High-frequency, High Density PFC Power Conversion

Applications

This technology can be used to improve grid interfaced power converters involved in applications ranging from powering handheld devices to distributing power throughout giant server farms. 

Problem Addressed

High efficiency (90% or higher) conventional power converters for DC power supplies operate at low switching frequencies (200Hz or lower) and require bulky magnetic elements. These systems are large and expensive, and achieve low power densities of 10 W/in or lower. New power conversion circuit architectures containing semiconductor devices have been demonstrated successfully to dramatically reduce the size and cost of power converters in low power (10-100W) grid interfaced converters. This technology introduces high-frequency power converter designs that are capable of operating in high-power level systems from ac universal input voltage. Furthermore, the invention reduces the size and cost of conventional power converters by using relatively small passive energy storage components instead of the large storage components used in conventional power conversion systems. 

Technology

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. 

Advantages

  • Smaller size
  • Reduces costs 
  • Wide operating range
  • High efficiency