Ccfl driver circuit

Geisha A. Legazpi A LCD screen with CCFL inverter circuits. 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 filling is ionized by electrical currents through the main terminals and through the gas inside the tube.. The CCFL inverter is also used for advertisement boards and . CCFL efficiency is greatly affected by the current waveform driving the lamp. Sinusoidal waveforms provide the greatest efficiency. Conversely, nonsinusoidal waveforms with large crest factors are not efficient CCFL drivers. Figure 4 shows two current waveforms with approximately the same RMS current. Although the high-crest-factor waveform has the same RMS current as the sinusoidal . The invention claimed is: 1. A cold cathode fluorescent lamp (CCFL) driver circuit comprising: more than one ballast, at least one of which is connected to at least an electrode at one end of each of more than one CCFL; and a low-impedance power supply powering said CCFL through said ballast and having an output impedance lower than the total impedance of said CCFLs.

CCFL drivers may seem straightforward but they're high-frequency, high-voltage circuits and there are many traps for young (and old) players. Edit: Also, try to beg, borrow or steal an oscilloscope. It would be a huge help. Design goals for a Cold Cathode Fluorescent Lamp (CCFL) converter used in a notebook computer or portable application include small size, high effi-ciency, and low cost. The UCC/3 CCFL controllers provide the neces-sary circuit blocks to implement a highly efficient CCFL backlight power supply in a small footprint 8 pin TSSOP package. a CCFL is only present for the instant it is required. High voltage corona discharge, which gradually destroys insulation material, can be more easily avoided with Direct Drive designs (see the detailed description of strike voltage generation bel ow). Microsemi has d eveloped completely n ew trans formers to be used with our LX control IC.

Capacitor Co is inserted in series with the CCFL in this circuit. This capacitor Co allows the output voltage from the transformer to be applied directly to. The next generation's inverter technology for the CCFL Lighting is the current resonance type inverter circuit. The resonance current which causes at the. A CCFL inverter is a module or a device in a circuit that provides the power supply to a cold cathode fluorescent lamp (CCFL). It is called an inverter.