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Unfolder-based single-stage AC-AC conversion system

Patent ·
OSTI ID:1998367
; ; ;
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.
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
Country of Publication:
United States
Language:
English

References (8)

Modulation Method and Control Strategy for Full-Bridge-Based Swiss Rectifier to Achieve ZVS Operation and Suppress Low-Order Harmonics of Injected Current journal June 2020
3-Level Asymmetric Full-Bridge Soft-Switched PWM Converter for 3-Phase Unfolding Based Battery Charger Topology conference September 2019
Isolated Bidirectional Grid-Tied Three-Phase AC–DC Power Conversion Using Series-Resonant Converter Modules and a Three-Phase Unfolder journal December 2017
A Direct AC–AC Converter for Inductive Power-Transfer Systems journal February 2012
Novel SWISS Rectifier Modulation Scheme Preventing Input Current Distortions at Sector Boundaries journal July 2017
Triple Active Bridge Series Resonant Converter for three-Phase Unfolding Based Isolated Converters conference October 2019
Swiss rectifier — A novel three-phase buck-type PFC topology for Electric Vehicle battery charging conference February 2012
Unfolder-Based Single-Stage AC-AC Conversion System for Wireless Charging Applications conference October 2020

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