Electronic Systems: Power Supply

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  • Topic: Soldering, Rectifier, Direct current
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Lab 1 – Power Supplies


Student’s Name

Jorge Zavaleta

ECT246 Electronic Systems III with Lab
Professor’s Name

DeVry University Online

Part A-Power Supplies

TCO #1:
Given an application requiring an AC to DC regulated power supply discuss the block diagram of the supply, and how its internal subsystems are related, using the appropriate data sheets, determine the device’s operating parameters, calculate, simulate and measure the power supply’s electrical parameters.

This week you will build a regulated power supply. Each subsystem - transformer, bridge rectifier, filter and voltage regulator is examined and the voltages and waveforms are analyzed. You will troubleshoot the system for failures and write a short report. CAUTION: You are working near 115V ac voltage. Be very careful and if you have any questions, ask the professor before proceeding.

A. Draw and discuss the subsystems of an ac to dc regulated power supply. a. Draw and label each of the subsystems of a regulated power supply.

b. Describe briefly the purpose of each subsystem.

To protect the current deliver to the electronic device that needs it.

B. Use a bridge rectifier’s data sheet to determine its operating parameters.

c. Using the data sheet for a W04M or similar device, determine and record the pin configuration and maximum operating characteristics.

Package Drawing and Pin Configuration:

Maximum Ratings and Electrical Characteristics:

Peak Repetitive Reverse Voltage (): ___400___

RMS Reverse Voltage (): ____280______

Average Rectified Output Current (): _1.5A______

Forward Voltage (): __1.0V_______

C. Given a full-wave bridge rectifier schematic, calculate the RMS and peak-to-peak output voltage of the transformer’s secondary. Draw and label the time domain output waveform of the transformer’s secondary side. Use the schematic to simulate the circuit. Record the transformer’s primary, secondary voltages and the dc load voltage. Record the input and output waveforms of the bridge. Compare the simulated results to the calculated values.


a. Use the schematic to determine or calculate the following values:

: __200vp_______

: __200v________

: ____200L______

: ___100v_______

b. Draw and label the input and output waveforms of the bridge.

c. In Doc Sharing, use “Select View” and go to Week 1. Download the Multisim PS1.ms Multisim file or create the circuit. Run the simulation and record the following:





d. Use the oscilloscope to view the input and output waveforms of the bridge. Copy and paste the waveforms below.

Explain ripple voltage and how a passive capacitor circuit is used to reduce the effect. Given a full-wave bridge rectifier schematic, calculate the ripple voltage. Simulate the circuit and record the unfiltered and filtered response of the bridge. Compare the results to the calculated values.

a. Explain the cause of ripple voltage and how a capacitor can reduce its effect.

b. Given the following circuit, assuming that Vdc approximately equals Vpk, calculate the expected ripple voltage.


c. From Doc Sharing, week 1 download the Multisim PS2.ms Multisim file or create the circuit. Simulate the circuit without the capacitor connected and record the ripple voltage. Connect the capacitor and repeat the simulation.

: ___120v_______ (without capacitor)

: __200v______ (with capacitor)

d. Describe the effect of the capacitor on the ripple voltage. The capacitor basically its contingency power in case of emergency. When the current needs more voltage, in steed of creating a ripple in the current, the capacitor discharges its energy to avoid it.

E. Discuss the operation of a...
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