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Design method for light-emitting diode lamp directly driven by AC

An AC direct drive, light-emitting diode technology, applied in the direction of light source, electric light source, electric lamp circuit layout, etc., can solve the problems of short LED conduction time, large harmonic distortion, low utilization rate, etc., and achieve the conduction time and utilization rate. High, low harmonic distortion, high power factor effect

Inactive Publication Date: 2014-03-26
BEIJING JILE ELECTRONICS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are large harmonic distortion, small power factor, and high cost
The general AC direct drive, although low in cost and high in power factor, has large harmonic distortion, and the LED conduction time is short and the utilization rate is low.

Method used

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  • Design method for light-emitting diode lamp directly driven by AC
  • Design method for light-emitting diode lamp directly driven by AC
  • Design method for light-emitting diode lamp directly driven by AC

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Embodiment Construction

[0015] In the following embodiment, the design method of the LED lamp directly driven by the AC includes the following steps:

[0016] Step 1. First, determine the total number of low-power LEDs required according to the total power of the lamp.

[0017] Step 2. Combine figure 1 , and then divide the LEDs into groups based on the total number of LEDs determined in step 1. exist figure 1 In the shown embodiment, the LEDs are divided into 4 groups, namely, N1 group, N2 group, N3 group, and N4 group; each group of N1, N2, N3, and N4 has 20 low-power LEDs.

[0018] Step 3, see figure 2 , combined with the following Table 1 and figure 1 , according to the sine wave time-sharing voltage, corresponding to the grouping in step 2, determine the on and off time of each group of LEDs according to the instantaneous voltage judgment.

[0019] Step 4. According to the turn-on and turn-off time of each group of LEDs determined in step 3, set the judgment condition of the sequential on-...

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Abstract

The invention discloses a design method for a light-emitting diode lamp directly driven by AC. The method comprises the following steps: 1. firstly determining the total number of low-power LEDs required by the lamp; 2. according to the total number of the LEDs determined in step 1, dividing the LEDs into a plurality of groups; 3. according to a sine-wave time-sharing voltage, and determining the switching on / off time of each group of LEDs according to the groups in step 2; 4. according to the switching on / off time of each group determined in step 3, setting a judgment condition of a sequential switching on / off function IC, and designing a corresponding sequential switching on / off function IC module; 5. designing a wiring diagram of the lamp according to the technical conditions determined in the steps. On the basis that the lamp is directly driven by AC, the method disclosed by the invention enables the LEDs to be switched on in a time-sharing and grouping mode, and therefore, the characteristics of low cost and high power factors are achieved. In addition, the harmonic distortion is low, thereby increasing the switching on time and utilization rate of LEDs.

Description

technical field [0001] The invention relates to the field of light emitting diodes, in particular to a design method of an AC directly driven light emitting diode (LED) lamp. Background technique [0002] At present, most LED lamps use switching power supply to convert the mains AC 220V to DC, and then add a constant current control circuit to drive the LED. The main disadvantages of this method are large harmonic distortion, low power factor, and high cost. However, the general AC direct drive has low cost and high power factor, but the harmonic distortion is also large, and the LED conduction time is short, and the utilization rate is low. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a design method of an AC direct-driven light-emitting diode lamp, which has low cost, high power factor, and small harmonic distortion, and improves LED turn-on time and utilization rate. [0004] In order to solve the above-m...

Claims

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Application Information

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IPC IPC(8): H05B37/02
CPCY02B20/42Y02B20/40
Inventor 张木荣王玉春傅希全
Owner BEIJING JILE ELECTRONICS GROUP