Product category:
Power Supplies and Uninterruptible Power Supplies
News Release from: Excelsys Technologies | Subject: 3gen LN series power supplies
Edited by the Engineeringtalk Editorial
Team on 06 December 2000
Advanced filter technology on AC/DC
power supplies
Excelsys Technologies has launched a range of innovative switch-mode AC/DC power supplies, the 3gen LN series, featuring exceptionally low noise outputs.
Excelsys Technologies has launched a range of innovative switch-mode AC/DC power supplies featuring exceptionally low noise outputs The new 3gen LN series power supplies employ state-of-the-art magnetic amplifier technology and an innovative active noise attenuation circuit to provide the type of low noise performance traditionally associated with linear supplies, combined with the high conversion efficiencies, low weight and small physical dimensions of latest-generation switch-mode designs
Available with 400, 600 or 1000 Watt power output capabilities, the 3gen LN series offers users a choice of one, two or three isolated outputs, each of which can be configured from any of four output modules, spanning voltages from 3 to 27V.
All models in the series offer conversion efficiencies of around 75%, and meet the EN61000-3-2 standard for harmonic current content, due to take effect in 2001.
The 3gen LN series is based on a completely modular design concept.
A two-transistor forward converter front-end drives a planar magnetic main transformer, which then couples to a high frequency magnetic amplifier in each of the modular output stages.
This approach enables the power supplies to be cost-effectively configured for an extremely wide range of applications.
There are four single-output modules to choose from, with nominal outputs of 5V/30A, 12V/20A, 18V/15A and 24V/12A.
The output voltage of each module can be adjusted over a wide range via a multi-turn potentiometer; for example, the 5V module can be adjusted from 3V to 5.5V, and the 24V module can be adjusted from 12V to 27V.
Each output module also incorporates a specially-developed magnetic amplifier with an active noise attenuation circuit, which enables it to emulate the low noise performance of a linear supply; the 5V module, for example, exhibits a noise level of just 1mV peak-to-peak, or 100æV rms.
Excelsys 3gen LN series power supplies are particularly suitable for use in noise-critical applications such as analytical instrumentation and high-specification measurement and audio/broadcast equipment, and are also an ideal replacement for linear power supplies.
All 3gen LN series power output modules provide a single fully floating output, and have zero minimum load requirements, making them exceptionally easy to integrate.
Line regulation is typically held to within ñ0.1%, and load regulation is typically ñ1.0% for a 75% change in load demand.
The modules can be connected in series or parallel to increase output voltage or current capacity, and feature comprehensive protection against over-voltage, over-current and over-temperature conditions.
The power supplies offer a choice of three input modules, to provide a total capacity of 400W, 600W or 1000W.
Each of these modules features a universal input that accommodates any voltage within the range 88 to 264VA (at 47 to 63Hz) or 150 to 370VDC.
The power supply will continue to hold up for a minimum of 20ms after the loss of AC power, and a mains failure detect function is available as an option.
There are two versions of 3gen LN series containment housings: a 4-slot unit which can house an input module and one or two power output modules, and a 6-slot unit which accommodates the input module and up to three power output modules.
The 4-slot unit measures 127 x 270 x 65mm (W x D x H) and the 6-slot unit measures 187 x 270 x 65mm.
Both units are fitted with integral cooling fans with a 34bB(A) rating (the 6-slot unit has two fans) and employ high quality screw terminals for all power connections.
All Excelsys 3gen LN series power supplies have a 3000VAC input/output isolation rating and carry a full set of international safety approvals, including EN60950 and UL1950.
The supplies also meet the rigorous EN55022 Level B requirements for conducted emissions, and comply with the relevant parts of EN61000-4-x for immunity to electrostatic discharge, electromagnetic fields, fast transients, line surges and voltage dips.
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