|IP License Number or Name||US11,646,671 B1|
|License Title or Name||Unfolder-based single-stage AC-AC conversion system|
|Brief Description of Technology||
A power converter includes an unfolder connected to a three-phase source and has an output connection with a positive terminal, a negative terminal and a neutral terminal. The unfolder creates two unipolar piece-wise sinusoidal DC voltage waveforms offset by a half of a period. A three-input converter connected to the unfolder produces a quasi-sinusoidal output voltage across output terminals. Switches of the converter selectively connect the positive, negative and neutral inputs across the output terminals. A PWM controller controls a first duty ratio and a second duty ratio for the converter based on a phase angle of the source and a modulation index generated from an error signal related to a control variable. The duty ratios are time varying with a fundamental frequency of the source. The modulation index relates to output voltage of the converter, peak voltage or current of the source and/or peak current at the output terminals.
|Owner Ip||Chakridhar Reddy Teeneti|
|Which project does this pertain to?||Charging Stations|
|Relevant links to online folders with additional materials and/or social media postings||--|
Unfolder-based single-stage AC-AC conversion system