What is the throttle and what is it for ?

construction and operation

First of all, let's talk about what is in the circuit element and how it works.Schemes designation throttle following:

appearance of this product may be like in the photo:

This coil of wire wound around a core with a magnetic or without housing in the case of high frequencies.Similar to a transformer with only one winding.A brief physics, the current in the coil can not instantaneously change.We carry out a thought experiment - we have AC, the oscilloscope, the choke.

During the early waves of the floor, we are witnessing the growth of the current late, this is due to the induction of the magnetic flux in the core.There is a gradual increase in the current in the coils when an AC source signal goes into recession, we are witnessing the decline of current in the inductor, again with some delay, since the magnetic field in the yoke continues to push the current in the coil, and can not quickly change its direction.Obtained in some point from the current counteracts external source current, the induced magnetic core choke.In AC circuits the appointment of the throttle - stop performing or inductive reactance.

to the DC circuit element is not resistance or regulatory element.This effect is used for devices in electric circuits where it is necessary to limit the current to the desired value while avoiding excessive bulkiness and heat.

interesting explanation on this issue, you can also view the video:

Scope

Throttle is designed to makeour life brighter.Specifically, the fluorescent lamps it limits the current through the flask to a desired value, avoiding excessive increase through the valve.

Fluorescent lamp mainly consists of the throttle, starter, fluorescent lamp.In a nutshell description of fluorescent light occurs so:

From mains current through the inductor goes to one of the fluorescent lamp filament yarn, then gets on the starter unit, then to the second filament, and leaving the network.The starter plate of the bimetal device is heated by glow discharge gas is rectified by the action of heat and closes the circuit.At this point, they begin working filament bulb on the ends, heating the mercury vapor in the bulb of a fluorescent lamp. After a short time, in a starter plate cools and returns to its original position.During the open-circuit voltage is a sharp spike in the throttle, the gas sample in the bulb of a fluorescent lamp, and the glow discharge occurs, the light begins to shine, working lamp bypasses the starter, turning it from a chain of lower resistance.

In electronic circuits the current economic fluorescent lamps also have considered to be part of, but because of the higher frequency it has a miniature size.A principle of operation and purpose are the same.

mandatory element also choke circuits DRL lamps, sodium HPS lamps, metal halide bulbs CDM.

In the switching power supply circuits in inverters appointment of throttle - to block the sharp spikes of the transformer, passing the smoothed voltage.Roughly speaking, in this case it acts as a filter.

they are also installed in electric networks, but are called reactors.Appointment arcing reactor - to prevent the emergence of an independent arc during a single-phase short circuit on the ground, as well as the other reactors, which somehow regulate or limit the amount of current through them specifically or in case of emergency.

With the throttle is possible to improve a cheap or homemade welding machine by setting it in the secondary circuit.Welding transformer is assembled with the throttle will cook better than branded devices, the arc will be smooth and will not tear seam is evenly filled.

Arson arc will be much easier and drawdown line voltage will be less impact on the appearance and arcing.Even a layman can quickly achieve good results in welding, making all sorts of crafts at home.

So we looked at the throttle device working principle and purpose.We hope that now you are fully understood, why there is this element of the scheme!

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