Development in the field of electrical engineering is quick and commendable. Even though the nonlinear power electronic equipments introduce power quality issues, their use is unavoidable. Most of the medical equipments make use of power electronic devices. Serious issues include low input power factor and increased ripples in the input current. Many bridgeless topologies have been introduced to mitigate the above mentioned problems. Common topologies make use of buck, boost, Cuk and Sepic converters. In this paper bridgeless zeta converter with one cycle control for display monitors in hospitals has been proposed. With one cycle control, input perturbations are avoided in one switching cycle. The converter is designed to supply the load of 50W and 24V. MATLAB/Simulink model has been analyzed for various conditions. A laboratory prototype of the converter has also been made and tested for the designed values. Results of simulation have been verified with the hardware system. Power factor has been observed to be above 0.97.
P. K. Preetha, “Power Factor correction circuit with One Cycle Controlled bridgeless zeta converter for display monitors in hospitals”, in TENCON 2015 - 2015 IEEE Region 10 Conference, Holiday Inn, Sands Cotai Central Macao SAR, China, 2015.