Non-linear carrier controllers for high power factor rectification
Patent 5867379 Issued on February 2, 1999. Estimated Expiration Date: 
February 2, 2016. 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.
February 2, 2016. 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 3659184 AC to DC power converter with input current waveform control for buck-boost regualtion of output Indirect current sensing of DC to DC converters Power factor improvement Power supply with improved power factor correction Pulse width modulated DC/DC converter with reduced ripple current coponent stress and zero voltage switching capability Patent #: 5291382 InventorsAssigneeApplicationNo. 371822 filed on 01/12/1995US Classes:363/89, With transistor control means in the line circuit323/222Using choke and switch across sourceExaminersPrimary: Wong, Peter S.Assistant: Patel, Rajnikant B. Attorney, Agent or FirmInternational ClassesG05F 001/46H02P 013/00 AbstractThis patent disclosure describes new non-linear carrier-pulse-width modulators for control of high power-factor boost rectifiers. In the new modulators, the switch duty ratio is determined by comparing a signal derived from the main switch current with a periodic, nonlinear carrier signal νc (t, νm). The shape of the carrier is selected so that the resulting input current follows the input voltage, as required for unity-power-factor rectification. A slowly-varying modulating input νm can be used to adjust the power level and to regulate the output dc voltage. The controller based on the new non-linear-carrier modulator has a number of advantageous properties: sensing of the input line voltage is eliminated; for current shaping, only sensing of the power switch current is needed; current shaping does not require an error amplifier with feedback loop compensation; the multiplier in the voltage feedback loop is eliminated; and the converter operates in the continuous conduction mode. The controller is potentially well-suited for integrated-circuit implementation. It can be expected that a dedicated IC based on the feed-forward modulators disclosed here would be simpler and would require less i/o pins than ICs currently available for power-factor correction, while offering comparable or improved performance.Other References
| |
