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Search: Posts Made By: Burnit0017
Forum: The Projects Forum 08-11-2012, 10:30 PM
Replies: 75
Views: 8,500
Posted By Burnit0017
Hi, concept drawing for OVP for buck converter...

Hi,
concept drawing for OVP for buck converter input.
Forum: The Projects Forum 08-08-2012, 01:02 AM
Replies: 75
Views: 8,500
Posted By Burnit0017
Hi, I do not know if the Zeners will breakdown at...

Hi, I do not know if the Zeners will breakdown at 400 volts. The trigger signal is from the DC side at the bucker input. L1 is from the AC side; single phase; from the PMA. If the SCR fires it will...
Forum: The Projects Forum 08-05-2012, 08:40 PM
Replies: 75
Views: 8,500
Posted By Burnit0017
http://www.wiringdiagrams21.com/2009/11/28/a-typic...

http://www.wiringdiagrams21.com/2009/11/28/a-typical-crowbar-circuit-diagram



Hi, I plan to alter the circuit to include two 200 volt zener diodes in series to replace ZD1. I am not sure if...
Forum: The Projects Forum 08-02-2012, 01:35 AM
Replies: 75
Views: 8,500
Posted By Burnit0017
Hi, to update the reason for this post. It is not...

Hi, to update the reason for this post. It is not about wind turbines, it is about finding or designing a buck converter circuit that will work with a permanent magnet alternator. All PMAs are not...
Forum: The Projects Forum 08-02-2012, 01:00 AM
Replies: 75
Views: 8,500
Posted By Burnit0017
Hi, no disrespect intended but you are wrong. I...

Hi, no disrespect intended but you are wrong. I did perform the experiment you have suggested. I could not illuminate the light without the aid of the buck converter. Thank you for trying to help.
Forum: The Projects Forum 08-01-2012, 08:39 PM
Replies: 12
Views: 1,519
Posted By Burnit0017
Hi, this is the circuit I am using. It only has a...

Hi, this is the circuit I am using. It only has a variable duty cycle, but the same method could be used on the first 555 timer to vary the frequency. Hope this helps.
Forum: The Projects Forum 08-01-2012, 06:23 PM
Replies: 75
Views: 8,500
Posted By Burnit0017
http://www.jameco.com/Jameco/Products/ProdDS/38726...

http://www.jameco.com/Jameco/Products/ProdDS/387268.pdf

Hi, I was checking the data sheet for the inductor I am using and I not sure what I am looking at. There is a column for inductance value...
Forum: The Projects Forum 07-31-2012, 11:09 PM
Replies: 75
Views: 8,500
Posted By Burnit0017
hi, loss not lose. thanks for the edit :)

hi, loss not lose. thanks for the edit :)
Forum: The Projects Forum 07-31-2012, 10:15 PM
Replies: 75
Views: 8,500
Posted By Burnit0017
Hi, the limiting factor of the buck converter is...

Hi, the limiting factor of the buck converter is the inductor. Then I selected all the parts to give the greatest range of operation. Finding a crowbar circuit that will trigger at 400 volts is my...
Forum: The Projects Forum 07-31-2012, 10:09 PM
Replies: 75
Views: 8,500
Posted By Burnit0017
I have verified his result with my prototype...

I have verified his result with my prototype circuit.

this is a video of my prototype circuit
http://www.youtube.com/watch?v=B3dLzZZ5jKQ

The problem I am working on now is a crowbar circuit...
Forum: The Projects Forum 07-31-2012, 07:25 PM
Replies: 75
Views: 8,500
Posted By Burnit0017
Hi, this video can explain the problem better...

Hi, this video can explain the problem better then I can.



http://www.youtube.com/watch?v=0TE38SOdf64

The load will always be experienced. Using a buck converter helps reduce the stator...
Forum: The Projects Forum 07-31-2012, 04:34 PM
Replies: 75
Views: 8,500
Posted By Burnit0017
Hi, I understand what you are saying and the...

Hi, I understand what you are saying and the input is appreciated. The wind turbine is just one application. The faster any PMA spins the more it acts like a electric brake. The problem relates to...
Forum: The Projects Forum 07-31-2012, 02:21 AM
Replies: 75
Views: 8,500
Posted By Burnit0017
Hi, I am not sure what your design looks like....

Hi, I am not sure what your design looks like. This is a photo of the test rig I am using. I had to reduce the RPM’s at the PMA because the drill press RPM range is to high. Maybe it will help give...
Forum: The Projects Forum 07-31-2012, 12:38 AM
Replies: 75
Views: 8,500
Posted By Burnit0017
Hi, approximate measured values: RPM = 280 ...

Hi, approximate measured values:
RPM = 280

Current in = .7 time 3 I can only measure the current at the input of one buck converter, I am using 3 buck converters. Input Current = 2.1 amps DC
...
Forum: The Projects Forum 07-30-2012, 11:54 PM
Replies: 75
Views: 8,500
Posted By Burnit0017
Hi, I found the problem that was causing the test...

Hi, I found the problem that was causing the test values to pulsate. The belt from the drill press was slipping and that was causing the pulsated measured values.
the overload on the drill press...
Forum: The Projects Forum 07-30-2012, 09:47 PM
Replies: 75
Views: 8,500
Posted By Burnit0017
Buck converter for small wind turbine project: update

Hi, the circuit is using a isolated power supply. The Source of the of the mosfet is connected to the ground of isolated power supply. I not sure where to connect the ground lead to measure that...
Forum: The Projects Forum 07-30-2012, 12:52 AM
Replies: 75
Views: 8,500
Posted By Burnit0017
Hi, I am using just the positive tip of the scope...

Hi, I am using just the positive tip of the scope probe to test with. If I test one buck converter or all of them together, the results are the same. Voltage at the input is high with a low current...
Forum: The Projects Forum 07-29-2012, 02:55 PM
Replies: 75
Views: 8,500
Posted By Burnit0017
Question Buck converter, inverted output

Hi, I have question regarding the inverted output of the buck converter when using it to charge a 12 volt battery. The scope shows the output is inverted. The current measured is positive going into...
Forum: The Projects Forum 07-29-2012, 06:49 AM
Replies: 75
Views: 8,500
Posted By Burnit0017
Project update

Hi, tested system using hand crank on the stock F&P. Three out of the four Buck converters are working. With the duty cycle between 30 and 50 % the input voltage stayed at approximately 40 volts DC....
Forum: The Projects Forum 07-27-2012, 04:50 AM
Replies: 75
Views: 8,500
Posted By Burnit0017
Progress is slow. I still have to route...

Progress is slow. I still have to route connections. I included standoffs for plexy-glass safety shields. Once a suitable inductor is found the foot print can be reduced.
Forum: The Projects Forum 07-09-2012, 10:08 PM
Replies: 75
Views: 8,500
Posted By Burnit0017
Hi, I have two possible PMA’s that I can use. One...

Hi, I have two possible PMA’s that I can use. One is a F&P smart drive. The other is one I can fabricate myself. I plan on using the belt drive transmission. The F&P output is about 0.9 volts per...
Forum: The Projects Forum 07-07-2012, 07:30 PM
Replies: 75
Views: 8,500
Posted By Burnit0017
Greetings, yes this one problem that needs to be...

Greetings, yes this one problem that needs to be solved. The other reason I am searching for a solution is if the controller circuit is powered from the PMA side it would turn it self off when there...
Forum: The Projects Forum 07-05-2012, 06:21 PM
Replies: 75
Views: 8,500
Posted By Burnit0017
Buck converter for small wind turbine project: update

Hi, I am limited to what I can fabricate. The largest diameter is 10 inches. I can stack the stators and rotors and connect the stators in parallel to lower the internal resistance and reduce the cut...
Forum: The Projects Forum 07-05-2012, 12:37 PM
Replies: 75
Views: 8,500
Posted By Burnit0017
Buck converter for small wind turbine project: update

Hi, the problem is I will have to add a belt transmission to increase the RPM of the permanent magnet alternator to achieve useable power at average wind speeds. I can fabricate the transmission. If...
Forum: The Projects Forum 07-05-2012, 02:16 AM
Replies: 75
Views: 8,500
Posted By Burnit0017
Question Buck converter for small wind turbine project: update

Greetings, I have made a lot of progress on the wind turbine buck converter project. I have successfully tested a 5 amp buck converter using a 20 kHz controller board with a manually adjustable...
Showing results 1 to 25 of 101

 
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