Power supply system having improved input power factor
Patent 4831508 Issued on May 16, 1989. Estimated Expiration Date: 
October 20, 2007. 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.
October 20, 2007. 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 ReferencesHigh power factor AC to DC converter circuit D-C Power supply circuit with high power factor Power supply system Low-ripple power rectifier system Switching power supply with automatic power factor correction Patent #: 4683529 InventorAssigneeApplicationNo. 07/111409 filed on 10/20/1987US Classes:363/44, In rectifier systems363/126, Diode363/48, For semiconductor rectifier363/89With transistor control means in the line circuitExaminersPrimary: Wong, Peter S.Attorney, Agent or FirmInternational ClassesH02M 1/00 (20060101)H02M 7/217 (20060101) AbstractA circuit and method using a low frequency active switch for improving input power factor in power supplies utilizing a full wave rectifier and capacitor filter for supplying a filtered DC voltage from an AC power source. A switch control activates and deactivates an active switching once in each half cycle of the alternating voltage input. The switch control is connected to the active switching for operating the circuit providing high power factor. | |
