A characteristic of a conductor, measured by the ratio of the electromotive force or voltage induced in the conductor to the rate of change of the current that produces the voltage. A stable current produces a stable magnetic field, and a changing current (alternating current) or fluctuating direct current produces a changing magnetic field, which in turn induces an electromotive force in a conductor in this magnetic field. The magnitude of induced electromotive force is proportional to the rate of change of current. The scaling factor is called inductance, which is represented by the symbol L, and the unit is Henry (h). Inductance is the property of a closed loop, that is, when the current passing through the closed loop changes, electromotive force will appear to resist the change of current. This kind of inductance is called self-inductance, which is the nature of the closed loop itself. Suppose that the current in one closed loop changes and the other closed loop generates electromotive force due to induction. This inductance is called mutual inductance. When two inductance coils are close to each other, the change of magnetic field of one inductance coil will affect the other inductance coil, which is mutual inductance. The magnitude of mutual inductance depends on the self-inductance of the inductance coil and the coupling degree of the two inductance coils, and the components made by using this principle are called transformers.
What is the definition of lead inductance?
Lead inductance is generally used in high frequency circuits. All capacitors have lead inductance and internal parasitic inductance, and the vias of printed boards also produce inductance. The existence of these inductors is unfavorable to high-speed design and power supply design, so the lead inductance must be reduced as much as possible at any time. Inside the capacitor, the dielectric material determines the zero value of the self-resonance frequency. Moreover, these materials are sensitive to temperature, which causes the capacitance of capacitors to change with the change of temperature. When used as a bypass or decoupling capacitor, the change of this capacitor may cause the loss of filtering effect, so the more stable the temperature characteristics of dielectric materials are, the better. Dielectric material, parasitic inductance and other parameters can be summarized as two equivalent parameters, namely equivalent series inductance (ESL) and equivalent series resistance (ESR), which are all connected in series with the capacitor. The existence of these two parameters will weaken the function of the capacitor as a bypass capacitor, and the smaller the equivalent series inductance (ESL) and equivalent series resistance (ESR), the better.
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What is the definition and function of inductance coil?
Definition: An induction coil is wound around an insulating tube with wires insulated from each other. The insulating tube can be hollow or contain iron core or magnetic powder core, which is called inductance for short. It is expressed by L, and the units are Henry (H), MilliHenry (mH) and Micro Henry (uH),1h =103mh =106uh.
Function: The electrical characteristics of induction coil are opposite to that of capacitor, "blocking high frequency and passing low frequency". High-frequency signals will encounter great resistance when passing through the inductance coil, and it is difficult to pass; However, the resistance of low-frequency signals through it is relatively small, that is, low-frequency signals can easily pass through. The resistance of the inductance coil to direct current is almost zero.
What is inductance? What does an inductor do? Simple and easy to understand?
In pure resistance elements, the phases of current and voltage are always the same, but when alternating current passes through the coil, the phase of current will lag behind that of voltage. When the frequency of alternating current is determined, this hysteresis is defined as inductance value.
Many functions. Common:
1 filter. Using the characteristics of different inductance values and frequency characteristics, different harmonics in the system can be filtered. In extreme cases, a large inductor (large coil) can be used as a lightning arrester to isolate AC and DC.
2 vibration. Together with capacitors, resistors and other components, it forms a resonant circuit and converts DC into AC. This is the principle of inverter.
3 compensation. In the transmission network of power system, there are distributed capacitances between overhead transmission lines and between conductors and the earth. Excessive accumulation of capacitance will reduce the quality of power supply voltage for users, and in serious cases, it will damage insulation and burn electrical equipment. The characteristics of inductance and capacitance are just opposite, so reactors (inductors) can be installed in the power grid to compensate.
This is the most basic, but there are actually many applications.
What does inductance 77 120 mean?
Power inductance,