Electricity: power supply or regulation systems – For reactive power control – Using impedance
Patent
1991-08-06
1992-07-28
Sterrett, Jeffrey
Electricity: power supply or regulation systems
For reactive power control
Using impedance
323222, G05F 170
Patent
active
051343550
ABSTRACT:
A PFC controller (FIG. 5) provides power factor correction and peak current limiting for a switch-mode power converter of any topology (buck, boost or buck-boost), without having to directly sense inductor current. The PFC control technique involves using a piecewise-polynomial analog computer (AC) to compute power transistor on-times in accordance with separate polynomial transfer functions for power-factor control and peak-current-linking using as inputs current representations of line input voltage (VLN), load output voltage (VLD), and long-term current demand (VCD). A conduction cycle is initiated by sensing when the rate of change in the inductor current reaches zero using an auxiliary winding on the current storage inductor (Wzd), and terminated after the computed on-time to implement either power-factor control or peak-current-limiting.
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Barndt B. Peter
Donaldson Richard
Hiller William E.
Sterrett Jeffrey
Texas Instruments Incorporated
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