650W AC-DC Power Supplies for Compact Medical and Industrial DesignsOctober 16, 2019 by Paul Shepard
Murata has announced the PQU650 series of open-frame, 650 W-rated ac-dc power supplies by Murata Power Solutions. The PQU650 series offers the highest power-density product on the market, with forced air- and convection-cooled ambient ratings. The power supplies offer a multitude of standard features including wide output voltage adjustment range, auxiliary power rails, and a high transient capability at a competitive price.
Developed for industrial and medical applications, the PQU650 is a U-channel open-frame ac-dc power supply certified to EN 60960 and IEC 60601 third edition medical standards, meeting 2 x MOPP primary to secondary, and 1 x MOPP primary to chassis. An isolation figure of 4kVac primary to secondary, and 1500Vac secondary to chassis are standard.
Measuring 6" x 4" by 1.75" (1 U), the power supplies accept a universal input voltage range of 90- to 264-Vac. Utilizing the latest LLC topology results in efficiency levels of up to 95 percent, the series maintains a 450W convection-cooled rating. This means there are no system fan requirements for applications up to 450W at ambient temperatures as high as 50°C, and with as little as 300 LFM forced air-cooling, the available output power rises to 650W at an ambient temperature of 50°C.
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A useful peak output "power boost" rating of 800W is available for up to 30 seconds to allow initialization of inductive and capacitive loads.
The series is comprised of 10 models with output ratings from 12- to 54-V and 12.1- to 54.2-A. Standard features include a power OK signal, PS on and remote sense, along with an auxiliary output of 5V at 0.5A and a fan supply output of 12V at 0.6A. A safety cover is offered as an optional extra and screw terminals or pluggable header variants are also available.
The PQU650 is suited for industrial and medical applications where there are size constraints, for "no fan" applications where noise and maintenance are critical, and for use in transient load applications that require the PSU to provide high power for short durations.
Other applications include, but are not limited to, communications, test equipment, visual signage, broadcast, ATE, stage lighting, PoE and datacoms.