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A LED drive power supply with multi-channel current sharing output and dimming method

A technology of LED driving and power supply, applied in electric light source, electroluminescent light source, light source, etc., can solve the problems of high cost, complicated control circuit, multiple components, etc., and achieve wide dimming range, high dimming precision, and circuit structure. simple effect

Inactive Publication Date: 2017-05-10
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Active current sharing scheme, each branch has a relatively independent constant current control circuit, so the current sharing effect is good, but it needs to use more components, the cost is high, and the control circuit is relatively complicated

Method used

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  • A LED drive power supply with multi-channel current sharing output and dimming method
  • A LED drive power supply with multi-channel current sharing output and dimming method
  • A LED drive power supply with multi-channel current sharing output and dimming method

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] like figure 1 As shown, this embodiment provides a LED drive power supply with multi-channel current sharing output, including a switch network module connected in sequence, an LCL-nT resonant network, a rectifier network, and an LED load unit; wherein the switch network includes a two-phase The first bridge arm and the second bridge arm are connected in parallel, wherein the second bridge arm is used as a phase-shifted bridge arm to realize wide-range dimming control, and the load unit includes n LED loads with current sharing output.

[0034] In this embodiment, the LCL-nT resonant network includes a DC blocking capacitor C s1 , DC blocking capacitor C s2 , Resonant inductance L r1 , Resonant inductance L r2 , Resonant capacitance C r , and n inductors L k1 to L kn ; The blocking capacitor C s1 One end of the DC blocking capacitor Cs2 O...

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Abstract

The present invention relates to a LED drive power supply and a dimming method with multi-channel current equalization output, the drive power supply includes a switch network module connected in sequence, an LCL-nT resonant network, a rectifier network and a load unit; wherein the switch network includes two The first bridge arm and the second bridge arm are connected in parallel, wherein the second bridge arm is used as a phase-shifted bridge arm to realize wide-range dimming control, and the load unit includes n LED loads with current sharing output. The invention can realize the constant and balanced output current of each channel under multiple different LED lamp voltages, and has the characteristics of simple circuit structure, good constant current characteristic, high current equalization precision, and the like.

Description

technical field [0001] The invention relates to the field of LED driving power supply, in particular to a LED driving power supply with multi-channel current equalizing output and a dimming method. Background technique [0002] As the fourth-generation electric light source, LED is gradually favored by people due to its advantages of long service life, high luminous efficiency, energy saving, and environmental protection, and has become the focus of attention in the lighting field. An efficient and reliable LED driver is the key to ensure the stable operation of the LED. Since LED lamps have nonlinear volt-ampere characteristics and negative temperature characteristic coefficient characteristics, LEDs are usually driven by constant current to ensure constant luminance. [0003] Due to the small power of a single LED, it is usually necessary to light up multiple LEDs at the same time in order to meet the illumination requirements. This requires a series-parallel method to c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00H05B45/10Y02B20/30
Inventor 林国庆林威伟
Owner FUZHOU UNIV
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