單級(jí)PFC反激式LED驅(qū)動(dòng)控制環(huán)路的研究與設(shè)計(jì)
[Abstract]:After the plight of Greenhouse Effect and the scarcity of earth resources, low carbon green environment has become an irreversible trend of energy development. In the field of lighting, researchers continue to pursue the limits of technology, light-emitting diode (LED) has been applied successfully in the daily lighting environment. As a kind of solid light source, LED lighting has a very long life, because of its green energy saving and environmental protection. The use of safe, reliable and flexible design will gradually replace the past generation of light sources to become the leader in the field of lighting. After more than ten years of continuous development, LED driver technology as a key link of LED lighting from the beginning of the immature leapfrogging to today's universal application, the current LED driver control towards simplification, functionalization and other directions. The universality of lighting demand indicates that its base number in application is enormous, and at the same time, the threshold of electrical equipment in the international or national harmonic standards is becoming lower and lower. LED lighting equipment with power factor correction (PFC) is undoubtedly of great practical value. In this paper, a single-stage PFC flyback LED drive control loop is studied and analyzed. The circuit uses the topology of flyback converter and uses the voltage following control technology to realize the function of power factor correction (PFC). The output current is stabilized by adjusting the switching MOSFET on time by the voltage error comparator. In other auxiliary technologies, the feedback control loop is realized by using the original side feedback technique as reference. And quasi-resonant detection technology to achieve switching MOSFET soft switching improved the efficiency of energy use. In this paper, the basic principle of single-stage PFC implementation is analyzed, and the theoretical basis of single-stage PFC flyback LED drive loop realization is studied based on the circuit frame. For each main link of the control loop, the inductance current sampling, voltage preprocessing, voltage error amplifier, on-time modulation are designed. The circuit modules of inductance current drop time detection and quasi resonance detection are simulated and analyzed respectively. Finally, the whole system circuit which is connected by the above main modules is simulated and verified by HSPICE tool. The harmonic distortion rate of the circuit meets the requirements of harmonic standard, and the power factor correction reaches 0.9, which meets the basic requirements of application.
【學(xué)位授予單位】:電子科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:TM46;TM923.34
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