A study on the T5 fluorescent lamp ballast used contour vibration mode piezoelectric transformer using a one-chip microcontroller

Hwang, Lark-Hoon; Yoo, Juhyun; Kim, J.R.; Jang, Eun-Sung; Lee, C.S.; Cho, M.T.; Kim, J.S.

doi:10.1109/isaf.2002.1195925

Cited by 4 publications

(2 citation statements)

References 4 publications

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“…Figure1 is the BLU structure used for TV. [3][4][5] CCFL, which serves as a light source for LCDs, is similar to general fluorescent lamps, but has the advantage of being small in size, high in brightness, and long service life. [6,7] CCFL and electrode rod structures are manufactured by welding Durmet to Kovar pins as shown in figure 2 and laser welding or resistance welding to Ni cups where glass is beaded.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Manufacturing of Molybdenum Pins for Electrodes

Lee¹

2021

TURCOMAT

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The molybdenum cup and molybdenum pin, which are the main materials of the molybdenum electrode used for the LCD BLU CCFL electrode, have not been developed in Korea and imported from Japan. In this paper, especially, research on prototype manufacturing and CAE analysis is performed to develop a molybdenum pin. In this research, to develop the manufacturing technology of molybdenum pin used for CCFL electrode of LCD BLU, development of linear processing technology, development of molybdenum wire surface treatment technology, development of wire cutting technology, production of molybdenum pin, design and fabrication of JIG and Fixture for inspection, molybdenum pin prototyping and analysis, and development of 100% molybdenum pin inspection technology. The development of molybdenum pins developed through this research can overcome Japan's technological level, which depends entirely on imports from Japan, and it is thought that the development will have a significant impact on the overall industry using molybdenum pins.

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Section: Introductionmentioning

confidence: 99%

A Study on the Manufacturing of Molybdenum Pins for Electrodes

Lee¹

2021

TURCOMAT

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“…Piezoelectric transformers (PT) have several advantages over electromagnetic transformers, such as no magnetic noise, small size, high power density and high efficiency. Piezoelectric transformers are currently found in many applications, such as switching converters [1,2], battery chargers for mobile phones [3], and neon lamp power supplies [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Power capability enhancement of a piezoelectric transformer

Guyomar

Magnet

Lefeuvre

et al. 2006

Smart Mater. Struct.

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The size reduction of power supplies motivates the research of new elements which could be better candidates for integration. In this field, electromagnetic transformers may be replaced, with significant advantage, by piezoelectric transformers (PT).In a PT, the input electrical energy is transferred to the output through a mechanical wave using the direct and converse effects of piezoelectric materials. The main advantages of PTs over electromagnetic transformers are: no magnetic noise generation, smaller size, higher power density and higher efficiency.This paper presents an innovative non-linear processing technique derived from the so-called 'synchronized switch damping' technique (SSD), that was developed to address the structural damping problem. In transformer applications, the power capability of piezoelectric materials is mainly limited by mechanical losses related, in particular, to the mechanical wave amplitude.This synchronized switch technique provides a strong attenuation of the PT mechanical wave amplitude while preserving the transmitted power level. Thus, the PT efficiency and its power capability are significantly enhanced. Theoretical predictions and experimental results using a PT structure similar to a Langevin transducer show that the power capability may increase over 450%.

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