Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Reexamination Certificate
2008-04-22
2010-10-26
Riley, Shawn (Department: 2838)
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
C323S283000, C323S285000
Reexamination Certificate
active
07821237
ABSTRACT:
A power factor correction (PFC) controller and method uses a finite state machine to adjust the duty cycle of a pulse width modulation (PWM) switching control signal. The PFC controller has a target current generator that receives the link output voltage and generates a target current proportionate to the rectified line input voltage. The PFC controller further includes a comparator which outputs a two-level current comparison result signal. The finite state machine responsive to the two-level current comparison result signal, generates a switch control signal that has a duty cycle which is adjusted for controlling the switch so that the sensed current is approximately proportionate to the rectified line input voltage, such that power factor correction is performed.
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Lin, Esq. Steven
Riley Shawn
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