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Piezoelectric transformer drive circuit

A piezoelectric transformer and drive circuit technology, applied in the direction of instruments, electric light sources, electrical components, etc., can solve the problems of increased difficulty in miniaturization, current imbalance, and large differences in piezoelectric transformers, so as to improve current balance, current Better balance, less flickering effect

Inactive Publication Date: 2012-10-31
佛山市南海平板显示技术中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] figure 1 It shows a piezoelectric transformer driving circuit in the prior art, in which the piezoelectric transformers are connected in parallel, and each output end lights up the corresponding cold cathode tube respectively. Due to the large difference of the piezoelectric transformers, it is easy to produce a current unbalanced situation
In LCD TVs, when multiple CCFLs are used as the backlight of the LCD panel and a piezoelectric transformer is connected to each CCFL, unless the currents flowing through the picture tubes of each CCFL are equalized, it will lead to uneven backlight lumens. Uniformity, usually in the prior art, a special control circuit is used to connect each piezoelectric transformer to control the output current of each piezoelectric transformer, which will additionally increase the cost of the circuit and cause power loss of other circuits so that Efficiency drops and manufacturing costs increase and miniaturization becomes more difficult

Method used

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Examples

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Embodiment 1

[0024] figure 2 A logical block diagram showing a piezoelectric transformer drive circuit according to the first embodiment of the present invention; as figure 2 As shown, the driving circuit includes an input voltage module, a power stage module, a piezoelectric transformer group, a fluorescent lamp group, a PWM control chip and a switch circuit. Wherein, the input voltage module is connected with the power stage module, and is used for supplying the input DC voltage to the power stage module. Wherein, the power stage module is a full bridge structure circuit. Wherein, the power stage module is connected with the piezoelectric transformer group, and two adjacent piezoelectric transformers are used to drive a fluorescent lamp. Wherein, the terminals on the primary side of the piezoelectric transformer group are connected in series, and the bottom terminal is connected to a PWM control chip, and the PWM control chip adjusts the current input of the full bridge structure acc...

Embodiment 2

[0028] image 3 shows a piezoelectric transformer drive circuit according to a second embodiment of the present invention, image 3 lieutenant general and figure 2 Similar parts are omitted, while referring to figure 2 and image 3 , The piezoelectric transformer driving circuit of the second embodiment includes the driving circuit including an input voltage module, a power stage module, a piezoelectric transformer group, a fluorescent lamp group, a PWM control chip, a resonant circuit and a switch circuit. Wherein, the input voltage module is connected with the power stage module, and is used for supplying the input DC voltage to the power stage module. Wherein, the power stage module is a full bridge structure circuit. Wherein, the power stage module is connected with the resonant circuit, the full bridge circuit is switched to generate a square wave signal, the square wave signal is converted into a sine wave signal by the resonant circuit, and the sine wave signal is...

Embodiment 3

[0034] Figure 5 A logical block diagram showing a piezoelectric transformer driving circuit according to a third embodiment of the present invention; as Figure 5 As shown, the driving circuit includes an input voltage module, a power stage module, a resonant circuit, a piezoelectric transformer group, a fluorescent lamp group, a PWM control chip and a switch circuit.

[0035] Wherein, the input voltage module is connected with the power stage module, and is used for supplying the input DC voltage to the power stage module. Wherein, the power stage module is a full bridge structure circuit. Wherein, the power stage module is connected with the resonant circuit, the full bridge circuit is switched to generate a square wave signal, the square wave signal is converted into a sine wave signal by the resonant circuit, and the sine wave signal is provided to the piezoelectric transformer. Two adjacent piezoelectric transformers are used to drive a fluorescent lamp. Wherein, the ...

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PUM

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Abstract

The invention provides a piezoelectric transformer drive circuit used for cold cathode tubes. The piezoelectric transformer drive circuit comprises an input voltage module, a power level module, a piezoelectric transformer bank and a fluorescent lamp bank. The piezoelectric transformer drive circuit is characterized in that the input voltage module is connected with the power level module and is used for supplying the input direct current voltage to the power level module; the power level module is connected with the piezoelectric transformer bank; two adjacent piezoelectric transformers are used for driving one fluorescent lamp; and terminals at the primary side of the piezoelectric transformer bank are connected in series.

Description

technical field [0001] The invention relates to a driving device for a cold cathode fluorescent lamp, and more specifically, the invention relates to a piezoelectric transformer driving circuit for a cold cathode tube of a liquid crystal television. Background technique [0002] In recent years, in display devices equipped with liquid crystal displays, cold-cathode tubes are generally used as the backlight light source, and piezoelectric transformers are usually used as step-up transformers for driving the cold-cathode tubes of the backlight. A piezoelectric transformer is a voltage conversion element that inputs an alternating voltage to the primary side of a piezoelectric element to generate mechanical vibrations using the piezoelectric effect, and outputs a voltage from the secondary side that is amplified at a step-up ratio determined by the shape of the piezoelectric transformer. voltage drive. [0003] In the driving circuit of the cold cathode tube power generation d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34G09G3/36H05B41/36
CPCY02B20/202Y02B20/00
Inventor 许志仰田滢湄
Owner 佛山市南海平板显示技术中心
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