Patent ID: 8823346
Filing Date: 2014-09-02
Classification: H02M,Y02B,Y02P

Abstract:
1. A controller for a boost converter in which the boost converter includes an inductor, a power switch, a diode and an output capacitor coupled together to convert a rectified AC input voltage to an output DC voltage, the controller comprising: a first node for receiving an output sense signal indicative of the output DC voltage; a sense amplifier including an input receiving a first sense signal indicative of the rectified AC input voltage and including an output providing a second sense signal indicative thereof; a sampler which samples said second sense signal based on said pulse control signal and which provides a boost current sense signal indicative thereof, wherein said sampler samples during a freewheeling interval of the boost converter and provides said boost current sense signal as an average of sampled values; a first combiner which provides an error signal based on a difference between said output sense signal and a reference signal; an integrator which integrates said error signal and which provides a compensation signal indicative thereof; and a pulse controller which provides a pulse control signal for controlling the power switch to operate the boost converter in discontinuous conduction mode, wherein said pulse controller develops said pulse control signal based on comparing said compensation signal with a ramp signal and further adjusts said pulse control signal over a cycle of the rectified AC input voltage based on said boost current sense signal.