Many of Power Designs products feature a technology called UNIPLY®
Uniply® offers a wide range of voltage and current in a single output
bench power supply. It provides features not obtainable with common
dissipative circuits. Because of its inique design, it's like having a
family of power supplies at your fingertips. By providing higher current
at low voltages and higher voltage at lower currents, Uniply® allows
maximum flexibility in a single output power supply. No longer is it
necessary to have a variety of power supplies available for different
purposes. A single replaces a multitude of power supplies.
Basically, the power supply output is divided into several distinct
ranges. Each range has its own DC source which automatically selected
according to the output voltage and current requirements. When the
voltage level is increased or reduced, the appropriate current range
will be automatically selected. The Uniply® circuitry accomplishes all
adjustments seamlessly and fully automatically.