Application industry and scope of power inductor

The commonly used adjustable power inductors are oscillation coil for semiconductor radio, line oscillation coil for TV set, line linear coil, intermediate frequency notch coil, frequency compensation coil for audio, wave resistance coil and so on.

1. The oscillation coil is used in the semiconductor radio to form a local oscillation circuit with a variable capacitor in the semiconductor radio to generate a local oscillator signal that the radio signal received by an input tuning circuit is higher than 465kHz. The outside is a metal shield, and the inside is composed of nylon liner, I-shaped magnetic core, magnetic cap and pin seat, etc., and there is a winding with high strength winding on the I-shaped magnetic core. The magnetic cap is installed on the nylon frame in the shield and can rotate up and down, and the inductance of the coil can be changed by changing its distance from the coil. The internal structure of the mid-frequency notch coil of the TV set is similar to that of the oscillating coil, except that the magnetic cap is adjustable.

two。 The line oscillation coil for TV set was used in the early black-and-white TV set. It formed a self-excited oscillation circuit (three-point oscillator or intermittent oscillator, multi-harmonic oscillator) with peripheral resistance-capacitance elements and row oscillation transistors, which was used to generate rectangular pulse voltage signals with frequency of 15625HZ. The magnetic core of the coil has a square hole, and the synchronous adjusting knob is inserted directly into the square hole. By rotating the synchronous adjusting knob, the relative distance between the magnetic core and the coil can be changed, thus the inductance of the coil can be changed, and the line oscillation frequency can be kept as power inductor-patch inductor-wound inductor-inductor coil-inductor manufacturer-electronic news HZ. Synchronous oscillation is generated with the row synchronous pulse fed by the automatic frequency control circuit (AFC).

3. Line linear coil (its inductance decreases with the increase of current), it is generally connected in series in the row deflection coil loop, and its magnetic saturation characteristic is used to compensate the linear distortion of the image.

The line linear coil is made of enamelled wire wound on the "I" type ferrite high frequency core or ferrite rod, and an adjustable permanent magnet is arranged next to the coil. The inductance of the coil is changed by changing the relative position of the permanent magnet and the coil, so as to achieve the purpose of linear compensation.