Flow blocking effect:
The self-induced electromotive force in the coil is always opposed to the current change in the coil. Mainly can be divided into high-frequency choke coil and low-frequency choke coil.
Tuning and frequency selection function:
The inductance coil and the capacitor are connected in parallel to form an LC tuning circuit. That is, the natural oscillation frequency f0 of the circuit is equal to the frequency f of the non-AC signal, and the inductance and capacitive reactance of the loop are also equal, so the electromagnetic energy oscillates back and forth between the inductance and the capacitance. This is the resonance phenomenon of the LC loop. During resonance, since the inductance and capacitive reactance of the circuit are equal and opposite, the inductance of the total current of the loop is the smallest and the current is the largest (referring to the AC signal of f=f0), so the LC resonance circuit has the function of selecting the frequency and can An AC signal of a certain frequency f is selected.
Choke:
It is used to block low-frequency alternating current in low-frequency circuits; pulsating direct current flows to pure direct-current circuits; it is commonly used in the middle of two filter capacitors at the output of a rectifier circuit. The choke and capacitor form a filter circuit. In the high-frequency circuit: to prevent the high-frequency current from flowing to the low-frequency end, the high-frequency choke in the old regenerative radio is used.
Filtering:
It also prevents the rectified pulsating DC current from flowing to the pure DC circuit. The choke (in order to simplify the circuit and reduce the cost, replace the choke with a pure resistance) and two capacitors (electrolytic capacitors) form a Pie filter circuit. The use of capacitor charging and discharging and the direct current of the choke coil to block the characteristics of the alternating current to complete the smooth direct current and obtain the pure direct current.
Shock
We say that rectification is to change alternating current into direct current, so oscillation is the reverse process of changing direct current into alternating current. We call the circuit that completes this process an "oscillator." The waveform of the oscillator: there are sine wave, sawtooth wave, trapezoidal wave, square wave, rectangular wave, spike wave. The frequency ranges from a few Hz to tens of G Hz. It is widely used in the field of wired power and radio.
The self-induced electromotive force generated by the inductance element always prevents the current in the coil from changing, so the inductance element has resistance to alternating current, and the resistance is measured by the inductive reactance XL. The inductance XL is related to the frequency of the alternating current and the magnitude of the inductance. This relationship of inductive reactance can be expressed by the following formula, namely:
K=2Ï€fl
In the formula: f——AC frequency
L-the inductance of the inductive component
It can be seen from the above formula that the XL of the inductance element is small at low frequencies. When the direct current is passed, since f=0, XL=0, only the DC resistance of the coil works, so the resistance is very small, which is similar to the short circuit of the inductance element. Therefore, the inductive component is generally not used in the DC circuit for its inductive reactance performance. When the inductive component works at high frequency, XL is very large, which is almost an open circuit. This characteristic of inductance components is exactly the opposite of that of capacitors. Therefore, various high-frequency and low-frequency filters, tuning circuits, frequency selection circuits, oscillation circuits, compensation circuits, delay circuits, and chokes can be formed by using inductors and capacitors, which play an important role in the circuit.
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