The purpose of inductance coil

                                                  The purpose of inductance coil

The purpose of inductance coil is divided into three kinds, choke, filter, oscillate

Choke: Used in low-frequency circuits to block low-frequency AC; pulsating DC to pure DC 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 Π filter circuit. In the high-frequency circuit: It is the high-frequency choke in the old regenerative radio to prevent the high-frequency current from flowing to the low-frequency end; it is used.

Filtering: The same as the above theory; it also prevents the rectified pulsating DC current from flowing to a pure DC circuit. It is composed of a choke (to simplify the circuit and reduce the cost, replace the choke with a pure resistance) and two capacitors (electrolytic capacitors). Circuit. The use of capacitor charging and discharging functions and the direct current of the choke coil, blocking the characteristics of the alternating current to complete the smooth direct current and obtain the pure direct current.

Oscillation: 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 dozens of GHZ. It is widely used in wired power and radio fields.

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