![]() ![]() ![]() In the GaNdalf board design, Future Electronics has implemented a bridgeless totem pole PFC topology which offers very high efficiency and a low component count. In the PFC stage, the drive for efficiency has led designers to evaluate various bridgeless PFC circuit topologies, which remove the rectifying diode bridge and its associated power losses from the input of the PFC stage. Power-system designers are under more pressure than ever to achieve high efficiency across the whole ac-dc converter circuit. The PFC circuit controls the input current to synchronize it with the input voltage and to minimize reactive power losses. ![]() Power factor correction is widely used in ac-dc power supplies with an input power greater than 75W. Operating from a universal mains input range of 85- to 265-Vac, the GaNdalf board achieves a power factor of >0.98 and efficiency in the PFC stage of better than 99.0%. The GaNdalf reference design board from Future Electronics takes advantage of the low output capacitance and zero reverse recovery of the latest X-Gan HEMT power switches from Panasonic, which are fabricated from wide bandgap GaN semiconductor material. ![]()
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