Electronic ballasts. How to light a fluorescent lamp. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Electronic ballasts. How to light a fluorescent lamp. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Ballasts for fluorescent lamps

That light a lamp, you need to warm up its electrodes. Since there is no starter in the electronic ballast circuit, it is necessary to somehow initially close the power circuit so that the flowing current warms up the electrodes, and then turn off the start circuit.

In low power lamps (units of watts), the initial closing of the circuit can be carried out using capacitor C. However, this path is rather contradictory, since it is desirable to have as large a capacitance as possible for heating, while this capacitance cannot be chosen too large for a good resonant effect.

The developers did the following. They connected in parallel with the capacitor a thermistor with a positive temperature coefficient PTC - posistor. In a cold state, the resistance of the posistor is small, and the current heats up the lamp electrodes. Together with the electrodes, the posistor also heats up.

At a certain temperature, the resistance of the thermistor rises sharply, the circuit breaks, and the inductive surge lights the lamp. The posistor is shunted by the low resistance of the burning lamp. The use of a posistor allows the lamp to light up smoothly and reduces electrode wear, which extends the lamp life up to 20 thousand hours.

There is also cathode preheating method (more progressive), which consists in the fact that when warming up, the driver frequency is higher than the resonant frequency of the lamp supply. As a result, the lamp first warms up and only after the driver frequency drops to the resonant one, it is ignited.

Author: Koryakin-Chernyak S.L.

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Comments on the article:

Nicholas
I liked the electronic ballast article using the IR2520D, but it will be possible to speak in more detail after testing, i.e. after assembly, it is desirable to add what power fluorescent lamps can be lit using this microcircuit. What needs to be changed in the circuit so that electronic ballasts can be used for common 18,36,60 watt lamps. Correct in the text the socket for the microcircuit is not 18, but 8 Pin. If you write information about simple things on sites, you need to share kindly and not be greedy that someone will rewrite and solder everything. If you go to sites with what you managed to do, you should rejoice and achieve repeatability .This is general knowledge and a different theme of inclusion.

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