Systems and methods for efficient three-phase auxiliary power supply for low power applications are disclosed herein. The system includes a capacitor divider circuit that can leverage electromagnetic interference (EMI) filter capacitors utilized in a main power converter. Further, three low voltage capacitors, connected in a star configuration (for a three-phase four-wire input) or a delta connection (for a three-phase three-wire input), can be utilized in the capacitor divider circuit. Additionally or alternatively, multiple high voltage capacitors can be paralleled. The capacitor divider circuit generates a low voltage alternate current (AC) signal that can be converted to a corresponding low voltage direct current (DC) signal by employing a rectifier circuit. Due to the three-phase input, the output DC signal has a very low output ripple voltage.