Digital control power supply using the high-speed DSP and quasi-PID control

Abstract

In order to control output voltage with stability, digital power supplies repeatedly perform high-speed computations in cycles ranging from several μs through to several tens of μs. Until recently, the digitization of power supply controls required lengthy processing times and used assembly language, and developers and design engineers had to be constantly mindful of execution times. Consequently, this method became the subject of research amongst highly skilled engineers. Although many products have used analog control power supplies up until now, it is anticipated that digital power supplies with dual capabilities for both “information” and “control” will be used more frequently in the future. This paper discusses how a digital power supply was created using object-oriented tools and C++ programming language to enable even those engineers with no programming skills to easily create digital power supply programs. The prototype used in our experiments was the TMS320F2808 DSP (Digital Signal Processor) manufactured by Texas Instruments.