Digital control of alternator using Delta Sigma technique
Thondapu Vignu, Charan Kumar Babu
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Modern semiconductor technology has made it possible for conventional analog Automatic Voltage Regulators to be replaced with digital technology to provide low cost control solutions for robust regulation with added functionality. The thesis investigates the technical difficulties associated with implementation of digital control and describes the development of a Digital Voltage Regulator (DVR) used in alternator products. The DVR uses Delta-Sigma control to eliminate limit cycling that occur at frequencies lower than the switching frequency in digitally controlled PWM (DPWM) converters. The advantages of using Delta Sigma over Dithering or sophisticated hardware with high resolution is clearly illustrated. The complete system is modeled and simulated in Simulink. The simulation results confirm the elimination of limit cycles using delta sigma technique. Later a prototype of the DVR and Digital Alternator System Emulator (DASE) are developed using Microchip PIC 16F877 and the corresponding experimental results are shown to confirm the simulation results.