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LED parallel circuit with equalized branch current

A branch current, LED lamp technology, applied in the direction of electric lamp circuit layout, electric light source, lighting device, etc., can solve the problems of poor uniformity of screen brightness, large difference in the characteristics of light strings, unbalanced current between light strings, etc. The effect of current inconsistency

Inactive Publication Date: 2013-05-22
SICHUAN CHANGHONG PHOTOELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after the LED light strings of the traditional circuit are connected in parallel, if the characteristics of the parallel LED light strings are quite different, the current imbalance between the light strings is prone to occur. Taking LED LCD TVs as an example, the uneven current will cause the brightness uniformity of the screen. Poor, seriously affecting normal viewing

Method used

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  • LED parallel circuit with equalized branch current

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Embodiment

[0013] Such as figure 1 As shown, this example includes a constant current source, a parallel LED light string unit and a resistor current equalizing circuit unit. The parallel LED light string unit 11 includes at least two LED light strings, and each LED light string is composed of a single or multiple LED light strings in series. In this embodiment, 3 LED light strings are connected in parallel, each LED light string consists Two LED lights connected in series are used as an example to illustrate. The current sharing circuit unit 12 is composed of current sharing resistors, the number of which is equal to the number of LED light strings, and correspondingly connected in series with the LED light strings. The current sharing resistor can be connected in series with the positive pole or the negative pole of the LED. In this embodiment, the current sharing resistor is connected in series with the negative pole for illustration. The constant current source 10 provides a consta...

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Abstract

The invention relates to electronic circuit technology, in particular to an LED parallel circuit with equalized branch current. The LED parallel circuit comprises a constant current source and LED units, and is characterized by further comprising a current equalizing unit. The constant current source is connected with the LED units and the current equalizing unit respectively, and the LED units are connected with the current equalizing unit. The LED parallel circuit has the advantages that current flowing through different LED light strings which are in parallel connection is equalized, and inconsistency of current due to individual difference of the LEDs is eliminated, and beneficial conditions are provided for constant-current drive of the LED light strings. In addition, the technical scheme is particularly applicable to the LED parallel circuit driven by the constant-current source.

Description

technical field [0001] The invention relates to electronic circuit technology, in particular to an LED parallel circuit with balanced branch current. Background technique [0002] With the popularity of semiconductor light-emitting diodes (LEDs), LEDs have been widely used in many fields such as LED LCD TVs and LED lighting lamps. In the actual application process, a certain number of LED lights are generally connected in series and parallel as the light source. In order to control costs, when a large number of LED lights are connected in series and parallel, multiple or multiple LED lights are often used. implemented in parallel. However, after the LED light strings of the traditional circuit are connected in parallel, if the characteristics of the parallel LED light strings are quite different, the current imbalance between the light strings is prone to occur. Taking LED LCD TVs as an example, the uneven current will cause the brightness uniformity of the screen. Poor, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 秦博
Owner SICHUAN CHANGHONG PHOTOELECTRIC
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