Thermal runaway - the condition whereby an increase in a
component's or system's temperature will increase its power dissipation, which
further increases its temperature. This cycle will continue until
Thyristor - See Silicon Controlled Rectifier in this
Topology - The configuration of a power supply or power
system. As an example, the topology of a power supply may be that of a
two transistor half-bridge converter, a full bridge converter, a linear
regulator or a ferroresonant magnetic regulator. The topology of a power
system may be an architecture that focuses on centralized, decentralized or
distributed power conditioning hardware.
Transient - an instantaneous change in voltage or any
other parameter, which is outside the normal excursions.
Undershoot - an instantaneous sagging of a voltage caused
by a sudden increase in current.
Uninterruptible Power Supply
(tTS) - a device which usually contains a battery to provide
operational power during short-term degradation of the prime power source.
Voltage multiplier - a diode capacitor circuit
configuration used to produce 2, 3 or 4X the output voltage of a pulsed
Voltage regulation - a process whereby the output voltage
is maintained within specified limits during variations of input power, output
load and temperature.
Withstand voltage - the potential that the insulation or
isolation resistance can tolerate before breaking down (e.g., transformer
insulation or dielectric between isolated components and chassis).
Wye connection - an electrical distribution system
employing four conductors, one for each of the three Phases and one for
neutral, which, is usually depicted as the capital letter "Y" where the
intersection of the three legs of the letter is the Neutral connection and the
extremities represent phases A, B, and C in a clockwise rotation.
Zener Diode - a PN junction diode forced or broken-down
into avalanche (reverse biased) where it establishes a very stable reference
voltage having a very low dynamic resistance and which is somewhat insensitive
to variations in temperature.