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Primary control LED driving circuit based on SEPIC and Fly-back circuits

A technology of LED driving and primary side control, applied in electric light sources, electrical components, electroluminescent light sources, etc., can solve the problems of low power density, reduced working life and control accuracy of the system, and low reliability of the LED driver system. , to reduce the switching loss

Active Publication Date: 2017-02-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of low reliability of the traditional LED driver system, low overall power density of the system, and the use of optocouplers to reduce the working life of the system and the accuracy of control, and now provides primary side control based on SEPIC and Flyback circuits LED drive circuit

Method used

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  • Primary control LED driving circuit based on SEPIC and Fly-back circuits
  • Primary control LED driving circuit based on SEPIC and Fly-back circuits
  • Primary control LED driving circuit based on SEPIC and Fly-back circuits

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specific Embodiment approach 1

[0040] Embodiment 1: In the primary side control LED drive circuit based on SEPIC and Flyback circuit described in this embodiment, the 220V AC mains input circuit is electrically connected to the SEPIC circuit, the SEPIC circuit is electrically connected to the Flyback converter circuit, and the Flyback converter circuit Connect with the LED electrical appliances to be driven,

[0041] The SEPIC circuit is used for the power factor correction of the front stage,

[0042] The Flyback converter circuit is used to realize primary side control.

[0043] SEPIC circuit (single ended primary inductor converter, DC-DC converter that allows the output voltage to be greater than, less than or equal to the input voltage), in the circuit design stage, limits the input current ripple, so the low voltage at the input end of the circuit can be omitted. pass filter circuit. At the same time, the SEPIC circuit has the characteristics of step-up and step-down, which can be more flexible for ...

specific Embodiment approach 2

[0045] Specific implementation mode two: refer to figure 1 Describe this embodiment in detail. This embodiment is a further description of the primary side control LED drive circuit based on SEPIC and Flyback circuits described in the first specific embodiment. In this embodiment, the primary side control LED drive circuit includes: a diode D. 1 , Diode D 2, Diode D 3 , Diode D 4 , capacitance C 0 , inductance L 1 , Diode D 5 , capacitance C 1 , inductance L 2 , Diode D 6 , Bus capacitance C 3 , inductance L p , Transformer T 1 , Diode D 7 , inductance L leak , output capacitance C 4 , switch tube Q and resistor R cs ;

[0046] Diode D 1 The cathode of the diode D 2 negative pole, capacitor C 0 one end and the inductance L 1 connected at one end,

[0047] Diode D 3 Anode, diode D 4 positive electrode and capacitor C 0 The other end is connected to the power ground at the same time,

[0048] Diode D 1 the anode of the diode D 3 connected to the catho...

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Abstract

A primary control LED driving circuit based on SEPIC and Fly-back circuits relates to the field of LED driving circuits. The invention aims to solve the problem that the traditional LED driver system is of low reliability and low overall power density and an optical coupler adopted reduces the working life of the system and the control accuracy. According to the primary control LED driving circuit based on SEPIC and Fly-back circuits of the invention, a 220V AC mains input circuit is electrically connected with an SEPIC circuit, the SEPIC circuit is electrically connected with a Fly-back converter circuit, the Fly-back converter circuit is electrically connected with a to-be-driven LED electric appliance, the SEPIC circuit is used for front-stage power factor correction, and the Fly-back converter circuit is used for realizing primary control. The primary control LED driving circuit based on SEPIC and Fly-back circuits of the invention is used for driving LEDs.

Description

technical field [0001] The invention belongs to the field of LED drive circuits. Background technique [0002] LEDs have been widely used in street lighting, indoor lighting, LCD backlighting and other fields because of their long service life, no pollution to the environment, pure light color and high work efficiency. With the continuous maturity of LED packaging technology, LEDs have shown a tendency to replace fluorescent lighting. According to the characteristics of LED constant current drive, more and more researchers have paid more and more attention to efficient and stable LED drive circuits. At present, there are mainly the following problems: [0003] 1. The traditional LED driver generally includes two-stage structure: the front stage is a power factor correction unit, which is used to improve the power factor and reduce the total harmonic factor, reduce the interference to the power grid, and meet the requirements of IEC61000 and Energy Star standards for LED li...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/40H05B45/37Y02B20/30
Inventor 王懿杰张树管乐诗邱玉萍张相军刘晓胜徐殿国
Owner HARBIN INST OF TECH
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