White Papers

How Adaptive Cell Topology Benefits AC Applications

June 11, 2013
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With the wide variation in AC line voltages around the world, universal power supplies are typically designed to accept 85VRMS to 264VRMS inputs. This range has imposed significant design trade-offs on the power factor corrected AC rectification typically used in front end converters. The Vicor PFM isolated AC-DC converter with PFC, and the AC Front End Module both have Adaptive Cell™ topology at their heart, providing a breakthrough in AC front end power factor correction that addresses these trade-offs to provide a consistently efficient solution. It does so by introducing innovation at three different...

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Designing Power Distribution Networks for Automated Test Equipment

January 3, 2013
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The demands on power architectures designed for automated test equipment (ATE) applications have increased dramatically as these systems become more complex. Only a few years ago, many ATE systems used simple “silver box” supplies, but this is no longer a sustainable approach. Modern ATE circuitry requires more power to operate, whilst voltage and current requirements span a wide range. At the same time, these power systems need to accurately and quickly modulate various voltage rails in order to completely characterize the performance of a device under test (DUT). The power system has therefore become...

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Optimising Processing Real Estate

October 10, 2007
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Optimising Processing Real Estate

The drive to create metadata processing server systems plus the parallel push for increased port density and triple-play (voice/video/internet) traffic handling in telecommunication systems places greater demands on power management architectures. The problem: inefficient power architectures Traditional designs using AC to 12 Vdc Silver Box followed by 12 V to 1.x Vsynch buck have run aground in terms of system power density and efficiency due to a combination of distribution bus losses and fundamental restrictions in topology performance as processor voltages reach sub-volt levels. Higher voltage (48 V or 350/380 V) bus voltages reduce...

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