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Communications Applications No Longer Need Isolated Bus Converters

Communications Applications No Longer Need Isolated Bus Converters

Communications infrastructure equipment has traditionally used lead-acid batteries as a backup supply, which requires the batteries to power a positive referenced 48 V distribution system to avoid corrosion (cathodic protection). As this -48 V supply is used to power +48 V electronics, isolation between the batteries and the communication electronics is required. So the use of isolated bus converters became standard practice in these applications. With modern communications systems merging with server technology, and the communication portion moving from electrical to optical systems, today’s equipment can use negative referenced+48 V backup, meaning isolation is...

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Why Engineers Need a Non-Isolated Bus Converter (NBM)

Why Engineers Need a Non-Isolated Bus Converter (NBM)

Bus converters are highly popular, flexible power components that traditionally provide an isolated intermediate bus voltage to power PoL (Point-of-Load) converters or serve as an isolated voltage source. They are widely used in applications such as ATE, server, telecom, and industrial control. Last week we announced a different type of bus converter – a non-isolated fixed ratio bus converter module (NBM) based on our ChiP package: the first bus converters that do not offer isolation. So why did we create this new category of power components? There are several advantages in removing the isolation:...

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INTELEC 2014: Highlights from the Conference

INTELEC 2014: Highlights from the Conference

INTELEC 2014 was an exciting event that showed that HVDC is delivering everything the technology promises when deployed in real applications.

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INTELEC 2013 – DC distribution: The way forward

INTELEC 2013 – DC distribution: The way forward

I recently participated at the International Telecommunications Energy Conference, INTELEC, presenting two papers as part of the High Voltage DC technical program. With its 35-year history addressing the field of power and energy in the communications industry, INTELEC yet again was able to attract some of the most interesting and knowledgeable people in the industry. I was particularly impressed by the enthusiasm around 400 Vdc distribution: there is strong real-world commitment to this approach, which has now become a reality; last year it was up for discussion and debate, but this year it is...

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Synthesis of Input Line Current in Power Factor Correction Control

Synthesis of Input Line Current in Power Factor Correction Control

Last year, Vicor presented a poster session at PCIM Europe in Nuremberg, Germany. Below is the paper from the show. Vicor will again be attending and presenting at this year’s event. Here’s a link to the conference program PCIM Europe 2013. PCIM Europe 2013 (14-16 May in Nuremburg, Germany).

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Universal AC Power Factor Correction Benefits from Adaptive Cell Topology

Universal AC Power Factor Correction Benefits from Adaptive Cell Topology

Because of the wide variation in AC line voltages around the world, universal power supplies are typically designed to accept 85 VRMS to 264 VRMS inputs. This range has imposed significant design tradeoffs on the power factor corrected AC rectification typically used in front end converters.

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