Efficient Voltage Conversion for High Amperage CNC Machines

  • Thread starter Thread starter blakjakd
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SUMMARY

The discussion focuses on efficient voltage conversion for CNC machines powered by 42V supplies. The user requires a method to reduce the voltage to 30V for three stepper motors, each drawing 3A, while the driver board supports a maximum of 36V. A linear regulator for high amperage is unavailable, and using diodes in series is ineffective due to variable current. The recommended solution is to utilize AC/DC converter boards, specifically those that can handle 12-48V input and output 1.5-38V at 5A, available for approximately $9 each.

PREREQUISITES
  • Understanding of CNC machine components and power requirements
  • Knowledge of voltage regulation techniques
  • Familiarity with AC/DC converter specifications
  • Basic electronics skills for implementing voltage conversion solutions
NEXT STEPS
  • Research AC/DC converter boards compatible with high amperage applications
  • Explore linear voltage regulator alternatives for high current scenarios
  • Learn about the implications of using diodes for voltage drop in variable load conditions
  • Investigate the specifications and performance of stepper motor drivers under different voltage inputs
USEFUL FOR

This discussion is beneficial for CNC machine builders, electronics hobbyists, and engineers involved in power management and voltage regulation for 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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