COMPUTER-BASED CONTROLLER-DESIGN FOR QUANTUM BOOST SERIES RESONANT RECTIFIER

To obtain a stable output voltage from a recently-developed rectificat ion circuit called a quantum boost series resonant rectifier (QBSRR), two control schemes, digital PI (proportional-integral) control and de adbeat control, are derived for a computer-based system. Since the out put voltage regulation loop has a sampling time corresponding to the z ero crossing point of the AC line voltage, the output voltage can be c ontrolled regardless of the 120 Hz ripple component. By deriving a sim ple and exact model for the current program loop (open loop) of a QBSR R and using the pole-assignment technique, the controller gains can be systematically designed in the digital PI control scheme. The deadbea t control scheme is also developed to maintain fast dynamic performanc e in the presence of any load variations. In this control scheme, the controller gain is adjusted in accordance with the load information us ing a load estimation method. Simulation and experimental results are presented to verify the usefulness of these two control schemes.