Patent ID: 8779737
Filing Date: 2014-07-15
Classification: H03K

Abstract:
1. A voltage converting circuit for converting an input voltage into an output voltage, the voltage converting circuit comprising: a modulation signal generator for generating a pulse width modulation (PWM) signal responsive to a feedback signal corresponding to the output voltage and a load coupled thereto; a comparator for comparing the feedback signal with a reference signal to output a comparing signal; and a logic unit for performing a logical conjunction of the PWM signal and the comparing signal to generate a control signal for adjusting an input current corresponding to the input voltage to regulate the output voltage; wherein when the load is changed from a relatively light load to a relatively heavy load, pulse widths of the PWM signal generated by the modulation signal generator are increased according to the fact that the load is changed from the relatively light load to the relatively heavy load, and the control signal generated by the logic unit is varied to substantially have a constant duty cycle according to the increased pulse widths of the PWM signal.