700W power supply is optimised for conduction cooling applications

A power supply for industrial applications operates across a baseplate temperature range of -40 to +95 degrees C without the use of a fan. The OFI700A by Powerbox operates with a wide universal input range from 85 to 264V AC with power factor correction (PFC) and is available with DC outputs of 12V, 28V (adjustable to 24V) or 48VDC. A 12V auxiliary is also provided.

For applications where cooling by fans or blowers is not desirable, for example  equipment installed in supervisory rooms or offices to avoid generated noise. Conduction cooling requires very specific building practices and the OFI700A has been designed to guarantee optimal heat transfer from the dissipating components to the baseplate, delivering a high level of performances within a wide operating temperature range at baseplate. Depending on the assembly method and the overall cooling conditions, a derating may apply as specified in the technical documentation.

To cover a wide range of applications, the OFI700A operates with a wide universal input range from 85 to 264V AC. The unit includes a PFC with a co-efficient of 0.95/0.92 (110V AC / 230V AC). For applications powered by a DC bus e.g., mining equipment, the OFI700A operates from 120 to 350V DC.

The OFI700A is available in three versions of single output DC voltage, 12V / 58.4A,  28V / 25A and 48V / 14.6A. The output voltage can be adjusted using the onboard potentiometer. The 28V output can be adjusted from 22.4 to 33.6V, covering the 24V applications. An additional voltage of 12V / 0.1A is provided for auxiliary functions.

For applications requiring 1+1 redundancy it is possible to connect two units in parallel, adding an external diode to protect the unit. This increases power losses which, depending on the output current, could be as high as 30W. To maintain the highest level of efficiency when operated in redundancy-mode, an ‘option O’ version is available with active ORing circuitry deploying high performance FET technology. In this version, the power losses are minimised to less than 1.5W.

For safety, the OFI700A has an in/out isolation of 3,000V AC and in/FG of 2,000V AC. Output isolation to FG is 500V AC. The power supply includes over-current protection with auto recovery, over-voltage and over-temperature protection.

The OFI700A board includes easy access to auxiliary functions via on board connectors, namely remote control, output voltage sensing, DC-OK, inverter operation mode (IOG) and auxiliary 12V.

The OFI700A has endured shock and vibration testing as specified in MIL-STD-810H and is specified to sustain a high 20G vibration level during transportation.

The open frame power supply measures 126 x 38 x 250mm (4.96 x 1.5 x 9.84 inches) and weighs 0.95kg (max). An optional metal cover is available, adding 2.0mm to the height and 150g to the weight.

The OFI700A is certified in accordance with UL62368-1, C-UL (equivalent to CAN/CSA-C22.2 No.62368-1), EN62368-1. It also carries a three-year warranty and conforms to the European RoHS, REACH and Low Voltage Directives. The product carries the UL, CE and UKCA marks.


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