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Flicker-free triac-dimmable CFLs

Authored on: Aug 29, 2012

Technical Paper / Product Paper

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Many compact fluorescent lamp (CFL) triac dimmer solutions currently use a simple 'PI' circuit to control the lamp's voltage and current. The circuit consists of a proportional (P) part and an integrating (I) part. However, stability issues at deep dimming levels can cause the lamp to flicker, so these solutions typically limit dimming to about 20-30%. Adding a differential element to the PI circuit can keep the circuit stable and hence avoid flickering even at much lower dimming levels. By combining these elements to create a complete 'PID' controller network, NXP's GreenChip UBA2027x family of CFL drivers enable flicker-free deep dimming down to 2%.
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MarkFromNJ Posted Sep 1, 2012

Great article, but Preview on OS/X and Adobe Reader on both OS/X and Windows 7 can't display the circuit image on page 1 of the white paper. Seems there is a problem with the pdf. Anyone else have this problem?

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WKetel Posted Sep 6, 2012

Even windows explorer is not able to show the circuit, or possibly none is provided. But the 2 or 3 extra parts to make it nicely dimmable are a very few cents in the multi-dollar cost of a dimmable CFL. So whay not let folks know that the circuit is dimmable.

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