Design of a Digital Programmable Control IC for Single-Phase Controlled Rectifiers

This paper presents the design of a digital programmable control IC which is intended for controlling thyristors to produce a constant current source via a single- phase controlled rectifier. The architecture of the control IC consists of three major parts: a single-phase controlled triggering circuit, an inverse cosine look-up table, and a proportional-integral current controller. All the three parts have been designed using VHDL language. The simulation model of a constant current source based on a single-phase controlled rectifier has also been constructed by using Simulink and ModelSim cosimulation tool. The designed control IC circuit has been implemented on an Altera Flex 10K FPGA logic device. Further, the control parameters in this IC are programmable and the variables can be observed via an SPI interface to a monitoring processor. Simulation and experimental results are shown to verify the viability of the proposed control IC properly