Dual channel 540W marine power supply for engine control

April 02, 2020 //By Nick Flaherty
Powerbox's ENMA500D24/2x27-CC 540W dual channel marine power supply comes in a sealed IP56 box with conduction cooling.
Powerbox's ENMA500D24/2x27-CC 540W dual channel marine power supply comes in a sealed IP56 box with conduction cooling.

Powerbox has developed a dual channel marine power supply for engine control applications.

The ENMA500D24/2x27-CC is based on a ruggedised design for harsh environments and provides two 27V/20A isolated outputs and a total power of 540W. The marine power supply is housed in a robust IP56 case and is designed for efficient conduction cooling so that it complies with DNV/GL standards. Two lateral heatsinks facilitate the thermal exchange between the inner dissipating components and the ambient outside.

From local low power DC-DC converters powering sensors to high power DC generators powering the whole boat, ships and vessels are full of electrical and electronic equipment requiring robust and safe power supplies. Although many applications can be powered by marine certified commercial off-the-shelf (COTS) power supplies, others are very specific, requiring unique power solutions designed to pair with the final application.

One example being the servomotors used to operate Fast Switched Valves (FSV) like the ones used for safety purposes in fuel injection pumps, orientable propellers, and engine control.

FSV operation is based on servomotors ensuring that fluids are transferred or interrupted with the highest level of safety. As failure is simply not an option in such types of equipment, FSV manufacturers often use two independent power supplies to guarantee redundancy. However, considering the equipment is installed in very compact and harsh environments, this can be a challenge for the installer.

Powered by the low voltage 24V distributed supply to electronics equipment, the ENMA500D24/2x27-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. The marine power supply  delivers 27VDC / 20A and a total power of 540W and has an efficiency superior to 85%.

Typically used for safety equipment requiring redundant power sources, when redundancy is not required but the application requires two independent outputs, the ENMA500D24/2x27-CC offers two 27VDC fully isolated outputs. In that case


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