Unfolder-based single-stage AC-AC conversion system

Teeneti, Chakridhar Reddy; Zane, Regan A.; Wang, Hongjie; Yelaverthi, Dorai Babu

Title: Unfolder-based single-stage AC-AC conversion system

Patent · Tue May 09 00:00:00 EDT 2023

OSTI ID:1998367

Teeneti, Chakridhar Reddy; Zane, Regan A.; Wang, Hongjie; Yelaverthi, Dorai Babu

An 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.

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Research Organization:: Utah State Univ., Logan, UT (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: EE0008803

Assignee:: Utah State University (Logan, UT)

Patent Number(s):: 11,646,671

Application Number:: 17/499,735

OSTI ID:: 1998367

Resource Relation:: Patent File Date: 10/12/2021

Country of Publication:: United States

Language:: English

References (16)

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