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PCB for 300W open-frame AC-DC converter is optimized for convection cooling

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By Nick Flaherty


Cosel in Japan has launched 150W and 300W open frame AC-DC converters with PCBs optimized for free air convection cooling.

The LHP150F and the LHP300F are certified to EN62477-1 (OVC III) for safety in industrial applications and operate from 85 to264VAC with five different output voltages commonly used in industrial automation and processes. There is a 200 percent peak power capability for up to 10 seconds for dynamic loads and an overall efficiency of 93 percent.

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The standard product is an open frame PCB type, with the placement of the components on the PCB designed to optimise the flow of air for convection cooling. A chassis and cover available as an option. 

The five output voltages available are 24V, 30V, 36V, 42V and 48V with respective output current of 6.3A, 5.0A, 4.2A, 3.6A and 3.2A for the LHP150F and 12.5A, 10.0A, 8.4A, 7.2A and 6.3A for the LHP300F. The output voltage can be adjusted using a built-in potentiometer.

Next: Dynamic power and PFC


The LHP150F and LHP300F are designed with a high dynamic control level and a power stage able to sustain long peak loads making it possible to deliver 200% for up to 10 seconds of the nominal power when a peak load situation occurs. For example, the LHP150F 24V output version delivers a permanent current of 6.3A with up to 12.6A peak. The same ratio applies to all versions of the LHP150F and LHP300F.

For low harmonic current distortion, the LHP150F and LHP300F use an active Power Factor Corrector (PFC), and the switching stage uses an LLC resonant topology combined with the latest generation of power semiconductors, conferring a typical efficiency of up to 94%.

Optimized for convection cooling, the power supplies can be operated within an ambient temperature range of -10 to +70 degree centigrade. Depending on the assembly method and ventilation across the final equipment, a derating may apply as specified in the technical documentation.

The open frame LHP150F measures 75 x 27 x 160mm (2.95 x 1.07 x 6.30 in) and weighs 320g max, while the LHP300F measures 84 x 37 x 180mm (3.31 x 1.46 x 7.09 in) and weighs 580g max.

The LHP150F and LHP300F have an input to output isolation of 3,000VAC, input to ground (FG) of 2,000VAC and output to ground (FG) of 500VAC. They include built-in inrush, overcurrent and overvoltage protection circuits.

Both power supplies comply with safety requirements UL (USA), C-UL (Canada), DEMKO (Denmark), and TUV (Germany). The products are UL62368-1, C-UL (equivalent to CAN/CSA-C22.2 No.62368-1), EN62368-1, EN62477-1 (OVC III) certified. The LHP150F and LHP300F are as well complying with DEN-AN.

The LHP150F and LHP300F series have a five-year warranty and conform to the European RoHS, REACH and Low Voltage Directives.

www.coseleurope.eu/Products/AC-DC/LHP

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