WLED (White Light Emitting Diode) driving circuit and method suitable for triode-thyristor light modulator

A technology of driving circuit and driving method, which is applied in the direction of electric lamp circuit arrangement, light source, electric light source, etc., can solve the problem of flickering in the dimming process

Active Publication Date: 2011-06-01
CHENGDU MONOLITHIC POWER SYST
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  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of flickering in the dimming process of the existing triac dimmer due to the presence of low-frequency alternating current, and to provide a WLED driving method and drive cir...

Method used

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  • WLED (White Light Emitting Diode) driving circuit and method suitable for triode-thyristor light modulator
  • WLED (White Light Emitting Diode) driving circuit and method suitable for triode-thyristor light modulator
  • WLED (White Light Emitting Diode) driving circuit and method suitable for triode-thyristor light modulator

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Embodiment Construction

[0066] The triac dimming WLED driving method and driving circuit according to the embodiments of the present invention will be described in detail below. In the following description, some specific details, such as specific circuit structures in the embodiments and specific parameters of these circuit elements, are used to provide a better understanding of the embodiments of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without many of the details or other combinations of methods, elements, materials, etc.

[0067] figure 2 It is a schematic diagram of a triac dimming WLED driving circuit according to an embodiment of the present invention. The driving circuit 200 mainly includes a triac dimmer 202 , an electronic transformer 204 and a WLED driver 206 for driving a WLED lamp 208 . in:

[0068] The triac dimmer 202 is used to receive a high-voltage AC power supply voltage U1 and generate a high-voltage A...

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Abstract

The invention discloses a WLED (White Light Emitting Diode) driving circuit and method suitable for a triode-thyristor light modulator. In the driving circuit and method, a novel electronic transformer is provided and can be used for detecting the conduction angle of high-voltage alternating current output by the triode-thyristor light modulator and converting the high-voltage alternating currentinto PWM (Pulse-Width Modulation) low-voltage direct current with a duty cycle regulated by the conduction angle. The PWM low-voltage direct current supplies power to a WLED driver so as to drive a WLED to work; and the triode-thyristor light modulator can be regulated to regulate average current flowing through the WLED so as to change the brightness of the WLED. The PWM low-voltage direct current contains no alternating-current voltage ripples with the frequency of 50Hz and below, and thus, the WLED driving circuit and method suitable for the triode-thyristor light modulator successfully realize the smooth flicker-free light modulation for the WLED.

Description

technical field [0001] The invention relates to a driving method and a driving circuit of an LED, in particular to a driving method and a driving circuit of a triac dimmer suitable for a WLED (white light LED). Background technique [0002] Nowadays, the application of WLED lighting technology has become more and more extensive, and replacing traditional bulb lighting with WLED has become a major trend in the development of WLED lighting technology. However, one of the difficulties in using WLEDs to replace traditional bulb lighting is that the WLED drive circuit must be compatible with standard triac dimmers to adjust the brightness of WLEDs during lighting. service life. [0003] Traditional triac dimmers are designed for purely resistive load lamps, such as incandescent lamps and iodine-tungsten lamps. Because WLEDs do not exhibit resistive load characteristics, it is not possible to achieve good results in dimming WLEDs using traditional triac dimmers. Such as figure...

Claims

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Application Information

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IPC IPC(8): H05B37/02
CPCH05B37/0263H05B47/185
Inventor 黄勇杜磊任远程张军明
Owner CHENGDU MONOLITHIC POWER SYST
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