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Multipath current-sharing output LED (Light-Emitting Diode) driving power supply and dimming method

A technology of LED drive and power supply, applied in the direction of electric light source, electroluminescent light source, light source, etc., can solve the problems of multiple devices, complex control circuit, high cost, etc., and achieve simple circuit structure, high dimming precision and wide dimming range Effect

Inactive Publication Date: 2016-03-09
FUZHOU UNIVERSITY
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  • 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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  • Multipath current-sharing output LED (Light-Emitting Diode) driving power supply and dimming method
  • Multipath current-sharing output LED (Light-Emitting Diode) driving power supply and dimming method
  • Multipath current-sharing output LED (Light-Emitting Diode) driving power supply and dimming method

Examples

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Embodiment Construction

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

[0033] like figure 1 As shown, this embodiment provides a multi-channel current sharing output LED driving power supply, including a switch network module, an LCL-nT resonant network, a rectifier network and an LED load unit connected in sequence; 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-shift bridge arm to realize wide-range dimming control, and the load unit includes n-channel current-sharing output LED loads.

[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 capacitor C r , and n inductors L k1 to L kn ; The DC blocking capacitor C s1 One end of the DC blocking capacitor Cs2 One e...

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Abstract

The invention relates to a multipath current-sharing output LED (Light-Emitting Diode) driving power supply and a dimming method. The driving power supply comprises a switching network module, an LCL-nT type resonance network, a rectification network and a load unit, which are orderly connected with each other; the switching network comprises a first bridge arm and a second bridge arm which are connected in parallel, wherein the second bridge arm is used as a phase shift bridge arm and used for realizing wide-range lighting control; and the load unit comprises n paths of current-sharing output LED loads. The multipath current-sharing output LED driving power supply and the dimming method provided by the invention can realize constant and balanced output current under multiple paths of different LED lamp voltages, and have the characteristics of being simple in circuit structure, good in constant-current characteristic and high in current sharing accuracy, etc.

Description

technical field [0001] The invention relates to the field of LED driving power, in particular to a multi-channel current sharing output LED driving power supply and a dimming method. Background technique [0002] As the fourth-generation electric light source, LED has gradually been 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 field of lighting. The efficient and reliable LED driver is the key to ensure the stable operation of the LED. Because LED lamps have nonlinear volt-ampere characteristics and negative temperature characteristic coefficient characteristics, LEDs are usually driven by constant current to ensure constant luminous brightness. [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 requirements of illuminance. This requires a series-parallel met...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00H05B45/10Y02B20/30
Inventor 林国庆林威伟
Owner FUZHOU UNIVERSITY
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