고성능 디지털전원장치에 관한 연구

Digital power supply controller using the Digital Signal Processor (DSP) and Field Programmable Gate Array (FPGA) has been developed over the years. Recently, full digital power supply controller has been studied and tested. A new digital controller is designed under 3U euro-standard size and provides quiet better overall performance characteristics than the standards of ± 5 ppm short-term stability (＜ 1 min) and ± 25 ppm long-term stability (＜ 12 hours). The digital controller adopted digital PID current control algorithm with single pole digital filter and feed-forward voltage ripple compensation loop. By implementation of the digital controller, it has the ability of high step resolution (150 ps) Digital Pulse Width Modulation (DPWM) for FET or IGBT switch drivers and high resolution (18-bit, 400 kSPS/2 MSPS) analogue to digital conversion for current and voltage signal measurement. In this paper, the hardware and software structures of the developed digital controller and experimental results of digital power supply are described.