

Quiz 369 14. When a P-N junction does not conduct, it is: A. Reverse biased. B. Forward biased. C. Biased past the breaker voltage. D. In a state of avalanche effect. 15. Holes flow the opposite way from electrons because: A. Charge carriers flow continuously. B. Charge carriers are passed from atom to atom. C. They have the same polarity. D. No! Holes flow in the same direction as electrons. 16. If an electron has a charge of A. A charge of 1 unit. 1 unit, a hole has:

put. The resistors, which have low ohmic values and are connected in series with the diodes, protect the diodes against surge currents that occur when the power supply is first switched on.

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B. No charge. C. A charge of +1 unit. D. A charge that depends on the semiconductor type. 17. When a P-N junction is reverse-biased, the capacitance depends on all of the following except: A. The frequency. B. The width of the depletion region. C. The cross-sectional area of the junction. D. The type of semiconductor material. 18. If the reverse bias exceeds the avalanche voltage in a P-N junction: A. The junction will be destroyed. B. The junction will insulate; no current will flow. C. The junction will conduct current. D. The capacitance will become extremely high. 19. Avalanche voltage is routinely exceeded when a P-N junction acts as a: A. Current rectifier. B. Variable resistor. C. Variable capacitor. D. Voltage regulator. 20. An unimportant factor concerning the frequency at which a P-N junction will work effectively is: A. The type of semiconductor material. B. The cross-sectional area of the junction. C. The reverse current. D. The capacitance with reverse bias.

Most dc-powered devices need something better more pure than the rough, pulsating dc that comes right out of a rectifier circuit. The pulsations (ripple) in the rectifier output can be eliminated by a filter.

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