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Method for controlling drive circuit of cold-cathode fluorescence lamp and control circuit

A technology of a cold cathode fluorescent lamp and a control method, which is applied in the directions of light sources, electric light sources, electrical components, etc., can solve the problems of increasing the complexity of circuit design, increasing production costs, and complex control circuits.

Inactive Publication Date: 2011-04-20
CHENGDU MONOLITHIC POWER SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the control circuit of the discharge lamp driving circuit in the prior art is relatively complicated, and many circuit components are required for implementation at the integrated circuit level, and two different pins need to be set aside for realizing the control circuit when the chip is packaged. The stability compensation of the control loop and the setting of the final value of the frequency sweep (that is, the ignition frequency) and the frequency sweep speed not only increase the complexity of the circuit design but also increase the production cost

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  • Method for controlling drive circuit of cold-cathode fluorescence lamp and control circuit
  • Method for controlling drive circuit of cold-cathode fluorescence lamp and control circuit
  • Method for controlling drive circuit of cold-cathode fluorescence lamp and control circuit

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Embodiment Construction

[0063] The CCFL driving circuit control method and control circuit of the embodiments of the present invention will be described in detail below. In the following description, some specific details, such as specific circuit structures in the embodiments and specific parameters of these circuit elements, are used to provide a better understanding of the embodiments of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without many of the details or other combinations of methods, elements, materials, etc.

[0064] figure 2 It is a schematic diagram of the CCFL drive circuit control circuit according to one embodiment of the present invention. The control circuit 200 is mainly composed of a feedback network 202 , a fault detector 204 , a control signal generator 206 , a duty cycle control module 208 , a frequency sweep enabling module 210 , a frequency control module 212 and a driving module 214 . The input term...

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Abstract

The invention discloses a method for controlling a drive circuit of a cold-cathode fluorescence lamp (CCFL), comprising the following steps: sampling a current or voltage signal of the CCFL to generate a feedback signal; detecting the state of the lamp to generate a state signal; processing the state signal and the feedback signal to generate a control signal; comparing the control signal with a frequency sweeping threshold signal to generate a comparison signal; and based on the comparison signal, using the control signal to selectively adjust the duty cycle of a switching control signal output by the drive circuit or control the frequency of the switching control signal output by the drive circuit to be swept highly. The invention also discloses a control circuit for realizing the method. The invention realizes adjusting the duty cycle of the switch of the drive circuit of the CCFL and controlling the frequency of the switch to be swept highly only via a control signal, thus simplifying circuit design and lowering the cost.

Description

technical field [0001] The invention relates to a control method and a control circuit of a drive circuit of a discharge lamp, in particular to a control method and a control circuit of a cold cathode fluorescent lamp (CCFL) inverter. Background technique [0002] Display backlight discharge lamps used in various electronic devices, such as cold cathode fluorescent lamps, generally require an inverter circuit to drive them to work. The inverter circuit is used to convert the relatively low DC voltage into a high-voltage and high-frequency AC voltage suitable for the normal operation of the discharge lamp and generate a start-up voltage about three times higher than the normal operating voltage of the lamp when the lamp is ignited. glow voltage. Therefore, in order to ensure the normal and stable operation and safe ignition of the discharge lamp, it is usually necessary to design an inverter control circuit to adjust the inverter output to drive the proper AC voltage require...

Claims

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Application Information

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IPC IPC(8): H05B41/295H05B41/298H05B41/36
CPCH05B41/2858H05B41/2855
Inventor 邝乃兴杜磊任远程
Owner CHENGDU MONOLITHIC POWER SYST
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