Patent ID: 11876438
Assignee: INNOMOTICS GMBH
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 4:
5. A method for reducing input harmonic distortion of a power supply, the method comprising:
receiving an input signal representing an input voltage and estimating an input frequency of the input signal, wherein the input signal is a three-phase input signal from a power source, and wherein the power source is a three-phase power source that drives a single-phase load;
receiving an output frequency command and comparing an output frequency with the input frequency;
based at least in part on the comparison, modifying the output frequency to maintain a difference between the input frequency and the output frequency;
receiving an output voltage and current signals, and estimating an output current phase angle with respect to the output voltage;
generating an output voltage command based at least in part on the output frequency and the output current phase angle; and
providing the output voltage command to a controller to generate switching signals,
wherein the output voltage command is a sum of components at the output frequency and at three times the output frequency with a phase delay based at least in part on the output current phase angle,
wherein the single-phase load is insensitive to a distortion in a modified output signal, and
wherein if a value of the comparison is less than a pre-defined limit, the output frequency is adjusted by adding or subtracting the pre-defined limit to the output frequency.