400V – 5A Power Supply For Brushless Motor Drivers

  • Rajkumar Sharma
  • 5804
  • medium
  • Tested

Although the power supply design is specific to the Brushless Servo Drivers mainly for IPM Modules, the concepts and circuit design may be used for any power supply requires high voltage output up to 400V DC and 5 Amps. The power supply is an unregulated design with an option to allow connection to either 120V or 230V mains and also it can work with lower voltage for audio amplifiers by increasing capacitor value. The design uses fully integrated bridge rectifier, and multiple bus capacitors for low ripple, noise suppression, and provides high current reservoirs. Additionally the dc supply line have bleeder resistor R2 and R3 to drain the large reservoir capacitors PCB, mounted fuse holder provided  for short circuit and over current protections, low ohm NTC used for inrush current at power start up,  C1, C12, TX protects  against turn on/off spikes and EMI noise reduction. This power supply can be used to drive Tesla Coils, Induction heaters, DC Motor drivers, Brushless DC motor driver.

Note: Two BOM provided for supply up to 120V AC and BOM 2 for supply input up to 230V AC

Additional precautions must be taken as this power supply uses lethal voltages. Build it only if you know what you are dealing with.


  • AC Supply input up to 120V AC
  • Maximum DC Output 400V DC and 5Amps.
  • 230V AC Input possible with few components value alteration
  • DC Supply Output will depend on input supply
  • Fuse for Short circuit and over current protection
  • Fuse as per your application requirement Maximum 5Amps Fuse
  • NTC provided for inrush current
  • DC Bus has bleeding resistor


Parts List





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