Control method of resonant LED current-sharing circuit

A LED circuit and circuit control technology, which is applied in the direction of electric light source, electrical components, electroluminescent light source, etc., can solve the problem of low accuracy of LED current, and achieve the effect of high accuracy

Inactive Publication Date: 2017-03-22
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These two methods both implement open-circuit protection through hardware circuits, which can avoid excessive LED current when open-circuit occurs, but the accuracy of these methods for controlling and adjusting the LED current is relatively low

Method used

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  • Control method of resonant LED current-sharing circuit
  • Control method of resonant LED current-sharing circuit
  • Control method of resonant LED current-sharing circuit

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Embodiment Construction

[0033] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0034] Please refer to figure 1 , an embodiment of the present invention provides a method for controlling a resonant LED current sharing circuit. The resonant LED current sharing circuit at least includes a sequentially connected drive circuit, a resonant conversion network, and an LED circuit. The LED circuit includes multiple channel...

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Abstract

The invention discloses a control method of a resonant LED current-sharing circuit. The resonant LED current-sharing circuit at least comprises a drive circuit, a resonant transformation network and an LED circuit which are sequentially connected. The control method comprises the steps as follows: a drive signal is input into the resonant transformation network, various paths of LED strings begin to work, and flowing current of various paths of LED strings and voltage of two ends are sampled; when the condition that the flowing current of each path of LED string reaches a rated value is detected, whether the voltage of two ends of various paths of LED strings exceeds a preset range or not is detected; and if the condition that the voltage of two ends of at least one path of LED string exceeds the preset range is detected, the drive signal is adjusted and the flowing current of the other paths of LED strings is maintained at the rated value. According to the control method of the resonant LED current-sharing circuit, when the condition that an open-circuit fault appears in an LED circuit is detected, the flowing current of the other paths of LED strings is maintained at the rated value through adjusting the drive signal, and the control accuracy on the current in the circuit is high.

Description

technical field [0001] The invention relates to the technical field of LED circuit control, in particular to a method for controlling a resonant LED current sharing circuit. Background technique [0002] LED is called the fourth-generation lighting source or green light source. It has obvious advantages such as energy saving and environmental protection, small size, less maintenance and long service life, and is more and more favored by people. [0003] At present, the LED current sharing circuit based on the resonant converter is widely used, and the resonant converter has the advantages of small switching loss, high efficiency, and small stress of switching elements. In the LED current sharing circuit, there are multiple LED branches connected in parallel. When an LED is open, the output impedance of the circuit will change, which will increase the current of the other normal LED branches. The LED is a current-sensitive device that is sensitive to current. The rise of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00H05B45/50Y02B20/30
Inventor 唐雄民栾帅杰王乐
Owner GUANGDONG UNIV OF TECH
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