Patent ID: 7965071
Filing Date: 2011-06-21
Classification: H02M

Abstract:
1. A controller for DC-DC boost converter having a switch, comprising: an error amplifier that is adapted to receive a feedback signal and that compares the feedback voltage to a reference voltage to generate an error signal; a ramp generator that generates a ramp signal; a modulator that receives the ramp signal and the error signal and that generates a pulse width modulation (PWM) signal; a clamp generator that generates a clamp signal; a comparator that receives the ramp signal and a clamp signal and that outputs a limit signal; a first logic gate that receives the PWM signal and the limit signal and that outputs a drive signal; a second logic gate that receives the PWM signal and the limit signal and that outputs an over-limit signal; a gate drive circuit that receives the drive signal and that is adapted to actuate and deactuate the switch; a flip-flop that receives the over-limit signal; a third logic gate that outputs a count-up signal; and a counter that receives a signal from the third logic gate and that outputs a signal to the clamp generator.