This is called interleaving, which improves efficiency and reduces the input current ripple. Power factor correction can be achieved using just one boost converter, but often two or more converters are connected in parallel, with a phase shift between the converters. This reduces the output voltage ripple while shaping the current into a sinusoidal wave.įigure 1: Interleaved Boost PFC Schematic Then the boost converter steps the voltage up to a higher value.
This topology uses a boost converter in addition to a rectifying diode bridge that converts the AC voltage to DC voltage (see Figure 1). Interleaved boost PFC is the most common topology for power factor correction. This article compares these three topologies when used in different applications. Furthermore, advanced totem-pole controllers such as the MPF32010 have simplified the control of complex designs such as interleaved totem-pole PFC. The most commonly used topology for power factor correction is boost PFC, but the advent of wide-bandgap (WBG) semiconductors - such as GaN and SiC - have enabled the implementation of bridgeless topologies like totem-pole PFC. To mitigate these issues, power supply designs require advanced power factor correction (PFC) circuitry to meet strict power factor (PF) standards.
Lattice Semiconductor Reference DesignsĪs more electrically powered devices are connected to the grid, the increased distortion to the electric grid can create problems in the electrical distribution network.Switching Converters and Controllers AECQ Grade.
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