Lab3Report

.docx

School

Pennsylvania State University *

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Course

310

Subject

Electrical Engineering

Date

Dec 6, 2023

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docx

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Uploaded by LieutenantTreeCaterpillar25

Moses Tonade EE 310 section 001 Introduction This lab consists of students learning about the transfer of low voltages from AC to DC power and filtering the voltages to be as clean as possible. While in this lab we used power transformers, diodes, Zener diodes, electrolytic capacitors, and a series of resisters. We attempted the design from the board which had us connect a power transformer up to a series of diodes which also had a resistor and a filter capacitor connected in parallel to it. Further along this lab includes the voltage regulator which replaces the resistor and capacitor and attaches onto the circuit like the diagram shown in that section. Circuit Diagram (without Regulator) Figure 1

Moses Tonade EE 310 section 001 The circuit shown in figure 1 represents a full-wave bridge rectifier. This includes the 3-pole power transformer, 2 diodes (1N4004), a 2-watt high powered 150 Ω resistor, and a 450µF capacitor. What this circuit does is it takes the AC voltage wave coming in and transforms the wave to be all positive values. This circuit allows for a smoother transition from AC to DC as it also includes a filter capacitor which in turn allows the output to be cleaner and more precise DC value. Circuit Diagram (without Regulator)

Moses Tonade EE 310 section 001 Suppor ting Analysis This above circuit shows the transformer with the internal resistance of the transformer represented as the Rw and the R1 which is also an Rw. The Rtest is the resistor we inserted to find the Rw values. We calculated the Rtest to be 470Ω. Using the equation ? ac load – ? ac no load 2? test

Moses Tonade EE 310 section 001 We were able to find R w to be around 2.39Ω, From the I test equalling 62.8mA.For the full-wave rectifier to work we needed to calculate the correct peak-inverse-voltage (PIV) which is the maximum voltage the diode the withstand while in the reverse-bias before the breakdown. For our circuit, we calculated the PIV to have a value of 28.2 V. But we also had to account for the peak-to-peak value and not the RMS value, so we had to multiply part of the equation by √2 to get a value of 29.30 V.

Moses Tonade EE 310 section 001 For the third part of this lab, we had to figure out what kind of filter capacitor to use using the equation 𝐶 = ? m 2f𝑅′ ? ? r This is where V m is equal to the peak voltage coming through the rectifier. The frequency is set to the standard 60 Hz. The R’ L is the resistor value in parallel to the capacitor and the V r was found by multiplying the voltage of the capacitor by 0.15. V r came to 1.8v, the capacitor 450 μ F. After finding all those factors we then first measured using the DMM and the oscilloscope the function of the rectifier by itself to see the waveform act the way we expect it to. We then hooked up the oscilloscope to the side ends of the diodes where the power was not coming in from. The graph was shown on the oscilloscope as the following.

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