100% duty-cycle buck-derived and 0% duty-cycle boost-derived...

Details 100% duty-cycle buck-derived and 0% duty-cycle boost-derived... 100% duty-cycle buck-derived and 0% duty-cycle boost-derived...

2007-11-21

2009-12-15

Laxton, Gary L (Department: 2838)

Electric power conversion systems

Current conversion

Using semiconductor-type converter

C363S089000, C363S124000, C323S207000

Reexamination Certificate

active

07633782

ABSTRACT:
This invention teaches power factor corrected 3-phase ac-dc power converters in which the duty-cycles are determined by “natural modulation”, that is, they are forced by a fixed algorithm that has been optimized for efficient switching. The duty-cycles do not regulate the output voltage but they do force the input currents to be proportionately correct for good power factor. A feedback control circuit modulates the effective turns-ratio of a variable dc-dc transformer to regulate the output voltage. For a buck converter, the most efficient duty-cycle is 100%, that is, the buck switch is always on. For a boost converter, the most efficient duty-cycle is 0%, that is, the boost switch is always off. “100% duty-cycle” as defined for a buck 3-phase ac input means that there is no off-time. The switch duty-cycles are as follows: The duty-cycle for the phase with the highest voltage magnitude (the dominant phase) is 100%, and sum of the duty-cycles of the other two phases equals 100%. “0% duty-cycle” as defined for a boost 3-phase ac input means that the input is never short circuited line to line. The duty-cycle for the switch for the phase with the highest voltage magnitude (the dominant phase) is 0%, and switches of the other two phases modulate to control their respective input currents.

REFERENCES:
patent: 5502630 (1996-03-01), Rokhvarg
patent: 6545887 (2003-04-01), Smedley et al.
patent: 6731524 (2004-05-01), Elek et al.
patent: 7139180 (2006-11-01), Herbert

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