This week the team updated the website with revised versions of each of the required documents (Engineering Specs, Proposed Budget, Power Budget, Success Criteria).
For the remainder of the week, John continued construction of the test bed and began a draft report for the team to start working on and Hunter began conducting test simulations for the design of the DC power supply.
The team also meet at the east campus to go over the project, simulations, and preparation for the weekly meeting Professor Notash.
John
John continued construction of the plane wave tube test bed.
The second section was completed on 11/6
Silicone caulking, construction adhesive, and foam-rubber weather stripping were added in order to ensure an airtight seal and minimize structural vibrations.
Construction of a speaker enclosure was completed on 11/7.
Silicone Caulking and weather stripping were added to the box as well.
Cables for power and signal were soldered into the box such that the holes needed could be easily sealed with silicone.
John also created a document for drafting the project report paper.
By making a copy of the report template, the task of adhering to the various formatting guidelines will be greatly simplified.
John finished the abstract on 11/8 and has also drafted a portion of the first chapter.
Hunter
(Week 11)
Following the website and draft updates, the entire progress log was also updated this week in attempt to make it more presentable and easier to use without having to use the PDF viewer.
This was done by downloading PNG images of each slide and modifying the slides to included any links and videos from the original slides. This did however take longer than planned. The number of slides, attached links, and video links were expected to take some time since they needed to be added directly to the webpage, but WiX’s editor can make an easy task a time consuming one due to the amount of lag it can accumulate, which made it difficult to make precise alignments using the snap function, where it would not connect properly at random times, especially as the number of pages and links increased, this issue would increase..
the page has since been completed but it may need to be revised again since the amount of data on the page seems to be slowing it down.
DC Power Supply (LM2596):
The LM2596 Simple Switcher series of regulators are monolithic integrated circuits (which are electronic circuits set on one small flat piece of semiconductor material, usually silicon) and are available in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output voltage ranging of 1.23V to 37V. Each series is also capable of inverting the positive input voltage to a negative output voltage, making it an inverting regulator as well.
Since our project requires the following voltage specifications 3.3V, 5V, +-5V, 12V, and +-18V the LM2956 power converter has the ability of converting and regulating each of these voltages.
For mobility in our design, the DC power supply’s energy source is generated by implementing a battery management system (BMS)for a series of 18650 lithium-ion battery’s that when fully charged provides 16.8V and discharges to 12V before needing to be recharged. This range of 12V to 16.8V provides enough power input for the DC power supply to maintain power throughout the system.
Good efficiency, shown above 70% for each set of fixed values with 3A load.
Texas Instruments (TI) consistently revize their data sheet for the LM2596 series. It includes detailed information and nearly step-by-step instructions consisting of graphs for finding the right component size/rating and selection charts of the components including high quality brand name components, per their recommendation. The images below display an example of the selecting process for inductor L1 and applies to all LM2596 fixed versions 3.3V, 5V, and 12V.
After throughly reading through this, it shows that the only series of LM2596 that technically requires the need of calculations to determine the component values are for the Adjustable (ADJ) version, or if any modifications are made to the original design, like adding a boost converter for example.
Although, good practice would be to do your own calculations which can then be compared with data sheets for confirmation, time permitting.
Initially, an important detail was overlooked and should be noted for this designs devolpmental stage. In Figure 9-7, it can be seen where we made note of how the input voltage for the LM2596-12V series starts at only 14V (being that it is mostly a buck converter) which cannot be used, since it does not satisfy our input specification of 12V-16.8V and drives a load current of 0.6A to 3A max,meaning it would not supply enough power for our 12V output specification. Same goes for the the 18V output spec.
Solution: use the LM2596-ADJ series regulator and apply a boost converter, which will deliver the 12V output specification. We can apply the same booster concept for the 18V output specification as well. This is possible since the ADJ series has a wider input range and is displayed in Figure 9-8 below.
Being that this is Texas Instrument component, it can be simulated in Pspice. However, Pspice can only simulate the 3.3V, 5V, and 12V versions of this regulator since Pspice does not have the LM2596-ADJ I'm their Pspice kit, yet
Again, a boost converter can still be added to the 3.3V, 5V, and 12V series. if for some reason the ADJ version becomes sold out or unatainable, although that would be unlikely unlikely.
The TO-220 has been described as being the preferred choice since it has a larger heatsink, which handles more heat better than the smaller footprint version TO-263.
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