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Single-stage AC-DC (alternating current-direct current) high-power LED (light-emitting diode) lighting drive circuit

An LED driving, high-power technology, applied in lighting devices, lamp circuit layout, output power conversion devices, etc., can solve the problems of many LED driving circuit devices, short life, high cost, avoid adverse effects, and small capacitance. , the effect of low power factor harmonics

Inactive Publication Date: 2012-06-20
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to construct a single-stage AC / DC high-power LED lighting drive circuit with a new topology, and overcome the technical problems of many LED drive circuit components, high cost and short life in the prior art

Method used

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  • Single-stage AC-DC (alternating current-direct current) high-power LED (light-emitting diode) lighting drive circuit
  • Single-stage AC-DC (alternating current-direct current) high-power LED (light-emitting diode) lighting drive circuit
  • Single-stage AC-DC (alternating current-direct current) high-power LED (light-emitting diode) lighting drive circuit

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Embodiment approach

[0022] Such as image 3 As shown, it is a specific implementation of simple open-loop control of the present invention, and the specific implementation is as follows: image 3 The main circuit and figure 1 The main circuit is exactly the same, and its basic composition and working process are also the same as figure 1 The circuits are the same, and the main difference is that an implementation circuit of the control circuit of the LED driver is specifically shown. Therefore, the following mainly introduces the composition, specific implementation and working process of the control circuit.

[0023] The control circuit uses the IR2153 chip as the core, which generates a high-frequency square wave control pulse with a duty cycle of 50% and a phase difference of 180°, and sends it to the power switch tube S 1 , S 2 gate pole. The specific composition of the control circuit includes the resistance R 1 , the Zener diode VD, the capacitor C v1 and C v2 , the integrated circu...

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Abstract

The invention relates to a design of a single-stage AC / DC (alternating current-direct current) high-power LED (light-emitting diode) lighting driver. A PFC (power factor correction) circuit with bridgeless boost topology and a half-bridge resonant LLC (logical link control) circuit are organically combined, and the functions of outputting pulse current to drive an LED for lighting, soft-switching a power switching tube and realizing high power factor and low harmonic of input current of a power grid by sharing the power switching tube and a small-capacitance capacitor device, and the driver can simultaneously reduce the number of power devices, reduce the cost of the driver and improve the reliability of the driver. The switching tube in the driver disclosed by the invention works under the conditions of high frequency and fixed duty ratio, and a control circuit is simple. The driver disclosed by the invention can eliminate a large-capacitance electrolytic capacitor on the DC side of the traditional PFC circuit, the capacitor in the designed circuit can be simultaneously used as a resonant capacitor of an LLC half-bridge resonant circuit, and the adverse effects of the electrolytic capacitor on the long service life of the LED can be avoided. The driver disclosed by the invention can output the low-frequency pulse current to drive an LED lamp and is applicable to the field of general lighting.

Description

technical field [0001] The invention belongs to a high-power LED lighting driver, in particular to a single-stage AC / DC high-power LED lighting driving circuit. Background technique [0002] As a new type of light source after incandescent lamps and fluorescent lamps, LED has many advantages such as high luminous efficiency, environmental protection, and long life. . Providing efficient, reliable, and low-cost drivers for LED light sources is an important prerequisite for giving full play to its aforementioned advantages. Therefore, designing an LED driver with excellent performance is an important part of LED lighting applications. At present, LED lighting powered by AC mains is one of its mainstream application fields. In order to meet the requirements of high power factor and drive stability, the LED driver usually powered by AC includes PFC and DC / DC two-stage circuits. This AC / DC structure uses many devices, large volume, and high cost. In addition, the reliability o...

Claims

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Application Information

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IPC IPC(8): H05B37/02H02M1/42
CPCY02B70/126Y02B70/10
Inventor 和军平邱贝贝
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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