Dense AC/DC power supplies for compact applications

24th October 2019
Alex Lynn

Murata has announced the PQU650 series of open-frame, 650W-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.

Measuring just six by four inch by 1U high, the power supplies accept a universal AC input voltage range of 90 VAC to 264 VAC. Utilising the latest LLC topology results in world-class efficiency levels of up to 95%, the series maintains a high 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. A useful peak output ‘power boost’ rating of 800W is available for up to 30 seconds to allow initialisation of inductive and capacitive loads.

Developed for industrial and medical applications, the PQU650 is an AC/DC, U-channel open-frame PSU certified to EN 60960 and IEC 60601 3rd Edition medical standards, meeting two MOPP primary to secondary, and one MOPP primary to chassis. An isolation figure of 4KV AC primary to secondary, and 1,500 VAC secondary to chassis are standard.

The series comprises ten models with output ratings from 12 to 54V, and 12.1 to 54.2A. Standard features include a power OK signal, PS on and remote sense, along with an auxiliary output of five volt 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 and for ‘no fan’ applications where noise and maintenance are critical, and also 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.

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