Efficient Voltage Conversion for High Amperage CNC Machines

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To efficiently reduce a 42V power supply to 30V for a CNC machine with three stepper motors, a high amperage solution is required. Linear regulators are not available for this application, and using diodes in series is ineffective due to varying current demands. A recommended alternative is a step-down voltage regulator module that can handle the necessary voltage and current, such as the AC/DC converter boards available online. These converter boards are designed for a range of voltages and can support up to 5A, making them suitable for the CNC setup. This approach provides a cost-effective and reliable solution for voltage conversion in high amperage applications.
blakjakd
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Hi everyone,

I'm in the process of building a CNC machine. It is controlled by 3 stepper motors controlled by a driver board. Each motor uses 3A, and my board can only handle 36V.

How do I drop my 42V power supply to 30V?
-I can't find a high amperage, 30V linear regulator.
-A bunch of diodes in series to drop the voltage would not work because the current will drop when some motors are not in use.
 
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You could try some of these:

http://www.ebay.com.au/itm/AC-DC-12-48V-1-5-38V-5A-Converter-Board-Step-Down-Voltage-Regulator-Module-/130590702707?pt=AU_B_I_Electrical_Test_Equipment&hash=item1e67cffc73

They are AC/ DC 12-48V to 1.5-38V 5A Converter Boards so that seems to fit in with your voltages.

About $9 each delivered.
 

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