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A kind of staggered parallel led driving circuit based on quadratic buck and its working method

An LED drive, secondary technology, applied in the field of interleaved parallel circuit and LED drive power supply, can solve the problems of large output current ripple, low power density of the converter, and large filter inductance, so as to reduce the output current ripple. wave, small voltage and current stress, the effect of improving the voltage transfer ratio

Inactive Publication Date: 2018-02-27
JIANGSU UNIV
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  • 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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  • A kind of staggered parallel led driving circuit based on quadratic buck and its working method
  • A kind of staggered parallel led driving circuit based on quadratic buck and its working method
  • A kind of staggered parallel led driving circuit based on quadratic buck and its working method

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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] like 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 rectif...

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Abstract

The invention discloses an interleaved parallel LED drive circuit based on a quadratic Buck and its working method, belonging to the field of power electronics, including an AC input, a rectifier bridge D1, a filter inductor Lf, a filter capacitor Cf, and two switch tubes Q1 and Q2 , diodes D2, D3, D4, D5, D6, inductors L1, L2, L3 and energy storage capacitors C1, C2, output capacitor Co and LED load. Based on the existing secondary buck converter circuit topology, a switch network composed of switch tube Q2, inductor L3, capacitor C2 and diode D6 is added to form an interleaved parallel structure, which effectively reduces the output current ripple and reduces The filter inductor design reduces the volume of the converter, improves system stability and power density, and realizes high efficiency and high power factor operation.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37
Inventor 廖志凌刘康顾赟
Owner JIANGSU UNIV
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