One of these designs is bridgeless totem-pole topology, which integrates the rectification and boost stage, and uses two switching branches that operate at different frequencies ( Figure 2).įigure 2 The bridgeless totem-pole topology integrates the rectification and boost stage. New semiconductor materials for power switches-particularly SiC-have created viable designs that were previously limited by silicon’s thermal and electrical characteristics. 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. It reduces the output voltage ripple while shaping the current into a sinusoidal wave.įigure 1 Interleaved boost is the most common topology for PFC. 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 ( 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 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 gallium nitride (GaN) and silicon carbide (SiC)-has enabled the implementation of bridgeless topologies like totem-pole PFC. So, power supply designs require advanced power factor correction (PFC) circuitry to meet strict power factor (PF) standards to mitigate these issues. Three topologies are commonly used in power supply designs: Interleaved boost PFC, bridgeless totem-pole PFC and interleaved totem-pole PFC.Īs more electrically-powered devices are connected to the grid, the increased distortion to the electric grid can create problems in the electrical distribution network.
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