Power supply having combined forward converter and flyback action for high efficiency conversion from low to high voltage
Patent 4890210 Issued on December 26, 1989. Estimated Expiration Date: 
November 15, 2008. 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.
November 15, 2008. 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 References 2929982 3381201 3395313 3401272 3828239 Power supply High input voltage DC to DC power converter Over stress sense circuit for flyback power supply Flyback voltage control Rectifier circuit InventorAssigneeApplicationNo. 272006 filed on 11/15/1988US Classes:363/21.11, Having particular pulse-width modulation circuit363/61For rectifyingExaminersPrimary: Salce, Patrick R.Assistant: Sterrett, Jeffrey Attorney, Agent or FirmInternational ClassH02M 003/335AbstractIn a switching power supply including a step-up transformer having primary and secondary windings, wherein in each successive cycle of operation, during a first period of time a voltage pulse is applied across the primary winding for causing forward current in the secondary to flow through a shuttle capacitor and output capacitor connected in series with the secondary winding at this time, for charging the output capacitor to a voltage level approaching the voltage across the series circuit of the shuttle capacitor and secondary winding, and in an immediately following second period of time terminating the voltage pulse across the primary winding, and allowing flyback energy in the secondary winding to charge and be captured only by the shuttle capacitor for transfer to the output capacitor during the next cycle of operation. | |
