Carrier reconstruction method for eliminating DC and low-frequency circulating currents in multi-parallel converters
US12374986B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2024 |
| Grant date | Jul 29, 2025 |
| Priority date | — |
| Expiry date | Dec 19, 2044 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/5387
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A carrier reconstruction method to eliminate DC and low-frequency circulating currents in multi-parallel converters is disclosed, addressing the issue of DC and low-frequency circulating currents introduced by traditional carrier phase shift methods. By alternately setting complementary initial phase angles of carriers, this reconstruction method achieves balanced and symmetrical carriers within two periods, thereby eliminating the DC and low-frequency circulating currents caused by asymmetric carriers. The reconstructed carrier method provides a universal solution. It can solve all DC and low-frequency circulating currents issues based on traditional phase-shift carrier modulation strategies. Additionally, the carrier reconstruction method prevents core saturation in common mode inductors or coupled inductors, simplifying the design complexity of these inductors. This disclosure not only reduces inductor size and improves inductor efficiency but also enhances the overall performance of multi-parallel converters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.