Práctica 2.docx - INSTITUTO POLITÉCNICO NACIONAL ESCUELA...

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ANALOGUE ELECTRONICS PRACTICE REPORT 2: RECTIFIERS. PROFESSOR: ISMAEL CERVANTES DE ANDA. MEMBERS: CORTEZ TINOCO ALEJANDRO. FONSECA MIRA DANIEL ESTEBAN. RAMOS RAMÍREZ ANTONIO. OBJECTIVE: Analyzed the functioning the rectifiers with diodes. Analyses the behavior of the rectifiers with integration filter. Interpret the values obtained and compare with the theory values. INSTITUTO POLITÉCNICO NACIONAL ESCUELA SUPERIOR DE CÓMPUTO
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Now we come to the most popular application of the diode: rectification . Simply defined, rectification is the conversion of alternating current (AC) to direct current (DC). This involves a device that only allows one-way flow of electrons. As we have seen, this is exactly what a semiconductor diode does. TRANSFORMER. A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction . Electromagnetic induction produces an electromotive force within a conductor which is exposed to time varying magnetic fields . Transformers are used to increase or decrease the alternating voltages in electric power applications. For the first part of the practice, we build a circuit with a transformer and obtain the next results. Our transformer gives 13.3 Volts and the current is 4.65 A For do the practice, we calculated some values, for the transformer, this are the results. We build the circuit and this are the measured values we obtained. MEASURED RESULTS 100 Ω 12.87 V 22 Ω 11.94 V HALF- WAVE RECTIFIER From the theory part, you should know that a pn junction diode conducts current only in 1 direction. In other words, a pn junction diode conducts current only when it is forward biased. The input we give here is an alternating current. This input voltage is stepped down using a transformer. The reduced voltage is fed to the diode ‘D’ and load resistance RL. During the positive half cycles of the input wave, the diode ‘D’ will be forward biased and during the negative half cycles of input wave, the diode ‘D’ will be reverse biased. We take the output across load resistor RL. Since the diode passes current only during one half cycle of the input wave, we get an output as shown in diagram. The output is positive and significant during the positive half cycles of input wave. At the same time output is zero or insignificant during negative half cycles of input wave. For most power applications, half-wave rectification is insufficient for the task. The harmonic content of the rectifier’s output waveform is very large and consequently difficult to filter. Furthermore, the AC power source only supplies power to the load one half every full cycle, meaning that half of its capacity is unused. Half-
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wave rectification is, however, a very simple way to reduce power to a resistive load.
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  • Fall '19
  • Rectifier

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