High power density 700W supply powers medical and industrial equipment

Cosel has developed an open frame, high power density, 700W, power supply measuring 76.2 x 38.1 x 127mm (3.0 x 1.5 x 5.0 inches) is optimised for efficient cooling for use in demanding medical and industrial applications.
The GHA700F with optimised thermal conduction has a power density of 31.1W per cubic inch, making it one of the highest power density power supplies in its category for powering medical and industrial applications, according to Cosel. It is designed in accordance with safety standard IEC 60601-1, making it suitable for BF (body floating) medical applications but its high isolation and creepage distance make it particularly suitable for industrial applications, said the company. It complies with EN61558-2-16 (OVC III) and simplifies design to conform to EN60335.
To power a large range of systems bus voltages, the GHA700F is available in four output voltages: 24V DC / 29.2A, 30 V DC / 23.3A, 48V DC / 14.6A, 56V DC / 12.5A and has a universal input voltage of 85 to 264V AC. The output voltage can be adjusted using the built-in potentiometer.
The choice of power switching topology and components means it has an efficiency figure of up to 96 per cent.
The GHA700F includes inrush current limitation, over-current protection with automatic recovery when the fault condition is removed, and over-voltage protection
The growing number of medical applications operating in low noise environments is causing equipment manufacturers to optimise products to operate with limited airflow. Power supplies must combine conduction and convection cooling, offering systems designers the possibility to optimise the placement of the power supply, without compromising performance. In the GHA700F, Cosel said it has combined assisted conduction-convection cooling, power switching topologies, digital power and energy optimisation algorithms, SiC and advanced components to minimise power losses, resulting in a high efficiency, lower power dissipation power supply.
Operating temperature range is -20 to +70 degrees C ambient or up to +80 degrees C chassis. Depending on the final equipment assembly style and cooling conditions, a derating may apply.
The power supply includes an active power factor corrector with a co-efficient of up to 0.95.
The GHA700F has a 4,000V AC (2MOPP) input to output isolation voltage, 2,000V AC (1MOPP) input to frame ground (FG) and 1,500V AC (1MOPP) output to FG. In the case of the BF application, the GHA700F complies with the patient leakage current level of less than 100 microAmperes.
The GHA700F has received 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) approvals and complies with IEC60601-1-2 4th Edition and EN61558-2-16 (OVC III).
In conducted emission tests, the GHA700F complies with the FCC-B, VCCI-B, CISPR32-B, EN55011-B and EN55032-B. For further improved noise performance COSEL offers EMI / EMC filters type EAC-16-472.
To accommodate application specific requirements, five options are available including conformal coating, 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) and for applications requiring additional safety the GHA700F is available with a reinforced isolation in compliance with the IEC class II (E).
The GHA700F has a five-year warranty and conforms to the European RoHS and Low Voltage Directives.


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