The inductor can be made of 人錯a coiled core of electrically conduct水得ive material, typically a 舞長copper wire, or the core can b西愛e removed or replaced with a 拿要ferromagnetic material. A core material討場 having a higher magnetic permeabili亮人ty than air can tightly co水唱nstrain the magnetic field around th們近e inductance element得花, thereby increasing空得 the inductance. There are many 雪家types of inductors, most of 黃也which are made of an out件就er enamel coated wire around a ferrit們不e bobbin, and some protective in年術ductors place the coil completely ins鐵森ide the ferrite. The core of so內林me inductive components 用月can be adjusted. This can change the si資分ze of the inductor. Smal司視l inductors can be etched d們看irectly onto the PCB, 飛樹using a method of laying spir林藍al traces. Small value inductors can就刀 also be fabricated in integrated c票分ircuits using the same process of fabri相這cating transistors. In the議藍se applications, aluminum 熱醫interconnects are often us商知ed as conductive materials. Reg能間ardless of the method used筆視, the most practical appl慢做ication of constraints is 慢金a circuit called a "去黑rotator" that uses a capacitor and a哥讀ctive components to exhibit the s年間ame characteristics as an吧放 inductive component. Inductive com船謝ponents for high frequency isolatio中又n often consist of a wire tha公區t passes through a magnet的月ic column or magnetic bead.
Small inductor
Small fixed inductors are usually路拿 wound directly on the core with an en分靜ameled wire.
Mainly used in circuits such她化 as filtering, oscillation, notching,們開 delay, etc. It is availa技船ble in both sealed and unse司腦aled packages. Both forms have both v了制ertical and horizontal 美木profiles.
1. Vertical sealed fixed inductor The還習 vertical sealed fixed inductor ad媽金opts the same-direction pin. The dome說新stic inductance range 兵光is 0.1~2200μH (straight mark 是要on the outer casing), the 劇內rated working current is 0.05~1.6A, a秒呢nd the error range is ±員那 5%~±10%, the inductance of the import麗來ed, the current range得開 is larger, and the error i筆如s smaller. Imported TDK series color c歌錯ode inductors, the indu冷學ctance of which is marke靜他d on the surface of th裡不e inductor with color points.
2, horizontal sealed fixed inductor 一話Horizontal sealed fixed 人火inductor with axial type pins, d爸去omestically produced LG1.LGA, LGX件很 and other series.
Inductance of LG1 series inductors rang紙分es from 0.1 to 22000μH (stra輛紅ight on the housing)
The LGA series inductors ar輛亮e ultra-small and simila煙紙r in appearance to 1/2W co間低lor ring resistors. The遠門 inductance ranges from 0.22 t鐵湖o 100μH (marked on the housin時靜g with a color ring) and機數 the rated current is 0.09~0男議.4A.
LGX series color code inducto光校rs are also small packa多低ge structures with inductance r都兵anging from 0.1 to 10000μ鐵離H and rated currents of 50mA,遠時 150mA, 300mA and 1.6A.
Adjustable inductor
Commonly used adjustab我理le inductors include a小美n oscillating coil for a 冷票semiconductor radio and a line osci術制llating coil for a television set車長.
Linear coils, intermediate frequency tr黃通ap coils, acoustic fre木志quency compensation coils嗎間, wave blocking coils, etc.
1. Oscillation coil 錢道for semiconductor radio: This oscilla林動tion coil is composed of 時討a local oscillator circu輛用it in a semiconductor rad務車io and a variable capacitor to 上月generate a local signal 費體of 465 kHz higher than the習也 radio signal received by the上月 input tuning circuit. Th年站e outside is a metal shield, and the i鐘能nside is composed of a nylon lin木兒ing, an I-shaped core, a magnetic林物 cap and a lead seat. The win喝她ding of the high-strength enamel放低ed wire is used on the I-shaped core.票紙 The magnetic cap is mo錯姐unted on a nylon frame i水店n the shield, and can be 花鄉rotated up and down to change the 山雪inductance of the coil by changing 作但its distance from the co體美il. The internal structure of th開黑e TV IF notch coil is 但對similar to that of the oscillating co紅長il, except that the magnetic cap has a 見如tunable core.
2. The oscillating coil for TV: 唱志The oscillating coil i路去s used in the early black-and-whit話快e TV. It consists of a self個科-excited oscillating circuit with a pe煙長ripheral RC and a oscillating tran河如sistor (three-point oscillat妹是or or intermittent oscil放算lator, multi-resonant自放 ,) used to generate a rect來高angular pulse voltage sig知分nal with a frequency of 15625關下HZ.
The center of the core of the coil ha視分s a square hole, and the line s房制ynchronization adjustment場拿 knob is directly inserted into the squ家歌are hole, and the sy數樂nchronous adjustment knob低窗 is rotated to change the re音很lative distance betwe嗎來en the core and the coil, t有分hereby changing the i河費nductance of the coil and mai商都ntaining the oscillation frequency of t都知he line. For the 15625HZ, the li兵門ne sync pulse sent by t亮時he automatic frequency control 著也circuit (AFC) generates synchro老你nous oscillation.
3. Linear coil: The linear coil is 船路a nonlinear magnetic satura員愛tion inductor (the inductance decrea飛相ses with the increase o花西f current). It is gener線計ally connected in series in t鐵城he line deflection c腦嗎oil loop and compensated by its 大如magnetic saturation char麗師acteristics. Linear distortion腦農 of the image.
The linear coil is wound on th術如e "work" type ferrite high-frequency c的村ore or ferrite rod w海愛ith an enameled wire務日, and an adjustable permanent magne風草t is arranged beside the co要電il. The linear inductance is ac懂就hieved by changing the relative吧要 position of the perman子也ent magnet and the coil妹劇 to change the inductance 數好of the coil.
Blocking inductor
A choke inductor is an inductive coil光土 used in a circuit to block an AC cu理微rrent path.
It is divided into a拍她 high frequency choke co影藍il and a low frequency ch行下oke coil.
1. High-frequency choke coil: The high來信-frequency choke coil is also called h事文igh-frequency choke coil, which is 東購used to prevent high-frequency AC cur習師rent from passing.
The high-frequency choke coil works in匠區 the high-frequency circuit, an章劇d the hollow core or ferrite high-fre長暗quency core is mostly used. The朋理 skeleton is made of ceramic m都窗aterial or plastic, and the coil is wo路刀und by a honeycomb type or 人姐a multi-layer flat winding.
2, low-frequency choke些通 coil: low-frequency choke coi民那l is also called low-frequency choke c服森oil, it is applied to current circuit, 近湖audio circuit or field outp理會ut circuit, its role is to prevent low-謝綠frequency AC current throu了從gh.
Generally, the low frequency choke事放 coil used in the audio circ懂廠uit is called an audio c筆弟hoke, and the low frequency choke coil 在男used in the field output circu物說it is called a field choke, an銀身d the low frequency ch校笑oke coil used in the current 窗飛filter circuit. It is called事鄉 a filter choke.
The low-frequency choke coil gener分長ally adopts an "E"-sh男醫aped silicon steel sheet core窗花 (commonly known as a靜暗 silicon steel sheet core), a p請遠ermalloy core or a ferrite core. 靜答In order to prevent m你技agnetic saturation caused by lar請不ge DC current, proper clearan很放ce should be left in the錢做 core during installation.
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