DESIGN AND MICROCONTROLLER IMPLEMENTATION OF A 3-PHASE SCR POWER CONVERTER

A single processor controls a three phase silicon controlled rectifier (SCR) power converter. An inexpensive, dual optoisolator interface to the power line provides noise rejection and an improved measure of th e zero crossing. A dynamic digital phase-locked loop (PLL) algorithm i mplemented in an Intel 87C196KD-20 processor achieves frequency tracki ng, dynamically changing characteristics for improved performance. Dyn amically modifying the PLL characteristics permits independent capture and locked dynamics. A feedforward method provides command tracking f or improved response without loss of performance. This three-component design (processor, optoisolator, and SCR gate drivers) represents a m inimal implementation with potential for closed loop voltage and curre nt control. High speed input and output resources included on the 87C1 96KD processor make an efficient single-device implementation possible . The processor is less than 1% utilized allowing for additional funct ions to be added in the future. This system operates on both 50 Hz and 60 Hz power systems without modification or loss of performance.