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    Air Convection Cooled Open-Frame Power Supplies


    Highly efficient to reduce energy consumption and certified safe at 200% peak-power for industrial applications

    Industrial applications require efficient power supplies that can operate in various environments with a high level of safety.

    Addressing this are the 150W and 300W free air convection cooled power supplies, the LHP150F and the LHP300F by COSEL Co, Ltd. that have a universal input voltage range of 85 to264VAC and a high typical efficiency rating of 93%. Designed for industrial applications requiring high levels of safety, the LHP150F and the LHP300F are certified according to EN62477-1 Over Voltage Category Three (OVC III). The products are available in five different output voltages commonly used in industrial automation and processes, with 200% peak power capability for up to 10 seconds for dynamic loads. The standard product is an open frame PCB type, with a chassis and cover available as an option.

    The device protection category implies that the final equipment powered by the products can be connected directly to the main distribution panel without adding an extra level of isolation, simplifying the system designer’s task and reducing cost while guaranteeing a high level of efficiency.

    The LHP150F and LHP300F have an input voltage of 85 to 264VAC. Five output voltages are available: 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.

    Industrial applications often require a higher current during start-up or peak operation. For this, 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). The switching stage uses an LLC resonant topology combined with the latest generation of power semiconductors, delivering a typical efficiency of up to 94%.

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

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

    Exhibiting versatility and attention to detail, to accommodate application-specific requirements, many options are available including Coating (C), Low leakage current (G), EP connector type (J4), Remote ON/OFF (R), Chassis (S), Chassis & Cover (SN), Terminal block type (T), Connector to an external capacitor bank (U1), Output 8 pin connector (LHP300 only) (J5), Push-in terminal block (T4), and Built-in DC fuse (DC).

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

    Source: electronicsforu.com