![]() A rectifier circuit designed for a choke-output filter may produce too much DC output voltage and subject the rectifier and filter capacitors to excessive in-rush and ripple currents if the inductor is removed. They are commonly found in direct-current motor controllers to produce direct current (DC), where they were used in conjunction with large electrolytic capacitors to remove the voltage ripple (AC) at the output DC. Chokes were frequently used in the design of rectifier power supplies for vacuum tube equipment such as radio receivers or amplifiers. The iron core increases the inductance for a given volume of the core. They are often constructed similarly to transformers, with laminated iron cores and an air gap. Radio frequency chokes (RFC) – designed to block radio frequencies while allowing audio and DC to pass.Īudio frequency chokes (AFC) usually have ferromagnetic cores to increase their inductance.Audio frequency chokes (AFC) – designed to block audio and power line frequencies while allowing DC to pass.Inductors designed for use as chokes are usually distinguished by not having low-loss construction (high Q factor) required in inductors used in tuned circuits and filtering applications.Ī ferrite "bead" choke, consisting of a cylinder of ferrite encircling a computer power cord to block electronic noise.Ĭhokes are divided into two broad classes: It is a functional name the name "choke" is used if an inductor is used for blocking or decoupling higher frequencies, but the component is simply called an "inductor" if used in electronic filters or tuned circuits. The name comes from blocking-"choking"-high frequencies while passing low frequencies. Its low electrical resistance passes both AC and DC with little power loss, but its reactance limits the amount of AC passed. The choke's impedance increases with frequency. A choke usually consists of a coil of insulated wire often wound on a magnetic core, although some consist of a doughnut-shaped "bead" of ferrite material strung on a wire. In electronics, a choke is an inductor used to block higher-frequency alternating currents (ACs) while passing direct current (DC) and lower-frequency ACs in a circuit. ![]() Common-mode choke with two 20 mH windings and rated to handle 2 amperes
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |