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EETE JULAUG 2012

DESIGN & PRODUCTS POwER SUPPlIES Rugged AC/DC power unit targets railway Open frame 40w, AC/DC power supplies applications with 400w output on a 102x51mm PCB Absopulse Electronics has introduced the POL 400R Series railway Available now from MicroPower Direct, the MPO-40S series quality, ac/dc switch mode power supplies. The units meet rele- is a family of high performance 40W open frame AC/DC pow- vant sections of EN50155 for electronic equipment used on railway er supplies fabricated on a compact 102x51mm PC board. rolling stock. The devices also comply They offer the small size, robust with EN50121-3-2 and EN55022 Class performance and economy required B conducted and radiated EMI and by a wide variety of OEM applica- applicable EN61000 standards. The 400 tions. Eight standard models operate W power supplies operate from input from a universal input of 90 to 264 sources of 115 Vac (97‐132 Vac range) VAC, providing tightly regulated or 230 Vac (195-264 V) and deliver single outputs of 3.3, 5, 9, 12, 13.8, outputs of 12 Vdc, 24 Vdc, 36 Vdc, 48 15, 24, or 48 VDC. Standard features Vdc or 110 Vdc. Efficiency is between 80 and 90%, depending on include filtering to EN55022 Class B, the input/output configuration required. The POL 400R Series has compliance to EN 61000-4, and tight line/load regulation. All comprehensive protection features including 3000Vdc input/out- models are protected for over load, and short circuit faults. put isolation, overload protection and current limiting. An optional The MTBF of the MPO-40S (per MIL HDBK 217F) is greater output redundancy diode allows for parallel connection to achieve than 400 khours. All models are approved to EN 60950. Each higher output power or N+1 redundancy. Other options include model is rated for operation over the wide operating tem- an output fail alarm and an LED adapter can be installed on the perature range of -10°C to +70°C (ambient). terminal block to indicate an output ‘ON’ condition. The POL 400R MicroPower Direct units are conduction cooled and operate in a -40 to +70°C cold www.micropowerdirect.com plate temperature range for full specification. Housed in rugged, compact 131x66x232mm enclosures, the power supplies are fully encapsulated in a thermally conductive MIL-grade silicon rubber 300-w 3U CompactPCI power supplies target compound, which protects against high levels of shock and vibra- tion (EN61373/IEC61373), moisture, dust and other contaminants. ruggedised industrial and marine applications ABSOPULSE Electronics Gresham Power Electronics has launched ruggedised versions www.absopulse.com of the company’s 300 W, 3U cPCI power supply. Available in 24 VDC, 48 VDC and universal AC input versions the ruggedised power supply range has a conformal coat- 3U form-factor PSU delivers 400w of power ing for extreme industrial, MIL/COTS and marine applications. Fully compliant to the configurable to five DC outputs PICMG 2.11 Power Interface Specification Pulse Electronics’ 3U form-factor PSU for VPX applications the AC 3U 300R provides 300W maximum is now available with optimized Positronic P47 connections power in standard 3U x 8HP shelf space and can be configured to deliver more than 400 W of power with interconnection via a Positronic 47 plus provide an additional high pin connector. The new cPCI power sup- power 28 V protected output. plies are hot-swap and parallel redundant enabled. Extra-high Pulse Electronics’ 3U form-factor power density allows up to 40 A to be drawn from the +3.3 VDC power supply unit (PSU) is now output and 30A from the +5 VDC output at 55ºC. The two main available with optimised Posi- outputs feature remote sense and OR-ing diodes allowing single tronic P47 connections allowing wire current sharing for increasing output power or n+1 redun- delivery of more than 400 W of dant operation. The power supply has control signals for over- power. The PSU, which is intended for military and aero- temperature, over voltage and over current protection as well space VPX-based applications, comprises a number of Pulse as power-good and inhibit for systems integration. Input good, Electronics’ high-reliability, planar technology power mod- power fail and over temperature front panel LED indicators are ules and can be configured to have up to five DC outputs. also fitted. The new Gresham ruggedised CompactPCI power For example, one configuration might be: +12 V, -12 V, +5 V, supplies are industry standard size, 3U x 8HP, and have the +3.3 V and an auxiliary +3.3 V; all referenced to a common customary +5 VDC, +3.3 VDC and ±12 VDC outputs. The AC 0 V. Of these output voltages, +12 V tends to be the one of input model has a universal input from 90–264 VAC and active which the highest power and current are now demanded, power factor correction. Very high efficiency and power den- rather than the historic high current outputs for either the sity are achieved by employing independent parallel converter 5 V or 3V3, in light of the trend to down-regulate closer to topology and state of the art synchronous rectification, low processors. Through the use of optimised P47 connections, profile magnetics and a high degree of surface mount assembly. and feeding out on up to four pins rather than the single pin, Gresham Power offer a very wide range of 24 VDC, 48 VDC and some 25 A (i.e. 300 W) of peak power can be provided on the AC input cPCI products including the market leading CPCI- +12 V output. The use of P47 connections also means the AC-6U-650 6U 650 W output model. The DC input versions of PSU can be configured to provide a 28 V protected output cPCI power supplies are suitable for vehicle and ground station (rated up to 320 W). installations while the AC models meet conventional rack based Pulse Electronics requirements. www.pulse-electronics.co.uk Gresham Power Electronics www.greshampower.com 24 Electronic Engineering Times Europe July/August 2012 www.electronics-eetimes.com


EETE JULAUG 2012
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