Method and apparatus for pulse width modulation with variable frequency modes

摘要: The number of pulses modulated during each period the input frequency to a pulse width modulator is controlled be multiple frequency, where changed as predetermined range boundaries are crossed. increased inversely with so that, at lower ranges greater period. Unstable switching prevented boundary crossover by defining two limits one limit slightly higher than and other boundary. Decreasing (increasing period) then crosses first (longer increasing (decreasing second (shorter