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A project log for Bench power supply

USB and manual control, and monitoring, 2 channel 5A 30V bench supply.

rue-mohrRue Mohr 05/04/2014 at 05:070 Comments

Cant add text from iceweasel, ok. Updates will be few between as I dont get to the computer with chrome on it much.

So far I have a good start on the usb control part of the firmware, I have a working DAC code sample. The DAC I chose, ( PT8211 ) has a 2.5V range centered around 2.5V, so I'v obtained some MCP6002 to expand it to a 0-5V range if I need to. The DAC DOES hold dc values, many people suspected it wouldn't.  I have two tiers to progress, one is to install the avr with a usb conntection isolated on the 5V ttl level. I may post code and images on my website.

After a wait, the P channel mosfets I wanted have come in, 20mR (yay) (IRF4905) so I have set forward designing the power side of the converters. for a converter bucking 32V to the 0.3-30V range, at .1-10A range, it looks like I need a 2mH inductor, I'm not sold on that number, I'm gonn try some things out. 

I bought a component tester (the mega328 based one) from ebay, it worked long enough to give me an idea how neat it would be to have one. I'm left needing to make an inductance measuring setup (my meter dosn't go low enough) which isn't hard with a fet and the scope. 

Tommorow I plan on roughing togethor an open-loop buck converter and trying it out. 

No, converter isn't assembled yet, but I have the new op-amps I wanted. LMC6482. 

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