The PULS XT40 family of semi-regulated 3-phase, 960 watt power supplies has a unique and innovative design for producing 24VDC from 3-phase power, especially for power systems. Models are available with 24, 36, 48 and 72VDC output voltages. Using a semi-regulated resonant converter enabled PULS to develop a very compact design with extremely high efficiency and only a small compromise in some output features that will be discussed later in this article. These limitations are not critical for motors or power applications.

The XT40 is extremely compact with a width of only 96mm and weighs 1.4kg. Even with the small size, the XT40 is up to 96% efficient with only 45W of heat loss. This allows the unit to be mounted in a small enclosure without the fear of excess heat affecting the operation of the unit. There is also no need for additional cooling. The unique design of the XT40 does not use electrolytic capacitors on the input stage resulting in a near zero inrush current when the unit is energized. Also included on the input side is a high power factor. When combined with the high efficiency this produces a very low input current. The active input transient blocker prevents high voltage spikes such as those produced from VDE 0160 event. A VDE 0160 spike can occur when a fuse, circuit breaker, or contactor opens up under load. When this event happens, a large voltage spike up to 1300V is transmitted up and down the AC power lines affecting the adjacent connected equipment. The XT40 blocks these transients protecting itself from any damage. The output can deliver 125% peak power capability with no change in the output voltage. Motors can be difficult to start with standard power supplies, especially under load, but the XT40 was designed to handle these demands. In addition to the 125% reserve power, the XT40 can deliver up to twice the rated current for a short period of time, with a change in the output voltage. Extremely high currents will shut the unit down to protect the output stage of the supply.

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