Page 291 - Electrical Engineering Dictionary

Flyback converter.

same spin state, resulting in emission of light sity and neutron velocity, e.g., neutrons per
with a very short lifetime, typically nanosec- square cm per second.
onds.
flux density lines of magnetic flux per unit
2
fluorescent lamp typically a lamp made area, measured in tesla; 1T = 1Wb/m .
by exciting a low pressure discharge in mer-
cury vapor and other gases; mercury, when flux line See direction line.
excitedinthedischarge, predominantlyemits
257 nm radiation (ultraviolet) which is ab- flux linkage quantity that indicates the
sorbed by a phosphor on the inside wall of the amount of flux associated with a coil. Flux
lamp tube; the phosphor fluoresces, emitting linkage is denoted by the symbol λ and
a white light spectrum in the visible. expressed in Webers (Wb) or Weber-Turns
(Wb-t). For a single turn coil, flux linkage is
the same as the flux. Flux linkages of an N
fluoroscopy a mounted fluorescent screen
turn coil are Nφ Wb-t.
on which the internal structure or parts of
an optically opaque object may be viewed
fluxmeter an instrument that measures the
as shadows formed by the transmission of X-
change in magnetic flux within a coil by in-
rays through the object.
tegrating the induced voltage with respect to
time.
flush the act of clearing out all actions be-
ing processed in a pipeline structure. This
flyback converter the isolated version of
may be achieved by aborting all of those ac-
the buck-boost converter. In this case, the
tions, or by refusing to issue new actions to
transformer is also an inductor that stores en-
the pipeline until those present in the pipeline
ergy when the transistor is on and releases
have left the pipeline because their process-
energy to the output when the transistor is off.
ing has been completed.
The primary and the secondary of the trans-
former conduct alternately. The advantage of
flux (1) lines that indicate the intensity this topology is that through the addition of
and direction of a field. Intensity is usually a second winding on the input inductor, i.e.,
represented by the density of the lines. to form a transformer, electrical isolation is
(2) a measure of the intensity of free neu- achieved. This type of transformer is called a
tron activity in a fission reaction, closely re- flyback transformer or flyback inductor. See
lated to power, the product of neutron den- also buck-boost transformer.

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2000 by CRC Press LLC