Patent ID: 6348781
Filing Date: 2002-02-19
Classification: H02M,H03F

Abstract:
A buck or boost voltage converter, comprising:a buck converter having a buck switch that selectively applies input voltage to a first storage element, and produces an output voltage less than the input voltage; a boost converter, cascaded with the buck converter, having a boost switch that receives and boosts an input voltage and selectively applies either the boosted input voltage or ground to a second storage element to produce an output voltage greater than the input voltage; a low pass filter receiving and filtering an output voltage from the cascaded buck converter and boost converter, to produce a filtered output voltage; and a control circuit that supplies a buck switching signal to the buck switch to produce a bucked voltage, and a boost switching signal to the boost switch to produce a boosted voltage, the control circuit activating only one of the buck switching signal and boost switching signal during each of a plurality of clock cycles, and wherein crossover distortion is substantially eliminated.