A CCFL inverter drives a gas-filled tube to produce light without preheating. It generates high frequency audio electricity and uses a Royer oscillator to monitor energy fed to the CCFL. CCFLs are used for indoor lighting and backlighting of LCDs, and different colors are possible due to different types of gas. Early fluorescent tubes required preheating with a tungsten filament and a passive starter.
A cold cathode fluorescent lamp (CCFL) inverter is an electronic circuit that drives a CCFL, a gas-filled tube designed to produce light when the gas fill is ionized by electric currents through the main terminals and through the gas inside of the tube. The CCFL inverter is also used for advertising boards and decorative lighting and is very common in vehicles that supply 12 volts (VDC) direct current from the battery or 13.8 VDC when the engine is running. It generates high frequency audio electricity using ferrite transformers which are most efficient at the given operating frequency. Cold cathode devices do not require preheating unlike hot cathode devices which use a directly or indirectly heated cathode. The CCFL may or may not have trigger terminals that initiate current from the cold start.
An inverter is an electrical energy conversion device that inputs direct current (DC) and generates alternating current (AC). The CCFL inverter is a special inverter that generates the higher AC voltage used by a cold cathode fluorescent lamp. In addition, the CCFL inverter also provides the necessary current limit without which the CCFL will overheat and fail.
The Royer oscillator generates a sine wave output used to power a CCFL. It is a highly efficient oscillator, making it a popular circuit for battery-operated CCFL drivers. The Royer oscillator uses two main analog current controllers that generate alternating current through a transformer. Royer oscillators use a feedback system that allows the main circuit to monitor the amount of energy being fed to the CCFL. This way, there is a stable brightness level on the CCFL.
CCFL inverter circuits are used for indoor lighting and backlighting of liquid crystal displays (LCDs). The sine wave output in the CCFL inverter is clean and does not interfere with radio reception. For example, if the CCFL inverter produces too much electromagnetic interference, it may interfere with electronic receiver operations such as radio and television broadcasts.
The various colors available for CCFL are made possible by different types of gas within the CCFL tubes. Some CCFL tubes are gas filled with an ultraviolet (UV) producing gas such as mercury vapor. The UV energy created then energizes a fluorescent coating within the tube to produce light.
Fluorescent tubes come in cold cathode and hot cathode varieties. Early fluorescent tubes were preheated using a tungsten filament which can be temporarily preheated by a device known as a passive starter, which senses the voltage across the tube. If this is too high, the starter allows current to flow through it, causing current to flow through the filaments. This produces preheating and eventual current flow through the tube.
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