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View Poll Results: What Are You Looking For In A Charger??
High Power Output / Parallel Operation 24 72.73%
Isolated (Narrow Output) 12 36.36%
Non-Isolated 6 18.18%
Wide Output Range 12-400VDC (No Isolation) 21 63.64%
Narrow Range (Built To Suit 1 Voltage Battery Pack 6 18.18%
Digital Controls 27 81.82%
Analog Controls 8 24.24%
Multiple Choice Poll. Voters: 33. You may not vote on this poll

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Old 03-08-2011, 02:28 PM   #21 (permalink)
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[QUOTE=adamj12b;224139]Alright, Here is an update on the charger.



Alright time for some pics.

Untitled by AdamBrunette, on Flickr

QUOTE]
Great job Adam!!!
I love the "potassium" power of the bananas in the background..

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Old 03-08-2011, 02:33 PM   #22 (permalink)
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Quote:
Originally Posted by adamj12b View Post
The driver module for the VLA-500 is basically the same circuit that they offer in the BG2A dev kit. [url]http://www.pwrx.com/pwrx/docs/bg2a_application_note.pdf
I was thinking that you designed your own DC/DC power supply for the driver section.
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Old 03-10-2011, 12:59 AM   #23 (permalink)
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Adam,

Very nice job on the charger. What are you using for a microcontroller? Any chance you will be posting the software code?

Rick
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Old 03-10-2011, 08:34 AM   #24 (permalink)
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Quote:
Originally Posted by steiner View Post
Adam,

Very nice job on the charger. What are you using for a microcontroller? Any chance you will be posting the software code?

Rick
Hello Rick,

Currently the microcontroller is an AVR ATMEGA128A. This is not finalized though and could change on the Alpha boards.

As of right now, the plan is to release the software. Im trying to come up with an open source charger controller and offer kits for people to build their own either with power stage, or they can build their own.

-Adam
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Old 03-20-2011, 09:31 AM   #25 (permalink)
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As Mr Bigh said......Great job Adam!!!

I too love the "potassium" power of the bananas in the background, but isn't
that peanut butter on the right and fluff in the middle?
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Old 03-21-2011, 09:28 AM   #26 (permalink)
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Quote:
Originally Posted by dmills483 View Post
As Mr Bigh said......Great job Adam!!!

I too love the "potassium" power of the bananas in the background, but isn't
that peanut butter on the right and fluff in the middle?
HAHA that is so funny. It really does look like it is. Its not though. Its 2 ceramic pots on the counter.

-Adam
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Old 03-27-2011, 12:33 AM   #27 (permalink)
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Very clean job Adam - like the interface idea!
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Old 03-31-2011, 10:53 AM   #28 (permalink)
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Well I have finished all the changes and updates to the rev2 design show above. I did the layout and ordered the boards on Tuesday. They should be here some time next week! Im so excited. This rev3 version is a totally different layout then the rev2 one. Im really pushing the free version of eagle to the max. In rev 3 I changed how the encoder is interfaced to the AVR, I changed the encoder for the knob interface and replaced the 7805 regulator with a switching regulator circuit which increases efficiency and input voltage range for the logic. I also added hardware over current protection to the PWM output section which should help contain any mishaps. The serial connection has been fully implemented onboard using an FTDI FT232Rl converter chip. This is a virtual com port chip which will be easier to connect to modern computers. That is, if you are not wanting to use the web interface over the ethernet. Other then those, there has only been small changes. Some different parts where I was unhappy with the results of the others.

Here is a screen shot of the board now.
Rev3 Layout by AdamBrunette, on Flickr

And the rev3 schematic.
rev3 Schematic by AdamBrunette, on Flickr

Im sorry to those that dont like surface mount, but there was no way I was fitting all this on a board in through hole. lol. Hopwever, I do plan to offer front panel controllers fully assembled and tested to those interested.

-Adam
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The Following 4 Users Say Thank You to adamj12b For This Useful Post:
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Old 03-31-2011, 03:57 PM   #29 (permalink)
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Quote:
Originally Posted by adamj12b View Post
Im sorry to those that dont like surface mount, but there was no way I was fitting all this on a board in through hole. lol. Hopwever, I do plan to offer front panel controllers fully assembled and tested to those interested.

-Adam
Hey it is not that hard to solder them - even with a regular sharp point Weller iron.. I like to use my nerd goggles (magnifying) to get in close... I have more trouble removing them that way BUT there are tips.... Nice lay out Adam
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Old 04-01-2011, 11:34 AM   #30 (permalink)
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Adam,

Nice work on the PCB. I used to be in the electronics fab industry. If you are going to assemble these for people and the numbers justify it, you may want to consider ordering a stencil and using solder paste. Even hand soldering becomes much easier. I've ordered 100s, so if you wanted help let me know.

Thanks again for the good work,

John K.

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