IMPLEMENT DIMMING METHOD FOR HOT CATHODE FLUORESCENT LAMP USING A RESONANT INVERTER

• This article describes a dimming method for hotcathode fluorescent lamp (HCFL) using a resonant inverter operating at fixed switching frequency. 
• The proposed method is based on burst dimming and decreases the inverter output voltage during the burst-off period by changing the switching pattern of the inverter.

A DIMMING METHOD FOR HOT CATHODE FLUORESCENT LAMP USING A RESONANT INVERTER OPERATING 

•  Consequently, the lamp can be turned OFF, while the filaments of lamp are kept preheated without adding an inverter for preheating.
•  Once the lamp is turned OFF, N-times resonant mode (where N means a natural number) occurs because the characteristic of the resonant circuit (which depends on lamp impedance) changes drastically.
•  This mode keeps the root mean square of filament currents large enough to ensure long lamp life. Moreover, the inverter operates in zero-voltage-switching resonant mode during both the burst-on and burst-off periods. 
•  The proposed method thus contributes to achieving long lifetime, small size, and low cost of lighting system for HCFLs. 

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