AC-DC converter having saw-tooth wave generating circuit in active filter
Patent 5436550 Issued on July 25, 1995. Estimated Expiration Date: 
January 14, 2014. 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.
January 14, 2014. 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 ReferencesCurrent balanced DC-to-DC converter Dual mode DC/DC converter Adaptive compensating ramp generator for current-mode DC/DC converters Current share scheme for parallel operation of power conditioners Drive circuit for zero-voltage switching power converter with controlled power switch turn-on Patent #: 5305191 InventorAssigneeApplicationNo. 182290 filed on 01/14/1994US Classes:323/222, Using choke and switch across source323/266, Including pre or post regulation323/288With ramp generator or controlled capacitor chargingExaminersPrimary: Wong, Peter S.Assistant: Nguyen, Matthew Attorney, Agent or FirmInternational ClassG05F 001/10Foreign Application Priority Data1993-01-22 JPAbstractThis invention provides an AC-DC converter in which the shape and the cost do not increase by a measure for a harmonic distortion in the power factor improved AC-DC converter generating little harmonic distortion. In the AC-DC converter, a control input terminal of a switching transistor of an active filter is connected to an output terminal of a flip-flop, a set input terminal of which is connected to a DC-DC converter to receive a synchronizing pulse signal therefrom. A reset input terminal of the flip-flop is connected to an output terminal of a comparator to receive an OFF-timing signal from the comparator. The comparator determines OFF-timing of the switching transistor by comparing a level voltage with an outout voltage from a saw-tooth wave generating circuit. Thereby since it is not required that an active filter has a multiplier and an an oscillating circuit, its circuit construction is simple and the AC-DC converter in small size and at low cost is realized.Field of SearchUsing choke and switch across sourceZero switching Using a three or more terminal semiconductive device as the final control device Including pre or post regulation Switched (e.g., switching regulators) In flyback path With ramp generator or controlled capacitor charging Having transistorized inverter Bridge type Cooperating separate sensing and control means Including plural sensing or control means With transistor as control means in the line circuit With transistor control means in the line circuit Transistor In transistor inverter systems | |
