Failure Mode: The reason a power supply or system
either does not meet or stops meeting specifi ed
parameters.
Fan Cooled: See Forced Air Cooling.
Faraday Shield: An electrostatic shield that reduces
coupling capacitance in transformers. The shield,
which reduces output common mode noise, is placed
between the primary and secondary windings of a
transformer.
Fault Mode Input Current: The input current drawn
by a power supply when the output is shorted.
Fault Tolerant: A power system confi guration optimized
for continuing operation without shutdown.
Typically involves the use of a redundant topology (i.e.
N+1, etc.) and the ability to remove and replace power
modules without disturbing system operation (hot-plug
capability). Thus, the failure of any one power module
will not cause a system failure.
FCC: The Federal Communications Commission is a
US government agency that sets standards for, and
governs the testing of conducted
and radiated emissions. These are
system level standards, but they are
typically used in specifying converters.
See EMC (Electromagnetic
Interference).
Feedback: The process of returning part of the output
signal of a power supply to its input, where it is used
to control or regulate the output.
Feed Forward: A method of improving line regulation
by directly sensing the input voltage of the power
converter. See Line Regulation.
Ferroresonant Transformer: A transformer in which
part of the core is driven into saturation by a resonant
tank circuit. The output of the transformer, taken from
the saturated portion, is relatively immune to variations
in input voltage. Used in ferroresonant power
supplies.
Filter: A circuit that passes one frequency or band
of frequencies while blocking others. See Input Line
Filter, Common Mode Filter, Pi Filter and Output
Filter.
Failure Mode: The reason a power supply or system
either does not meet or stops meeting specifi ed
parameters.
Fan Cooled: See Forced Air Cooling.
Faraday Shield: An electrostatic shield that reduces
coupling capacitance in transformers. The shield,
which reduces output common mode noise, is placed
between the primary and secondary windings of a
transformer.
Fault Mode Input Current: The input current drawn
by a power supply when the output is shorted.
Fault Tolerant: A power system confi guration optimized
for continuing operation without shutdown.
Typically involves the use of a redundant topology (i.e.
N+1, etc.) and the ability to remove and replace power
modules without disturbing system operation (hot-plug
capability). Thus, the failure of any one power module
will not cause a system failure.
FCC: The Federal Communications Commission is a
US government agency that sets standards for, and
governs the testing of conducted
and radiated emissions. These are
system level standards, but they are
typically used in specifying converters.
See EMC (Electromagnetic
Interference).
Feedback: The process of returning part of the output
signal of a power supply to its input, where it is used
to control or regulate the output.
Feed Forward: A method of improving line regulation
by directly sensing the input voltage of the power
converter. See Line Regulation.
Ferroresonant Transformer: A transformer in which
part of the core is driven into saturation by a resonant
tank circuit. The output of the transformer, taken from
the saturated portion, is relatively immune to variations
in input voltage. Used in ferroresonant power
supplies.
Filter: A circuit that passes one frequency or band
of frequencies while blocking others. See Input Line
Filter, Common Mode Filter, Pi Filter and Output
Filter.
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