Detail of choke for fluorescent lamps

30 april 2017, 19:25

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Design of a fluorescent lamp is that without the ballast it would be very difficult to organize its work. This was previously used electromagnetic ballast or Ampra a key element of the throttle and today it was replaced by a more sophisticated variant of the electronic ballast unit electronic ballast. In spite of this today still in the course of both types of devices.


The throttle used less perhaps in time it will be extinct as unnecessary. After connecting a discharge lamp in such a way is the main scope of the instrument. The choke plays a crucial role in the operation of fluorescent lamps as it creates suitable conditions for operation of the lighting device of this type hinders the increasing current at a certain level which allows to maintain a sufficient voltage on the electrodes in the bulb.

This feature transfers the throttle in the discharge of ballast. In addition, the wiring diagram of a fluorescent lamp contains another element starter. He is responsible for the open circuit.

This leads to a self-induced EMF in the inductor which in turn contributes to the increase of voltage to 700-1000V. The result of these processes is the breakdown and incorporation of a fluorescent lamp.

A throttle device for discharge lamps is quite simple in fact it is the inductor with a ferromagnetic core. Such a device is only used if the scheme provides for the connection of the lamp using electromagnetic ballast apparatus. An electronic BALLAST includes in its design the stabilizer and frequency Converter, these elements allow you to turn on the light so as to implement the function of choke and starter.

To answer the question why you need a choke is recommended to first understand how it works. When included in the circuit occurs a phase shift between the main electrical parameters voltage and current. This lag is determined by such characteristics as cosφ the power factor. In determining the estimated values of the active component of the load is taken into account this value. A higher power factor increases a small load level. So the scheme include a condenser with a compensation function.

Using this element 3-5 UF at the connection of fluorescent lamps with power up to 36 watts is possible to increase cosφ of up to 085. The minimum limit of the power of fluorescent lamps in this case 18 W. the capacitance of the capacitor for light sources 18 W and 36 W may be the same. Level tolerated by the throttle load has to match the power of the light source.

There are several versions of such devices each of which differs in size and power losses

The principle of operation of the throttle suggests the consumption of the power not for its intended purpose and in heating of the device. Useful work not performed and hence the level of losses determines the efficiency of functioning of the higher this value the more heated the throttle to connect a fluorescent lamp.

Despite the fact that today, the popularity of Ampro decreased significantly, such devices are still used. This is due to several advantages

Thanks to the last factor of the above ballast electromagnetic type with throttle still being used today. In addition, these devices are easy to install and uncomplicated operation.

If there are problems in the operation of lamps connected through a choke for example they do not include checked the circuit for errors and the quality of the connection, the connection wire breaks.

In the case when there is no apparent reason you should inspect the choke. This can be done by plugging in a working lamp. When you open the light source is not lit when you turn the circuit shines at full strength. Normal mode dimly.

Wiring diagram of lamps of this type using the starter and choke as follows

Wiring diagram to power supply

You can choose the compensation capacitor or without him, it all depends on the power factor. On what type of starter is used will depend on the number of connected lamps sequentially

Assumed that without a right you cannot enable gas discharge lighting device. It is not so. If you change the schema of the throttle-free connection to perform quite real. To ensure the normal working conditions of fluorescent light source, the voltage should be doubled and rectified for which the scheme is being introduced rectifier. Instead of ballast is a miniature incandescent lamp is a resistor or a capacitor for this purpose is not suitable.

Directly connection diagram using a light source with a filament and rectifier

Therefore, discharge lamps, in particular fluorescent performance will work if you provide them ballast. Depending on its type of electronic or electromagnetic option can provide different levels of lighting efficiency. Empra includes a choke and a starter.

The first of the elements creates normal conditions for the functioning of the light source constrains the operating current at a certain level it is therefore considered that without it the lighting will not work. But there is an alternative power supply circuit without a choke but with twice the voltage of the power supply.

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