How do you find the Q of an inductor?
The quality factor Q of the inductor is by definition = wL/R, where w is the frequency and R is the resistance of the inductor, and L is is its inductance. The integrated inductors has a complicated distributed equivalent circuit not only having self resistance but also parasitic capacitance.
What is the Q factor of coil?
Quality factor (Q) or coil Q-factor is a dimensionless unit for the losses of a coil, quartz, or a resonator. For coils this refers to the ohmic losses of the coil-wire. They are inversely proportional for the coil quality and are calculated from the ratio of reactance to ohmic resistance.
What is quality factor in bridge?
The quality factor or the Q factor of an inductor at the operating frequency ω is defined as the ratio of reactance of the coil to its resistance. Thus for a inductor, quality factor is expressed as, Where, L is the effective inductance of the coil in Henrys and R is the effective resistance of the coil in Ohms.
How can Q inductor be improved?
Thicker wires, and sometimes silver or silver plated wires may be used to reduce this and improve the overall inductor Q factor. Skin effect: The skin effect affects the inductor Q because it has the effect of raising the resistance.
What is Q factor in capacitor?
Q Factor definition In an AC system, the Q factor represents the ratio of energy stored in the capacitor to the energy dissipated as thermal losses in the equivalent series resistance. For example, a capacitor that is capable of storing 2000 joules of energy while wasting only 1 joule has a Q factor of 2000.
What does the Q stand for in an inductor?
Inductors (Coils) The Q value is a parameter that indicates the quality of an inductor. “Q” stands for “Quality Factor”. Coils easily pass direct current but act as a resistor to alternating current.
How to calculate the quality factor of an inductor?
In order to calculate the Q, quality factor for an inductor, the formula or equation below can be used: As the resistance is equal to 2 π f L, this can be substituted in the formula to give: Looking at these formulas it can be seen that the overall, inductive reactance, X varies according to the frequency.
Why is the inductor Q factor frequency dependent?
In addition to this, the resistive losses which are made up from the skin effect, radiation losses, eddy current, and hysteresis are also frequency dependent, even though they are resistive losses. These effects too will also affect the inductor Q factor.
How to select the correct inductors for switching regulators?
It is normally in the order of 10-500mVpk-pk. Selecting the correct ripple current also affects the size of the inductor and the output capacitor. This capacitor must have a sufficiently high ripple current rating, or it overheats and dries out.