Strobe-free alternating current drive LED light source dimming system and method thereof

An LED light source, AC drive technology, applied in light sources, electric light sources, lighting devices, etc., can solve the problems of unstable power chip operation, LED stroboscopic, low signal-to-noise ratio, etc., and achieve the effect of overcoming stroboscopic and EMI problems.

Active Publication Date: 2013-05-22
SHANGHAI YAMING LIGHTING
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Problems solved by technology

The resulting risk is: the control signal sent from the outside adjusts the reference level of the chip to a very low level, which will cause the power chip to work unstable due to the low signal-to-noise ratio, resulting in LED strobe
[0007] Therefore, there is a need for an

Method used

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  • Strobe-free alternating current drive LED light source dimming system and method thereof
  • Strobe-free alternating current drive LED light source dimming system and method thereof
  • Strobe-free alternating current drive LED light source dimming system and method thereof

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Embodiment Construction

[0022] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0023] It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of ​​the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbitrarily during actual impleme...

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Abstract

The invention provides a strobe-free alternating current drive LED light source dimming system and a method thereof. The system comprises a rectifying module, an LED array, a switch module, a sampling module, a drive power supply chip and a voltage-controlled current source module. The rectifying module is used for rectifying received alternating current and outputting work voltage. The LED array comprises multi-stage lamp groups divided according to progressive increasing number of serially-connected LEDs. The switch module comprises a plurality of switches correspondingly connected to an output end of each stage of lamp groups, and the switches are used for communicating and cutting off a power supply circuit of each stage of lamp groups. The sampling module comprises multi-stage sampling resistor strings according to progressive decreasing number of serially-connected resistors. The drive power supply chip is used for providing a standard level for the power supply circuit of each stage of lamp groups. The voltage-controlled current source module is used for generating a direct current level in a preset range according a lighting control signal output by a light control center, and the direct current lever generates bias current to modulate amplitude and dim an LED light source. LED current can be changed by changing external bias current according to the control signal, and strobe-free deep dimming can be achieved.

Description

technical field [0001] The invention relates to an LED light source dimming system and method, in particular to a flicker-free AC-driven LED light source dimming system and method. Background technique [0002] At present, the main obstacle for LED lighting technology to be widely accepted by the market is the price of LED lighting systems. According to the results of cost comparison and service life analysis, compared with LED lighting systems driven by switching power supplies, AC-driven LED lighting systems have obvious advantages in terms of price and life. It is a very powerful measure to increase the price of lighting products and promote the application of LED lighting. [0003] In LED lighting control, how the drive power supply recognizes the received control signal, how the power supply responds to the control signal and realizes the change of output power (dimming) is closely related to the topology of the LED power supply, so the dimming control technology of AC...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 曹箫洪
Owner SHANGHAI YAMING LIGHTING
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