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Multiple lamp tube driving system

A driving system and lamp technology, applied in lighting devices, light sources, electrical components, etc., can solve the problems of increasing product cost and volume, increasing the number of parts used, etc.

Inactive Publication Date: 2003-03-12
HON HAI PRECISION IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although this method can achieve the effect of balancing the currents I1 and I2 between the two lamp tubes, it must increase the number of parts used, resulting in an increase in product cost and volume

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0017] refer to image 3 , which shows the multi-lamp driving system according to the first preferred embodiment of the present invention. The multi-lamp driving system according to the first preferred embodiment of the present invention includes a driving circuit 10 , a transformer T1 , a lamp group 60 , a current balance circuit 50 and a feedback control circuit 30 . The driving circuit 10 is connected to the primary of the transformer T1, and the two constitute a so-called inverter circuit, which can accept the input of a DC power supply Vin and convert the DC signal into an AC signal, and the AC signal is boosted by the transformer T1 and output from its secondary , to supply the power required by the lamp tube group 60 . The lamp set 60 is composed of a first lamp Lp1 and a second lamp Lp2. The current balance circuit 50 is electrically coupled to the high voltage end of the lamp set 60, and includes a first wound coil W1 electrically coupled to the first lamp Lp1, and ...

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PUM

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Abstract

The multiple lamp tubes drive system is utilized to drive the tube group including the first lamp tube and the second lamp tube. The sytem includes a drive circuit, a transformer and a current balance circuit. The drive circuit is used to convert the DC signal to the AC signal. The primary side of the transformer is coupled to the drive circuit, the the second side outputs the AC power. The current balanced circuit is coupled to the high voltage end and the low voltage end of the lamp tube group in order to balance the current values through the first lamp tube and the second lamp tube. The current balanced circuit includes the magnetic core, the first coil and the second coil. The first coil is coupled to the first lamp tube and the second coil is coupled to the second lamp tube. Both of the first and the second coils with on the same magnetic core and have the same number of turns.

Description

technical field [0001] The invention relates to a driving system of a discharge lamp, in particular to a multi-lamp driving system of a backlight system of a liquid crystal display. Background technique [0002] The LCD panel uses discharge lamps, especially cold cathode fluorescent lamps (CCFL), as the light source for the backlight system. Typically, a CCFL is driven by an inverter circuit that supplies AC power to the lamp, and usually has a feedback and control loop to monitor and maintain the stability of the lamp current. In larger LCD panels, two or more fluorescent tubes are required to provide sufficient lighting brightness. [0003] figure 1 A known multi-lamp drive system is shown. The system uses a driving circuit 10 and a transformer T1 to drive two fluorescent lamps Lp1 and Lp2, and only one set of feedback control circuits 30 is provided. Due to the difference in impedance among the lamp tubes, the currents I1 and I2 flowing throug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/14
Inventor 林为鸿陈佳园张邓康许正家
Owner HON HAI PRECISION IND CO LTD