Cosel has announced a series of ac-dc power supplies with enhanced reliability for industrial applications.

15, 30 and 50W mains PSUs for industrial loads
Called the PDA series, the PSUs are form, fit and function backwards compatible with the company’s 20 year old PBA series, with fewer internal components explaining part of the reliability increase.

With more to follow, the initial versions are: PDA15F (15W 31 x 78 x 85mm), PDA30F (30W 31 x 78 x 103mm) and PDA50F (50W, 31 x 82 x 120mm (). Each comes in 5, 12 and 24V variants, with a potentiometer built-in for trimming.

Operation is over -20 to +70°C (with orientation and ambient temperature caveats), and the units are UL/EN62368-1 certified.

“The series has an input range of 85 to 264Vac single phase, and meets safety standards with an input range of 100 – 240Vac, 50 or 60Hz,” said the company.

Quasi-resonant topology used, achieving up to 87.5% efficiency at 230Vac and rated load. “Compared to the predecessor PBA series, the efficiency gain is more than 5%, reducing heat dissipation and as a consequence increasing system reliability,” said Cosel. “The PDA series has no built-in active PFC, although it fully complies with IEC61000-3-2 Class A.”

Detailed life expectancy is decribed in the product instruction manual. Although sometimes less, in many applications and conditions it is at least 10years, only dropping three years at 100% load, force-cooled at 70°C ambient.

Features include in-rush current limiting, over-current protection (with automatic recovery) and over-voltage protection.

Construction is open-frame with a galvanized sheet steel chassis, and the ‘N’ option adds a cover.

Isolation is 3kVac input-to-output, 2kVac input-to-frame-ground and 500Vac output-to-frame-ground.

The PDA series complies with FCC-B, VCCI-B, CISPR11-B, CISPR32-B, EN55011-B and EN55032-B in conducted emission tests.

They are RoHS and Low Voltage compliant and carry CE and UKCA marks.

The company sees them being used in measurement and process control, machine monitoring and displays.