Method for improving quality of light-emitting diode (LED) drive circuit and LED drive circuit

An LED driver and circuit technology, applied in the direction of electric lamp circuit layout, electric light source, lighting device, etc., can solve the problems of the adverse effect of the post-stage circuit, the output voltage ripple is too large, and it is difficult to filter out small capacitors, so as to improve the overall performance. Quality, extended service life, stable lighting effect

Active Publication Date: 2011-05-04
贵州煜立电子科技有限公司
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Problems solved by technology

Due to the phase shift and current waveform distortion generated by the rectifier filter circuit, the power factor drops; no capacitor filter, or the use of the existing reactive power compensation circuit, although the power factor can be improved, but the output voltage (current) ripple provided is very

Method used

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  • Method for improving quality of light-emitting diode (LED) drive circuit and LED drive circuit
  • Method for improving quality of light-emitting diode (LED) drive circuit and LED drive circuit
  • Method for improving quality of light-emitting diode (LED) drive circuit and LED drive circuit

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[0026] The following describes the present invention in further detail with reference to the accompanying drawings and embodiments, but it is not intended as any limitation to the present invention.

[0027] Examples. The invention is like figure 1 with figure 2 Shown. A method for improving the quality of the LED driving circuit, which uses an active filter circuit composed of two-terminal constant current devices as the filter circuit of the LED driving circuit to improve the quality of the LED driving circuit. The two-terminal constant current device adopts a CRD constant current diode. image 3 Is the characteristic curve of CRD constant current diode, which is determined by image 3 It can be seen that the constant current diode is a constant current device at both ends. There is a constant current area when working in the forward direction, in this area, the current I does not change with V; its reverse working characteristics are similar to those of ordinary diodes. W...

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Abstract

The invention discloses a method for improving quality of a light-emitting diode (LED) drive circuit and the LED drive circuit. In the method, an active filter circuit composed of two-terminal constant current regulators is taken as the filter circuit of the LED drive circuit so as to improve the quality of the LED drive circuit. The structure of the LED drive circuit comprises a full-wave rectifier circuit, and the full-wave rectifier circuit is connected with the active filter circuit which takes a current regulative diode (CRD) as a main body. The LED drive circuit has a simple circuit structure and is directly powered by a mains supply of 220V (110V)/50HZ/60HZ, and can lead an LED to emit light more stably and prolong the service life of the LED, thus overcoming the defects such as low power factor, low drive efficiency, difficult control of constant current errors, complicated circuit structure and the like in the prior art.

Description

technical field [0001] The invention relates to a method for improving the quality of an LED driving circuit and the LED driving circuit, and belongs to the application technical field of novel constant current diodes. Background technique [0002] Current LED drive circuits are generally powered by DC power sources in various ways, and all grid power supply methods require rectification and filtering circuits. Due to the phase shift and current waveform distortion generated by the rectifier filter circuit, the power factor drops; no capacitor filter, or the use of the existing reactive power compensation circuit, although the power factor can be improved, but the output voltage (current) ripple provided is very large , The ripple coefficient reaches 50%--70%. These ripples are low-frequency ripples (50HZ-100HZ) that are the same as the frequency of the AC power supply, and it is difficult to filter them out with small capacitors. The output voltage ripple is too large, whi...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 刘桥
Owner 贵州煜立电子科技有限公司
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