AC to DC converter having an enhanced power factor
Patent 5181159 Issued on January 19, 1993. Estimated Expiration Date: 
March 11, 2012. 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.
March 11, 2012. 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 ReferencesUnity power factor power supply Rectifier control apparatus with improved power factor AC to DC converter with unity power factor Patent #: 4940929 InventorsAssigneeApplicationNo. 855111 filed on 03/11/1992US Classes:363/89, With transistor control means in the line circuit323/222, Using choke and switch across source363/46With ripple responsive, automatic controlExaminersPrimary: Stephan, Steven L.Assistant: Berhane, Adolf Attorney, Agent or FirmForeign Patent References
International ClassesH02M 007/217G05F 001/70 G05F 001/613 AbstractThe invention relates to an AC to DC converter having an improved power factor achieved by combining boost converter operation at the beginning and ending of each half wave of the AC input waveform, with passive operation at the middle portion of each half wave. The timing of the operation is based on comparing the instantaneous voltage with a stored average voltage, which has the effect of making boost converter operation go off at a fixed angle after the beginning of each half wave and go on at a fixed angle before the ending of each half wave, the angles being independent of the average AC voltage. The converter increases the power factor to a value between 90 and 97% and reduces the current waveform distortion to between 15 and 29%.Other References
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