Analytical and Comparative Evaluation of Advanced Digital PWM Control Techniques

The focus of this paper is the exploration of the technologies related to generation of digital signals which can be used for voltage control applications. Three distinct methods have been described. The first one concerns with coding Pulse Width Modulation (PWM) and Sinusoidal PWM (SPWM) signals in Verilog and obtaining the output on a Field Programmable Gate Array (FPGA). The second technique relates to an FPGA with code dumped via Laboratory Virtual Instrumentation Engineering Workbench (LabView). LabView interfaced with ELVIS II kit to enable the generation of digital signals is the third implemented scheme. The features of these procedures are presented briefly along with their corresponding platforms. The benefits of using digital signals as compared to their analog counterparts have also been touched upon. The paper demonstrates Pulse Width Modulation (PWM) and multi-carrier Sine Pulse Width Modulation (SPWM) digital output. SPWM implemented by Verilog coding and dumped on FPGA, results in a huge reduction of cost and complexity as compared to other methods.