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Interleaving LED drive circuit based on quadratic form Buck and working method thereof

A LED drive and secondary type technology, which is applied in the field of interleaved parallel circuit and LED drive power supply, can solve the problems of low power density of the converter, large filter inductor volume, large output current ripple, etc., and achieve small voltage and current stress, The effect of increasing the voltage transfer ratio and reducing the output current ripple

Inactive Publication Date: 2016-05-04
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of large output current ripple, large filter inductor volume, and low power density of the converter in the traditional quadratic Buck converter, the present invention optimizes the original quadratic Buck converter and proposes a Interleaved Parallel LED Driving Circuit and Its Working Method of Secondary BUCK

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  • Interleaving LED drive circuit based on quadratic form Buck and working method thereof
  • Interleaving LED drive circuit based on quadratic form Buck and working method thereof
  • Interleaving LED drive circuit based on quadratic form Buck and working method thereof

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Embodiment Construction

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0027] Such as figure 1 As shown, an interleaved parallel LED drive circuit based on secondary Buck, including AC input, rectifier bridge D 1 , filter inductance L f , filter capacitor C f , two switches Q 1 , Q 2 , Diode D 2 、D 3 、D 4 、D 5 、D 6 , inductance L 1 , L 2 , L 3 and storage capacitor C 1 、C 2 , the output capacitance C 0 and LED loads.

[0028] Diode D 2 、D 3 、D 4 、D 5 , switch Q 1 , capacitance C 1 , inductance L 1 , L 2 Constitute a secondary Buck conversion circuit topology; switch tube Q 2 , inductance L 3 , capacitance C 2 and diode D 6 A switch network is formed, and the switch network and the secondary Buck conversion circuit form an interleaved parallel structure.

[0029] The AC input passes through the rectifier bridge D 1 rec...

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Abstract

The invention discloses an interleaving LED drive circuit based on quadratic form Buck and a working method thereof, belonging to the field of power electronics. The interleaving LED drive circuit based on quadratic form Buck comprises an alternating current input, a rectifier bridge D1, a filter inductor Lf, a filter capacitor Cf, two switch tubes Q1 and Q2, diodes D2, D3, D4, D5 and D6, inductors L1, L2 and L3, energy-storage capacitors C1 and C2, an output capacitor Co and an LED load. Based on the existing quadratic form Buck converter circuit topology, a switch network composed of the switch tube Q2, the inductor L3, the capacitor C2 and the diode D6 is added, and an interleaving type structure is formed, thus, output current ripple is reduced effectively, filter inductor design is reduced, volume of the converter is decreased, system stability and power density are improved, and running with high efficiency and high power factor is realized.

Description

technical field [0001] The invention belongs to the technical field of power electronics application, and in particular relates to an interleaved parallel circuit based on a secondary Buck converter and a working method thereof, which is suitable for a switching power supply, especially an LED driving power supply. Background technique [0002] In order to suppress the low-frequency harmonic pollution of the grid-side input current, the International Electrotechnical Commission requires lighting appliances above 25W to meet the low-frequency harmonic electromagnetic compatibility standards promulgated by authoritative organizations such as IEC1000-3-2. In order to meet the above requirements, LED drive power supply must add power factor correction function. [0003] Generally, LED driving power can be divided into two types: single-stage and two-stage circuits in terms of circuit structure. For a single-stage LED drive circuit, a DC / DC conversion circuit has both the PFC fu...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37
Inventor 廖志凌刘康顾赟
Owner JIANGSU UNIV