Dual-channel power supply is ruggedized for marine engines
For marine engine control, Powerbox has developed the ENMA500D24/2×27-CC dual-channel power supply. It is based on a ruggedised platform for use in harsh environments and provides two 27V/20A isolated outputs and a total power of 540W. The power supply is housed in a IP56 case and is designed for efficient conduction cooling, says Powerbox. It complies with DNV/GL standards.
Many marine applications can be powered by marine-certified commercial off-the-shelf (COTS) power supplies, but others require power supplies that are specifically designed to pair with the final application. An example of this is servomotors, used to operate fast switched valves (FSV) which are used for safety in fuel injection pumps, orientable propellers and engine control.
FSV operation is based on servomotors ensuring that fluids are transferred or interrupted safely. As failure is not an option in such applications, FSV manufacturers often use two independent power supplies to guarantee redundancy. The equipment is installed in very compact and harsh environments, however, which can pose a challenge.
Powerbox has experience in designing power solutions for the marine industry to DNV/GL standards. It has therefore developed the integrated, isolated, dual-channel DC/DC converter to be resistant to high-pressure and heavy sprays of water. Being sealed to comply with IP56, the ENMA500D24/2×27-CC DC/DC converters are also optimised for conduction cooling. Two lateral heatsinks facilitate the thermal exchange between the inner dissipating components and the ambient outside.
Powered by the low voltage 24V distributed supply to electronics equipment, the ENMA500D24/2×27-CC can tolerate a wide operating range of 18 to 36V, and is able to accommodate a large voltage drop down to 10V for 10 seconds. It delivers 27V DC / 20A and a total power of 540W. Efficiency is 85 per cent and above.
Typically used for safety equipment requiring redundant power sources, and two independent outputs are required, the ENMA500D24/2×27-CC offers two 27V DC fully isolated outputs. In this case, the total output power remains at 540W though it can be balanced from 540W on one output and no load on the second to any combination the two, whilst remaining within the maximum power allowed, reports Powerbox.
The ENMA500D24/2×27-CC is protected against input reverse polarity, output short-circuit and includes over-temperature, over-voltage and over-current protection. It is designed according to EN60068-2-x and complies with the safety standard EN 60950.
