Unregulated Power Supplies Report

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School

Purdue University *

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Course

227

Subject

Electrical Engineering

Date

Feb 20, 2024

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ECET 227 Professor Nawrocki Lab 03 Unregulated Power Supplies 1/23/2024 Objectives The primary objective of this Lab was to investigate output waveforms of half-wave, full- wave center tapped, and full-wave bridge rectifiers. Another objective of this lab was to measure the unloaded and loaded voltage, current, and waveforms from a full-wave bridge rectifier with different various capacitors. Approach and Results 1. Half-wave Rectifier In this procedure a half-wave Rectifier was built using the given schematic shown in FIGURE 1.1 . Oscilloscope probes were placed on the circuit to measure V p , V dc , for channel 2 and V rms for channel 1. Professor R. Nawrocki, Purdue Online Learning System. Purdue ECET Department, Purdue U, January 22, 2024. Web. January 12, 2024 FIGURE 1.1 Half-Wave Rectifier Circuit The load box provided in the lab was set to provide maximum resistance to the circuit. Once the waveforms stabilized the load was lowered to 20 Ω and the data given from the oscilloscope was added to Table 1 . The capture waveform is pictured in FIGURE 1.2 . Table 1 Unregulated Power Supply Performance Page 1 of 6

ECET 227 Professor Nawrocki Lab 03 Unregulated Power Supplies 1/23/2024 V secondary (Vrms) V Load (V p ) V Load Actual (V dc) V Load theory (V dc) Error (%) Half-Wave 27.66 38.8 17.7 25.2 -29.76 Courtesy of Zach Reynolds, Student ECET 227 FIGURE 1.2 Half-Wave Rectifier Output 2. Full-wave Center-tapped Rectifier In this procedure the given circuit as shown in FIGURE 2.1 was constructed and once the proper waveforms were displayed the load box was dropped from full load to 20 Ω. Data was recorded and placed in TABLE 2 and the waveforms are shown in FIGURE 2.2 Page 2 of 6

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ECET 227 Professor Nawrocki Lab 03 Unregulated Power Supplies 1/23/2024 Courtesy of Zach Reynolds, Student ECET 227 FIGURE 2.2 Full-Wave Rectifier Output 3. Full-wave Bridge Rectifier In this procedure the given circuit shown in FIGURE 3.1 was created. Measurements were taken after waveforms stayed steady and the load box was set at 33 Ω. Data was captured in TABLE 3 and the waveforms are shown in FIGURE 3.1. Page 4 of 6

ECET 227 Professor Nawrocki Lab 03 Unregulated Power Supplies 1/23/2024 Professor R. Nawrocki, Purdue Online Learning System. Purdue ECET Department, Purdue U, January 22, 2024. Web. January 12, 2024 FIGURE 3.1 Full-Wave Bridge Rectifier Circuit Table 2 Unregulated Power Supply Performance V secondary (Vrms) V Load (V p ) V Load Actual (V dc) V Load theory (V dc) Error (%) Half-Wave 27.66 38.8 17.7 25.2 -29.76 Full Wave CT 14.43 21.9 13.3 25.2 -47.22 Bridge 35.3 21.9 25.2 -13.09 Courtesy of Zach Reynolds, Student ECET 227 FIGURE 2.2 Full-Wave Bridge Rectifier Output Analysis and Conclusions 1. a. The half-wave rectifier only utilizes one half-cycle of the AC input waveform. This results in a lower average DC output voltage. The full-wave center-tapped rectifier uses Page 5 of 6

ECET 227 Professor Nawrocki Lab 03 Unregulated Power Supplies 1/23/2024 both halves of the AC input waveform by using a center-tapped transformer. It provides a more continuous DC output, increasing the average DC output voltage compared to the half-wave rectifier. The full-wave bridge rectifier uses four diodes in a bridge configuration, allowing it to utilize both halves of the AC input waveform without the need for a center-tapped transformer. This results in a more efficient conversion leading to a higher average DC output voltage. b. A reason of the error shown in load voltages may be due to signal lose of the cheap oscilloscope probes we where using. 2. The relationship between the voltages out of a center-tapped transformer depends on the configuration of the transformer winding and how it is connected. In a center-tapped transformer, there is a secondary winding with a center tap, which divides the winding into two equal halves. Page 6 of 6

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