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380V DC distribution is becoming a necessary choice for new telecom and datacenter power infrastructure [1,2,3]. As state-of-the-art computing, routing and optical hub equipments continue to require more power, classic 48V distribution quickly becomes expensive to install and operate due to I2R losses; at the same time, AC distribution utilizing AC UPS becomes too expensive and complicated. While...
The debate on the use of Direct Current (DC) as a power distribution means has been raging for decades. Recently, one focus of the discussion has been the data center. For various reasons, AC remains the preferred method of power distribution in the data center, despite some disadvantages inherent to AC power. This is particularly interesting when one considers the fact that almost all of the critical...
The issues discussed in this paper revolve around the challenges faced and some of the progress to-date in development and deployment of 400Vdc power distribution networks targeted at telecom and data networks as an alternative to AC distribution and AC UPS power deployment.
A 20KHZ switchmode converter type rectifier will be described. The unit was designed to power a load while charging a positive grounded battery or either 23 or 24 cells. The rectifier operates from nominal 120/240VAC, 47-440HZ. The main power conversion section will be described and design requirements discussed. Performance characteristics will be detailed and analyzed for the unit. The rectifier...
The office of the future will rely on a series of complex Data Processing Systems. Included within the office's equipment needs will be such things as Word Processors, Electronic Mail Systems, and other interactive computer based office support systems. In many cases, the information being handled by these systems may be of an extremely critical nature and the possibility of data loss due to a power...
This paper will describe some of the problems that arise when attempting to charge secondary storage batteries, of the lead-acid type, from an energy source such as a photovoltaic array. A description of the means generally used to charge a lead-acid. battery in a standard photovoltaic system is given, and a proposed series regulator "smart" type system which may be used to improve battery...
This paper describes two applications where a digitally controlled programmable ringing generator may be used to provide more efficient use of ringing equipment and office space without sacrificing system reliability. The first application describes a standby ringing system which uses one digitally controlled programmable ringing generator to provide standby capability for a multi-frequency system...
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