650W open frame AC-DC converter for compact medical and industrial applications

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By Nick Flaherty

Murata has developed a 650W open frame AC-DC converter with forced air- and convection-cooled ambient ratings fo rmedical and industrial applications.

The open frame AC-DC converter has a wide output voltage adjustment range, auxiliary power rails and a high transient capability. It measures 6″ x 4″ by 1 U high and accepts a universal AC input voltage range of 90 VAC to 264 VAC. It uses an LLC topology for efficiency up to 95 percent with a 450 W convection-cooled rating. This means there are no system fan requirements for applications up to 450 W at ambient temperatures up to 50°C, and with as little as 300 LFM forced air-cooling, the available output power rises to 650 W at an ambient temperature of 50°C. A useful peak output ‘power boost’ rating of 800 W is available for up to 30 seconds to allow initialization of inductive and capacitive loads.

Developed for industrial and medical applications, the U-channel open frame AC-DC converter is certified to EN 60960 and IEC 60601 3rd Edition medical standards, meeting 2 x MOPP primary to secondary, and 1 x MOPP primary to chassis. An isolation figure of 4 KV AC primary to secondary, and 1500 VAC secondary to chassis are standard.

The series comprises ten 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 5 V at 0.5 A, and a fan supply output of 12 V at 0.6 A. A safety cover is offered as an optional extra, and screw terminals or pluggable header variants are also available.

As a result, the PQU650 is aimed at 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 converter to provide high power for short durations.

Next: Other open frame AC-DC converter applications

Other applications include communications, test equipment, visual signage, broadcast, ATE, stage lighting, PoE and datacoms.


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