Abstract

DC-DC converters are one of the major research areas in the field of power electronics. Design-oriented study of lead compensator as well as Type-3 compensator is carried out and compared for its effectiveness in control of DC-DC buck converter. Design and development of laboratory prototype of 5 V, 3 A voltage-regulated buck converter operating at switching frequency of 25 kHz is carried out involving design and fabrication of power circuit, MOSFET gate-driver circuit, and controller circuit. The control circuit is implemented using PWM controller IC SG3525AN. The bode diagrams of control to output transfer function uncompensated as well as compensated loop gain are plotted and verified to achieve required gain crossover frequency and phase margin with high loop gain at low frequencies leading to zero steady-state error. Developed laboratory prototype of the buck converter is thoroughly tested on resistive load and experimentally verified for its dynamic performance as well as stable close loop operation.

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