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LED module, LED drive circuit and drive method

A technology of LED modules and circuits, which is applied to the layout of electric lamp circuits, electric light sources, lighting devices, etc., can solve problems such as fluctuations, and achieve good consistency and stability

Active Publication Date: 2014-03-05
ZHEJIANG SHENGHUI LIGHTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, if a general NPN transistor is used for control, since the threshold voltage of the base of the second transistor 13 is greatly affected by temperature, the current flowing through the LED will vary greatly with the temperature of the transistor. fluctuation

Method used

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  • LED module, LED drive circuit and drive method
  • LED module, LED drive circuit and drive method
  • LED module, LED drive circuit and drive method

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Embodiment

[0017] Example: figure 2 It is a structural block diagram of the LED drive circuit of the present invention, image 3 It is the LED module circuit diagram in the LED drive circuit of the present invention, as figure 2 and image 3 As shown, the LED driving circuit of the present invention includes an AC power supply 1, a filter unit 2, a rectification unit 3, a transformer unit 4 connected to the rectification unit 3, a flyback conversion unit 5, a transistor switch 6, a color control unit 7 and a color control unit 7 connected LED modules. The transformer unit 4 includes a primary and a secondary. The AC power supply 1 inputs AC alternating current, and obtains a DC voltage after passing through the filtering unit 2 and the rectifying unit 3. The flyback conversion unit 5 controls the transistor switch 6, thereby controlling the output to the transformer unit 4 times The level of the voltage on the capacitor 9 of the first stage, in order to achieve the purpose of contro...

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PUM

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Abstract

The invention discloses an LED module, an LED drive circuit and a drive method. The LED module comprises a first field-effect tube, a second field-effect tube, a resistor and an LED, wherein the first field-effect tube and the second field-effect tube are connected with the resistor and the LED. The two field-effect tubes are N type field-effect tubes. The grid electrode of the first field-effect tube is connected with the source electrode of the second field-effect tube. The drain electrode of the first field-effect tube is connected with the grid electrode of the second field-effect tube. The grid electrode of the second field-effect tube and the drain electrode of the first field-effect tube receive PWM signals. The LED is connected with the drain electrode of the second field-effect tube. One end of the resistor is connected with the grid electrode of the first field-effect tube and the source electrode of the second field-effect tube and the other end of the resistor is connected to the ground. Compared with the prior art, the field-effect tubes are used for replacing NPN transistors, influences on drive voltage threshold values of the field-effect tubes by the temperature are much less than those on the drive voltage threshold values of the NPN transistors. Thus, consistence and stability of limited LED currents are better and the currents flowing by the LED are kept constant under all temperature states.

Description

technical field [0001] The invention relates to the technical field of LED lighting, in particular to an LED module, an LED driving circuit and a driving method. Background technique [0002] Due to the advantages of energy saving, environmental protection, light control, solidification, and long life, LEDs have been widely used in various lighting fields today when low-carbon life is advocated. [0003] figure 1 Shown is a traditional LED current control circuit. The PWM signal controls the turn-on and turn-off of the first transistor 11 to control the current flowing through the LED. The resistor 12 cooperates with the second transistor 13 to affect the strength of the PWM signal. Thus, the conduction degree of the first transistor 11 , that is, the flowing current, that is, the magnitude of the current flowing through the LED is determined. [0004] However, if a general NPN transistor is used for control, since the threshold voltage of the base of the second transistor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 金昌洲万叶华沈锦祥
Owner ZHEJIANG SHENGHUI LIGHTING