SolaHD SDN-C Series Data Sheet

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Power Boost Function of the SDN-C Series Power Supply

By Mike Johnson,

Vice President, Product Marketing

Each SDN-C power supply from SolaHD incorporates an important feature
called Power Boost. Power Boost allows the power supply to provide 150%
of its output current during overload conditions. Unlike many competitive
products, the SDN-C does this while maintaining its rated output voltage.
is allows for the start up of high inrush devices such as solenoids, air valves
and contactors without disrupting other loads on the power supply.

ere is a potential downside of any over current function that allows greater than the rated current. is could require
special load wiring or over current devices on the output of the power supply to deal with that additional current. e
SDN-C eliminates that need by also incorporating short circuit detection. is detection overrides the Power Boost
function when the power supply detects a direct short circuit (less than 0.03 ohms resistance between the output
terminals).

To illustrate the Power Boost and short circuit functionality, let’s use the SDN20-24-100C as an example. In the
following graph, the power supply will output 30A for at least 4 seconds (20A * 150% = 30A). is will allow high
inrush loads to start without interrupting the rated voltage to other loads.

In the next graph we show the output under a direct short circuit. e unit periodically attempts to restart, and will
recover automatically once the short circuit is removed.

A signicant advantage of the SDN-C design over many competitors is that it will supply enough overload current
to start up high inrush loads (relays, contactors, solenoids and DC motors), but still have short circuit protection to
prevent wires from burning during a short circuit.

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Website: www.solahd.com