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Novel multi-path LED passive current-equalizing circuit and LED driving power source

A LED light string and current sharing technology, which is applied in the direction of electric lamp circuit layout, light source, electric light source, etc., can solve the problems of poor current sharing accuracy, large circuit volume and loss, etc., and achieve good current sharing effect and simple circuit effect

Inactive Publication Date: 2013-05-22
FUZHOU UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] For the existing passive current sharing strategy, the current sharing accuracy is poor in the case of more than four outputs, or the circuit size and loss are large due to the use of coupled inductors. , the present invention proposes a new type of passive current sharing strategy, applying the method of capacitive current sharing to the occasion of multiple outputs

Method used

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  • Novel multi-path LED passive current-equalizing circuit and LED driving power source
  • Novel multi-path LED passive current-equalizing circuit and LED driving power source
  • Novel multi-path LED passive current-equalizing circuit and LED driving power source

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] Such as figure 1 As shown, this embodiment provides a new type of multi-channel LED passive current sharing circuit, including an LLC converter, which is characterized in that: the LLC converter has first and second secondary side windings and first and second sets of output equalization stream circuit;

[0021] The first set of output current sharing circuits includes a first current sharing capacitor, the first end of the first current sharing capacitor is connected to the first output end of the first secondary winding, and the second end is connected to the first diode The anode of the first diode is connected to the cathode of the third diode, and the cathode of the first diode is connected to the anode of the first LED light string; the second output terminal of the first secondary winding is connected to the second output of the second di...

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Abstract

The invention relates to a novel multi-path LED passive current-equalizing circuit. The novel multi-path LED passive current-equalizing circuit comprises an LLC (logical link control) converter, and is characterized in that the LLC converter provided with a first secondary winding, a second secondary winding, a first group of output current-equalizing circuits and a second group of output current-equalizing circuits is capable of realizing output of equalized current of four paths of LED strings; and a provided four-path passive equalized current outputting strategy based on the LLC converter can be developed to 2N random paths of equalized current output for different output voltage. The novel multi-path LED passive current-equalizing circuit has the advantages of simplicity, good current equalizing effect and the like. The invention further provides an LED driving power source utilizing the novel multi-path LED passive current-equalizing circuit.

Description

technical field [0001] The invention relates to the technical field of LED current sharing, in particular to a novel multi-channel LED passive current sharing circuit and an LED driving power supply using the current sharing circuit. Background technique [0002] In recent years, the current situation of energy shortage has made human beings increasingly aware of the importance of energy conservation and emission reduction. As a new type of lighting source, LED has the advantages of long life, energy saving and environmental protection, so it will definitely occupy a place in the future lighting field, and efficient and reliable LED driving power is the key to the rapid development of LED lighting. [0003] In practical applications, high-power LEDs often require the use of multiple LEDs in parallel. However, the different V-I characteristics of LEDs in different branches will lead to uneven currents. Therefore, it is necessary to study the current sharing strategy for multi...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 林国庆吴思远
Owner FUZHOU UNIV
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