High Pf and Low THD Buck-Boost Power Driver for Led Lamps Using PI Controller

An integrated double buck-boost converter circuit, which can act as a high power factor, low output current ripple, and good efficiency driver for power LED lamps. The input stage is based on the integration of buck boost converter which performs power factor correction (PFC) from a universal ac source, using the PWM operation mode as a control loop. The integrated double buck-boost (IDBB) converter features one controlled switch and two inductors that supply a solid-state lamp from the mains, providing high power factor and good efficiency. In this project, the IDBB converter is analyzed with and without Control algorithm (PI controller), and a design methodology is proposed using Matlab. It is demonstrated that, with a careful design of the converter, the filter capacitances can be made small enough so that film capacitors may be used. The results obtained using PI controller and fuzzy logic controller for the same circuit are compared and are presented which validates high input power factor and superior control over the output voltage.