Close
0%
0%

OPEN Power

I didn't have enough to buy a Lab Bench PSU... So I made one.

Public Chat
Similar projects worth following
Prototype 1: Simple and Cheap Constant Voltage/ Constant Current Power Supply variable from 0.6V to 12V with led voltage indication. USB Load sharing powered and Lipo backup.

Prototype 2: A Constant Voltage Constant Current Power Supply 0.6V to 12V In addition to an adjustable Negative Rail. Voltage and current Monitoring Provided by a OLED Display.

Prototype 3: Utilizes a Boost Inverting IC to get +-13V and LDO's to Reduce the voltage between 0 and 12V. Both +- Rail Voltage Current and Power will Be displayed on a Full Color LED Display.

The goals of OPEN Power is to produce 3 final Prototypes. All Power Supplies will have USB Charging of Lithium polymer batteries and a Load Sharing and Uninterruptible power when disconnected.

Prototype 1a:

---------------------
Status
(COMPLETED)
Simple Constant voltage Power Supply
Variable from 0.6V to 12V
.
Will Include 5V and 3V Rails.
Voltage indicator will be achieved using
comparators and LED Array.
This was chosen to reduce cost
as much as possible and keep each
board with components under $2.75.



Schematic (LINK)

BOM (LINK)


Prototype 1a: Rendering
Prototype 1a: Rendering
Prototype 1a: Assembled
Prototype 1a: Assembled
Voltage Test
Voltage Test
Load Sharing and Quick disconnect Test
Load Sharing / Uninterruptible Test
Prototype 1b:
---------------------
Status
(Sent To
 the Fab)
Revision 1b The Led arrays are switch
from a linear array to a polar array
around the Voltage and Potentiometer
 trimmers have been added to calibrate.



Prototype 1c:Revision 1b will add an additional 
Constant Current 
Knob to allot
user to limit and see around what
current is being drawn. The Led
arrays are switch from a linear
array to a polar array around the
Voltage and  Current Knob.
 Potentiometer trimmers have been added
to calibrate.

Prototype 2:A Constant Voltage Constant current
Power Supply 0.6V to 12V.
In addition to an adjustable Negative Rail.
Voltage, Current and Power of the
positive Rail will be displayed on
a compact OLED. Negative Rail
Voltage will also Be displayed
as well as the Battery Voltage.

Prototype 3a:
---------------------
Status (COMPLETED)
Utilizes a Boost Inverting IC to get
+-13V and LDO's to Reduce the
Voltage between 0 and 12V.
Both +- Rail Voltage, Current
and Power
will Be displayed
on a Full Color 0.96" LED Display.


(COMPLETED Some errors see Schematic)


Schematic (LINK)
Prototype 3A - Render
Prototype 3A: Rendering
Prototype 3A: Assembled
Prototype 3A: Assembled
Prototype 3A: Load sharing Test
Prototype 3A: Load sharing Test
Prototype 3A: Constant Current Test
Prototype 3A: Constant Current Test
Prototype 3b:
--------------------- 
Status 
(Sent To
the Fab)
Revision 3b will have a DAC Output, 
2 Analog input and 4 DIO Pins
.



                (Sent to the Fab)

Schematic (LINK)
Prototype 3B: Rendering
Prototype 3B: RenderingPrototype 3B: Layout
Prototype 3B: Layout
Prototype 3B: Layout
Prototype 3B: PCB Traces
Prototype 3B: PCB Traces
Prototype 3B: Schematic
Prototype 3B: Schematic

Prototype 3c:Revision 3c will switch from the
Samd21 to the Samd51 for faster
Procecesing power and additional
IOs. The LCD will also be upgraded
 to a 1.3" IPS 240x240 LCD. 
Since the circuit is completely
analog the MCU can perform 
Double duty and Potentially  be
 used as a Crude Oscilloscope
  or Logic Analyzer.

Open Power - Prototype 3B.pdf

OPEN Power - Prototype 3B - Schematic

Adobe Portable Document Format - 816.20 kB - 08/23/2019 at 04:51

Preview
Download

Open Power - Prototype 3A.pdf

OPEN Power - Prototype 3A - Schematic

Adobe Portable Document Format - 715.76 kB - 08/22/2019 at 11:33

Preview
Download

OPEN POWER - Prototype 1A - BOM.pdf

OPEN Power - Prototype 1A - BOM

Adobe Portable Document Format - 44.20 kB - 08/20/2019 at 15:51

Preview
Download

OPEN Power - Prototype 1a - Schematic.pdf

OPEN Power - Prototype 1A - Schematic

Adobe Portable Document Format - 795.88 kB - 08/20/2019 at 15:16

Preview
Download

  • 2 × MT3608 Boost Converter Modified to be a Sepic Boost.
  • 1 × MIC5225-5.0 5V LDO
  • 2 × LED - 0603 - Yellow LED - 0603 - Yellow
  • 2 × LED - 0603 - Orange LED - 0603 - Orange
  • 3 × LED - 0603 - Red LED - 0603 - Red

View all 45 components

View all 10 project logs

Enjoy this project?

Share

Discussions

Martin wrote 4 days ago point

Why do you use a SEPIC converter for 5V? You power it from a LiIon battery (max. 4,2V) and even disconnect the output while charging from USB. A normal step -up would be sufficient, uses less components and has better efficiency.

  Are you sure? yes | no

John Loeffler wrote 4 days ago point

You are absolutely right i will have to change that.  At one pint i was thinking of putting in a Barrel jack for more power options and decided to take it out but didn't change the SEPIC back to a Boost.  Thank you.

  Are you sure? yes | no

Keith Olson wrote 05/03/2019 at 04:34 point

FWIW, Instead of a knob, using 8 jumpers would give you the ability to set 0.1v - 11.9v directly, by using (modified) binary addition.  The major would be set up as 1-2-4-4 (0 - 11) and the minor would be set up as 1-2-2-4 (0 - 9).  For example, a 3.3v setting could be 1100 1100, while a 7.5v could be [1101 1001].  Making one of the major jumpers 8 instead of 4 would allow going up to 16v, and additional major jumpers would allow for even higher voltages.  LED's wouldn't be needed, as the voltage would be visibly displayed.

Does that make sense?

  Are you sure? yes | no

John Loeffler wrote 4 days ago point

That does make sense for accuracy.  I do however prefer to have a continuously adjustable rail for testing some circuits.

  Are you sure? yes | no

Aiden Fang wrote 04/23/2019 at 01:19 point

Wow! Great job! The color scheme looks very attractive. What software did you use to make the drawing?

Thanks!

Aiden

  Are you sure? yes | no

Ubi de Feo wrote 04/21/2019 at 07:06 point

Lots of great work going on here :)

I mostly use breadboards with 6 columns per side, rather than 5, and most of these adapters are useless in this case.

Not long ago I was wondering if there'd be a way to make the power rails adaptable to multiple sizes.

Food for thought, I guess ;)

  Are you sure? yes | no

John Loeffler wrote 04/21/2019 at 10:10 point

do you have a picture I could use for reference?

  Are you sure? yes | no

Arsenijs wrote 04/20/2019 at 17:09 point

Consider using 4-resistor arrays, it might allow you to save a bunch of board space and simplify the BOM.

https://p.globalsources.com/IMAGES/PDT/BIG/251/B1064309251.jpg

  Are you sure? yes | no

John Loeffler wrote 04/20/2019 at 19:33 point

Thank you that is exactly what i need

  Are you sure? yes | no

Jan wrote 04/18/2019 at 20:21 point

Nice idea. The LED thing is a bit over the top though and occupies much board space! 4x LM339?!?!?!
I wonder how you want to route that thing, there is next to no space for traces in the current design. Using 4 layer boards might work though...

  Are you sure? yes | no

John Loeffler wrote 04/19/2019 at 01:16 point

It is routed on a 2layer.  I have gotten pretty good at routing manually over the years.  Check out my prototype 3 it uses an 0.96 color Toft display and has loads more features.

  Are you sure? yes | no

Lukas wrote 04/15/2019 at 08:48 point

Great idea, i need this for my breadboard.

  Are you sure? yes | no

testsubj wrote 04/11/2019 at 18:56 point

There's already some similar boards on Aliexpress that do this. I didn't look for an adjustable version, but the ones that only output 3.3/5 cost less than $1 shipped.

  Are you sure? yes | no

John Loeffler wrote 04/11/2019 at 18:59 point

I love those.  This is usb powered with Lipo backup, as well as continuously adjustable and 5v and 3.3v rails

  Are you sure? yes | no

Dan Maloney wrote 04/11/2019 at 15:12 point

Agreed - great idea. You should really enter this is the Hackaday Prize - this would make a great product!

  Are you sure? yes | no

John Loeffler wrote 04/11/2019 at 15:15 point

Thanks I will,  Check out my Prototype 3.  It has more bells and whistles.  This version is a simple non Micro controller version. Right now the cost of components is less than $4 in low quantity.

  Are you sure? yes | no

Lee Wilkins wrote 04/10/2019 at 20:37 point

Great idea!

  Are you sure? yes | no

Similar Projects

Does this project spark your interest?

Become a member to follow this project and never miss any updates