Power supplies - System description
- Compliance with EN 50081 (noise emis.) & EN 50082 (noise immunity).
- Wide input voltage range.
- Output protected against short circuits and overload.
- Good power reserves.
- Robust metal housing for secure mounting.
Introduction They may be unglamorous and unobtrusive, but without them it would not be possible to operate an electronic system. Power supplies are essential. ifm offers low-cost transformer power supplies.
Switched-mode power supplies Primary switched-mode power supplies are a compact and economical solution to supply sensors and actuators. As opposed to conventional transformer power supplies with regulated output voltage they need no heavy transformers so that there are fewer iron and copper losses. They are therefore distinguished by a very high degree of efficiency of up to 94 %. Due to the operating principle by means of high frequency transformers switched-mode power supplies are much smaller and lighter than transformer power supplies with identical power. Nevertheless they guarantee an electrical separation. Furthermore, they offer a wide input voltage range as standard for worldwide use.
Power reserves Mains fluctuations up to ± 15 % and mains interference are compensated for. Even mains voltage dips of a few milliseconds are compensated for, the output voltage is completely maintained. An active inrush current limitation reduces the inrush current by means of a fixed resistor which is bridged after start up. The outputs are protected against short circuits and overload. Special output characteristics allow a current which can be up to 1.7 higher than the nominal current without switch-off with the voltage being reduced at the same time. The dimensioning of the components allows a 20 to 25 % higher output current for a short time. This power reserve is provided by all power supplies as from 2.5 A for a period of one minute. At an operating temperature of up to 45 °C this power is available continuously.