EB-141 Power Supplies
Innovative Technologies in Education (ITE)
EB-141 Power Supplies
The EB-141 is a single board comprehensive instructional module
designed to teach basic concepts of power supplies to technology
students. The module can be operated as a stand-alone unit or integrated
to the newly developed EB-2000 Computer Managed Laboratory. The
module contains experimental circuits with which the student performs
a number of conceptual experiments at various levels of difficulty.
Manual or computer driver fault-finding exercises and testing are
available when the module is interconnected to the SB- 2000 system,
providing valuable experience in the training and diagnosis of faults.
Test equipment, when used, attaches to the board via 2mm jacks,
placed at various points around the circuits. Students are required
to do only a minimal amount of wiring so training time is maximised.
A comprehensive student manual is provided with each training module.
The manua1 correlates to the exercises to convey concepts relating
to the technologies covered, allowing focus on specific performance
objectives.
Description
The EB-141 module is designed so students will spend the maximum
time on the experiments and practice drills for testing comprehension
and troubleshooting. The module also ensures that students use their
time more efficiently. The printed circuit boards are pre-wired
so that set-up time is minimal. For operation the module is connected
to PUZ-2000. To facilitate the exercises, all the major signals
are brought out on-board with 2mm jacks for tests and interconnections.
The ICs and the transistors are mounted on sockets, enabling easy
replacement. The student has only to plug-in the appropriate patching
cords and shorting plugs in order to perform the recommended experiments.
The boards also come equipped with "black boxes" containing
components used in the fault-finding and practice modes, components
that should not be visually identified by the trainee.
OBJECTIVES
Connect the half wave rectifier circuit.
Use the oscilloscope to determine the input and output waveforms
of the half wave rectifier.
Use the oscilloscope to determine the output voltage waveform with
a capacitative filter.
Determine the value of the ripple voltage.
Complete objectives 1,2,3, and 4 for the full wave rectifier circuit.
Complete objectives 1,2,3, and 4 for the bridge rectifier circuit.
Determine the output voltage waveforms for the Dual Complimentary
Rectifier Circuit.
Determine the effect of loading on the amount of ripple voltage
of rectifier circuits.
Troubleshoot rectifier circuits.
Connect the basic transistor regulator circuit.
Use the oscilloscope to determine the output waveforms of the regulator
circuit.
Determine the output voltage characteristics of the regulator circuit
for different loads.
Determine the characteristics of the regulator circuit that has
feedback and current limiting.
Connect the fixed voltage regulator circuit to an electronic load.
Use the oscilloscope to determine the ripple voltage at the output
of the monolithic regulator circuit.
Measure the DC output voltage for different loads.
Determine the voltage regulation for different loads.
Plot a graph that shows how the voltage regulation changes as load
voltage changes.
Determine how the DC output changes as the load current is changed.
Plot the regulator output voltage characteristic VL-IL curve.
Understand the regulator operation when connected as an electronic
current load.
Use the oscilloscope to obtain the waveform throughout the step-down
switching voltage regulator circuit.
Measure the duty cycle.
Check the influence of frequency on ripple for step-down regulator.
Determine the characteristic output V-I curve of the stpe-down regulator.
Connect the step-up switching voltage regulator from basic circuits.
Obtain the waveforms throughout the step-up switching voltage regulator.
Check influence of frequency on ripple for step-up regulator.
Determine how the output voltage changes as the frequency is changed.
Plot the output VL-IL characteristic curve of the step-up switching
voltage regulator circuit.
Connect the hybrid voltage regulator that consists of the switching
and linear voltage regulators.
Construct the output characteristic VL-IL curve from measured values.
Measure the ripple voltage of the hybrid regulator.
Compare the ripple and output curves of the linear switching and
hybrid regulators.
Identify the test points as a complete circuit.
Measure key voltages in a circuit.
Use the oscilloscope to trace the signal and to observe waveforms
in the different points in the circuit.
Isolate a defective stage.
Locate faulty components.
RECOMMENDED EXPERIMENTS
Unregulated power supplies
Transistor regulator
Monolithic Linear Regulator
Basic Switching Voltage Regulators
Hybrid Voltage Regulator
Troubleshooting voltage regulators circuit
REQUIRED ACCESSORIES
DL-20 Standard set of 2mm Patching Cords and Shorting Plugs
REQUIRED MEASURING EQUIPMENT
20MHZ Dual Trace Oscilloscope
Digital Multimeter 3-1/2 Digits
2.2MHZ AM/FM Function T Generator
MANUAL
Student and instructor manuals, written by pedagogues and electronics
professionals, support every stage of the learning and teaching
process.
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