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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