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Diode Application in Rectifier Circuits

Extracts from this document...

Introduction

Transfer-Encoding: chunked ELECTRICAL ENGINERING LABORATORY 1 EEE230 EXPERIMENT 5 DIODE APPLICATION ________________ CONTENTS Title Page Introduction/theory PART A:3-4 PART B:9-10 Result PART A:5-6 PART B:11-13 Discussion/Question PART A:7-8 PART B:14 Conclusion 15 References 16 ________________ PART A ; Rectifier circuit using diode Introduction In this experiment, we have learned about the applications of diode. First, we were revising the basic of equipments handling. Secondly. we were knew that one of the main component used in the making of rectifier circuits are diodes and there are three types of rectifier circuits Thirdly, we have been introduced to the function of a capacitor in a rectifier circuit. Lastly, we also have learned about how to build a simple diode clipping and diode clamping circuits Theory Usually we have three main type of rectifier it is a half-wave rectifier circuit, center tap full-wave rectifier circuit and full-wave bridge rectifier circuit. Firstly about half-wave rectifier circuit, when diode was connect to source AC voltage supply, it will be alternately forward-biased, and then reverse-biased, during each cycle of the AC sine-wave. When a single diode is used in a rectifier circuit, current will flow through the circuit only during one-half of the input voltage cycle like in figure below. For this reason, this rectifier circuit is called a half-wave rectifier. The output of a half-wave rectifier circuit is pulsating DC. http://nuclearpowertraining.tpub.com/h1011v1/img/h1011v1_104_1.jpg Second is about center tap full-wave rectifier circuit is uses two diodes connected to the secondary of a center tapped transformer. ...read more.

Middle

The AC riding on the negative end, right end, is shifted down. The positive peak of the wave form is clamped to 0V because the diode conducts on the positive peak. In the negative cycle of the input AC signal, the diode is forward biased and conducts, charging the capacitor to the peak positive value. During the positive cycle, the diode is reverse biased and thus does not conduct. The output voltage is therefore equal to the voltage stored in the capacitor plus the input voltage gain. In the positive cycle of the input AC signal, the diode is forward biased and conducts, charging the capacitor to the peak voltage value. During the negative cycle, the diode is reverse biased and thus does not conduct. The output voltage is therefore equal to the voltage stored in the capacitor plus the input voltage gain, so Vout = negative. A positive biased voltage clamp is identical to an equivalent but with output voltage offset by the bias amount. A negative biased voltage clamp but with the output voltage offset in the negative direction by the bias amount. PART B:Diode clipping and clamping circuit. Theory Diode characteristics From the figure above we can see the diode has a terminal not like the transistor. The negative (-ve) terminal is know as cathode and for positive (+ve) terminal is know as anode. Diode in electrical is a component just allow electricity flow in one direction from anode to cathode. ...read more.

Conclusion

CONCLUSION part A From that experiment we can conclude the diode can change the AC input to the DC output. Because the diode just allows current flow to it just in one direction only. How we know in this experiment we find many type of rectifier such as half-wave rectifier circuit like in figure 5.1, center tap full-wave rectifier circuit like in figure 5.2 and full-wave bride rectifier like in figure 5.3, every circuit are given the different type of output voltage supply and different type of output wave form and this experiment we also get how to use oscilloscope and multimeter better. This experiment we also know with is the best rectifier. And the best rectifier is full-wave rectifier. Part B From both experiment we can conclude the diode can become insulator when in reverse biased and also can be a conductor when in forward biased because that?s time the resistance become low and can make the current easily flow trough diode. In this experiment also we know the how to differentiate the clipping circuit and clamping circuit just look at the circuit for example the clipping circuit the load is in series with the diode and the clamping circuit is the load is parallel with the diode. This experiment we know the clipping and clamping circuit are function to cut the signals peak. ________________ REFERENCE Internet * http://sleepycity.net/troublemakers/diodehttp: * http://www.electronickitsbychaneyelectronics.com * http://penang.i-learn.uitm.edu.my * http://www.scribd.com/ * http://nuclearpowertraining.tpub.com/ * http://metroamp.com/wiki/ * http://www.allaboutcircuits.com Books * Laboratory manual * Fundamentals of electric circuit ...read more.

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