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.
|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.
|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
|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.
|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)
|Revision 3b will have a DAC Output,
2 Analog input and 4 DIO Pins.
(Sent to the Fab)
|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.