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Multi lamp tube driving system

A driving system and lamp technology, applied in the direction of lamp circuit layout, lighting devices, light sources, etc., can solve the problems of high cost, high cost of pulse modulation controller, complex structure of the driving system, etc., to reduce the utilization rate, reduce the cost, The effect of simple system structure

Inactive Publication Date: 2009-12-23
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of the pulse modulation controller is high, especially when driving multiple groups of lamps, the structure of the driving system is complex, and the use of multiple pulse modulation controllers leads to high cost of the entire lamp driving system

Method used

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  • Multi lamp tube driving system
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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0014] refer to figure 2 , shows the structure diagram of the first embodiment of the multi-lamp driving system of the present invention.

[0015] In the present invention, the multi-lamp driving system includes an AC / DC converter 11 , a driving circuit 12 , a lamp module 13 , a pulse width modulation controller 14 , and a bus controller (BUS Inverter Controller) 15 . Wherein, the light tube module 13 includes a plurality of light tubes.

[0016] The AC / DC converter 11 is used to receive AC voltage and convert it to DC voltage.

[0017] The drive circuit 12 is electrically connected to the AC / DC converter 11 for converting the received DC voltage into an AC voltage. The drive circuit 12 converts the received DC voltage into an AC voltage by utilizing the principle that a switch passes voltage when it is turned on, but does not pass the voltage when it is turned off. When the switch is turned on, the switch receives a DC voltage and outputs a high-potential signal, and when...

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Abstract

A multi-lamp driving system is used to drive a lamp module including multiple lamps. The multi-lamp driving system includes a converter for converting the input voltage into a DC voltage, a driving circuit for converting the DC voltage into an AC voltage, a pulse width modulation controller electrically connected between the lamp module and the converter, It is used to control the output voltage of the converter according to the signal fed back from the lamp module; a bus controller electrically connected between the lamp module and the drive circuit is used to adjust the operating frequency according to the signal fed back from the lamp module, and to control the voltage of the drive circuit. voltage output. The multi-lamp driving system provided by the present invention only uses one pulse width modulation controller, the system structure is simple, and the cost is effectively reduced.

Description

【Technical field】 [0001] The invention relates to a multi-load driving system, in particular to a multi-lamp driving system applied to a liquid crystal display (LCD) backlight module. 【Background technique】 [0002] Discharge lamps are commonly used as backlight sources for LCD panels, and have terminal voltage characteristics that vary according to the current state and the frequency of the AC signal applied to the lamp. The discharge lamp has a negative impedance characteristic, and its equivalent impedance will decrease as the input power increases. The circuit that supplies power / power to the lamp must have a controllable AC supply source, and a feedback circuit that can accurately detect the current in the lamp in order to maintain the stability of the circuit and have the function of load regulation. [0003] A system for driving multiple discharge lamps in the prior art usually uses two pulse width modulation controllers, one for regulating the magnitude of the curre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B41/36H05B41/14H05B37/02
Inventor 李启雄赵育孝范姜哲辰蔡正爵林宪男
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD