Design of a digital programmable control IC for common-neutral half-bridge bilateral AC-DC-AC converters

In this paper we present the design of a digital programmable control IC for common-neutral half-bridge bilateral AC-DC-AC converters, employing an Altera Flex 10K100 CPLD device. This control IC performs the prostaged boost power-factor-correction (PFC) control of the converter and poststaged PWM inverter control. We adopted hierarchical, modular, and circuit resource concurrency design method for reducing the design complexity of the control IC. Owing to the high-speed nature of the CPLD, the sampling frequency of the constructed IC can be raised up to 50 KHz that cannot be easily achieved using a conventional microprocessor-based digital controller. The control parameters in this IC are programmable and the variables can be observed via an interface to a monitoring processor. Experimental results are presented to verify the viability of the proposed control IC.