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Closed loop voltage mode controlled high step-down/step-up positive output buck–boost converter

Udumula Ramanjaneya Reddy, Hanumandla Deepika, Bellapu Vijayalakshmi

Journal of Power Technologies

2020

Vol. 100, nr 3

255--262

This work presents the positive output buck-boost (POBB) converter with single loop control and simple converter structure. The presented POBB converter achieves the square of the high step-down/step-up voltage conversion gain as compared with the traditional buck-boost (TBB) converter and also the output voltage polarity is positive. These advanced features facilitate work in a wider range of high-step-down/step-up positive output converters. In the high gain POBB converter the two controlled power switches are operated synchronously. The converter is designed to operate in continuous current mode (CCM), one in switch-on mode, during which the two inductors are energized and two capacitors are discharged, and the later one in switch-off mode, during which the two inductorsare deenergized and two capacitors are charged. The operating principles and the steady-state analysis of high step-don/ step-up POBB converter operating in CCM are presented in detail. Further, a closed loop voltage mode control (VMC) is designed and simulated to study the line and load regulations of POBB converter in both high step-down (buck mode) and high step-up (boost modes) respectively. Theoretical analysis and predictions of the closed loop VMC POBB converter have been validated using MATLAB/Simulink platform.

Voltage mode control DCM HSD-CIB PFC converter for HB-LED lighting applications

Ramanjaneya Reddy U., Narasimharaju B. L., Asif Md.

Journal of Power Technologies

2018

Vol. 98, nr 4

305--313

High-brightness light emitting diodes (HB-LEDs) are gaining immense attention from the angle of both residential and industrial applications, owing to their advanced futures of longevity, compact size, high efficacy and eco-friendly nature. To meet advanced future requirements, the LED driver should be robust and efficient. In addition, for HB-LED lighting applications, an ac-dc LED driver demands high-step-down conversion ratio, less source current harmonics, high power factor (PF) and to be cost effective. This work proposes a high-step-down coupled inductor-buck (HSD-CIB) based power factor correction (PFC) converter operating in discontinuous current mode (DCM) to attain high PF with low source current harmonics. Moreover, the proposed HSD-CIB can overcome the demerit of the existing single-stage ac-dc buck PFC converter in terms of highvoltage/current switching stress, gate-driver complexity, low conversion gain and low efficiency. This paper presents the detailed design and analysis of the proposed HSD-CIB PFC converter for an LED lighting system. A closed loop voltage mode control (VMC) is designed and implemented to study the line regulations of HSD-CIB converter at various loading conditions. The analysis of the proposed HSD-CIB topology is carried out using Matlab/Simulink simulation and validated experimentally with a prototype of 16 W.