Design and FPGA implementation of an all-digital two-quadrant general pulse-width modulator

This paper proposes an all-digital general pulse-xwidth modulator (ADGPWM) that is an improvement of the general pulse-width modulator (GPWM). The ADGPWM allows overmodulation and negative carrier and reference signals to be managed. The proposed all-digital implementation is suited both to serial/concurrent data processing platforms and to integrated circuit implementation, to realize several control algorithms for switching power converters. The VHDL design of the ADGPWM is synthesized and tested on a board which is based on a commercial field-programmable-gate-array (FPGA). Several details of the all-digital implementation are discussed thoroughly and experimental results are given in order to assess its validity.