Patent ID: 8076913

Claim:
A voltage converter for generating an output voltage signal, comprising: a controller for generating a control voltage signal according to the output voltage signal and a first reference voltage; a wave generator for generating a saw-wave signal and modifying at least one of an upper limit and a lower limit of a waveform of the saw-wave signal according to the output voltage signal; a first comparator for generating a pulse width modulation (PWM) signal according to the control voltage signal and the saw-wave signal; and a voltage converting unit for generating the output voltage signal according to the PWM signal; wherein the wave generator comprises: a second comparator for comparing the output voltage signal with a second reference voltage; and an oscillator for generating the saw-wave signal and changing the least one of the upper limit and the lower limit of the waveform of the saw-wave signal according to a compared result of the second comparator.