A new approach is proposed in this paper for the tracking of the optimal operating frequency in a Class E backlight inverter using the phase-locked loop (PLL) technique. First, a new single-stage backlight module is introduced to simplify the circuit and to raise the system efficiency. A piezoelectric transformer (PT) is used to drive the cold cathode fluorescent lamp (CCFL) to eliminate the downside of a conventional transformer and to reduce the dimension of the backlight module. Next, a PLL is embedded in the backlight system, as a feedback mechanism, to track the optimal operating frequency of the PT so that the PT's temperature effect is removed and, hence, the system efficiency and stability is improved. The feedback variable proposed is a phase angle rather than a lamp current amplitude traditionally used. A simplified model, along with its design procedure, is next presented. The complete analysis and design considerations are detailed. Finally, it is rather encouraging to observe that the experimental results match our analytical solutions closely.
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Chang Hua LIN, John Yanhao CHEN, "The Tracking of the Optimal Operating Frequency in a Class E Backlight Inverter Using the PLL Technique" in IEICE TRANSACTIONS on Electronics,
vol. E88-C, no. 6, pp. 1253-1262, June 2005, doi: 10.1093/ietele/e88-c.6.1253.
Abstract: A new approach is proposed in this paper for the tracking of the optimal operating frequency in a Class E backlight inverter using the phase-locked loop (PLL) technique. First, a new single-stage backlight module is introduced to simplify the circuit and to raise the system efficiency. A piezoelectric transformer (PT) is used to drive the cold cathode fluorescent lamp (CCFL) to eliminate the downside of a conventional transformer and to reduce the dimension of the backlight module. Next, a PLL is embedded in the backlight system, as a feedback mechanism, to track the optimal operating frequency of the PT so that the PT's temperature effect is removed and, hence, the system efficiency and stability is improved. The feedback variable proposed is a phase angle rather than a lamp current amplitude traditionally used. A simplified model, along with its design procedure, is next presented. The complete analysis and design considerations are detailed. Finally, it is rather encouraging to observe that the experimental results match our analytical solutions closely.
URL: https://global.ieice.org/en_transactions/electronics/10.1093/ietele/e88-c.6.1253/_p
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@ARTICLE{e88-c_6_1253,
author={Chang Hua LIN, John Yanhao CHEN, },
journal={IEICE TRANSACTIONS on Electronics},
title={The Tracking of the Optimal Operating Frequency in a Class E Backlight Inverter Using the PLL Technique},
year={2005},
volume={E88-C},
number={6},
pages={1253-1262},
abstract={A new approach is proposed in this paper for the tracking of the optimal operating frequency in a Class E backlight inverter using the phase-locked loop (PLL) technique. First, a new single-stage backlight module is introduced to simplify the circuit and to raise the system efficiency. A piezoelectric transformer (PT) is used to drive the cold cathode fluorescent lamp (CCFL) to eliminate the downside of a conventional transformer and to reduce the dimension of the backlight module. Next, a PLL is embedded in the backlight system, as a feedback mechanism, to track the optimal operating frequency of the PT so that the PT's temperature effect is removed and, hence, the system efficiency and stability is improved. The feedback variable proposed is a phase angle rather than a lamp current amplitude traditionally used. A simplified model, along with its design procedure, is next presented. The complete analysis and design considerations are detailed. Finally, it is rather encouraging to observe that the experimental results match our analytical solutions closely.},
keywords={},
doi={10.1093/ietele/e88-c.6.1253},
ISSN={},
month={June},}
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TY - JOUR
TI - The Tracking of the Optimal Operating Frequency in a Class E Backlight Inverter Using the PLL Technique
T2 - IEICE TRANSACTIONS on Electronics
SP - 1253
EP - 1262
AU - Chang Hua LIN
AU - John Yanhao CHEN
PY - 2005
DO - 10.1093/ietele/e88-c.6.1253
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E88-C
IS - 6
JA - IEICE TRANSACTIONS on Electronics
Y1 - June 2005
AB - A new approach is proposed in this paper for the tracking of the optimal operating frequency in a Class E backlight inverter using the phase-locked loop (PLL) technique. First, a new single-stage backlight module is introduced to simplify the circuit and to raise the system efficiency. A piezoelectric transformer (PT) is used to drive the cold cathode fluorescent lamp (CCFL) to eliminate the downside of a conventional transformer and to reduce the dimension of the backlight module. Next, a PLL is embedded in the backlight system, as a feedback mechanism, to track the optimal operating frequency of the PT so that the PT's temperature effect is removed and, hence, the system efficiency and stability is improved. The feedback variable proposed is a phase angle rather than a lamp current amplitude traditionally used. A simplified model, along with its design procedure, is next presented. The complete analysis and design considerations are detailed. Finally, it is rather encouraging to observe that the experimental results match our analytical solutions closely.
ER -