An electronic ballast with piezoelectric transformer for cold cathode fluorescent lamps

Moo, C.S.; Chen, W.M.; Hsieh, Hung‐I

doi:10.1109/isie.2001.931751

Cited by 13 publications

(9 citation statements)

References 10 publications

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“…The PT resembles a high-selective bandpass filter [4]. Thus, when the switching frequency of the resonant inverter is near the mechanical resonant frequency of the PT, the DC component and the harmonics of the current i Ls are filtered out.…”

Section: Equivalent Circuit Model Of the Discussed Backlight Modulementioning

confidence: 99%

“…Thus, when the switching frequency of the resonant inverter is near the mechanical resonant frequency of the PT, the DC component and the harmonics of the current i Ls are filtered out. Sinusoidal voltage and current can then be produced to start up and drive the CCFL [4,8,9]. The root-mean-square (RMS) value of the fundamental component of terminal voltage of v s is [4] …”

Section: Equivalent Circuit Model Of the Discussed Backlight Modulementioning

confidence: 99%

“…In Figure 1, if the input current i Ls lags the input voltage v s , then the power switches can be operated at ZVS conditions to reduce the switching losses and EMI noises [4,18,19]. From Figure 2(d), the phase difference between v s and i Ls is Z .…”

Section: The Resonant Inductance L Smentioning

confidence: 99%

“…CHIU a piezoelectric transformer (PT) features the flat configuration, low power loss and immunity from the electro-magnetic interference (EMI). Thus, PTs are used to replace the electro-magnetic transformers in some rigid design cases, where spaces left for the CCFL inverters are limited [3][4][5].…”

mentioning

confidence: 99%

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Trans‐admittance control for eliminating the temperature effect of piezoelectric transformer in the CCFL backlight module

Pai

Chiu

2008

Circuit Theory & Apps

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SUMMARYA half-bridge (HB) resonant inverter for driving a cold cathode fluorescent lamp (CCFL) backlight module with a piezoelectric transformer (PT) is analyzed in this paper. The resonant inductance of the HB inverter is expressed as a function of the load current, the load resistance and the PT circuit parameters. Also, the trans-admittance of the PT-CCFL combination network is measured to track the operating frequency for the HB resonant inverter, which may be varied due to the temperature rise of PT. The lamp driving current and power can thus remain almost constant in a wide temperature range. Experiments show that the observed results match the theoretical analyses.

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Section: Equivalent Circuit Model Of the Discussed Backlight Modulementioning

confidence: 99%

Section: Equivalent Circuit Model Of the Discussed Backlight Modulementioning

confidence: 99%

Section: The Resonant Inductance L Smentioning

confidence: 99%

mentioning

confidence: 99%

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Trans‐admittance control for eliminating the temperature effect of piezoelectric transformer in the CCFL backlight module

Pai

Chiu

2008

Circuit Theory & Apps

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“…In particular, in the field of cold cathode fluorescent lamp (CCFL) inverters [1][2][3][4][5], they offer several advantages as compared to magnetic transformers, such as:…”

Section: Introductionmentioning

confidence: 99%

Analysis of large-signal and small-signal instabilities in piezoelectric transformers driving cold cathode fluorescent lamps

Spiazzi¹,

Buso²

Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2004. APEC '04.

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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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An electronic ballast with piezoelectric transformer for cold cathode fluorescent lamps

Cited by 13 publications

References 10 publications

Trans‐admittance control for eliminating the temperature effect of piezoelectric transformer in the CCFL backlight module

Trans‐admittance control for eliminating the temperature effect of piezoelectric transformer in the CCFL backlight module

Analysis of large-signal and small-signal instabilities in piezoelectric transformers driving cold cathode fluorescent lamps

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

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