Welcome to Week 5! No TED Talk options this week. Questions are below. How is a diode switch used in a power circuit?
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REET 420 Week
5 Complete Work DeVry
Week 5 Power
Switches and Thyristors
REET 420 Week 5 Discussion
WEEK 5: DEVICES USED AS POWER SWITCHES
Welcome to Week 5! No TED Talk options this week.
Questions are below.
How is a diode switch used in a power
circuit?
REET 420 Week 5 Lab Overview
Objectives
- Design a buck converter using an LM2595.
Introduction
The buck regulator is the basic circuit
required to convert a high-voltage, dc input to a lower voltage, dc output.
Also known as a step-down regulator, the buck consists of several key power
components, including the transistor switch, the free-wheel diode, and the
output inductor and capacitor. When a buck converter is driven from an ac line
in, it is known as an ac/dc buck converter and is typically preceded in the
circuit by a full-wave rectifier that converts the ac to an unregulated dc that
is input into the buck.
It is crucial to be able to select the major components
of the discrete buck in order to deliver the specified, regulated output
voltage reliably. The voltage regulation is typically handled by an IC
controller, such as the LM2595, which must be properly applied by the designer.
Before beginning your Lab, download your Lab cover page here (Links
to an external site.).
Required Software
This Lab will use the following Lab Resources:
- Virtual Lab – Citrix
Use a personal copy of the software or access the Lab
Resources, go to the Course Resources page – Lab Resources section.
Lab Steps
STEP 1: The Buck Regulator
- Design a buck regulator using an LM2595 to convert an unregulated
input voltage of 15 Vdc to an output of 5 Vdc and then into a 12 Ω resistor. Select and
properly specify all the necessary components, including heat sinks.
Assume that the ambient temperature is 50° C. Show all necessary work for
full credit.
- Be sure to calculate the power and the current that must be
provided to the regulator, the inductor’s inductance and current ratings,
the power that the transistor and the diode must dissipate, and the value
of the output capacitor.
- Once the components have been properly selected, go to a
vendor, such as Digikey, Newark, or Radio Shack, and find the
component part numbers. Change your design, if necessary, to be able to
use components that are readily available.
- Calculate the feedback resistors, power, and current
that must be provided to the LM2585 regulator, the power that the IC must
dissipate, and the junction temperature, assuming that the ambient
temperature is 50° C with no regulator heat sink.
STEP 3: Questions and Discussion
- Explain the operation of the LM2595 buck regulator IC.
- Explain the concept of ripple current and why it
should be minimized in your circuit.
REET 420 Week 5 Assignment
Complete and submit the following assignment:
Chapter 6: pp. 316-319, problems 6-1,
6-4, and 6-8
Chapter 8: p. 433, problems 8-1 and 8-7
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