Soft-switched quasi-single-stage (QSS) bi-directional inverter/charger
US6330170A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 2000 |
| Grant date | Dec 11, 2001 |
| Priority date | — |
| Expiry date | Aug 25, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/797
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A soft-switched single-phase quasi-single-stage (QSS) bi-directional inverter/charger converts AC-DC or DC-AC. The inverter/charger comprises a push-pull inverter/rectifier on the dc-side, an isolation transformer which provides ohmic isolation and voltage scaling, two full-bridges on the ac side in cascade, a voltage clamp branch comprising a capacitive energy storage element in series with an active switch with its anti-parallel diode, a passive filter at the ac side to smooth out the high frequency switching voltage ripple at the output, and a corresponding PWM scheme to seamlessly control the converter to operate in all four quadrant operation modes in the output voltage and output current plane, and is capable of converting power in both directions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.