Laser Cutter Power Supply Proposal:

    The exact requirements of the power supply are not known, since we don't have exact data on the diodes.

    The fundamental requirement is that the PSU is capable of 60A at approximately 2 volts.
    I propose initially using 2 point of load modules in parallel, and if the supply needs to be constant current, then adding a current detector and error amplifier to the supply's feedback loops.    Point of load supplies are used to generate high currents for CPU's and in dense (telecom) PCB's.

    The circuit can probably be mounted next to the laser module, limiting the length of the high current conductors.

point of load

   The current sensor was selected because it looks cool.    It is also a one piece unit that provides a voltage output proportional to current.   Isolation, insertion and signal conditioning are handled by the module.   It is hall-effect based.

   Both of the above can be replaced with a component level solution (to reduce cost) once the initial prototypes are made.

The following are possible key components:
Index Quantity Part Number Description Customer Reference Backorder Quantity Unit Price Extended Price
1 4 393-1190-ND CONV DC/DC 12VIN 40A ADJOUT 200W
0 30.84000 $123.36
2 2 620-1322-ND SENSOR CURRENT 150A 5V BI 5-CB
0 7.00000 $14.00
3 2


Subtotal $137.36

Shipping Estimate

Sales Tax unknown

Total unknown

The above is enough for two lasers and can provide up to 5 volts at 80 amps.   There will be a few more small components that should be added to the order.


Component Level Notes:

   A component level solution could be based around something like a:

        LTC3880 - Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

   I will need to look further to determine if the unit can be modified to provide constant current.   Because the FETs are external, this approach can be the basis for some very high current supplies.   Additionally, the supply rail can be higher, further reducing the cable sizes.
   The unit comes in a QFN, which may be a challenge for our assembly techniques.

   A  similar type of device may also be used that might come in a larger package.