Gresham Power Unveils Open Frame Switch Mode Power Supplies

Gresham Power Electronics announced its latest open frame switch mode power supply family, the HD365, which offers 365W in a 76 x 127mm (3 x 5 inch) footprint providing what the company describes as a class leading 18W/in^³ power density. According to the company, just a few years ago this package size could only be expected to offer 100W.

For cPCI system builders Gresham’s latest rack mount product the *CPCI-6U-600 now provides 600W in a standard 6U with universal ac or a 48Vdc input. The company states that the CPCI-6U-600 offers the highest power density on the market and some 20% more power from its standard package than most competitors.

The HD365 series of switching power supplies from Gresham Power utilizes advanced component and circuit technologies to deliver what is described as the industry’s smallest 365W switcher. The series has been designed for medical, telecom and industrial applications and to satisfy 1U height considerations, the package measures only 3.00 x 5.00 x 1.30". All models offer universal ac input with active power factor correction (PFC), flexible output configurations and compliance to worldwide safety and EMC standards.

Standard features include: universal ac input with PFC, low profile 1U package, convection cooled operation up to 220W, 12V/1A auxiliary output to power fan, RoHS compliant, and high efficiency operation of 90% (typical). Standard output voltages are 12, 24 and 48Vdc with customer specific alternatives available on request.

Gresham Power’s cPCI product range deliver up to 500W of continuous power. The complete range of cPCI products incorporate the standard Positronic 47-pin connector and are fully compliant with the PICMG® 2.11 power interface specification. These cPCI power supplies incorporate active power factor correction. An 85–264Vac universal or dc input models covering a range from 18–72Vdc, makes them well suited for use in almost any application.

Gresham states that its unique design uses two converters in parallel, one for the +3.3V and the other for the +5V. This design provides the flexibility for determining unique load requirements for each channel independently and for drawing a full load. The company states that the cPCI series provides design engineers with the flexibility they need to meet virtually any design requirements. Standard features include a monitor and control (M&C) system based on an intelligent I²C bus, all models are PICMG 2.11 compliant, offer hot-swap and N+1 redundant operation, and have up to 4 outputs, fully featured status and control functions.