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Dimming drive circuit of AC (Alternating Current) direct drive LED module

A dimming drive, LED light source technology, applied in the direction of electric light circuit layout, electric light source, electroluminescent light source, etc., can solve the problems of luminous flicker and low LED luminous efficiency, achieve low cost, small size, and enhance anti-electromagnetic disturbance. the effect of the ability

Active Publication Date: 2013-01-23
四川能投智慧光电有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This kind of circuit makes the luminous efficiency of LED very low, and when the AC voltage fluctuates, there will be a phenomenon of luminous flickering

Method used

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  • Dimming drive circuit of AC (Alternating Current) direct drive LED module
  • Dimming drive circuit of AC (Alternating Current) direct drive LED module
  • Dimming drive circuit of AC (Alternating Current) direct drive LED module

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Embodiment Construction

[0058] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many of the details listed in the specification are only for readers to have a thorough understanding of one or more aspects of the present invention, and these aspects of the present invention can be implemented even without these specific details.

[0059] figure 1 A schematic diagram showing the principle of an AC dimming drive circuit for LEDs according to an embodiment of the present invention. Such as figure 1 As shown, the AC dimming driving circuit includes a rectifying unit 12 , a first voltage sampling unit 14 , a first switching unit 16 and a first LED light source module 18 . The rectification unit 12 includes four diodes, and the four diodes form a bridge rectification circuit. Alternatively, t...

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Abstract

The invention discloses an AC (Alternating Current) dimming drive circuit for an LED (Light-Emitting Diode). The AC dimming drive circuit comprises a rectification unit and N levels of LED DC (Direct Current) drive circuits, wherein in the ith-level LED DC drive circuit, a first end of an ith voltage sampling unit and the input end of an ith LED light source module directly or indirectly receive the output voltages of the rectification unit; the voltage diving end of the ith voltage sampling unit is connected with a second input end of an ith switching unit; a first input end of the ith switching unit is connected with the output end of the ith LED light source module; the output end of the ith switching unit, a second end of the ith voltage sampling unit and a second output end of the rectification unit are grounded; when the ith switching unit is switched on, the first to ith LED light source modules emit light; and when the ith switching unit is switched off, if i is less than N, the first to (i+1)th LED light source modules emit light, and if i is equal to N, the first to Nth LED light source modules stop emitting light. By utilizing the dimming drive circuit, the AC direct drive LED light source module is realized and cannot twinkle when the AC voltage fluctuates.

Description

technical field [0001] The present invention generally relates to a driving circuit for LED light source modules, in particular to a circuit for directly driving LED light source modules with alternating current, especially to an LED dimming driving circuit compatible with thyristor dimmers . Background technique [0002] As a new type of solid-state light source, LED is expected to become a new generation of lighting source due to its advantages of energy saving, environmental protection and long life. As we all know, LED is driven by DC voltage, but our production and living electricity is AC cycle power. Therefore, in order to light up the LED normally, a power converter is needed to realize the functions of rectification and step-down. The introduction of power converters brings many negative effects. First, the life of the power converter is much lower than the life of the LED itself, which shortens the life of the light-emitting device; second, the power converter w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H05B44/00
CPCY02B20/42H05B33/083H05B45/44H05B45/48H05B45/10H05B47/20H05B45/59H05B47/00
Inventor 李东明龙文涛封正勇杨冕
Owner 四川能投智慧光电有限公司
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