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2.2 Starter types
Fig. 106. Working principle of a glow- discharge starter circuit.
1.The heat from the discharge in the starter bulb causes the bimetallic electrodes to bend together.
2.When the bimetallic electrodes make contact, a current starts to flow through the circuit, sufficient for preheating the electrodes of the fluorescent lamp.
3.The bimetallic electrodes cool down and open again, causing a voltage peak, which ignites the fluorescent lamp.
starting process again until the lamp ignites. If the lamp will not ignite (end of life) the starter will continue producing peaks (flickering) until the mains voltage is switched off or until the electrodes of the glow- switch starter stick together. In the latter case the
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Once the lamp is properly ignited, the lamp voltage is too low for a glow discharge between the starter electrodes. So these electrodes stay ‘cool’ and in open position.
A capacitor across the starter electrodes prevents
There are five types of
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