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PARALEL RESONANCE
RESONANCE FREQUENCY OE PARALLEL-RESONANCE CIRCUIT
Characteristics of a parallel-resonant Circuit
Were we found that Q = XL/¬R indicates the quality of a coil. The higher the Q, the more the coil will Act as a pure inductor. Remember that resistance in an inductive circuit decreases the phase angle, adds to the circuit impedance, and cause a wider bandwidth in a tuned circuit.
Consider the circuit in Fig. 18.1-1. Consider the Q of the circuit to be high. There will be a particular frequency where XL = XC. This frequency may be defined as the condition for parallel resonance in a high-Q circuit and is similar to the condition for series resonance.
There are other definitions for parallel resonance. Parallel resonance can be considered as the frequency at which the impedance of the parallel is maximum. It may also be considered as the frequency at which the parallel impedance of the circuit has unity power factor.
These there definitions may lead to three different frequencies, each of which may be considered as the resonant frequency. In circuits where Q is greater than 10, however, the three condition lead to the same resonance frequency. In a high Q circuit the formula for the resonance frequency F, is the same as in the series resonant circuit and is given by


Fig. 18.1-1. Parallel resonance circuit.



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Resonansi Paralel

Admintasi total:(Rumus)



Saat resonansi: (Rumus)
f.

Pada saat resonansi, inpedansi Z maximum, sehingga arusnya minimum.
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Admintasi total: (Rumus)

Saat resonansi: (Rumus)


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