The Electric Power Research Institute (www.efficientpowersupplies.org) says nearly 2.5 billion electrical products containing power supplies currently are used in the U.S., and about 400–500
million new power supplies (linear and switching) are sold in the U.S. each year. The total amount of electricity these power supplies consume is more than 207 billion kWh/year, or about 6% of the national electric bill.
“More efficient designs could save an 15-20% of that energy,” reports EPRI. “Savings of 32 billion kWh/yr would cut the annual national energy bill by $2.5 billion, displace the power output of seven large power plants and reduce carbon dioxide emissions by more than 24 million tons/yr.”
According to a report from Electronics.ca Publications (www.electronics.ca), “2007 saw double-digit revenue growth in the power supply market, which was estimated at $17.1 billion.”
There is work to be done in all aspects of energy costs in the U.S., and power supplies are part of that process. Suppliers must continue to respond to market needs for energy-efficient technologies and processes
in all sectors.
Step power supplies for small loads have a voltage versus current characteristic output. For heavy demands, it provides constant current output for starting lamp loads or capacitive loads. Some modules have adjustable output voltages, allowing for lead length compensation. The unit can be mounted on a rail or in a panel.
Model 859-801 24 Vdc/5 Vdc step-down converter produces 5 Vdc at up to 500 mA from a 24 Vdc source. Measuring 7mm with end plate, the DIN-rail mount converter is a drop-in for space-constricted applications.
CSF power supplies have short circuit, overload, overtemperature, and input/output overvoltage protections. High outrush current guarantees downstream blown fuse indication. Single-phase units are available 1–20 A/24 Vdc with adjustable range of 23-27.5 Vdc, 12-15 Vdc with adjustable range of 12-15 Vdc or 48 Vdc with adjustable range of 45-55 Vdc.
Rhino PSP line of power supplies include DC-DC converters with inputs 9.5–18 Vdc and 18–75 Vdc. The four models can be operated by all popular DC supply voltage systems. Tightly regulated output voltage provides a power source for factory automation and other equipment exposed to critical industrial environments.
FPS200 TrunkGuard fieldbus power conditioner provides conditioned power for Foundation fieldbus H1 networks in general purpose and non-incendive applications. A simplex model allows up to eight power conditioner modules on a single DIN-rail carrier to power up to eight individual fieldbus segments. Duplex configuration provides redundant, load-sharing, hot-swappable power conditioners.
Sitop power supply for applications under high shock and vibration conditions meets IEC 68-2-27 Basic Environmental Testing Procedures, Part 2; International Standard IEC 60529 Ingress Protection Rating; and MIL-STD-810F, Method 514.5, Vibration.
Siemens Energy & Automation
Phaseo switch-mode power supplies are designed for 24 Vdc output of 0.3–40 A. In addition to 100–120 Vac input, the single-phase units can accept up to 200–500 Vac input.