LED adaptive constant current controller with power factor correction function

A power factor correction, flow controller technology, applied in output power conversion devices, conversion of AC power input to DC power output, energy-saving control technology, etc., can solve interference, AC input current waveform distortion, LED flickering and other problems, to achieve the effect of improving stability, improving power factor, and prolonging LED life.

Inactive Publication Date: 2010-11-10
BEIJING JIAOTONG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

This kind of resistance series current limiting method cannot guarantee a constant current flowing through the LED, and it is very likely that the LED will flicker and go dark during operation.
If the power grid suddenly outputs a large voltage, which exceeds the safe range of the current limit of the series resistor, the LED will be burned
Moreover, the number of LED loads connected in series to the constant voltage driver must be determined, and the driver cannot automatically adjust the output voltage

Method used

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  • LED adaptive constant current controller with power factor correction function
  • LED adaptive constant current controller with power factor correction function
  • LED adaptive constant current controller with power factor correction function

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Embodiment Construction

[0016] The present invention will be described in further detail below according to the accompanying drawings.

[0017] like image 3 , LED adaptive constant current controller with power factor correction includes: a power conversion module 10 , a power factor correction module 20 , and a current control module 30 .

[0018] The power conversion module 10 is composed of a rectifier bridge D31 and a filter capacitor C31. The mains AC input is converted into DC by the rectifier bridge D31, and then filtered by the filter capacitor C31 to filter out the rectified AC component.

[0019] In the power factor correction module 20, a balanced half-bridge compensation circuit is used. like figure 1 As shown, its structure is: the anode of the electrolytic capacitor C32 is connected to the cathode of the diode D32, the cathode of the electrolytic capacitor C32 is connected to the cathode of the diode D34; the anode of the diode D34 is connected to the ground; the anode of the diode D...

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Abstract

The invention discloses an LED constant current driver with a power factor correction function, wherein mains supply alternating current sequentially passes through a power supply converting module (10), a power factor correction module (20) and a current control module (30) so as to finally drive an LED array by constant current output. By utilizing a balancing half-bridge compensation circuit to carry out power factor correction, the invention effectively improves the power factor of the driver and improves power supply efficiency. The current control module provides a feedback signal through detecting the magnitude of output current, thereby regulating the duty cycle of a PWM (Pulse Width Modulation) control signal according to the feedback signal, controlling the switching time of a CMOS (Complementary Metal-Oxide-Semiconductor Transistor) power tube and enabling a ballast inductor to charge and discharge through the follow current action of a diode so as to supply constant current for an LED load. Because of the use of a power factor correction and PWM control technology, the invention has better properties of efficiency conversion and automatic regulation than the common circuit.

Description

technical field [0001] The invention belongs to a commercial power input LED lighting driver, in particular to an LED self-adaptive constant current controller with power factor correction. Background technique [0002] The inherent characteristics of LED determine that it is the most ideal light source to replace the traditional light source. First of all, LED power consumption is very low, and the photoelectric conversion efficiency is high. Under the same brightness conditions, LED consumes less power than ordinary light sources, and the heat radiation of LEDs is also much lower than ordinary light sources. Under the right current and voltage, the life of LED can reach 100,000 hours. LEDs are made of non-toxic materials, unlike fluorescent lamps that contain mercury that will cause pollution, and LEDs can also be recycled and reused. Based on various advantages of LEDs, LEDs have become the focus of the lighting field and have broad market potential. [0003] Tradition...

Claims

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Application Information

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IPC IPC(8): H05B37/02H02M7/217H02M1/12H02M1/42
CPCY02B20/42Y02B70/126Y02B20/40Y02B70/10
Inventor 魏学业班屹
Owner BEIJING JIAOTONG UNIV
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