Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : buck converter


Design and Implementation of a High Resolution Two Counter Digital Pulse Width Modulation

Jassim K. Hmood

Engineering and Technology Journal, 2009, Volume 27, Issue 7, Pages 1260-1269

This paper presents a high resolution Digital Pulse Width Modulation "DPWM" for the
voltage regulator application. The PWM signal is generated by using two fast clock
counters. In this approach, the pulse width is combined from two parts depending on two
counter schemes. MSBs of the DPWM generates first part of pulse that achieved by a first
counter-phase comparator scheme, and the LSBs of the DPWM generates second part of
pulse that obtained through a second counter- phase comparator scheme. The resolution of
present pulse width depends on the resolution of second counter.
The developed pulse width modulator has high precision, good linearity, and wide duty
cycle range. Further, it can be flexibly reconfigured for multi-phase PWM operation with no
restriction on duty cycle range. In this work, a 714 kHz switching frequency DPWM module
with 9- bit resolution is tested by simulation program