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Power factor correction method for LED (light-emitting diode) lighting

A power factor correction and LED lighting technology, which is applied in lighting devices, output power conversion devices, light sources, etc., can solve problems such as lack of independent research and development capabilities, blind investment, and lack of industry standards, so as to alleviate heat dissipation problems and improve LED life. , the effect of high conversion efficiency

Inactive Publication Date: 2012-06-13
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0005] However, while the LED lighting industry is developing rapidly, there are still problems such as lack of independent research and development capabilities, lack of industry standards, serious product homogeneity, and blind investment. How to improve reliability and extend the life of bulbs has become an important research in the field of LED lighting. content

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  • Power factor correction method for LED (light-emitting diode) lighting
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  • Power factor correction method for LED (light-emitting diode) lighting

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Embodiment Construction

[0027] Power Factor Correction (PFC) refers to the relationship between effective power and total power consumption (apparent power), that is, the ratio of effective power divided by total power consumption (apparent power). Basically, the power factor can measure the degree to which electricity is effectively utilized. When the value of the power factor is larger, it means that the power utilization rate is higher.

[0028] Currently, the active power factor correction technology used in the field of LED lighting adopts two schemes of working in a discontinuous conduction mode (Discontinuous Conduction Mode, DCM) or a critical conduction mode (Critical Mode, CRM).

[0029] The working frequency of the DCM control mode is constant, and the current passing through the inductor is a high-frequency triangular wave. When the inductor current drops to zero, the switch VT is not turned on immediately, resulting in a dead zone where the inductor current is zero and does not flow conti...

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Abstract

The invention discloses a power factor correction method for LED (light-emitting diode) lighting, which adopts an average current control mode in a CCM (continuous conduction mode). The method comprises the following steps that: after an input alternating voltage is rectified, the rectified voltage is converted into a first current signal (IAC) by a resistor (RAC); the waveform of the first current signal (IAC) is the envelope of the input rectified voltage, the signal and a detection current (ISENSE) of an inductor are superposed, and after the superposed current is corrected, a second current signal (I) is outputted, and the second current signal (I) is used as an input end of an operation module; and an input-end predicted voltage signal (VRMS) obtained by scaling down in equal proportion and filtering an average value of input voltages is taken as an input end of the operation module.

Description

technical field [0001] The invention belongs to the field of solid-state lighting sources, and more specifically relates to the field of LED lighting. Background technique [0002] As a solid-state lighting source, high-brightness LED is characterized by its long life, environmental protection, low power consumption, high luminous efficiency, multi-color light, dimmable light, quick response, continuous switching and flashing, and can work under safe low voltage, etc. Advantages, gradually moving towards the direction of becoming a new generation of lighting sources, known as the fourth generation of lighting sources. The application of LEDs has ranged from the initial indicator lights to traffic signals and large-screen displays in recent years. At present, they are increasingly used in functional lighting fields such as landscape lighting, road lighting and tunnel lighting. [0003] From a foreign point of view, the United States has always been in a leading position in t...

Claims

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Application Information

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IPC IPC(8): H05B37/02H02M1/42
CPCY02B70/126Y02B70/10
Inventor 姜岩峰赵帆
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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