High power density power supplies for demanding medical and industrial applications

03-03-2023 | Cosel | Power

COSEL Co, Ltd has introduced its new open-frame high power density, 700W, 3" x5" power supply optimised for efficient cooling in demanding medical and industrial applications. Based on the robust platform with optimised thermal conduction, the GHA700F provides 700W within a 3" x5" industry footprint. With a power density of 31.1W per cubic inch, it is one of the highest power density power supplies in its category for powering medical and industrial applications. It is designed in accordance with safety standard IEC 60601-1, making it suitable for Body Floating medical applications. However, its high isolation and creepage distance make it ideal for demanding industrial applications, complying with EN61558-2-16 (OVC III) and simplifying design to conform to EN60335. To power a large range of systems-bus-voltages, the GHA700F is available in four output voltages, 24, 30, 48 and 56VDC and has a universal input voltage of 85 to 264VAC. Employing the latest power switching topology and components, the device offers an excellent efficiency figure of up to 96%.

The device accepts a universal input voltage of 85 to 264VAC, provides up to 700W in four output versions: 24V/29.2A, 30V/23.3A, 48V/14.6A, 56V/12.5A. For ease, the output voltage can be modified using the built-in potentiometer. It incorporates inrush current limitation, over-current protection with automatic recovery when the fault condition is removed, and over-voltage protection.

The device can be operated in an expansive environmental temperature range of -20C to +70C ambient or up to +80C chassis. A derating may apply depending on the final equipment assembly style and cooling conditions.

The power supply incorporates an active power factor corrector with a coefficient of up to 0.95. The switching topology and power components have been thoroughly selected to provide the highest efficiency, reaching 96% in all versions.

The GHA700F has a 4,000VAC (2MOPP) input to output isolation voltage, 2,000VAC (1MOPP) input to Frame Ground (FG) and 1,500VAC (1MOPP) output to FG. In the case of the Body Floating application, patient leakage current must be less than 100 microamperes, which the power supply is fully compliant with.

Addressing medical and industrial applications, the device has received the following agency approvals: UL62368-1, EN62368-1, c-UL (equivalent to CAN/CSA-C22.2 No.62368-1), ANSI/AAMI ES60601-1, EN60601-1 3rd, c-UL (equivalent to CAN/CSA-C22.2 No.60601-1) and complies with IEC60601-1-2 4th Edition and EN61558-2-16 (OVC III).

In conducted emission tests, the device complies with the FCC-B, VCCI-B, CISPR32-B, EN55011-B and EN55032-B. For even further improved noise performance COSEL offers EMI/EMC filters type EAC-16-472.

To accommodate application-specific requirements, five options are offered, including conformal coating (C), a set of sub-features comprising isolated 5V and 12V auxiliary output - Remote Control - Power Good (R3), M3 threaded mounting hole (T3), connection of an external hold-up time extension unit (U1). The GHA700F is available with reinforced isolation in compliance with the IEC class II (E) for applications requiring additional safety.

The power supply measures 76.2mm x 38.1mm x 127mm [3" x 1.5" x 5.0"] (W x H x D) and weighs 570g maximum.

By Seb Springall