Essay REET 420 Week 6 Complete Work DeVry
REET 420 Week 6 Complete Work DeVry
Week 6 Switching Power Supplies
REET 420 Week 6 Discussion
WEEK 6: THE OPERATION OF AN ALTERNATIVE POWER SYSTEM
Welcome to Week 6! No TED Talk options this week. Questions are below.
Describe the power characteristics of a solar panel.
REET 420 Week 6 Lab Overview
Objectives
- Given a simple SCR circuit, confirm the switching characteristics by simulation.
- Continue to develop expertise with Multisim.
Parts List
Software
- Multisim 11
Introduction
Thyristors are the power horses of semiconductor switches. Thyristors are a broad classification of bipolar-conducting, semiconductor devices that have four (or more) alternating N-P-N-P layers. Thyristors include a silicon-controlled rectifier (SCR), TRIAC, gate turn-off switch (GTO), silicon-controlled switch (SCS), ac diode (DIAC), unijunction transistor (UJT), and programmable unijunction transistor (PUT). Some are specifically designed to work from commercial power lines to control line voltage and deliver thousands of watts of power at over 98% efficiency.
To control the operation of the thyristor, the designer must be able to apply it properly to its application and trigger it accurately, providing the correct amplitude and duration pulse. Adjusting power to the load proportionally by controlling when a thyristor switch turns on takes some special design effort. Before beginning your Lab, download your Lab cover page here (Links to an external site.).
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.
- Enter the thyristor circuit below into Multisim and verify the following.
- If the switch is open, the SCR does not turn on.
- Once turned on, the SCR stays on for the remainder of the cycle.
- The SCR turns off every negative half cycle and must be triggered back on.
- Include in your report an oscilloscope graph showing that (1) when the switch is closed, the SCR fires early in each positive half cycle and stays on for that entire half cycle and that (2) when the line current goes negative, the SCR turns off and stays off for the remainder of that negative half cycle.
Image Description (Links to an external site.)
- Given the circuit shown in the figure below, confirm the performance of the control circuit. Make sure to include oscilloscope graphs in your report.
- Thoroughly explain the performance of the control circuit.
- What must be done to the circuit if the control voltage only goes from 0 to 5 Vdc? Verify your answer by simulation with Vcontrol = 2.5 Vdc.
Image Description (Links to an external site.)
- Describe the SCR, and be sure to use its key parameters.
- Explain the use of snubbers for thyristor circuits. Be sure to include justification for why they are such critical components.
REET 420 Week 6 Assignment
Complete and submit the following assignment: Chapter 7, pp. 374-377, problems 7-1, 7-5, 7-9, 7-13, and 7-19
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