Realization of Unity Power Factor for Ac/Dc Boundary Conduction Mode Flyback Converter With Any Specific Turn’s Ratio

Abstract

The boundary conduction mode (BCM) flyback converter is widely used topology because of numerous advantages like isolation between input and output circuits, minimum component count, low operating duct-cycle, and simple structure. However, it is not possible to achieve high input power factor (PF) as the on-time is constant. It causes the input current total harmonic distortion (THD) to not satisfy IEC61000-3-2 limits. For improving the PF of the BCM flyback converter, a variable on-time control (VOTC) method has been introduced. The implementation circuits are also discussed. For verifying the validity of proposed technique, the simulation results are carried out.

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“…In order to meet relevant harmonic standard and reducing input current distortion, various researchers have proposed different types of power factor correction (PFC) converters (García et al, 2003;Singh et al, 2011;Memon et al, 2016;Memon et al, 2018aMemon et al, , 2018bMemon et al, 2019aMemon et al, , 2019bMemon et al, , 2019cMemon et al, , 2019dMemon et al, 2020aMemon et al, , 2020bMemon et al, , 2020c.…”

“…So the industries have formed different standards like IEC61000-3-2 limit and IEEE 519. In order to meet relevant harmonic standard and reducing input current distortion, various researchers have proposed different types of power factor correction (PFC) converters (Memon et al, 2020a(Memon et al, , 2020b(Memon et al, , 2020c. The DC/DC converters or choppers such as buck, boost and buck-boost etc.…”

Modified variable on-time control scheme to realize high power factor for AC/DC integrated Buck-Boost converter

“…In order to meet relevant harmonic standard and reducing input current distortion, various researchers have proposed different types of power factor correction (PFC) converters (García et al, 2003;Singh et al, 2011;Memon et al, 2016;Memon et al, 2018aMemon et al, , 2018bMemon et al, 2019aMemon et al, , 2019bMemon et al, , 2019cMemon et al, , 2019dMemon et al, 2020aMemon et al, , 2020bMemon et al, , 2020c.…”