Frequency modulation controller for single-switch, polyphase, DCM boost converter and method of operation thereof

摘要

A controller for a polyphase discontinuous conduction mode (DCM) boost converter, a method of controlling a DCM boost converter and a DCM boost converter incorporating the controller or the method to reduce its input current distortion. The DCM boost converter (which typically has only a single switch) includes: (1) a ripple detector, coupled to a polyphase input of the DCM boost converter, that develops a ripple signal based on an input ripple voltage and (2) a harmonic modulator, coupled to the ripple detector, that develops a ramp signal based on the ripple signal and a control signal and controls a switching frequency and a duty cycle of a switch in the DCM boost converter based on the ramp signal and an output voltage excursion signal.