1200-W AC/DC power supply targets industrial applications

Powerbox has launched a 1200-W AC/DC power supply for industrial applications. The OFI1200A is optimized for conduction cooling, delivering high performance across a baseplate temperature range of -40°C to 95°C without the use of a fan. The power supply operates over a wide universal input range from 85 to 305 VAC with power factor correction (PFC).

The OFI1200A is available in three versions with a single-output DC voltage: 12 V/84 A,  28 V/43 A, and 48 V/25 A. Using a high-efficiency topology, the typical efficiency for the 48-V output unit at 230 VAC input is 92%. The unit includes a PFC with a coefficient of 0.98/0.95 (110 VAC/230 VAC).

The OFI1200A has been designed to guarantee optimal heat transfer from the dissipating components to the baseplate, said the company. A derating may apply as specified in the technical documentation.

Meeting a range of applications, the output voltage and current of the new power supply can be adjusted from near zero to the maximum allowed for each model, said the company. “Industrial applications such as professional lighting or even low-power electrolyzers require the power supply to deliver constant current, and this must be easily adjustable.”

To precisely adjust the voltage and current, the OFI1200A offers two analog inputs, the VTRM and ITRM. One example cited includes a 28-V output that can be adjusted from near zero volts up to 33.6 V, and the output current from near zero amps up to 43 A. The output voltage can also be adjusted using the onboard potentiometer.

The extended trimming and control function simplifies the use of the power supply in constant voltage (CV) or constant current (CC) mode, without adding external circuitry, said Powerbox.

For applications requiring redundancy or higher power, nine units can be connected in parallel for a total power level of up to 9,720 W in conduction-cooling mode. To maintain the highest level of efficiency when operated in parallel or in redundancy-mode, optional active ORing circuitry deploying high-performance FET technology (Option-O) is available on the OFI1200A28 and OFI1200A48, said the company.

The OFI1200A has passed shock and vibration testing as specified in MIL-STD-810H and are designed to sustain 20-G level shocks. The power supply is certified in accordance with UL62368-1 3rd edition, cUL (equivalent to CAN/CSA-C22.2 No.62368-1). It meets the European RoHS, REACH, and Low Voltage directives and carries the CE, UKCA and cURus markings.

The OFI1200A, in an open frame, measures 142 × 39 × 260 mm (5.59 x 1.54 x 10.36 inches) and weighs 1.2 kg maximum. An optional metal cover is available, adding 1 mm to the height and 200 grams to the weight (Option-N). With a three-year warranty, the power supply can be used in a range of harsh applications such as electronic equipment installed in a sealed box, radio communication systems subject to adverse weather conditions, outdoor displays and traffic signaling, and indoor equipment with audible noise restrictions.