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Tube flow equalizing application circuit

A lamp and circuit technology, which is applied in the field of lamp current equalization application circuit, can solve the problems of different inductance and the inability to use an odd number of lamps, etc.

Inactive Publication Date: 2007-03-14
LIEN CHANG ELECTRONICS ENTERPRISE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The known circuit for adjusting the lamp current in the above description has a common disadvantage, that is, when the circuit is applied to multiple lamps, it can only be applied to the balance between two lamps, and cannot be applied to an odd number of lamps. , and taking Figure 6 as an example, the inductances of the coils at all levels are different and can only be applied to the number of lamp tubes to the power of two

Method used

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  • Tube flow equalizing application circuit
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Embodiment Construction

[0056] Please refer to FIG. 7 , which is a schematic diagram of a current sharing application circuit for two lamps according to the first embodiment of the present invention. The circuit shown in Figure 7 takes two lamps as an example, which includes a first transformer T1 with a first primary winding L1p and a first secondary winding L1s; and a transformer T1 with a second primary winding L2p and a second secondary The second transformer T2 of the winding L2s, one end of the second main winding L2p is connected to a power supply Vsec, the other end is connected to a first lamp L1 through the first secondary winding L1s, and one end of the second secondary winding L2s is connected to a The other end of the second lamp L2 is connected to the power supply Vsec through the first main winding L1P; thereby, the power supply Vsec provides the same working current i1, i2 to the lamps L1, L2.

[0057] The secondary winding of the first transformer T1 is connected in series with the m...

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Abstract

This invention relates to lamp even current circuit, which is characterized by the following: using the transducer with main roller and assistant roller set to connect the assistant set with one lamp and other end to one power through adjacent transducer main set through roller set; the power can make lamp achieve even balance through transducer to improve the public circuit to generate different inductance; the odd lamp tubes can be applied into even lamp common shortcomings.

Description

technical field [0001] The invention relates to an application circuit for current sharing of lamp tubes, in particular to a circuit for adjusting the current balance among multiple lamp tubes by utilizing the connection relationship between multiple transformers and multiple lamp tubes. Background technique [0002] Due to technological progress and consumer demand, the size of LCD panels continues to increase, so that a single light tube can no longer meet its lighting requirements, so two or more light tubes need to be used. In order to ensure uniform brightness of the LCD panel, the current of each lamp tube must be adjusted at any time so that the current flowing through each lamp tube is equal. However, due to various reasons such as high instability and negative impedance characteristics of cold cathode fluorescent lamps (CCFL), it is difficult to maintain consistent lamp impedance, resulting in changes in the impedance of each lamp tube and making the current unable ...

Claims

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Application Information

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IPC IPC(8): H05B41/14H02J3/00
Inventor 陈振刚王政雄
Owner LIEN CHANG ELECTRONICS ENTERPRISE
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