The purpose of inductor coil

The purpose of inductor coil

The purpose of inductor coil is divided into three kinds: choke, filtering, oscillate

1. Choke: Used to block low-frequency AC in low-frequency circuits; 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.

2. Filtering: The same as the above theory; it also prevents the rectified pulsating DC current from flowing to a pure DC circuit. The circuit consists of two capacitors (electrolytic capacitors), which are choke coils (to simplify the circuit and reduce costs, use pure resistance instead of the choke coil).式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.

3. Oscillate: We say that rectification is to turn alternating current into direct current, so oscillation is the reverse process of turning 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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