Commercial LED illumination driver

Abstract

The invention discloses a commercial LED illumination driver. The driver comprises a rectifier module, an active quasi-resonant power factor correction module and a direct current voltage output module; wherein the input terminal of the rectifier module is connected with commercial power system, so as to rectify and filter input current; the input terminal of the active quasi-resonant power factor correction module is connected with the output terminal of the rectifier module, so as to inhibit harmonic wave produced by the LED driver and compensate the power factor; and the terminal of the direct current voltage output module is connected with the output terminal of the active quasi-resonant power factor correction module, so as to provide working voltage for LED string light. The invention applies an active power factor correction circuit working in quasi-resonant mode to LED illumination driver design and realizes substantive improvement on LED illumination driver power factor. The power factor of the LED illumination driver is improved from 0.5-0.57 to more than 0.99, harmonic wave quality index of the power system is contained in detailed design of the LED illumination design, and waveform coefficient of the LED illumination driver is improved from about 2 to below 1.2.

Description

technical field [0001] The invention relates to a driving circuit, in particular to a commercial power LED lighting driver. Background technique [0002] Electric light source lighting has experienced three generations of incandescent lamps, fluorescent lamps, and high-intensity gas discharge lamps. The light efficiency has been continuously improved, and the power consumption has been continuously reduced. The light of electricity has played a vital role in the development of human society. Today, due to the advancement of semiconductor technology, another new electric light source, LED light-emitting diode, replaces the traditional electric light source with comprehensive advantages such as energy saving, environmental protection, longevity, reliability, small size, various colors, flicker resistance, and anti-vibration. Set off the fourth revolution in the lighting industry. Many manufacturers have noticed the broad prospects of light-emitting diodes in the field of ligh...

AI Technical Summary

Problems solved by technology

At present, the research on LED lighting driver is still in its infancy, and the research focus of various manufacturers is mostly on the development of LED driver chip itself, and no complete solution has been proposed for the design of LED lighting driver.

Judging from the currently known LED lighting driver design schemes, none of them consider the overall efficiency improvement of the LED light source drive circuit, the excavation of the service life and the impact of the LED drive circuit on the quality of the power grid. The power factor compensation has not been considered when the LED light source is applied in the lighting field. Problems such as the impact of harmonics on the power grid are capacitive loads, and their power factor is only 0.5-0.57, which greatly reduces the transmission efficiency of the power grid. According to the requirements of the electrical design code for civil buildings, the power factor of electrical equipment should be above 0.85 be qualified

Since the LED drive circuit must complete the AC / DC conversion function, in order to realize the effective control of the LED working current, some electronic switching circuits and PWM pulse width regulators must be installed, so that the harmonic influence of the LED lighting driver on the power grid is very serious, and its harmonic The wave component is as high as about 110%, and the form coefficient K value is as high as 2 or more, which will cause serious high-order harmonic pollution to the power grid

In addition, when LED light sources are used in engineering applications in the field of lighting, after a period of high-brightness work, often due to serious light decay, after one year or two years at most, their actual luminous output will drop significantly, and their illuminance loss will exceed 30%. Forced to end its service life early, its actual service life is only about 5,000 hours. Although the theoretical service life of LED light sources can reach 100,000 hours, due to improper use of LED chips, its actual service life is far from the expected value

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