DESIGN AND ANALYSIS OF FPGA BASED HIGH-RESOLUTION DIGITAL PULSE WIDTH MODULATORS TECHNIQUE FOR DC-DC CONVERTERS

ELECTRICAL AND ELECTRONICS

The Digital pluse width modulation (DPWM) have become one basic buliding blosk in digital control architectures of any power converter. Hence it has become an integral part of all System on Chips.The Traditional Digital pulse width modulator implementation are based on counters and comparators which generate the power converter gating signals according to several predefined thresholds are based on counters and comparators which generate the power converter gating signals according to several predefined thresholds. For these designs, the minimum on-time step is equal to the counter clock period. DC-DC converters for proper system performance, by proposing differende design methods and control approach with growing tendency to using digital implementation over analog practices. Because of the rapid advancement in semiconductors and microprocessor industry, digital control grew in popularity among pulse width modulators converters and is taking over analog techniques due to the availability of fast speed microprocessors, flexibility, and immunity to noise and environmental variations. Furthermore, increased interest in Field Programmable Gate Arrays (FPGA) makes it a convenient design platform for digitally controlled converters. New digital control schemes, aiming to improve the steady-state and transient responses of a high switching frequency FPGA–based digitally controlled DC-DC converters. The target is to achieve enhanced performance in terms of tight regulation with minimum power consumption and high efficiency at steady–state, as well as shorter settling time with optimal over– and undershoots during transients. VHDL and Verilog are employed for the coding of the Digital Controller, synthesis has been done using Modelsim, and Behavioral and Timing simulation has been handled by ModelSim.

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