This invention describes a self-oscillating electronic ballast with dimming control for fluorescent lamps such as induction electrodeless lights (IEFL). The proposed ballast is able to carry out dimming control and self-start with no need of auxiliary circuits and with a minimum number of external components.
This invention describes a control circuit for self-oscillating autonomous or embedded electronic ballasts of application in fluorescent lightssuch as induction electrodeless lamps (IEFL). Although there is a considerable amount of previous literature describing self-oscillating ballasts, the present invention provides full functionality and dimming control with no need of startup circuits or additional magnetic elements. The control system can be included in an integrated circuit and the current sense transformer is of minimum size. The chief advantages in the realization of electronic ballasts are that lighter, smaller and cheaper devices could be developed with this approach.
Current development status
The invention has application as stand-alone or integrated ballast for induction electrodeless fluorescent lamps. Self-oscillating control has been employed previously to reduce the complexity and cost of the ballasts, but dimming control for those circuits remains to be disadvantageous. So far, dimming in self-oscillating ballasts has been achieved with help, for example, of additional magnetic elements which are heavy and bulky. Our invention employs logic circuits in order to ensure self-oscillation and provides a simple, effective, and low-cost dimming control.
Desired business relationship