Electrolytic-capacitor-free single-stage low-ripple step-down LED drive circuit and control method

A technology of LED drive and electrolytic capacitor, which is applied in the direction of control/regulation system, high-efficiency power electronic conversion, electrical components, etc., can solve the problems of reducing LED drive life and affecting optical characteristics, so as to eliminate secondary power frequency ripple and realize Effect of power factor, high-efficiency power conversion

Pending Publication Date: 2022-04-12
FUZHOU UNIV
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Problems solved by technology

But its output has a large double power frequency ripple, especially for LED loads, a small voltage ripple will generate a large current ripple, which will affect the optical characteristics
If a large electrolytic capacitor is used to reduce the power frequency ripple, it will greatly reduce the life of the LED driver

Method used

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  • Electrolytic-capacitor-free single-stage low-ripple step-down LED drive circuit and control method
  • Electrolytic-capacitor-free single-stage low-ripple step-down LED drive circuit and control method
  • Electrolytic-capacitor-free single-stage low-ripple step-down LED drive circuit and control method

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[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0022] It should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit exemplary embodiments according to the present application; as used herein, unless the context clearly indicates otherwise, the singular form is also intended to include In addition, it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, it indicates the presence of features, steps, operations, means, components and / or combinatio...

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Abstract

The invention provides an electrolytic-capacitor-free single-stage low-ripple step-down LED drive circuit and a control method. The electrolytic-capacitor-free single-stage low-ripple step-down LED drive circuit comprises a rectification unit, a step-down Cuk circuit unit with a coupling inductor and an auxiliary synchronous rectification Boost circuit unit. The output of the rectification unit is connected with the input of the voltage reduction Cuk circuit unit with the coupling inductor; the step-down Cuk circuit unit with the coupling inductor and the auxiliary synchronous rectification Boost circuit unit are integrated into a single-stage circuit through a reverse coupling inductor; two ends of the LED lamp load are respectively connected with an output capacitor of the coupled inductor voltage reduction Cuk circuit unit and connected with the auxiliary synchronous rectification Boost circuit unit in series; by applying the technical scheme, the driving control without the electrolytic capacitor can be realized. An electrolytic capacitor is eliminated, and the functions of high power factor, high conversion efficiency, low output power frequency ripple, constant current output and the like are realized.

Description

technical field [0001] The invention relates to the technical field of LED lighting driving, in particular to a non-electrolytic capacitor single-stage low-ripple step-down LED driving circuit and a control method. Background technique [0002] Light Emitting Diode (LED) is the fourth-generation lighting source after incandescent lamps, fluorescent lamps and high-intensity discharge lamps. electrical energy. LED is a cold light source driven by constant current, and its performance is restricted by the conditions of use and the performance of the driver. Single-stage power factor correction has been widely used because of its few components, low cost and high efficiency. But its output has a larger ripple of twice the power frequency, especially for LED loads, a small voltage ripple will generate a larger current ripple, which will affect the optical characteristics. If a large electrolytic capacitor is used to reduce the power frequency ripple, the life of the LED driver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B45/30H05B45/36H05B45/375H05B45/40H02M3/158H02M3/00H02M1/42H02M1/088
CPCY02B20/30Y02B70/10
Inventor 林维明许志钬孙伟杰
Owner FUZHOU UNIV
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