When power factor correction devices are connected to the system, they set up a parallel resonance
circuit between their capacitors and the system network inductance.
There is the added issue of meeting international harmonic control requirements such as IEEE-519 which limits "the maximum frequency voltage harmonic to 3% of the fundamental and the voltage total harmonic distortion (THD) to 5% for systems with a major parallel resonance
at one of the injected frequencies." Some form of filtering is subsequently recommended.
The series resonance ([f.sub.s]) appears at 1620 and 1647 MHz, while the parallel resonance
([f.sub.p]) is apparent at 1611 and at 1629 MHz.
Based on the equivalent circuit model, a parallel resonance
can also be produced by Cp and Ls, where the capacitor can be seen to be open-circuited.
A stopband DMS with its parallel resonance
equivalent circuit is reported in .
Besides, EPC only represents the first parallel resonance
between inductor and the parasitic capacitance.
Hence, we present four topologies that are composite right/left-handed transmission line (CRLH TL) , dual-CRLH TL (D-CRLH TL) , series resonance and parallel resonance
Consequently, transmission line [L.sub.1] and [L.sub.2] compensate the parasitic elements of PIN by resultant parallel resonance
at on-state and series resonance at off-state in both of the structure.
When building the power delivery impedance profile from a combination of capacitors, an important feature is the parallel resonance
, which develops between two real capacitors connected in parallel.
C3 provides an AC ground to assure the parallel resonance
will not be affected by other parasitic like bond-wires, test board microstrip line effects and supply noises.
The properly tuned PC is in parallel resonance
with the grid-to-ground network capacity at fundamental power supply frequency.
For lossless unit cell equivalent circuit model, L-C parameters of series and parallel branches are extracted from the series and parallel resonance