Abstract
This
paper proposes a phase-locked loop (PLL) control scheme for the electronic
ballast with a current-equalization network. The PLL control
scheme involves detecting the phase signals of both the resonant-tank input
voltage and the two leakage-inductor
terminals in the transformer; then the operating frequency of the circuit
continuously tracks the resonant frequency as a reference frequency. Based
on the tracked reference frequency, the required voltage gain of the resonant
tank is regulated by offsetting the operating frequency. Consequently, the
operating frequency is lower than the resonant frequency to ensure the zero-voltage-switching
(ZVS) condition for less turn-on switching losses on the switches. This paper
presents the analysis of the proposed PLL control scheme. Finally, the current-equalizing
ability in the dimming range is demonstrated by experiments in order to validate
and demonstrate the performance and feasibility of the proposed circuit.
© 2006 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription