Title :
A comparative study on dimming control methods for electronic ballasts
Author :
Ho, Y. K Eric ; Lee, Stephen T S ; Chung, Henry Shu-Hung ; Hui, S.Y.
Author_Institution :
S&V Lighting Ltd., China
fDate :
11/1/2001 12:00:00 AM
Abstract :
This paper presents a comparative study on the performance characteristics between the variable switching frequency and variable DC link voltage control schemes for the dimming operation of electronic ballasts using a half-bridge series-resonant parallel-loaded inverter. Attributes under investigations include (1) average input current of the inverter; (2) dimming characteristics; (3) variations of the filament power and starting voltage throughout the dimming range; (4) dead time boundaries for ensuring zero-voltage-switching in the inverter. An approximated fundamental-frequency model that includes the characteristics of the nonlinear lamp resistance and filament resistance is used. Theoretical predictions are favorably verified with the experimental measurements in two 36 W Ballast-lamp systems
Keywords :
bridge circuits; electric resistance; fluorescent lamps; frequency control; invertors; lamp accessories; lighting control; switching circuits; voltage control; 36 W; dead time boundaries; dimmable electronic ballasts; dimming control; dimming operation; electronic ballasts; filament power; filament resistance; fluorescent lamps; fundamental-frequency model; half-bridge series-resonant parallel-loaded inverter; illumination control; inverter average input current; nonlinear lamp resistance; starting voltage; variable DC link voltage control; variable switching frequency; zero-voltage-switching; Electric variables control; Electromagnetic interference; Electronic ballasts; Fluorescent lamps; IEC standards; RLC circuits; Resonance; Resonant inverters; Switching frequency; Voltage control;
Journal_Title :
Power Electronics, IEEE Transactions on
