Soft-switched quasi-single-stage (QSS) bi-directional inverter/charger
Patent 6330170 Issued on December 11, 2001. Estimated Expiration Date: 
August 25, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 25, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod and apparatus for reducing common mode voltage in multi-phase power converters Frequency converter and improved UPS employing the same Patent #: 5896280 InventorsAssigneeApplicationNo. 648114 filed on 08/25/2000US Classes:363/37, By semiconductor rectifier and inverter363/17Bridge typeExaminersPrimary: Wong, Peter S.Assistant: Laxton, Gary L. Attorney, Agent or FirmInternational ClassH02M 005/45AbstractA 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. | |
