Unity power factor power supply
Patent 4677366 Issued on June 30, 1987. Estimated Expiration Date: 
May 12, 2006. 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.
May 12, 2006. 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 ReferencesSolid state regulated power transformer with waveform conditioning capability Dual mode DC/DC converter Boost power supply having power factor correction circuit Boost feedforward pulse width modulation regulator Low input voltage precision DC-to-DC voltage converter circuit Patent #: 4542330 InventorsAssigneeApplicationNo. 06/862593 filed on 05/12/1986US Classes:323/222, Using choke and switch across source363/89With transistor control means in the line circuitExaminersPrimary: Salce, Patrick R.Assistant: Hoff, Marc S. Attorney, Agent or FirmInternational ClassesH02M 3/04 (20060101)H02M 3/156 (20060101) H02M 1/00 (20060101) AbstractA unity power factor power supply which includes a boost converter connected to the alternating current line which is controlled to draw sinusoidal current from the line by operating as a current regulator having a current reference control signal which tracks the line voltage waveform, thereby to minimize the required input current for a given power output.Other References
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