![]() ![]() In the paper, we will discuss a Totem pole architecture and design based on SiC MOSFETs, magnetic current sensing and CCM control. With the availability of fast switching wideband gap transistor SiC and GaN based power switches, which have minimal reverse recovery charge along with other advantages, Totem Pole PFC designs can now operate in CCM mode to provide higher efficiency and higher power. In addition, the peak current will be 2 times of a CCM PFC, which increases the difficulty of EMI filter design and efficiency optimization. When using a BCM PFC, the operation frequency varies widely. ![]() But both have challenges.Ī DCM PFC can only support low power applications. This means that the Totem Pole PFC can only work in DCM (Discontinuous Conduction Mode) or BCM (Boundary Conduction Mode) mode with traditional Si-MOSFET. (A DCDC boost converter provides output voltage higher than the input voltage.) For a synchronous-rectified boost, a big problem is reverse recovery charge of the MOSFET body-Diode if the converter works in CCM (Continuous Conduction Mode) condition. Why SiC-MOSFET is needed in Totem Pole PFC designĪs Figure 2 shows, Totem Pole PFC can be considered a synchronous-rectified boost DCDC converter. Figure 1: a) Bridgeless PFC, b) Totem Pole PF Design consideration of Totem Pole PFC ![]()
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