Patent ID: 7095215
Filing Date: 2006-08-22
Classification: H02M,Y02P

Abstract:
1. A circuit for providing protection for a boost converter during power disturbance conditions affecting the boost converter's input voltage, said boost converter having a switch for controlling current through an inductor, two input terminals to which an input voltage is coupled and two output terminals where the output DC power is provided, a pulse width modulated PFC controller for providing a boost function for controlling the duty cycle of said switch, comprising: a detection circuit for detecting said input voltage instantaneously such that a real time sample of said input voltage is detected; and a comparator circuit for comparing said real time input voltage sample and said output voltage; said comparator circuit having an output coupled to said PFC controller such that the boost function of the PFC controller is controlled as a function of said comparator circuit output; wherein the boost function is inhibited so long as said real time input yoltage sample exceeds said output voltage and said boost function is enabled as soon as said real time input voltage sample is less than the output voltage.