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What's the Electromagnetic Chokes?
2014-04-14 18:06:44

Magnetic chokes use magnetic components to start and regulate the operation of a lamp. 

Inductors are used as the current limiting component in EM ballasts. Although the inductor is very 
good at regulating current, it causes a phase shift input of the current waveform creating a nonideal power factor. Often times a Capacitor is used in Magnetic chokes to correct the power 
factor. A few of the most common Magnetic chokes are shown below.
A Magnetic chokes is a part used in electrical circuits to allow DC current to flow through while blocking AC current from passing. These coils are used in a number of electrical devices. When used as part of a radio’s circuitry, it falls into one of two frequency classes: audio or radio. Those used in circuits with higher frequencies use different core materials than those used in lower frequency circuits.
During the process of sending a signal through a circuit, the idea is to let the desired signal go through while filtering out other, unwanted signals. One type of unwanted signal is common-mode noise, which is filtered out by a common-mode Magnetic chokes. Power lines are an example of a source of common-mode noise. Without a coil, the power line would create a lot of electrical noise as it traveled to its destination, which would then be received on the other end and possibly cause interference with the signal.
The HPS ballasts works because it acts as an inductor. When the current passing through changes, as AC currents do, it typically creates a magnetic field in the coil that works against that current. This property, known as inductance, blocks most of the AC current from passing through. As a result, currents that do not change, such as DC currents, can continue through while those that do are blocked by the very magnetic field they created.

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