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The invention achieves a power density higher than 10 W/in^3 from universal ac input through the increase of the switching frequency. The device's ability to operate at switching rates much higher than conventional power converters allows for the device to maintain high efficiency even at a smaller size. The invention is can handle high operating frequencies due to circuit topologies that are capable of operating with relatively small inductances and large capacitances. The device is capable of operating within a wide range of input voltages (85-245 VAC RMS) and loads, with good power factor (0.9-0.95), and efficiencies of 90% or higher.