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Digital controllers implemented in an FPGA for switching power converters are becoming an important alternative to the traditional analog solutions. Assuming that the digital controller is described using a hardware description language (VHDL), the ADVance MS mixed-signal simulation tool is used to simulate in closed loop the digital controller in order to analyze the finite word-length effects. The...
Variable frequency drives (VFD) are subject to various types of disturbances especially cyclical ones. These periodic disturbances are difficult to compensate by conventional controllers. Repetitive control can only compensate for constant frequency fluctuations. PWM inverter based VFDs are subject to periodic disturbances with variable frequency. In this paper, a new angle domain based iterative...
This paper describes a new digital control method to enhance the dynamic performance of a dc-dc converter used in Plasma Display Panels (PDP). A simple digital PID compensator with duty ratio feed-forward control is proposed to minimize the output voltage variation for continuously changing load current. The duty ratio feed-forward is calculated using a noise-free load current information, which is...
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