Cold cathode fluorescent lamp power supply based on piezoelectric transformers

Spiazzi, G.; Buso, Simone; Tomasin, P.

doi:10.1109/pesc.2004.1355780

Cited by 11 publications

(8 citation statements)

References 7 publications

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“…To achieve ZVS condition, the time we charge or discharge total capacitor at PT's input to VDD or ground with the input current of PT must less than the dead time TD: Ctotal X VDD (2) I T The largest PT's input current in the dead time TD occurs at the beginning of the period which value is:…”

Section: Design Strategymentioning

confidence: 99%

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ZVS Considerations for a Phase-Lock Control DC/DC Converter with Piezoelectric Transformer

Chen

2006

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

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Piezoelectric transformer (PT) is attractive to the low power converting applications with advantages of high efficiency, small size, low EMI and high power density,. This paper discusses ZVS conditions for a phase-lock control PT DC/DC converter, and we regulate the output voltage with the second loop. A 15V to 45V DC/DC converter is implemented with discrete circuit. Finally we show the experimental results.

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Section: Design Strategymentioning

confidence: 99%

“…Piezoelectric transformer (PT) is suitable for drive cold cathode fluorescent lamp (CCFL) because that the gain of PT matches the impedance of CCFL [1] [2]. PT is also good for DC/DC applications because of the superior characteristic of PT mentioned above.…”

Section: Introductionmentioning

confidence: 99%

ZVS Considerations for a Phase-Lock Control DC/DC Converter with Piezoelectric Transformer

Chen

2006

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

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“…To ignite the lamp, we use a piezoelectric transformer (PT), instead of an electromagnetic type step-up transformer, in a CCFL driving circuit for the advantages of miniature volume, high efficiency, fine insulation, no EMI, etc. [4][5][6][7]. To reduce the number of circuit components, we adopt an integrated circuit (IC) as the controller for the said driving circuits.…”

Section: Introductionmentioning

confidence: 99%

Design and implementation of a digital control IC for driving multiple cold cathode fluorescent lamps

Shin¹,

Yang²

2008

Circuit Theory & Apps

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This study designs and develops a digital control integrated circuit (IC) for driving circuits operating multiple cold cathode fluorescent lamps (CCFLs). The control IC adopts an external crystal oscillator for the IC's external frequency to provide the driving circuits a fixed frequency. Inside the IC, two control loops are designed, under synchronized operation frequencies, for a boost regulator and an inverter. The main function of the boost regulator control loop is to supply a steady DC voltage for the inverter. In designing the inverter's control circuit, an adjustable-frequency adjustable-voltage soft-start technique is used to start the lamps. We also use burst mode digital dimming technique to achieve synchronized dimming for the parallel-connected lamp-ignition circuits. The feedback voltage from the CCFLs can determine if any lamp is abnormal via a proposed lamp abnormality detection circuit. To deal with the equivalent-circuit's component parameter differences among various manufacturers' and brands' piezoelectric transformers (PTs), the inverter's operation frequency is designed fine-tunable in this study. Finally, the proposed design concept was implemented with an actual control IC and a driving circuit for CCFLs. The measured data and waveforms from our test circuitry are presented, which verifies the validity of the miniaturized controller proposed in this study.

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“…Recently, piezoelectric transformers (PTs) have been used in different power electronics applications, as dc-dc converters, lamp ballasts and igniters [12]- [17]. Particularly, Rosen type PTs are well suited for high voltage applications [18]- [21].…”

Section: Introductionmentioning

confidence: 99%

High Voltage Power Supply for Ozone Generation Based on Piezoelectric Transformer

Alonso

Ordiz

Costa

et al. 2007

2007 IEEE Industry Applications Annual Meeting

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Even though nowadays piezoelectric transformers (PT) are only available with low power rating, there exist several low power applications of ozone generation in which the use of this novel technology could be advantageous. Hence, the aim of this paper is to evaluate the possibilities of using PTs in the implementation of high voltage power supplies for ozone generation. First, the possible topologies that can be used to drive the PT are identified. Then, the half bridge inverter operating under zero voltage switching (ZVS) is investigated, and the effect of the silent discharge generator (SDG) on the converter operation is analyzed. A new control circuit that allows the ZVS operation is proposed. The control circuit operates in closed loop by measuring the phase between the PT's resonant current and the switching pattern and adjusting the switching frequency to the optimum value to assure ZVS. A laboratory prototype for a 6 W SDG was tested, and obtained experimental results are shown.

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Cold cathode fluorescent lamp power supply based on piezoelectric transformers

Cited by 11 publications

References 7 publications

ZVS Considerations for a Phase-Lock Control DC/DC Converter with Piezoelectric Transformer

ZVS Considerations for a Phase-Lock Control DC/DC Converter with Piezoelectric Transformer

Design and implementation of a digital control IC for driving multiple cold cathode fluorescent lamps

High Voltage Power Supply for Ozone Generation Based on Piezoelectric Transformer

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