Compact Fluorescent Light | Electronic Project Circuits

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14 Watt Compact Fluorescent Electronic Ballast

This circuit came from a 14 Watt Commercial Electric spiral bulb from Home Depot. It is very similar to a 16 Watt circuit on repairfaq.org. In fact, I drew it in that way because it was layed out very well, so much credit should go to Sam Goldwasser.

As the power comes in, it is filtered by L1 and a .1uF capacitor. A .47 Ohm reisitor is also provided and is probably fusible. It is then rectified by the bridge formed by D1-D4 and filtered by a 10uF capacitor. As power is first applied, a 100nF 63V capacitor begins charging through a 470k reisitor. Once this capacitor reaches 32V, the DIAC breaks over turning on Q2. Power then flows through Q2, the top winding of T1, L2, a filament of fluorescent bulb FL1, a 4.7nF capacitor, the other filament of FL1, and a .1uF capacitor, current being limited by L2 and the resistance in the filaments. Transformer action also begins inducing power in the other 2 windings of T1. This tends to begin to turn on Q1 and turn off Q2. Once Q1 is on, the charge that has built up in the .1uF and 4.7nF capacitors attached to FL1 begins flowing back the other way through the filaments, L2, the top turn of T1 and Q1. This once again induces power into the other two windings of T1 except in the opposite direction, eventually turning off Q1 and turning on Q2. The 470pF capacitor and other 470k resistor apparently make sure that both transistors are not on at the same time. Otherwise, it would be a dead short! Once the arc starts, most of the current flows directly between the filaments instead of through them. Only a small amount flows through them to keep them warm.

Read More Source: http://silenceisdefeat.org/~lgtngstk/Sites/tls.html
Thank you.

1 comment - What do you think? Posted by admin - April 2, 2008 at 9:30 am

Categories: Lighting Tags: compact fluorescent light, Electronic Ballast, fluorescent lamp

12v Fluorescent Inverter by TIP3055

This is a low-cost project for 20 or 40 watt fluorescent tubes. However the most efficient is to use a 40 watt tube (or two 20 watt tubes in series). It’s a circuit you can put together from junk box components or build from a kit. It’s very simple to build and requires no printed circuit board.
The transformer is hand-wound on a ferrite rod (from an old transistor radio) and the winding wire can be salvaged from an old transformer.

Read more Source:
http://www.talkingelectronics.com/te_interactive_index.html
Thank you.

Be the first to comment - What do you think? Posted by admin - March 5, 2008 at 4:40 pm

Categories: Inverter, Lighting Tags: compact fluorescent light, fluorescent lamp, inverter fluorescent light

Tubelight Electronic Choke

This is an electronic choke for a Conventional Fluorescent Lamp. This was an application note of MJE13005 a High Voltage Switching NPN Power Transistor. I Might have modified it. This was very popular in the early days, The Coil Winding and Ferrite is very Critical design.

The diodes, npn transistor and caps are high voltage 350V-1KV, The tubelight is 40W-60W 5 feet long. This circuit replaced the choke and starter in an existing frame.

Read More Source: http://www.electronics-circuits.com/schematics/arc20070107.html
Thank you.

Be the first to comment - What do you think? Posted by admin - February 6, 2008 at 11:39 am

Categories: Inverter, Lighting Tags: compact fluorescent light, fluorescent lamp