# reflected impedance

## reflected impedance

[ri′flek·təd im′pēd·əns]
(electricity)
Impedance value that appears to exist across the primary of a transformer due to current flowing in the secondary.
Impedance which appears at the input terminals as a result of the characteristics of the impedance at the output terminals.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
To see this effect intuitively, we use reflected impedance concept.
If the initial [[omega].sub.1] and [[omega].sub.2] are set to be [[omega].sub.0], A([[omega].sub.2]) and B([[omega].sub.1]) terms become zero, which removes the mutual coupling in the reactance of the reflected impedance.
where [Z.sub.A] is the reflected impedance. By (6) and (7), [Z.sub.A] can be expressed as
The DC voltage [U.sub.1] remains stable after dynamic change in a period of time, which means reflected impedances from secondary side to primary side maintain being constant.
Taking into consideration the passive elements considered above, the real and imaginary part of the reflected impedance can be computed:
If the excitation source has the same frequency as the wire's frequency of resonance, [omega] = [[omega].sub.w] = 1/[square root of [L.sub.w] x [C.sub.w]] the reflected impedance is purely resistive: [Z.sub.ref] = Re{[Z.sub.ref]} = [omega][M.sub.1][M.sub.2]/[R.sub.w], which means that the imaginary part is zero.
Then, the effect of impedance mismatch increases because the reflected impedance changes depending on the degree of coupling.
5(a) with the reflected impedance, Zr, from the receiver for simplifying the calculation of the input impedance of transmitter [17, 18].
Since the latter varies with cardiac contractions, cardiac-related modulation of the reflected impedance results.
Also, the primary may be an open circuit and the reflected impedance exaggerating the impedance to the in-rush current.
This is not always true, however, as the reflected impedance on the primary changes with frequency.
In order to derive the impedance of the transformer, reflected impedance is adopted.
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